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Biology - Chemistry of Life 2 - Classwork

Last updated 8 months ago

37 questions

Section 1 - Atomic Structure and Bonds

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Section 2 - pH

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Section 3 - Properties of Water

Section 3 - Wrap up project! (No quiz!)

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Question 1

1.

What is the smallest particle into which an element can be divided and still be the same substance?

electron

neutron

proton

atom

Question 2

2.

What part of the atom has a positive charge?

electron

neutron

proton

atom

Question 3

3.

What part of the atom has a negative charge?

electron

neutron

proton

atom

Question 4

4.

What part of the atom has a no charge?

electron

neutron

proton

atom

Question 5

5.

What is found in the center of an atom

electron

nucleus

library

electron cloud

Question 6

6.

What subatomic particles are found in the nucleus? Check all that apply

proton

electron

neutron

Question 7

7.

An electron is found...

inside the nucleus

next to a proton

outside the nucleus

next to a neutron

Question 8

8.

The main parts of an atom are?

proton, neutron, electron

proton, atom, electron

proton, compound, electron

Question 9

9.

In covalent bonds, atoms ______________________ electrons.  While in ionic bonds, atoms ______________________ , holding them together by the attraction between charges.

Other Answer Choices:

share

give up/accept electrons

Question 10

10.

The octet rule tells us that most atoms are stable with 8 electrons in their outer shell.

True

False

Question 11

11.

Acids are substances that produce hydrogen ions (H+) when dissolved in water. Lemon juice is an example of an acid. What does lemon juice taste like?

Question 12

12.

What does it feel like if lemon juice gets in your eye

Question 13

13.

Bases are substances that produce hydroxide ions (OH-) when dissolved in water. Hand soap is an example of a base. What does soap feel like?

Question 14

14.

What does soap taste like?

Question 15

15.

What does it feel like if soap gets in your eye?

Log in to Gizmos and sign in using my username MrsTAButler and your password (math with your initials after)

When you get to your dashboard, there will be a Gizmo called pH Analysis, use it to complete the questions below.

Question 16

16.

The strength of an acid or base is measured on the pH scale. The term “pH” is short for “potential of hydrogen.” It is a measure of how many excess H+ ions there are in a solution. The pH scale runs from 0 to 14, with 0 representing the highest concentration of hydrogen ions. Acidic substances have a pH below 7, while alkaline substances (bases) have a pH above 7. Pure water has a pH of 7 and is considered neutral.

The pH Analysis Gizmo allows you to find the pH of a variety of liquids. In the Gizmo, check that the Substance in the tube is Ammonia, and click Test. Wait until the animation is finished.

Indicators change color in acids or bases. What is the color of the pH paper?

Question 17

17.

Compare the paper to the pH color chart. What is the pH of ammonia?

Question 18

18.

Is ammonia acidic or alkaline?

Question 19

19.

Get the Gizmo ready:
Click Reset.
Check that the 0-14 paper is selected.

Test: Use the Gizmo to find the pH of each of the available substances. Classify each substance as acidic (pH < 7), alkaline (ph > 7), or neutral (pH = 7). Fill in the chart in the show your work box.

Question 20

20.

Summarize: Compare all the acidic substances and all the alkaline substances.
In general, what types of substances tend to be acidic?

Question 21

21.

Summarize: Compare all the acidic substances and all the alkaline substances.

2. What types of substances tend to be alkaline?

Question 22

22.

Get the Gizmo ready:
Click Reset.
Select the 4.5-7.5 paper.

Goal: Find the pH of substances in a more accurate way.
Test: Before you begin testing with the 4.5-7.5 paper, list the pH values of the substances below that you found using the 0-14 pH indicator paper. Then find the pH of each substance with the 4.5-7.5 paper. (or take a screenshot from the other show your work box!!)

Question 23

23.

Analyze: Compare the pH values in each column.
How do these values compare?

Question 24

24.

What is an advantage of using the 4.5-7.5 paper?

Question 25

25.

What is the disadvantage of using the 4.5-7.5 paper?

Question 26

26.

Given the results from two kinds of indicator paper, which substances appear to be neutral (pH = 7)?

Questions 27 & 28 | 01:08

Question 29 | 01:33

Question 30 | 02:01

Question 31 | 02:10

Question 32 | 02:54

Questions 33 & 34 | 03:08

Question 35 | 04:43

Question 36 | 05:08

00:00/00:00

Questions 27 & 28

01:08

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Question 29

01:33

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Question 30

02:01

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Question 31

02:10

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Question 32

02:54

1

Questions 33 & 34

03:08

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1

Question 35

04:43

1

Question 36

05:08

1

Create a single-page poster in the app of your choice (Slides, Docs, Genially, Canva, etc.) explaining why Water is the best compound.  You should include:

A diagram and explanation of why it has special properties (hint: it's polar!)

Explanations of each of the special properties with at least one relevant picture.  Include in your explanation why the property is important to life.

Four properties to cover:
water is sticky (cohesion/adhesion)
water is a super solvent
water is less dense as ice
water has a high heat capacity



It should be, colorful, neat, organized, easy to read, and contain accurate information.

Question 37

37.

Drop your link below - make sure you publish/share the item, don't just share the editing link!

Question 27

27.

Polar means that the water molecule is

positive at one end and negative at the other

negative

cold

divisive

Question 28

28.

The oxygen has a slightly positive charge because it is bigger and pulls all the electrons toward it

True

False

Question 29

29.

Hydrogen bonds

are between a slightly positive hydrogen in one molecule and a slightly negative oxygen in another moelcule

Make it easy for water molecules to bond

Give water special properties

All of the above

Question 30

30.

Adhesion helps water molecules stick

to other water molecules

to other substances

Question 31

31.

Cohesion helps water molecules stick

to each other

to other substances

Question 32

32.

Surface tension is the ability of water to stay stuck together because of cohesion.

True

False

Question 33

33.

Water being a super solvent means it can

always be clear

dissolve lots of other substances

stay the same with other things in it

precipitate other substances

Question 34

34.

Polar molecules and ionic compounds dissolve worse in water than non-polar molecules.

True

False

Question 35

35.

Ice floats because water

becomes more dense as ice

becomes less dense as ice

because water is liquid

because the fish make it

Question 36

36.

Having a high specific heat means water resists changes to temperature

True

False