Answer:
Physical changePhysical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.[1]
Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances. In general a physical change is reversible using physical means. For example, salt dissolved in water can be recovered by allowing the water to evaporate.
A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.
An example of a physical change is the process of tempering steel to form a knife blade. A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to maintain a sharp edge.
Many physical changes also involve the rearrangement of atoms most noticeably in the formation of crystals. Many chemical changes are irreversible, and many physical changes are reversible, but reversibility is not a certain criterion for classification. Although chemical changes may be recognized by an indication such as odor, color change, or production of a gas, every one of these indicators can result from physical change.
Chemical changeChemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
I hope it will help youplz mark me as brainliestplz thank my answerPhysical properties are characteristics of matter that can be observed or measured without changing the substance's chemical composition. Chemical properties, describe how a substance interacts with other substances, indicating its ability to undergo chemical reactions.
Physical properties are those that can be observed or measured without altering the chemical identity of a substance. These include characteristics such as color, density, melting point, boiling point, odor, and conductivity. For example, when you melt ice to form water, it remains H2O throughout the process, so the change in state (from solid to liquid) is a physical change. Similarly, the change in color of a metal when it's heated is also a physical property, as it doesn't alter the metal's composition.
Chemical properties, on the other hand, describe how a substance interacts with other substances and its ability to undergo chemical reactions. These properties include reactivity, flammability, toxicity, and the ability to rust or corrode. For instance, when iron rusts upon exposure to oxygen and moisture, it's undergoing a chemical change because its composition changes from pure iron (Fe) to iron oxide (Fe2O3).
In summary, physical properties involve observable characteristics that don't change a substance's composition, while chemical properties describe a substance's behavior in chemical reactions and how it can transform into different substances.
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Elements that typically give up electrons _______
Answer:
metals? I'm not 100% sure, sorry if I'm wrong.
How many atoms of hydrogen are represented in 2(NH4)2504?
A.4
B.8
C.16
D.32
Answer: C. 16
Explanation: In 2 (NH4)2SO4 the atoms of H is equal to:
H = 4x 2 = 8 x 2 = 16 atoms
What part of a cell has a function that is similar to your skin's? What is that function?
.
Explanation:
Skin Deep is developed by AAAS and funded by Neutrogena. I think
cell membrane part of a cell has a function that is similar to your skin, it protect the human body from harsh environment.
What is the function of cell membrane?The cell membrane of a cell is a thin selectively semi-permeable membrane which covers the cell by surrounding cell cytoplasm, the major component of cell membrane are protein and lipid where the major lipid is phospholipid.
The proteins are different types present in bilayer membrane such as peripheral, intrinsic and extrinsic protein; Some major organelles of the cell have cell membrane such as nucleus and mitochondria.
The function of cell membrane is to protect the cell, maintain the integrity of the internal environment, act as a base of attachment for cell to cell communication like cytoskeleton, helps in transport of nutrients into the cell and outside of the cell.
It only allows the molecules and ions maintain the specific physical/chemical properties, is a protective layer surrounding a cell, it allows waste to leave the cell.
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what is bromine classified as?
Answer:
The chemical element bromine is classed as a halogen and a nonmetal.
Explanation:
The law of conservation of mass tells us, in part, that matter is neither created nor destroyed.
How can the law of conservation of mass for a chemical reaction be expressed?
Law of conservation of mass for a chemical reaction can be expressed by all of the above.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.For a reaction to obey law of conservation of mass it must be balanced.
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Your question is incomplete, but most probably your full question was,the law of conservation of mass tells us, in part, that matter is neither created nor destroyed.How can the law of conservation of mass for a chemical reaction be expressed? A. By using using coefficients coefficients in in a chemical equation B. By writing a a balanced balanced chemical equation C. By counting the atoms present on each side of the equation D. All of of the the above
The law of conservation of mass states that in a chemical reaction, matter is neither created nor destroyed, meaning the total mass of the reactants equals the total mass of the products. Introduced by Antoine Lavoisier in 1789, this principle highlights that matter can change forms but the total mass is conserved.
The law of conservation of mass states that matter is neither created nor destroyed during a chemical reaction. This means that the total mass of the reactants (substances that undergo the changes) must be equal to the total mass of the products (substances formed as a result of the reaction). For example, when burning charcoal in oxygen, the mass of the charcoal and oxygen before the reaction is the same as the mass of the carbon dioxide, water vapor, and ash produced. Antoine Lavoisier, a French chemist, introduced this concept in 1789, emphasizing that although matter can change forms (e.g., from a solid to a gas), the total mass remains constant before and after the reaction. The rearrangement of atoms during reactions ensures the conservation of mass.
Which are made of matter?
living things only
both living and nonliving things
nonliving things only
some living and all nonliving things
Yo sup??
The correct answer is option B ie
both living and non living things.
Hope this helps
The correct answer is that both living and nonliving things are made of matter. The correct option is: both living and nonliving things.
Living organisms and inanimate objects alike are composed of matter. Essentially, matter is the "stuff" that constitutes everything in existence. Anything that occupies space and has mass qualifies as matter, which consists of various chemical substances.
Therefore, the accurate answer to the question "What is made of matter?" encompasses both living and nonliving entities. This includes everything from the air we breathe to the earth beneath our feet, the food we consume, and our own bodies.
For example, the chair you're sitting on and the meal you had for lunch are both made of matter. Matter, defined as anything that has mass and takes up space, includes all tangible objects in the universe, whether living or nonliving.
Predict the gravitational and electrostatic forces between molecules of gases? Provide evidence for your prediction.
the electrostatic forces are [tex]10^{36}[/tex] larger than the gravitational force
Explanation:
Let's do the calculation by using two molecules of hydrogen, each containing 2 atoms of hydrogen.
The gravitational force between the two molecules is given by:
[tex]F=\frac{G m_1 m_2}{r^2}[/tex]
where
[tex]G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}[/tex] is the gravitational constant
m1 and m2 are the masses of the two molecules: since they are identical,
[tex]m_1 = m_2 = 2m_p = 1.67\cdot 10^{-27} kg[/tex], twice the mass of the proton
r is the distance between the two molecules
The force can be rewritten as
[tex]F_G=\frac{Gm_p^2}{r^2}[/tex]
We can assume instead that electrostatic force between the two molecules is given by the interaction between the positively charged nuclei and the neatively charged electrons. Therefore,
[tex]F_E=\frac{kq_1 q_2}{r^2}[/tex]
where
[tex]k=8.99\cdot 10^9 Nm^{-2}C^{-2}[/tex] is the Coulomb's constant
[tex]q_1 = q_2 = 2e[/tex] is the magnitude of the charge of each molecule, where
[tex]e=1.6\cdot 10^{-19}C[/tex] is the fundamental charge
r is the distance between the two molecules
So the force can be rewritten as
[tex]F_E=\frac{ke^2}{r^2}[/tex]
Therefore, the ratio between the two forces is:
[tex]\frac{F_E}{F_G}=\frac{ke^2}{Gm_p^2}=\frac{(8.99\cdot 10^9)(1.6\cdot 10^{-19})^2}{(6.67\cdot 10^{-11})(1.67\cdot 10^{-27})^2}\sim 10^{36}[/tex]
So, the electrostatic forces are [tex]10^{36}[/tex] larger than the gravitational force.
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How many orbitals are in the n = 3 level?
Could someone explain what oxidation numbers are and what these questions are asking of me?
The oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation of an atom in a chemical compound.
Explanation:
The oxidation number of an atom is the charge that atom would have if the compound was composed of ions. 1. The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. The oxidation number of simple ions is equal to the charge on the ion.
The oxidation number of a mono atomic ion equals the charge of the ion. The oxidation number of H is +1, but it is -1 in when combined with less electro negative elements. The oxidation number of O in compounds is usually -2, but it is -1 in peroxides. The oxidation number of a Group 1 element in a compound is +1.
Which option correctly describes the enthalpy of formation?
Answer: Endothermic reaction.
Explanation: A chemical reaction in which energy is absorbed from the surrounding environment.
2 Points
Which of the following is true of tetrads?
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A. They exist throughout the process of meiosis.
O
B. They separate during meiosis I.
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C. They are found only in haploid cells.
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D. They also form in cells undergoing mitosis.
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Answer:
four times im cool.
Explanation:
The following is true of tetrads is they separate during meiosis I.
The correct option is (B).
Tetrads, also known as bivalents, are structures formed during the prophase I stage of meiosis, specifically during the crossing over process. During prophase I, homologous chromosomes pair up to form tetrads. Each tetrad consists of two homologous chromosomes, each composed of two sister chromatids. This pairing allows for the exchange of genetic material between homologous chromosomes through crossing over.
Once tetrads are formed, they undergo a process called crossing over, where segments of DNA are exchanged between the paired homologous chromosomes. This genetic recombination increases genetic diversity among the resulting gametes.
During meiosis I, tetrads align at the metaphase plate, and then homologous chromosomes separate, with one chromosome from each homologous pair moving to opposite poles of the cell. This separation occurs during the first division of meiosis, known as meiosis I. Therefore, option B, "They separate during meiosis I," is the correct statement regarding tetrads.
As for the other options:
A. Tetrads do not exist throughout the process of meiosis. They are transient structures formed during prophase I and are resolved as homologous chromosomes separate during meiosis I.
C. Tetrads are not found only in haploid cells. They are formed during meiosis, which ultimately leads to the production of haploid cells (gametes), but they themselves are formed during the diploid stage of meiosis.
D. Tetrads do not form in cells undergoing mitosis. Mitosis involves the division of a diploid cell into two identical diploid daughter cells, and it does not involve the pairing of homologous chromosomes or the formation of tetrads. Tetrads are specific to meiosis, which is a process of cell division that leads to the formation of haploid gametes for sexual reproduction.
complete question given below:
Which of the following is true of tetrads?
A. They exist throughout the process of meiosis.
B. They separate during meiosis I.
C. They are found only in haploid cells.
D. They also form in cells undergoing mitosis.
Jordan needs to repeat the experiment but his teacher says that he needs to improve his design in his second experiment what should he do different
Jordan has to include control factors including light, temperature, and nutrient levels to improve the experiment's design. He must make sure that, aside from the music exposure, the second experiment's parameters are the same for both plants.
Jordan should continue to maintain control over variables that might affect tomato development in the revised experiment. To ensure that any variations in tomato yield are mostly attributable to the music's effect, controllable variables such as light intensity, temperature, and nutrient delivery must be present.
With the exception of the music exposure, both plants should be put to the same conditions. This well designed setup will make it easier to pinpoint the precise impact of music on tomato development.
Additionally, a larger sample size with both tomato plants exposed to music and those not will yield more reliable results. Jordan will be able to make more trustworthy deductions regarding the real effects of music on plant growth in this way.
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The given question is incomplete, complete question is- "Jordan is doing a science fair project on the effects of music on the growth of tomatoes. He has two tomato plants, Plant A and Plant B, that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones attached to the soil. Throughout the growth period, Jordan counts the number of tomatoes produced by each plant.
Plant A = 35 Tomatoes | Plant B = 55 Tomatoes
Jordan needs to repeat the experiment but his teacher says that he needs to improve his design in his second experiment what should he do different?"
If you wanted to repeat your experiment, you could do it once, then do it again, and so on. You could also _____.
Answer:
You can do three experiments and take the average result.
Explanation:
Repeating an experiment establishes two things: reproduciblity and repeatability. These are two different but connected terms.
Reproducibility: This refers to the degree of agreement in the results conducted by different individuals at different locations using different instruments. The experiments are subject to many conditions such as temperature, humidity, human error, instrument error etc.
Repeatability on the other hand, is a measure of how repeatable an experiment is by using same instruments. In other words, the experiment must be replicated elsewhere and still generate the same results or close to that.
To establish the either of the two, three experiments will be sufficient. This means that for the results, there will be a lower value, middle value, and upper value.
The average result is a combination of the results and divided by the number of experiments, in this case, 3.
One advantage of doing 3 experiments is that you get a quick representative of how the results are.
Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1." C 4 H 10 + O 2 → CO 2 + H 2 O
Final answer:
To balance the chemical equation C4H10 + O2 -> CO2 + H2O, we need to put coefficients in front of the molecules so that the number of atoms of each element is the same on both sides of the equation. The balanced equation is C4H10 + 13/2 O2 -> 8 CO2 + 10 H2O.
Explanation:
To balance the chemical equation C4H10 + O2 -> CO2 + H2O, we need to make sure that the number of atoms of each element is the same on both sides of the equation.
Starting with carbon (C), we have 4 carbon atoms on the reactant side and 1 carbon atom on the product side. To balance carbon, we can put a coefficient of 2 in front of CO2, giving us 2 carbon atoms on the product side.
Next, let's look at hydrogen (H). We have 10 hydrogen atoms on the reactant side, but only 2 hydrogen atoms on the product side. To balance hydrogen, we can put a coefficient of 5 in front of H2O, giving us 10 hydrogen atoms on the product side.
Finally, let's balance oxygen (O). We have 2 oxygen atoms on the reactant side and 2 oxygen atoms in CO2, giving us a total of 4 oxygen atoms on the product side. The equation is now balanced: C4H10 + 13/2 O2 -> 8 CO2 + 10 H2O.
If the pH of a solution is 5.3, what is the pOH?
A.5.3
B.4.7
C.8.7
D.9.3
The correct answer is C) 8.7
What does pH answer mean?The pH of a solution indicates the acidity or basicity of the answer. A solution is said to be neutral if the pH is 7, if the pH fee is less than 7 then it is acidic in nature and if the pH cost is greater than 7 then the solution is simple in nature.
What does pH stand for?Ph may appear as it belongs at the periodic desk of factors, however, it's truly a unit of size. The abbreviation pH stands for ability hydrogen, and it tells us how an awful lot hydrogen is in drinks—and the way active the hydrogen ion is.
What's the pH of a solution?PH is a measure of the attention of H+(aq) ions in an answer. The attention of H+ ions may be stated in mol dm(-three), but the use of the log(10) feature simplifies the numbers concerned. Definition: pH is the terrible logarithm to base 10 of the hydrogen ion awareness in an aqueous solution.
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How can I lucid dream?
Answer:
Set an alarm for five hours after your bedtime.
Go to sleep as usual.
When the alarm goes off, stay up for 30 minutes. Enjoy a quiet activity like reading.
Fall back asleep.
Explanation:
Answer:
juice wrld jk
Explanation:
How many joules are required for melting 12.8g of ice at 0 degrees Celsius?
Answer:
4,270 Joules
Explanation:
The heat of fusion of water is 334 j/g. So, the equation would be (12.8 g)(334 j/g) which comes to 4,270 joules.
Written out that's just twelve point eight times three hundred and thirty four.
To melt 12.8g of ice at 0 degrees Celsius, one would need 4275.2 joules of energy. This is calculated by multiplying the mass of the ice (12.8g) by the heat of fusion for ice (334 J/g).
To determine how many joules are required for melting 12.8g of ice at 0 degrees Celsius, we should use the known heat of fusion for ice. The heat of fusion of ice is 334 J/g, which is the amount of energy needed to convert 1 gram of ice at its melting point into 1 gram of water at the same temperature without changing its temperature.
The calculation is straightforward:
First, find the energy required to melt a single gram of ice which is 334 J/g.Multiply this value by the mass of the ice in grams to find the total energy required.In this case:
Energy required = 334 J/g × 12.8 g = 4275.2 J
Therefore, 4275.2 joules of energy are required to melt 12.8g of ice at 0 degrees Celsius.
What is the name for NH
Answer:
Due to the lack of context for your question I’m not completely sure which you are talking about but NH can be Imidogen or it could be ammonium which is NH4^1+
The chemical formula NH is incomplete and cannot be accurately named without identifying the number of hydrogen atoms present. A common compound with nitrogen and hydrogen is NH3, known as ammonia.
Explanation:The name for NH is not complete since the chemical formula appears to be missing a part. Typically, we would expect a numeral after the hydrogen (H) to denote how many hydrogen atoms are present, as in NH3, which is called ammonia. However, if N is intended to represent nitrogen and H represents hydrogen, then we would be dealing with a molecule composed of these elements. A fully correct chemical formula is required for a proper naming.
Magnetism easily separates what mixture?
A). Sand and glass
B). Sand and iron
C). Sand and clay
D). Sand and aluminum
Answer:
im pretty sure its b. sand and iron
ik that magnetism easily separates iron
How many grams of zinc would be required to produce 9.65g of zinc hydroxide
The question is incomplete, here is the complete question:
How many grams of zinc would be required to produce 9.65g of zinc hydroxide
Zn+2MnO₂+H₂O→Zn(OH)₂+Mn₂O₃
Answer: The mass of zinc required is 6.35 grams
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Given mass of zinc hydroxide = 9.65 g
Molar mass of zinc hydroxide = 99.4 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of zinc hydroxide}=\frac{9.65g}{99.4g/mol}=0.0971mol[/tex]
The given chemical equation follows:
[tex]Zn+2MnO_2+H_2O\rightarrow Zn(OH)_2+Mn_2O_3[/tex]
By Stoichiometry of the reaction:
1 mole of zinc hydroxide is produced from 1 mole of zinc
So, 0.0971 moles of zinc hydroxide will be produced from = [tex]\frac{1}{1}\times 0.0971=0.0971mol[/tex] of zinc
Now, calculating the mass of zinc from equation 1, we get:
Molar mass of zinc = 65.4 g/mol
Moles of zinc = 0.0971 moles
Putting values in equation 1, we get:
[tex]0.0971mol=\frac{\text{Mass of zinc}}{65.4g/mol}\\\\\text{Mass of zinc}=(0.0971mol\times 65.4g/mol)=6.35g[/tex]
Hence, the mass of zinc required is 6.35 grams
Which of the following statements describes a problem associated with
chemicals made by chemists?
O
A. They are in medicines,
O
B. They can be released into the environment,
C. They can be found in food,
O
O
D. They can be in cleaning products.
Answer:
option a is answer
Explanation:
suppose we take an example of sodium chloride is always used in medicines
Answer:it’s b
Explanation: trust meh Brodie
__ H2O + ___02 → _H2O2
Answer:
2H2O + 1O2 → 2H2O2
Explanation:
by semiractions:
(1) 2 H2O → H2O2 + 2H+
(2) 2H+ + O2 → H2O2
(1) + (2):
⇒ 2H2O + O2 → 2H2O2
4 - O - 4
4 - H - 4
to what temperature must a sample of nitrogen at 27 degrees C and 0.625atm be taken so that its preassure becomes 1.125atm at constant volume?
Answer:
The sample of nitrogen must be taken to 267 C
Why are relative atomic masses on the periodic tables not whole numbers?
Answer:
They are averages.
Explanation:
atomic numbers on periodic tables are derived from the average value of all the isotopes of the element. So being averages they are sometimes not integers.
Answer:
The sum of the number of protons and neutrons in an atom is called the mass number. Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occurring isotopes. Being an average it would be most unlikely to be a whole number.
Explanation:
How does geothermal energy help form rocks?
How do the physical and chemical properties of the element change?
Physical properties of a substance are measured without changing its composition. Chemical properties describe a substance's potential for chemical change.
Physical and chemical properties are key concepts in understanding how substances interact with one another and change. Physical properties, such as hardness, boiling point, and mass, describe the physical characteristics of a substance without altering its chemical composition. They can be observed or measured during physical changes, which include states of matter like melting, freezing, and vaporisation, where no new substance is formed.
In contrast, chemical properties describe a substance's ability to undergo changes that alter its chemical structure, like flammability or acidity. Chemical changes result in the formation of one or more new substances with different properties, a process where chemical bonds are broken or formed. For example, when carbon burns in oxygen, it forms carbon dioxide, indicating a chemical change from the original substances.
write with examples two conditions under which a double displacement reaction can proceed.
Double displacement reaction:
A double replacement or displacement reaction, the process in which two compounds react and interchange positive cations and negative anions of two reagents, and created two new forms of compounds or products.
Conditions:
For this to occur, start with ionic compounds of two in an aqueous solutions (dissolved in [tex]\mathrm{H}_{2} \mathrm{O}[/tex]).They should react to create an insoluble precipitates, water or gas.A feature of this is that two compounds are reagents and two various compounds are products.
Production of insoluble precipitate
[tex]A g N O_{3}(a q)+N a C l(a q) \rightarrow A g C l(s)+N a N O_{3}(a q)[/tex]
Production of an insoluble gas
[tex]N a_{2} S(a q)+2 H C l(a q) \rightarrow 2 N a C l(a q)+H_{2} S(g)[/tex]
Production of water
[tex]H N O_{3}(a q)+K O H(a q) \rightarrow K N O_{3}(a q)+H_{2} O(l)[/tex]
Examples:
An example is the reaction between silver nitrate and sodium chloride. Silver converts a nitrite ion to a sodium chloride ion, and sodium absorbs a nitrate anion.
[tex]A g N O_{3}+N a C l \rightarrow A g C l+N a N O_{3}[/tex]
Also, other example as below
[tex]\mathrm{CuCl}_{2}(a q)+2 A g N O_{3}(a q) \rightarrow C u\left(N O_{3}\right)_{2}(a q)+2 A g C l(s)[/tex]
There are two equivalent ways to maintain a double displacement equation: cation exchange or anion exchange.
which sequence of coefficients should be placed in the blanks to balance this equation
Answer:
2 ... and 1
Explanation:
Hope this is right / helps
Answer:
It could either be 1 or 2. Depending on the question.
Explanation:
What is the normal boiling point of etanoic acid?
Answer: 244.6°F
Explanation:
6. {THROWBACK!!) A sample of CO2 gas has a volume of 145 Lat STP. How many grams of CO2 are in this sample?
Answer:
284.88 grams of CO₂
Explanation:
Data Given:
Volume = V = 145 L
Standard Temperature = T = 273.15 K
Standard Pressure = P = 1 atm
Universal Gas Constant = R = 0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹
Moles = n = ??
Formula Used:
Assuming that the CO₂ gas is acting ideally we will apply Ideal Gas equation;
P V = n R T
Solving for n,
n = P V / R T
Putting values,
n = 1 atm × 145 L / 0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹ × 273.15 K
n = 6.47 mol
Secondly, Moles are converted to Mass as;
Moles = Mass / M.Mass
Solving for Mass,
Mass = Moles × M.Mass
Mass = 6.47 mol × 44.01 g/mol
Mass = 284.88 grams of CO₂