NEW
Font size
WorksheetsChemical Reactions Quiz
Total questions: 23
Worksheet time: 21mins
Which of these shows a chemical reaction?
Mixing vinegar and baking soda to create bubbles.
Melting ice to form water.
Breaking a glass into smaller pieces.
Dissolving sugar in water.
A student mixes two liquids, and bubbles appear. What does this show?
A new solid formed.
A chemical reaction happened.
The liquids stayed the same.
The volume of the liquids increased.
Which one is a chemical change?
Tearing paper into smaller pieces.
Burning a piece of paper.
Freezing water into ice.
Mixing oil and water.
What happens to mass during a chemical reaction?
It increases.
It decreases.
It stays the same.
It disappears.
A clear liquid and a yellow liquid are mixed. The solution turns green, and bubbles form. What does this show?
A physical change happened.
A chemical reaction happened.
The liquids combined but did not react.
The reaction cooled down the liquids.
A student heats a piece of metal until it glows red and then cools it down. Is this a chemical reaction?
Yes, because the metal changed color.
No, because the metal did not change chemically.
You mix a white powder with water, and the solution gets cold. What kind of reaction is this?
Exothermic, because heat is released.
Endothermic, because heat is absorbed.
Physical change, because no new substance forms.
Combustion, because the powder reacts with water.
When wood burns, ash, heat, and gases form. Is this an example of the conservation of mass?
Yes, because the mass of the ash equals the mass of the wood.
No, because some of the mass disappears as smoke.
Yes, because the total mass of the products equals the reactants.
No, because gases do not have mass.
What happens when a solid dissolves in water?
The molecules of the solid break apart but stay the same substance.
The molecules of the solid form a new substance with the water.
The solid disappears completely and loses its properties.
The water changes into a different substance.
A scientist mixes two liquids, and the total mass before and after the reaction is the same. What does this show about the reaction?
Mass is not conserved because the liquids combined.
Mass is conserved because the products have the same mass as the reactants.
The reaction did not happen because the mass stayed the same.
The mass changed into energy during the reaction.
A student designs a hand warmer using a chemical reaction. The reaction releases heat. What type of reaction is this?
Endothermic, because heat is absorbed.
Exothermic, because heat is released.
Physical change, because no new substance forms.
Combustion, because heat is produced.
A blue liquid and a clear liquid are combined. A white solid forms and settles to the bottom. How can you tell if this is a chemical reaction?
A color change and a solid forming show a chemical reaction happened.
The liquids mixed completely, showing no reaction occurred.
The white solid is part of a physical change only.
The liquids changed states but did not react.
Why might bubbles or color changes show a chemical reaction?
They prove energy was released.
They show a new substance formed.
They indicate the reactants were used up completely.
They mean the substances did not mix properly.
Which of these are examples of chemical changes?
Rust forming on a car and wood burning.
Ice melting and salt dissolving in water.
Cutting paper and boiling water.
Water freezing and steam condensing.
In this chemical equation, the elements in red are the_______.
Products
Reactants
Subscripts
Coefficients
In the picture, which box on the right shows the correct products according to the Law of Conservation of Mass?
A
B
C
D
Is mass being conserved?
Yes
No
Not enough information
A researcher began the following reaction with 52.6 grams of sugar and Sulfiric Acid in part A. The final mass of the products in part B would MOST LIKELY be:
More than 52.6 grams
Less than 52.6 grams
Exactly 52.6 grams
Cannot be determined
