Intro to Chem Review

Concept 1

100

Which of the following is an example of a qualitative observation?

The shirt is red.

200

How many significant figures are in the measurement 760 mmHg?

D.3

300

A solution where the solvent is water is known as a(n)

A. aqueous solution

400

Matter with an indefinite shape but a definite volume would be considered a

B. liquid

500

You are given a container filled with clumps of iron and sand. You can separate the iron from the sand using a magnet. This makes this a .

C. heterogeneous mixture

Concept 2

100

Write the following numbers in scientific notation:

78,700,000,000  

0.0099

7.87 x 10¹⁰

 9.9 x 10^-3

200

Write the following numbers in standard notation:

3.102 x 10⁶  

3,102,000

300

Convert the following measurement.

0.06 tons to grams 

60,000 g

0.06tons/1,000 kg/1,000 g =60,000g

             1 ton/     1 kg =1 

400

Write the following numbers in standard notation:

5.01 x 10^-2 

0.0501

500

Convert the following measurement. 

 9,500 feet to miles

1.8 Mi

9,500ft/ 1 mi=9500mi 

           5280 ft=5280 

Concept 3

100

Differentiate between a compound and a mixture

A compound is made when atoms are chemically combined in a fixed proportion whereas a mixture is made when substances are physically combined

200

Differentiate between a compound and a mixture.

A compound is made when atoms are chemically combined in a fixed proportion whereas a mixture is made when substances are physically combined.

300

Iron and oxygen react to form rust. Answer the following question based on this.

Is this a physical or chemical change? Explain how you know.  

Chemical change because something new (rust) is being formed.

400

Classify the following as an element, compound, homogeneous mixture, or heterogeneous mixture. 

a. Salt 

b. Chlorine

c. Hot chocolate with whipped cream 

d. Pure water

A. Compound 

B. Element 

C. Hetero. mixture 

D. Compound

500

Classify the following as a chemical change (C) or a physical change (P).

a. Chopping wood 

b. Burning wood 

c. An apple oxidizing 

d. Steam from a shower

A. P

B. C

C. C

D. P

Surprise Me!

100

List some signs that may demonstrate that a chemical reaction has occurred.

•Release of light

•Sudden temperature change

•Sudden color change

•Odor change

•Gas given off

•Sudden appearance of a precipitate

200

Homogeneous mixture

-A mixture with an even distribution of components

300

Heterogeneous mixture

-A mixture with an uneven distribution of components

400

Write the following values in scientific notation: 0.0518

5.18 x 10^-2

500

Convert the following values:

5,500 millimeters into yards

6.0 yd

Vocabulary

100

Significant figures

-The number of digits in a measurement that reflect how accurate the measurement is

200

Element

-A pure substance that cannot be broken down into anything simpler or more stable

300

Conversion factors

-Ratios of equivalent values (meaning they equal 1)

400

Dimensional Analysis

-A technique for converting numbers into different units, without changing their value

500

Compound

-A pure substance that can be chemically broken down into simple and more stable substances; when atoms of two or more elements are chemically combined