Density
What is the equation for density?
d = m / V
density = mass / Volume
What kind of property of matter can be observed with the senses?
A physical property
What are the starting substances for a chemical reaction called?
Reactants
What is the center region of an atom called?
The nucleus
What element has the atomic number 27?
Cobalt (Co)
What is the density of an object with a mass of 100 grams and a volume of 250 milliliters?
d = m / V = 100 g / 250 mL
d = 0.4 g/mL
A physical change
Which side of the arrow in a chemical equation are the products on?
The right side
Which subatomic particle does not have an electrical charge?
Neutron
What element can be found in period 3 group 17?
(period = row & group = column)
Chlorine (Cl)
What is the mass of an object with a density of 2 g/mL and a volume of 10 mL?
m = d x V = 2 g/mL x 10 mL
m = 20 g
Phase changes (different states of matter) are examples of what kind of change?
Physical change
What is the phase indicator for a substance in the aqueous state?
(aq)
What is the mass number of an atom with 7 protons, 7 neutrons, and 10 electrons?
mass number = p + n
7p + 7n = 14 mass number
What is the most common isotope of Potassium (K)?
Potassium-39
What is the volume of an object that has a mass of 50 grams and density of 10 g/cm3?
V = m / d = 50 g / 10 g/cm3
V = 5 cm3
Two liquids are combined and a solid precipitate is formed
Chemical change
What does the Law of Conservation of Mass state?
The mass of the reactants and products are equal
What are the electrons on the outermost ring of an atom called?
Valence electrons
How many neutrons does Carbon-14 have?
n = mass number - p
14 - 6 = 8 neutrons
What is the density of a block with a mass of 75 grams and the dimensions of 5 cm x 5 cm x 10 cm?
V = l x w x h = 5 cm x 5 cm x 10 cm = 250 cm3
d = m / V = 75 g / 250 cm3
d = 0.3 g/cm3
Sugar dissolved in hot coffee
Physical change
CH4 + 2O2 --> CO2 + 2H2O
If you combine 16 grams of CH4 with 64 grams of O2 and 44 grams of CO2 are produced, then how many grams of H2O will form?
mass of reactants = mass of products
16 g CH4 + 64 g O2 = 44 g CO2 + ? g H2O
16 + 64 - 44 = 36 g H2O
What is the charge of a Calcium atom with 19 electrons and 20 neutrons?
charge = p - e
20p - 19e = +1 charge
How many neutrons does the most common isotope of Nitrogen (N) have?
most common isotope: Nitrogen-14
14 - 7p = 7 neutrons