What is the atomic number of silver (Ag)?
47
Which side are the metals and non-metals located on a periodic table?
metals - left of the step later
non-metals - right of the step later
What does a balanced and unbalanced force mean?
balanced - at rest (not moving)
unbalanced - in motion (unequal forces causing motion)
Which of the following graphs represents an object at rest?
A
Describe the particles in a more dense object.
Close together
Elements in the same period have what in common?
Number of energy levels/shells
How many atoms atoms of each element are in acetic acid (C2H4O2)
Carbon - 2 Hydrogen - 4 Oxygen - 2
Person A pulls a rope to the left with 45 N of force. Person B pulls the same rope to the right with 60 N of force. What is the net force applied to the box?
15 N right
Which of the following graphs represents an object moving at a constant speed forward?
B and F
What is kinetic and potential energy?
kinetic - energy in motion
Potential - stored energy (relative to height)
Number of valence electrons (reactivity & chemical properties)
Describe the physical properties of metalloids.
Properties of both metals and nonmetal and are semiconductors.
A ball is thrown and moves forward about 28 meters in 4 seconds. What is its speed in meters per second?
7 m/s
Which of the following graphs represents an object moving at a constant speed back to their original starting point?
C
What is the density of an unknown object with a mass of 7g and a volume of 15ml? Round to the nearest 2nd decimal.
0.47 g/ml
How many protons, neutrons, and electrons does an atom of potassium (K) have?
19 protons, 20 neutrons, 19 electrons
Name the 5 evidences of a chemical change.
Precipitate, Energy change, Color change, Bubbles (gas), Smell (odor), AND light (extra credit)
What is the difference between speed, velocity, and acceleration?
Speed - distanced traveled over a period of time. Velocity - distance with time. Acceleration - change in speed/velocity
Which of the following graphs represents an object accelerating and decelerating?
D and E
most potential - top of the rollercoaster
most kinetic - near the bottom
How many energy shells/levels and valence electrons does an aluminum (Al) have?
3 energy shells/levels and 5 valence electrons
How many total atoms are in the following molecule 5Al2(SO4)3
85 total atoms
After an object is pushed what forces act on it to change its motion? Describe its motion after it's pushed.
The applied force causes the box to move. Friction is the opposing force that causes the box to slow down and stop.
What is Newton's 1st, 2nd, 3rd Law?
1st - Inertia, 2nd - F=ma, 3rd - For every action there is an equal and opposite reaction.
What types of energy are involved in driving a car?
chemical (gas), electrical (ignition), and mechanical (movement)