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2 years ago

What are the two different parts of the eggbeater kick? In swimming

Chemistry

1 answer:

Kitty [74]2 years ago

8 0

EGGBEATER KICK: <em>RESTING AND PASSING</em>

There are two phases:

a power stroke and a recovery stroke. The power stroke is the same as the underwater pull on the freestyle stroke and creates power.

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If you blow dry your wet hair is it a physical or a chemical change

Scilla [17]

Its a physical change

5 0

3 years ago

Acetylene burns in air according to the following equation: C2H2(g) + 5 2 O2(g) → 2 CO2(g) + H2O(g) ΔH o rxn = −1255.8 kJ Given

professor190 [17]

Answer: -227 kJ

Explanation:

The balanced chemical reaction is,

$C_2H_2(g)+\frac{5}{2}O_2(g)\rightarrow 2CO_2(g)+H_2O(g)$

The expression for enthalpy change is,

$\Delta H=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]$

$\Delta H=[(n_{CO_2}\times \Delta H_{CO_2})+ n_{H_2O}\times \Delta H_{H_2O})]-[(n_{C_2H_2}\times \Delta H_{C_2H_2})+(n_{O_2}\times \Delta H_{O_2})]$

where,

n = number of moles

$\Delta H_{O_2}=0$ (as heat of formation of substances in their standard state is zero

Now put all the given values in this expression, we get

$-1255.8=[(2\times -393.5)+(1\times -241.8)]-[(1\times \Delta H_{C_2H_2})+(\frac{5}{2}\times 0)]$

$-1255.8=[(-787)+(-241.8)]-[(1\times \Delta H_{C_2H_2})+(0)]$

$\Delta H_{C_2H_2}=-227kJ$

Therefore, the enthalpy change for $C_2H_2$ is -227 kJ.

7 0

3 years ago

Malleability and density are examples of (C?)

I am Lyosha [343]

If I'm not mistaken it's C.

3 0

3 years ago

Read 2 more answers

mole is equal to 6.022x1023 particles/atoms/molecules. how many chloride ions are presented when 1 mole of sodium chloride is mi

krek1111 [17]

When 1 mole of sodium chloride is mixed with 4 mole of magnesium chloride, the number of chloride ion present will be 5.4198 x $10^{24}$ molecules

<h3>Number of molecules in substances</h3>

1 mole of sodium chloride contains 1 mole of chloride ion according to the following equation:

NaCl ---> $Na^+$ + $Cl^-$

4 moles of magnesium chloride will contain moles of chloride ions according to the following equation:

$4MgCl_2 --- > 4Mg^{2+} + 8 Cl^-$

The total number of moles of chloride ions in solution:

1+8 = 9 moles.

1 mole of a substance = 6.022 x $10^{23}$

Thus, the total number of chloride ions present in the mixture = 9 x 6.022 x $10^{23}$

= 5.4198 x $10^{24}$ molecules

More on number of molecules in substances can be found here: brainly.com/question/11907018

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2 years ago

What does the name amino acid tell you about the structure of this molecule?

Nata [24]

Neuropipet compounds Amino acids

4 0

4 years ago