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4 years ago

An element has atomic number 12. What is its Valenc? Will it form Cation or Anion? Is it metal or nonmetal?

Chemistry

1 answer:

SVETLANKA909090 [29]4 years ago

3 0

Explanation:

sodium is in 12....

it is non meatal ....

it's Valence is 2.....

There are only two rules for naming simple ions. Rule 1: Cations. Naming the element and adding the word “ion” forms the cation name. So, Na+ is “sodium ion”....

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Natural gas or methane is a fossil fuel. In a plentiful supply of air, it burns to give carbon dioxide and water. Write a balanc

Alex17521 [72]

Answer:

$CH_4 + 2O_2 --> CO_2 + 2H_2O$

Explanation:

The chemical formula for methane is $CH_4$

The chemical formula for oxygen is $O_2$

The chemical formula for carbon dioxide is $CO_2$

The chemical formula for water is $H_2O$

Methane burns in oxygen to give carbon dioxide and water:

$CH_4 + O_2 --> CO_2 + H_2O$

The balanced equation that will ensure an equal number of each atom on the left and right-hand sides of the equation would be:

$CH_4 + 2O_2 --> CO_2 + 2H_2O$

3 0

3 years ago

How do you balance H2+O2 and H2O

scoray [572]

The correct way to balance would be

2H2 + O2 = 2H2O

4 0

4 years ago

When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bo

weeeeeb [17]

The balanced equation :

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

You just have to look for which element is in bold because the question is not clear

<h3>Further explanation</h3>

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction

Al + Fe₃O₄→ Al₂O₃ + Fe

give a coefficient

aAl + Fe₃O₄→ bAl₂O₃ + cFe

O, left=4, right=3b⇒3b=4⇒b=4/3

Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3

Fe, left=3, right=c⇒c=3

The equation becomes :

8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3

8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe

7 0

3 years ago

52.1 mL of aqueous 0.255 M Pb(NO3)2 is mixed with 38.5 mL of 0.415 M NaCl. The equation for the precipitate reaction is: Pb(NO3)

Elan Coil [88]

Answer:

0.0585 M

Explanation:

Pb(NO₃)₂ (aq) + 2NaCl (aq) → PbCl₂ (s) + 2NaNO₃ (aq)

First we calculate the inital number of moles of each reagent, using the given volumes and concentrations:

0.255 M Pb(NO₃)₂ * 52.1 mL = 13.3 mmol Pb(NO₃)₂

0.415 M NaCl * 38.5 mL = 16.0 mmol NaCl

Then we calculate how many Pb(NO₃)₂ moles reacted with 16.0 mmoles of NaCl, using the stoichiometric coefficients of the reaction:

16.0 mmol NaCl * $\frac{1mmolPb(NO_3)_2}{2mmolNaCl}$ = 8.00 mmol Pb(NO₃)₂

Now we calculate the remaining number of Pb(NO₃)₂ moles after the reaction:

13.3 mmol - 8.00 mmol = 5.30 mmol Pb(NO₃)₂

Finally we divide the number of moles by the final volume to calculate the concentration:

5.30 mmol / (52.1 mL + 38.5 mL) = 0.0585 M

6 0

3 years ago

the grams of carbohydrate in one apple if the apple has no fat and no protein and provides 72 kcal of energy

sergeinik [125]

Carbohydrates have 4 kcal per gram of carbohydrates. (Protein is also 4 kcal/gram, while fat is 9 kcal/gram). Take the total kcal and divide by 4 kcal/gram: 72 kcal/(4 kcal/gram) = 18 grams carbohydrates.

5 0

3 years ago