Answer:
a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
"chlorine acts as a catalyst promoting the breakdown of ozone"
Explanation:
your welcome!
Work is labor and energy is useful for it because you need energy to work unless you will be tired
C. the number of protons and neutrons an element has in its nucleus
Answer:
Looking for certain physical properties.
Explanation:
These properties include color, size, mass, luster, etc.
Weighing the item is a common way to find one physical property, mass.
<span>a. True
The body's pH level is critical to the functioning of the bodies cells. A pH in the range of 7.35 to 7.45 is considered "normal", although a large number of doctors get nervous if the pH is towards the outer edges of that range. If your pH gets down to 6.9, you'll be a coma. At 6.8, you're dead. And if the pH goes up to 7.8, you're also dead.</span>