Chapter 5: Cells

Question 1

The Bohr model of the atom is sometimes called the planetary model of the atom, why?

Answer 1

Because the model looks like all the planets rotating around the sun.

Question 2

What determines an atoms properties; what determines the majority of the atoms properties.

Answer 2

The neutrons, protrons, and electrons; the electrons, (or protrons.)

Question 3

An atom has 13 electrons, how many protrons does it have?

Answer 3

13

Question 4

Two atoms have slightly different properties, but belong to the same element. What is different about them?

Answer 4

Numbers of Neutrons

Question 5

The element carbon is composed of all atoms that have 6 protons, one of the elements in this atom is carbon 13. How many protons and neutrons are in this atom?

Answer 5

6 Protons and 7 Neutrons

Question 6

Identify each as an atom, molecule, or element.

NH3; P; Carbon-14; S; P4

Answer 6

Molecule, element, atom, element, molecule.

Question 7

Is there a difference between NO and NO2?

Answer 7

Yes, there are different numbers of oxygen molecules, which can cause the molecule to have different properties.

Question 8

Name each atom and how many are in this molecule; C2H4O2

Answer 8

Carbon -2 Hydrogen -4 Oxygen -2

Question 9

Name each as chemical or physical change: Pouring milk on cereal, baking bread, boiling salt water.

Answer 9

Physical, chemical, physical

Question 10

What is osmosis?

Answer 10

When something in a lower concentration, moves to a higher concentration,

Question 11

2;C^8 H^18 + 25:O^2&raquo_space;> 16;CO^2 + 18;H^2 O

a. Write the chemical formulas of the reactants in this equation.
b. Write the chemical formulas of the products in this equation.
c. How many molecules of C^8 H^18 are used in this reaction?
d. How many molecules of H^2 O are made in this equation?

Answer 11

a. C^8 H^18 and O^2
b. CO^2 and H^2 O
c. 2.
d. 18.

Question 12

A plants loses all its clorophyll, can it produce any glucose?

Answer 12

It can produce some, but not much.

Question 13

A chemist is trying to speed up a chemical reaction, if he does not have a catylist, what other means can he use?

Answer 13

He can use extreme heat.

Question 14

What is the chemical formula of the molecule with the following structure:

H-C=C-H
| |
H H

Answer 14

C^2 H^4

Question 15

S chemist takes a polysaccharide and turns it into many disaccharides. Has the chemist used dehydration or hydrolysis.

Answer 15

Hydrolysis

Question 16

4 Solutions with different PH levels.
Solution A: 8.1 B: 1.1 C: 5.5 D. 13.2
a. Which is the most alakine?
b. Which is the most acidic?

Answer 16

a. Solution D: 13.2

b. Solution B: 1.1

Question 17

If plenty of glycerol is available, then how many fat molecules can we make with 15 fatty acid molecules?

Answer 17

We can make 5.

Question 18

Since dehydration reactions link amino acids in order for them to form proteins, you can probably guess hydrosis breaks them down. Why don’t proteins quickly break down into their amino acids when they are mixed with water?

Answer 18

Because there are no enzymes to react with.

Question 19

Give the other side of: Adenine, cytosine, thymine, guanine:

Answer 19

Thymine, guanine, adenine, cytosine: