Question

Most matter _______ when heated.


solidifies


condenses


contracts


expands



Matter that has a definite volume and a definite shape is a _________.


plasma


liquid


gas


solid


Why do the noble gases Not form compounds?


Their outer energy levels are completely filled with electrons


They have empty energy levels.


They have no electrons.


They have seven electrons in their outer energy level.


A particle that moves around the nucleus is a(n) _______.


electron


quark


proton


neutron


Atoms of the same element with different numbers or neutrons are called ________.


metals


isotopes


metalloids


radioactive elements



Matter with no definite volume and no definite shape is a _____.


gas


solid


plasma


liquid


Which of the following will speed up the dissolving of a solid solute in water?


heat the solution


grind up the solvent


cool the solution


freeze the solution


Increasing the surface area of a solid ______.


speeds the rate of dissolving


causes the solid to ionize


has no effect on the rate of dissolving


slows the rate of dissolving


How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable?


4


2


8


6

Answer 1

1. Most matter _______ when heated. — expands

2. Matter that has a definite volume and a definite shape is a _________. — solid

3. Why do the noble gases not form compounds? — Their outer energy levels are completely filled with electrons

4. A particle that moves around the nucleus is a(n) _______. — electron

5. Atoms of the same element with different numbers of neutrons are called ________. — isotopes

6. Matter with no definite volume and no definite shape is a _____. — gas

7. Which of the following will speed up the dissolving of a solid solute in water? — heat the solution

8. Increasing the surface area of a solid ______. — speeds the rate of dissolving

9. How many electrons are needed in the outer energy levels of most atoms for the atom to be chemically stable? — 8