Quizzes

What is the correct conversion map to convert 16 pounds to grams, with the given conversion factors- 16oz= 1 lb 453.6 g= 16 oz

16 Lb x (16 oz/ 1 lb) x (453.6 g/16 oz)

A redox reaction has occurred ________. A) when a substance reacts with elemental oxygen B) when one substance transfers protons to another C) when one substance forms a solid D) when all of the above occur

A

A structural formula gives more information than a molecular formula. A) True B) False

A

All of the positive charge of an atom is concentrated in the nucleus. A. True B. False

A

An established theory is the pinnacle of scientific understanding. A. True B. False

A

How many grams of water are made from the reaction of 16.0 grams of oxygen gas? Given the reaction: 2H2 + O2→ 2H2O A) 18 B) 9 C) 36 D) 16

A

How many significant figures are in 0.012034050? A. 8 B. 10 C. 5 D. 7

A

Numbers are usually written so that the uncertainty is in the last reported digit. A. True B. False

A

Select the answer that expresses the result of this calculation with the correct number of significant figures. (2.10 cm * 0.5896 cm) + 0.83 cm2 A. 2.07 cm2 B. 2.1 cm2 C. 2 cm2 D. 2.068 cm

A

The compound SO2 is a(n): A) molecular compound B) ionic compound C) both A & B D) neither A nor B

A

The orbital diagram for fluorine shows one unpaired electron in a p orbital A) True B) False

A

The subscripts in a chemical formula do not change for a given compound. A) True B) False

A

When naming compounds, prefixes (mono, di, tri, etc.) are used only for molecular compounds. A) True B) False

A

When viewing a chemical equation, the limiting reactant can never be a chemical on the product side of the equation. A) True B) False

A

Which element is represented by the electron configuration 1s22s22p2? A) C B) He C) Be D) O E) none of the above

A

Write the formula for: copper (II) oxide A) CuO B) Cu2O C) CuO2 D) Cu2O2 E) none of the above

A

Chemical properties of a substance are those that can be observed without changing the composition of a substance. A. True B. False

B

Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion(s) would NOT be present in the net ionic equation? A) Pb2+, NO3- B) K+, NO3- C) K+, Pb2+ D) K+,I-

B

How many joules are there in a 150 calorie snack bar? A. 3.59 ×10^1 B. 6.28 × 10^2 C. 1.07 × 10^3 D. 6.09 ×10^4 E. none of the above

B

In a chemical equation, the products are written to the left of the reaction arrow and the reactants are written to the right of the reaction arrow. A) True B) False

B

In a solid substance, the atoms or molecules rotate about a fixed point. A. True B. False

B

In an endothermic reaction energy is released as a product. A. True B. False

B

Liquids have indefinite volume and definite shape. A. True B. False

B

Name the following compound: PbSO4 A) lead sulfate B) lead (II) sulfate C) lead (II) sulfide D) lead sulfite E) none of the above

B

One mole of argon has more atoms in it than one mole of neon. A) True B) False

B

Select the smallest unit. A. mm B. μm C. km D. m

B

The correct scientific notation for the number 0.0005021 is: A. 5.0210 × 104 B. 5.021 ×10-4 C. 5.021 ×104 D. 5.0210 ×10-4 E. none of the above

B

The following reaction IS balanced: AgNO3 + 2NH4Cl → AgCl + (NH4)2NO3 A) True B) False

B

The properties of elemental calcium (Ca) are very similar to the properties of calcium in calcium bromide (CaBr2). A) True B) False

B

What is the formula for a compound made of magnesium and the polyatomic anion carbonate? A) Mg2CO3 B) MgCO3 C) Mg(CO3)2 D) Mg2(CO3)3 E) none of the above

B

What is the molecular formula of a compound given the molar mass of the compound is 30.04 gram and the empirical formula is NH? A) NH B) N2H2 C) N2H6 D) N4H4

B

Which of the following elements has exactly 30 protons? A. C B. Zn C. Mg D. O E. none of the above

B

A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. What is the volume of the ball? A. 627 cm3 B. 0.207 cm3 C. 4.82 cm3 D. None of the above.

C

Before a chemical equation can be written, one must know: A) the atomic mass of all the elements involved. B) the molar mass of all the compounds. C) the symbols and formulas of all reactants and products. D) the number of moles of all reactants and products. E) none of the above.

C

Calcium fluoride, CaF2, is a source of fluorine and is used to fluoridate drinking water. Calculate its molar mass A) 118.15 g/mol B) 99.15 g/mol C) 78.08 g/mol D) 59.08 g/mol E) 50.01 g/mol

C

How many moles are present in 17.4 g of lead, Pb? A) 0.0994 moles B) 1.05 x 1025 moles C) 0.0840 moles D) 10.06 moles E) 11.9 moles

C

Suppose a thermometer has marks at every one degree increment and the mercury level on the thermometer is exactly between the 25 and 26 degree Celsius marks. We should properly report the temperature measurement as: A. 25°C B. 26°C C. 25.5°C D. 25.50°C E. 25.55°C

C

What is the formula for a compound made of sodium and sulfur? A) NaS B) NaS2 C) Na2S D) Na2S3 E) none of the above

C

What is the long-hand electron configuration for Kr? A) 1s22s22p63s23p43d104s24p6 B) 1s22s22p63s23p64s23d24p6 C) 1s22s22p63s23p64s23d104p6 D) 1s22s22p63s23p24s23d104p6 E) none of the above

C

What type of reaction is the generic equation A + BC → AC + B A) synthesis/combination B) decomposition C) single displacement D) double-displacement

C

Write the formula for: nitric acid A) H3N B) HNO2 C) HNO3 D) HN3 E) none of the above

C

Express 398 K in °C. A. 786 B. 240 C. 263 D. 125 E. None of the above.

D

How many atoms are in 0.534 mol of nickel, Ni? A) 1.13 × 1024 atoms B) 1.48 × 1025 atoms C) 2.44 × 1022 atoms D) 3.22 × 1023 atoms E) 6.98 × 1021 atoms

D

How many total atoms are in the formula Al(NO3)3? A) 3 B) 5 C) 11 D) 13 E) none of the above

D

Name the following compound: S2Cl2 A) sulfur dichloride B) sulfur (II) chloride C) sulfur chloride D) disulfur dichloride E) none of the above

D

One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms? A) 4 B) 2 C) 8 D) 9 E) none of the above

D

What is the correct formula for a compound that has three chlorine atoms and one phosphorus atom? A) Cl3P B) PCl3 C) 3ClP D) PCl3 E) none of the above

D

Which of the following is an empirical formula? A) C2H2 B) C4H6 C) C3H6 D) C3H5 E) All of the above

D

Which one of the following elements exists in nature as a diatomic molecule? A) neon B) sulfur C) boron D) bromine E) none of the above

D

Which of the following atoms is the largest? A) Li B) Na C) K D) Rb E) Cs

E

Which of the following elements has the highest ionization energy? A) Ba B) Ca C) Al D) Cl E) Ne

E

Which of the following is NOT evidence that a chemical reaction has occurred? A) color change B) solid formation C) gas formation D) emission of light E) All of the above are evidence of a chemical reaction.

E

Which of the following items does NOT contain chemicals? A. drain cleaner B. organically grown vegetables C. air D. insecticides E. All of the above contain chemicals.

E

Which of the following statements is FALSE? A. Matter may be a pure substance or it may be a mixture. B. A pure substance may either be an element or a compound. C. A mixture may be either homogeneous or heterogeneous. D. Mixtures may be composed of two or more elements, two or more compounds, or a combination of both E. All of the above statements are true.

E

Which of these is an example of a physical property? A. Corrosiveness of sulfuric acid B. Toxicity of cyanide C. Flammability of gasoline D. Neutralization of stomach acid with an antacid E. Lead becomes a liquid when heated to 601°C.

E