The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

Enzyme decrease the activation energy of the reaction.

Enzymes increase the energy of the reactants.

Enzymes decrease the energy level of the products.

Enzymes reverse the direction of the reaction.

Which is true about a water molecule?

The oxygen has a partially negative charge

The oxygen has a partially positive charge

The hydrogen has a partially negative charge

An ionic bond forms when

One or more electrons are transferred

One or more electrons are shared

A proton gains a negative charge

The atoms becomes exothermic and undergoes thermolysis

What determines the chemical properties of an atom?

Number of electrons in the outside shell

The number of protons in the nucleus

The number of protons in the outside shell

The number of electrons in the nucleus

Ice floats on water because

ice has a higher density than water.

Why does water move from the roots to the leaves of plants?

Capillary action pulls the water molecules like a chain.

Water’s cohesion causes it to “pull” towards the leaves.

What are the four elements that all life is made up of?

Hydrogen, Oxygen, Nitrogen and Carbon

Helium, Oxygen, Neon and Carbon

Hydrogen, Titanium, Carbon, Nitrogen

Oxygen, Chlorine, Iron, Nitrogen

What is the difference between covalent bonds and ionic bonds?

Covalent bonds involve the sharing of electrons between atoms, and ionic bonds involve the electrical attraction between atoms.

ionic is sharing electrons; covalent is transferring electrons

Covalent bonds involve the sharing of protons between atoms, and ionic bonds involve the sharing of electrons between atoms.

Which of the following makes up a molecule of water?

two atoms of hydrogen and one atom of oxygen

one atom of hydrogen and one atom of oxygen

one atom of sodium and one atom of chlorine

one atom of hydrogen and two atoms of oxygen

What makes a molecule polar?

Unequal sharing of valence electrons

Equal sharing of valence electrons

Temporary charges that come and go

Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together

The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet

The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface

The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

Cohesion and adhesion of water molecules

Formation of covalent bonds between hydrogen and oxygen molecules

Biology Ch 2 Chemistry of Life

Authored by Michele Piatt

Biology

9th Grade

NGSS covered

Used 124+ times

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63 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What word describes when water is attracted to other substances?

cohesion

adhesion

capillary action

surface tension

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called

Covalent bonds

Ionic bonds

Polar bonds

Hydrogen bonds

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does ice float?

As water freezes, it expands and its density decreases.

As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Tags

NGSS.MS-PS1-4

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A molecule with electrically charged areas is called a _______________.

magnet

polar molecule

solution

electrical molecule

Tags

NGSS.MS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which end of the water molecule has a slightly positive charge?

the oxygen end

the hydrogen end

both ends are slightly positive

neither end is positive

Tags

NGSS.HS-PS1-3

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

Water is an acid.

Water is a versatile solvent.

Water has a high heat capacity.

Water acts as a buffer.

Tags

NGSS.HS-ESS2-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An enzyme speeds up a chemical reaction by

lowering the activation energy.

raising the activation energy.

releasing energy.

absorbing energy.

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Biology Ch 2 Chemistry of Life

What word describes when water is attracted to other substances?

Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called

Why does ice float?

A molecule with electrically charged areas is called a _______________.

Which end of the water molecule has a slightly positive charge?

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

An enzyme speeds up a chemical reaction by

An atom that has a charge is called a(n) _________.

What is the name for a catalyst that is made by a living organism?

The graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?

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