Photosynthesis
What is the process that plants use to make their own energy?
Photosynthesis
The number of protons and the number of electrons in an atom
A hydrogen atom is made of one proton and one electron. The proton and electron stay near each other because
Positive and negative charges attract
Which best describes a physical change?
A change of matter ____
a) that makes the molecules different
b) that only affects the physical properties of matter
c) where new matter is created
B) A change of matter that only affects the physical properties of matter
In a balanced equation:
a) there are more atoms on the reactants side
b) reactants are equal to the products
c) there are more atoms on the products side
B) reactants are equal to the products
The energy source that allows plants to perform photosynthesis is
The sun allows plants to perform photosynthesis.
Look at your Periodic Table of Elements.
Calculate the number of neutrons in a Boron atom.
There are 5 neutrons in a Boron atom.
When you add energy (heat) to a solid, this happens to the molecules
They move faster
A chemical change is
a) any change that affects the physical state but not the molecules
b) a change of matter that makes it into a new type of matter
c) when matter is added to other matter
B) a change of matter that makes it into a new type of matter
What is the correct chemical formula for photosynthesis?
a) 6CO2 + 6H2O + light --> C6H12O6 + 6O2
b) 6CO2 + 6O2 + light --> C6H12O6 + 6H2O
a) 6CO2 + 6H2O + light --> C6H12O6 + 6O2
6 CO2 + 6 water + light --> sugar + 6 oxygen
Light energy is converted to glucose through the process of
Photosynthesis
Look at your Periodic Table of Elements.
Calculate the number of protons in a Calcium atom.
There are 20 protons in a Calcium atom.
Neutrons are in the nucleus of the atom. A neutron has what kind of charge?
No charge
The following example demonstrates what kind of change? Physical or chemical change
Milk that has gone bad
Milk that has gone bad is an example of CHEMICAL change
What happens during an endothermic reaction?
a) energy flows out of the reaction, releases thermal energy, and feels hot
b) energy flows into the reaction, absorbs thermal energy, and feels cold
B) energy flows into the reaction, absorbs thermal energy, and feels cold
What are the 3 reactants of photosynthesis?
Water, CO2, energy (sun/light)
Look at your Periodic Table of Elements.
Which atom has the most orbital shells?
Silver (Ag)
Calcium (Ca)
Boron (B)
Silver has the most orbital shells.
An electron is in a region outside the nucleus. Fill in the blanks:
An electron has ________ mass than a proton and has a _____ charge.
An electron has less mass than a proton and has a negative charge.
Which object will float in water?
a) an object with a greater density than water
b) an object with a density less than water
c) any small object no matter what it's mass
B) an object with density less than water
If a chemical equation is unbalanced, how do you balance it?
Add atoms to each side of the equation until both sides have the same number of atoms per element.
What are the 2 products of photosynthesis?
Sugar (glucose) and oxygen
True or False
The molecules in a solid are very far apart, move quickly, and are not touching.
False
What are the 3 main states of matter? Provide an example for each
Solid, liquid, gas
Example:
solid = ice
liquid = water
gas = steam
Give me an example of a chemical change.
Examples include:
Milk that has gone bad
Digesting pizza
Use the chemical equation below to answer the question. How many atoms of each element are present on each side of the equation?
C4H10 + O2 --> H2O + CO2
C (Carbon) = Reactants- 4 Products- 1
H (Hydrogen) = Reactants- 10 Products-2
O (Oxygen) = Reactants- 2 Products- 3