Chem Test 1 Quizzes
Water freezes at a temperature of
0 degrees C and 273.15 K
How many L are in 75.3 mL?
0.0753
Decide on the correct answer
0.10 cal = 0.418 Joules
How many km are in 149 m?
0.149
What is the density, g/mL, of an object with the mass of 24.6 and volume of 81 mL?
0.304
Problem: A post-1982 penny has a density of 7.40 g/cm3 and a mass of 2.71 g. What is its volume?
0.366 cm3
How many g are in 494 mg?
0.494
A 346 mL gas at a pressure of 1.2 atm was subject to a change in the volume. If the final volume is 508 mL, what is the final pressure? Assumption: The temperature of the gas does not change.
0.82 atm
Draw the electron configuration of Na.
1s2, 2s2, 2p6, 3s1
Draw the electron configuration of Cl.
1s2, 2s2, 2p6, 3s2, 3p5
Draw the electron configuration of Ar.
1s2, 2s2, 2p6, 3s2, 3p6
What is the correct form of scientific notation for 0.00257?
2.57 x 10-3
Convert 71.2 degrees Fahrenheit to degrees Celsius
21.8
Convert 34.2 degrees Celsius to Kelvin
307.2
How many protons does arsenic have?
33
How many electrons does In have?
49
How many neutrons does Rh-103 have?
58
An element has two isotopes one with the mass of 7.0160 g with the abundance of 92.58%, and the second with the mass of 6.0151 g at abundance of 7.42%. What is the average atomic mass?
6.94
What is the correct form of scientific notation for 697?
6.97x102
Convert 34.2 degrees Celsius to degrees Fahrenheit.
93.6
Which atom has the lowest ionization energy?
Ca Mg Be Answer: Sr
Which atom is the largest?
He Al Ar Answer: Rb
In the space provided below, recommend a detail procedure as how you separate a mixture of sand and iron powder.
I would add water to the mixture of sand and iron powder. Next I would stir the mixture to make it more easily separable. I would then run a magnet through the mixture because the iron is magnetic and will stick. Finally I would use a strainer to retrieve the sand.
In the space provided below, recommend a detail procedure as how you separate a mixture of sand and salt.
I would add water to the mixture of sand and salt until the salt dissolves because it is soluble in water. Next I would collect the sand by pouring water through a filter or strainer. I would then recover the salt by boiling the water until the water evaporates and only the salt is left.
Choose the two elements in the same row on the Periodic Table.
Kr, Ba P, Bi Ga, N Answer: Sr, Sn
What is MgO called?
Magnesium oxide
Choose the two elements in the same group on the Periodic table.
Mg, Cl Cr, K I, Au Answer: Na, Cs
Which one is not part of the scientific method?
Observing and collecting data Formulating hypothesis Testing hypothesis Formulating theories Answer: none of them
What one is a metalloid?
P Se K Answer: As
Which one is a nonmetal?
Si At K Answer: Cl
Which one is a transition element?
Si Cl K Answer: Fe
Which one has the highest energy?
UV IR microwave Answer: x-ray
Blood is considered
a homogeneous mixture
What is released as an electron transitions from a higher to a lower energy level?
a photon of light
A bird feather and a wall nail were dropped from the same distance above the ground at the same time. Which one falls on the floor first in vacuum?
both will fall down at the same time
What is CaF2 called?
calcium fluoride
Gas densities are less affected by pressure and temperature than are the densities of solids and liquids.
false
Physical change: The oxygen we breathe, O2, is converted to ozone, O3, in the presence of an electric spark.
false
Short wavelength radiations contains less energy than long wavelength radiation.
false
The process of boiling water is a chemical change
false
Water is considered as as atom
false
Which one represents the correct unit for density?
g/cm3
A light bulb stops working in your kitchen. You suspect that either bulb is burned out or the circuit breaker is tripped. Your suspicion is an example of a scientific
hypothesis
What law does the equation PV=nRT represent?
ideal gas law
A biological cell is
microscopic
What is K2CO3 called?
potassium carbonate
A scientific hypothesis is a
testable assumption
A probability cloud is a close approximation of the actual shape of an electron's three dimensional wave.
true
Carbon dioxide is considered as a molecule
true
Some atoms link together to form larger units of matter called molecules
true
How many conversion factors can be made out of single equalities such as 1m = 100 cm?
two