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chemistry

what is the correct value for Avogradro's number?

6.022E23

One mole of Boron has a mass of _____ g

10.811

What is the mass in grams of 5.40 moles of Lithium

37.8g

Calculate the molar mass of calcium nitrate

164.1

Determine the emperical formula of a compoound containing 60.3% magnesium and 39.7% oxygen

MgO

What is the mass percent of carbon in oxalic acid, H2C2O4

26.7

which ingredient is the limiting reactant if you have 5 cups of flour, 9 eggs and 3 tbs of oil? Given: 2 cups flour + 3 eggs + 1 tbs oil- 4 waffles

flour

how many grams of water are made from the reaction of 16 grams of oxygen gas? Given: 2H2 + O2- 2H2O

18

How many moles of water are made from the reaction of 1.4 moles of hydrogen gas? Given: 2H2 + O2- 2H2O

1.4

What type of reaction is the generic equation A+BC- AC+B

single displacement

What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide

(H^+) +(OH-) - H2O

A sample of oxygen gas that contains Avogadro's number of atoms has a mass of?

16 g

The molecular weight of a compound X(NO3)3 is 213. the atomic weight of x is? which is

27; Al

Consider the following generic chemical equation: 2A+5B-C+3D. If you react 4 units of A with 10 unites of B, which statement is true

there are equivalent amounts of A and B

What is the percent yield of CuS for the following reaction given that you start with 15.5 g of Na2S and 12.1g CuSO4? The actually amount of CuS produced was 3.05 g. Reaction Na2S+CuSO4- Na2So4+CuS

42.1%

What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2+2Li3PO4- 6LiNO3+ Ca3(PO4)2

Ca(NO3)2

The reaction HNO3(aq) + KOH(aq)- KNO3(aq)+ H2O is best classified as

acid-base neutralization

The reaction Pb(NO3)2(aq)+K2SO4(aq)- PbSO4(s)+2KNO3(aq) is best classified as

precipitation reaction

The reaction Cu(s)+2AgNO3(aq)-Cu(NO3)2(aq)+ 2Ag(s)

oxidation-reduction reaction

Write a balanced net ionic equation for the reaction of Pb(NO3)2(aq) with NaI(aq)

(Pb^2+)aq+ (2I^-)aq-PbI2(s)

Which one the following compounds is soluble in water

Pb(NO3)2

All of the following compounds are soluble in water EXCEPT

PbCl2

Name the aromatic compound

Bromobenzene

Name the following compound CH3-CH2-CH2-CH--(double bond) CH2

1-pentene

What is the main product when 232/90Th undergoes beta decay

232/91 Pa

Which of the following statements about carbon is FALSE

none of the above;

What molarity should the stock solution be if you want to dilute 250 ML to 2L and have the final concentration be .103 M?

8.24 M

The functional groups in the molecule below are H2NCH2CO2H

alkane, amine and carboxylic acid

A compound named +propanal" would be classified as an

Aldehyde

Tritium (3/1 H) is an isotope of hydrogen that is sometimes used to make the hands of watches glow in the dark. The half-life of tritium is 12.3 years. After 49 years, approximately how much of the original tritium remains?

6.25%

What is the missing particle? 231/90 Th=_+231/89 Ac

positron

Given that you wished to use exactly .325 mole of NaCl to prepare a 2.5 M NaCl solution, how many milliliters of solution must you prepare?

130 mL

Suppose a Vodka martini contains 30% alcohol with the remaining portion of the drink composed of water. what is the solute in this type of martini?

alcohol

What is the mass percent of an ammonium carbonate solution prepared by dissolving 33.2 grams of solid into 39.5 grams of water?

45.7%

What is the main product when 235/92 U undergoes alpha decay

231/90 Th

Nuclear fusion:

all of the above

the self-amplifying reaction in which neutrons produced by the fission of one nucleus would induce fission in other nuclei is called

chain reaction

which of the following is the formula for heptane

C7H16

which type of hydrocarbon is classified as being saturated

alkanes

what volume of 12 M HCl is required to make 75 mL of 3.5 M HCl?

21.9 mL

A Geiger-Muller counter detects radioactivitiy by:

ionization of argon gas in a chamber which produces an electrical signal

Which of the following functional groups represents an alcohol?

-OH

Which of these compounds would you expect to be least soluble in water

N2

what is the molarity of a solution prepared by dissolving 54.3 g of Ca(NO3)2 into 355 mL of water?

.932 M

A .15 M solution of BaCl2 contains:

.15M (Ba^2+) ions and .30 M (Cl-) ions

Which of the following functional represents a ketone?

O
||
R- C - R

What is the missing particle? 231/90 Th- _+231/91 Pa

beta particle

A consistent framework for organizing scientific knowledge is a

theory

which of the following is a heterogeneous mixture

root beer float

which of the following is a homogeneous mixture

chicken broth

which of the following processes does not represent a chemical change

dissolving sugar in water

which of the following processes does not represent a physical change

fermenting grape juice

which of the following does not represent a physical property

flammability

one mole of potassium sulfate contains:

4 moles of oxygen

how many atoms are in 15.6 grams of silicon

3.34E23

how many moles of bromine gas are in 37.7 grams

.24 mol

which of the following is not an example of matter

light

which of the following is a compound

water

which state of matter has atomic spacing that is close together and indefinite shape

liquid

which state of matter has indefinite shape and is compressible

gas

which state of matter has atomic spacing that is close together and definite shape

solid

a pure substance is

composed of only one type of atom or molecule

.00504 in scientific notation

5.04E-3

which of the following is the smallest distance

1 nm

for the following measured numbers the significant figures is indicated in parenthesis. which is correct

0.0130 (three)

the number of significant figures in 2.08E-4 cm is

3

An experiment calls for 22.6 g of bromine. (d=3.12 g/mL). what volume, in mL, should be used?

7.24

Express the following result to the proper number of significant figures. 45.36M/3.2S

14

Perform the indicated operations and give the answer in cm with the proper number of significant figures, 12.64 cm -48 mm +.246 m=

32.4

which of the following is a part of Dalton's atomic theory

atoms are rearranged but not changed during a chemical reaction

which of the following is not explained by Dalton's atomic theory

the existence of more than one isotope of an element

the existence of electrons in atoms of all elements was demonstrated by

thomson's cathode ray tube experiment

which subatomic particle has the smallest mass

an electron

which of the following two atoms are isotopes

12/6 C and 13/6 C

how many protons and neutrons are in an atom of 90/38 Sr

38 p. 52 n

the horizontal rows of the periodic table are called

periods

the vertical columns of the periodic table are called

groups

Lithium belongs to the ____ group of the periodic table

alkali earth

Bromine belongs to the ____ group of the periodic table

halogen

Argon belongs to the ____ group of the periodic table

noble gas

what is the charge on the Cr in the ionic compound Cr2O3

3+

Which of the species below has 28 protons and 26 electrons

(Ni2+)

the chemical formula for the sulfite ion is

(SO3)^2-

the chemical formula for sulfurous acid is

H2SO3(aq)

what is the formula for an ionic compound made of magnesium and sulfur

MgS

what is the name of CoS

Cobalt (2) sulfide

What is the name of the compound made from lithium and oxygen

lithium oxide

what is the formula for an ionic compound of aluminum and oxygen

Al2O3

what is a chemical reaction

when one or more new compounds are formed by rearranging atoms

given the following generic chemical reaction, which is the product
X-Y

Y is the product

What are the coefficients for the following reaction when it is properly balanced?
_ potassium iodide + __ lead (2) acetate- __ lead (2) iodide + __ potassium acetate

2,1,1,2

which of the following represents wavelength

upside down y

which of the following represents frequency

v

the distance between adjacent wave crests is called

wavelength

what happens to an atom when it absorbs energy

the atom re-emits the energy as light

which of the following elements has the highest ionization energy

Ne

which of the following atoms is the largest

Cs

the elements with the highest electronegativity values tend to be found in the

upper right-side of the periodic table

which molecule listed below has a nonpolar covalent bond

H2

what is the molecular geometry of (NH4)+

tetrahedral

the electron geometry and the molecular geometry of water are respectively

tetrahedral, bent

which term matches the definition: A separation of charge within a bond

dipole movement

which molecule listed below has a polar covalent bond

H2O

all of the following statements are consistent with the kinetic molecular theory of gases EXCEPT

strong attractive forces hold the gas molecules together

what is the equivalent pressure of .905 atm in units of mm Hg

688

To solve problems using Boyle's Law, which mathematical equation should be used?

P1V1=P2V2

A balloon filled with .5 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. What is the volume of the balloon at this depth?

.154 L

To solve problems using Charle's Law, which mathematical equation should be used

V1/T1=V2/T2

a 325 mL sample of gas is initially at a pressure of 721 torr and a temperature of 32C. If this gas is compressed to a volume of 286 mL and the pressure increases to 901 torr, what will be the new temperature of the gas?

62.4

what is the initial temperature of a gas if the volume changed from 1 L to 1.1 L and the final temperature was determined to be 255C

207C

the amount of heat required to melt one mole of a solid is called

heat of fusion

which intermolecular forces are found in CO2

dispersion f0rces

How many joules of heat are needed to completely vaporize 24.4 grams of water at its boiling point?

5.5E4

which compound in liquid form will have the highest vapor pressure

CH4

copper is what type of solid

metallic atomic solid

NaCl is which type of solid

ionic solid

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