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WorksheetsPhysical/Chemical Changes and Conservation of Mass
Total questions: 17
Worksheet time: 19mins
Which chemical equation supports the law of conversation of matter?
Which chemical equation shows a chemical reaction where mass is conserved?
Which chemical equation shows a balanced reaction between copper and silver nitrate solution?
Which equation is balanced to obey the Law of Conversation of Matter during the reaction?
Which demonstrates a chemical change?
glass breaking
a garbage can rusting
sugar dissolving in water
water evaporating from a sidewalk
The chemical equation below shows the amount of the reactants used and the amount of only one of the products formed.
How much water (H₂O) should be formed in this chemical reaction?
(Think Law of Conservation of Mass)
5g
9g
27g
31g
Which of these is NOT a sign a chemical change has occurred?
color change
temperature change
bubble formation
cutting material
SELECT 2: 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
The total mass of the reactants is 18.4g. What would the total mass of the products be? (NOTE: Refer to the Law of Conservation of Mass)
18.4g
9.2g
4.6g
36.8g
This change is a
chemical reaction
physical change
musical change
all answers are correct
The total number of Oxygen (O) atoms in 3N2O5 is...
5
2
15
3
What are the molecules on the left side of a chemical equation called?
2H2 + O2 --> 2H2O
Reactants
Products
Yields
Ingredients
What is the molecule on the right side of this chemical equation called...
2H2 + O2 --> 2H2O
Reactant
Product
Yield
Ingredient
Which of the following is an example of a chemical change?
boiling water into steam
ripping paper
melting an ice cube
baking a cake
A science class wants to determine if zinc will react with hydrochloric acid. One hundred mL of hydrochloric acid solution are added to a beaker. Several small pieces of zinc metal are dropped into the hydrochloric acid. After twenty minutes, the solid material is removed. The following table compares the properties of hydrochloric acid, zinc, and the remaining solid material.
Has a physical or chemical change occurred?
A chemical change has occurred because there was remaining solid material. If the change was only physical, the mixture would have all turned to liquid.
A chemical change has occurred because the remaining solid material had different properties (melting point, boiling point, and density) than the two reactants. This indicates that a new substance was created.
A physical change has occurred because there was remaining solid material. If the change was chemical, the zinc would have completed dissolved in the hydrochloric acid.
A physical change has occurred because the remaining solid material had different physical properties (melting point, boiling point, and density) than the hydrochloric acid and zinc. Only a change in chemical property, such as flammability, would indicate a chemical change.
A chemist wants to know if mixing two liquids, Substance A and Substance B, will result in a chemical reaction. The chemist pours 10 milliliters of Substance A into a beaker containing 30 milliliters of Substance B and observes what happens. Which changes in the resulting mixture would indicate that a chemical reaction occurred between Substance A and Substance B? Choose all that apply.
The total volume of liquid in the beaker becomes 40 milliliters.
A strong odor occurs.
The resulting mixture is denser than Substance A or B.
Substance A mixes with Substance B.
The resulting mixture is less dense than Substance A or B.
What type of change took place when a copper penny turned green after a few years?
Physical change
Chemical change
