| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.70 |
| Score | 0% | 74% |
Changes to an object's speed or direction of motion are caused by which of the following?
power |
|
a force |
|
work |
|
kinetic energy |
Force is applied to change an object's speed or direction of motion.
Which of the following substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
ion |
|
base |
|
acid |
|
hydrogen |
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.
Which of these is important for the body's maintenance, growth, and repair?
protein |
|
carbohydrates |
|
fiber |
|
fats |
Found in both animal sources (meat, fish, eggs, cheese) and vegetables (beans, nuts, some grains), proteins are important for the body's maintenance, growth, and repair.
Carbohydrates are found in:
vegetable oils |
|
food additives |
|
sugars and starches |
|
animal sources |
Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
element |
|
molecule |
|
atom |
|
compound |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.