Why are chemical equations always balanced? Select ALL that apply.

Matter can only be rearranged/conserved.

What does it mean for a reaction to be endothermic? Choose 2 of the following.

When two substances react, the temperature of the mixture decreases.

There is more energy going into the reactant to break the bond than there is energy leaving the product.

When two substances react, the temperature of the mixture increases.

There is less energy going into the reactant to break the bond than there is energy leaving the product.

The amount of energy entering and leaving is the same.

What does it mean for a reaction to be exothermic? Choose 2 of the following.

When two substances react, the temperature of the mixture increases.

There is less energy going into the reactant to break the bond than there is energy leaving the product.

When two substances react, the temperature of the mixture decreases.

There is more energy going into the reactant to break the bond than there is energy leaving the product.

The amount of energy entering and leaving is the same.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

Yes, the amount of atoms for each element are equal on both the reactant and product side.

No, the carbons are not the same number on both the reactant and product side.

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

In any chemical reaction, the mass of the products is always:

the same as the mass of the reactants

slightly less than the mass of the reactants

much less than the mass of the reactants

greater than the mass of the reactants

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?

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

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

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

Chemical Reactions

Authored by Tracy Perun

Chemistry

10th - 12th Grade

NGSS covered

Used 369+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a ___________change, a substance changes into a different substance.

Physical

Chemical

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of these is NOT a sign that a chemical change has occurred?

A loss of transparency

An unexpected color change

A temperature change

The formation of a precipitate

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

Reactants

Products

Atoms

Catalysts

Tags

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The Law of Conservation of Mass states

that matter exists in all states and reacts the same

that matter can only be changed into new substances by introducing a catalyst

that matter exists in the same state throughout any chemical change

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Tags

NGSS.MS-PS1-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many Al atoms are in this compound? 4Al₂O₃

Tags

NGSS.MS-PS1-1

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Which of the following 2 are chemical reactions?

sugar dissolving in water

water turning into steam

burning wood

mixing baking soda and vinegar

tearing paper

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How many Carbons are present on the reactant side?

Tags

NGSS.MS-PS1-1

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Chemical Reactions

In a ___________change, a substance changes into a different substance.

Which of these is NOT a sign that a chemical change has occurred?

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

The Law of Conservation of Mass states

How many Al atoms are in this compound? 4Al₂O₃

Which of the following 2 are chemical reactions?

How many Carbons are present on the reactant side?

How many Hydrogens are on the product side of this chemical equation?

Why are chemical equations always balanced? Select ALL that apply.

In a chemical reaction, if the reactants are heated, the reaction usually happens

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

Chemical Reactions

In a ___________change, a substance changes into a different substance.

Which of these is NOT a sign that a chemical change has occurred?

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

The Law of Conservation of Mass states

How many Al atoms are in this compound? 4Al2O3

Which of the following 2 are chemical reactions?

How many Carbons are present on the reactant side?

How many Hydrogens are on the product side of this chemical equation?

Why are chemical equations always balanced? Select ALL that apply.

In a chemical reaction, if the reactants are heated, the reaction usually happens

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

How many Al atoms are in this compound? 4Al₂O₃