CHM 110 TEST 1 CHS 1-2 NAME_______________________

Write your answers to the following questions. If a calculation is involved, use the correct number of significant figures in your answer. A periodic chart and table of conversions is give. Do not consult your text covers. All questions are 10 points each. 1-10 must be attempted before starting 11.

1. Zinc is a silver-gray colored metal, which melts at 420^oC. When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves. Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13g/cm³ at 25^oC. It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide. The specific heat of zinc is 0.0096 cal/(C-g) and the specific volume of zinc at 25^oC is 0.140 cm³/g. The atomic weight of zinc is 65.38. Label each of these properties as

a) physical

color, mp, hardness, density, specific heat, specific volume, atomic weight

b) chemical

reacts with sulfuric acid, reacts with oxygen

c) intensive

color, mp, hardness, density, atomic weight

reacts with sulfuric acid, reacts with oxygen

d) extensive.

, specific heat, specific volume

Some may be more than one of these types.

1. What are the empirical formulas of the following compounds?

a) P₄N₄

b) N₂0₄

c) C₆H₁₂O₆

d) B₂H₆

e) N₂

1. Use the following substances to answer the questions below.. Air, Sodium Chloride, beef stew, Titanium, black coffee, Sulfur, water.

a) Classify each of the following as an element, compound, or mixture. Air, Sodium Chloride, beef stew, Titanium, black coffee, Sulfur, water.

b) Classify the elements as a metal or non-metal. Air, Sodium Chloride, beef stew, Titanium, black coffee, Sulfur, water.

c) Classify the compounds as ionic or molecular. Air, Sodium Chloride, beef stew, Titanium, black coffee, Sulfur, water.

3 (continued)

d) Classify the mixtures as homogeneous or heterogeneous. Air, Sodium Chloride, beef stew, Titanium, black coffee, Sulfur, water.

e) List 2 methods used to separate mixtures.

1. Some elements form molecular compounds of themselves. What are elements of this type called? List them by their molecular formulas.

2. What are the properties of a solid, liquid and gas? Give an example of a solid, liquid and gas.

3. a) At what temperature are the temperature units of C and F equal?

F = (9/5)*C + 32

T = (9/5)*T + 32

T*(1-9/5) = 32

T*(-4/5) = 32

T = 32*(-5/4)

T = -40F = -40C

b) Another unit of temperature is the Rankin, R. At what temperature are the units of R and K equal?. 0 F = 459.67 R

R = F + 459.67

0 K = -459.67 F

F = K –459.67

R = (K – 459.67) +459.67

R = K for all R and K…wrong

R = F + 459.67

F = (9/5)*C + 32

R = (9/5)*C + 32 + 459.67

C = K –273.15

R = (9/5)*( K –273.15) + 32 + 459.67

R = (9/5)*( K –273.15) + 491.67

R = (9/5)*K –491.67 + 491.67

R = (9/5)*K è ONLY 0 R = 0 K

4. a) Complete the table below. Assume all atoms are neutral.

SYMBOL	Pt	P	I
PROTONS	78	15	53
NEUTRONS	117	16	68
ELECTRONS	78	15	53
ATOMIC NO.	78	15	53
MASS NO.	195	31	121

b) List the three types of radiation, which were deflected differently through electrically charged plates.

c) What is the composition of these three particles?

1. A 3.25 in diameter ingot of silicon is to be formed from 275.0 lbs. of molten Si at 1410 ^oC.

a) What is the melting point of Si in ^oK and ^oF?

K = C + 273.15

1683.15

K è 1683 K

F = (9/5)*C + 32

2570

F

a) How long will the ingot be in feet if the density of Si is 2.330 g/mL? [Volume of a cylinder = p*(D/2)²*L].

Density = mass/volume

Volume = mass/density

Mass/density = p*(D/2)²*L

L = Mass/(density*p*(D/2)²)

L = 28.721 ft è 28.7 ft

b) Estimate the atomic radius of Si in Angstroms and nanometers if 6.0221421 X 10 ²³ atoms of Si have a mass of 28.0855 g. [Assume each atom to be a sphere: Volume of a sphere = (4/3)*p*R³]

Volume of a sphere = (4/3)*p*R³

R³ = Volume of a sphere /[(4/3)*p*]

Volume of atom = mass/(atom*density)

R³ = mass/(atom*density) /[(4/3)*p*]

R = ( mass/((atom*density) [(4/3)*p*]))^1/3

R =	2.715E-08	cm
	2.715	A
	0.2715	nm

1. State the name or write the formula for the following compounds.

a) Ferrous Sulfate

b) Sn₃(PO₄)₂

c) (NH₄)₂Se

d) Vanadium (V) Sulfide

e) Calcium Bicarbonate

1. . Draw a picture of the periodic table. Label the main group element columns, alkali, alkali-earth metals, halogens, noble gases, and location of metals and non-metals.

2. . Forgetful Freddie places 25.0 mL of a liquid in a graduated cylinder with a mass of 89.450 g when empty. When Freddie placed the metal slug into the cylinder, the volume rose to 30.7 mL. Freddie was asked to calculate the density of the liquid and of the metal slug from his data, but he forgot to obtain the mass of the liquid. He found the mass of the graduated cylinder containing the liquid and the slug to be 125.934 g. Find the density of the metal slug in g/mL. Density of liquid is 0.0200 g/mL

Mass cylinder = 89.450 g

Mass cylinder + mass liquid + mass slug = 125.934 g

mass liquid = density liquid * volume of liquid.

mass liquid = 0.0200g/mL * 25.0 mL = 0.500 g.

Mass cylinder + mass liquid = 89.450g + 0.500g = 89.950g

Mass cylinder + mass liquid + mass slug = 125.934 g

- Mass cylinder + mass liquid = 89.450g + 0.500g = 89.950g

==============================================

mass slug = 35.984 g

Volume liquid +volume slug = 30.7 mL

-Volume liquid = 25.0 mL

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volume slug = 5.7 mL

Density = mass/volume = 35.984g/5.7mL = 6.313 g/mL è 6.3 g/mL