Solubility
Density
Atoms
Chemical and Physical Changes
Scientific Method
100
A) What does it mean if a solution is saturated?
It is full of solute and cannot dissolve any more.
100
F) What is the formula for density?
Density = mass / volume
100
K) What is the name of the chart that organizes the elements?
The periodic table of the elements
100
P) What are 2 things that might occur in a chemical reaction?
Smoke, fire, explosions, color change, temperature change, bubbles
100
U) The best guess answer a scientist makes to a scientific question is called a _________
Hypothesis
200
B) What does it mean if a solution is unsaturated?
It still has the ability to dissolve more solute
200
G) What are the units for density?
Grams / Mililiter
200
L) What charge does an electron have?
Negative
200
Q) You mix together potassium and water to create hydrogen gas and potassium hydroxide. Is this a physical or chemical change and why?
Chemical change because a new molecule is made
200
V) The parts of your experiment that you keep the same to ensure fairness are called (independent variables, dependent variables, constants)
Constants
300
C) What does it mean if a solution is supersaturated?
It cannot dissolve any more solute and extra solute is at the bottom.
300
H) If water has a volume of 20 mL and a mass of 20 mL, what is its density?
1 g/mL
300
M) What is the name of the positively charged subatomic particle?
Proton
300
R) You mix ice with soda and you notice bubbles form. Is this a chemical reaction or a physical change and why?
Physical change because bubbles are normal in soda. Nothing new is made. The chemicals are still the same in ice and soda.
300
W) The part of the experiment you measure is called (independent variable, dependent variable, or constant)
dependent variable
400
D) If you make a saturated solution with mass of 90 grams, your water weighs 50 grams, and your beaker weighs 10 grams, how much solute dissolved?
30 grams
400
I) If a beach ball has a mass of 40 grams and a volume of 400 mL, what is its density?
0.1 or 1/10 g/mL
400
N) Fluourine has atomic mass of 19 and atomic number 9. How many protons does it have?
9
400
S) You mix a red liquid with yellow powder, which makes an orange liquid. Is this likely a physical change or chemical reaction? Why?
Likely physical change because the color change is not unexpected.
400
X) The part of the experiment that you choose to change to test your scientific question (independent variable, dependent variable, or constant)
Independent variable
500
E) Describe why more solute can dissolve in hot water than cold water.
When water heats up, its molecules move further apart, creating more space for the solute molecules.
500
J) If a shoe has a density of 1.8 g/mL and water has a density of 1 g/mL, will the shoe float or sink?
It will float
500
O) Fluorine has an atomic mass of 19 and atomic number 9. How many neutrons does it have?
10
500
T) You mix red liquid with white powder and get neon green liquid. Is this likely a physical or chemical reaction? Why?
It is likely a chemical reaction because there was an unexpected color change, so something new was likely made.
500
Write your own scientific question (remember: feasible and safe)
Answers will vary
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