Chem Final
A sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. The density of gold is
19.3 g/cm3
An analytical balance can measure mass to the nearest 0.0001 g. In scientific notation, the accuracy of the balance would be expressed as
1x10^-4g
The measurement 0.020 L is the same as
2.0x10^-2 L
The number of significant figures in the measurement 2010 cm is
3
When 11.4 is divided by 3.2 the correct answer is ___________.
3.6
The product of 13 cm and 5.7 cm is correctly reported as
4 cm2
Three samples of 1.12 g, 1.8 g, and 1.562 g are mixed together. The combined mass of the three samples, expressed to the correct number of significant figures, would be recorded as
4.5 g
When 1.92 x 10-3 mL is subtracted from 6.8 x 10-1 mL, the correct answer rounded for significant figures equals
6.8x10^-1mL
If 1 inch equals 2.54 cm, how many centimeters equal 1 yard?
91.4 cm
What is the name for the element whose symbol is Bi?
bismuth
Organic chemistry is the study of
carbon containing compounds
_________ is an example of a chemical change.
changing color
A solid substance is
always the shape regardless of its container.
A team of scientists is working to discover how an enzyme affects blood cells in sheep. They are working in the field of _____________.
analytical chemistry
A chemical can be defined as
any substance that has a definite composition
Standards of measurement are chosen because they
are reproducible in another laboratory.
Matter includes all of the following except
light
Which of these measurements has only nonsignificant zeros?
0.0037 ml
The measurement 0.035550 g rounded off to two significant figures would be
0.036 g
A volume of 1 milliliter is equivalent to
1 cubic centimeter
The scientific method always begins with _______________.
observing
Which of the following is an example of a homogeneous mixture?
orange juice
The horizontal rows on the periodic table are called
periods
A chemist obtained the values 5.2246 g, 5.2353 g, and 5.2501 g for the mass of a sample. Without knowing the true mass of the sample, it can be said that these values have
poor precision
If repeated measurements agree closely but differ widely from the accepted value, these measurements are
precise, but not accurate
Find the symbol for the element Argon.
Ar
Find the symbol for the element Europium
Eu
What is the symbol for the element Neon?
Ne
Iron and sulfur, when heated, form an iron sulfide that has different properties from either iron or sulfur. The formation of iron sulfide is an example of a ____________ change.
chemical
Which of the following is an example of an intensive property?
density
The density of an object is calculated by
dividing its mass by its volume
____________ is a pure substance that cannot be broken down and made of only one type of atom.
element
Gravel is an example of a(n) _____________ mixture.
heterogenous
What is the name for the element whose symbol is H?
hydrogen
Applied research is carried out
in order to solve a particular problem
What happens to the energy in a substance when it changes state?
it changes form, but is neither destroyed nor increased.
All of the following are examples of units except
mass
Which of these is a measure of the amount of material that is not effected by gravity?
mass
Which of the following is not a chemical change?
melting
The SI base unit for length is the
meter
The symbol mm represents
millimeter
Iron and sulfur, when heated, form an iron sulfide that has different properties from either iron or sulfur. The formation of iron sulfide is an example of the ____________ in this reaction.
products
Palo Verde's school colors are Black, Green and Silver. This is an example of ______________ data.
qualititative
The oxygen in the air causes iron to rust. Iron and oxygen are ______________ in the process and rust is the product.
reactants
A theory is accepted as the explanation of an observed phenomenon until
repeated observations conflict with the theory.
Metalloids are often
semiconductors
A homogeneous mixture is also called
solution
The graphs for direct and inverse proportions are ___________ and ____________.
straight, curved
_______________ is performed to better our quality of life.
technological development
If values for x and y vary as an inverse proportion,
their product is a constant