Question 1

Average atomic masses are used in the periodic table. These values give the true representation of mixtures of isotopes for different elements that are consistent around the world and universe.

Accepted Answer

The answer of Average atomic masses are used in the...

Question 2

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Accepted Answer

During the nucleosynthesis stage of the Big Bang, temperatures were extremely high, which meant that particles had high kinetic energy. This high energy prevented protons and neutrons from coming together and stabilizing into heavier elements, allowing only light elements like hydrogen and helium to form.

Question 3

Assuming that most of the mass of the universe is found in stars, why is hydrogen still the most common element in the universe? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Accepted Answer

High temperatures in stars prevent protons and neutrons from stabilizing into heavier elements, keeping hydrogen as the most abundant element.

Question 4

A compound of hydrogen and sulfur contains 2.69 grams of hydrogen and 47.31 grams of sulfur. Another sample of the same compound that contains 75.63 grams of sulfur would contain how many grams of hydrogen? Hint: Consider the ratio of the masses to determine the mass of hydrogen

Accepted Answer

The ratio of the masses of hydrogen and sulfur in the compound is 2.69/47.31 = 0.0569. Therefore, a sample of the compound that contains 75.63 grams of sulfur would contain 75.63 * 0.0569 = 4.30 grams of hydrogen.

Question 5

Based on the law of Conservation of Mass, 1.2 g of elemental carbon (C)reacts with molecular oxygen (O₂)to produce 4.4 g of carbon dioxide gas (CO₂)as the only product. What mass of oxygen reacts?

Accepted Answer

According to the law of Conservation of Mass, the mass of reactants equals the mass of products. Since 1.2 g of carbon reacts to produce 4.4 g of CO2, the mass of oxygen that reacted is 4.4 g - 1.2 g = 3.2 g.

Question 6

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C)reacts with 4.8 g of molecular oxygen (O₂)to produce carbon dioxide gas (CO₂)as the only product. What mass of carbon dioxide is formed?

Accepted Answer

According to the law of Conservation of Mass, the mass of reactants equals the mass of products. Therefore, 1.8 g of carbon plus 4.8 g of oxygen equals 6.6 g of carbon dioxide.

Question 7

Based on the law of Conservation of Mass, 65.4 g of zinc metal reacts with exactly 32.1 g of sulfur to produce zinc sulfide (ZnS)as the only product. What mass of zinc sulfide can be formed from 10.0 g zinc metal? Hint: Consider the ratio of the masses to determine the mass of zinc sulfide.

Accepted Answer

The answer of Based on the law of Conservation of...

Question 8

The major isotopes of tungsten (with abundances shown)are ¹⁸²W (26.32%), ¹⁸³W (14.31%), ¹⁸⁴W (30.67%), and ¹⁸⁶W (28.62%). What is the atomic mass of tungsten?

Accepted Answer

The atomic mass of tungsten is a weighted average of the masses of its isotopes, taking into account their relative abundances. The calculation is as follows:(182 * 0.2632) + (183 * 0.1431) + (184 * 0.3067) + (186 * 0.2862) = 183.84Therefore, the atomic mass of tungsten is 183.84, which is closest to choice A, 184.

Question 9

A naturally occurring element consists of two isotopes. Calculate the average atomic mass and identify the element, based on the data below.
Isotope 1: 10.013 u 19.78 %
Isotope 2: 11.009 u ------% ,Hint: Percentages should always add up to 100% then find the weighted average.

Accepted Answer

The average atomic mass is calculated as (10.013 u * 0.1978) + (11.009 u * 0.8022) = 10.81 u, which corresponds to boron.

Question 10

A naturally occurring element consists of two isotopes. Calculate the fractional abundances for the two isotopes, if its average atomic mass is 107.87 u.
Isotope 1: 106.91 u ---- %
Isotope 2: 108.90 u ----- % ,Hint: Set up a weighted average calculation where one percentage is x and the other percentage is (100-x).

Accepted Answer

The answer of A naturally occurring element consists of two...

Quiz 1: A Very Brief History of Chemistry

Average atomic masses are used in the periodic table. These values give the true representation of mixtures of isotopes for different elements that are consistent around the world and universe.

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Assuming that most of the mass of the universe is found in stars, why is hydrogen still the most common element in the universe? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

A compound of hydrogen and sulfur contains 2.69 grams of hydrogen and 47.31 grams of sulfur. Another sample of the same compound that contains 75.63 grams of sulfur would contain how many grams of hydrogen? Hint: Consider the ratio of the masses to determine the mass of hydrogen

Based on the law of Conservation of Mass, 1.2 g of elemental carbon (C) reacts with molecular oxygen (O₂) to produce 4.4 g of carbon dioxide gas (CO₂) as the only product. What mass of oxygen reacts?

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C) reacts with 4.8 g of molecular oxygen (O₂) to produce carbon dioxide gas (CO₂) as the only product. What mass of carbon dioxide is formed?

Based on the law of Conservation of Mass, 65.4 g of zinc metal reacts with exactly 32.1 g of sulfur to produce zinc sulfide (ZnS) as the only product. What mass of zinc sulfide can be formed from 10.0 g zinc metal? Hint: Consider the ratio of the masses to determine the mass of zinc sulfide.

The major isotopes of tungsten (with abundances shown) are ¹⁸²W (26.32%) , ¹⁸³W (14.31%) , ¹⁸⁴W (30.67%) , and ¹⁸⁶W (28.62%) . What is the atomic mass of tungsten?

A naturally occurring element consists of two isotopes. Calculate the average atomic mass and identify the element, based on the data below. Isotope 1: 10.013 u 19.78 % Isotope 2: 11.009 u ------% ,Hint: Percentages should always add up to 100% then find the weighted average.

Quiz 1: A Very Brief History of Chemistry

Average atomic masses are used in the periodic table. These values give the true representation of mixtures of isotopes for different elements that are consistent around the world and universe.

What is the most logical reason for only light elements being formed during the nucleosynthesis stage of the big-bang? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

Assuming that most of the mass of the universe is found in stars, why is hydrogen still the most common element in the universe? Hint: Consider the kinetic energy of the particles and how kinetic energy can affect them coming together.

A compound of hydrogen and sulfur contains 2.69 grams of hydrogen and 47.31 grams of sulfur. Another sample of the same compound that contains 75.63 grams of sulfur would contain how many grams of hydrogen? Hint: Consider the ratio of the masses to determine the mass of hydrogen

Based on the law of Conservation of Mass, 1.2 g of elemental carbon (C) reacts with molecular oxygen (O2) to produce 4.4 g of carbon dioxide gas (CO2) as the only product. What mass of oxygen reacts?

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C) reacts with 4.8 g of molecular oxygen (O2) to produce carbon dioxide gas (CO2) as the only product. What mass of carbon dioxide is formed?

Based on the law of Conservation of Mass, 65.4 g of zinc metal reacts with exactly 32.1 g of sulfur to produce zinc sulfide (ZnS) as the only product. What mass of zinc sulfide can be formed from 10.0 g zinc metal? Hint: Consider the ratio of the masses to determine the mass of zinc sulfide.

The major isotopes of tungsten (with abundances shown) are 182W (26.32%) , 183W (14.31%) , 184W (30.67%) , and 186W (28.62%) . What is the atomic mass of tungsten?

A naturally occurring element consists of two isotopes. Calculate the average atomic mass and identify the element, based on the data below. Isotope 1: 10.013 u 19.78 % Isotope 2: 11.009 u ------% ,Hint: Percentages should always add up to 100% then find the weighted average.

Based on the law of Conservation of Mass, 1.2 g of elemental carbon (C) reacts with molecular oxygen (O₂) to produce 4.4 g of carbon dioxide gas (CO₂) as the only product. What mass of oxygen reacts?

Based on the law of Conservation of Mass, 1.8 g of elemental carbon (C) reacts with 4.8 g of molecular oxygen (O₂) to produce carbon dioxide gas (CO₂) as the only product. What mass of carbon dioxide is formed?

The major isotopes of tungsten (with abundances shown) are ¹⁸²W (26.32%) , ¹⁸³W (14.31%) , ¹⁸⁴W (30.67%) , and ¹⁸⁶W (28.62%) . What is the atomic mass of tungsten?