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Density
Physical vs Chemical
Chem Eq's & Conservation of Mass
Atomic Structure
Periodic Table & Isotopes
100

What is the equation for density?

d = m / V

density = mass / Volume

100

What kind of property of matter can be observed with the senses?

A physical property

100

What are the starting substances for a chemical reaction called?

Reactants

100

What is the center region of an atom called?

The nucleus

100

What element has the atomic number 27?

Cobalt (Co)

200

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

200
What kind of change keeps the composition of the substance the same after the change?

A physical change

200

Which side of the arrow in a chemical equation are the products on?

The right side

200

Which subatomic particle does not have an electrical charge?

Neutron

200

What element can be found in period 3 group 17?

(period = row & group = column)

Chlorine (Cl)

300

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

300

Phase changes (different states of matter) are examples of what kind of change?

Physical change

300

What is the phase indicator for a substance in the aqueous state?

(aq)

300

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

300

What is the most common isotope of Potassium (K)?

Potassium-39

400

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


400

Two liquids are combined and a solid precipitate is formed

Chemical change

400

What does the Law of Conservation of Mass state?

The mass of the reactants and products are equal

400

What are the electrons on the outermost ring of an atom called?

Valence electrons

400

How many neutrons does Carbon-14 have?

n = mass number - p

14 - 6 = 8 neutrons

500

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

500

Sugar dissolved in hot coffee

Physical change

500

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

500

What is the charge of a Calcium atom with 19 electrons and 20 neutrons?

charge = p - e

20p - 19e = +1 charge

500

How many neutrons does the most common isotope of Nitrogen (N) have?

most common isotope: Nitrogen-14

14 - 7p = 7 neutrons