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3 years ago

An atom of any element must contain

2 answers:

5 0

An atom (which by definition is neutral) should have (2) an equal number of protons and electrons.
If the number of protons and electrons are not equal, it becomes an ion.The number of protons and neutrons can vary widely depending on what the substance is and depending on the isotopes.

svetlana [45]3 years ago

4 0

An atom of any element must contain "(2) an equal number of protons and electrons" but it should be noted that atoms can borrow electrons from one another.

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7.66 Write balanced equations for the following reactions: (a) potassium oxide with water, (b) diphosphorus trioxide with water,

White raven [17]

Explanation:

(a) potassium oxide with water

$K_2O(s)+H_2O(l)\rightarrow 2KOH(aq)$

According to reaction,1 mole of potassium oxide reacts with 1 mole of water to give 1 mole of potassium hydroxide.

(b) diphosphorus trioxide with water

$P_2O_3(s)+3H_2O(l)\rightarrow 2H_3PO_3(aq)$

According to reaction,1 mole of diphosphorus trioxide reacts with 2 moles of water to give 2 moles of phosphorus acid.

(c) chromium(III) oxide with dilute hydrochloric acid,

$Cr_2O_3(s)+6HCl(aq)\rightarrow 2CrCl_3(aq)+3H_2O(l)$

According to reaction,1 mole of chromium(III) oxide reacts with 6 moles of hydrochloric acid to give 2 moles of chromium(III) chloride and 3 moles of water.

(d) selenium dioxide with aqueous potassium hydroxide

$SeO_2 (s)+2KOH (aq)\rightarrow K_2SeO_3(aq)+H_2O(l)$

According to reaction,1 mole of selenium dioxide reacts with 2 moles of potassium hydroxide to give 1 mole of potassium selenite and 1 mole of water.

6 0

3 years ago

A sample of a compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen. What is the empirical formula of this

Shtirlitz [24]

Answer:

The empirical formula is CH2O, and the molecular formula is some multiple of this

Explanation:

In 100 g of the unknown, there are 40.0⋅g12.011⋅g⋅mol−1 C; 6.7⋅g1.00794⋅g⋅mol−1 H; and 53.5⋅g16.00⋅g⋅mol−1 O.

We divide thru to get, C:H:O = 3.33:6.65:3.34. When we divide each elemental ratio by the LOWEST number, we get an empirical formula of CH2O, i.e. near enough to WHOLE numbers. Now the molecular formula is always a multiple of the empirical formula; i.e. (EF)n=MF.So 60.0⋅g⋅mol−1=n×(12.011+2×1.00794+16.00)g⋅mol−1.Clearly n=2, and the molecular formula is 2×(CH2O) = CxHyOz.

5 0

1 year ago

How can these objects all weigh the same but be different sizes?

Mrrafil [7]

Density/Earth’s gravitational pull.

5 0

2 years ago

In a typical reaction, as time passes, the amount of _____ decreases and the amount of _____ increases. Fill in the blank

ELEN [110]

Reactants, products are the answers

8 0

3 years ago

Climatology is a subspecialty of

rodikova [14]

Climatology is a subspecialty of a Climate and for how the climate changes. This is averaged out from over a set of a period of time.

I hope this helps! ;D

7 0

3 years ago