CHEMISTRY HIGH SCHOOL

_____ is the element from which iron is taken.

Carbon
Quartz
Hematite

Answers

Answer 1
Answer: Hematite is the element
Answer 2
Answer: Answer:

Hematite is the element from which iron is taken.

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What is the empirical formula of a compound containing 24.56% potassium, 34.81% manganese, and 40.50% oxygen?

Which of the following notations is the correct noble gas configuration for Li

Answers

Noble gas configuration for Li : [He]2s¹

Further explanation

In an atom, there are levels of energy in the shell and sub-shell

This energy level is expressed in the form of electron configurations.

Lithium with atomic number 3, then the electron configuration:

1s²2s¹

And for noble gas configuration or it can be called Condensed electron configurations :

[He]2s¹

Answer:

[He]2s¹

Explanation:

On a hot summer day Lam walked home from his grandmothers with a chocolate bar in his pocket. When he arrived home the chocolate bar had melted in his pocket, which statement BEST explains why thechocolate bar melted?
A Heat transferred from the chocolate bar to his pocket.
B. Heat evaporated from his pocket to his chocolate bar.
c. Heat condensed from his leg to his chocolate bar in his pocket.
D. Heat transferred from the environment to the chocolate bar in his pocket.

Answers

Answer:

d

Explanation:

because it was in a hot environment your pocket

The formula for glycine is NH2CHCOOH. What kind of molecule is glycine? How can you tell?

Answers

Glycine is an amino acid. It contains a carboxyl group (COOH) and an amine group (NH2), with a side R group (CH)

Given the balanced equation representing a reaction:C3H8(g) + 5O2(g)==>3CO2(g) + 4H2O(g)
What is the total number of moles of O2(g) required for the complete combustion of 1.5 moles of C3H8(g)?
(1) 0.30 mol (3) 4.5 mol
(2) 1.5 mol (4) 7.5 mol

Answers

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The moles of oxygen required is 7.5 mol.

What is stoichiometry?

Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.

The balanced equation is

C_3H_8(g) + 5O_2(g)\rightarrow3CO_2(g) + 4H_2O(g)

The mole ratio of C_3H_8 to oxygen is 1:5, means 1 mole of C_3H_8 will react with 5 mole of oxygen. So, if we take 1.5 moles of  C_3H_8 then the amount of oxygen that will be produced will be 5 times the moles of

C_3H_8. The moles of oxygen required to react with 1.5 moles of C_3H_8= 5× 1.5mol.  Moles of oxygen required to react with 1.5 moles of C_3H_8=7.5 mol.

Therefore the moles of oxygen required is 7.5 mol.

To know more about stoichiometry, here:

brainly.com/question/14935523

#SPJ2
The answer is (4) 7.5 mol. The consuming of reactants has the same ratio as the balanced equation. So the ratio of consuming C3H8 and O2 is equal to 1:5. So when 1.5 mol of C3H8 consumed, 1.5*5=7.5 mol O2 consumed.

How many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?

Answers

2 H₂ + O₂=  2 H₂O 

2 moles H₂ ------- 1 mole O₂
27.4 moles H₂ ---- ?

27.4 * 1 / 2 = 

=  27.4 / 2

= 13.7 moles of O₂

hope this helps!

During a flame test, ions of a specific metal are heated in the flame of agas burner. A characteristic color of light is emitted by these ions inthe flame when the electrons(1) gain energy as they return to lower energy levels(2) gain energy as they move to higher energy levels(3) emit energy as they return to lower energy levels(4) emit energy as they move to higher energy levels

Answers

The flames being emitted by the ions are as a result of ions 3. emitting  energy as they return to lower energy levels.

When ions are heated:

  • They absorb energy
  • They are able to move around

As they move around, they expend some of that energy and lose it as a result thereby returning to lower energy levels. As that energy is lost, it comes across as light being emitted by the ions.

In conclusion, ions in the flame test emit light as they lose energy and return to a lower energy level.

Find out more at brainly.com/question/6357832.

Answer;

-Emit energy as they return to lower energy levels.

Explanation;

-A characteristic color of light is emitted by these ions in the flame when the electrons emit energy as they return to lower energy levels.

-The metal ions do absorb energy, and the electrons are boosted to higher energy levels, but they emit that energy as they fall to lower levels, and it is the photons of light they are emitting that can be seen.
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