| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.25 |
| Score | 0% | 65% |
Which of the following states of matter exists at the highest temperature?
gas |
|
none of these |
|
liquid |
|
solid |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
acid |
|
solution |
|
base |
|
alkaline |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
Heat is always transferred from __________ to __________ environments.
dense, empty |
|
warmer, cooler |
|
empty, dense |
|
cooler, warmer |
Heat is always transferred from warmer to cooler environments and conduction is the simplest way this transfer can occur. It is accomplished through direct contact between materials and materials like metals that transfer heat efficiently are called conductors while those that conduct heat poorly, such as plastic, are called insulators.
Which of the following is not true about simple magnets?
same poles repel each other |
|
opposite poles attract each other |
|
all of these are untrue |
|
opposite poles repel each other |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.
Which of the following states of matter exists at the lowest temperature?
liquid |
|
gas |
|
solid |
|
none of these |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.