Show:
Counting Atoms
Physical and Chemical
Forces
Speed, Velocity, Acceleration
Atoms and Periodic Table
100
How many atoms are in this formula? 2H2O
6
100
True or False, a physical change creates a new substance?
False
100
True or False, an unbalanced force causes a change in motion?
True
100
What is the equation for Speed?
S = d/t
100
What inside an atom tells you the identity of the atom?
# of protons
200
How many elements are in this formula? 2MgO2
2
200
True or False, changing the state of matter is evidence of a chemical change?
False
200
What is the net Force being applied to the $$$? 10N --> $$$ 6 N <---
What is 4 N -->
200
Give me the definition for velocity?
Speed in a given direction
200
What tells you the chemical properties of an atom, whether its reactive or not?
# of valence electrons
300
In a chemical equation, the reactants are on the left side of the arrow or the right side?
Left
300
Name 3 evidences of a chemical change?
Fire, bubbles / gas being released / odor, color change, precipitate forms, temperature change
300
If I have two balls, one 10 kg and the other 20 kg, what would happen if I kicked both balls with the exact same force?
The 10 kg ball will travel twice as fast and twice as far
300
a ball rolls 21 meters in 7 seconds. what is its speed?
What is 3 m/s
300
How many protons and valence electrons does Aluminum, Al, have?
13 protons 3 valence electrons
400
Explain what it means for an equation to be balanced as opposed to an unbalanced equation
A balanced equation is where you have the same amount of atoms of each element on the reactant side as you do on the product side
400
Define what a precipitate is?
When you mix liquids together and a solid forms because of the chemical reaction
400
Explain the difference between potential and kinetic energy?
Potential energy is how much potential an object has to create energy, the higher an object, the more potential it has. A rubber band pulled back farther has more potential energy Kinetic energy is energy in motion. The faster the object is traveling, the more kinetic energy it has
400
What is the definition of Acceleration?
Any change in speed or direction
400
Unsaturated fat is an organic compound. What elements make the compound organic?
Carbon, Hydrogen, Oxygen
500
In this following unbalanced equation, how many atoms are in the hydrogen molecule? 4Fe + H4 ----> 4FeH2
4
500
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence of a chemical reaction when coal burns? A - The shape of coal changes B - Oxygen is present C - A new substance is produced D - Coal is made up of more than one element
C - A new substance is produced
500
Work = Force x Distance Explain why no work is being done even if you are holding up a really heavy object that weighs 50 N for 5 minutes straight.
If no distance is being traveled, it doesn't matter how heavy it is. 50 x 0 = 0
500
Mr. Boyd is riding his bike at a park. This is what his bike path looks like. If Mr. Boyd travels at a constant speed of 10 mph, is it possible to have acceleration? If he is traveling at a constant speed of 10 mph on this track, is his force balanced?
1st part, yes. He is changing direction 2nd part, yes. No change in motion
500
Elements in the same period have the same _______ and elements in the same Group have the same ________
energy shells, and valence electrons