Elements
This element has the atomic symbol Rb.
Rubidium.
The charge of an electron is _______.
-1 or negative
A cloud weights 3.60 g and has a volume of 1.45x10^(5)mL. It has a density of ________.
2.48x10^(-5) g/mL.
There are __________ particles in one mole of substance. (Avogadro's #)
6.022x10^(23).
A substance that has a definite volume but not definite shape is in the _______ phase.
liquid.
These two elements make up the compound known as table salt.
Sodium (Na) and Chlorine (Cl).
The structure of a neutral Boron-10 atom.
5 protons and 5 neutrons in the nucleus with 5 electrons
500 grams of sugar occupies a volume of 0.315 liters. What is the density of the sugar in grams per milliliter?
1.587 g/mL
There are ______ moles in 2.13 g of carbon.
0.177 moles.
Chicken noodle soup is an example of a _________ mixture. (Homogeneous or heterogeneous).
Heterogeneous.
This element is located in Group 4A and Period 3.
Silicon (Si).
In the Kinetic Molecular Theory, all matter consists of small particles in ________, ________ motion. (2 answers)
constant random.
A soda has a a density of 4.71 g/cubic centimeter and a mass of 1.84x10^(8)micrograms. The soda has a volume of ________(mL).
39.1 mL.
There is a chunk of graphite(C) that weighs 5.67x10^(10) nanograms. There are _______ moles of Carbon in that chunk of graphite.
4.72 moles.
215.15 K is ________ degrees C.
-58.00.
This element has a molar mass of 15.999 g/mol.
Oxygen (O).
The structure of a neutral Nitrogen-15 atom.
7 protons and 8 neutrons in the nucleus with 7 electrons.
The density of a substance is 1.63 grams per milliliter. What is the mass of 0.25 liters of the substance in grams?
m = 0.4075 g
How many atoms of gold are in 1 gram of gold?
196.96 x 6.023x10^23 = 1.18x10^26 atoms.
Density, melting point, malleability, hardness, and color are all examples of _______ properties.
physical.
2 Parts! The elements Fluorine, Chlorine, Bromine, Iodine, and Astatine all belong to the ________ family (common name NOT Group #) and all have similar _________ properties.
Halogen and chemical.
The mass of one atom of Na is ____________(g).
3.8177x10^(-23)g.
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
How many moles of oxygen (O) are in 1 mole of calcium carbonate (CaCO3)?
3 moles
Percent abundance of isotopes of a given element are calculated by dividing __________ by ______________ and then multiplying by 100. (several words for each blank)
'The number of atoms for a given isotope' and ' The number of atoms for all isotopes'.