Chem Final exam

Which subatomic particle has a negative charge?

• Positron

• Proton

• Neutron

• Electron

What is the atomic number of an element?

• The number of electrons

• The number of protons

• The number of neutrons

• The sum of protons and neutrons

Which of the following is an example of a chemical change?

• Melting ice

• Dissolving sugar in water

• Burning wood

• Tearing paper

Tags

NGSS.MS-PS1-2

Which bond involves the sharing of electron pairs between atoms?

• Covalent

• Hydrogen

• Metallic

• Ionic

Tags

NGSS.HS-PS1-1

Which of the following has the highest electronegativity?

• Oxygen

• Nitrogen

• Fluorine

• Carbon

The law of conservation of mass states that

• Mass is neither created nor destroyed

• Mass can be destroyed

• Mass can be created

• Mass is conserved only in physical changes

Tags

NGSS.MS-PS1-5

Which element has the electron configuration (1s^2 2s^2 2p^6 3s^2 3p^4)

• Oxygen

• Chlorine

• Phosphorus

• Sulfur

Tags

NGSS.MS-PS1-1

In a chemical equation, the reactants are found

• On the left side

• on the right side

• Below the arrow

• Above the arrow

What is the molar mass of H2O?

• 18 g/mol

• 20 g/mol

• 16 g/mol

• 22 g/mol

Which type of reaction involves the exchange of ions between two compounds?

• single replacement

• Synthesis

• double replacement

• Decomposition