Abeka 11th Grade Chemistry Test 1
carbon
C
How many protons are in 77/34SE2-
34 (denominator)
According to the rules for significant digit, what should the answer to the problem be rounded to? 8.7 - 42.50/ 10.0
4.5
How many neutrons are in 77/34SE2-?
43 (77-34)
silver
Ag
If 0.00000034 is converted to scientific notation, which should the power often be
-7
Which brand of chemistry deals with identifying what substances are present in materials and how much of each substance is present?
Analytic chemistry
What theory states that a chemical reaction is a result of rearrangement, combination, or separation of Atoms?
Dalton's atomic theory
Which of the following subatomic particle is not found in the nucleus
Electron
Which subatomic particle was Milkins's oil drop experiment used to measure the charge of?
Electron
Which of the following describes the classification of O2?
Element and molecule
Who proposed the planetary model of the atom?
Ernest Rutherford
iron
Fe
Which of the following is a chemical property?
Flammability
Which method of separating mixtures involves dissolving a solid mixture in a small volume of hot solvent and slowly cooling it
Fractional crystallization
What techniques separates substances, with similar boiling points by boiling the mixture beneath the tall column containing many surfaces on which vapor may condensed
Fractional distillation
Which of the following states of matter has the most kinetic energy?
Gas
Which state of matters is defined as having no definite shape or volume and being easily compressed
Gas
43 through 44 Caleb measure the length of his classroom four times; and his results were 8.172 M, 8.170 M, 8.173 M, and 8.175 M caleb average his measurements and reported his answer as 8.1725M. Did he round his answer correctly according to the rules at first significant digits? If not what should have been rounded to?
He should've rounded to 8.173M
Mercury
Hg
iodine
I
As the temperature of a sample of matter increases, the kinetic energy of its particles will
Increase
Which of the following quantities does not have any uncertainty?
Length of a minute in seconds
Which state of matter is defined by having a definite volume and the shape of its container
Liquid
Caleb's teacher told him that the meter he use was actually 1.05 M long. How are the accuracy and precision of his measurement best described
Low accuracy and high precision
The sum of the number of protons and neutrons in an atom is the what
Mass number
Which of the following is a physical process?
Melting ice
What is the central portion of an atom that contains most of the mass called?
Nucleus
In dimensional analysis, what value should a conversion factor always equal?
One
Which branch of chemistry is the study of carbon containing compounds?
Organic chemistry
The idea that refers to the consistency or reproduceability of a measurement is
Precision
What principle do scientist based the assumption that events in the universe have rational causes?
Principle of casualty
Solve the following equation for our; assume that our is always a positive value F= Gm1m2/r2(squared)
R2= Gm1m2/F
Chemist in two different labs measure the density of different 1kg samples of iron using the same method; the results were the same to within significant digits. These measurements demonstrate what
Reproducibility
To convert 2.61×10 to the 5th power to ordinary, non-scientific notation move the decimal point to the what?
Right
Which limitation of science prevents the study of origins from being true science?
Science can study only created matter energy in the present
silicon
Si
Which of the following is not a principle of Dalton's atomic theory?
The mass of an atom is concentrated in the center called the nucleus
Which of the following describes the class creation of H2O2
compound and molecule
The law stating that the masses of each element is given a compound always have the same ratio as the law of what
definite composition
Which of the following subatomic particle does not have a charge
neutron
A general explanation of why some part of the universe behaves the way it is is called a
theory
By which of the following conversion factors should 102 mL be multiplied to convert it to liters
1/1000 mL
What value does the prefix micro represent?
10 -6 power
The value that equals an elements average atomic mass, but lacks unit is the elements what
Atomic weight
gold
Au
Match each element with the correct symbol Calcium
Ca
Which of the following is not a sign of chemical change?
Change in state
What is the atomic weight of chlorine if naturally occurring chlorine is 75.76% 35Cl(34.969 U) and 24.24% 37Cl (36. 966 u). Round your answer to two decimal places.
Change percentages to a decimal multiply the percentage by the chlorine u number added to the following percentage and chlorine u number
Which method of separating mixtures involves placing a drop of the mixture to be separated on a piece of absorbent paper and placing one edge of the paper and a suitable chemical solvent
Chromatography
When defining the problem, an engineer, first identified the criteria. Should be identified in this step of the engineering design process.
Constraints
