Definitions for Unit 1 Test

Question 1

Empirical formula

Answer 1

the simplest whole number ratio of atoms in a compound

Question 2

Molecular formula

Answer 2

a formula giving the number of atoms of each of the elements present in one molecule of a specific compound

Question 3

Limiting reagent

Answer 3

The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.

Question 4

Excess reagent

Answer 4

reactants that are not used up when the reaction is finished

Question 5

Theoretical percent yield vs actual percent yield?

Answer 5

Theoretical yield is what you calculate the yield will be using the balanced chemical reaction. Actual yield is what you actually get in an chemical expirement. Percent yield is a comparison of the actual yield with the theoretical yield.

Question 6

molarity

Answer 6

Molarity is a unit of concentration expressed as the number of moles of dissolved solute per liter of solution.

Question 7

homogenous mixture

Answer 7

uniform composition and properties throughout

Question 8

heterogeneous mixture

Answer 8

non uniform composition and properties throughout and it is possible to see the separate components in a heterogenous mixture

Question 9

what is the kinetic theory

Answer 9

The Kinetic Molecular
Theory explains the forces between molecules and the energy that they possess. This theory is based
on three theories about matter. v

Question 10

mixtures are not chemically combined but intersperced? true or false

Answer 10

true they are not chemically combined

Question 11

describe the three characteristics for gasses, solids and liquids

distance between particles, shape and volume

Answer 11

solid = very tight distance between particles, fixed shape and volume

liquid= particles are looser than solids, fixed volume although no fixed shape.

gasses = very spread out particles, no fixed volume no fixed shape

Question 12

avagradros law

Answer 12

for equal volumes of gasses measured at the same temp and reassure, there will be the same number of particles

therefore volume is directly related to moles of gas

Question 13

what is gay lusscas law

Answer 13

at constant volume and number of particles, pressure and temperature are directly related, therefore as on increases so will the other

Question 14

dont forget

Answer 14

that real gasses have intermolecular forces, its just the ideal gas model that does not