Which is true in a covalent bond?

• The bond is caused by van der Waals forces

• The bond forms when electrons are shared

• The bod forms between ions

• The bond forms when electrons are donated

Tags

NGSS.HS-PS1-1

Elements are placed into the same group on the periodic table of elements because they.....

• form the same isotopes

• have similar chemical properties

• have the same number of protons

• have same number electron energy levels

Tags

NGSS.HS-PS1-1

Which equation satisfies the law of conservation of matter?

• 3O2 + 2AI --> 3AIO3

• 4O2 + 3AI --> 3AIO3

• 3O2 + 2AI --> 2AIO3

• 4O2 + AI. --> AIO3

Tags

NGSS.HS-PS1-7

Biological buffers work to keep the pH in your body in a range of _______.

• 5.5-6.5

• 7.5-8.5

• 4.5-5.5

• 6.5-7.5

Which macromolecule is involved in nearly every function of the human body?

• Lipid

• Carbohydrate

• Protein

• Nucleic Acid

Tags

NGSS.HS-LS1-1

Which macromolecule is responsible for the formation of the cell's membrane?

• Lipids

• Nucleic acids

• proteins

• carbohydrates

Positively charge particles in an atom are called ________.

• electrons

• protons

• ions

• ionic

Tags

NGSS.MS-PS1-1

Two atoms of uranium that differ in their number of neutrons are called ____.

• ions

• isotopes

• neutrons

• electrons

Tags

NGSS.HS-PS1-8

The hydrogen, oxygen, and carbon atoms in glucose molecule are held together by ______ bonds.

• covalent

• mixture

• ionic

• substance

Ammonia is a compound that forms hydroxide ions when it is dissolved in water; it is a ______.

• proton

• ionic

• mixture

• solute