Question 1

Which of the following is a chemical reaction?

Accepted Answer

Rusting of iron is a chemical reaction because it involves the iron reacting with oxygen in the air to form iron oxide, a new substance with different properties from the original iron.

Question 2

What is the coefficient of HClO₄ when the following equation is balanced with smallest whole numbers? Cl₂O₇ + H₂O ? HClO₄

Accepted Answer

The balanced equation is Cl2O7 + H2O → 2 HClO4. The coefficient of HClO4 is 2.

Question 3

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₂H₆ + O₂ ? CO₂ + H₂O

Accepted Answer

The answer of What is the coefficient for O₂ when...

Question 4

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₃H₇OH + O₂ ? CO₂ + H₂O

Accepted Answer

To balance the equation, we first balance the carbon (C), then hydrogen (H), and finally oxygen (O). The given equation is:$$ \text{CH}_3\text{OH} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} $$Balancing carbon and hydrogen first:- There is 1 C on both sides.- There are 4 H atoms on the left (in CH3OH), so we need 2 H2O on the right to balance hydrogen.Now, balancing oxygen:- There are 2 O atoms in CO2 and 2 in 2 H2O, making 4 O atoms on the right side. To balance oxygen, we need 2 O2 molecules on the left side, because the original CH3OH contributes 1 O atom, requiring 3 more O atoms from O2, which means we need 1.5 O2 to balance. However, to keep the coefficients as whole numbers, we double all coefficients, leading to:$$ 2 \text{CH}_3\text{OH} + 3 \text{O}_2 \rightarrow 2 \text{CO}_2 + 3 \text{H}_2\text{O} $$Thus, the coefficient for O2 (O₂) when the equation is balanced with the lowest whole number coefficients is 3.

Question 5

What is the total of all the coefficients when the following equation is balanced with the lowest whole number coefficients? N₂H₄ + H₂O₂ ? N₂ + H₂O

Accepted Answer

The balanced equation is N2H4 + 2H2O2 -> N2 + 4H2O. The coefficients are 1, 2, 1, and 4, which sum to 8.

Question 6

Steam is a mixture.

Accepted Answer

Steam is considered a pure substance when it is in the vapor phase of water alone, not mixed with other gases or vapors.

Question 7

Selenium is a nonmetal.

Accepted Answer

Selenium is classified as a nonmetal because it possesses properties that are characteristic of nonmetals, such as poor conductivity of heat and electricity, and it forms acidic oxides.

Question 8

A group is a vertical column on the periodic table.

Accepted Answer

In the periodic table, a group is indeed a vertical column, and elements in the same group typically have similar chemical properties.

Question 9

Radon is a noble gas.

Accepted Answer

Radon is a noble gas, which is a group of chemical elements with similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.

Question 10

Antimony is a metal.

Accepted Answer

Antimony is classified as a metalloid, which means it has properties of both metals and non-metals.

Question 11

Iron is an example of a micronutrient.

Accepted Answer

Iron is considered a micronutrient because it is required by organisms in small quantities for proper physiological and biochemical functions but is not produced by the organism itself.

Question 12

1 m = 10^-6?m

Accepted Answer

1 m is equal to 10^6 µm (micrometers), not 10^-6 m.

Question 13

Kinetic energy is stored energy.

Accepted Answer

Kinetic energy is the energy of motion, not stored energy. Stored energy is referred to as potential energy.

Question 14

A Calorie is equivalent to 1000 calories.

Accepted Answer

A Calorie (with a capital C) is equivalent to 1000 calories (with a lowercase c) and is also known as a kilocalorie, which is the unit of energy commonly used to express the energy content of food.

Question 15

Classify each of the following as a pure substance or a mixture; if a mixture, indicate whether it is homogeneous or heterogeneous.
A)Concrete
B)Iodine crystals
C)Gasoline
D)White chocolate macadamia nut cookies
E)Vegetable soup
F)Aluminum metal

Accepted Answer

The answer of Classify each of the following as a...

Question 16

Identify the number of particles of each element in the following compounds: A)H₂O₂ - hydrogen peroxide B)C₆H₁₂O₆ - glucose C)CaCO₃ - chalk

Accepted Answer

The answer of Identify the number of particles of each...

Question 17

Write the total number of atoms in each of the following formulas. A)CuSO₄.5H₂O B)(NH₄)₃PO₄ C)C₆H₄(CH₃)(C₂H₅)? D)AlO(NO₃)₂ E)Fe₃(PO₄)₂

Accepted Answer

The answer of Write the total number of atoms in...

Question 18

A vertical column in the periodic table is called a ________.

Accepted Answer

The answer of A vertical column in the periodic table...

Question 19

What is the number of significant figures in each of the following numbers? A)20.03 kg ________ B)190. L ________ C)120 M ________ D)0.00067 cm³ ________ E)0.0580 in ________ F)35,500 people ________ D)0.00067 cm³ ________

Accepted Answer

The answer of What is the number of significant figures...

Question 20

Express the following numbers in scientific notation.
A)109,000
B)0.00065
C)61,000,000,000
D)26
E)0.00000720

Accepted Answer

The answer of Express the following numbers in scientific notation.
A)109,000
B)0.00065
C)61,000,000,000
D)26
E)0.00000720...

Quiz 1: Chemistry Basics - Matter and Measurement

Which of the following is a chemical reaction?

What is the coefficient of HClO₄ when the following equation is balanced with smallest whole numbers? Cl₂O₇ + H₂O ? HClO₄

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₂H₆ + O₂ ? CO₂ + H₂O

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₃H₇OH + O₂ ? CO₂ + H₂O

What is the total of all the coefficients when the following equation is balanced with the lowest whole number coefficients? N₂H₄ + H₂O₂ ? N₂ + H₂O

Steam is a mixture.

Selenium is a nonmetal.

A group is a vertical column on the periodic table.

Radon is a noble gas.

Antimony is a metal.

Iron is an example of a micronutrient.

1 m = 10^-6?m

Kinetic energy is stored energy.

A Calorie is equivalent to 1000 calories.

Classify each of the following as a pure substance or a mixture; if a mixture, indicate whether it is homogeneous or heterogeneous. A)Concrete B)Iodine crystals C)Gasoline D)White chocolate macadamia nut cookies E)Vegetable soup F)Aluminum metal

Identify the number of particles of each element in the following compounds: A)H₂O₂ - hydrogen peroxide B)C₆H₁₂O₆ - glucose C)CaCO₃ - chalk

Write the total number of atoms in each of the following formulas. A)CuSO₄.5H₂O B)(NH₄)₃PO₄ C)C₆H₄(CH₃)(C₂H₅)? D)AlO(NO₃)₂ E)Fe₃(PO₄)₂

A vertical column in the periodic table is called a ________.

What is the number of significant figures in each of the following numbers? A)20.03 kg B)190. L C)120 M D)0.00067 cm³ E)0.0580 in F)35,500 people D)0.00067 cm³

Express the following numbers in scientific notation. A)109,000 B)0.00065 C)61,000,000,000 D)26 E)0.00000720

Quiz 1: Chemistry Basics - Matter and Measurement

Which of the following is a chemical reaction?

What is the coefficient of HClO4 when the following equation is balanced with smallest whole numbers? Cl2O7 + H2O ? HClO4

What is the coefficient for O2 when this equation is balanced with the lowest whole number coefficients? C2H6 + O2 ? CO2 + H2O

What is the coefficient for O2 when this equation is balanced with the lowest whole number coefficients? C3H7OH + O2 ? CO2 + H2O

What is the total of all the coefficients when the following equation is balanced with the lowest whole number coefficients? N2H4 + H2O2 ? N2 + H2O

Steam is a mixture.

Selenium is a nonmetal.

A group is a vertical column on the periodic table.

Radon is a noble gas.

Antimony is a metal.

Iron is an example of a micronutrient.

1 m = 10-6?m

Kinetic energy is stored energy.

A Calorie is equivalent to 1000 calories.

Classify each of the following as a pure substance or a mixture; if a mixture, indicate whether it is homogeneous or heterogeneous. A)Concrete B)Iodine crystals C)Gasoline D)White chocolate macadamia nut cookies E)Vegetable soup F)Aluminum metal

Identify the number of particles of each element in the following compounds: A)H2O2 - hydrogen peroxide B)C6H12O6 - glucose C)CaCO3 - chalk

Write the total number of atoms in each of the following formulas. A)CuSO4.5H2O B)(NH4)3PO4 C)C6H4(CH3)(C2H5)? D)AlO(NO3)2 E)Fe3(PO4)2

A vertical column in the periodic table is called a ________.

What is the number of significant figures in each of the following numbers? A)20.03 kg ________ B)190. L ________ C)120 M ________ D)0.00067 cm3 ________ E)0.0580 in ________ F)35,500 people ________ D)0.00067 cm3 ________

Express the following numbers in scientific notation. A)109,000 B)0.00065 C)61,000,000,000 D)26 E)0.00000720

What is the coefficient of HClO₄ when the following equation is balanced with smallest whole numbers? Cl₂O₇ + H₂O ? HClO₄

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₂H₆ + O₂ ? CO₂ + H₂O

What is the coefficient for O₂ when this equation is balanced with the lowest whole number coefficients? C₃H₇OH + O₂ ? CO₂ + H₂O

What is the total of all the coefficients when the following equation is balanced with the lowest whole number coefficients? N₂H₄ + H₂O₂ ? N₂ + H₂O

1 m = 10^-6?m

Identify the number of particles of each element in the following compounds: A)H₂O₂ - hydrogen peroxide B)C₆H₁₂O₆ - glucose C)CaCO₃ - chalk

Write the total number of atoms in each of the following formulas. A)CuSO₄.5H₂O B)(NH₄)₃PO₄ C)C₆H₄(CH₃)(C₂H₅)? D)AlO(NO₃)₂ E)Fe₃(PO₄)₂

What is the number of significant figures in each of the following numbers? A)20.03 kg B)190. L C)120 M D)0.00067 cm³ E)0.0580 in F)35,500 people D)0.00067 cm³