Measurements
& Sig Figs
& Sig Figs
To satisfy the Law of Conservation of Mass, you balance a chemical equation by modifying these numbers, never the subscripts.
What are coefficients?
Pure liquid water H₂O(l) is classified as this specific category of matter.
What is a compound?
Atoms of the same element that differ in their mass number due to a different number of neutrons
What are isotopes?
Name PCl5.
What is phosphorous pentachloride?
How many cm are in 63m?
6300 cm
The missing coefficients required to balance this reaction:
____ H2 + ____O2 --> ____ H2O
What are 2, 1, 2?
Black gunpowder contains distinct, visible grains of sulfur, charcoal, and potassium nitrate, making it this type of mixture.
What is a heterogeneous mixture?
Identify the number of protons, neutrons, and electrons in a neutral atom of Cl-37.
What are 17 protons, 20 neutrons, and 17 electrons?
Find the chemical formula for octaselenium pentachloride.
What is Se8Cl5?
The number of atoms in 3 moles of aluminum.
What is 1.806 x 1024 atoms?
The total mass of exactly 2.00 moles of pure sodium hydroxide (NaOH).
What is 80.0g? (Molar mass ~40.0 g/mol)
When reading an analog graduated cylinder, this rule dictates how you report the final digit of the measurement.
What is estimating one digit beyond the smallest marked graduation?
State two general physical properties that distinguish metals from nonmetals.
What are electrical conductivity, malleability, ductility, or lustrous appearance?
Write the chemical formula for barium sulfate.
What is BaSO4?
How many milligrams is equal to 5.70 kilograms?
5,700,000 mg
The number of carbon atoms present in a 3.00 mol sample of pure elemental carbon.
What is 1.81 x 1024 atoms?
Describe both the particle arrangement and kinetic movement of matter in the gaseous state.
What is randomly arranged/far apart, and moving rapidly/clashing constantly?
Explain how to use APEMAN.
What is A = P = E (Atomic Number = Protons = Electrons) and M - A = N (Mass Number - Atomic Number = Neutrons)?
Name NiCrO4.
What is nickel (II) chromate?
How many seconds is 16 weeks?
9676800 sec
For the balanced reaction N2 + 3H2 -->2NH3, calculate the mass of NH3 produced if 28.02 g of N2 reacts completely with excess H2.
What is 34.06 g?
A student is given a beaker containing sand, salt, and liquid water. Describe the exact laboratory separation steps needed to isolate the pure salt from this mixture, and state whether the original beaker content was a homogeneous or heterogeneous mixture.
What is: First, use filtration to separate the insoluble sand. Next, use evaporation or distillation to boil off the water, leaving pure salt behind. The original beaker was a heterogeneous mixture.
What is the chemical formula for the compound that forms between K and P.
K3P
Draw NO3-.
Teacher verifies.
You're throwing a pizza party for 15 people and figure each person will eat 4 slices. You call up the pizza place and learnt that a large pizza will cost you $14.78 and it will be cut into 12 slices. How much is the pizza going to cost?
$73.90