Review For Midterm Exam

Physical Science

Set up the a graph for the following experiment. For this, the time (sec) is the independent variable, and the distance (mi) is the dependant variable.

Time (seconds)

Dist

ance

(mi)

What part of the experiment is described in each sentence

1. One day you don’t wear any perfume at all.

2. While testing the different types, you spray the same amount on you each day. You take a shower and wash with the same soap and the same shampoo. You test the perfume by asking the same people how they like the perfume.

3. Each day you spray a different kind of perfume on yourself.

4. Each day a different number of people like the perfume best.

5. At the end of the experiment, you decide based on your data, people prefer the first perfume the best.

answer1. One day you don’t wear any perfume at all.

control2. While testing the different types, you spray the same amount on you each

day. You take a shower and wash with the same soap and the same shampoo. You test the perfume by asking the same people how they like the perfume. Constant

3. Each day you spray a different kind of perfume on yourself. Independent variable

4. Each day a different number of people like the perfume best. Dependent variable

5. At the end of the experiment, you decide based on your data, people prefer the first perfume the best.

conclusion

converting

1. 80kg = _______ g2. 565 cm = ________m3. 68 mg = _______hg4. 300 dg = _______mg

80000 g5.65m.00068hg30000mg

• How many millimeters in one hectometer?

• How many meters in one decameter?

100000

10

What is the volume of this liquid

52.8 ml

• Identify each material listed below as a pure substance or a mixture. 1. Nickel, Ni2. Coca-Cola 3. Snickers bar4. Sugar, C121H22O11

Pure subMixtureMixturePure sub.

• Identify each mixture listed below as heterogeneous or homogeneous. – Kool-Aid– Sand and water– Italian salad dressing

HomogenousHeterogenousheterogenous

• The density of a sample of wood is .85 g/mL. The mass of the wood is 24.5 grams. What is the volume of the sample?

28.8 mL

1.Between what letters is the substance a solid? 2.Between what letters is the substance melting? 3.Is it possible to change the temperature of a substance while you are changing its phase?

AB-CNo,

Which substance is more dense…why?

10

20

30

40

50

60

70

80

0 10 20 30 40 50 60 70 80volume (mL)

Mas

s (g

)

FIGURE 4: Mass and Volume Relationships

Substance A

Substance B

which block has greater mass?which block has greater volume?which block has greater density?

FIGURE 1 A B

A

BFigure 1

BBThey are equal in density

• Number of neutrons in 34S• Mass number of a phosphorus atom with 17

neutrons• Mass number of a boron atom with 7

neutrons

183212

• Calculate the average atomic mass for the following isotopes: (2 pts)

• 53Mn – 12% 54Mn – 74%57Mn – 14%

54.3 amu

• How many electrons are in each energy level of a Scandium atom?

• What charge ion will it probably form?

2 in the 1st 8 in the 2nd

9 in the 3rd

2 in the 4th

It will probably lose 2 electrons and have a charge of +2

• What is the charge and location of a– Proton– Neutron– electron

Proton: positive in the nucleusNeutron: neutral in the nucleusElectron: negative in energy levels in the electron cloud

• Believed that the atom was made of a nucleus and electrons that moved around the nucleus in set paths called orbits.

• Discovered the nucleus by conducting a gold foil experiment

• Thought that atoms where solid spheres• Thought that atoms were solid positive

spheres with bits of negative material.

BohrRutherfordDaltonThompson

• Symbol• Atomic #• Mass• Charge• Protons• Neutrons• electrons

Li360333

Forces that hold different atoms or ions together

bonds

• How many valence electrons do most atoms need to be stable?

• How many do H and He need?

• What type of bond occurs between 2 non metals

• What is the overall charge of any molecule?

8

2

Covalent

0

• Write the chemical formula for Sodium + Sulfur

• Write the chemical formula forManganese (III) Sulfide

Na2S

Mn2S3

• Write the name for N2O2

• Write the name for SrCl2

• Write the name for CrO3

Dinitrogen dioxide

Strontium chloride

Chromium (VI) oxide

A solid melts- is this a chemical reaction?

Bubbles are produced when a solid is added to a liquid- is this a chemical reaction?

A firecracker explodes- is this chemical reaction? How do you know?

For the reaction A + B + energy --> AB, is energy absorbed or released?No, physical- no new material is formedYesYes – energy is releasedabsorbed

• Balance the reaction: K3PO4 + HCl --> KCl + H3PO4

K3PO4 + 3HCl --> 3KCl + H3PO4

For the reaction AX + BY -->AY + BX, what type of reaction is this?

what are the products?

what are the reactants?

Double displacementProducts AY + BXReactants AX + BY