Ch. 1 | Chemistry In Our Lives
12+(-15)=
-3
Write 7.13 x 10 ^-5 in standard notation.
0.0000713
Write 8.6 x 10^-4 in standard notation.
0.00086
The Scientific Method
1. Make Observation 2. Propose Hypothesis 3. Several Experiments 4. Conclusion to determine if hypothesis is true/false
1. You ___ that your friend has a new cat. 2. You ask yourself why you are sneezing and form a ____ that you are allergic to cats. 3. You perform ___ to test your hypothesis by visiting with other friends' cats. 4. If you sneeze after leaving the homes with cats, you come to the ____ that your hypothesis is correct.
1. Observe 2. Hypothesis 3. Experiments 4. Conclusion
Write 0.021 in scientific notation.
2.1 x 10 ^-2
Write 2400 in scientific notation. Identify the coefficient and the power of 10.
2.4 x 10^3 • the coefficient is 2.4 • the power of 10 is 3.
Write 3.0 x 10 ^8 in standard notation.
300000000
A bag contains 100 jellybeans. If 32 of them are red, what percentage of the jellybeans in the bag are red?
32%
A bouquet of flowers has 4 red roses, 6 pink carnations, and 10 white daisies in it. What percent of the flowers in the bouquet are daisies?
50%
Write 64 000 in scientific notation.
6.4 x 10 ^4
If there are 25 marbles in a box and 9 of them are blue, what percentage of the marbles are NOT blue?
64%
What number occupies the hundredths place in 547.982?
8
What does the line on a graph indicate?
A direct relationship
Write the following numbers in standard notation. A. 1 x 10 ^-1 B. 1 x 10 ^-2 C. 1 x 10 ^-3 D. 1 x 10 ^-4
A. 0.1 B. 0.01 C. 0.001 D. 0.0001
Write the following numbers in standard notation. A. 1 x 10 ^4 B. 1 x 10 ^3 C. 1 x 10 ^2 D. 1 x 10 ^1 E. 1 x 10 ^0
A. 10 000 B. 1 000 C. 100 D. 10 E. 1
Which of the following is a conclusion? A. Drinking soda at night keeps Bob awake. B. If Bob stops drinking soda at night, he will be able to sleep. C. Bob doesn't drink any soda on Monday night. D. Bob sleeps well on Monday night
A. Drinking soda at night keeps Bob awake.
Identify each of the following as an observation, a hypothesis, an experiment, or a conclusion: A. During your visit to the gym, your trainer records that you ran for 25 minutes on the treadmill. B. Scientific studies show that exercising lowers blood pressure. C. Your doctor thinks that your weight loss is due to increased exercise.
A. Observation B. Conclusion C. Hypothesis
Matter
All substances that make up our world.
Which of the following is not proper scientific notation? A. 4 x 10 ^8 B. 12.6 x 10 ^2
B. 12.6 x 10 ^2
Which of the following contains chemicals? A. Sunlight B. Fruit C. Milk D. Breakfast cereal
B. Fruit, C. Milk, D. Cereal
Which of the following is a hypothesis? A. Drinking soda at night keeps Bob awake. B. If Bob stops drinking soda at night, he will be able to sleep. C. Bob doesn't drink any soda on Monday night. D. Bob sleeps well on Monday night.
B. If Bob stops drinking soda at night, he will be able to sleep.
How do you determine a percentage?
Divide the parts by the total (whole) and multiply by 100%.
When a positive number and a negative number are multiplied or divided, the answer is
Negative (-)
When two negative numbers are added, the answer is
Negative (-)
Solve the following equation for P1. P1V1 = P2V2
P1 = P1V2 / V1
When two positive numbers are added, the answer is
Positive
When two positive numbers or two negative numbers are multiplied or divided, the answer is
Positive (+)
Chemicals
Substances that have the same composition and properties wherever found.
What happens when a positive number and a negative number are added together?
The smaller number is subtracted from the larger number and the result has the same sign as the larger number.
Chemistry
The study of composition, structure, properties, and reactions of matter. * happens all around you every day *
What is the place value for the 8 in the number 2.378?
Thousandths
Rearrange the following equation to solve for V: PV = nRT
V = nRT/P
When is the hypothesis modified?
When the results of the experiment do not support the hypothesis
Solve the following equation for x. 5x-3 = 3x-5
x = -1
Solve the following equation for x. -4x+2 = 22
x = -5
Examples of matter include:
• Air • Water • Gas • Antacid Tablets