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3 years ago

Why does your heart rate increase while exercising?

Chemistry

2 answers:

labwork [276]3 years ago

8 0

Answer:

I'd myself say it's because a lot of people are fat but here's the real answer ;)

During exercise, your body may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. During exercise, your heart typically beats faster so that more blood gets out to your body.

kow [346]3 years ago

3 0

Answer:

You might be interested in

Ethanol is added to gasoline because the oxygen it contains improves gasoline's burning efficiency. Its combustion reaction is g

Angelina_Jolie [31]

Answer:

A) Exothermic

B) (1) -410.5 kJ (2) -98.1 kcal

C) -976.44 kJ

Explanation:

A) By the value of ΔH (-1236 kJ), we can see that it's negative, it means that the heat is being lost by the reaction, and, because of that, the reaction is exothermic.

B) The molar mass of ethanol is 46.07 g/mol, so, at 15.3 grams, the number of moles is:

n = mass/molar mass

n = 15.3/46.07

n = 0.3321 mol

By the equation

1 mol of ethanol ----------------------- -1236 kJ

0.3321 mol of ethanol ----------------------- x

By a simple direct three rule:

x = -410.5 kJ

1 kJ --------------- 0.2390 kcal

-410 kJ ---------- y

y = -98.10 kcal

C) The molar mass of water is 18 g/mol, so the number of moles at 42.7 g is:

n = 42.7/18

n = 2.37 moles

By the equation

3 moles of water ----------------------- -1236 kJ

2.37 moles of water --------------------- x

By a simple direct three rule:

3x = -2929.32

x = -976.44 kJ

5 0

3 years ago

The formation of protons over neutrons (thus producing about a 7:1 ratio) was favored in the early universe because:____.

tatiyna

Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.

To find the answer, we need to know more about the early universe.

<h3>How the formation of proton over neutrons was favored in the early universe?</h3>

A neutron is produced with greater energy than a proton.
However, later on, some of the protons were changed into neutrons.
Contrary to some claims, the proton is a stable particle that never decays, but the neutron is unstable outside of the nucleus and decays with a half life of around 10.5 minutes.
However, very few would have had time to decay on the timeline you mention in your question.
Every matter particle should have been accompanied by an antimatter particle, and every proton, neutron, and electron, by an anti-neutron and a positron, respectively.
Where did all the antimatter go is the great mystery. There have been a few attempts to explain this, but they have failed.

Thus, we can conclude that, the correct answer is option b.

Learn more about the early universe here:

brainly.com/question/28130096

#SPJ1

7 0

1 year ago

In order to get lots of helium into tanks to fill kiddy balloons, they put force or pressure onto it. If i have 595 liters of he

alexandr402 [8]

Answer:

1.90 L

Explanation:

Using Boyle's law

${P_1}\times {V_1}={P_2}\times {V_2}$

Given ,

V₁ = 595 L

V₂ = ?

P₁ = 1.00 atm

P₂ = 55.0 atm

Using above equation as:

${P_1}\times {V_1}={P_2}\times {V_2}$

${1.00}\times {595}={55.0}\times {V_2}$

${V_2}=\frac{{1.00}\times {595}}{55.0}\ L$

${V_2}=1.90\ L$

<u>The volume would be 1.90 L.</u>

5 0

3 years ago

There are several differences between chemical and physical changes. Which process is a sign of a chemical change? A. Rotting po

Nataly [62]

Answer:

A. a rotten potato gives all of bad smell

Explanation:

B,C,D are all physical changes because we can reverse them back.we can cool the water back to make ice. if the wind passes again we can randomly get the same cloud shape in c. and in d we can make that statue again. but in A can we reverse the rotting process ? ( the enzyme reaction) no we cant because it is a chemical reaction it gives a bad smell because of the chemical changes occuring in it.

hope this helps

8 0

2 years ago

Atoms bond due to the interactions between

Free_Kalibri [48]

The answer would be 2 in ths case, bonding has to do with the electron orbitals.

3 0

3 years ago