How do we get energy from the sun?

From stored energy in bonds of molecules like sugar.

What effect would changing the pH from 2.0 to 5.0 have on the activity of the peroxidase?

It would increase the activity.

The elements in the carbon group

have 2 electrons in the p orbital.

How is the heat energy from the sun stored in organic molecules?

In chemical bonds of carbon molecules

Which equation is balanced?

a. C6H12O6 + 6O2 → 6CO2 + 6H2O

Which is true of exothermic reactions?

energy of reactants > energy of the products

What is the purpose of photosynthesis?

Light energy is stored in a useable form.

If heat is released by a chemical reaction,

Some energy is released to surroundings

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Reactions Applications

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Questions 25

Answers

1
Lactase helps digest lactose in the
stomach.
liver.
small intestines.
mouth.
2
Which is NOT a problem with combustion?
Not enough gasoline
air pollution
increasing global warming gases
Abundance of fossil fuels
3
A _______ bond is between a metal and a nonmetal
Ionic
Metallic
Covalent
Hydrogen
4
What is the maximum number of bonds that a carbon atom can form?
1
4
3
1
5
How do enzymes speed up reactions?
by increasing activation enery
By reducing activation energy
by reducing energy production
by reducing energy consumption
6
Which below is a reactant?
CxHy
energy
CO2
H2O
7
How do we get energy from the sun?
From stored energy in bonds of molecules like sugar.
The hot radiant energy goes straight into humans.
All creatures convert the sun's energy to chemical energy.
From nuclear fission in the sun.
8
What effect would changing the pH from 2.0 to 5.0 have on the activity of the peroxidase?
It would reduce the activity.
It would have no effect.
It would increase the activity.
It would stop the activity.
9
Carbon-12 and carbon-13 have different masses because they have a different number of
electrons
neutrons
protons
photons
10
What is an organic molecule?
Molecules made of oxygen.
Molecules made of carbon
Dead things that make you healthy
Living things that make you healthy.
11
It is often said that all energy on Earth ultimately comes from _____.
people.
animals.
fossil fuels.
the sun.
12
The elements in the carbon group
are all nonmetals.
are all metals.
have 2 electrons in the p orbital.
have a 2- charge.
13
Adding a catalyst _________ the ________ energy of the reactants.
increased, activation
decreased, potential
decreased, activation
increased, potential
14
According to collision theory, which will NOT speed up a reaction?
less surface area
more particles
faster particles
lower activation energy
15
A _______ bond is between a nonmetal and a nonmetal.
Metallic
Hydrogen
Covalent
Ionic
16
How is the heat energy from the sun stored in organic molecules?
As kinetic energy as carbon atoms move.
In chemical bonds of carbon molecules
In the mass of electrons of carbon atoms.
In carbon atoms' nuclei.
17
Which equation is balanced?
a. C6H12O6 → CO2 + H2O
a. C6H12O6 + O2 → 6CO2 + 6H2O
a. C6H12O6 + 6O2 → 6H2O
a. C6H12O6 + 6O2 → 6CO2 + 6H2O
18
Salivary amylase helps digest starch in the
small intestines.
mouth.
stomach.
liver.
19
Which below is a product?
CxHy
O2
None of these
CO2
20
Which is true of exothermic reactions?
energy of reactants < energy of the products
mass of reactants < mass of the products
energy of reactants > energy of the products
mass of reactants > mass of the products
21
What is the purpose of photosynthesis?
Chemical energy is converted to a useable form.
Light energy is stored in a useable form.
Energy from water molecules is stored.
Oxygen molecules produce energy.
22
Which has the greatest concentration of hydrogen?
pH = 6.0
pH = 1.0
pH = 5.5
pH = 4.0
23
If heat is released by a chemical reaction,
Some energy is released to surroundings
All energy is in product molecules.
All energy is released to surroundings.
Some energy is in the reactant molecules.
24
A carbon and oxygen atom is joined by a ______ bond.
Metallic
Hydrogen
Ionic
Covalent
25
The reaction rate below ____ at higher concentrations because ____ collisions can occur.
increase, less
decrease, less
increase, more
decrease, more

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