Concept 1
Which of the following is an example of a qualitative observation?
The shirt is red.
Write the following numbers in scientific notation:
78,700,000,000
0.0099
7.87 x 1010
9.9 x 10-3
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
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
Significant figures
-The number of digits in a measurement that reflect how accurate the measurement is
How many significant figures are in the measurement 760 mmHg?
D.3
Write the following numbers in standard notation:
3.102 x 106
3,102,000
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.
Homogeneous mixture
-A mixture with an even distribution of components
Element
-A pure substance that cannot be broken down into anything simpler or more stable
A solution where the solvent is water is known as a(n)
A. aqueous solution
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
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.
Heterogeneous mixture
-A mixture with an uneven distribution of components
Conversion factors
-Ratios of equivalent values (meaning they equal 1)
Matter with an indefinite shape but a definite volume would be considered a
B. liquid
Write the following numbers in standard notation:
5.01 x 10-2
0.0501
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
Write the following values in scientific notation: 0.0518
5.18 x 10-2
Dimensional Analysis
-A technique for converting numbers into different units, without changing their value
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
Convert the following measurement.
9,500 feet to miles
1.8 Mi
9,500ft/ 1 mi=9500mi
5280 ft=5280
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
Convert the following values:
5,500 millimeters into yards
6.0 yd
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