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4 years ago

The chief function of muscles is _____. contraction absorption excretion protection

Chemistry

2 answers:

Vilka [71]4 years ago

8 0

Contraction the progress in which a muscle becomes or is made shorter and stronger :))))))))))

denpristay [2]4 years ago

3 0

Answer:

The correct answer is the first option: contraction.

Explanation:

Hello!

Let's solve this!

Muscles are structures or tissues with a main function that is to contract. This happens so that we can perform each of our movements.

They are divided into smooth muscles and skeletal muscles.

We conclude that the correct answer is the first option: contraction.

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What are other ways you can use wind energy to create electricity?

Phantasy [73]

You can use a fan on the wire. That's one way.

8 0

3 years ago

Read 2 more answers

What is the final concentration of the solution produced when 225.5 mL of 0.09988-M solution of Na2CO3 is allowed to evaporate u

ikadub [295]

Explanation:

The given data is as follows.

$V_{1}$ = 225.5 mL, $V_{2}$ = 45.00 mL

$M_{1}$ = 0.09988 M, $M_{2}$ = ?

Therefore, formula to calculate final concentration will be as follows.

$M_{1}V_{1}$ = $M_{2}V_{2}$

Putting the given values into the above formula as follows.

$M_{1}V_{1}$ = $M_{2}V_{2}$

$0.09988 M \times 225.5 mL$ = $M_{2} \times 45.0 mL$

$M_{2}$ = 0.5 M

Thus, we can conclude that the final concentration of the given solution is 0.5 M.

4 0

3 years ago

a 20ml sample of hcl was titrated with the 0.0220 M Naoh. to reach the endpoint required 23.72 mL of the NaOh. Calculate the mol

Y_Kistochka [10]

Answer:

Molarity of HCl=0.026092M

Explanation:

The equation for the reaction is;

HCl + NaOH ⇒ NaCl + H2O

Using the formular, $\frac{C_{A}V_{A}}{C_{B}V_{B} }=\frac{nA}{nB}$ ..........equ1

where $C_{A}$ is the concentration of Acid,

$V_{A}$ is volume of acid

$C_{B}$ is concentration of the base

$V_{B}$ is volume of the base

nA is the number of moles of Acid

nB is number of moles of base

nA = 1, nB=1 , $V_{A}=20ml$ , $C_{B}=0.022M$ , $V_{B}=23.72mL$

we will input these values into equation1 to solve for $C_{A}$

$\frac{C_{A}*20}{0.022*23.72}=\frac{1}{1}$

$C_{A}*20=0.022*23.72$

$C_{A}=0.026092M$

7 0

3 years ago

In a rocket motor fueled with butane, how many kg of liquid oxygen should be provided with each kilogram of butane to provide fo

Travka [436]

Answer

So this is the reaction that happens.
C4H10 + O2 = CO2 + H2O 

Balanced, it is 
2C4H10 + 8O2 = 8CO2 + 10H2O 

Given 1 kg or 1000 g of butane, use stoichiometry aka factor labeling aka conversions and mole ratios to get to grams of oxygen. 

I'll do an example. Let's form water. Hydrogen is diatomic too. 
2H2 + O2 = 2H2O 

Given 1000 g of Hydrogen, I need to know how many grams of oxygen to use. To convert grams to moles,
I know that 1 mol of H2 equals 2.02 g. Then, for every mole of O2, there are 2 moles of H2. Then converting moles of O2 to grams, I know that one mole of it equals 32 grams. 
[1000 g H2] x [1 mol H2/2.02 g H2] x [1 mol O2/2 mol H2] x [32 g O2/1 mol O2] 

My answer would be 7.9 kg

3 0

3 years ago

Most acid precipitation results from the combination of _____ with water in the atmosphere, forming strong acids that fall with

aleksley [76]

Answer:

Most acid precipitation results from the combination of Sulfur Oxides and Nitrogen Oxides with water in the atmosphere, forming strong acids that fall with rain or snow.

Explanation:

Acid rain is said to be that rain which contains high concentration of H⁺ ions. The main source of acid rain is the elimination of NOₓ (Nitrogen Oxides) and SOₓ (Sulfur Oxides) from different means in industries and other combustion processes on earth.

Examples:

SO₂ + H₂O → H₂SO₄

NO₂ + OH° → HNO₃

From above examples it can be seen that the sulfur and nitrogen oxides when reacted with water forms strong acids. These acids come along with rain water and causes different problems to living organisms and non living objects like buildings.

4 0

3 years ago