CHEM
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
