Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Coal is made up of more than one element

What are Chemical Reactions?

a process in which atoms rearrange to form new substances

letter and numbers showing the types and number of atoms

Pat wants to create a chemical reaction between oil and water. He adds oil to a beaker of water and notices that the liquids do not mix. He then shakes the beaker and the drops of oil become suspended through the water for a few moments before returning to their separate layers. Did Pat succeed in creating a chemical change?

No, because no new substances were formed.

Yes, because the oil was evenly suspended.

Yes, because the solution was permanently changed.

The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material. What has occurred?

heat was released from the copper

Which of the following is a chemical reaction?

Atoms of the reactants rearrange to form a new substance

New atoms are formed when substances are mixed together

A solid material melts and becomes a liquid

A student dissolves 3 gram of sugar in 10 grams of water. She then determines the mass of the solution. What is the mass of the dissolved sugar and water?

13 grams because the substance is a mixture and the molecules are floating next to each other.

13 grams because a chemical reaction occurred making a new substance.

Less then 13 grams because the water absorbed the sugar.

More than 13 grams because the sugar absorbed the water.

Which of the following is true about the principle of the conservation of mass?

The mass of the products is equal to the mass of the reactants.

The mass of the products is never equal to the mass of the reactants.

The mass of the products is less than the mass of the reactants.

The mass of the products is greater than the mass of the reactants

Jay had two clear liquids in bottles. The mass of one liquid was 10.0 grams and the other was 7.0 grams. When he mixed them, a yellow solid formed and settled to the bottom of the bottle. He predicted that the liquid plus the solid would have more mass, so he put the bottle on a scale. The mass was 17.0 grams. Why did the mass not change?

Do to the Law of conservation of mass, matter cannot be created nor destroyed so the mass is the same as the reactant and the product.

Because it is a mixture and mass doesn't change.

He forgot to tare his bottle and the scale had the mass of the bottle added in.

Which statement is always true about conservation of matter?

The mass of a system does not change during a chemical reaction.

If a gas forms, the mass of a system decreases.

If a solid forms, the mass of a system increases.

The mass of a system changes when a substance changes from liquid to gas, but it does not change in a chemical reaction.

IQWST IC2 Lessons 6-12 Review

Authored by Hilary Cochran

Science

7th Grade

NGSS covered

Used 477+ times

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21 questions

Show all answers

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A chemical reaction occurs when Kelly combines carbon dioxide (CO2) and water (H2O) together.
CO2 + H2O → H2CO3 ?
What is the product of the reaction?

H2O2 + CO2

H2CO3

H3CO2

H2O + CO2

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What best explains why electrolysis is a chemical reaction?

Electrolysis is a chemical reaction because it makes two new substances identical to water.

Electrolysis rearranges the atoms of water into two new substances with different properties than water.

Electrolysis boils water until the water vapor turns into new susbtances.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

True or false: Electrolysis is a CHEMICAL reaction

True

False

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A chemical reaction occurs when Kelly puts carbon dioxide (CO2) and water (H2O) together.
H2O + CO2 → H2CO3 ?
What are the reactants?

H2O2 + CO2

H2CO3

H3CO2

H2O + CO2

Tags

NGSS.MS-PS1-1

MULTIPLE SELECT QUESTION

30 sec • 1 pt

What could be considered EVIDENCE of a chemical reaction? CHOOSE ALL THAT APPLY

Formation of bubbles

Change in color

Production of gas

Temperature change

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

30 sec • 12 pts

The substances at the beginning of a chemical equation are called the ____

product

yield

chemical symbol

reactants

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the arrow in a chemical equation...
H_{2 +}O --> H₂O

Reactants

Products

Yields/Forms/Produces

Chemical Equation

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IQWST IC2 Lessons 6-12 Review

A chemical reaction occurs when Kelly combines carbon dioxide (CO2) and water (H2O) together.CO2 + H2O → H2CO3 ?What is the product of the reaction?

What best explains why electrolysis is a chemical reaction?

True or false: Electrolysis is a CHEMICAL reaction

A chemical reaction occurs when Kelly puts carbon dioxide (CO2) and water (H2O) together.H2O + CO2 → H2CO3 ?What are the reactants?

What could be considered EVIDENCE of a chemical reaction? CHOOSE ALL THAT APPLY

The substances at the beginning of a chemical equation are called the ____

What is the arrow in a chemical equation...H2 + O --> H2O

Which of the following models best demonstrates a balanced chemical equation?

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

What are Chemical Reactions?

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Popular Resources on Wayground

Discover more resources for Science

A chemical reaction occurs when Kelly combines carbon dioxide (CO2) and water (H2O) together.
CO2 + H2O → H2CO3 ?
What is the product of the reaction?

A chemical reaction occurs when Kelly puts carbon dioxide (CO2) and water (H2O) together.
H2O + CO2 → H2CO3 ?
What are the reactants?

What is the arrow in a chemical equation...
H_{2 +}O --> H₂O