7th Grade Quarter 1 Summative Study Guide

Chemistry

Chemistry

the study of substances and how they interact

Substance

a type of matter with uniform properties; a specific type of matter

Matter

anything that has mass and takes up space

Properties

characteristics of a substance

Chemical name

the name chemists use for a substance, which refers to the names of the elements in that substance

Chemical formula

shows the elements found in the substance; a code that represents the number and kinds of atoms in one particle of a substance

Vial

a small container that is typically cylindrical in shape

What is the common name for “sodium carbonate?”

Washing soda

What is the common name for “sodium chloride?”

Table salt

What is the common name for “ascorbic acid?”

Vitamin C

What is the common name for “citric acid?”

Citric acid

What is the common name for “sucrose?”

Sugar

What is the common name for “sodium bicarbonate?”

Baking soda

What is the common name for “magnesium sulfate?”

Epsom salts

What is the common name for “calcium chloride?”

Road salt

What is the common name for “calcium carbonate?”

Chalk

What must you always remember when making observations during a lab?

• Use your senses to make observations (except for taste in the current investigation)

• Be as detailed and precise as possible

What were the details of the first test you did to try and find the 2 substances that make up the mystery mixture?  (You can paraphrase)

• You were provided with 5ml of mystery mixture 

• You added a total of 4-5 pipettes of water

• In between adding each pipette of water you observed and recorded what you observed

• You took note of the temperature of the mixture after water was added

• You took note of the bubbles and fizzing that occurred

• You took note of the sound 

• You took note of what happened as you continued to add more pipettes of water to the mixture

How do you properly use a pipette?

• Squeeze the bulb while the pipette is still in the water, then release the bulb

• When squeezing the bulb, be sure not to squeeze quickly and with great force

What is the name of the tool you used to look closer at the substances? 

Hand lens (magnifying glass)

What information was provided on the vial labels? (you must also be able to identify each part when shown to you)

• Chemical name

• Common name

• Chemical formula

What does the presence of bubbles indicate about the mixture when water is added? 

The production of gas

What are the uses of chalk, which was used in the investigation? (all uses are not listed)

Strengthen bones

What are the uses of road salt, which was used in the investigation? (all uses are not listed)

melting ice on roads and sidewalks

What are the uses of epsom salt, which was used in the investigation? (all uses are not listed)

Mixed with water to sooth sore feet

What are the uses of baking soda, which was used in the investigation? (all uses are not listed)

to fight tooth decay

What are the uses of sugar, which was used in the investigation? (all uses are not listed)

to sweeten foods

What are the uses of citric acid, which was used in the investigation? (all uses are not listed)

to preserve food

What are the uses of vitamin C, which was used in the investigation? (all uses are not listed)

helps body tissues grow and heal

What are the uses of table salt, which was used in the investigation? (all uses are not listed)

to preserve food; helps with muscle movement

What are the uses of washing soda, which was used in the investigation? (all uses are not listed)

to make glass and soap