Unit 1B Practice Test Accelerated Science

Protons and neutrons are found in the center of the atom called the:

• nucleus

• neutron

• shell

• cell

Answer explanation

Protons and neutrons are located in the nucleus, which is the central part of the atom. The other options, shell and cell, do not refer to the center of the atom. The neutron is part of the nucleus, but is not the only subatomic particle found in the nucleus.

What is the sum of an atom's protons and neutrons called?

• atom

• atomic theory

• atomic mass

• atomic number

Answer explanation

The sum of an atom's protons and neutrons is called the atomic mass. This value reflects the total number of these particles in the nucleus, distinguishing it from the atomic number, which counts only protons.

The _____ is based on the number of protons in the nucleus of the atom or the number of electrons in the electron shell(s).

• atomic structure

• periodic table of the elements

• atomic number

• atomic mass

Answer explanation

The atomic number is defined as the number of protons in the nucleus of an atom or the number of electrons in the electron shell(s). It uniquely identifies an element and determines its position in the periodic table, making 'atomic number' the correct choice.

Tags

NGSS.HS-PS1-1

What does the 1.00794 stand for?

• Hydrogen

• atomic number

• atomic mass

• atomic explosion

Answer explanation

The value 1.00794 represents the atomic mass of hydrogen. It is not the atomic number, which is 1, nor does it relate to atomic explosion.

Tags

NGSS.MS-PS1-1

An atom with atomic number 6 would have how many protons

• 6

• 12

• 3

• cannot be determined

Answer explanation

An atom's atomic number indicates the number of protons it has. Since the atomic number 6 corresponds to carbon, it has 6 protons. Therefore, the correct answer is 6.

What is the number of protons that the element in this image contain?

• 14

• 7

• 15

• 18

Answer explanation

The element in the image is nitrogen, which has an atomic number of 7. This means it contains 7 protons, making the correct answer 7.

Tags

NGSS.MS-PS1-1

What is the atomic mass of Fluorine?

• 9

• 18

• 17

• 19

Answer explanation

The atomic mass of fluorine (F) is approximately 19 atomic mass units. This value reflects rounding the atomic mass to the nearest whole number, making 19 the correct answer.

What are the 3 subatomic particles that make-up the atom?

• protons, neutrons, and isotopes

• neutrons, isotopes, and electrons

• positives, negatives, and electrons

• protons, neutrons, and electrons

Answer explanation

The correct answer is protons, neutrons, and electrons, as these are the three fundamental particles that make up an atom.

Tags

NGSS.MS-PS1-1

What is H₂SO₄

made up of?

• 2 hydrogen, 1 sulfur, 4 oxygen

• 2 hydrogen & 4 sodium

• 1 hydrogen, 2 sulfur, 4 oxygen

• 1 hydrogen & 6 sodium

Answer explanation

H2SO4, known as sulfuric acid, is composed of 2 hydrogen (H), 1 sulfur (S), and 4 oxygen (O) atoms. Therefore, the correct answer is '2 hydrogen, 1 sulfur, 4 oxygen'.

Tags

Science 6.5A

What is the coefficient for this formula? 9NaCl₂

• 9

• 2

• 1

• 11

Answer explanation

In the formula 9NaCl2, the coefficient is the number in front of the compound. Here, '9' indicates there are 9 units of NaCl2, making the correct answer 9.