WorksheetsUnit 2 Phys. Sci.
Total questions: 30
Worksheet time: 7hrs 6mins
Which of the following is a pure substances?
Compound
Homogeneous mixtures
Colloids
Solutions
Which of the following is NOT a pure substance?
Milk
Oxygen
Water
Carbon dioxide
What is the symbol for aluminum?
Au
Aluminum
Al
AL
Water is a compound because it
can be broken down into simpler substances.
always has two hydrogen atoms for each oxygen atom.
is made of water atoms joined together.
both a and b
Which of the following is a mixture?
Carbon dioxide
Sand
Silicate dioxide
Silicon
Which of the following is a heterogeneous mixture?
Chlorinated water
Salt water
Stainless steel
Mixed vegetables
Which of the following is an example of a homogeneous mixture?
Oil in water
Water
Milk
Pizza
You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” The soy milk is most likely a
Colloid
Suspension
Solution
Heterogeneous Mixture
Physical properties can be identified by...
Multiple scientific studies
Eating the substance
Testing for chemical changes
Using observations and the five senses
Which is an example of a chemical change?
Flammability
Malleability
Conductivity
Density
What physical properties of nylon and leather make them good materials to use for shoelaces?
density
malleability
hardness
conductivity
Which of the following is a physical change?
sawing a piece of wood in half
burning a piece of wood
rust forming on an iron fence
a copper roof changing color from red to green
Which of the following is a chemical change?
ice melting
ice being carved
water boiling
water reacting to break down into hydrogen and oxygen
Which of the following is a clue of a chemical change?
iron changes color when heated
gas bubbles form in boiling water
balls of wax form when melted wax is poured into ice water
a gas forms when vinegar and baking soda are mixed
Which state of matter has a definite shape and a definite volume?
Solid
Liquid
Gas
Which state of matter has no definite shape but definite volume?
Solid
Liquid
Gas
What is the total pressure caused by the vapors in the air?
Air Pressure
Vapor Pressure
Volumetric Pressure
Torr
Decreasing the air pressure in a vacuum with peeps causes them to do which of the following?
Expand
Deflate
Nothing
What type of change occurs when water changes from a solid to a liquid?
A phase change
An irreversible change
A chemical change
Both b and c
The phase change that is the reverse of condensation is
Freezing
Evaporation
Melting
Sublimation
When a solid turns directly into a gas what is that phase change called?
Deposition
Condensation
Sublimation
Heat of Fusion
What is an example of deposition, which a gas turns directly into a solid?
Dropping sediments into a pond
Liquid nitrogen freezing a balloon
Snowflakes forming from raindrops
Snowflakes forming an a window in winter
How might an endothermic change feel?
Warm
Cold
Stays the same
Fluctuates temperature
How might an exothermic change feel?
Warm
Cold
Stays the same
Fluctuates temperature
A chemical was placed in a vacuum chamber. Pressure was decreased and the chemical began to boil. What is this an example of?
Condensation
Phase change
Chemical change
Physical change
A toy box filled to the brim with stuff would be an example of what?
Element
Compound
Heterogeneous
Homogeneous
A chemical reaction takes place by simply pouring together two chemicals. There are no color changes, gases produces, or light produced. What may be a way to tell it chemical changed? (Select all that apply)
Feel for a temperature change
Waft to identify a change in odor
Freeze it and see if it can phase change
Boil it
How might you provide evidence for a physical change?
Can be reversed
The matter remains the same
The physical properties don't change
All of the above
How might you provide evidence of a chemical change?
It is not reversible
It has new chemical properties
Something is changed or produced such as a gas
All of the above
Explain one physical and one chemical change made during your explosives lab or flame test demo.
