Joe dissolves 20 g of salt in 100 mL of water. The solution is heated to speed evaporation. When the water evaporates, how much salt will be left?
20 g
100
A student adds 1 spoon of solid into 25 mL of water. The solution is clear with nothing on the bottom of the cup. The mass of the solution is 35 mL. What is the mass of the solid that was added?
10 g
100
Which 3 of the following are not attracted to a magnet or a good conductor electricity?
wood
iron
glass
paper
wood, glass, paper
100
Define mixture.
2 or more substances combined.
Teacher approves.
200
Matter can alter its form through a chemical change or through a physical change. No matter what the type of change is, every time matter alters its form, the amount of matter
is the same
200
Mrs. Johns mixed some water and 50 kilograms of concrete. Once the concrete dried, the mass was 125 kilograms. What was the mass of the water?
75 kilograms
200
A student places 95 grams of water and 120 grams of ice into a beaker. Which of the following is the best prediction for the mass of the contents of the beaker after the ice has melted into the water?
215 grams
200
If you mix sugar and water, what evidence shows you that the sugar is still there?
You can taste the sugar.
Teacher approves.
200
Which of the following would be best to help sort paper clips and rocks?
coffee filter, magnet, water, all three
magnet
300
List two substances that would fit the following criteria:
Physical state: solid
Soluble in water: no
Magnetic: no
sand, dirt, anything as long as teacher approves answer
300
Based on the chart, which sample fits the following criteria:
Is magnetic, conducts electricity, mass greater than 10 g
Sample 2
300
Mrs. Box placed a beaker of water in a window for 3 weeks.
Week 1 the volume of water was 200 mL. Week 3 the volume was 75 mL. What volume of water was converted to water vapor that entered the air over the 3 week period?
125 mL
300
List 5 properties of this container
plastic, white, can melt, fillable, water proof, container-like, any other property that the teacher approves
300
A student adds 6 spoons of solid into 55 mL of water. The solution is clear with nothing on the bottom of the cup. The mass of each spoon is 8 g.
After the water evaporates, what is the mass of the solid remaining?
48 g
400
When melting an ice cube, list the 3 properties of the matter that changed:
Changed from a solid to a liquid, changed shape, temperature changed
400
What would you expect the bar graph to look like that represents substances that have been melted from a solid to a liquid? Explain why.
The bars would be the same height because the amount of matter would be the same even though the state has changed. Teacher approves
400
A student adds 4 spoons of solid into 55 mL of water. The solution is clear with nothing on the bottom of the cup. The mass of each spoon is 6 g. What is the mass of the solution?
79 mL
400
Based on the chart, which substance meets the following criteria:
A black mineral that leaves a dark gray streak behind.
Graphite
400
What does salt look like once they have been in a solution of water and the water evaporates out?
square shape or crystal like
teacher approves
500
Define chemical change and give 4 examples of chemical changes.
A change in which a new substance is formed. Teacher approves answers.
500
Based on the chart, which would most likely be considered a metal?
A solid with poor heat conduction.
A shiny non-malleable material.
A material with low density and a good heat conductor.
A ductile solid with good heat conduction.
A ductile solid with good heat conduction.
500
A student adds 6 spoons of solid into 55 mL of water. The solution is clear with nothing on the bottom of the cup. The mass of each spoon is 8 g. What is the mass of the solution?
What would the equation be to solve this problem?
(6x8) + 55
48 + 55 = 103
Teacher approves
500
CHART
A student mixed an unknown substance with water. The substance was soluble in water and did not react with vinegar. Which type of powder did the student use?
Talcum
500
A student mixes 20 g of baking soda with 45 mL of vinegar. The vinegar and baking soda react and bubbles form. Which of the following best explains why the final product of this reaction has a mass less than 65 g?
In every chemical reaction, some of the matter is always destroyed.
The vinegar fills in the spaces between the particles of the baking soda.
The bubbles are a gas that represents matter that has escaped.
The baking soda is denser than the vinegar and it settles to the bottom.
The bubbles are a gas that represents matter that has escaped.