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3 years ago

Identify each element below, and give the symbols of the other elements in its group:

Chemistry

1 answer:

nikdorinn [45]3 years ago

3 0

Answer:

In explanation

Explanation:

a. Selenium, atomic number 34

Argon is 18, adding the other electrons gives 34.

Other elements include: oxygen O , Sulphur S , Tellurium Te and Polonium Po

b. Hafnium, element 72

Xe is 54, adding the other electrons makes the total 72.

Other elements; Titanium Ti, Zirconium Zr, Rutherfordium Rf

c. Manganese, element 25

Other group members are Technetium Tc , Rhenium Re and Bohrium Bo

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Leviafan [203]

Answer:

The unknown NaOH base has a concentration of 0.636M

Explanation:

Step 1: the balanced equation

NaOH + HCl → NaCl + H2O

This means for 1 mole of NaOH consumed there is 1 mole of HCl needed to produce 1 mole of NaCl and 1 mole of H2O

Step 2: Calculate moles of HCl used

Number of moles = Concentration * volume = 0.5M * 25*10^-3 L =0.0125 moles

Step 3: Calculate moles of NaOH

Since the mole ratio for HCl and NaOH is 1:1 this means we have 0.0125 moles of NaOH for 0.0125 moles of HCl

Step 4: Calculate Concentration of the unknown NaOH base

Concentration = Number of moles / Volume

Volume of NaOH = 24.64-5 =19.64 mL = 0.01964 L

Concentration = 0.0125/0.01964 = 0.636 M

The unknown NaOH base has a concentration of 0.636M

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3 years ago

Magnesium and nitrogen react to form magnesium nitrate. Which of the following expressions represents this chemical reaction?

Leona [35]

Magnesium + Nitrogen ➡ Magnesium Nitrate

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3 years ago

Assign oxidation numbers to the element in each of the following compounds. Remember an oxidation number is for one atom of the

worty [1.4K]

Answer:

a. x = + 2

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c. x = + 2

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The oxidation number is a formal charge assigned to an atom present in a molecule or formula unit or ion based on some arbitrary rules.

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The oxidation number of Hg in HgO is:

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The oxidation number of Al in Al₄C₃ is:

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2 years ago

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Answer:

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