CHEM 107 Final Review and Exam Preparation - Nair - Texas A&M University Galveston

Measurements consists of two parts

number and unit

Accuracy

how close a measurement is to the true value

Precision

The degree to which repeated measurements show the same result.

SI unit of length

meter (m)

SI unit of volume

cubic meter (m^3)

SI unit of mass

kilogram (kg)

SI unit of temperature

kelvin (K)

SI unit of time

second (s)

prefixes deci (d)

10^-1

prefixes centi (c)

10^-2

prefixes milli (m)

10^-3

prefixes micro (mu)

10^-6

prefixes nano (n)

10^-9

prefixes pico (p)

10^-12

prefixes giga (G)

10^9

prefixes mega (M)

10^6

prefixes kilo (k)

10^3

density equation

density = mass/volume

what is waters density?

1 g/mL

If the caffeine concentration in a particular brand of soda is 3.81 mg/oz, drinking how many cans of soda would be lethal? Assume that 10.0 g of caffeine is a lethal dose, and there are 12 oz in a can.

cans of soda: 219

convert 14.6 mg to g

0.0146 g

convert 2.59 dg to g

0.259 g

convert 0.0389 micrograms to g

3.89 x 10^-8

convert 2.84 cm^3 to gallons

7.50 x 10^-4

boiling point of water in F

212 F

boiling point of water in C

100 C

boiling point of water in K

373 K

Convert 219.1 F to C

103.9 C

what does an atomic symbol have on it?

top small number is mass number, middle letter is element symbol, bottom small number is atomic number

How many protons, neutrons, and electrons are there in a neutral atom of ^131 I (iodine-131)?

protons: 53

electrons: 53

neutrons: 78

Give the nuclear symbol for the isotope of gallium, Ga, that contains 40 neutrons per atom

(71/31)Ga

What is the average atomic mass of titanium?

Isotope Abundance Mass(u)

46Ti 72.200% 45.95263

48Ti 10.200% 47.94795

50Ti 17.600% 49.94479

average atomic mass: 46.850

35Cl has a mass of 34.9689 u

37Cl has a mass of 36.9659 u

Determine the abundance of each isotope.

35Cl abundance: 76

37Cl abundance: 24

Naturally occurring gallium consists of two isotopes. One of those isotopes is 71Ga with an isotopic mass of 70.9247050 amu and an abundance of 39.892%. What is the mass number of the other isotope?

mass number: 69

How many protons are in an ion with 18 electrons and a -1 charge?

and

How many total electrons are in a Fe^2+ ion?

number of protons: 17

number of electrons: 24

What is the charge on a hypothetical ion with 45 protons and 43 electrons?

+2

A Se ion has a mass number of 78 and a charge of −2. Determine the number of neutrons, protons, and electrons in this ion.

number of neutrons: 44

number of protons: 34

number of electrons: 36

name this compound and find the charge of both elements:

Li2O

Lithium Oxide

Li charge: +1

O charge: -2

name this compound and find the charge of both elements:

CaS

Calcium Sulfide

Ca charge: +2

S charge: -2

name this compound and find the charge of both elements:

Mg3N2

magnesium nitride

Mg charge: +2

N charge: -3

name this compound and find the charge of both elements:

Al2S3

Aluminum Sulfide

Al charge: +3

S charge: -2

identify the solvent and the solute:

A solution containing 10.0 g LiCl and 100.0 g of water

solvent: water

solute: LiCl

identify the solvent and the solute:

A solution containing 40.0 mL of propanol and 25.0 mL of water

solvent: propanol

solute: water

identify the solvent and the solute:

A solution containing 7.5 g AgNO3 and 15 mL of water

solvent: water

solute: AgNO3

For the chemical reaction

HClO4(aq)+NaOH(aq)⟶H2O(l)+NaClO4(aq)

write the net ionic equation, including the phases.

which ions are considered spectator ions?

H^+ (aq) +OH^-