Properties
Changes
Mixtures
Labs/Activities
100
Blue color is an example of
What is a physical property?
100
An apple is left out and rots. What 2 indicators would tell us that a chemical change occurred?
-Change in color
-Smell
100
Provide one example of a mixture.
Answers will vary. Examples include: salt water, sugar water, coffee, fruit salad, a smoothie, colors in a marker.
100
What property of matter caused the oil to sit on top of the water in the lava lamp lab?
Density
200
Some substances have a reaction when combined with HCl (acid). This is considered a ____________ property.
What is chemical property?
200
A student puts three drops of green food coloring into salt water. What type of change occurred?
What is a physical change?
200
How many different substances are in this mixture? 
What is 2?
200
Describe 2 different types of changes that occurred during the smores lab.
Chemical: burning marshmallow, digestion
Physical: melting chocolate, breaking graham cracker, chewing
300
A student is performing an experiment with baby powder. The student notes that the powder is soft, white, and smells good. In this example, smell is a...
Physical property
300
List at least two examples of chemical changes that we observed in class.
-Hand warmers (temp change)
-Glow sticks
-Iodine changing black when reacting with starch
-Vinegar and baking soda bubbles
-Marshmallow burning
300
Why is air considered a mixture?
Air is made up of several different compounds and molecules such as CO2, H2O, N2, and O2.
300
Calculate the density of the following:
A cube has the following dimensions: 3cm by 5 cm by 6 cm. The cube also has a mass of 100g. What is the density of the cube?
The cube has a density of 1.11 g/cm3
400
Sal is given a sample of an unknown liquid to test in the laboratory. Sal thinks the liquid might be water. Which physical properties would be helpful for Sal to determine the identity of the liquid?
Acceptable answers:
1. Boiling point
2. Melting point
3. Density
400
We know when a chemical change has occurred when we answer yes to this important question.
Has a new substance been formed?
400
Salt and water separately are considered this.
When put together, salt water is this.
Salt and water: compounds
Salt water: mixture
400
Why is the ink in a maker considered to be a mixture?
The ink is composed of many different pigments of colors, seen when we separate the colors using water.
500
A student cooks an egg. The egg white starts out clear and turns white. In this example color is a ____________________ property that indicates that a ____________________ change occured.
physical, chemical
500
A new substance is formed during a chemical change. What remains the SAME between the original and new substance?
The original and new substance should have the same mass/matter/number of atoms. The amount of matter has not changed, it was just rearranged to form the new substance.
= LAW OF CONSERVATION OF MASS
500
Why is 70% alcohol a mixture?
70% alcohol is a mixture because 70% of it is made of alcohol molecules but the other 30% is made of water molecules. The alcohol and the water are not bonded together, just mixed.
500
What are two properties that can be used to tell water and isopropyl alcohol apart?
Time it takes to evaporate and number of drops on a penny (cohesion)