CHEM SOL REVIEW DAY 4SOLS 1 & 5

SCIENTIFIC INVESTIGATIONSA ___________________ is an explanation that might be true and can be tested.

HypothesisThe factor that is changed in the experimental group is the _____ variable. It is plotted on the x-axis.

Independent

SCIENTIFIC INVESTIGATIONSWhat you measure in an experiment is called the ________________ variable. It is plotted on the y-axis.

DependentName 3 good safety rules for a Chemistry lab.

UNIT 1 – SCIENTIFIC MEASUREMENT

Write the following numbers in scientific notation.

52, 300 5.23 x 104

0.0353.5 x 10-2

UNIT 1 – SCIENTIFIC MEASUREMENT

The measure of how close a measurement is to what it should be is called the ____

AccuracyThe repeatability of a measurement is called ____

Precision

UNIT 1 – SCIENTIFIC MEASUREMENTWhich of the following is both accurate and precise?

UNIT 1 – SCIENTIFIC MEASUREMENT

I conduct an experiment and measure the mass of a substance as 7.31 g. The accepted value is 7.5 g. What is the percent error?

(7.5-7.31) / 7.5 x 1002.5%

2009 SOL QUESTIONA student determined that the

density of a sample of tin is 8.00 g/mL, when the actual density is 7.28 g/mL. What is the percent error?

F 0.72%G 9.0%H 9.9%J 91%

UNIT 1 – SCIENTIFIC MEASUREMENT

How many significant figures are in each of the following numbers?2.030.0086078,00050014.0 x 104

2009 SOL QUESTIONA compound has a mass of 2.6632 x 102 g/mol. The number of sig figs in this mass is –

F 2G 4H 5J 7

UNIT 1 – SCIENTIFIC MEASUREMENTWhen measuring volume with a

graduated cylinder, be sure to measure at the bottom of the ________________

 MeniscusWhen measuring temperature, do not

allow the thermometer to touch the _______________ of a beaker or other container.

 Bottom or sidesMass is typically measured in _________Grams

UNIT 11 - SOLUTIONS

Label this graph

UNIT 11 - SOLUTIONSLabel the phases in the phase diagram below.

UNIT 11 - SOLUTIONSLabel the triple point in the phase diagram below.

Critical point

UNIT 11 - SOLUTIONSLabel the normal melting point in the phase diagram below.

Normal boiling point

2009 SOL QUESTIONWhen 1 g of NaCl is placed in 100g of water, a solution results. Once the solution is prepared, water is now considered what part of the solution?

F SoluteG Solvent

UNIT 13 – EVERYTHING ELSEVaporization is an _____ process.  EndothermicFreezing is an ______process.  ExothermicHeat (q) is the ________ of energy between objects at different temperatures.

Transfer

UNIT 13 – EVERYTHING ELSEHeat is an ________ property --- it depends on the amount of the substance present.

 ExtensiveThe total energy content of a sample is called its __________.

Enthalpy

UNIT 13 – EVERYTHING ELSEWhat kind of reaction is shown in the graph below?

UNIT 13 – EVERYTHING ELSEThe measure of disorder or

randomness in a system is called the ______________________.

EntropyA catalyst is a substance that speeds

up the reaction by ___ the activation energy.

Lowering Increasing the temperature,

concentration, pressure, or surface area of a substance will ______ the reaction rate.

Increase

UNIT 13 – EVERYTHING ELSELabel this graph

A

C

B

D

UNIT 13 – EVERYTHING ELSEWhen the forward and reverse

reactions happen at the same rate, it is called ___

Chemical equilibriumGive an example of a completion

reaction.Le Chatelier’s principle states that

when a system is at equilibrium is disturbed, the system adjusts in a way to ______________ the change.

Reduce

UNIT 13 – EVERYTHING ELSEIncreasing the concentration of

the reactants will make the ______ reaction faster than the reverse.

Forward This is called a shift __________.Right An oxidation reaction is one in

which electrons are __________.Lost

UNIT 13 – EVERYTHING ELSEAssign oxidation numbers to each

element in each of the following.K+

 1+O20CaH2 Ca = 2+, H =1-NH4

-

H = 1+, N = 5-