Biology Dynamics of Life

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

If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is

• 3
• 4
• 7
• 11

If an atom contains 11 protons and 12 neutrons, its atomic number is

• 1
• 11
• 12
• 23

Which of the following is a substance formed by the chemical joining of two or more elements in definite amounts?

• compound
• isotope
• nucleus
• enyme

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

Tags

NGSS.HS-PS2-6