Explain what matter is AND name the three states of matter.
Matter is anything that has mass and takes up space. The 3 states of matter are solid, liquid, and gas.
100
If a bike left outside in the rain makes the bike rusty. Is rust a physical or chemical change and why?
Rust is a chemical change because the bike cannot be changed back to not being rusty. (The bike has undergone a change in composition.)
100
A type of reaction where a NEW substance is formed. The new substance has different properties from those of the reactants.
What is a chemical reaction?
100
Matter is made up of tiny particles that have mass and take up space.
What are atoms?
200
Particles vibrate in place, has a definite shape, and definite volume.
What is a solid?
200
What are TWO ways that a gas is different from a solid?
1. A gas has particles that are moving very fast. 2. A solid has particles that are vibrating. 3. A solid has a definite shape that cannot change. 4. The gas particles are far apart and the solid particles are very close together.
200
When water freezes to make ice is this a physical or chemical change? Why?
This is a physical change because the water is changing its state of matter; it is changing from a liquid to a solid.
200
Copper, gold, oxygen are all examples of this.
What are elements?
200
Density, shape, state, hardness, and conductivity are examples of this.
What are physical properties?
300
Mrs. Farren boiled water and steam was seen coming off the top. These are the two states of matter that were observed in this experiment.
What is liquid and gas?
300
What are two ways that states of matter (solid, liquid, gas) are all similar?
-They are all made of particles. -They all have mass. -They all have volume.
300
A piece of paper was rolled up into a ball. Is this a physical or chemical change and explain your answer?
This is a physical change because a new substance is not formed; it is just changing shape. There is no new odor, color or other reaction that is occurring.
300
Salt (NaCl), water (H2O), and iron sulfide (FeS) are examples of this.
What are compounds?
300
This is the formula for density.
What is mass divided by volume?
400
The point at which as a substance changes from a solid to a liquid?
What is melting?
400
Is oxygen O2 an atom or a molecule? Give one reason for your answer.
It is a molecule. O2 is more than two atoms that are chemically bonded together, which forms a molecule.
400
What are three examples of chemical change properties?
They are odor, a new color, creates bubbles, a new substance is formed.
400
This is a substance that cannot be broken down into a simpler substance, made up of only 1 type of atom.
What are elements?
400
To measure the volume of a rock, the lab tool used would be this.
What is a graduated cylinder?
500
This occurs when a few particles of water are moving fast enough to break free AT THE SURFACE and become gas.
What is evaporation?
500
Is NaCl (salt) a molecule, compound, or both? Give a reason for your answer.
It is both. A molecule is two or more atoms that are chemically bonded. A compound is molecule made up of more than one type of element chemically bonded.
500
Is lighting a match a physical or chemical change? Explain your answer?
Lighting a match is a chemical change because there is a new odor, a change of color, and the burnt match cannot change back.
500
An example of this could be salt (NaCl) or oxygen (O2).
What is a molecule?
500
Which has a greater mass, a metric ton of bricks or a metric ton of feathers?
Neither, they have the same mass - one metric ton.