Quiz 2 - Topics 1, 2, 3

Aria, Ethan, and Sophia are working on a science project about atoms. They need to identify the three basic parts of an atom. What should they list?

• Protons, electrons, and neutrons

• Protons, electrons, and photons

• Protons, electrons, and ions

• Protons, electrons, and isotopes

Answer explanation

The correct answer is 'Protons, electrons, and neutrons'. These are the three fundamental components of an atom. Protons and neutrons form the nucleus of the atom, while electrons orbit around the nucleus. The other options included photons, ions, and isotopes, which are related to atoms but are not their basic parts.

Tags

NGSS.MS-PS1-1

What is the goal of atoms when forming covalent bonds?

• To gain electrons

• To lose electrons

• To share electrons

• To transfer electrons

Answer explanation

The goal of atoms when forming covalent bonds is to share electrons. This is because, in a covalent bond, the atoms share one or more pairs of outer-shell electrons, which helps in the completion of their respective electron configurations, leading to stability.

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons

Tags

NGSS.HS-PS1-2

What two types of atoms make a covalent bond?

• 2 Nonmetals
• 1 Nonmetal and 1 Metal
• 2 Metals
• 2 Noble Gases

Tags

NGSS.HS-PS1-1

Valence electrons are those that are

• closest to the nucleus.

• freely floating between atoms.

• in the outermost energy level of the atom.

• unable to become involved in chemical bonding.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is not a way that ions can form?

• gaining electrons

• gaining protons

• losing electrons

• All of the above are ways that ions can form.

Of the choices below, which of the following most likely contains covalent bonds?

• PCl₅

• RbCl

• PbCl₂

• MoCl₆

Answer explanation

Covalent bonds are formed between non-metals sharing electrons.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-4

The table shows information for four different elements

A cube of an unknown element has a shiny, silvery color. The side of the cube measures 2.0 cm and the cube has a mass of 14.56 g.

 

Based on the information in the table, which element makes up the cube?

• barium

• beryllium

• phosphorus

• chromium

Answer explanation

The table provides us with density values, as well as classification. The density can be calculated using: d = mass/volume. The volume for a cube is v=length x width x height. For a cube having sides 2.0cm, its volume v = 8 cm3.

d = 14.56g/8 cm3 = 1.8 g/cm3.

From there, we narrow down the choice based on the description provided and classification. It can't be phosphorus since it is classified as a non-metal and not aligned with the description.

Tags

DCI.ESS2.C.9-12.8

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

CCC.5.9-10.10

How many protons does this isotope of titanium have?

• 48
• 22
• 26
• 70

Tags

CCC.5.9-10.10