Test 1 Review

Water

100

What is Cohesion?

Attraction between like molecules 

200

What is adhesion?

Attraction between 2 different substances/molecules

300

What is surface tension?

Due to cohesion, water pulling water inward, creating a surface film and the surface of water.

 Thin film on the surface of water

400

How does cohesion and adhesion play apart in capillary action ?

Adhesion- Water molecules sticking to the stem (xylem) 

Cohesion- Water pulling other water molecules upward as they travel to leaves.

500

1. What force is responsible for water droplets forming on a leaf?
   A) Cohesion
   B) Adhesion
   C) Surface tension
   D) Gravity

A. Cohesion- Water attracts to water to make droplets form.

pH

100

What is the pH of acids ?

1-6

200

What is the pH of bases ?

8-14

300

What is the pH of water ?

Water is considered and will always be considered 

_ _ _ _ _ _ _

7 

Neutral 

400

Acids turn _ _ _ _ litmus paper _ _ _

Bases turn _ _ _ litmus paper _ _ _ _ 

Blue, red 

Red, blue 

500

13. An acid is a substance that:
    A) Accepts protons
    B) Donates protons
    C) Has a pH greater than 7
    D) Turns red litmus paper blue

B. Donates Protons

Remember pH means Potential Hydrogen so 

Acids donates 

Bases receive 

Matter

100

What is an element ?

A pure substance, cannot be broken down, Found on the periodic table.

200

What is a compound?

A combination of 2 or more different elements

300

What are the 2 types of mixtures?

Homogeneous 

Heterogeneous

400

What is a homogeneous mixture?

Provide an example 

A mixture that looks uniform throughout

Ex: Coffee, Air, Saltwater etc..

500

What is heterogeneous mixture?

Provide an example?

A mixture that all components can be seen 

Ex: Trail Mix, Salad, Pizza etc...

Combo

100

1. What causes water to rise up a narrow glass tube?
   A) Cohesion only
   B) Adhesion only
   C) Both cohesion and adhesion
   D) Neither cohesion nor adhesion

C. Remember, adhesion clings to the glass, cohesion pulls other molecules up 

200

7. A substance that cannot be broken down into simpler substances by chemical means is:
   A) A compound
   B) An element
   C) A homogeneous mixture
   D) A heterogeneous mixture

B. Remember that an element can not be broken down.

300

13. Which of the following is a characteristic of bases?
    A) Sour taste
    B) pH less than 7
    C) Turns red litmus paper blue
    D) Reacts with metals to produce hydrogen gas

C 

400

When mixing an acid and base together it brings the liquid closer to 

Neutral 

500

13. Which of the following is likely to be basic?
    A) Lemon juice
    B) Vinegar
    C) Baking soda solution
    D) Carbonated water

C