Answer:
Because you need energy.
Explanation:
When you eat carbs before any event that consists of running or any other activities, the carbs will fuel you up. Carbohydrates give you energy for a long period of time.
Answer:
There are many types of matter because one thing or substance can change its structure depending on its environment such as how much pressure it's under and what kind of temperature surrounds it.
Answer:
Volume= 4 cm³
Density= 2 g/cm³
Explanation:
We have the following data:
volume= V= 8 cm³
mass= m= 16 g
The density is the mass per volume of a substance, so the density of the rock is:
density= d= 16 g/8 cm³= 2 g/cm³
When we cut the rock in half, we have a half volume and a half mass:
V= 8 cm³/2= 4 cm³
m= 16 g/2= 8 g
But the density is not altered because it is an intrisic property - it does not change with the amount of subtance. Thus, the density of a half rock is:
d = m/V= 8 g/4 cm³= 2 g/cm³
True, reddish-yellowish color on pH paper shows acidity
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