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CHEM 101 PRACTICE TEST COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (ALREADY GRADED A+)
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CHEM 101 PRACTICE TEST COMPLETE QUESTIONS AND CORRECT DETAILED ANSWERS (ALREADY GRADED A+) The nucleus of an atom contains: A) Protons and electrons B) Protons and neutrons C) Electrons and neutrons D) Protons, neutrons and electrons E) Electrons only - Answer-B The nucleus of an atom cont...

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  • September 17, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • chem 101
  • chem 101 practice test
  • chem 101 practice test complete questions
  • the nucleus of an atom contains

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  • CHEM 101
  • CHEM 101

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CHEM 101 PRACTICE TEST COMPLETE
QUESTIONS AND CORRECT DETAILED
ANSWERS (ALREADY GRADED A+)
The nucleus of an atom contains:
A) Protons and electrons
B) Protons and neutrons
C) Electrons and neutrons
D) Protons, neutrons and electrons
E) Electrons only - Answer-B

The nucleus of an atom contains protons and neutrons.

Which subatomic particle is found in the nucleus and has no charge?
A) Electron
B) Neutron
C) Proton
D) Positron - Answer-B

Neutrons are subatomic particles found in the nucleus that have no charge.

How many protons are in an atom of strontium-90?
A) 2
B) 38
C) 87.62
D) 90 - Answer-B

Strontium has an atomic number of 38. The atomic number is the number of protons in
an atom.

What is the mass number for an atom of osmium containing 76 protons and 113
neutrons? - Answer-189

The mass number of an atom is representative of the number of protons and neutrons.
The number of protons can be found from the atomic number of the element on the
periodic table. Calculate the mass number using the given number of protons and
neutrons. For example, if there are 76 protons and 113 neutrons, the mass number can
be calculated like this: 76+113=189

What is the mass number of tin-120? - Answer-120

Isotopes can be written as "element-mass number". For example, "tin-120" indicates an
atom of tin with a mass number of 120.

, What is the atomic number for an element whose mass number is 115, which contains
66 neutrons per atom? - Answer-49

The mass number of an atom is representative of the number of protons and neutrons.
The number of protons can be found from the atomic number of the element on the
periodic table. Calculate the number of protons/atomic number using the given mass
number and neutrons. For example, if an atom has a mass number of 115 and contains
66 neutrons, the number of protons/atomic number can be calculated like this: 115-
66=49

What is the atomic number for an element whose mass number is 152, which contains
89 neutrons per atom? - Answer-63

. .The mass number of an atom is representative of the number of protons and
neutrons. The number of protons can be found from the atomic number of the element
on the periodic table. Calculate the number of protons/atomic number using the given
mass number and neutrons. For example, if an atom has a mass number of 152 and
contains 89 neutrons, the number of protons/atomic number can be calculated like this:

Determine the mass in grams of 3.00 × 10²¹ atoms of arsenic. (The mass of one mole of
arsenic is 74.92 g.) - Answer-0.373g

.The number of moles of a substance can be calculated using Avogadro's number.
Then, the mass can be calculated using the molar mass.

Determine the mass in grams of 3.75 × 10²¹ atoms of zinc. (The mass of one mole of
zinc is 65.39 g.) - Answer-0.407g



A homogeneous mixture is also called a - Answer-solution

(A solution is a type of homogeneous mixture composed of two or more)

The following picture would be best described as

(circles red and blue, close but not packed together or loosely). - Answer-a liquid
mixture

(The picture is best described as a liquid mixture. Liquids do not have a definite shape
but do not fill the entire container, so the particles are found only on the bottom of the
container. Mixtures contain two different types of particles (shown here in different
colors) which are not chemically bound.)

Which one of the following is an example of a compound? - Answer-water

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