Biology 101 ** Unit 1 Review

A series of steps used by scientists to solve a problem or answer a question.

• Hypothesis

• Scientific method

• Data collection

• Experiment

What will happen when you place sodium chloride (NaCl) into a beaker of water?

• Na⁺ ions will be attracted to the oxygen end of the water molecule while the Cl^1- ions will be attracted to the hydrogen end of the water molecule.

• Na⁺ ions will be attracted to the hydrogen end of the water molecule while the Cl^1- ions will be attracted to the oxygen end of the water molecule.

• NaCl will sink to the bottom of the beaker of water and stay in crystal form.

• NaCl molecules will dissolve as whole particles.

Tags

NGSS.HS-ESS2-5

The number of valence electrons in an atom determines its

• identity.

• mass number.

• chemical behavior.

• atomic number.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

All the living organisms in a particular area along with all the nonliving aspects of the environment with which the organisms interac

• organism

• biosphere

• community

• ecosystem

Tags

NGSS.MS-LS2-3

A group of cells that work together, performing a specialized function.

• Cell

• Tissue

• Organism

• Organ

Tags

NGSS.MS-LS1-3

Sharing of a pair of electrons between two atoms.

• ionic bond

• covalent bond

• hydrogen bond

• electron bond

Transfer of an electron from one atom to another

• ionic bond

• covalent bond

• hydrogen bond

• electron bond

Tags

NGSS.MS-PS1-5

Which best describes what it means that "water is polar"?

• H and O share electrons unequally, causing partial charges on each end of the molecule.

• H and O share electrons equally, causing partial charges on each end of the molecule.

• H and O transfer electrons causing charges on each end of the molecule.

• I have no idea

Tags

NGSS.MS-ESS2-4

In a molecule containing H and F, which of those elements will form the partial negative charge and why?

• Neither -- they will transfer electrons and have full opposite charges.

• Neither -- they will share electrons equally and have no partial changes.

• Hydrogen because it is more electronegative.

• Flourine because it is more electronegative.

Tags

NGSS.HS-PS1-1

Atoms that contain the same # of protons but a different number of neutrons are called

(choose the BEST, most specific answer)

• ions.

• isotopes.

• atoms.

• elements.