Matter
Pure Substances and Mixtures
Physical and Chemical Change
Measuring Matter
Miscellaneous Matter
100
Is air matter? Explain why or why not.
Air is matter because it has mass and takes up space.
100
Gold is found on the periodic table of elements. Therefore it is an _______________.
Element
100
Is melting ice a chemical or physical change? How do you know?
Melting ice is a physical change. You know because it is still H20 and nothing new was created.
100
What is mass and what is the SI unit for measuring mass?
Mass is a measure of the amount of matter in an object. The SI unit for mass is gram.
100
Liquid A has a density of 4.7g/ml. Liquid B has a density of 2.4g/ml. What will happen when both liquids are poured into a test tube?
If a solid object as added to the tube that had a density or 1.5g/ml, where would it land in the tube.
Liquid A will sink to the bottom and liquid B will float on top of liquid A.
A solid object with a mass of 1.5g/ml would float on both liquids because it is less dense than either of the liquids.
200
Define matter.
Matter is anything that had mass and take up space.
200
Define homogeneous mixture and heterogeneous mixture. Give an example of each.
Homogeneous mixtures look the same throughout. Kool-aid is an example. In heterogeneous mixtures, you can see the different parts. Salad is an example.
200
Is rust on a nail a chemical or physical change. How do you know?
Rust is a chemical change because it is two substances (iron and oxygen) reacting to form a new substance (iron oxide).
200
What is volume and what is the SI unit for measuring volume. (Hint, there are TWO.)
Volume is the amount of space matter takes up. The SI unit for volume is cm3 or ml - depending on if you measured it with the formula volume = length X width x height or if you measured it with a graduated cylinder.
200
What happens in an endothermic reaction? How would it feel? What would happen to the temperature of the reaction over time?
An endothermic reaction is a reaction that absorbs heat from it's environment. These will make the surrounding area feel cold. The temperature would go down.
300
What is an atom? What is an element? How are they different?
An atom is the smallest piece of matter that retains its properties. An element is two or more of the same atom bonded together.
300
Is water an atom, element, compound or mixture? How do you know?
Water is an compound because it is made of two or more different atoms that are chemically bonded together.
300
Give an example of a physical change and an example of a chemical change. Explain the difference.
Heating dry ice into carbon dioxide gas is a physical change. Mixture baking soda and vinegar to create sodium acetate, water and carbon dioxide is a chemical change. The difference is that in a physical change, nothing new is created. In a chemical change new substances are created.
300
What is density and what is the formula for measuring density? What is the unit?
Density is a measurement that compares the amount of matter in an object to it's volume. The formula is density = mass/volume. The unit is g/ml.
300
What happens during an exothermic reaction? How does it feel? What would happen to the temperature over time?
An exothermic reaction is an chemical reaction that releases heat. It will make the surrounding environment feel warmer. The temperature would go up.
400
Matter is defined as anything that has ______________ and _________________.
Mass and volume
400
What is the difference between a pure substance and a mixture? What are two kinds of pure substances? What are two types of mixtures?
Pure substances are have the same composition throughout. Mixtures have different compositions throughout.
Elements and compounds are pure substances. Homogeneous and heterogeneous are two types of mixtures.
400
You can usually remove tarnish from a silver with baking soda or toothpaste. Does that tell you what kind of change it is?
It does not! Although we say that physical changes can often be reversed, chemical changes can also be reversed with another chemical reaction. That is the case for removing tarnish. A chemical reaction causes silver to tarnish and a separate chemical reaction removes the tarnish.
400
If the density of 100ml of water is 1g/ml, what is the density of 200mls of water?
The density of 200mls is also 1g/ml. Density does not change with volume.
400
What does the law of conservation of matter say about matter?
The law of conservation of matter states that matter can not be created or destroyed during an chemical or physical change.
500
Give an example of something that is matter and something that is not matter. Explain the difference.
Answers will vary. Matter is anything that has mass and volume. Energy (such as heat, sound, electricity) is not matter because it does not have mass or volume.
500
Go up to the board and draw an atom, an element, and compound and a mixture.
500
Does the formation of bubbles or gas always indicate a chemical change? Why or why not?
The formation of bubbles does not always indicate a chemical change. Dry ice bubbles when put in water but that is still a physical change because the dry ice is solid carbon dioxide and the gas is carbon dioxide and nothing new was created.
500
Explain the difference between weight and mass.
Mass is the measure of how much matter is in an object and weight is the measure of the gravitational force on an object. Weight depends on mass and also location.
500
Explain what is unique about water when liquid water freezes into ice.
When liquid water freezes, it's molecules slow down and get closer together and it becomes more dense until it reaches a temperature of near freezing - about 4 degrees Celsius. At that point the molecules actually expand and it becomes less dense. This why ice will float in liquid water.