Chemistry Definitions and Formulas Quiz

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Questions and Answers

How many hydrogen atoms are indicated by the formula (NH₄)₂C₆H₈O₂?

16 (correct)

What is the total number of oxygen atoms indicated by the formula Cu₃(PO₄)₂?

12 (correct)

How many significant figures are in the number 60.02 x 10^5?

4 (correct)

A cubic centimeter (cm³) is equivalent to what other metric volume unit?

milliliter Signup and view all the answers

What is the specific heat (J/g∙°C) of a metal object whose temperature increases by 3.0°C when 17.5 g of metal was heated with 38.5 J?

0.73 Signup and view all the answers

What is the volume in mL of 38.6 L?

38600 Signup and view all the answers

The number 14.809 rounded to three significant figures is?

14.8 Signup and view all the answers

How should the temperature be reported when the mercury level is exactly between the 25 and 26 degree Celsius marks?

25.5°C Signup and view all the answers

Which of the following describes a chemical property of gold?

Gold is an inert (nonreactive) metal. Signup and view all the answers

What is the correct number of significant figures in the number 0.002320?

4 Signup and view all the answers

What is the correct decimal representation of 1.201 × 10^-7?

0.0000001201 Signup and view all the answers

What is the percent difference between a measured specific heat of 5.88 J/g°C and a true value of 7.21 J/g°C?

29.0% Signup and view all the answers

Which statement about immiscible liquids is false?

They will form a homogeneous solution. Signup and view all the answers

Group 1A elements are also referred to as which type of metals?

Alkali metals Signup and view all the answers

Which statement about the periodic table is false?

The noble gases are the most reactive of all elements. Signup and view all the answers

Which of these processes involves a chemical change?

Oxidation Signup and view all the answers

What is the term for the degree of agreement among several measurements of the same quantity?

Precision Signup and view all the answers

Which chemical formula represents the ammonium ion?

NH4^+ Signup and view all the answers

What describes the process that has a negative enthalpy change?

Energy released by the system Signup and view all the answers

What is the formula for the ionic compound formed from lead(IV) and sulfate?

Pb(SO4)2 Signup and view all the answers

Which of the following compounds forms from calcium ions and nitrate ions?

Ca(NO3)2 Signup and view all the answers

What is the percentage of oxygen in a sample consisting of 10.65 g of carbon, 3.547 g of hydrogen, and 6.473 g of oxygen?

31.62% Signup and view all the answers

When comparing four substances with different heat capacities absorbing the same amount of heat, which would have the lowest final temperature?

A substance with low heat capacity Signup and view all the answers

Which of the following describes an ionic compound formed from aluminum ion and carbonate ions?

Al2(CO3)3 Signup and view all the answers

Study Notes

Definitions

Precision: The degree of agreement among several measurements of the same quantity.
Reproducibility: The ability to obtain the same results when a measurement is repeated.
Specific Heat: The amount of heat required to raise the temperature of one gram of a particular substance by one degree Celsius.
Isotopes: Two or more atoms of the same element with the same atomic number (number of protons) and nearly identical chemical behaviour, but with a differing mass number (number of protons plus neutrons).
Heterogeneous Mixture: A mixture consisting of dissimilar or diverse ingredients that are not evenly distributed throughout.

Chemical Formulas

Ammonium: NH₄⁺
Sulfate: SO₄^2-
Sodium ion: Na⁺
Phosphate: PO₄^3-
Aluminum ion: Al³⁺
Carbonate: CO₃^2-
Calcium ion: Ca²⁺
Nitrate: NO₃^-

Ionic Compounds

Cation	NO₃^-	CO₃^2-	Cl^-	OH^-
NH₄⁺	NH₄NO₃	(NH₄)₂CO₃	NH₄Cl	NH₄OH
Ba²⁺	Ba(NO₃)₂	BaCO₃	BaCl₂	Ba(OH)₂
Al³⁺	Al(NO₃)₃	Al₂(CO₃)₃	AlCl₃	Al(OH)₃

Enthalpy Change

The reaction of hydrogen gas and oxygen gas to produce water is exothermic.
This means energy is released by the system.

Ionic Compounds Formed

a. PbSO₂
b. Ca(NO₃)₂
c. Ba₃(PO₄)₂

Ionic Compounds Names

a. Lead(IV) Sulfate
b. Calcium Nitrate
c. Barium Phosphate

Percentage Composition

The percentage of oxygen in the sample is 31.4%.

Specific Heat and Temperature

Reasoning: The substance with the lowest specific heat capacity will have the lowest temperature after absorbing the same amount of heat. This is because a lower specific heat capacity means less heat is required to raise the temperature of the substance by one degree Celsius, resulting in a greater temperature change for the same amount of heat absorbed.
Conclusion: Lead will have the lowest temperature after absorbing 100.0 kJ of heat because it has the lowest specific heat capacity.

Volume of Air

The volume of air that contains 682 mL of argon is 73,333 mL or 73.33 L.

Density of Solid

a. The volume of the solid is 35 mL.
b. The density of the solid is 1.4 g/mL.

Multiple Choice Questions

1. C: Report the measurement as 25.5°C.
1. B: The correct number of significant figures is 4.
1. C: The correct decimal representation is 0.0000001201.
1. C: The percent difference is 18.4%.
1. C: Hexane is not miscible with water.
1. D: Group 1A elements are called alkali metals.
1. D: Elements in the same horizontal row of the table do not have similar physical characteristics.
1. C: Oxidation involves a chemical change.
1. D: There are 14 hydrogen atoms in the formula.
1. A: There are 8 oxygen atoms in the formula.
1. B: 38.6 L = 38,600 mL.
1. A: 34.4 g = 0.0344 kg.
1. A: 3.002.
1. C: 4.
1. E: 14.8.
1. A: A cubic centimeter is equivalent to a milliliter.
1. B: Gold is an inert (nonreactive) metal.
1. D: A homogeneous mixture is also called a solution.
1. D: Titanium(IV) oxide has the formula TiO₂.
1. C: The specific heat of the metal object is 0.73 J/g∙°C.
1. 10.5 kJ: The amount of heat needed to raise the temperature of water from 25.0 °C to 50.0 °C is 10.5 kJ.

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Description

Test your knowledge on key chemistry definitions and chemical formulas. This quiz covers concepts like precision, isotopes, and the specific heat of substances, as well as various chemical ions. Ideal for students wanting to reinforce their understanding in chemistry.