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4 years ago

What does the period number indicate on periodic table

2 answers:

Ber [7]4 years ago

6 0

The period number indicates what electron shell level is being filled. For example, Magnesium is the second element in the third period, which means that there are two electrons in the third shell, assuming that it is neutral.

anastassius [24]4 years ago

4 0

It’s atomic mass is what the number means.

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Which of the following is generally true of female bones in relationship to male bones?

gtnhenbr [62]

What are the options

6 0

3 years ago

Calculate a reasonable amount (mass in g) of your unknown acid to use for a titration. You will want about 30 mL of titrant to g

Vinil7 [7]

Answer:

"0.60 g" is the appropriate solution.

Explanation:

The given values are:

Volume of base,

= 30 ml

Molarity of base,

= 0.05 m

Molar mass of acid,

= 400 g/mol

As we know,

⇒ $Molarity=\frac{Number \ of \ moles \ of \ base}{Number \ of \ solution}$

On substituting the values, we get

⇒ $0.05=\frac{Number \ of \ moles \ of \ base}{30\times 10^{-3}}$

⇒ $Number \ of \ moles \ of \ base=0.05\times 30\times 10^{-3}$

⇒ $=1.5\times 10^{-3}$

hence,

⇒ $Moles \ of \ acid=\frac{Mass \ of \ acid}{Molar \ mass \ of \ acid}$

On substituting the values, we get

⇒ $1.5\times 10^{-3}=\frac{Mass \ of \ acid}{400}$

⇒ $Mass \ of \ acid=1.5\times 10^{-3}\times 400$

⇒ $=0.60 \ g$

8 0

3 years ago

What is the mass of 3.62X10^24 molecules of methanol

Bad White [126]

N(CH₃OH)=3,62·10²⁴/6·10²³ 1/mol = 6,033 mol
m(CH₃OH) = 6,033 mol · 32 g/mol (molar mass) = 193,06 g.

7 0

3 years ago

Read 2 more answers

What is enthalpy?

aleksandrvk [35]

Answer: the heat content of a system at constant pressure.

Explanation:

Enthalpy is defined as the heat content of a system at constant pressure.

It is the heat absorbed or released during a reaction at constant pressure,denoted as ΔH.

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4 years ago

The chemical properties of calcium and strontium are similar because both

Feliz [49]

Answer:

Number of valence electrons

Explanation:

8 0

3 years ago