WorksheetsChemical and Physical Change
Total questions: 31
Worksheet time: 26mins
Name
Class
Date
1.
what is the definition of physical change?
a)
any change that results in the formation of new chemical substances.
b)
rusting
c)
changes affecting the form of a chemical substance, but not its chemical composition.
d)
any property that is measurable, whose value describes a state of a physical system
2.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
sour milk
3.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
4.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
5.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
6.
One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?
a)
evaporation; chemical change
b)
condensation; physical change
c)
evaporation; physical change
d)
condensation; chemical change
7.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
8.
Is making salt water to gargle with a physical or chemical change?
a)
physical
b)
chemical
9.
a copper penny turning greenish after a few years.
a)
Chemical Change
b)
Physical Change
10.
A group of students investigated physical and chemical changes using paper. The students recorded their observations in a table.
Which student correctly recorded all the changes that took place?
Which student correctly recorded all the changes that took place?
a)
Student 1
b)
Student 2
c)
Student 3
d)
Student 4
11.
A change in a state of matter is represented in the diagrams below. Which statement describes the process occurring from beaker 1 to beaker 2?
a)
Solid ice is changing into gas.
b)
Liquid water is changing to gas.
c)
Solid ice is melting to liquid water.
d)
Gaseous steam is condensing to solid ice.
12.
Hydrochloric acid reacts with magnesium to produce hydrogen gas
a)
Physical change
b)
Chemical change
13.
What type of change is this?
a)
A chemical change
b)
A physical change
14.
Is mold growing on cheese a physical or chemical change?
a)
Physical
b)
Chemical
15.
Is copper tarnishing a physical or chemical change?
a)
Physical
b)
Chemical
16.
Rate of chemical reaction means
a)
amount of product formed
b)
speed of reaction
c)
concentration of reacting particles
d)
combining reactants with products
17.
To slow down a chemical reaction you will do one of the following:
a)
Place the reactants in hot water
b)
Place the products in ice bath
c)
Place the reactants in a ice bath
d)
Keep stirring the reactants with a stirring rod
18.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Neutralise the reaction
d)
increase collision between the particles thus increasing the rate.
19.
A student is studying the effect of temperature on the speed of a reaction between hydrochloric acid and magnesium ribbon. What is the independent variable in her experiment?
a)
Hydrochloric acid
b)
Speed
c)
Temperature
d)
How fine is the magnesium ribbon
20.
Raising the temperature of a chemical reaction would make the reaction __________________.
a)
happen slower
b)
happen faster
c)
stop completely
d)
proceed as normal
21.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
22.
Can matter be created or destroyed?
a)
Yes, it can be created.
b)
Yes, it can be destroyed.
c)
No, matter is always conserved
d)
None of these
23.
The mass after a physical change, such as ice melting into water, stays the same
a)
True
b)
False
24.
The total amount of matter (atoms) before and after a chemical reaction (change), remains the same.
a)
True
b)
False
25.
What is the law of conservation of mass?
a)
Matter changes when reacted or changed.
b)
The mass of all reactants are changed during a physical or chemical change
c)
The mass of the reactants is the same as the mass of the products
d)
The mass of the products is different than the mass of the reactants.
26.
What will weigh more when a chemical change is complete? The reactants before the chemical reaction, or the product after the reaction is complete?
a)
They both will weigh the same
b)
The product always weighs more than the reactant
c)
The reactant will weigh more than the product
d)
They both will loose mass after the reaction
27.
Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.
a)
His chemical reaction defied the law of conservation of mass
b)
The product destroyed mass during the reaction
c)
The reactants created matter during the reaction
d)
The gas that was produced was not able to be weighed since the container was open.
28.
Suppose a reaction were to happen in an open container in a lab. During the reaction, the scientist observes the chemicals bubble, and produce a gas. During the analysis the scientist notices that the reactants weighed 20 g when he started, and the product weighed 18 g. Explain what happened.
a)
His chemical reaction defied the law of conservation of mass
b)
The product destroyed mass during the reaction
c)
The reactants created matter during the reaction
d)
The gas that was produced was not able to be weighed since the container was open.
29.
If four hydrogen atoms react with two hydrogen atoms, how many atoms will be in the product?
a)
6
b)
4
c)
8
d)
2
30.
Since gasses weigh nothing, when they are produced in a reaction they do not have to be accounted for.
a)
True
b)
False
31.
10 g of a solid chemical reacts with a 10 g of a liquid chemical, the reaction bubbles and changes the color of the liquid. The colored liquid weighs 13 g, what can be concluded?
a)
The gas produced from the bubbles weighed 5 g
b)
The bubbles were evidence of 7 g of matter being destroyed
c)
The gas produced weighed 7 g
d)
The gas produced weighed 13 g
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