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Unit 1 Test Chemistry > Unit 1 Test Study Guide > Flashcards

Unit 1 Test Study Guide Flashcards

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1
Q

Write 0. 000 000 000 542 in scientific notation?

A

542 x 10^12

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2
Q

Write 5008 km in scientific notation

A

.5008 x 10^-4

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3
Q

What is the result of multiplying 2.5 10 by 3.5 10?

A

8750

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4
Q

Spongebob was trying to make Krabby Patties that weighed 12oz. He made 4 Krabby Patties. They all had the following weights: 12.12oz 11.9oz 12.2oz 12.1oz.

A

This is an example of Significant figures.

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5
Q

A class had a glass jar full of marbles. Each student guessed how many marbles the jar contained. Christina guessed 87 marbles and the jar had 88 marbles.

A

This is an example of Hypothesis.

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6
Q

Make your own example of a group of measurements that are precise.

A

Length of the stem of plants: 1.12cm, 2.32cm and .056cm

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7
Q

Make your own example of a group of measurements that are not precise.

A

Lengths of a pen: 2 and 1/3 of an inch

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8
Q

Make your own example of a group of measurements that are not accurate and not precise.

A

Length of a car: 24 inches and ¾ of an inch

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9
Q

How many significant figures are in the measurement 0.003415050 kg?

A

8 Significant Figures

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10
Q

Express the product of 232 km and 251.0 km using the correct number of significant digits.

A

200km and 250 km = 500000 km

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11
Q

Express the sum of 232.56 km and 251.2 km using the correct number of significant digits.

A

230 km and 250 km = 480 km

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12
Q

Round 171.009 m to four significant digits:

A

171.0

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13
Q

three significant digits:

A

171

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14
Q

two significant digits:

A

170

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15
Q

one significant digit:

A

200

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16
Q

What is the volume of an object measuring 2.44 x 10-3 by 1.44 x 10-2 by 8.5 x 10-2?

A

0.000298656

17
Q

What is the main advantage of using the metric system over other systems of measurement?

A

You can have more precise and accurate answers.

18
Q

What are the SI (metric) units of:

A

a. Mass- m
b. Length-cm
c. Volume- cm^3
d. Temperature- F or C

19
Q

A substance boils at 259 K. What is the boiling point of this substance expressed in degrees Celsius?

A

.15 degrees Celsius

20
Q

What is 0.0088 meters in centimeters?

A

.88 cm

21
Q

What is the equation for density? (Write the words AND symbols)

A

Symbol is D for density, M for mass, and V for volume and its Density equals mass divided by volume

22
Q

What is the density of an object having a mass of 18.0 g and a volume of 55 cm?

A

.327 cm

23
Q

What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?

A

4.34385

24
Q

The mass of the electron is 9.10939kg. Round the mass to 1, 2, 3, and 4 significant figures.

A

10, 9.1, 9.11, 9.110

25
Q

The density of osmium, which is the densest metal, is 22.57 g/cm. What is the mass of a block of osmium that measures 1.00 cm 4.00 cm 2.50 cm?

A

225.7

26
Q

You are given a large irregularly shaped metal. Describe a method for determining the identity of the metal.

A

By weighing the mass and the volume, divide those and you get the density

27
Q

A student measures a mass of 202.2 g, whereas the correct mass is 205 g. What is the percent error?

A

She/He did not round the mass

28
Q

Scientific method-

A

A method of procedures where you do a systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

29
Q

Hypothesis-

A

Where you make a statement without using an experiment to figure out it is true or false

30
Q

Independent variable-

A

a variable that is changed or controlled.

31
Q

Dependent variable-

A

variable that stays the same throughout the experiment

32
Q

Accuracy-

A

How close to correctness your answer is

33
Q

Precision-

A

How fined tuned your answer is

34
Q

Error-

A

When the answer or ending is not correct or when an experiment fails through the work of the scientist making a mistake

35
Q

significant figures-

A

are digits that carry meaning contributing to its measurement resolution

36
Q

Absolute zero-

A

the lowest possible temperature where nothing could be colder and no heat energy remains in a substance

37
Q

Kelvin-

A

A measurement of temperature

38
Q

Density-

A

the result when you divide mass over volume

39
Q

Weight-

A

How much mass an object has

Unit 1 Test Chemistry (1 decks)

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