CHEM

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copper wire

pure substance

helium

pure substance

compounds are

pure substances that are made of more than one element.

When diluting an acid, always pour

the acid into the water.

Keeping in mind the rules for significant figures, divide 92.00 g by 3.57032 mL.

25.77 g/mL

Calculate the quantity 87.1 cm − 1.308 cm.

85.8 cm

The quantity 8.7 × 105 g expressed in standard decimal notation is

870,000 g

Express the number 9067.5 in scientific notation to 4 significant figures.

9.068 × 10^3

The quantity 0.0000064 g expressed in scientific notation is

6.4 × 10−6 g.

The SI unit for temperature is

Kelvin

The base unit for mass is the

Kilogram

The base unit for length is the

Meter

MSDS (Material Safety and Data Sheets) are used to tell

Information on any potentially harmful chemical in the lab

Sugar dissolved in water is

a homogenous mixture

The smallest particle of an element that can be identified as that element is

an atom

Which of the following is a chemical property of sulfur?

burns in air

A factor of 1.0×10−2 corresponds to the prefix

centi

concrete

heterogeneous

brass.

homogenous

bronze

homogenous

Particles in which state are close together, yet free to move around one another

liquid

Which of these are chemical? 1. melting ice. 2. a rusting nail. 3. mixing alcohol and water. 4. dissolving sugar in tea.

2. rusting nail

What is not a pure substance?

air

Calculate 3217. km + 13.1 km + 1.30 km. Round off if necessary to apply the rule of significant figures for addition and subtraction of data numbers.

3231. km

The number 0.000001010 has how many significant digits

4

When a substance changes from a solid to a gas without becoming a liquid, it has

sublimed

How many micrograms are there in 0.010 mg?

10

Which of water, iron, ammonia, chromium, radon, and silicon are chemical compounds as opposed to elements?

water and ammonia

Consider the following properties: I) The red color of rubies is due to the presence of chromium ions. II) Objects made of silver become tarnished. III) The boiling point of ethanol is 78◦C. Which is/are chemical

2 only

How may significant digits are found in 765.000? 1. 2 2. 3 3. 6 4. 4 5. None 6. 5

3. 6

Which set of units is in order of increasing magnitude? 1. mg < dg < cg 2. mA < µA < cA 3. nL < mL < dL 4. mW < kW < cW 5. Mm < km < cm

3. nL < mL < dL

What is the length of the line segment indicated on the scale provided using proper significant figures?

3.00

The number 4.0500 rounded to two significant figures is

4.0

Based on the organization within the periodic table, which element is expected to have 2+ charge when it forms an ion

Group 2A

In which of the following sets are the symbol of the element, the number of protons, and the number of electrons given correctly?

In 49 protons, 49 electrons

You can compress a gas because

of the enormous empty space between its particles


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