chem 11

What is the mass in grams of 3.2 × 1022 molecules of water?

.96g

how many significant figures in 1000

1

Which of the following pairs of reactants, when they react, will result in a redox reaction? 1) Mg(s) + O2(g) 2) HCl(aq) + NaOH(aq) 3) Na(s) + Cl2(g)

1 and 3

When the equation below is balanced, what should the coefficients be? C5H12 + O2 → CO2 + H2O

1,8,5,6

How many lone pairs of electrons are in the Lewis structure of PF3?

10

Report the following sum to the correct number of significant figures: 1.008 g + 126.90 g = _______

127.91 g

How many He-4 nuclei would be needed to form a Fe-56 nucleus?

13 (The atomic number of Fe is 26 and that of Helium is 2

What is the electron configuration for the period 4 group 7A (also called Group 17) element?

1s2 2s2 2p6 3s2 3p6 4s2 3d104p5

For the element nitrogen, write the electron configuration and indicate which electrons will be gained or lost to form an ion.

1s^22s^2p^3, three 2p electrons gained

Which of the following combinations will result in a precipitation reaction. 1) Cr(NO3)3(aq) + KCl(aq) → 2) CuCl2(aq) + Na2S(aq) → 3) NH4Br(aq) + Na2SO4(aq) →

2 only

How many valence electrons are in PF3?

26

What is the most likely value of x in the molecule CHClx?

3

how many dots are in the electron dot symbol for B

3

Which of the following reactions is an acid-base (neutralization) reaction? 1) AgNO3(aq) + NaBr(aq) → AgBr(s) + NaNO3(aq) 2) Na(s) + Br2(l) → 2 NaBr(s) 3) H2SO4(aq) + 2 KOH(aq) → 2 H2O(l) + K2SO4(aq)

3 only

How many moles of NH3 can be produced from 5.00 moles of H2 according to the following equation? N2 + 3 H2 → 2 NH3

3.33 mol

what is the mass in grams of 3.60x10^14 iron atoms each having a mass of 56 amu?

3.35x10^-8 g

Water has a specific heat of 4.184 J/g°C. How many kJ of energy are required to raise the temperature of 0.453 kg of water from 21.0 °C to 37.0 °C?

30.3kj

Give the number of protons, neutrons and electrons in Ge-74

32,42,32

Mercury has a density of 13.6 g/mL. How many milliliters of mercury have a mass of 475 g?

34.9

How many sig figs does 0.1000 have?

4

The number of significant figures in the measured quantity 0.02040 g is _______.

4

How many charge clouds are around the sulfur atom in H2S and what is the shape of the H2S molecule?

4 charge clouds, bent

The measured quantity 0.00410 g written in scientific notation is _______.

4.10x10^-3

Copper has a density of 8.96 g/cm3. If 75.0 g of copper is added to 50.0 mL of water in a graduated cylinder, to what volume reading will the water level in the cylinder rise?

58.4 mL

How many atoms are in 23 g of sodium each of mass 23 amu?

6.02x10^23 atoms

An atom contains 6 protons and has A = 14. Give the number of electrons and neutrons in the atom, and identify the element.

6e, 8n, carbon

746 nm is equivalent to how many meters?

7.46x10^-7

On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69Ga and 39.71% for 71Ga. What is the atomic mass of gallium for this location? The mass of 69Ga is 68.7200amu . The mass of 71Ga is 70.9200amu .

70.28 amu

How many atoms of hydrogen are in one molecule of isopropyl alcohol, (CH3)2CHOH?

8

How many dots are in the electron-dot symbol for the oxide ion, O2-?

8q

How can the following equation best be interpreted? N2 + 3 H2 → 2 NH3 A) 1 mole N2 completely reacts with 3 moles of H2. B) 2 moles N produces 2 moles of NH3. C) 2 moles H produces 2 mole NH3. D) A and c are correct.

A

Which of the following molecules is NOT likely to exist? A) BCl2 B) CH2Cl2 C) NH2Cl D) H2Se

A

Aluminum atoms lose three electrons when they react. Write the symbol for the ion that forms and tell whether it is an anion or a cation.

Al^3+

2 Al(s) + 3 Cl2(g) → 2 AlCl3(s) + 337 kcal When 1.00 mol of AlCl3 forms in this reaction, _______. A)169 kcal of heat are absorbed B)169 kcal of heat are released C)337 kcal of heat are absorbed D)337 kcal of heat are released

B

The element having chemical properties most similar to As is _______. A) S B) Sb C) Se D) Si

B

Which of the following contains 6.022 × 1023 (Avogadro's number) atoms of hydrogen? A) 2.0 g H B) 9.0 g H2O C) 17.0 g NH3 D) 24.0 g CH4

B

Which of the following is a chemical change? A) solid potassium chloride is dissolved in water B) copper metal oxidizes to form Copper (II) oxide C) Carbon dioxide sublimes by going from a solid to a gas D) Liquid ammonium evaporates

B

When potassium is added to water contained in a beaker, the reaction shown below occurs, and the beaker feels hot to the touch. K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) The reaction is _______. A) endothermic and ΔH is negative B) endothermic and ΔH is positive C) exothermic and ΔH is negative D) exothermic and ΔH is positive

C

Which is not a physical property? A) The smell of alcohol B) The luster of gold jewelry C) Frying an egg D) The melting point of butter

C

Which is the correct formula for Lithium phosphide? A) Li3PO4 B) Li3PO3 C) Li3P D) Li2PO2

C

Which of the following processes results in an increase in entropy of the system? A)A liquid freezing B)Organizing a deck of cards into four suits C)Sugar dissolving in water D)A gas condensing

C

Which of the following will slow down the rate of a reaction? A)Temperature is increased. B)Adding a catalyst and maintaining the temperature. C)Temperature is decreased. D)More reactant is added to the system.

C

Which one of the following statements describes an oxidizing agent? A) It causes reduction to occur. B) It becomes more positive. C) It undergoes reduction. D) It may gain more oxygen atoms.

C

In the molecule formaldehyde, CH2O, a double bond is found between _______.

C and O

Of the bonds C-C, C-N, C-O, and C-F, which is the most polar bond?

C-F

Identify the oxidizing agent and the reducing agent in the following reaction. Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3 CO2(g)

CO is the reducing agent, Fe2O3 is the oxidizing agent

The name of the compound Cr2(SO4)3 is ____.

Chromium (III) Sulfate

Which of the following best describes the way ionic bonds are formed? A) Both metals and nonmetals lose electrons to form bonds. B) Both metals and nonmetals gain electrons to form bonds. C) Metals gain electrons and nonmetals lose electrons to form bonds. D) Metals lose electrons and nonmetals gain electrons to form bonds.

D

Which of the following is NOT true of molecular compounds? A) Their smallest components are molecules. B) They are composed of all nonmetals. C) They possess high melting points. D) They are usually soluble in organic liquids.

D

Which of these is a pure substance: sodium metal, solid sodium chloride, sodium chloride dissolved in water? A) All are pure substances. B) None are pure substances. C) Only sodium metal is a pure substance. D) Only sodium metal and solid sodium chloride are pure substances.

D

Of the compounds HNO2, Ba(OH)2, and HF, which are acids? A) All are acids. B) None is an acid. C) Only Ba(OH)2 is an acid. D) Only HNO2 and HF are acids.

D, a non metal having hydrogen is generally acid, a metal having hydrogen is generally base if a carbon compound has hydrogen adjacent to oxygen then it becomes acidic

Put the following elements in order of decreasing electron affinity. N, Li, F, C

F,N, C, Li

Of the elements listed below, which one can form more than one cation? Na, Mg, S, Fe

Fe

Hydrogen has three isotopes: H-1, H-2, and H-3, and an average atomic mass of 1.00794 amu. Which isotope is most abundant?

H-1

Classify the following elements as halogens, alkali metals, alkaline earth metals, or noble gases. Br, Li, K, Ne, Mg, I

Halogens (group 7): Br, I Alkali metals: Li, K Alkaline earth metals: Mg Noble gases (group 8): Ne

Put the following elements in order of increasing ionization energy. N, Li, F, C

Li, C, N, F

Name one element that is likely to be chemically similar to Calcium

Magnesium

Classify the following elements as metal, non metal or semimetal Kr, Na, Mn, O, Si, As

Metal: Na, Mn Non metal: O, Kr Semi metal: As, Si

Using only the periodic table, determine which element below loses an electron most easily? A) Br B) Mg C) Na D) S

Na

Elements belonging to group 2A (also called Group 2) on the periodic table below are known as the _______.

alkaline earth metals

what type of bond is 0-0.4

covalent

The name of N2O4 is _______.

dinitrogen tetroxide

Bond formation is _______.

exothermic and releases energy

Butane has a melting point of -138.4 °C and a boiling point of -0.5 °C. What is the state of butane at room temperature, which is 25 °C?

gas

what type of bond has a difference in electronegativity greater than 1.7

ionic

What is the molecular geometry around the carbon atom in carbon disulfide, CS2?

linear

Sort by main group metals, transition metals and inner transition metals: Pb, O, Fe, Ca, U, Ag

main group: Pb, Ca, O transition metals: Fe, Ag inner transition metals: U (elements in group one and two are metallic but are main group elements

What additional particles would be needed?

neutrons

Of HCl, Cl2, and CsCl, which is (are) polar covalent?

only HCl

what type of bond is 0.5-1.7

polar covalent

What is the molecular geometry around the central atom in NH3 and BCl3, respectively?

pyramidial, planar traingular

What is the solubility in water of Na3PO4 and PbI2, respectively?

soluble, insoluble

The polyatomic ion SO32- is named _________.

sulfite

Where in the periodic table are the best reducing agents found?

upper left hand corner