Chemistry Midterm Exam

3. Convert a speed of 88 m/s to its equivalent in cm/s. 8800.0 88000.0 8.9 x 10-3 .0800

8800.0

6. Convert the speed of light (3.00 x 108 m/sec) to km/year. 9.05 x 1014 km/yr 9.67 x 1013 km/yr 9. 1 x 1012 km/yr 9.5 x 1012 km/yr

9.5 x 1012 km/yr

25. What is the electron capacity for period number 7? 50 32 110 98

98

7. What letter does the superscript represent? A Z X Y

A

Which of the following is not a chemical property? chemical stability oxidation state flammability density

density

Which of the following is not a physical change? density mixing grinding tearing

density

Name of Cr2O72-. borate dichromate chromate permanganate

dichromate

31. Name for H2PO4-. phosphite dihydrogen phosphate phosphate hydrogen phosphate

dihydrogen phosphate

32. Name for Cr2O7-2. sulfate thiosulfate dichromate sulfite

dischromate

12. The smallest subatomic particle is the neutron electron nucleon proton

electron

17. What type of equation is O + e- -------> O-

electron affinity

2. The volume of an atom is found in the _____________________________________. electron cloud e- capacity nucleus entire atom

electron cloud

A _______________ property is any characteristic of matter that depends on the amount of matter being measured.

extensive physical

Heat of combustion is a physical property. True False

false (chemical property)

Mass is an intensive property. True False

false (extensive)

The boiling point is an extensive property. True False

false (its intensive)

Mixing is a type of chemical change. True False

false (physical change)

Water changing phase from a liquid to a solid is a chemical change. True False

false (physical change)

A release of odor is an indication that a physical change has happened. True False

false (when an odor is released a chemical change has occurred)

8. Based on the e- configuration of oxygen, an oxygen atom will ________________ valance e- when bonding with sodium.

gain 2

7. Nuclear decay with no mass nor charge:

gamma

17. Which family has 7 valance electrons? alkali earth noble gases halogens oxygen

halogens

16. Name of HPO42- phosphite hydronium acetate hydrogen phosphate

hydrogen phosphate

26. Name of HPO42-. dihydrogen phosphate phosphate phosphite hydrogen phosphate

hydrogen phosphate

Name of H3O+. thiocyanate ammonium hydronium hydroxide

hydronium

20. Name of ClO-. chlorite chlorate perchlorate hypochlorite

hypochlorite

3. The second element in an ionic compounds ending is changed to ___________.

ide

16. Electron affinity ________________ as you go up a group.

increases

Density is an ____________________ property.

intensive (physical)

5. A charged particle is called a(n) trion anion ion cation

ion

9. When sodium and chlorine react, chlorine removes sodium's valence electron and an ____________ ______________ forms between them.

ionic bond

7. An ionic compound is formed between two ____________. Correct!

ions

20. What is the name of Fe2O3?

iron (III) oxide

9. The same element with a different number of neutrons is a(n) isotope anion cation ion

isotope

22. Which elements were once call "rare earth metals"? actinides chalcogens halogens lanthanides

lanthanides

11. Generally, alkali metals need to ______________ e- to complete their octets.

lose

14. How many e- will Al lose or gain to become stable ?

lose 3

10. Which formula is used to find q if the temperature of water changed from 45 degrees C to 78 degrees C? (Use graph in notes) mCpΔT Hvap mCpQ Hfus

mCpΔT

17. Name of Hg22+. hydronium bisulfate ammonium mercury (I)

mercury (I)

2. In an ionic compound, the ______________ is always written first.

metal (cation)

14. The formula for the principle energy level number of the f block is (don't use any spaces)

n-2

13. The overall charge of an atom is neutral positive none of these negative

neutral

15. Name the compound: NiCl2 6 H2O.

nickel (II) chloride hexahydrate

13. Name of NO3-. nitrate peroxide nitrite azide

nitrate

5. A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3 g/cm3. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. Is it gold? no yes not sure maybe

no

9. 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? Density of water is 1 g/cm3. a little no yes none of these

no

18. Which family is stable? halogens noble gases chalcogens boron

noble gases

5. The second element in a covalent compound is a ____________________________________.

nonmetal

12. What type of bond is formed between Cl ---- Cl?

nonpolar covalent

18. Electrons in orbitals have to have an _______________ spin.

opposite

What is the name of C2O4-2 ? thiosulfate oxalate cyanide chromate

oxalate

5. If more than one polyatomic ion is needed in a formula, __________________ must be used.

parentheses

Name of ClO4-. perchlorate hypochlorate borate ammonium

perchlorate

Formula for MnO4- perchlorate nitrate permanganate borate

permanganate

30. Name for PO33-. hydrogen phosphate dihydrogen phosphate phosphate phosphite

phosphite

Mass and volume are examples of ______________________ properties.

physical extensive

Which type of changes are reversible? ____________________

physical intensive extensive

10. The charge of the nucleus of any atom is none of these positive neutral negative

positive

6. Metals have a _______________ charge.

positive

4. Using "2p4", what does the number 2 stand for?

principle energy level

Reactants -----> _______________

products

3. Which two subatomic particles are found in the nucleus of an atom? protons and neutrons none of these neutrons and electrons protons and electrons

protons and neutrons

12. What is the formula for silver cyanide?

AgCN

8. Least penetrating nuclear decay

Alpha

1. You decide you want to carry a boulder home from the beach. It is 30 centimeters on each side, and so has a volume of 27,000 cm3. It is made of granite, which has a typical density of 2.8 g/cm3. How much will this boulder weigh in pounds? Correct Answer 166.5 lbs 76000 g 167.3 lbs You Answered 75600 g

Answer 166.5 lbs

1. Which group 7 element has the least attraction for electrons? Put either the symbol or the name of the element

At/ iodine

6. One half the distance between the nuclei of two atoms or from the nucleus to the outer e- cloud is the _______________________ ____________________________.

Atomic Radius

8. Who stated that electrons are lazy and want to fill the lowest energy level?

Aufbau

6. Using the diagram, which formula would you use to calculate q for heat of fusion? (use diagram in notes) A to B B to C C to D D to E

B to C

11. In which direction would the arrow point during a dipole moment for B ---- O?

right

11. What is the formula for barium sulfite heptahydrate? Put a space between the formula and the hydrate.

BaSO3 7H2O

14. Formula for oxalate. C2O42- S2O82- Cr2O72- HCO3-

C2O42-

Formula for cyanide. CN- CrO42- PO43- CO32-

CN-

10. Complete the nuclear equation below. Write the symbol of the stable isotope. 42K undergoes alpha decay

Cl/ Cl-38

18. Write the formula for dichlorine monoxide.

Cl2O

6. What is the formula for chlorine trifluoride? Do not put any spaces.

ClF3

20. Formula for chlorite. H3O+ HPO42- O22- ClO2-

ClO2-

7. A 50 g sample of an unknown metal is heated with 800 joules. If the temperature of the metal increases by 41.6oC, what is the identity of the unknown metal? Cp of copper=0.385 Cp of iron=0.444 Cp of silver=0.240 Cp of aluminum=0.900 Silver Aluminum Iron Copper

Copper

16. Name this compound. Cu(NO3)2

Copper (II) nitrate

19. Formula for chromate. CO32- CN- CrO42- CNS-

CrO42-

10. Write the formula for Copper (I) hydroxide.

CuOH

7. The ionization energy ___________________ as you go down a group.

Decreases

23. What is the name of Na2Cr2O7?

sodium dichromate

6. Element Q has three valence electrons and is on period 4. What is the name of element Q? Sc Tl Ga Y

Ga

14. Write the formula for gallium (III) oxide monohydrate. Put a space between the formula and the hydrate.

Ga2O3 H2O

2. When naming covalent compounds, you use the _____________ numerical prefixes.

Greek

12. Formula for bicarbonate. HCO3- PO43- Hg22+ PO33-

HCO3-

Formula for bisulfate. OH- NH4+ CNS- HSO4-

HSO4-

9. Who stated that only one electron will go into an orbital before one fills?

Hund

21. Which two groups will form bases with water? II and III I and III VI and VII I and II

I and II

20. An electronegativity difference of 2.0, would form a(n) ________________ bond.

Ionic

1. Sodium's symbol is based off of the _________________ name of the element. Greek Latin English French

Latin

4. What is the name for the formula Pb(C2H3O2)2?

Lead (II) acetate

7. Based on the e- configuration of Lithium, Li, and oxygen, O, the chemical formula for the most likely compound between these two elements would be _______________. Do not put any spaces.

Li2O

15. Who is credited with coming up the the periodic table of elements? Mendeleev Einstein Mosley Newlands

Mendeleev

17. What is the name of HgCl2 ?

Mercury (II) chloride

14. Which element in the pair has a higher electronegativity value? C, N

N

22. Formula for nitrite. NH4+ NO4- NO2- NO3-

NO2-

13. Put the following groups of elements in order of increasing ionization energy. Al, S, Na

Na, Al, S

8. Write the formula for sodium carbonate.

Na2CO3

1. Write the formula for sodium hydroxide. No spaces

NaOH

Formula for peroxide. ClO4- CNS- O2-2 BO33-

O2-2

18. Formula for peroxide. O22- N3- CrO42- OH-

O22-

Formula for hydroxide. NH4+ H3O+ O22- OH-

OH-

Formula for phosphate. N3- PO43- PO33- OH-

PO43-

10. Who stated that only two electrons can fill an orbital and they must have opposite spins?

Pauli

3. The inhalation of radon-222 and its decay to form other isotopes poses a health hazard.Write balanced nuclear equations for the decay of radon-222. Write the symbol for the final stable isotope. •Alpha: •Alpha: •Beta: •Beta: •Beta:•Alpha: •Beta:•Alpha:

Pb

13. Write the symbol for the stable isotope that occurs when Ce-144 goes through beta decay.

Pr

8. Element X has 8 valence electrons and has 6 energy levels. What is the name of element X? Xe Rn At Kr

Rn

27. Formula for sulfate. SO32- SO42- S2O82- S2O32-

SO42-

Convert 195.7 in2 to m2. 1.3 m2 .133 ms 0.1 m2 .013 m2

0.1 m2

15. What is the electron configuration for Mo? Write it straight across with no spaces.

1s22s22p63s23p64s23d104p65s14d5

19. How many valence electrons does Pb have? 5 6 3 4

4

20. What is the noble gas configuration for Br? Write in a straight line and no spaces.

Ar4s23d104p5

15. Is H2O a covalent compound or an ionic compound? Put C for covalent or I for ionic compound.

C

3. Is the following compound an ionic compound or a covalent compound? P4S6

C

11. Which noble gas (symbol) would I use to write the noble gas configuration for W?

Xe

20. What is the name of ZnNO3?

Zinc nitrate

1. Using the figure above, list each type of decay that uranium-238 goes through to become lead-206. (chart on test)

a, b, b, a, a, a, a, a, b, b, a, b, b, a a,b,b,a,a,a,a,a,b,b,a,b,b,a

10. Which of these elements has the least attraction for e- in a chemical bond? a. nitrogen b. chlorine c. oxygen d. fluorine

a.

18. Which ion has the smallest radius? a. Cr +6 b. Cr +4 c. Cr +3

a.

Name NH4+ ammonium azide hydroxide phosphate

ammonium

10. Write the name for NH4NO3.

ammonium nitrate

11. A negatively charged atom is a(n) anion trion canion cation

anion

21. Write the formula for iron (II) acetate. No spaces.

Fe(C2H3O2)2

18. Which is an example of an ion? Fe+2 or Fe

Fe+2

9. Write the formula for iron (II) phosphate. No spaces

Fe3(PO4)2

12. Write the formula for Iron (II) chloride.

FeCl2

8. The least electronegative element is

Fr

3. What type of bond will be formed between C ----- O?

Polar Covalent

21. Name of C2H3O2-. azide thiocyanate ammonium acetate

acetate

16. The family name of group IIA is the _________________________________ family. alkali metal halogens transitional metals alkali earth

alkali earth

15. 40K -----> 40Ca + _______ Which type of decay did K-40 undergo? Write the name.

beta

9. Nuclear decay that can be stopped by aluminum

beta

Name of HSO4- permanganate nitrate ammonium bisulfate

bisulfate

29. Name of HSO3-. thiosulfate sulfate sulfite bisulfite

bisulfite

4. Calcium is calcium because of its mass number atomic mass atomic number atomic weight

atomic number

6. What is the abbreviation f stand for?

fundamental

13. What is the name of NO3-1 ?

nitrate ion

23. What is the name of the element that has 5 valence electrons and two energy levels? nitrogen oxygen carbon phosphorous

nitrogen

3. Which sublevels are on principle energy level 3?

s, p, d

24. What is the name of ZnO?

zinc oxide

4. Write the formula for ammonium sulfate. No spaces

(NH4)2SO4

5. The half-life of Po-218 is three minutes. How much of a 2.0 g sample remains after 15 minutes?

.0625

4. An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain?

.125mg

16. What is the total charge for PO4?

0

25. The oxidation numbers in an ionic compound always equal ____________.

0

9. How many valence e- are transferred from the phosphorus atom to barium in the formation of the compound barium phosphide? __________________

0

4. Convert -459.67 degrees Fahrenheit to Kelvin. 2 K -1 K -1.02 K 0 K

0 K

14. Titanium-51 decays with a half life of 6 minutes. What percentage of titanium would remain after one hour? Do not round any numbers and put the entire answer.

0.09765625

5. If a 3.1g ring is heated using 10.0 calories, its temperature rises 17.9°C. Calculate the specific heat capacity of the ring. 1.09 cal/g °C .23 cal/g °C .015 cal/g °C 0.18 cal/g °C

0.18 cal/g °C

1. It takes 487.5 J to heat 25 grams of copper (Links to an external site.) from 25 °C to 75 °C. What is the specific heat in Joules/g·°C? 0.39 J/g·°C .339J/g·°C .37 J/g·°C .45J/g·°C

0.39 J/g·°C

4. What is the electronegativity difference in arsenic and sulfur? Do not round.

0.4

7. Calculate the density of a rectangular prism made of metal. The dimensions of the prism are: 5 cm by 4 cm by 5 cm. The metal has a mass of 50 grams. 0.5 g/cm3 3.6 g/cm3 .75 g/cm3 1.5 g/cm3

0.5 g/cm3

13. How many electrons would be in the third p orbital of S?

1

16. How many orbitals does the s block have?

1

19. How many valence electrons does Cu have?

1

19. What is the oxidation number for Ag?

1

2. Which of the following in C ----- H would have a partial positive charge? a. C b. H

b.

15. What is the density of a cube of sugar weighing 11.2 grams (Links to an external site.) measuring 2 cm on a side? 1.45 g/cm3 1.4 g/cm3 2.1 g/cm3 1.5 g/cm3

1.4 g/cm3

11. The volume (45 ml) of a solution was measured in a graduated cylinder (shown below). If the mass of solution is measured to be 60.75 grams, what is the density of the solution? 1.45 g/ml 1.78 g/ml 1.0 g/ml 1.4 g/ml

1.4 g/ml

14. If the density of a diamond is 3.5 g/cm3 , what would be the mass of a diamond whose volume is .5 cm 3 ? 1.86 g 1.8 g 1.9 g 2.1 g

1.8 g

10. How many significant digits are in 102.0943500? 11 6 7 10

10

6. Using the information from questions #5. Suppose you wanted to buy some of this isotope, and it required half an hour for it to reach you. How much should you order if you need to use 0.10 g of this material?

102.4

2. How many joules are required to heat 250 grams of liquid water from 0 degrees C to 100 degrees C? 114500 J 104500 J 104550 J 104555 J

104500 J

3. How many joules are required to heat a frozen can of juice (use info for water) (360 grams) from -5 degrees C ( the temperature of an over cooled refrigerator) to 110 degrees C (the highest practical temperature withing a microwave oven)? 1095299 J 1095282 J 1095568 J 1096000 J

1095282 J

5. How many joules does it take to melt 35 g of ice at 0 degrees C? 11698 J 11699 J 11690 J 12690 J

11690 J

1. You decide you want to carry a boulder home from the beach. It is 30 centimeters on each side, and so has a volume of 27,000 cm3. It is made of granite, which has a typical density of 2.8 g/cm3. How much will this boulder weigh in pounds? 166.5 lbs 76000 g 167.3 lbs 75600 g

166.5 lbs

2. How much heat is needed to raise the temperature of a block of copper ( weighing 0.5 kg) from 0°C to 100° C ? (for copper, c = 386 J / kg oC) 18999 J 19300 J 19350 J 19288 J

19300 J

1. Write the e- configuration for C.

1s22s22p2

7. Write the e- configuration for Fe.

1s22s22p63s23p64s23d6

4. In the above two examples (questions 2 and 3) which rock is more dense? 1st rock 4th rock 2nd rock 3rd rock

1st rock

3. You have a different rock with a volume of 30cm3 and a mass of 60g. What is its density? 3.0 g/cm3 2.0 g/cm3 2.78 g/cm3 1.5 g/cm3

2.0 g/cm3

15. What is the difference in electronegativity in KCl? Do not round.

2.34

13. What is the oxidation number for group II elements?

2/ +2

4. A 65.0 g piece of iron at 525° C is put into 635 grams of water at 15.0° C.What is the final temperature of the water and the iron in degrees Celsius? Cp of iron = 0.451 J/g·K Cp of water = 4.18 J/g·K 298.2 K 21.03 C 20.76 C 20.6 C

20.6 C

3. How much heat is needed to raise the temperature of 0.5 kg of water from 0°C to 100° C? (for water, c = 4186 J / kg oC) 21000 J 209300 J 210900 J 220000 J

209300 J

8. The temperature of a sample of water increases from 20°C to 46.6°C as it absorbs 5650 calories of heat. What is the mass of the sample? (Specific heat of water is 1.0 cal/g °C) 212.006 g 212.41 g 215.25 g 214.02 g

212.41 g

11. Actinium-226 has a half-life of 29 hours. If 100 mg of actinium-226 disintegrates over a period of 58 hours, how many mg of actinium-226 will remain?

25

Cpice = 2.05 J/g x C Cpwater = 4.18 J/g x C Cpgas = 2.02 J/g x C Hfus = 334 J/g Hvap = 2260 J/g 1. How many joules are required to heat 75 grams of water from -85 C to 185 C? Round to nearest hundredth. 251846.25 J 367746.75 J 254567.45 J 252013.68 J

251846.25 J

6. Find the final temperature when 10.0 grams of aluminum at 130.0 °C mixes with 200.0 grams of water at 25 °C. Assume no water is lost as water vapor. This solution uses the specific heat of 0.901 for aluminum and the Cp of 4.18 for water. 26.12 °C 27.12 °C 26.189 °C 26.20 °C

26.12 °C

8. Convert 303 mi/hr to feet/min. 26659 ft/min 26657.0 ft/min 26658.3 ft/min 266666.7 ft/min

26658.3 ft/min

13. A solid cylinder has a radius of 2 cm and a length of 7 cm. It has a density of 3.1 g/cm3. What is the mass of the cylinder? 273.4 g 272.7 g 273.56 g 274.5 g

272.7 g

2. How many orbitals are in the p sublevel?

3

2. You have a rock with a volume of 15cm3 and a mass of 45 g. What is its density? 3.5 g/cm3 2.55 g/cm3 4.0 g/cm3 3.0 g/cm3

3.0 g/cm3

10. What is the mass of a cylinder of lead that is 2.50 cm in diameter, and 5.50 cm long. The density of lead is 11.4 g/mL and the volume of a cylinder is . V= pie r(squared) height 306.6 g 308.8 g 307.7 g 307.686 g

307.7 g

1. Change a speed of 72.4 miles per hour to its equivalent in meters per second. 32.7 32.9 32.4 32.7

32.4

The formation of gas bubbles is often the result of a chemical change. Which would not be a chemical change? fermentation burning mixing vinegar with baking soda boiling water

boiling

17. Which of the following is not correct? Put the letter of the alphabet as your answer. a. ZnSO4 b. KMnO4 c. NA2HCO3 d. LiBr

c.

11. Name of CO32-. bisulfate permanganate ammonium carbonate

carbonate

19. Which have a smaller radius than their neutral atom, a cation or anion?

cation

A physical change only changes the appearance of a substance, not its ___________________ composition.

chemical

Chemical changes are also known as ______________________ reactions.

chemical

Flammability is an example of a _____________________ property.

chemical

The definition of a _______________ property is that measuring that property must lead to a change in the substances chemical structure.

chemical

Which does not belong? intensive physical extensive chemical

chemical

What are the two types of change in matter? __________________ and _________________

chemical and physical

15. Name of ClO3- nitrite chlorite peroxide chlorate

chlorate

Which of the following is a physical property? color change color give off heat heat of combustion

color

8. A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0 cm3. Given the following densities, identify the metal. Gold: 19.3 g/mL Copper: 8.86 g/mL Bronze: 9.87 g/mL bronze copper none of these gold

copper

19. What is the name of CN-?

cyanide ion/ cyanide

5. Which element has the highest ionization energy? a. O b. C c. Be d. Ne

d.

7. How many joules are required to melt 100 grams of water? 33400 J 33546 J 33405 J 34300 J

33400 J

9. How many joules are required to boil 150 grams of water? 339090 J 339021 J 338990 J 339000 J

339000 J

7. Convert 4.09 x 10-6 kg/L to mg/cm3 using dimensional analysis. 4.0111 x 10-3 4.2 x 10-4 5.2 x 10-4 4.1 x 10-3

4.1 x 10-3

Round to the nearest whole number. Don't forget to convert kJ to J. 10. A pot of water is heated by transferring 1676 kJ of heat energy to the water. If there is 5.00 kg of water in the pot, and the temperature is raised by 80.0 K, what is the specific heat of water? 41.90 J/kg∙K 4200 J/kg∙K 4.190 J/kg∙K 4190 J/kg∙K

4190 J/kg∙K

2. Convert 45.3 cm to its equivalent measurement in mm. 435.0 452.0 453.0 453.0

453.0

17. How many electrons would be in the f orbital for the electron configuration of Sm?

5

6. What is the density of the nugget in question #5? 5.0 g/cm3 7.0 g/cm3 4.55 g/cm3 6.0 g/cm3

5.0 g/cm3

24. You are given a sample that contains 70 percent lithium-5 and 30 percent lithium-8, what is the atomic mass of the element? 6.10 5.956 5.90 5.87

5.90

8. How many joules are required to heat 200 grams of water from 25 degrees C to 125 degrees C? 524980 J 525080 J 524800 J 524899 J

524800 J

12. The half-life of isotope X is 2.0 years. How many years would it take for a 4.0 mg sample of isotope X to decay and have only 0.50 mg of it remain?

6

14. So, you know that the atomic masses of these two copper isotopes are 62.93 u and 64.93 u, respectively. Their decimal abundances will be 0.692 and 0.308, respectively. The average atomic mass of copper will thus be 63.678 63.549 63.546 63.589

63.546

9. The specific heat of gold is 129 J/kg∙K. What is the quantity of heat energy required to raise the temperature of 100 g of gold by 50.0 K? 654 J 649 J 645 KJ 645 J

645 J

12. Gasoline is a non-polar liquid that will float on water. 450 grams of gasoline is spilled into a puddle of water. If the density of gasoline is 0.665 g/mL, what volume of gasoline is spilled? 680.0 ml 767.6 ml 676.7 ml 679.6 ml

676.7 ml

12. How many orbitals are in sublevel f?

7

4. The diameter of a red blood cell is about 3 x 10-4 inches. What is the diameter in centimeters? 7.6 x 10-5 cm 7.6 x 10-4 cm 7.6 x 10-3 cm 7,65 x 10-3 cm

7.6 x 10-4 cm

9. How many significant digits are in .023454320? 7 10 8 9

8

2. Polonium-214 has a relatively short half-life of 164 seconds. How many seconds would it take for 8.0 g of this isotope to decay to 0.25 g?

820 seconds

5. Using "2p4", what does the p represent?

sublevel

28. Name of SO3-2. sulfate persulfate thiosulfate sulfite

sulfite

1. What is the name of this formula? SO3

sulfur trioxide

Name S2O32- sulfate persulfate thiosulfate sulfite

thiosulfate

An intensive property does not depend on the amount of substance present. True False

true

Chemical changes cause a substance to change into an entirely new substance. True False

true

Chemical properties cannot be determined just by viewing of touching the substance. True False

true

The best way to be completely certain whether a change is physical of chemical is to perform chemical analyses. True False

true

20. The group number indicates the number of number of neutrons valence electrons the family name electrons

valence electrons

22. Anhydrous means ________________ _____________.

without water