How many protons, electrons and neutrons does an neutral atom of Calcium have? Its atomic number is 20 and the mass number is 40.

20 protons, 20 electrons and 20 neutrons

20 protons, 18 electrons and 40 neutrons

40 protons, 40 electrons and 20 neutrons

20 protons, 18 electrons and 20 neutrons

A water strider can skate along the top of a pond because:

hydrogen bonds result in water cohesion (surface tension)

covalent bonds result in water cohesion

water striders have adapted to take advantage of water cohesion

Why can water have no net charge but have slight charges in different parts of the molecule?

The oxygen end is slightly negative and the hydrogen end is slightly positive

The hydrogen end is slightly negative and the oxygen end is slightly positive

The hydrogen and oxygen ends change in polarity

Which is NOT a unique property of water?

Frozen water floats on liquid water.

Water covers most of the Earth’s surface and retains a large amount of heat.

Water molecules stick to each other through hydrogen bonds.

Water is polar because...

The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

The molecule has two poles, at which the it is colder than other regions of the molecule.

The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.

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.

Which of the following is LEAST likely to dissolve in water?

salt made of a positive sodium ion and a negative chloride ion

all of the substances will dissolve easily in water

The substance that is dissolved into the solution.

The substance that does the dissolving in a solution.

The mixing of different substances.

The process in which neutral molecules lose or gain electrons

What is the activation energy?

The minimum energy needed by the reactants to form the products.

The energy lost in the reaction

What is the purpose of an enzyme?

give permission for the reaction

control how many reactions occur

Which solution is more concentrated? Solution 1: 500 mL of water 100 g of salt Solution 2: 500 mL of water 90 g of salt

They have the same concentration

Why do we want to test one variable at a time?

To know what is causing the changes. This helps us understand cause and effect.

Because it is hard to setup a data table with more

It is what has always been done

Chapter 2 Chemistry of Life

Authored by Michelle Bibel

Biology

9th Grade

NGSS covered

Used 109+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Charge of a proton

Positive

Negative

Neutral

Charge of a neutron

Positive

Negative

Neutral

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Location of the proton

Nucleus

Outside the nucleus

Electron cloud

Energy level

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Location of a neutron

Inside the nucleus

Outside the nucleus

Electron Cloud

Energy Level

# neutrons + # protons = ___

Atomic number

Atomic Mass

Mass Number

Valence Electrons

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Type of bond in which electrons are shared

Ionic

Covalent

Hydrogen

Metallic

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Type of bond in which electrons are transferred

Hydrogen

Ionic

Covalent

Metallic

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Chapter 2 Chemistry of Life

Charge of a proton

Charge of a neutron

Location of the proton

Location of a neutron

# neutrons + # protons = ___

Type of bond in which electrons are shared

Type of bond in which electrons are transferred

Always equal to the atomic number

Changing the number of this particle would create an ion

Changing the number of this particle would create an isotope

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