Average Atomic Mass

Average Atomic Mass

11th Grade

10 Qs

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Average Atomic Mass

Average Atomic Mass

Assessment

Quiz

Chemistry

11th Grade

Medium

NGSS
MS-PS1-1

Standards-aligned

Created by

April Harris

Used 6+ times

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.

What is the average mass of this element?

74.92 amu

75.00 amu

25 amu

24.9733 amu

2.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?

32
33
34
no way to know

Tags

NGSS.MS-PS1-1

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Calcium has three different isotopes. One has a mass of 35.00 amu; another has a mass of 41.00 amu; and another has a mass of 40.00 amu. Which isotope is the most abundant of the three?

40.00 amu
41.00 amu
35.00 amu
impossible to tell

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

An element with 4.35% have a mass of 49.9461 amu, 83.79% have amass of 51.9405 amu, 9.50% have a mass of 52.9407 amu, and 2.36% have a mass of 53.9389amu.

51.9959 amu

52.996 amu

12.999 amu

17.33 amu

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?

41.97 amu
42.19 amu
10.43 amu
40.04 amu

Tags

NGSS.MS-PS1-1

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

Calculate the average atomic mass of silver.

106.38649amu

111.91896amu

107.86770amu

121

7.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?

9.012, Beryllium
12.011, Carbon
6.941, Lithium
10.812, Boron

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