Atomic Structure
The number of valence electrons for an element.
Which symbolizes a compound?
A: He
B: Be
C: NaCl
D: N2
C: NaCl
Is Density a physical or chemical property?
Physical
Which statement about the molecules in ice vs. molecules in water is true?
A: The molecules in ice are less free to move than the molecules in liquid water
B: The molecules in ice have more electric charge than the molecules in liquid water
C: The molecules in ice have more energy than the molecules in liquid water
D: The molecules in ice contain different atoms than the molecules in water.
A: The molecules in ice are less free to move than the molecules in liquid water.
A chemical change occurs when:
A: a piece of cloth is cut.
B: A cup breaks
C: A candle burns
D: Water evaporates
C: A candle burns
Carbon-12, Carbon-13, and Carbon-14 are examples of what?
Isotopes
Which of the following is a compound?
A: Water
B: Oxygen
C: Nitrogen
D: Air
A: Water
Physical
At what temperature does water boil?
100 Degrees Celsius
What is the process by which heat energy gets to Earth from the sun?
A: Convection
B: Radiation
C: Conduction
D: Reflection
B: Radiation
What is the weight of a proton?
1 amu
What is another name for a homogenous mixture?
Which of the following is a chemical property?
A: Boiling Point
B: Volume
C: Flammability
D: Color
C: Flammability
How does heat affect particles?
It causes them to move faster
Which represents kinetic energy?
A: A salmon leaping up a waterfall
B: A bear standing in the field of berries
C: A salmon resting still in water
D: A bear holding a salmon it has caught
A: A salmon leaping up a waterfall
A bag of popcorn weighing the same before and after is is popped explains what?
The Law of Conservation of Matter
What is the difference between compounds and mixtures? Be specific.
Compounds are chemically combined. Mixtures are not chemically combined.
Which of the following gives evidence of a physical property?
A: Coke Fizzed
B: A test tube got hot
C: Sugar turned brown
D: Sugar felt grainy
D: Sugar felt grainy
Explain how particles change during deposition.
Gas to Solid: They go from free moving to being packed together and vibrating only.
What must happen to an object in order to accelerate it?
A: It must contain momentum
B: Some weight must be removed
C: Its frictional coefficient must be reduced
D: A net force must be applied
D: A net force must be applied
Which is more reactive, Chlorine or Argon? Explain how you know.
Chlorine is more reactive because it needs another electron while Argon has its highest energy level filled and is stable.
How many total atoms are in the following compound? Mg3(PO4)2
3 Mg, 2 P, and 8 O= 13 total atoms
During a Science lab, some students added small pieces of magnesium (Mg) to hydrochloric acid (HCl) Bubbles formed, the test tube got hot, and the Mg disappeared. How did they know a chemical reaction occurred? Be specific.
Moisture that collects on the outside of a cold glass results from the process of
A: Evaporation
B:Condensation
C: Sublimation
D: Vaporization
B: Condensation
Which statement BEST describes how the sound wave changes as the race car drives away?
A. The frequency increases and the amplitude increases.
B. The frequency increases and the amplitude decreases.
C. The frequency decreases and the amplitude increases.
D. The frequency decreases and the amplitude decreases.
D: The frequency decreases and the amplitude decreases