#1
What is a physical property?
A characteristic of matter that can be observed or measured without changing the substance into something new.
What is a chemical property?
A characteristic that describes how a substance can react and form a new substance
Ice melts into liquid water. Is this a physical or chemical change?
Physical change
What is a mixture?
Two or more substances combined without forming a new substance.
What does it mean when a substance is soluble in water?
It means the substance can dissolve in water
Color, shape, length, mass, texture, hardness
Is the ability to burn a physical or chemical property?
Chemical
A piece of paper is cut into small pieces. Has a new substance formed?
No. It is a physical change because only the size and shape have changed.
What is a homogenous mixture?
A mixture that is evenly mixed throughout and has the same composition throughout.
When sugar dissolves in water, which substance is the solute?
Sugar
A student observes that a rock is rough, gray, and hard. Are these physical or chemical properties?
Physical
Iron can react with oxygen and moisture to form rust. What chemical property does this demonstrate?
Iron's ability to react with oxygen and moisture
Chemical change because the iron reacts with oxygen and moisture to form rust.
What is a heterogenous mixture?
A mixture that is not evenly mixed throughout and may have visibly different parts.
When salt dissolves in water, what is the solvent?
Water
What is the difference between mass and volume?
Mass is the amount of matter in an object. Volume is the amount of space an object takes up.
A student says flammability is a physical property because you can see a flame. Why is the student incorrect?
Flammability is a chemical property because burning involves a chemical reaction that forms new substances.
A student mixes two substances, and the mixture changes color and produces gas. What might this indicate?
A student mixes sand and water. The sand settles at the bottom. Is this a homogenous or heterogenous mixture? Explain why.
Heterogenous because the sane and water are not evenly mixed, and the different parts can be identified.
A student stirs sand into water, but the sand settles at the bottom. Is the sand soluble in water? Explain why.
No. Sand is insoluble in water because it does not dissolve.
Two objects are the same size, but one is heavier than the other. Name one physical property that could help explain the difference.
Mass
What is the main difference between a chemical property and a physical property?
A physical property can be observed or measured without forming a new substance, while a chemical property describes how a substance can react to form new substances.
A candle's wax melts while the wick burns. Identify both changes and explain your answer.
Melting wax is a physical change because the wax changes state. Burning the wick is a chemical change because it reacts with oxygen and forms a new substance.
A student mixes salt into water until the salt dissolved completely. The mixture looks the same throughout. Is it homogenous or heterogenous? Explain why.
Homogenous because the dissolved salt is evenly distributed throughout the water.
Two students each stir a spoonful of a different substance into separate cups of water. The sugar dissolves, but the sand does not. Explain the difference between the two substances.
Sugar is soluble in water, while sand is insoluble. They have different solubility properties.