Elements
What charge does a proton have?
positive
500 grams of sugar occupies a volume of 0.315 liters. What is the density of the sugar in grams per milliliter?
1.587 grams per milliliter
A large cylindrical tank contains 0.850 m30.850 m3 of nitrogen gas at 28.0∘C28.0∘C and 7.50×103 Pa7.50×103 Pa (absolute pressure). The tank has a tight-fitting piston that allows the volume to be changed. What will be the pressure if the volume is decreased to 0.480 m30.480 m3 and the temperature is increased to 157∘C157∘C
How many moles of copper are in 6,000,000 atoms of copper?
9.96 x 10-19 moles of copper
When a beam of white rays is dispersed by a prism which colour will be refracted to a larger extent?
Violet.
What charge does a neutron have?
no charge
The density of a substance is 1.63 grams per milliliter. What is the mass of 0.25 liters of the substance in grams?
407.5 grams
Which of the following gases will diffuse the quickest through a small hole?
H2
How many atoms are in 5 moles of silver?
3.01 x 1024 atoms of silver
The modern atomic mass unit is based on ____
Carbon-12.
What particles are in the nucleus of an atom?
nuetrons and protons
What is the mass of a 15 centimeter cube of iron if the density of iron is 7.87 grams/centimeter³?
26561 grams or 26.56 kilograms
Which of the following is not a characteristic of gases?
High densities
How many atoms of gold are in 1 gram of gold?
3.06 x 1021 atoms of gold
What do you mean by photoelectric effect?
Emission of electrons by electromagnetic radiation striking on a metal surface.
What is the atomic number?
the number of protons in an element
Which of the following is greater?
a. 7.8 grams per milliliter or 4.1 μg/μL
b. 3 x 10-2 kilograms/centimeters3 or 3 x 10-1 milligrams/centimeter3
7.8 grams per milliliter b. 3 x 10-2 kilograms/centimeter3
A container filled with fluorine gas and neon gas and has a total pressure of 8atm. There are 50g of fluorine gas in the container, and the fluorine gas exerts a pressure of 5atm.
15.9g
How many moles of sulfur are in 53.7 grams of sulfur?
1.67 moles of sulfur
A raincoat is made of what?
Polychloroethene.
All matter is made of
atoms
Two liquids, A and B, have densities 0.75 grams per milliliter and 1.14 grams per milliliter, respectively.
When both liquids are poured into a container, one liquid floats on top of the other. Which liquid is on top?
Liquid A. (0.75 grams per milliliter)
Which of the following is a physical property of gases?
Fluidity
How many grams are in a sample containing 2.71 x 1024 atoms of iron?
251.33 grams of iron.
What is the value of Planck’s constant in SI units?
6.625 x 10’34 Is.