CHEMISTRY HIGH SCHOOL

What happens to the blood which reaches the cells from the capillaries?food and CO2 pass to cells, O2 pass to blood
wastes and CO2 pass to cells, O2 pass to blood
CO2 and O2 pass to cells, wastes pass to blood
food and O2 pass to cells, CO2 and wastes pass to blood

Answers

Answer 1
Answer:

The blood the reaches the cells from the capillaries food and O2 pass to cells, CO2 and wastes pass to blood. The rest of the choices do not answer the question above.
Answer 2
Answer:

Answer:

food and O2 pass to cells, CO2 and wastes pass to blood.

Explanation:

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Why are lichens a good pioneer species after a volcanic eruption

Answers

They are able to grow on bare rock


Love Expiant~
They are able to grow on bare rock. 

Which molecule is amphoteric?A.
NH4+

B.
H2O

C.
H2CO3−

D.
H2SO4

Answers

Answer:

The answer is B

Explanation:

Answer:

B. H2O

Explanation:

Well, for one example, we know that water is amphoteric... Examples: H2O can become H3O+ or OH-. HCO3- can become CO3^2- or H2CO3

Please answer these questions it is simple and easy every one look

Answers

I think that the ants would prefer honey and maple syrup - as they're full of sugars that the ants can convert to energy.

I think that the ants would also locate the source of the food very fast and that they would go there directly -as if they were telling each other where the food is. And it is true, the ants can tell the other ants to follow them in the source of food, similarly to bees.

A stream of negatively charged particles is called:

Answers

Cathode rays are a stream of negatively charged particles or electrons in vacuum tubes. They were first seen by Johann Hittorf in 1869. They are named since they are emitted by electrode or cathode. In order to release the electrons, the electrons should first be detached from the atoms of the cathode.

If a catalyst is used in a reaction:a. the energy of activation increases.
b. the reaction rate does not change.
c. the reaction rate increases.
d. the equilibrium shifts.

Answers

the purpose of catalyst is to speed up so it increases the rate of rxn and lower the activation energy

The half-life of radioactive substance is 2.5 minutes. what fraction of the origional radioactive remains after 10 mins

Answers

The answer is 1/16.

Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. (1/2)^(n) = x,
where:
n - a number of half-lives
x - a remained fraction of a sample

2. t_(1/2) = (t)/(n)
where:
t_(1/2) - half-life
t - total time elapsed
n - a number of half-lives

So, we know:
t = 10 min
t_(1/2) = 2.5 min

We need:
n = ?
x = ?

We could first use the second equation to calculate n:
If:
t_(1/2) = (t)/(n),
Then: 
n = (t)/( t_(1/2) )
⇒ n = (10 min)/(2.5 min)
⇒ n=4

Now we can use the first equation to calculate the remained fraction of the sample.
(1/2)^(n) = x
⇒ x=(1/2)^4
⇒x= (1)/(16)
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