Biology 1 Ch 1-3 1st Sem. test

Front

What property of a water molecule allows hydrogen bonds to form among adjacent molecules?

Back

The polarity of the molecule, which involves a slightly negative oxygen atom and slightly positive hydrogen atoms.

Front

What allows the three atoms in a water molecule to stay together?

Back

Covalent bonds formed by shared electrons between atoms.

Front

In a chemical reaction, which event ALWAYS occurs as the reaction proceeds?

Back

The rearrangement of electrons to break or form chemical bonds.

Front

What group is used to compare the effects of the independent variable since this group is exposed to the same conditions besides the independent variable?

Back

Control Group.

Front

A logical interpretation of an observation is...

Back

An inference.

Front

Define covalent bond.

Back

A chemical bond formed by the sharing of electrons between atoms.

Front

What is the role of a control group in an experiment?

Back

To provide a baseline for comparison against the experimental group.

Front

What is an inference in scientific terms?

Back

A conclusion drawn from observations and prior knowledge.

Front

Explain the concept of polarity in molecules.

Back

Polarity refers to the distribution of electrical charge over the atoms joined by the bond, leading to a molecule having a positive and a negative end.

Front

What is the difference between an ionic bond and a covalent bond?

Back

An ionic bond involves the transfer of electrons, while a covalent bond involves the sharing of electrons.