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4 years ago

The element magnesium and calcium have similar chemical properties.Explain why.

2 answers:

7 0

Magnesium and Calcium are both in Group 2 of the periodic table. This means that they have the same number of electrons on the outer shells. (2)

They have similar properties as elements in the same group has similar properties

Olegator [25]4 years ago

3 0

Answer: This is so because, they have same number of valence electrons.

Explanation:

In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.

Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.

We are given:

Magnesium is the 12th element of the periodic table having electronic configuration $1s^22s^22p^63s^2$

It has 2 valence electrons.

Calcium is the 20th element of the periodic table having electronic configuration $1s^22s^22p^63s^23p^64s^2$

It has 2 valence electrons.

Hence, this is so because, they have same number of valence electrons.

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If 2.76 g of CuNO3 is dissolved in water to make a 0.350 M solution, what is the volume of the solution?

Licemer1 [7]

I can't remember any of the weights of the individual elements but here is how you solve it:
Molecular weight of copper + nitrogen + 3 oxygens = molecular weight of the compound.
M = moles / liter
.350 moles / 1 liter
Do .350 moles / liter x the molecular weight (g / mole) of the compound = the answer in g / L

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3 years ago

_____ is the short-term condition of the atmosphere. A. Climate B. Weather C. Precipitation D. Transpiration

Tomtit [17]

Precipitation is the short-term condition of the atmosphere

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4 years ago

a)Nitrous oxide gas (systematic name: dinitrogen monoxide) is used by some dental practitioners as an anesthetic. Nitrous oxide

Mama L [17]

Explanation:

Nitrous oxide or dinitrogen monoxide can be simple be prepared by the decomposition of ammonium nitrate in the following way -

The reaction is as follows -

NH₄NO₃ ----------------> N₂O + H₂O

This is the unbalanced reaction as was asked in the question , without mentioning the states of matter .

The reaction is carried out in an anhydrous condition ,since , ammonium nitrate can explode on heating .

6 0

4 years ago

Read 2 more answers

Polonium is a rare element with 33 radioisotopes. The most common one, 210Po, has 84 protons and 126 neutrons. When 210Po decays

Fofino [41]

Answer:

Lead Pb

Explanation:

Firstly, we need to know what occurs when a radioisotope emits an alpha particle. An alpha particle is an helium atom. When an isotope emits an alpha particle, it loses an helium atom corresponding to subtracting 4 from its mass number and 2 from its atomic number. This of course coupled with the release of radiation.

Now, we polonium has a proton number of 84 and a mass number of 210. Subtracting 2 and 4 respectively from its proton and mass numbers will yield 82 and 206 proton and mass numbers respectively.

Hence, the decomposition of the Po-210 isotope will yield an element with 82 proton number and 206 mass number. This corresponds to the element Lead.

210Po ——> 206Pb + alpha particle + radiation

6 0

3 years ago

Phosphorus is obtained primarily from ores containing calcium phosphate.

ladessa [460]

Answer:

33.7 kg

Explanation:

Let's consider calcium phosphate Ca₃(PO₄)₂.

The molar mass of Ca₃(PO₄)₂ is 310.18 g/mol and the molar mass of P is 30.97 g/mol. In 1 mole of Ca₃(PO₄)₂ (310.18 g) there are 2 × 30.97 g = 61.94 g of P. The mass of Ca₃(PO₄)₂ that contains 3.57 kg (3.57 × 10³ g) of P is:

3.57 × 10³ g × (310.18 g Ca₃(PO₄)₂/61.94 g P) = 1.79 × 10⁴ g Ca₃(PO₄)₂

A particular ore contains 53.1% calcium phosphate. The mass of the ore that contains 1.79 × 10⁴ g of Ca₃(PO₄)₂ is:

1.79 × 10⁴ g Ca₃(PO₄)₂ × (100 g Ore/ 53.1 g Ca₃(PO₄)₂) = 3.37 × 10⁴ g Ore = 33.7 kg Ore

8 0

3 years ago