Chemistry Test 1

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How to name of ionic compound?

cation named first, anion named second

What is mass #?

# of protons and # of neutrons

What charge is Aluminum always?

+3

What charge do halogens have mostly?

-1

What charge do period 6A mostly have?

-2

What number of moles is equivalent to 7.03 ✕ 1021 atoms of Hg?

.0117 mol Hg

The density of chromium at 25°C is approximately 7.15 g/cm3. Express this value in lb/in3. (Note that 1 lb = 453.59237 g exactly, and 1 in = 2.54 cm exactly.)

.258 lb/in^3

The diameter of a biscuit is approximately 51 millimeters (mm). An atom of bismuth (Bi) is approximately 320. picometers (pm) in diameter. Calculate the number of bismuth atoms needed to span the diameter of a biscuit in a line. Express your answer in scientific notation, showing the correct number of significant figures. #23

1.6e+08 Bi atoms

What is the mass, in grams, of 5.64 moles of oxygen gas (O2)?

180 g

Calculate the formula mass of bromoform, CHBr3.

252.7 amu

How many moles of CO2 contain 3.01 ✕ 1024 molecules?

5.00 mol CO,2

What is the mass of 1.21 mol calcium oxide (CaO)?

67.9 g

How many molecules of fructose (C6H12O6) are present in 27.7 g of the substance?

9.26e+22 molecules

A compound has an empirical formula of CH2O and a molar mass of 150. g/mol. What is the molecular formula?

C,5H,10O,5

Oxalic acid, which is present in rhubarb, was found to consist of 26.68% C, 2.24% H, and 71.08% O by mass. Find the empirical formula for oxalic acid.

CHO,2

Ethylene dichloride, which is present in paint removers, was found to consist of 24.27% C, 4.07% H, and 71.65% Cl by mass. Find the empirical formula of ethylene dichloride.

CH_2Cl

What is a molecular compound?

a compound that begins with a nonmetal

CH,3COOH

acetic acid

Group 1A is known as ?

alkali metlas

Group 2A is known as?

alkaline earth metals

What is an element that can exist in several different and distinct forms each having its own?

allotropes, Carbon is an ex

What is the only polyatomic ion with a +1 charge?

ammonium

What is unit of formula mass?

amu

What is the compound w/o water?

anhydrous

C,6H,6

benzene

C,4H,10

butane

What is an ionic compound?

compound that beings with a metal

C,2H,6

ethane

CH,3CH,2OH

ethanol

What is the unit of mass?

grams

Group 7A is known as ?

halogens

What is substance composed of an inorganic salt and physiclally bound water?

hydrate

Which elements exist as diatomic/triatomic?

hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine

What type of compounds consist of ions, atoms, or groups of atoms?

ionic compound

CH,4

methane

CH,3OH

methanol

What type of compounds consist of discrete molecules at the particulate level?

molecular compounds

How do you name negative ions?

monatomic anion: add -ide ending to stem name ex. Fluoride

How do you name positive ions?

name of metal plus word ion

Group 8A is known as ?

noble gases

What is the prefix for 9?

nona

What is atomic mass?

number on periodic table for mass

C,5H,12

pentane

What are the two polyatomic ions with a -3 charge?

phosphate, phosphite

C,3H,8

propane

What are monatomic ions?

single atoms that lost or gained electrons

What is the empirical formula?

smallest whole # ration of atoms present

What are the eight polyatomic ions with -2 charge?

sulfite, sulfate, carbonate, hydrogen phosphate, chromate, oxalate, silicate, dichromate

What is the prefix for 4?

tetra

What is the molecular formula?

the actual numbers of atoms present in a molecule

What does diatomic mean?

two atoms

Normal blood glucose concentrations range between 75 and 125 mg/dL. Blood glucose concentrations that drop below 40 mg/dL are considered life threatening. If a person's blood is tested and found to contain 2743 µg/mL glucose, should that person receive immediate medical attention? (1 L = 1 × 101 dL) #20

yes, it's way above normal range


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