Measurements and Conversions
How many meters are in 1 kilometer?
1,000 m
What is the equation used to calculate density?
p= m/V
Is melting ice a physical change or a chemical change?
Physical change
A scientist changes the amount of light a plant receives and measures how much the plant grows.
What is the independent variable?
Amount of light
What are the three common states of matter?
Solid, liquid, and gas
Convert 8.2km to m (show work and correct units)
8,200m
A marble has a mass of 10 g and a volume of 20 mL. What is its density?
0.5 g/mL
Is burning wood a physical change or a chemical change?
Chemical change
A scientist changes the amount of light a plant receives and measures how much the plant grows.
What is the dependent variable?
Plant Growth
Which state of matter has particles that are closest together and generally vibrate in fixed positions?
Solid
Convert 78g to kg (show work and correct units)
0.078kg
An object has a mass of 50 g and a volume of 112 mL. What is its density?
0.446 g/mL
What is a physical change?
A change in matter that changes its form or appearance but does not create a new substance.
What is a constant variable?
A variable that is kept the same for every experimental group.
As a substance changes from a liquid into a gas, what happens to the distance between its particles?
The particles get farther apart.
Convert 70 mL to L (show work and correct units)
0.07L
Aluminum has a density of 2.7 g/mL. What is the mass of 20 mL of aluminum?
54 g
What is a chemical change?
A change in matter that produces one or more new substances with different properties.
A scientist changes the amount of light a plant receives and measures how much the plant grows. Give TWO constant variables that could be used in the experiment.
You are heating water in a pan. What phase change occurs as liquid water becomes water vapor?
Evaporation
Convert 1.8L to mL (show work and correct units)
1,800mL
You have four liquids with densities of 1.38, 0.93, 1.20, and 1.10 g/mL.
What would be the order of the liquids from bottom to top?
1.38, 1.20, 1.10, 0.93 g/mL
A student cuts a piece of paper into several smaller pieces. Another student burns a piece of paper.
Which one is a physical change and which one is a chemical change? Explain why.
Cutting the paper = physical change because no new substance is created.
Burning the paper = chemical change because new substances are produced.
Design an experiment with an independent variable, a dependent variable, and two constant variables.
Answers vary
In a particle diagram comparing liquid water and water vapor, what TWO things should be different about the particles?
1. Different spacing — gas particles are farther apart.
2. Different line/motion representation — gas particles are shown with greater/random motion compared with the more constrained liquid particles.