Biology Exam

The three particles that make up atoms are

• protons, neutrons, and isotopes.
• neutrons, isotopes, and electrons.
• positives, negatives, and neutrals.
• protons, neutrons, and electrons.

What are found in the space surrounding the nucleus of an atom?

• protons
• electrons
• neutrons
• ions

Which of the following makes up a molecule of water?

• one atom of hydrogen one atom of oxygen
• one atom of sodium and one atom of chlorine
• one atom of hydrogen and two atoms of oxygen
• two atoms of hydrogen and one atom of oxygen

Tags

NGSS.MS-PS1-1

A covalent bond is formed as the result of

• transferring electrons
• sharing electrons
• transferring protons
• sharing protons

Tags

NGSS.HS-PS1-1

Which property of water causes the curved surface shown in the figure with the graduated cylinder with curved water at the top?

• pH
• cohesion
• adhesion
• heat capacity

Water molecules are polar, with the

• oxygen side being slightly positive and the hydrogen side being slightly negative
• oxygen and hydrogen sides being slightly positive
• oxygen and hydrogen sides being slightly negative.
• oxygen side being slightly negative and the hydrogen side being slightly positive

In a water molecule, shared electrons spend more time around the oxygen atom than the hydrogen atoms. As a result, the oxygen atom is

• slightly negative
• very negative
• slighly positive
• very positive

A solution is a

• combination of isotopes
• chemical reaction
• mixture in which the substances are evenly spread out
• mixture in which undissolved substances do not settle out

If you stir salt into boiling water, you produce a

• mixture called a suspension
• mixture called a solution
• solution and suspension
• mixture only

When salt is dissolved in water, water is the

• reactant
• solution
• solute
• solvent