Answer:
In homeothermic (“warm-blooded”) animals, body temperature is carefully
regulated. The hypothalamus, located in the brain, acts as the master ther-
mostat to keep body temperature constant to within a fraction of a degree
Celsius in a healthy animal. If the body temperature starts to deviate much
from the desired constant level, the hypothalamus causes changes in blood
flow and initiates other processes, such as shivering or perspiration, to bring
the temperature back to normal. What evolutionary advantage does a con-
stant body temperature give the homeotherms (e.g., birds and mammals)
over the poikilotherms (e.g., reptiles and insects), whose body temperatures
are not kept constant? What are the disadvantages?
Explanation: Basic chemical understanding as revealed upwards
Answer:
Explanation:
Your strategy here will be to
use the chemical formula of carbon dioxide to find the number of molecules of
CO
2
that would contain that many atoms of oxygen
use Avogadro's constant to convert the number of molecules to moles of carbon dioxide
use the molar mass of carbon dioxide to convert the moles to grams
So, you know that one molecule of carbon dioxide contains
one atom of carbon,
1
×
C
two atoms of oxygen,
2
×
O
This means that the given number of atoms of oxygen would correspond to
4.8
⋅
10
22
atoms O
⋅
1 molecule CO
2
2
atoms O
=
2.4
⋅
10
22
molecules CO
2
Now, one mole of any molecular substance contains exactly
6.022
⋅
10
22
molecules of that substance -- this is known as Avogadro's constant.
In your case, the sample of carbon dioxide molecules contains
2.4
⋅
10
22
molecules CO
2
⋅
1 mole CO
2
6.022
⋅
10
23
molecules CO
2
=
0.03985 moles CO
2
Finally, carbon dioxide has a molar mass of
44.01 g mol
−
1
, which means that your sample will have a mass of
0.03985
moles CO
2
⋅
44.01 g
1
mole CO
2
=
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
∣
∣
a
a
1.8 g
a
a
∣
∣
−−−−−−−−−
The answer is rounded to two sig figs, the number of sig figs you have for the number of atoms of oxygen present in the sample.
Answer:
a
Explanation:
ADAPTATIOnn but if thhere would be an option o all the above it would be that
Sr3(PO4)2 is definitely Ionic
