Chemical Reactions
List at least three things that are evidence of a chemical reaction occurring.
temperature change
color change
gas is released (bubbles)
precipitate forms
odor
Does the mass change in a chemical reaction?
No, the mass stays the same before and after a chemical reaction.
What are the 3 reactants of photosynthesis?
sunlight (radiant energy)
water
carbon dioxide
What type of energy is made during cellular respiration?
ATP
What rock is formed when particles of other rocks are deposited in layers and cemented together?
Sedimentary Rock
What is it called when a solid is formed during a chemical reaction?
precipitate
What is the number called BEFORE an atomic symbol in a chemical equation and what does it mean?
coefficient
the number of that molecule
What are the two products of photosynthesis?
glucose
oxygen
What speeds up a chemical reaction?
an enzyme
What rock is formed when lava or magma cools, forms crystals, and solidifies?
Igneous Rock
Fill in the blanks for the correct vocabulary in a chemical reaction:
______ + _________ = _________
reactant + reactant = product
What is the small number after an atomic symbol called and what does it mean?
subscript
It tells the number of that atom present
Where in the cell does photosynthesis happen?
chloroplasts
Describe how cellular respiration relates to photosynthesis?
cellular respiration uses the products of photosynthesis and makes the reactants of photosynthesis.
What rock is formed deep underground due to heat and pressure?
metamorphic rock
What happens to the temperature in an endothermic chemical reaction?
What happens to the temperature in an exothermic chemical reaction?
endothermic: temperature goes down
exothermic: temperature goes up
What is the difference between an open and closed system?
An open system can exchange energy and matter with it's surroundings.
What type of energy comes from the sun and what does the plant turn it into?
Radiant energy becomes chemical energy.
Where in a cell does cellular respiration occur?
mitochondria
What is a cycle?
A repeated sequence of events.
What is the difference between an endothermic and exothermic chemical reaction?
endothermic reactions absorb heat and exothermic reactions release heat.
Is this equation balanced or unbalanced?
N2 + 6H2 -> 2NH6
Yes, there are 2 Nitrogen atoms on each side and 12 hydrogen atoms on each side
Write the chemical equation for photosynthesis
6CO2 + 6H20 + energy = C6H12O6 + 6O2
What were the three categories of food molecules you modeled digestion with? Think of the puzzle pieces
carboydrates
lipids
proteins
physical changes