Chemistry Middle School

Use the chemical reaction to answer the question. ​CaCO3→CO2​+CaO A scientist heats 30 grams of calcium carbonate (CaCO3) in the chemical reaction shown.
What is the total mass of the products?
A. 10 grams
B. 15 grams
C. 30 grams
D. 60 grams

Use the chemical reaction to answer the question. ​Fe+O2→Fe2O3​ What happens to atoms of Fe and O2 during the reaction?
A. They are lost.
B. They maintain their properties.
C. They are rearranged.
D. They gain mass.

What is most likely to occur during a chemical reaction?
A. Molecules of the original substance are lost.
B. Mass is conserved.
C. The original substance maintains its properties.
D. New atoms are created.

Use the chemical reaction to answer the question. NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2 A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown.
Which statement about the reaction is correct?
A. There are more H atoms after the reaction.
B. The atoms of the reactants are regrouped during the reaction.
C. Atoms of Na are destroyed during the reaction.
D. Some atoms gain mass after the reaction.

Use the chemical reaction to answer the question. 2H2+O2→2H2O There are four atoms of hydrogen (H) before the reaction.
How many atoms of hydrogen are present after the reaction?
A. 5
B. 4
C. 2
D. 8
PLEASSSSSSSE ANSSSSWER ALL THE QUESTIONS------------

Answers

Answer 1
1.) A
2.)B











Explanation:
Answer 2

The total mass of products obtained in the reaction; CaCO3→CO2​+CaO is  30 grams. Given the reaction; Fe+O2→Fe2O3​, atoms of Fe and O2 are rearranged during the reaction. During a chemical reaction, mass is conserved. Given the reaction NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2, we can see that the atoms of the reactants are regrouped during the reaction.  Given the reaction 2H2+O2→2H2O, there are four atoms of hydrogen before and after the reaction.

According to the law of conservation of mass, atoms are neither created nor destroyed in a chemical reaction. Similarly, mass is neither created nor destroyed.  

This means that the number of atoms of each element before and after the reaction must remain the same. A chemical reaction only involves the rearrangement of atoms in reactants to form products.

The total mass of reactants must be equal to the total mass of products according to the law of conservation of mass.

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Related Questions

This atom is an __________ of the other atom.

Answers

Answer: carbon

Explanation:

because i took notes on atoms last week

Carbon just took the test

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the dependent variable.
A. amount of water
B. height of ice cube
C. size of ice cube
D. temperature of water
E. temperature the ice cube was at its' highest height

Answers

Answer:

B. height of ice cube

Explanation:

The height of the ice cube depends on the  fifferent emperatures tof the water. You just need to remember that the dependent variable is dependent on the independent variable.

I need this ASAP! Thank you!

Answers

Answer:

35

Explanation:

You look at it straight and at the lowest point the liquid fills to.

35 would be your answer each line is one and it starts at 30 and only goes up 5 so it would be 30

MATCH THEM TOGETHER 4. diffraction 5. interference 6. constructive interference 7. destructive interference 8. standing wave 9. resonance a. interaction of two waves that results in a wave with a larger amplitude b. a wave that appears to stay in one place c. increase in amplitude that occurs when external vibrations match an object’s own natural frequency d. interaction of two waves that results in a wave with a smaller amplitude e. the bending and spreading out of waves around the edge of a barrier f. interaction between two waves that meet

Answers

Answer:

Explanation:

a. is constructive interference

b. is standing wave

c. is resonance

d. is destructive interference

e. is diffraction

f. is interference

Hope this helped :)

a horizontal row on the periodic table is called a______________________? Please help !!!!!!!!

Answers

Answer:

Period

Explanation:

horizontal is a period and verticle is a group

Answer: There called periods.

What is the mass number of an atom?

Answers

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.

Answer:

it’s total number of protons and neutrons

2. Calculate the following net forces.
a. Two people push a couch across a room. One pushes with 30 N. The other pushes with 50 N.
b. An uncle plays tug-of-war with his niece and nephew. The uncle pulls one side of the rope with a force of 95 N. The niece and nephew pull the other side of the rope with a force of 40 N and 45 N.
c. Two friends push their friend on a swing with a combined force of 15 N and 20 N.
Text to speech

Answers

Answer:

A. The net force is 80 N.

B. The net force is 10 N going more towards the Uncle than the children.

C. The net force is 35 N.

Explanation:

Net force is the sum of the amount of force on either one side (addition) or two sides (subtraction).

Force is an external agent which is responsible for changing a body's state of rest or motion. It is the push or pull on an object. The net forces acting on the body are 80 N, 10 N and 35 N.

What is a net force?

The sum of all the forces acting on an object is defined as the net force. The net force is able to accelerate a mass. The net force is known as a term which is used in a system when there is a significant number of forces.

When we apply a force on a body, apart from the applied force, there are many other forces acting like gravitational force, frictional force and the normal force.

The net force acting on a body is given as:

Fnet = F₁ + F₂ + F₃ + .....Fₙ

a. Fnet = 50 + 30 = 80 N

b. Fnet = 95 - (40 + 45) = 10 N

c.  Fnet = 20 + 15 = 35 N

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