Physical Science Semester test- Winter 2021

A sample that is used for comparison and is treated exactly like the other experimental groups except that the independent variable is not applied to it is a(n)

• Observation

• Variable

• Control

• Hypothesis

Scientists use prior knowledge to_________

• Collect data

• Make predictions about what will happen

• Analyze their data

• Serve as a control in their experiments

________ is the process of obtaining information by using the senses. There are two types: Qualitative and Quantative.

• analyze
• inference
• observation
• hypothesis

What type of mixture separates upon standing?

• Solution
• Alloy
• Colloid
• Suspension

In a ______________, one substance is dissolved in another substance.

• solution

• suspension

• colloid

Chewing food to break it down into smaller particles represents a _________ change, but the changing of starch into sugars by enzymes in the digestive system represents a ___________change. 

• Chemical then Physical 
• Physical then Chemical
• Both Physical
• Both Chemical

Liquid has a definite ___________, but a variable _____________.

• shape, volume
• mass, area
• smell, taste
• volume, shape

The relationship of which two variables are compared in Boyle's Law?

• pressure & volume
• volume & temperature
• temperature & pressure
• volume & moles (amount of gas)

Which of these phase changes does NOT involve changing a liquid into a gas?

• Sublimation

• Vaporization

• Evaporation

• Boiling

The number of neutrons in an atom equals the

• Mass number minus atomic number

• Atomic number plus number of electrons

• Mass number plus atomic number

• Atomic number minus mass number