Ch.6 Test

Front 1

An element is a substance that can be broken down into simpler substances.

Back 1

False/Can't

Front 2

On Earth, about 25 elements are essential to living organisms.

Back 2

True

Front 3

Only four elements-carbon,hydrogen,oxygen,and nitrogen-make up more than 96% of the mass of a human.

Back 3

True

Front 4

Each element is abbreviated by a one or two letter formula.

Back 4

False/Abbreviation

Front 5

Trace elements, such as iron and magnesium, are present in living things in very large amounts.

Back 5

False/Small

Front 6

The properties of elements are determined by their structure of atoms.

Back 6

True

Front 7

What is the positive molecule in the atom?

Back 7

Proton

Front 8

What is the neutral molecule in the atom?

Back 8

Neutron

Front 9

What surround the atom?

Back 9

Energy Levels

Front 10

What is the center of the atom?

Back 10

Nucleus

Front 11

What is in the energy levels of an atom?

Back 11

Electron

Front 12

What is the maximum number of electrons in each of the following energy levels: first, second, third?

Back 12

First=2 Second=8 Third=18

Front 13

Boron has two isotopes, boron-10 and boron-11. Boron-10 has five protons and five neutrons. How many protons and neutrons does boron-11 have? Explain

Back 13

Five Protons Six neutrons

Front 14

H2O a liquid that no longer resembles either hydrogen, or oxygen gas.

Back 14

Compound

Front 15

A substance that can be broken down in a chemical reaction.

Back 15

Compound

Front 16

Carbon, the substance represented by the symbol C.

Back 16

Element

Front 17

Found in the compound NaCl?

Back 17

Ionic Bond

Front 18

Increases the stability of atoms?

Back 18

Ionic Bond/Covalent Bond

Front 19

Results in the formation of a molecule?

Back 19

Ionic Bond/Covelant Bond

Front 20

Is formed when atoms share there electrons?

Back 20

Covalent Bond

Front 21

Why must chemical equations always balance?

Back 21

The law of conservation of matter.

Front 22

Which number indicates the number of atoms of each element in a molecule of a substance?

Back 22

Subscript

Front 23

When is a mixture a solution.

Back 23

When the elements in the mixture retain their identity.

Front 24

What is the difference between an acid and base?

Back 24

An acid is any substance that forms hydrogen ions (H+) in water. A base is any substance that forms hydroxide ions (OH-) in water.

Front 25

In a water molecule, electrons are shared equally between the hydrogen atoms and oxygen atom.

Back 25

False

Front 26

The attraction of opposite charges between hydrogen and oxygen forms a weak oxygen bond.

Back 26

False

Front 27

Because of it's polarity, water can move from the roots of a plant up to its leaves.

Back 27

True

Front 28

Water changes temperature easily.

Back 28

False

Front 29

Unlike most substances water expands when it freezes.

Back 29

True

Front 30

All objects in motion have.

Back 30

Kinetic Energy

Front 31

The first scientist scientist to observe evidence of the random motion of molecules was

Back 31

Brown

Front 32

The net movement of particles from an area of higher concentration to an area of lower concentration is called

Back 32

Diffusion

Front 33

Diffusion occurs because of

Back 33

Random movement of particles

Front 34

When a few drops of colored corn syrup are added to a beaker of pure corn syrup, the color will

Back 34

Start to diffuse

Front 35

Diffusion can be accelerated by

Back 35

Increasing the temperature

Front 36

When materials pass into and out of a cell at equal rates, there is no net change in concentration inside the cell. The cell is a state of

Back 36

Dynamic Equilibrium

Front 37

The difference in concentration of a substance across space is called

Back 37

Concentration gradient

Front 38

Carbon atoms can bond together in straight chains, branched chains or rings.

Back 38

True

Front 39

Large molecules containing carbon atoms are called micromolecules

Back 39

False/Biomolecule

Front 40

Cells use carbohydrates for energy

Back 40

True

Front 41

Monosaccharide

Back 41

Glucose

Fructose

Sucrose

Front 42

Dissaccharide

Back 42

C6H12O6

C12H22O11

Front 43

Polysaccharide

Back 43

Starch

Glycogen

Cellulose

Front 44

Made up of nucleotides

Back 44

Nucleic Acid

Front 45

Most consist of three fatty acids bonded to glycerol molecule.

Back 45

Lipids

Front 46

DNA and RNA

Back 46

Nucleic Acid

Front 47

Contain Peptide Bonds

Back 47

Proteins

Front 48

Produce Proteins

Back 48

Nucleic Acids

Front 49

Commonly called fats and oils

Back 49

Lipids

Front 50

Made up of amino acids

Back 50

Proteins

Front 51

Used for long term energy storage, insulation, and protective coatings

Back 51

Lipids

Front 52

Contain carbon, hydrogen,oxygen,and nitrogen.

Back 52

Proteins