Unraveling Atomic Mass and Its Significance in Chemistry

Unraveling Atomic Mass and Its Significance in Chemistry

Assessment

Interactive Video

Chemistry, Physics, Science

9th - 12th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video explores the fascinating world of chemistry, focusing on the atomic and subatomic scales. It introduces the concept of atomic mass units (AMU) and their modern equivalent, the unified atomic mass unit (u), explaining their significance in measuring mass at a small scale. The video discusses the mass of protons, neutrons, and electrons, and how these contribute to the atomic mass of elements. It also covers the periodic table, highlighting how atomic numbers define elements and the concept of isotopes. The video concludes with an explanation of average atomic mass and its calculation as a weighted average of isotopes.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary focus of chemistry as discussed in the video?

Exploring biological systems

Understanding large-scale phenomena

Studying the universe at an atomic level

Analyzing geological formations

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the unified atomic mass unit (u) defined in terms of kilograms?

1.6605 x 10^-30 kg

1.6605 x 10^-23 kg

1.6605 x 10^-20 kg

1.6605 x 10^-27 kg

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which subatomic particle has a mass approximately equal to one unified atomic mass unit?

Quark

Photon

Electron

Neutron

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element is defined by having exactly 20 protons in its nucleus?

Oxygen

Krypton

Calcium

Hydrogen

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the term used for different versions of the same element with varying numbers of neutrons?

Isomers

Isotopes

Ions

Allotropes

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the average atomic mass of an element determined?

By measuring the mass of a single atom

By calculating the weighted average of its isotopes

By using the atomic number

By adding the masses of protons and electrons

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the approximate mass of a hydrogen atom with one proton and one electron?

0.500 unified atomic mass units

2.000 unified atomic mass units

1.000 unified atomic mass units

1.008 unified atomic mass units

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