John Dalton's atomic theory described atoms as identical within an element, claimed all matter is composed of atoms, and stated that elements combine in constant ratios in compounds.
Explanation:John Dalton included several characteristics in his description of the atom that were fundamental to the formation of atomic theory. According to Dalton, B. In any element all the atoms are the same is a characteristic of atoms. He argued that each element has atoms that are identical in mass and properties but different from atoms of other elements. Another characteristic he proposed was D. All matter is made up of atoms, asserting that these atoms were the smallest particles constituting matter. Lastly, Dalton included that E. Elements in a compound are always in a constant ratio, meaning that compounds are formed by combining different types of atoms in fixed, small, whole-number ratios. Dalton's atomic theory, although later refined and partially revised, laid the groundwork for modern chemistry by providing a conceptual framework for understanding the composition of matter.
what are possible reasons for a percent yield that is under 100%
Answer:
Percentage Yield is given as,
%age Yield = Actual Yield / Theoretical Yield × 100
This shows that the %age yield is directly depending upon the actual yield. And most of the time the percentage yield is less than 100 % because of the following factors.
Impure Starting Materials:
If the starting materials (reactants) are not pure then reaction will not completely form the desired product. Different by products will form which will decrease the %age yield.
Incomplete Reactions:
Not all reactions go to completion. In many reactions the starting material after some time stops forming the product due to different conditions. Some reactions attain equilibrium and stop increasing the amount of product. While, in some reactions a by products (like water) formed often react with the product to give a reverse reactions. Hence, the chemistry of reactions also causes the decrease in %age yield.
Handling:
Another major reason for decrease in yield is handling the product. Always some of the product is lost during the workup of the reaction like, taking TLC, doing solvent extraction, doing column chromatography, taking characterization spectrums. So, we can conclude that the %age yield will always be less than 100%.
what is the region surrounding the nucleus which is occupied by electrons?????? its a crossword ( _ _ _ _ _ _ _ _ C _ _ _ _)
Answer:
Electron cloud
Explanation:
The electron cloud is an informal term in chemistry and physics. This region describes the negatively charged electrons in their orbit surrounding the nucleus in an atom. The nucleus has protons in it that have a positive charge on it. It is not easy to know where exactly an electron in any specific time but the electron cloud helps to know electron is moving in this specific area.
Is a stick of dynamite potential energetic or kinetic
Answer:Potential Energy
Explanation:
It is because a stick dynamite is a stored energy which have to be acted upon(lighting it) for it to explode
Answer:
Potential Energy
Explanation:
Potential energy is stored energy, whereas kinetic energy is energy resulting from an object's motion. Considering the stick of dynamite has not been set off, and there is not motion, it has stored energy. Thus, it is potential energy.
Are all individuals in a population of animals or a population of plants identical
Answer:i’m not sure sorry
Explanation:
The table below shows properties of the element gold (Au).
Property Gold's
Characteristics
Color yellow
Density 19.32 g/mL
Electronegativity 2.54
Ionization Potential 9.225
Boiling Point 2807°C
Melting Point 1064.58°C
A physical property of gold is _______.
A.
density of 19.32 g/mL
B.
melting point of 1064.58°C
C.
boiling point of 2807°C
D.
all of these
Answer:
a) but also wouldn't the physical property of gold be malleable?
Explanation:
How many molecules are there in 4.00 moles C3H6O3
HELP!
[tex]2.4088 \times 10^{24} \text { molecules }[/tex] are there in [tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]
Explanation:
One mole = [tex]6.022 \times 10^{23}[/tex] (Applicable to the substances like ions, molecules, or atoms). This specified number is called as Avogadro's constant or number. This idea helps us to convert number of moles of a substance to the number of molecules, multiply moles by Avogadro's number, [tex]6.022 \times 10^{23}[/tex]
Given:
[tex]4.00 \text { moles } C_{3} H_{6} O_{3}[/tex]
To find the number of molecules in it
By using Avogadro’s number, convert given moles into molecules as below,
[tex]\text { 4.00 moles } C_{3} H_{6} O_{3} \times \frac{6.022 \times 10^{23} \text { molecules }}{1 \text { mole } C_{3} H_{6} O_{3}}[/tex]
By solving the above, we get
[tex]Number of molecules of $C_{3} H_{6} O_{3}=24.088 \times 10^{23}$[/tex]
[tex]Number\ of\ molecules\ of\ C_{3} H_{6} O_{3}=2.4088 \times 10^{24}\ molecules\ C_{3} H_{6} O_{3}[/tex]
if your hot pack requires 3.0g of a solid to obtain the correct temperature change, instead of the correct amount (1.4g) calculate the percent error
Answer:
MethodsPart A – Preparation of reference hot or cold packsEach group had either hot packs (CaCl2) or cold packs (NH4NO3). Each hot/cold pack was prepared in 20.0mL of water. We used a beaker to consistently measure 20.0mL of water for each trial. We then placed 20.0mL of deionized water in a 100mL beaker. The initial temperature of thewater was measured. My lab partner and I added about 1.0 grams of calcium chloride for hot packs. After the calcium chloride was added, we stirred gently with the glass stirring rod until the solid dissolved. While doing so, we kept the thermometer in the solution and recorded the final temperature change. We monitored the temperature change closely and recorded the maximum temperature. Once that was recorded, we disposed of the solution and dried the glassware carefully. We repeated step 2 again, using 4.0 grams of solid and 8.0 grams of solid. Before beginning Part B, we completed results # 1-2.Part B- Preparation of desired hot or cold packAfter completing results #1-2, we used the answer from results #2 to prepare a 20.0mL hot pack that reached the desired temperature. Once, finished our results were shared on the board. On the board, we reported our data to the class for “grams of solid used” and “final temperature reached”.
Explanation:
How do energy transformations occur in a hydroelectric plant?
A.The kinetic energy of water is converted by a generator into electric energy.
B.The potential energy of water is converted by a transformer into electric energy.
C.The potential energy of water is converted to mechanical energy by a turbine.
D.The kinetic energy of water is converted by a dam into potential energy.
Next
Answer:
A.The kinetic energy of water is converted by a generator into electric energy.
Explanation:
Hydroelectric plant will need a source of flowing water. Water flow to lower ground because of gravity. The gravity will convert potential energy of water that located in higher ground into kinetic energy. These flowing water will be used to move the turbin that will in turn produce electrical energy.
So, the hydroelectric plant is converting the kinetic energy of water into electric energy.
Answer: A: The kinetic energy of water is converted be a generator into electric energy.
Explanation: I took the quiz!
What is a hypothesis?
A. analysis based on an observation.
B. a proposed answer to a question.
C. a conclusion based on analysis.
D. data gathering during an experiment.
Answer:
B
Explanation: it is the correct answer
In the mathematical equation showing that pressure (P) multiplied by volume (V) remains equal to a constant (k) pressure and volume are ___________ proportional
Answer:
Inversely
Explanation:
pV = k
When p increases, V must decrease for k to remain constant.
When V increases, p must decrease for k to remain constant.
When the product of two variables is a constant, they are inversely proportional to each other.
Patrick is giving a presentation on thermal energy to his class. How can he use the terms endothermic and exothermic to explain the
change in thermal energy from one substance to another? Give an example of each term. EXPLAIN
Answer:
In the study of thermochemical processes, things are viewed from the point of view of the system. A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases. The quantity of heat for a process is represented by the letter q . The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic process is negative because the system is losing heat.
Explanation:
Patrick can use the terms exothermic and endothermic to explain changes in thermal energy. Exothermic processes release heat into the environment, like burning wood, while endothermic processes absorb heat, like melting ice.
Explanation:Patrick can explain the change in thermal energy from one substance to another using endothermic and exothermic processes. An exothermic process is one in which heat is released into the surrounding environment. An example of this is the burning of wood in a fireplace where heat is given off as the wood burns, increasing the thermal energy in the room. On the other hand, an endothermic process is one in which heat is absorbed from the surroundings. An example is the melting of ice, which takes heat from the surrounding environment, reducing its thermal energy, to change from a solid to a liquid state. By using these terms, Patrick can effectively explain changes in thermal energy.
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Determine the empirical formula for c6n4o10
Explanation:
We are given with compound C₆N₄O₁₀: mass percentage of all is :
For C = 12 x 6 /288=0.25%
For N= 14 x 4 /288=0.19%
For 0= 16 x 10/288=0.5%
The elements present are :
Atomic mass moles Simplest ratio rounding off
C 12 0.25/12=0.020 0.02/0.02=1 2
N 14 0.9/14=0.06 0.06/0.02=3 6
O 16 0.5/16=0.03 0.03/0.02=1.5 3
The empirical formula derived is : C₂n₆O₃
Watch It!
#3
After watching the examples
in the video of radiation, list 2
other examples that you
come up with on your own.
Answer:
ybvh8idXG)FYVn8jieowsdxcjv 8mis9kobh
Explanation:
What property of metals allows them to be shaped into wires?
Answer:
Ductility
Explanation:
Ductility is the ability of a metal to be converted into a thin wire without getting break and loosing its hardness. The property of Ductility of a metal allows us to make a wider use of them. Some most ductile metals are gold, silver, copper etc. whereas some of the metals with very less ductility are tungsten, steel and other alloys as they are very hard to transform into a thin wire.
A metal with less ductility can be malleable as it can have the ability to be converted into a thin sheet. Not all the metals are ductile but some of them have high ductility, some have less and some of them are non ductile.
Giving Brainliest
What type of rock is pumice? Describe how a pumice rock is likely to change over a long period of time.
Answer:
Pumice is pyroclastic igneous rock that was almost completely liquid at the moment of effusion and was so rapidly cooled that there was no time for it to crystallize. When it solidified, the vapors dissolved in it were suddenly released, the whole mass swelling up into a froth that immediately consolidated.
With time the pumice rocks undergoes with several changes including weathering, erosion, and transportation. The extent of heat and pressure, making the sediments of the pumice rocks into metamorphic rocks distinct in the chemical and physical composition of the parent material
A compound is found to contain 73.23% xenon name 26.77% oxygen by mass. What is the empirical formula for this compound ?
The empirical formula is XeO₃.
Explanation:
Assume 100 g of the compound is present. This changes the percents to grams:
Given mass in g:
Xenon = 73.23 g
Oxygen = 26.77 g
We have to convert it to moles.
Xe = 73.23/ 131.293 = 0.56 moles
O = 26.77/ 16 = 1.67 moles
Divide by the lowest value, seeking the smallest whole-number ratio:
Xe = 0.56/ 0.56 = 1
O = 1.67/ 0.56 = 2.9 ≈3
So the empirical formula is XeO₃.
dialysis is used to purify blood, sea water, and polluted drinking water. true or false?
Why is it not to use resolidified sample in melting point determination
Answer:
It is advisable to use a fresh sample and not a re-solidified one when determining melting point of a substance because when the sample is melted once, it changes its crystal lattice structure to a certain extent. This can cause it to melt at a different temperature the second time around, which will not be an accurate reading.
Explanation:
The temperature at which a substance changes state from its solid form to its liquid form is known as the melting point for that substance. At this temperature, a pure substance will have both its solid as well as liquid states existing in equilibrium with each other.
When a pure, crystalline sample is melted the first time to determine its melting point, its crystal lattice structure gets distorted to a certain extent with the rising temperature. Even if cooled and re-solidified, this original crystalline structure will not melt at the same temperature it did earlier. This is because its crystal lattice is different this time around, leading to an incorrect melting point reading.
What is the mole ratio that can convert from moles of A to moles of B?
To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A).
Convert moles ratio:A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.
There is no straightforward conversion from one substance's mass to that of another. To convert from one mass (stuff A) to another (substance B), first convert A's mass to moles, then apply the mole-to-mole conversion factor (B/A), and then convert B's mole quantity back to grams.
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A new technology company is marketing drones for residential use. The bar graph shows the relation between number of sales and three types of marketing strategies over the company’s first five months of operation. What are the two biggest advantages of using a bar graph to display this kind of data? The graph provides a comparison of the different marketing strategies. The graph helps in selecting the best marketing strategy to improve sales. The graph helps to predict future sales near the end of the calendar year. The graph indicates how many people see the posted advertisements. The graph gives information about the number of people who have received emails.
Answer:
1- The graph provides a comparison of the different marketing strategies
2- The graph helps in selecting the best marketing strategy to improve sales
Explanation:
Hope this help
plz mark brainliest
Have a nice day!!!
Answer: You need 2 answers:
The graph provides a comparison of the different marketing strategies.
The graph helps in selecting the best marketing strategy to improve sales.
Explanation: I just took the test and these are correct.
what mass in grams, of aluminum fins could 3088J of energy heat from 14.77 degrees C to 26.31 degrees C? Aluminum has a specific heat of 0.897/J (g degrees Celsius)?
Answer:
298.32 grams
Explanation:
Amount of energy required by known amount of a substance to raise its temperature by one degree is called specific heat capacity.
The equation used for this problem is as follow,
Q = m Cp ΔT ----- (1)
Where;
Q = Heat = 3088 J
m = mass = ??
Cp = Specific Heat Capacity = 0.897 J.g⁻¹.°C⁻¹
ΔT = Change in Temperature = 26.31 °C - 14.77 °C = 11.54 °C
Solving eq. 1 for m,
m = Q / Cp ΔT
Putting values,
m = 3088 J / (0.897 J.g⁻¹.°C⁻¹ × 11.54 °C)
m = 298.32 g
Which of the following is the si unit of acceleration
Answer:
C
Explanation: Acceleration is defined as the rate of change of velocity with time i.e acceleration = velocity/time.
but velocity is defined as distance moved in one second i.e velocity = distance / time.
distance is measured in meter (m) and time in second (s), then, acceleration = m/s/s. which is meter/second² i.e m/s²
The SI unit of acceleration is meters per second squared (m/s²). It represents the rate of change of velocity per unit of time.
Explanation:The SI unit of acceleration is metres per second squared (m/s²). It is a measure of how quickly an object changes its velocity. For instance, continue driving a car starting from rest, if your speed grows by 6 m/s every second, then your acceleration is 6 m/s². Here, 'metres per second' shows the velocity change and squaring it (second squared) shows the time duration over which this change occurs.
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Complete the paragraph about the formation of sodium phosphide.
Electrons are transferred from atoms of
and the phosphorus atoms
to atoms of
C. This transfer makes the sodium atoms
As a result, the sodium and phosphorus atoms strongly
each other.
Answer:
Electrons are transferred from atoms of (sodium) to atoms of phosphorous
The sodium atom (looses electrons) and the phosphorus atoms
(gains electrons) .
This transfer makes the sodium atoms acquire (positive) charge and phosphorous acquire (negative) charge .
As a result, the sodium and phosphorus atoms strongly (attract) with
each other.
Explanation:
In the paragraph about the formation of sodium phosphide: Electrons are transferred from atoms of sodium to atoms of phosphorous. This transfer makes the sodium atoms acquire positive charge and phosphorous acquire negative charge. As a result, the sodium and phosphorus atoms strongly attract each other.
Between the phosphorous (P) and sodium (Na) atoms, electron transfer occurs to generate sodium phosphide. When phosphorus receives electrons from sodium, sodium loses electrons, leaving sodium ions (Na⁺) with a positive charge and phosphide ions (P³⁻) with a negative charge as a result.
The oppositely charged ions are attracted to one another strongly electrostatically as a result of this charge difference. This kind of link, referred to as an ionic bond, results in the creation of sodium phosphide (Na₃P), a stable molecule in which several sodium ions are completely encircled by phosphide ions, solidly keeping them together in a crystal lattice structure.
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1. In order for a chemical reaction to occur, there
must always be
(1) an effective collision between reacting particles
(2) a bond that breaks in a reactant particle
(3) reacting particles with a high charge
(4) reacting particles with high kinetic energy
Final answer:
Chemical reactions require colliding particles with sufficient energy and proper orientation at the time of collision.
Explanation:
Chemical reactions require a few conditions to occur. Firstly, the reactant particles must collide with each other. The more frequent the collisions, the faster the reaction. Secondly, the particles must collide with sufficient energy to break the old bonds. Lastly, the particles must have proper orientation at the time of the collision.
The correct response is (1) an effective collision between reacting particles. For a chemical reaction to occur, reactant particles must collide with correct energy and orientation, surpassing the activation energy.
To answer the question, let's explore the requirements for a chemical reaction to occur according to the collision theory.
Effective collision: Reactant particles must collide with one another. Only collisions that have the correct energy and orientation lead to a reaction.Orientation: The molecules must align in a way that allows bonds to break and new bonds to form.Activation energy: The particles must collide with enough energy to surpass the activation energy barrier, which is the minimum energy needed to initiate the reaction.Given these points, the correct choice is: (1) an effective collision between reacting particles.
A photon detector captures a photon with an energy of 5.45 ✕ 10^−19 J. What is the wavelength, in nanometers, of the photon?
Answer:
364 nm
Explanation:
The formula for the energy (E) of a photon in terms of its wavelength λ is
E = hc/λ
We can rearrange this formula to give
λ = hc/E
If E = 5.45 × 10⁻¹⁹ J, then
[tex]\begin{array}{rcl}\lambda& = & \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$s} \times 2.998 \times 10^{8}\text{ m$\cdot$ s}^{-1}} {5.45 \times 10^{19} \text{ J}}\\\\& = & 3.64 \times 10^{-7} \text{ m}\\& = & \textbf{364 nm}\\\end{array}\\[/tex]
what is a polar functional group?
I think this is the answer
Final answer:
A polar functional group is a cluster of atoms within a molecule that has polar preferences due to the uneven distribution of electrons, resulting in areas with partial positive and negative charges which enable it to participate in various chemical reactions and interactions with other polar substances, such as water.
Explanation:
A polar functional group is a specific grouping of atoms within a molecule that has a polarized distribution of charges, which means there is an uneven distribution of electron density. This polarity arises because of the presence of electronegative atoms like oxygen, nitrogen, or fluorine, which attract electrons more strongly than other types of atoms in the functional group. These groups have partial positive and negative charges at different points and are often involved in chemical reactions due to their ability to interact with other molecules and ions. A classic example of a polar functional group is the hydroxyl group (-OH), common in alcohols and known for being hydrophilic or water-loving, meaning it can form hydrogen bonds with water and dissolve easily in it. Other examples include carbonyl groups (C=O) in ketones and aldehydes, carboxyl groups (-COOH) in amino acids and fatty acids, and phosphate groups (-PO4) often found in DNA and ATP.
An object with a mass of 6.0 kg accelerates 4.0 m/s^2 when an unknown force is applied to it. What is the amount of the force?
Answer: 24 N
Explanation: solution attached:
F = ma
= 6.0 kg ( 4.0 m/s²)
= 24 N
Function C gives the cost, in dollars, of buying n apples. 6. Which statement best represents the meaning of C (10) = 9?
a. the cost of buying 9 apples
b.the cost of 9 apples is $10
c.the cost of 10 apples
d. ten apples cost $9
Answer:
D. Ten apples cost $9
Explanation:
C, the cost in dollars of buying apples is a function of the number (n) of apples bought
C (10) = $9 implies that the cost of buying 10 apples is $9
The statement 'C (10) = 9' means that ten apples cost $9 based on the given function C which represents the cost of buying n apples.
Explanation:The question is asking for the interpretation of the mathematical function C(n) = 9 when n is 10. In this case, C(10) = 9 means that the cost of 10 apples is $9. This is based on the provided function C which represents the cost of buying n number of apples. So, when n is 10, the cost is 9 dollars. This interpretation is similar to how we calculate the cost of buying fruits in chapters 8 and 9, by multiply the quantity of each fruit by the price.
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Natural selection is the primary mechanism of _______.
A.
reproduction
B.
biodiversity
C.
adaptation
D.
evolution
Answer:
the answer is evolution the other person made me get it wrong
Explanation:
Individuals within populations exhibit some diversity. As a result of possessing slightly different traits, some individuals are better able to survive and reproduce than others. As these individuals are naturally selected, changes in the characteristics of the populations may occur over time. The cumulative change in these characteristics is known as evolution.
So, natural selection is the primary mechanism for evolution.
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Answer:
C
Explanation:
Evolution
What is the percent by mass of hydrogen in, C9H6O3
Hey there!
Molar mass of ( C₉H₆O₃ ) = 162.14 g/mol
atomic mass H = 1.007 amu
Therefore :
H% = atomic mass H / molar mass ( C₉H₆O₃ ) x 100
H % = ( 1.007 / 162.14 ) x 100 =
H% = 0.00621 x 100 =
H% = 0.621