Balancing
What is a chemical equation?
description of a reaction using element symbols and chemical formulas
What is the name of a reaction in which two or more substances combine and form one compound?
What is the name of a reaction in which one compound breaks down to form two or more substances?
Synthesis, Decomposition
What is speed?
Measure of the distance an object travels per unit of time
What is the purpose of a distance-time graph
To show comparisons between two different measurements. To show how distance changes over time
What is velocity?
speed and the direction of a moving object
Which side of the reaction is the reactants?
Left
What is a single replacement reaction? What is a double replacement reaction?
One element replaces another element in a compound
The negative ions in two compounds switch places, forming two new compounds
What is constant Speed? What is instantaneous speed?
Constant speed is the rate of change of position in which the same distance is traveled each second
Instantaneous speed is speed at a specific instance of time
Draw a distance time graph comparing Horse A and Horse B with the following information:
Horse A: Time (2, 3, 4, 5, 6, 7) Distance (20, 40, 60, 70, 80, 100)
Horse B: Time (2, 3, 4, 5, 6, 7) Distance (15, 35, 70, 75, 90, 105)
What was the average speed of both horses?
Horse A: 14.2 m/s
Horse B: 15 m/s
What is the symbol used to represent velocity
Arrows of varying length
What is the law that states that the total mass of the reactants before a chemical reaction must equal the total mass of the products after the reaction?
Law of Conservation of Mass
What is a combustion reaction?
a substance combines with oxygen and releases energy
What is average speed?
total distance traveled divided by the total time taken to travel that distance
Calculate the average speed of a marble if its starting point was 0,0 and its ending point was 10,40
40m/10m= 4m/s
What is the difference between velocity and speed?
Speed is the distance an object travels per unit of time. Velocity is speed in a given direction
Balance this reaction:
Mg + H2O → Mg(OH)2 + H2
Mg + 2H2O → Mg(OH)2 + H2
What type of reaction is this?
NaCl + AgNO3 → NaNO3 +AgCl
Double replacement
Melisa shot a rocket 350m into the air. It took the rocket 3s to fly that far. What was the average speed?
116.7 M/S
What are the three ways an object can change velocity?
Speed up, Slow down, change direction
Balance this reaction:
C2H6 + O2 → H2O + CO2
2C2H6 + 7O2 → 6H2O + 4CO2
What type of reaction is this?
2C4H10 + 13O2 → 8CO2 +10H2O
Combustion
It takes Ahmed 35s on his bike to reach his friend's house 275m away. What is his average speed?
7.86 M/S
How can two students with the same speed have different velocities?
Walking in different directions