Physical Reactions
The name of the phase change from Liquid to Gas
What is Evaporation
This particle is found in the center of an atom and has a positive charge.
What is a proton?
This state of matter has a definite shape and volume
What is a solid?
What is the formula for density?
What is mass divided by volume (D = M/V)?
This type of reaction releases heat
What is an exothermic reaction?
The kind of change produced from burning wood.
What is a chemical change?
Atoms are mostly made of this.
What is empty space?
This state of matter has no definite shape and takes the shape of its container
What is a liquid?
An object that sinks in water is (more/less) dense than water.
What is more dense?
This type of reaction absorbs heat.
What is an endothermic reaction?
In a chemical change, the substances at the end are called this.
What are products?
This particle orbits around the nucleus of an atom.
What is an electron?
In this state of matter, the particles move very fast and are spread far apart.
What is a gas?
If an object has a mass of 100g and a volume of 25cm³, what is its density?
What is 4 g/cm³?
Melting ice is an example of this kind of reaction.
What is an endothermic reaction?
Name one sign that a chemical change has occurred.
What is a color change / gas production / temperature change / light produced?
What do you call two or more atoms chemically bonded together?
What is a molecule?
Changing a solid to a gas without becoming a liquid is called this.
What is sublimation?
If two objects are the same size but one is heavier, which has greater density?
What is the heavier one?
Burning a candle is an example of this type of reaction.
What is an exothermic reaction?
True or False: Freezing water into ice is a chemical change.
What is false?
Name all three subatomic particles in an atom.
What are protons, neutrons, and electrons?
Name the state of matter found in stars
What is plasma?
What would happen to an object with a density of 0.8 g/cm³ if placed in water?
What is it would float?
In an exothermic reaction, the temperature of the surroundings (increases/decreases)
What is increases?