States of Matter
What state of matter has a definite shape and volume?
Solid
What type of change occurs when a substance changes its shape but does not form a new substance?
Physical change
What type of change produces a new substance?
Chemical change
What is the amount of matter in an object called?
Mass
What do we call two or more substances combined without forming a new substance?
Mixture
What state of matter takes the shape of its container but has a definite volume?
Liquid
Is stretching a rubber band a physical or chemical change?
Physical change
What is one possible sign that a chemical reaction has occurred?
Gas production, unexpected temperature change, light production, or formation of a new solid
A 60-gram chocolate bar is broken into four pieces. What is the total mass of all four pieces?
60 grams
What is the substance that does the dissolving in a solution called?
Solvent
What state of matter spreads out to fill its entire container?
Gas
What process occurs when water vapor cools and turns into liquid droplets?
Condensation
Two clear liquids are mixed, and a new solid forms. What type of change most likely occurred?
Chemical change
A sealed container has 120 grams of matter before a chemical reaction. What is its total mass afterward?
120 grams
What is the substance being dissolved in a solution called?
Solute
Why does a balloon shrink when placed in a cold environment?
The gas particles move more slowly, causing the gas to take up less space.
A wet sidewalk dries after the sun comes out. What process causes the water to disappear?
Evaporation
Why is an apple turning brown after being cut an example of a chemical change?
The apple reacts with oxygen, causing new substances to form.
Why might the measured mass decrease when a chemical reaction produces gas in an open container?
Some gas escapes into the air, but the matter is not destroyed.
A student mixes gravel and water. What method could separate the gravel from the water?
Filtering or straining
Why can air be compressed more easily than water?
Gas particles have more space between them than liquid particles.
A student freezes juice, melts it, and freezes it again. Why are these all physical changes?
The juice changes states of matter, but no new substance forms.
During a chemical reaction, what happens to the particles of the original substances?
The atoms rearrange to form new substances.
A sealed container holds 45 grams of liquid and 15 grams of powder. After a reaction, 10 grams of solid forms. What is the mass of the remaining products?
50 grams
A student dissolves drink powder in water. After the water evaporates, powder residue remains. Why wasn't the powder destroyed?
Dissolving spreads the powder throughout the water without destroying the matter.