Make-up Work Chem 3

Make-up Work Chem 3

11th Grade

9 Qs

quiz-placeholder

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Make-up Work Chem 3

Make-up Work Chem 3

Assessment

Quiz

11th Grade

Medium

Created by

Carla Turner

Used 5+ times

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9 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 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

2.

MULTIPLE CHOICE QUESTION

2 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
24.97 amu
75.01 amu
74.51 amu

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Media Image

Compute the average atomic mass for silicon:

27.977
28.09
28.976
The average mass cannot be determined from provided information.

4.

MULTIPLE CHOICE QUESTION

30 sec • 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

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Media Image

What is the name of the atom pictured here?

Nitrogen
Nitrogen-15
Nitrogen-7
Nitrogen-8

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

Atom 1 has Mass=12  Protons=6
Atom 2 has Mass= 14 Electrons=6
Are these atoms isotopes of each other or different elements?

Different Elements - Mg & Si
Different Elements - Ar & Ca
Isotopes of Carbon
Isotopes of Magnesium

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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