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100

The law of conservation of mass states that ...

Mass cannot be created nor destroyed on transformed. The mass of the reactants must equal the mass of the products (Closed system)

100

How is a chemical change different than a physical change?

Physical change the chemical composition stays the same. Chemical change something new is made- molecules break and make new bonds creating new materials. 

100

What is an acid?

a substance with H+ ions

100

What is a base?

A substance with extra OH- ions

100

What is matter?

Anything that has mass and takes up space. 

500

Which substance is most acidic on the pH scale? 

A. Hydorcloric Acid (pH= 0)

B. Black Coffee (pH=5)

C. Soapy Water (pH=12)

D. Bleach (pH=13)

A. Hydrochloric Acid 

500

2H2 + O2 = 2H2O

What is true?

A. The equation is balanced 

B. The equation is not balanced 

C. New elements were formed as a result of the reaction. 

D. Some atoms disappeared as a result of the reaction. 

B. The equation is balanced

500

Which substance would be considered a weak base on this pH scale? 


A. Urine (6)

B. Soapy Water (12)

C. Distilled Water (7)

D. Sea Water (8)


D. Sea Water

500

What happens when heat is added to a reaction?

The reaction happens faster (Glow sticks)

500

Which activity is an example of a chemical change?

A. dissolving salt in water

B. Hammering aluminum into thin sheets

C. Melting gold to make jewelry

D. Burning wood to produce ashes

D. Burning wood. 

500

Which process is an example of a physical change?

A. Burning coal 

B. Cutting a marshmallow

C. A rotting apple

D. Milk turning sour

B. Cutting a marshmallow

500

What is an endothermic reaction, include making or breaking bonds and absorbing or releasing heat in your answer. 

In endothermic reactions, the energy needed to break existing bonds is greater than the energy released when new bonds are formed. Resulting in the reaction being cold. 

500

What is an exothermic reaction?

In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture.

500

Which of the following shows an endothermic reaction? 

A. When CaCl is added to water the temp goes up. 

B. When baking soda is added to CaCl, the temp goes down

C. When Alka-Seltzer is mixed with water, the temp goes up 

D. When a glow stick is cracked, light is given off. 

B. When baking soda is added to CaCl, the temp goes down

500

Which is considered a compound? 


A. A noble gas

B. Salt dissolved in water

C. Carbon chemically combined with oxygen 

D. Chex Mix 

C. Carbon chemically combined with oxygen 

500

How many Nitrogen are in the following compound C7H6(NO2)3?

3

500

DAILY TRIPLE:

List 5 properties of ACIDS 

List 5 Properties of BASES

  • Acids have sour taste.
  • Acids turn blue litmus red.
  • Acids have pH less than 7.
  • Strong acid cause burn on skin.
  • Strong acids also destroy fabric.
  • Conducts electricity 


-Slippery

-Bitter

-Does not conduct electricity 

-turns litmus paper blue 

-8-14

500

List 5 signs of a chemical reaction. 

Precipitate 

Bubbles (Gas production) 

Color Change

Change in temperature 

Light given off 

Odor 

500

List 5 properties of Physical Changes. 

Expected color change · 

Change in size or shape · 

Change in state of matter · 

Reversible · 

No new substance formed!


500

What respective sides are the reactants and products on in a chemical reaction?

Reactants = Left

Products = Right 

500
What is a precipitate?

When two liquids make a solid. 

500

What happens when a base and an acid are combined?

The process of neutralization occurs and salt and water is made. 

500

Litmus turns what color for each acid and base?

Litmus=Red=Acid

Litmus=Blue=Base

500

DAILY DOUBLE: What does pH stand for?

Percent of HYDROGEN

500

What are the two ranges for acids and bases? 

What pH is neutral-give an example. 

0-6 Acid

8-14 Base 

Neutral = Distilled H20

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