1

What is Matter? Classwork Name: _________________________

7th Grade PSI Science

1. If you have one atom of Oxygen and you break it in half, would you still have Oxygen? Explain.

2. Draw a model of an atom labeling all of its parts. On your model, identify which parts have a positive or negative charge or have no charge.

3. Explain what would happen if an electron and a proton were brought near each other and then released. Why would this happen?

What is Matter? Homework Name: _________________________

7th Grade PSI Science

4. How do we define “matter?”5. Can you think of anything that is not matter?6. What does it mean for a substance to be a “pure substance?”7. What subatomic particle has a neutral charge?8. Where are electrons found in the atom?

How Do We Measure Matter? Classwork Name: _________________________

7th Grade PSI Science

9. For each item below, identify the appropriate unit of measurement. The choices for the unit of measurement are: volume (V), weight (W), mass (M) or both mass and weight (MW).

a. _______ Amount of water in a pool

b. _______ Force of gravity on an apple

c. _______ Kilograms

d. _______ Amount of matter in a stone

e. _______ Newton

f. _______ Measured with a graduated cylinder

g. _______ Cubic meters

h. _______ Length x Width x Height

i. _______ Amount of juice in an orange

j. _______ Pounds

k. _______ Depends on location in a gravitational field

l. _______ Grams

m. _______ Measured with a scale

n. _______ Liters

10.Rank your weight on the surface of each of these locations from greatest to least. Justify your ranking to the right of the table.

Location

Ranking

Moon

Jupiter

Mercury

Earth

11. Describe how you would find the volume of the empty vase to the right. Note that the vase is too large to fit in a standard graduated cylinder.

How Do We Measure Matter? Homework Name: _________________________

7th Grade PSI Science

For each question below, show your work and/or justify your answer.

12.How many grams would be in 10 kilograms?13.A block has a mass of 10 kg on Earth and a weight of 60 lbs. What would its mass

and weight be on the moon? 14.A box has a length of 10 cm, a width of 8.5 cm and a height of 5.5 cm. What is its

volume?15.An irregular object is placed in 50 mL of water and the water level rises to 72 mL.

What is the volume of the object?16.Explain why the following statement is incorrect and then correct it: The apple

weighs 1 kilogram.

Elements of the Periodic Table Classwork Name: _________________________

7th Grade PSI Science

17.What did Mendeleev use to organize his first Periodic Table of Elements?

18.What is the symbol for Magnesium?

19.Which element is represented by the symbol C?

20.What period is Hydrogen (H) located in?

21.What group is Sulfur (S) located in?

22.Pick another atom with similar characteristics for each of these elements:a. Fluorine (F)

b. Oxygen (O)

Elements of the Periodic Table Homework Name: _________________________

7th Grade PSI Science

23.How is the modern Periodic Table of Elements arranged?24.Use your Periodic Table to answer the following questions about Helium (He):

a. Atomic number?b. Element symbol?c. Atomic mass?d. Number of protons?e. Period?f. Group?g. Number of electrons in outer shell?

25.Suppose an element had an atomic number of 52. How many protons would that element have?

26.Using your Periodic Table, what element has an atomic number of 65?27.Using your Periodic Table, which element has more protons: Nickel or Iodine? How

do you know?28.Which element is represented by the symbol W?29.What period is Silver (Ag) located in?30.What group is Xenon (Xe) located in?31.Pick another atom with similar characteristics for each of these elements:

a. Potassium (K)b. Krypton (Kr)c. Strontium (Sr)d. Gold (Au)

Physical Properties Classwork Name: _________________________

7th Grade PSI Science

32. An unidentified clear liquid substance is found in the chemistry lab. One of your lab partners claims it is simply water while the other thinks it is isopropyl alcohol.

a. What physical properties would NOT be helpful in identifying the substance and why?

b. Explain which physical properties could be used to identify the substance and how you and your lab partners would test these physical properties.

33.Describe the physical properties of a tent that are important if you are going camping for the weekend. For each physical property described, explain why it is important.

34.You are given a mixture composed of finely ground salt and pepper and coarse sand. Explain how the physical properties of each item can help you separate them.

Physical Properties Homework Name: _________________________

7th Grade PSI Science

35.Explain what physical properties of metal would be a good choice of material for each of these products and why:

a. Cooking potb. Power linesc. Refrigerator door

36.Describe how the difference between metals and nonmetals can be detected.37.For each item below, choose the most appropriate term. In some cases, you may

have more than one term listed: compound (C), molecule (M), element (E) or atom (A).

a. ______ Basic unit of an element

b. ______ Water

c. ______ Pure substance

d. ______ Smallest part of a compound

e. ______ O3

f. ______ salt

g. ______ Carbon

h. ______ Two or more elements chemically bonded together

i. ______ The subscript in H2O

j. ______ C6H12O6

k. ______ One or more atoms that are chemically bonded together

38.Write the name of the family that is described in a-g:a. Does not react with other elementsb. End in –inec. React by losing 2 electronsd. Poor conductor of electricitye. 1 electron in the outer shellf. Contains many unstable elements that do not occur naturally on earthg. Can be mixed with other metals to make alloys

39. CaCO3, CO2, CuSO4, NaHCO3 Rank the compounds listed above from greatest to least based on:

a. The number of different elements.b. The total number of atoms.

40.What is the ratio of Sodium (Na) to Chlorine (Cl) atoms in the chemical formula NaCl? _________

41.The ratio of Carbon to Oxygen atoms in Carbon Dioxide is 1:2. How would you write its formula? _________________

42.The molecule commonly known as Acetylene (C2H2) is made up of what types of atoms (and how many of each)?

43.The molecule commonly known as Nutrasweet (C14H18N2O5) is made up of what types of atoms (and how many of each)?

Density Classwork Name: _________________________

7th Grade PSI Science

44.Complete the table below. Show your mathematical work on another sheet of paper. A periodic table displaying the density of elements is provided to help you.

Mass (g) Volume(cm3) Density (g/cm3) Element

345.5 356.1

155.3 57.5

94.2 4.54

10.13 2.7

59.6 7.13

4.88 3.14

53.6 23

Answer the following questions.

45.Can a sample of an element be identified by its mass alone? Why or why not?

46.Suppose you had samples of equal mass for every element on the periodic table.a. Which elemental sample would contain atoms that are the most closely

packed together? Justify your answer.

b. The least closely packed? Justify your answer.

47.You have one 3g sample of Nickel and one 3g sample of Manganese. a. Which sample takes up more physical space? Justify your answer.

b. Would either sample float in water? Why or why not?

48.A graduated cylinder is filled with 50mL of water. A sample of gold with a mass of 39.5 grams is dropped into the water. What will be the new water level on the graduated cylinder? Justify your answer.

Periodic Table of the Elements, Density (g/cm3) (25 oC)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

1 H 0.090

He 0.178 

2 Li 0.53

Be 1.85 

B 2.34

C 2.26

N 1.251

O 1.429

F 1.696

Ne 0.900 

3 Na 0.97

Mg 1.74

Al 2.70

Si 2.33

P 1.82

S 2.07

Cl 3.214

Ar 1.784 

4 K 0.86

Ca 1.55

Sc 2.99

Ti 4.54

V 6.11

Cr 7.19

Mn 7.44

Fe 7.874

Co 8.89

Ni 8.91

Cu 8.96 

Zn 7.13

Ga 5.91

Ge 5.32

As 5.78

Se 4.79

Br 3.12

Kr 3.75 

5 Rb 1.53

Sr 2.54

Y 4.47

Zr 6.51

Nb 8.57

Mo 10.22

Tc 11.49 

Ru 12.37

Rh 12.41

Pd 12.02

Ag 10.49

Cd 8.65

In 7.31

Sn 7.31

Sb 6.69

Te 6.24

I 4.93

Xe 5.9 

6 Cs 1.87

Ba 3.59

Lu 9.84 

Hf 13.31

Ta 16.65

W 19.25

Re 21.03

Os 22.61

Ir 22.65

Pt 21.45

Au 19.32

Hg 13.55

Tl 11.85

Pb 11.35

Bi 9.75

Po 9.20 At Rn 

9.73 

7 Fr Ra 5.50 Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Fl Lv

Lanthanides La 6.15

Ce 6.77

Pr 6.77

Nd 7.01

Pm 7.22

Sm 7.52

Eu 5.24

Gd 7.9

Tb 8.23

Dy 8.55

Ho 8.8

Er 9.07

Tm 9.32

Yb 6.97

Actinides Ac 10.07

Th 11.72

Pa 15.4

U 18.95

Np 20.2

Pu 19.84

Am 13.7

Cm 13.5 Bk Cf Es Fm Md No

http://chemistry.bd.psu.edu/jircitano/density.html

Density Homework Name: _________________________

7th Grade PSI Science

For each question below, show your work and/or justify your answer.

49.What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3?

50. I threw a plastic ball in the pool for my dog to fetch. The mass of the ball was 125 grams. What must the volume be to have a density of 0.500 g/mL? (I want it to float of course!)

51.What is the mass of a 12cm3 sample of pure silicon with a density of 9 g/cm3?52.A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0

grams. What is the density of the wood? Would the piece of wood float in water? (Hint: recall how to determine the volume of a rectangular shaped object)

53.A strand of gold-colored metal beads was measured to have a mass of 425 grams. The beads are placed in a graduated cylinder where the original water level was 10mL. After the beads are placed in, the new water level in the graduated cylinder is 58mL. Given the following densities, identify the metal:

Gold 19.3 g/mL

Copper 8.86 g/mL

Bronze 9.87 g/mL

54.An ice cube measuring 5.80 cm by 5.80 cm by 5.80 cm has a density of 0.917 g/mL. What is the mass?

55.The density of aluminum is 2.70 g/mL. If the mass of a piece of aluminum is 244 grams, what is the volume of the aluminum in cm3?

States of Matter Classwork Name:__________________________

7th Grade PSI Science

For each image below, identify an example of each common state of matter. Be sure to include scientific evidence that justifies your identified examples. Also determine whether the solid identified is crystalline or amorphous and justify your answer.

56. Root Beer Float

Solid:

Liquid:

Gas:

57.Hot Air Balloons over a lake

Solid:

Liquid:

Gas:

58. Ice lake Solid:

Liquid:

Gas:

59.Geyser

Solid:

Liquid:

Gas:

States of Matter Homework Name: _________________________

7th Grade PSI Science

Use the word/phrase bank below to complete the Venn Diagram.

Gas

SolidLiquid

Word Bank

Definite volume Particles slide past each other

Particles vibrate in place

Definite shape Cannot be compressed MatterAtoms Molecules Has massParticles have highest energy

H2O at 27°C No definite volume

Amorphous No fixed Shape CrystallineParticles are very close together

Particles are not very attracted to each other

Fluid

Next, come up with two examples of each state of matter and write them in the correct place on the Venn Diagram.

Changes of State Classwork Name: _________________________

7th Grade PSI Science

The diagram below shows the water cycle- the movement of water throughout the Earth. Study the diagram and then use it to complete the following questions.

60.Label the arrows that represent evaporation with the letter ‘E’. Describe what is happening in these locations in terms of the thermal energy and temperature of the water.

61.Label the arrows that represent condensation with the letter ‘C’. Describe what is happening in these locations in terms of the thermal energy and temperature of the water.

62.Label any area on the figure where freezing might occur with an ‘F’. Describe what is happening in these locations in terms of the thermal energy and temperature of the water.

63.Are there any areas on the figure where boiling may occur? If so, label these areas with a ‘B’ and explain why you think it could occur there.

64.At what locations will H20 moleculesa. have the highest energy? Explain.b. have the lowest energy? Explain.

65.According to the diagram, water is never added or removed from Earth’s system. Explain how this is possible.

Changes of State Homework Name: _________________________

7th Grade PSI Science

66.Why is a substance’s melting point and freezing point the same? Explain your answer in terms of thermal energy.

67.What differences are there between the two types of vaporization?

68.How can you tell that water is boiling? How can you tell that water is evaporating?

69.For a-d, write E if the sentence is referring to Evaporation and C if it is referring to Condensation:

a. A substance changes from a liquid to a gas.b. More molecules are breaking free from a liquid than joining it.c. More molecules are joining together with a liquid rather than leaving it.d. Molecules of water vapor are colliding and sticking together in the air.

For #70-75, identify the state of matter of the substances below at room temperature. Plot and label 0 °C, the melting point (MP), the boiling point (BP), and room temperature (RT, 20 °C) on a number line.

70.Mercury MP -39 °C BP 357 °C71.Nickel MP 1455 °C BP 2913 °C72.Silicon MP 1414 °C BP 3265 °C73.Bromine MP -7 °C BP 59°C74.Chlorine MP -102°C BP -34°C75.Zinc MP 420°C BP 907°C

Chemical Properties Classwork Name: _________________________

7th Grade PSI Science

76.How do physical properties differ from chemical properties?

77.Where can the most reactive elements be found in the Periodic Table? Where can the least reactive elements be found?

Chemical Properties Homework Name: _________________________

7th Grade PSI Science

For #78-86, label each of these properties as chemical (C) or physical (P). Explain your choice.

78.Density79.Tendency to corrode80.Odor (scent)81.Boiling/Melting Point82.Reacts with acid83.Solubility (dissolves)84.Flammability85.Reacts with Oxygen 86.Texture