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3 years ago

Explain why the melting point of calcium is high?

Chemistry

2 answers:

DanielleElmas [232]3 years ago

5 0

It takes more energy to breakdown the bonds

Assoli18 [71]3 years ago

3 0

Calcium has a high melting point which is about 842°C.

This is coz Calcium atoms have smaller radii since they have also a greater nuclear charge.

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Identify the factors that govern the speed and direction of a reaction. Check all that apply.

Fiesta28 [93]

Answer: option B and option C

Explanation:

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3 years ago

Determine el porcentaje masa volumen de una solucion compuesta de 150g de etanol y 20g de agua cuyo volumen total es de 165ml

drek231 [11]

Answer:

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3 years ago

What volume (mL) of the partially neutralized stomach acid was neutralized by NaOH during the titration? (portion of 25.00 mL sa

almond37 [142]

The question is incomplete, here is the complete question:

What volume (mL) of the partially neutralized stomach acid having concentration 2 M was neutralized by 0.1 M NaOH during the titration? (portion of 25.00 mL NaOH sample was used; this was the HCl remaining after the antacid tablet did it's job)

<u>Answer:</u> The volume of HCl neutralized is 1.25 mL

<u>Explanation:</u>

To calculate the volume of acid, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of stomach acid which is HCl

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=2M\\V_1=?mL\\n_2=1\\M_2=0.1M\\V_2=25mL$

Putting values in above equation, we get:

$1\times 2\times V_1=1\times 0.1\times 25\\\\V_1=\frac{1\times 0.1\times 25}{1\times 2}=1.25mL$

Hence, the volume of HCl neutralized is 1.25 mL

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3 years ago

The theory of evolution is opposed by the _____Law of Thermodynamics.

NNADVOKAT [17]

Answer:

2nd

Explanation:

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3 years ago

If a balloon contains 3.00 L of air that has a pressure of 36.74 psi, what is the gas volume (the volume of the balloon) once it

Troyanec [42]

Answer:

7.5 L

Explanation:

At constant temperature and number of moles, Using Boyle's law

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

Given ,

V₁ = 3.00 L

V₂ = ?

P₁ = 36.74 psi = 2.5 atm (Conversion factor, 1 psi = 0.068046 atm)

P₂ = 1 atm (Atmospheric pressure as it comes to surface)

Using above equation as:

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

${2.5\ atm}\times {3.00\ L}={1\ atm}\times {V_2}$

${V_2}=\frac{{2.5}\times {3.00}}{1}\ L$

${V_2}=7.5\ L$

6 0

3 years ago