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3 years ago

How does the skeletal and muscular systems work together?

Chemistry

2 answers:

lilavasa [31]3 years ago

8 0

Answer:

B) Tendons connect the skeletal system to the muscular system by attaching muscle to bone.

Explanation:

The muscles of the muscular system attach to bones, pulling on them to allow for movement of the body.

iren2701 [21]3 years ago

3 0

Answer:

answer is B

Explanation:

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How many moles are 5.42 x 1026 atoms of calcium?

MrRissso [65]

Answer: 900.33moles

Explanation:Please see attachment for explanation

7 0

3 years ago

Read 2 more answers

What is the name of Ptsa?

makkiz [27]

Answer:

p- Toluenesulfonic acid

formula:

CH 3 C 6 H 4 SO 3 H

3 0

3 years ago

Please help with these two chemistry questions. Image attached.

mars1129 [50]

The answers for the following questions is answered below.

Therefore the volume of a gas is 22.4 L

Therefore the number of moles of oxygen are 2.37 moles

Explanation:

1. Given:

no of molecules (n) = 6.023 × $10^{23}$

volume of gas at STP conditions (V) =22.4 liters

To solve:

Volume of gas (v)

We know;

$\frac{n}{N_{a} } =\frac{v}{V}$

$\frac{6.023 * 10^{23} }{6.023 * 10^{23} } =\frac{v}{22.4}$

1 × 22.4 = v

v =22.4 L

Therefore the volume of a gas is 22.4 L

2. Given:

volume of oxygen gas (v) = 53 L

Volume of gas at STP conditions (V) =22.4 L

To solve:

no of moles of oxygen gas

We know;

$n =\frac{v}{V}$

n = $\frac{53}{22.4}$

n =2.37 moles

Therefore the number of moles of oxygen are 2.37 moles

6 0

3 years ago

Which of the following solutes has the greatest effect on the colligative properties for a given mass of pure water? Explain.

Strike441 [17]

Answer:

Option a.

0.01 mol of CaCl₂ will have the greatest effect on the colligative properties, because it has the biggest i

Explanation:

To determine which of the solute is going to have a greatest effect on colligative properties we have to consider the Van't Hoff factor (i)

These are the colligative properties:

ΔP = P° . Xm . i → Lowering vapor pressure

ΔT = Kb . m . i → Boiling point elevation

ΔT = Kf . m . i → Freezing point depression

π = M . R . T → Osmotic pressure

Van't Hoff factor are the numbers of ions dissolved in the solution. For nonelectrolytes, the i values 1.

CaCl₂ and KNO₃ are two ionic solutes. They dissociate as this:

CaCl₂ → Ca²⁺ + 2Cl⁻

We have 1 mol of Ca²⁺ and 2 chlorides, so 3 moles of ions → i = 3

KNO₃ → K⁺ + NO₃⁻

We have 1 mol of K⁺ and 1 mol of nitrate, so 2 moles of ions → i = 2

Option a, is the best.

8 0

3 years ago

A neutralization reaction between an acid and sodium hydroxide formed water and the salt named sodium sulfate. What was the form

myrzilka [38]

Answer: The formula of the acid that was neutralized is $H_2SO_4$

Explanation:

Neutralization is a chemical reaction in which acid and base combine to form salt and water. Acids donate $H^+$ and bases donate $OH^-$ in water which combine to form water molecules.

As the salt formed is $Na_2SO_4$ , the acid must contain $SO_4$ and thus the acid is $H_2SO_4$

The balanced chemical reaction is ;

$H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O$

The formula of the acid that was neutralized is $H_2SO_4$

3 0

4 years ago