When sugar is added to water, the sugar dissolves and the resulting liquid is clear. Do the sugar and water form a pure substance, or do they form a mixture? Explain your answer.

When sugar is added to water, the sugar dissolves and the resulting liquid is clear. Have the combined sugar and water formed a pure substance or a mixture? Explain your answer.

For each pair of terms, explain how the meanings of the terms differ. plasmolysis and cytolysis

You place two cans of regular soda and two cans of diet soda in a container full of water. The two regular cans sink, but the two diet cans float. Research the contents of regular soda and dict soda. Then make a conjecture about why the diet cans float, but the regular cans sink. Include a discussion of density and buoyancy in your explanation.

New substances are always formed when matter undergoes a a. change in shape. b. physical change. c. change in temperature. d. chemical change .

Sweating is an evaporation process that _____ the body.

A. cools

B. heats

C. has no effect on

D. dries the body

The tendency of molecules of the same kind to stick together is called ______.

Why is water considered a polar molecule? $\\$ A) The oxygen atom is found between the two hydrogen atoms.$

$$B) Both hydrogen atoms are at one end of the molecule, and the oxygen atom is at the other end.$$

$$C) The oxygen atom attracts the hydrogen atoms.$$

$ D) The oxygen end of the molecule has a slight negative charge, and the hydrogen end has a slight positive charge.

Fill in the blanks

The hydrogen atoms of a water molecule are bonded to the oxygen atom by ________ bonds, whereas neighboring water molecules are held together by ________ bonds.

a. polar covalent; ionic

b. ionic; covalent

c. polar covalent; hydrogen

d. hydrogen; polar covalent

A single water molecule is held together by?

A. covalent bonds $\\$ B. hydrogen bonds$

$$C. ionic bonds$$

$ D. polar bonds

Applying Concepts A light green powder is heated in a test tube. A gas is given off while the solid becomes black. What type of change is occurring? Explain your reasoning.

Why shouldn't fruits be washed before you store them?

If a neutral atom loses one electron, what is the electrical charge of the atom?