A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

Gas is produced as the sugar turns black.

Heat is added to the sugar crystals.

The sugar melts and becomes a liquid.

No evidence of chemical reaction is present.

Which of the following could indicate a chemical change?

All of the answers could indicate Chemical Change

identifying one or more new chemical products

For an investigation a student poured a blue solution of CuSO 4 into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and observed the changes. The student inferred that a chemical reaction occurred. What evidence supports this inference?

A dark solid formed on the zinc metal.

The zinc metal remained silver-colored and shiny

The CuSO 4 solution turned blue when the zinc metal was added.

What is the Law of Conservation of Mass?

It states that no matter can be created or destroyed.

It states that no energy can be created or destroyed.

It states that matter can be created or destroyed.

It states that no sound can be created or destroyed.

Which of the following equations are correctly balanced?

6CO 2 + 6H 2 O --> C 6 H 12 O 6 + 6O 2

12CO 2 +H 2 O --> C 6 H 12 O 6 + O 2

CO 2 + 9H 2 O --> C 6 H 12 O 6 + O 2

CO 2 + H 2 O --> 3C 6 H 12 O 6 + O 2

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

the product is half the mass of the reactants

the mass changes depending on the reaction

10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and the liquid color changes. The colored liquid weighs 13 g, what can be concluded?

The gas produced from the reaction weighed 7 g

The gas produced from the bubbles weighed 5 g

The bubbles were evidence of 7 g of matter being destroyed

The gas produced from the reaction weighed 13 g

In a closed system, a chemical reaction takes place. The mass of the reactants in the beginning of the reaction is 25g. What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

You can't tell with the given information.

In a chemical reaction, the mass of the reactants was 15g. The mass of the products was 12g. Did this chemical reaction follow the law of conservation of mass?

You can't tell with the given infomation

Evidence of a Chemical Reaction

Authored by Derrick Morrissey

Science

8th Grade

NGSS covered

Used 28+ times

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32 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is an example of a chemical reaction?

A marshmallow turning black when heated over a fire

A powder dissolving in water to make lemonade

An ice cube melting into a puddle of water

Salt crystals being crushed into a powder

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is a sign that a chemical reaction has occurred?

change in shape

melting

formation of a gas

dissolving

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A change in the size, shape, or state of matter.

chemical change

physical change

chemical reaction

electron change

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?

Experiment 1

Experiment 2

Experiment 3

Experiment 4

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

The level of the substance in the beaker is higher after the other liquid is added.

A yellow solid forms and then settles to the bottom of the beaker.

Small white crystals are left behind in the flask that held the first liquid.

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which of the following is an example that includes evidence of a chemical reaction?

A sample of zinc is placed in water and it settles to the bottom

A solid block of ice is heated and it completely melts into a liquid.

Sugar that is burned gives off an odor and turns brown and then black.

A tomato is placed into a blender and chopped up into smaller pieces.

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Evidence of a chemical reactions is anything that shows -

a new substance has formed

a solid dissolved in a liquid

interaction between 2 gases

a change in the state of matter

Tags

NGSS.MS-PS1-2

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Evidence of a Chemical Reaction

Which of the following is an example of a chemical reaction?

Which of the following is a sign that a chemical reaction has occurred?

A change in the size, shape, or state of matter.

Four students performed four different investigations by combining different substances. Their results are shown in the table provided. In which experiment are new substances being formed?

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

Which of the following is an example that includes evidence of a chemical reaction?

Evidence of a chemical reactions is anything that shows -

A student observes some sugar as it is heated and burns. The student concludes that a chemical reaction has occurred. Which of the following observations about the burning sugar provides evidence of a chemical reaction?

Which of the following could indicate a chemical change?

Which is NOT an example of chemical change?

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