| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
Elements in the same group in the Periodic Table of the Elements have the same:
number of electron shells |
|
number of atomic mass units |
|
number of electrons in their outer electron shell |
|
number of electrons |
The columns of the Periodic Table are called groups and all elements in a group have the same number of electrons in their outer electron shell. The group that an element occupies generally determines its chemical properties as the number of outer shell electrons establishes the way it reacts with other elements to form molecules. So, because each element has the same number of electrons in its outer shell, each has similar reactivity.
__________ is caused by a lack of Vitamin C.
scurvy |
|
diabetes |
|
shingles |
|
anemia |
Scurvy is a difficiency disease caused by a lack of Vitamin C in the diet.
__________ and __________ pair to strengthen bones.
iron, calcium |
|
vitamin D, magnesium |
|
calcium, vitamin A |
|
vitamin D, calcium |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
|
kinetic energy |
|
a force |
|
work |
Force is applied to change an object's speed or direction of motion.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
|
refraction |
|
sound radiation |
|
Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.