Atoms
What particles do you find in the nucleus of an atom?
protons and neutrons
An object is measured to be 0.56 meters long. How many cm is that?
56.0 cm
What is easier to reverse, a physical change or a chemical change?
physical change
How many oxygen atoms are present in carbon dioxide?
Two
Is a sample of sugar dissolved water a homogeneous or heterogenous mixture?
homogeneous
what shape are p-orbitals?
dumbell shaped
Convert 76.0 kg into grams.
76,000 grams
Is an egg being cooked, a physical or chemical change?
chemical
What kind of compounds are formed between metals and non-metals?
Ionic compounds
How many molecules are in a mole?
6.02 x 10 23
Which two are isotopes?
a) 13 protons, 14 neutrons, 13 electrons
b) 14 protons, 14 neutrons, 14 electrons
c) 13 protons, 12 neutrons, 13 electrons
d) 15 protons, 16 neutrons, 15 electrons
a) and c)
How many significant figures does 0.001930 kg have?
four
Going from liquid to gas is called?
Vaporizing
When you burn fuel, what besides the fuel is used up?
oxygen
What color in the rainbow has the longest wavelength?
Red
How many valence electrons does potassium (K) have?
one
What is the formula to convert from celsius to Fahrenheit?
F = 9/5 (c0) + 32
The molecules (or atoms) that make up a substance have space in between the, and they are in constant, random motion. The hotter the substance, the faster the motion. What theory is this summarizing?
Kinetic Theory of Matter
What type of reaction occurs when a chemical reacts with oxygen to form one or more products as well as heat and usually light?
Combustion reaction
A positive ion is called a _________?
cation
Where an atom's valence electrons are most stable is called the electron's __________?
ground state
How many atoms are in 58.93 grams of cobalt (Co)?
6.02 X 1023
How many moles of H2 are needed to produce two molecules of NH3?
N2 + 3H2 = 2NH3
Three H2 molecules
What type of reaction is it which the only reactant is a compound, and the products are the elements from which the compound is made?
Decomposition reaction
What is a homonuclear diatomic?
A molecule consisting of two atoms of the same element