Physical or Chemical?
Physical
Density = mass / _______
Volume
The state where particles are packed tightly and vibrate in place.
Solid
In a chemical reaction, matter cannot be created or ___________.
Destroyed
The variable you change on purpose
Independent variable
Burning wood
Chemical
What unit is used for density: kg, g/cm3, or m/s
g/cm3
The state where particles are far apart and move fast.
Gas
10 grams of one substance reacts with 5 grams of another in a sealed bag. What is the mass of the products?
15 grams
The variable you measure
Dependent variable
Cutting paper
Physical
An object has a mass of 20g and a volume of 10 cm3. What is its density?
2 g/cm3
The change from liquid to gas.
Evaporation or boiling
What do we call a system where nothing can get in or out?
A closed system
The variables that remain the same in an experiment.
Constants or control variables.
A nail rusting
Chemical
Water's density is 1 g/cm3. Will wood with a density of 0.6 g/cm3 float or sink?
Float
The change from gas to liquid
Condensation
A reaction makes a gas in an open cup. Why does the mass go down?
A student tests how water temperature affects how fast sugar dissolves. What is the independent variable?
Water temperature
Name a sign that a chemical change happened. Bonus: What is produced?
A gas forms, an unexpected color change, a new solid forms, temperature changes, or an odor is produced. Bonus: a new substance forms.
You cut a metal block in half. Does the density of each half change or stay the same?
It stays the same.
When you add heat, do particles move faster or slower?
Faster
During a chemical reaction, atoms are __________ to form new substances
Rearranged
A student tests how water temperature affects how fast sugar dissolves. What is a control variable?
Anything other than water temperature or the time the sugar takes to dissolve. Example: amount of water, amount of sugar, etc.