Balancing and Conserving
In the equation: 2MgSO₄ → 2Mg + 2SO₄, how many oxygen atoms are on the left side?
8
Where do you plot the independent variable on a graph?
On the x-axis.
What kind of reaction releases energy to the surroundings?
Exothermic
Which of the following is a molecule but not a compound?
a) O₂
b) H₂O
c) NaCl
O₂
Which subatomic particle has a positive charge?
Proton
In a chemical equation, what do you read the → symbol as?
Yields
Where do you plot the dependent variable on a graph?
On the y-axis.
What type of reaction absorbs energy from the surroundings?
Endothermic
How many total atoms are in the compound C₆H₁₂O₆?
24 atoms (6 carbon, 12 hydrogen, and 6 oxygen)
Which subatomic particle has a negative charge?
Electron
What does the Law of Conservation of Mass state?
Matter is neither created nor destroyed during a chemical reaction.
If your graph shows how the amount of water affects the height of a plant, which variable would be plotted on the x-axis?
The amount of water.
Which of these is an example of an exothermic reaction?
a) Photosynthesis
b) Fire burning
c) Baking bread
Fire burning
Who is credited with creating the Periodic Table of Elements?
Dmitri Mendeleev
How do you calculate atomic mass?
What is the difference between an open and closed system?
An open system allows matter and energy to exchange with the surroundings, while a closed system does not.
If your graph shows how time affects the height of a plant, which variable would be the independent variable?
Time
Which of these is an example of an endothermic reaction?
a) Freezing water
b) Baking soda reacting with vinegar
c) Iron rusting
Baking soda reacting with vinegar
What does the atomic number of an element represent?
The number of protons in an atom.
Protons
Balance the following equation:
CH₄ + O₂ → CO₂ + H₂O
CH₄ + 2O₂ → CO₂ + 2H₂O
What is an appropriate title format for a graph showing that temperature increases reaction rate?
"The Effect of Temperature on Reaction Rate."
Which of the following is an example of an endothermic reaction?
a) Melting ice
b) Burning wood
c) Freezing water
d) Condensation of steam
Melting ice
Atoms; molecule
What two subatomic particles attract to one another?
Protons and electrons