Chemistry Midterm Practice

In an atom, an orbital represents

• the most probably location of a proton

• the most probable location of an electron

• the least probably location of a neutron

• photons emitted as electrons move to lower energy levels

Which particle has a mass so small, it is considered to be 0 amu?

• proton

• hydrogen nucleus

• neutron

• electron

During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

Tags

NGSS.HS-PS1-2

What quantity is the same among atoms of the same element?

• mass number

• atomic number

• number of neutrons

• number of nucleons

An atom that has 8 protons and 10 neutrons is an isotope of the element

• nitrogen

• oxygen

• fluorine

• neon

Tags

NGSS.HS-PS1-8

How would you classify NaCl?

• element

• compound

• heterogeneous mixture

• homogeneous mixture

Tags

NGSS.MS-PS1-1

How many protons and electrons are in a copper (II) ion with a mass of 64?

• 27 protons, 29 electrons
• 27 protons, 31 electrons
• 29 protons, 27 electrons
• 29 protons, 31 electrons

Tags

NGSS.HS-PS1-1

Which element contains 3 valence electrons?

• helium
• lithium
• beryllium
• boron

Tags

NGSS.HS-PS1-1

A mixture that is NOT evenly distributed is called ....

• Compounded
• Homogenous
• Heterogenous
• Salty

What is the formula for density?

• density = mass x volume
• density = mass / volume
• density = mass + volume
• density = mass - volume

Tags

CCSS.HSG.MG.A.2