Answer:
a compound
Explanation:
A substance composed of two or more pure substances mixed together in variable proportions, with variable composition throughout, is called a heterogeneous mixture. These mixtures can have components that retain their individual chemical identities, which can often be physically separated.
When two or more pure substances are mixed together in variable proportions, without any chemical bonding between them, the resulting substance is known as a mixture. These mixtures where the composition is not consistent throughout are called heterogeneous mixtures. Examples include sand and water, or oil and water. Unlike a compound, where elements are in fixed proportions and chemically bonded, the substances in a mixture retain their individual chemical properties and can often be physically separated.
Mixtures stand in contrast to compounds, which are substances composed of two or more elements in fixed proportions and can only be separated into their constituent elements by chemical methods.
The concept of composition variables, such as the number of moles of each component, is crucial for describing the properties of mixtures. Air, with its variable amounts of nitrogen and oxygen, is an example of a mixture with each component retaining its characteristic properties.
An Apple iPhone has a mass of 112 g. What is its weight in ounces? (Given: 1 lb = 454 g; 1 lb = 16 oz)
Answer:
3.95 oz
General Formulas and Concepts:
Chemistry - Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Apple iPhone = 112 g
Step 2: Identify Conversions
1 lb = 454 g
1 lb = 16 oz
Step 3: Convert
[tex]112 \ g(\frac{1 \ lb}{454 \ g} )(\frac{16 \ oz}{1 \ lb} )[/tex] = 3.94714 oz
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.94714 oz ≈ 3.95 oz
Final answer:
The weight of an Apple iPhone can be calculated by converting the mass from grams to pounds and then from pounds to ounces which results in approximately 3.94 ounces.
Explanation:
To find the weight of an Apple iPhone in ounces, we can use the conversion factors provided. Given that 1 pound (lb) is equal to 16 ounces (oz) and 1 pound (lb) is equivalent to 454 grams (g), we can convert the mass of the iPhone from grams to pounds and then from pounds to ounces.
First, convert the mass of the iPhone from grams to pounds:
112 g ÷ 454 g/lb = 0.246 lb
Next, convert the mass in pounds to ounces:
0.246 lb × 16 oz/lb = 3.9376 oz
Therefore, the weight of the Apple iPhone is approximately 3.94 ounces.
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.
Question 1 of 10
2 Points
According to Le Châtelier's principle, how will a pressure increase affect a
system that includes matter in the gas phase and another phase?
O
A. The total number of gas molecules will increase.
O
B. The equilibrium reactions will slow down.
C. The system will remain unchanged.
ooo
D. The total number of gas molecules will decrease.
The increase in pressure will result in the decrease of the total number of gas molecules due to the shift in equilibrium toward the side with fewer moles of gas, following Le Châtelier's principle.
Explanation:According to Le Châtelier's principle, how will a pressure increase affect a system that includes matter in the gas phase and another phase? The correct answer is D. The total number of gas molecules will decrease. This is because Le Châtelier's principle states that a pressure increase will shift an equilibrium toward the side of the reaction with the fewer number of moles of gas, as this helps to counteract the change by reducing the pressure within the system. This principle is particularly useful when predicting how a change in pressure will affect the position of equilibrium in a chemical reaction involving gases.
Final answer:
Le Châtelier's principle indicates that increased pressure in a gaseous reaction shifts equilibrium toward the side with fewer gas molecules to reduce the stress caused by the pressure increase.
Explanation:
According to Le Châtelier's principle, a pressure increase in a system involving gases will cause a shift in equilibrium towards the phase with the fewer number of gas molecules. In the case of a reaction with different numbers of gas molecules on each side of the reaction, such as 2NO(g) + O₂(g) ⇒ 2NO₂(g), an increase in pressure would shift the equilibrium towards the formation of NO₂, since it has fewer gas molecules (2) compared to the reactants (3). This phenomenon occurs because the system responds to reduce the pressure by favoring the production of fewer molecules that would occupy less volume.
the number of moles of H2O produced from 339 grams of SnO2
Answer:
moles of H2O = 4.5 mol
Explanation:
balanced equation:
SnO2 + 2H2 → Sn + 2H20∴ mass SnO2 = 339 g
∴ molar mass SnO2 = 150.71 g/mol
⇒ moles SnO2 = (339 g)(mol/150.71 g) = 2.25 mol SnO2
⇒ moles H2O = (2.25 mol SnO2)(2 mol H2O/mol SnO2)
⇒ moles H2O = 4.5 mol H2O
Which option correctly describes the enthalpy of formation?
Answer: Endothermic reaction.
Explanation: A chemical reaction in which energy is absorbed from the surrounding environment.
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.
Learn more about electric force:
brainly.com/question/8960054
brainly.com/question/4273177
Learn more about gravitational force:
brainly.com/question/1724648
brainly.com/question/12785992
#LearnwithBrainly
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
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.
Learn more about cell membrane, here:
https://brainly.com/question/13524386
#SPJ2
How many orbitals are in the n = 3 level?
A box is initially at the top of a slide, storing 80 J of gravitational energy. The isolated system includes the box, slide and earth.
As the box slides down the frictionless slide, what happens to the total energy of the system?
1-the isolates system stores slightly less than 80 J of total energy, and it is converted to a different form of energy
2- The isolated system stores 80 J of total energy, but it is converted to a different foe of energy
3- The total energy of the system increases to more than 80 J as it gains other forms of energy
4- The total energy of isolated system decreases to 0 once the box reaches the bottom of the slide
Answer:
It stays àt 80j
Explanation:
The total energy of the isolated system remains 80 J as the gravitational potential energy is converted into kinetic energy in a frictionless environment, maintaining conservation of energy.
As the box slides down the frictionless slide, the total energy of the system remains constant due to the conservation of energy principle. The initial 80 J of gravitational potential energy is progressively converted into kinetic energy as the box moves down the slide. Since the slide is frictionless, there are no dissipative forces like friction to convert mechanical energy into heat. Hence, the isolated system, which includes the box, slide, and earth, will still store 80 J of total energy, but in different forms (mostly kinetic energy when the box is at the bottom of the slide).
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.
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 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:
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
Elements that typically give up electrons _______
Answer:
metals? I'm not 100% sure, sorry if I'm wrong.
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.
__ 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
A permanent magnet can affect:
O
A. both permanent magnets and electromagnets.
O B. both non-magnets and electromagnets.
O
c. only permanent magnets.
O
D. only electromagnets and charged particles.
SUBMIT
Answer: A
both permanent magnet and electromagnets.
i hope that helps
Final answer:
A permanent magnet can affect both other permanent magnets and electromagnets, as well as metals such as iron and nickel. It cannot attract non-metals like plastic or wood and can also exert a force on charged particles when they are in motion.
Explanation:
The question concerns the effects a permanent magnet can have on various objects and fields, particularly addressing what a permanent magnet can affect. A permanent magnet can affect both other permanent magnets and electromagnets by exerting a magnetic force on them. Magnets can also affect objects made of materials that are attracted to magnets, such as iron and nickel. These materials are typically metals, not non-metals like plastic or wood, which do not respond to magnetic fields.
Furthermore, a magnetic field can exert a force on charged particles, such as electrons, when they are in motion. This is a fundamental principle of electromagnetism, a branch of physics that studies the interaction between electricity and magnetism. Consequently, the correct answer to the question is that a permanent magnet can affect both permanent magnets and electromagnets.
How many atoms are contained in 0.633 moles of Ni? ( show work)
Answer:
1.0511458x10^22
Explanation:
0.633 mol/ 1 x 6.022x10^23/1 mol
How is human use of coal connected to water and air quality?
The human use of coal impacts air and water quality significantly. The burning of coal results in air pollution, contributing to global health and environmental issues. Additionally, processes related to coal use also contaminate local water bodies, damaging aquatic ecosystems and affecting the safety of drinking water.
Explanation:The human use of coal has significant impacts on both air and water quality. When coal is burned for energy, it releases pollutants, including sulfur dioxide and nitrogen oxides into the atmosphere. These substances can lead to air pollution, contributing to issues like acid rain, smog, respiratory diseases, and global warming.
Coal mining and combustion also affect water quality. Acid mine drainage, where water in coal mines becomes acidic and leaks out, can contaminate local water bodies, harming aquatic life and making the water unsafe for human consumption. Moreover, coal-fired power plants often discharge waste materials containing heavy metals like mercury into water bodies, further deteriorating water quality.
Learn more about the Impact of coal on air and water quality here:https://brainly.com/question/32849086
#SPJ2
Name two kinds of rocks formed by conduction of energy.
Answer:
pumice and gneiss
Explanation:
both are formed by conduction of energy
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.
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
How does geothermal energy help form rocks?
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
Calculate the mass of 15.73 L of krypton gas at STP.
Answer: m= 58.8 g Kr
Explanation: solution attached:
Find first the number of moles for Kr.
Use Ideal gas law formula PV= nRT and derive for n.
Convert moles to mass using the molar mass of Kr.
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.
Learn more about the solution here: https://brainly.com/question/251701
#SPJ2
When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl?
2HCl + Na2S → H2S + 2NaCl
Answer:
mol H2S = 1.28 mol
Explanation:
balanced reaction:
2HCl + Na2S → H2S + 2NaCl∴ moles HCl = 2.56 mol
⇒ moles H2S = ?
⇒ moles H2S = (2.56 mol HCl)*(mol H2S/2 moles HCl)
⇒ moles H2S = 1.28 mol
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.
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: