What did Antoine Lavoisier’s experiments demonstrate?
A. Atoms always split into pairs during a chemical change.
B. Mass is neither lost nor gained during a chemical change.
C. Matter can be created during a chemical change.
D. Energy is neither lost nor gained during a chemical change.

Answers

Answer 1
Lavoisier disproved the phlogiston theory. He demonstrated that there was an element called oxygen that played a major role in combustion. He also showed that the mass of products in a reaction are equal to the mass of the reactants. In other words, no mass is lost in a chemical reaction.

Related Questions

A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C. Which of these gases contains a larger number of molecules?

Answers

Answer:

C) Both have equal numbers of moles.

Explanation:

The number of moles would be the same under the same pressure, volume and temperature.

"If A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C then both gases would have equal number of molecules according to Ideal Gas Law."

Both contain equal number of molecules.

According to Avogadro's Law, 1 mole of every substance occupies 22.4 L at STP.

Thus, equal volume of all gases contain same number of molecules at same temperature and pressure.

[tex]PV=nRT[/tex]

where, P = pressure

V = volume

n = moles

R = gas constant, and

T = Temperature

As volume , pressure and temperature are equal for both [tex]H_2[/tex] and [tex]N_2[/tex] gases, therefore both gases contains equal moles and hence equal number of molecules.

Learn more about Avogadro's Law:

https://brainly.com/question/4133756

show how to work it out.
.How many sodium atoms are there in 26.3 grams of sodium oxide (Na2O)? Answer: 2.55 E 23 molecules of Na2O

Answers

Start with your mass given, then divide by total mass of Na2O (found on periodic table), then multiply by avragodros # to get final answer

A student is building an electrical circuit. Which material should she choose for wires, and why.
Look at the screen shot

Answers

D. A metal such as copper, because its atom have very mobile electrons         - A-p-e-x verified!

Have a Great Day!

A blacksmith partners with a team of chemistry and physics graduate students to
develop an anchor for boats that is able to be produced with minimal waste. Which of
the following do scientists need to take into consideration when designing this new
anchor to ensure that it is effective?
A. The color of the metal ions when dissolved in water.
B. The color of the metal
C. How easily the anchor changes temperature.
D. The density of the metal

Answers

B the color of the metal . Hope this helps

Answer:

b

Explanation:

ur welcome

The nucleus of one atom contains 12 protons and 12 neutrons, while the nucleus of another atom contains 12 protons and 16 neutrons. What are the atoms?
A) chromium atoms
B) two different elements
C) two isotopes of an element
D) negatively charged

Answers

Answer:

Option C (two isotopes of an element)

Explanation:

An isotope is two or more forms of the same element that contain equal numbers of protons (as well as electrons) but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties. For example :-

Isotopes of carbon ⇒

¹²C₆ (Carbon-12) has 6 electrons , 6 protons & 6 neutrons.¹⁴C₆ (Carbon-14) has 6 electrons , 6 protons & 8 neutrons.

In the question , both the atoms have same number of protons , but their number of neutrons isn't same. Hence , they are the isotopes of an element.

Which of the following is NOT a true statement?
А The sun's gravity keeps the Earth spinning around it.

B The moon's gravity pulls on the Earth's ocean.

C Earth's gravity keeps the moon close to it.

D Earth's gravity keeps all the planets spinning around the sun.

Answers

Answer:

c is not a true statement

Answer: it’s

Earth gravity keeps all the planets spinning around the sun.

Explanation:

Got it right

In order to prove that the Law of Conservation Mass is obeyed, what are the coefficients
needed to balance the following reaction:
C3Hg +
02
1
CO2 +
H2O

Answers

Answer: [tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for combustion of propane will be :

[tex]C_3H_8+5O_2\rightarrow 3CO_2+4H_2O[/tex]

1234567 sc: thatbitxh.lizzy

Answers

Answer:

okyay

Explanation:

lol

Answer:

12345678

Explanation:

i don't know so yea

At the heart of the stars, nuclear fusion merges _____ together in the nucleus of atoms to create new elements?

Answers

Answer:

lighter atoms especially hydrogen

Explanation:

At the heart of the stars, nuclear fusion merges lighter atoms especially hydrogen together in the nucleus of atoms to create new elements.

During nuclear fusion small atomic nuclei combines to form larger ones with the release of a large amount of energy.

The energy released provides the needed temperature for another set of hydrogen atoms to fuse. This process is in turn yields another set of helium atom which releases a lot of energy.

A chain reaction progresses which leads to the formation of new elements.

How many molecules are in 643.21 grams of Mg3(PO4)2?

Answers

Answer:

643.21g  1 mol  6.022^23

262.87 g   1 mol

= 1.4735E24     [Mg3(PO4)2]

Which one of the following is a chemical property?
A. A wood block is less dense than water
B. Gold bar is shiny
C. Bubbles form when baking soda and vinegar are mixed.
D. Water turns from liquid to gas at 1000C.


pls help thx

Answers

The correct answer is C

The forming of bubbles when baking soda and vinegar are mixed is a result of chemical property.

Chemical Properties

Chemical properties of materials are properties that are due to the chemical composition of the materials.

The formation of bubbles when baking soda is mixed with vinegar is a result of the evolution of carbon dioxide gas.

Baking soda reacts with vinegar to produce carbon dioxide and other products according to the chemical equation below:

NaHCO3 + CH3COOH → CO2 + H2O + CH3COONa

More on chemical properties can be found here: https://brainly.com/question/1728902?referrer=searchResults

The 2 forces acting on the anvil are ___________ and the pull of the _________

Answers

Answer: The 2 forces acting on the anvil are  weight and the pull of the  Gravity

Explanation:

how is carbon dioxide manufacture in the industry ​

Answers

Explanation:

While CO2 can be distilled from the air, that method is expensive and inefficient. Therefore, it is usually captured from other sources where it is a waste material. This could be anything from brewing beer to burning fossil fuels. However, the most efficient way of producing carbon dioxide is from ammonia.

Situation No. 1. Joey is about to start working on his experiment about plant

cell using a compound microscope. He noticed that one of the objective lens is

missing and the course adjustment knob is not working. The eyepiece lens is

also broken.

Answers

Complete question: Learning Task 4: Read the following situations. Identify the part and the

function of the microscope mentioned in each situation. Write your answers in

your answer sheet.

Situation No. 1. Joey is about to start working on his experiment about plant

cell using a compound microscope. He noticed that one of the objective lens is

missing and the course adjustment knob is not working. The eyepiece lens is

also broken.

Answer: The parts of the compound microscope mentioned in this situation includes:

Objective lens, course adjustment knob and eyepiece lens.

Explanation: A compound microscope is a magnifying instrument which can be used to carry out various experiments in a laboratory. According to the working principle of a microscope, the magnified image of the object (plant cell) is first produced by a lens close to the object called the objective lens. This collects light from the object and forms the primary image. A second lens near the eye called the eyepiece lens enlarges the primary image,converting it into one that can enter the pupil of the eye. The different parts and the functions of the compound microscope observed by Joey includes:

--> Objective lens: The objective lens gathers light from the specimen, which is focused to produce the real image that is seen on the eyepiece lens. It's functions includes formation of primary image and determination of the quality of the image produced.

--> Course adjustment knob: This is the part of microscope that is used in focusing the specimen that is under observation through changing the distance between the lens and the specimen. Therefore it functions to bring the specimen into general focus.

--> Eyepiece lens: This is the lens that is closest to the eye of the observer. It functions to magnify the image formed by the objective lens as it's being placed near the focal length of the objective lens.

Which statement best describes the weather shown by the blue triangles going one way and the red semicircles going the other way on a line on a weather map?


A cold front can cause heavy rain, thunder, and lightning.


A stationary front may produce rainy or snowy weather for several days.


An occluded front can cause light to heavy precipitation that may last several days.


A warm front brings drizzly weather.

Answers

Answer: The statesmen that best describes the weather shown by the blue triangles going one way and the red semi-circles going the other way on a line in the weather map is “warm front brings drizzly weather.

Answer:

A stationary front may produce rainy or snowy weather for several days.

Explanation:

Need help on those two please

Answers

Answer:

B. Liquid

B. Gas

Explanation:

I majored in Chemistry

Which job title describes a person with a career in green energy?

Answers

Answer:

Natural resource professional

Explanation:

The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.

What is green energy?

Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.

The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.

This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.

Therefore, the correct option is c., hydroelectric technician.

To learn more about renewable energy, refer to the link:

https://brainly.com/question/17373437

#SPJ2

The question is incomplete. Your most probably complete question is given below:

Elevator installer

sewing machine operator

hydroelectric technician

animal trainer

How many grams are in 25.0 moles of carbon tetrachloride (CCI)?

Answers

Answer:

3.84 kg

Explanation:

CCl4 molar mass: 153.82 g/mol

n = mass / molar mass

25 moles = mass / 153.82 g/mol

mass = 25 x 153.82

mass = 3845 g or 3,84 kg

What is temperature

Answers

Answer:

I just love the killua pfp

I think b

Answer:

c

Explanation:

because it forces and help it

how many molecules are in 0.89 of silver

Answers

Answer:

5.36 × 10²³ molecules

Explanation:

Given data:

Number of moles of silver = 0.89 mol

Number of molecules = ?

Solution:

Avogadro number:

The number 6.022 × 10²³ is called Avogadro number.  

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of molecules of silver:

1 mole contain 6.022 × 10²³ molecules

0.89 mol  ×  6.022 × 10²³ molecules /1 mol

5.36 × 10²³ molecules

If light and sound Travel from point a to point b And start at the same time, which is gonna reach point b first

Answers

Light would reach point b first

An atom is found in group 17 and contains 10 neutrons. How many valence
electrons does it have? *

Answers

Just 7 electrons this is the answer

The Aufbau Principle describes that
O electrons with the same spin cannot occupy the same orbital.
electrons will occupy single orbitals within and energy level before doubling up
electrons fill lower energy levels first before occupying higher energy levels.
O electrons in the same level have the same amount of energy

Answers

Answer:

electrons fill lower energy levels first before occupying higher energy levels.

Explanation:

The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.

In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.

It states that "sublevels with with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order.

Calculate the percent composition of Hydrogen in C6H1206​. Periodic table question

Answers

Answer:

6.7%

Explanation:

The formula of the compound is given as:

        C₆ H₁₂  O₆

The problem here is to find the percent composition of hydrogen.

First;

Find the molar mass of C₆ H₁₂  O₆  = 6(12) + 12(1) + 6(16)  = 180g/mol

Secondly;

Percentage composition of H = [tex]\frac{molar mass of H}{Molar mass of compound}[/tex]  x 100

Percentage composition of H = [tex]\frac{12(1)}{180}[/tex] x 100  = 6.7%

Imagine that you skipped from one end of a room to the other end of the room. Explain how gravity affected your motion.​

Answers

Answer:

when you skipped you jumped up but gravity pulls you to the ground when you jump

Explanation:

On skipping in a room, gravity affects the motion by pulling back to the ground.

Gravity has been defined as the force acting by the earth in the downward direction. It has been the strongest force and has been responsible for life on earth.

On skipping in a room from one end to another, there has been a force applied in the direction against gravity. The application of force has resulted in an upward motion. The gravitational force has been acting in the downward motion, and result in pulling back to the ground.

Thus, on skipping in a room, gravity influences the motion by pulling back to the ground.

For more information about gravity, refer to the link:

https://brainly.com/question/1479537

how are the foram fossils from the two time periods different?

Answers

Answer:

here are several resons that fossil foraminifera are especially valuable for determining the relative ages of marine rock layers. They have been around since the Cambrian, over 500 million years ago. They show fairly continuous evolutionary development, so different species are found at different times.

30 PTS!! chemistry - a new element chemistry TCT

Answers

Answer:

so is this a project or a quiz

20 POINTS TO WHO ANSWERS THIS
How can a chemical reaction be sped up?

Select from the drop-down menu to correctly complete the statement.
Increase the to allow the reaction to happen with more energy.
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature

Answers

answer: D

Here is a list of the most common ways to speed up a chemical reaction

Increase the temperature (reactions that absorb energy)

Decrease the temperature (Reactions that release energy)

10. There are two bears that both have the same proteins for ear shape in their cells. The bears have
different parents. What can you say about the bears' ear shape?

Answers

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

I majored in Chemistry

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

Which type of bond will most likely be found in HBr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?
an ionic bond
a metallic bond
a polar covalent bond
a nonpolar covalent bond

Answers

Answer:

C. A polar covalent bond

The most likely bond found in HBr is a polar covalent bond.

What kinds of bonds exist?Ionic bond : It is formed between metals and nonmetals and the difference in their electronegativities is higher than 1.7.Metallic bond : It is formed between metals with and the difference in their electronegativities is very small.Polar covalent bond : It is formed between nonmetals and the difference in their electronegativities is between 0.4 and 1.7.Nonpolar covalent bond: It is formed between nonmetals and the difference in their electronegativities is lower than 0.4.

In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:

ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76

The most likely bond found in HBr is a polar covalent bond.

Learn more about polar covalent bonds here: https://brainly.com/question/3978603

Other Questions
Write 3-5 sentences in response to the writing prompt below.The Secret Door....What is behind the door?Where does it lead?Who would you take through it with you?You may write a list or a paragraph. Do not forget to underline your spelling words.Spelling List: beginning, committing, controlling, excelling, grinning, hopping, permitting, plotting, running, shopping Transcribe the following DNA strand. Then translate the tRNA strand you wrote. Maya painted 3/4 of her art project in the morning and 1/8 of her project in the evening which wich equation can my used to find how much of project she painted in all (Multiple choice/ brainiest will be given)Can I please get some help with this answer? Need help please. about social studies. Question #2Multiple ChoiceHow many local, county, state, and federal law enforcement agencies are in operation in the United States?O 650,000O 65,000mayO 650O 16,500 To estimate the mean height of female high school juniors, you take arandom sample of 30 female students and get these results (in inches):72,51, 67, 68, 61, 69, 58, 56, 60, 5666, 61, 60, 59, 59, 54, 58, 53, 68, 6357, 62, 63, 64, 56, 62, 58, 67, 57, 70 If the o is 5.3, based on past research, and you want to construct a 97%confidence interval using (estimate) + (margin of error)= (estimate) what's your point estimate of ?A. 30B. 5.4C. 65D. 61.17 The law of ____ states that energy in a system can change forms but can never be created or destroyed. What are the Slope and Y-intercept of y>-2x+3 PLEASE HELPWhich of the following questions are correct? Select all that apply. I need help please Ill give u 15 for the correct answers The sides of a triangle are in the ratio 10:6:24. The perimeter is 440 inches. What is the length of each side? given f(x)=2x-4 and g(x)=-3x^2+5x determine f(3)-g(2) PLEASE HELP!!!!!! WHOEVER ANSWERS FIRST WILL BE MARKED BRAINLIEST!! The office store sells printer paper. Last week, The store sold 324 packs of white paper, which was 40% of the paper it was sold for the whole week. The store also sold 81 packs of blue paper,243 packs of yellow paper,and 162 packs of pink paper, The store manager needs to determine The percentages of the other paper sold Explain what Buds mother meant by what she said. What was the life lesson she was trying to teach? Use evidence from the passage in your response. PLEASE PLEASE PLAESE HOW MANY TIMES CAN I SAY PLEASE I NEED HELP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!answer likeanswer 1. _____________Answer 2.____________answer 3.______________answer 4.______________ How to I find the common difference and the first five terms using recursive formula? The household income for the Washington family is $100,000, and they pay an income tax rate of 25%. What is the Washington'sannual disposable income?A)$100,000B)$25,000C)$50,000D)$75,000 Suppose you have $50, how much change would you receive if you bought a DVD that cost $27.99?