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ivann1987 [24]
3 years ago
11

Which of the following is a single replacement reaction?

Chemistry
2 answers:
vivado [14]3 years ago
7 0

Answer:

The correct answer is D) Fe + 3NaBr → FeBr3 + 3Na

Explanation:

IrinaK [193]3 years ago
6 0

Answer:

Fe + 3NaBr    →   FeBr₃ + 3Na

Explanation:

Single replacement:

It is the reaction in which one elements replace the other element in compound.

AB + C → AC + B

Chemical equation:

Fe + 3NaBr    →   FeBr₃ + 3Na

This chemical equation shows the single replacement reaction. Iron replace the sodium and react with bromine.

All other options are incorrect because,

Ca(OH)₂ + H₂SO₄      →     CaSO₄  + 2H₂O

It is double replacement reaction.

CH₄ + 2O₂     →     CO₂  + 2H₂O

This reaction equation shows combustion.

H₂O + CO₂  →    H₂CO₃

This is synthesis reaction.

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Can someone help me check my answers for the mole questions?
Sliva [168]

Answer:

Explanation:

Given data:

Number of particles of phosphorous = 1.2 × 10²⁵

Number of moles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

Number of particles of phosphorous = 1.2 × 10²⁵ particles

1 mole = 6.022 × 10²³ particles

1.2 × 10²⁵ particles × 1 mole /  6.022 × 10²³ particles

0.1993  × 10² mol

19.93 mole

Q 3:

Given data:

Number of moles of calcium = 0.630 mol

Number of particles = ?

Solution:

The number 6.022 × 10²³ is called Avogadro number.

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ particles of hydrogen

For 0.63 moles:

1 mole = 6.022 × 10²³ particles

0.63 mol × 6.022 × 10²³ particles  / 1 mol

3.79 × 10²³ particles

Q 4:

Given data:

Number of moles = 4 mol

Number of particles = ?

Solution:

The number 6.022 × 10²³ is called Avogadro number.

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ particles of hydrogen

For 4 moles:

1 mole = 6.022 × 10²³ particles

4 mol × 6.022 × 10²³ particles  / 1 mol

24 × 10²³ particles

2.4  × 10²⁴ particles

3 0
3 years ago
Explain why you cannot just take away a proton to make a halogen negative.​
Ilia_Sergeevich [38]

The force that holds protons and neutrons together is too strong to overcome.

<h3>Explanation</h3>

Consider the location of the particles in an atom.

  • Electrons are found outside the nucleus.
  • Protons and neutrons are found within the nucleus.

Protons carry positive charges and repel each other. The nucleus will break apart without the strong force that holds the protons and neutrons together. This force is much stronger than the attraction between the nucleus and the electrons. X-rays are energetic enough for removing electrons from an atom. However, you'll need a collider to remove protons from a stable nucleus. You could well have ionized the atom with all that energy.

Also, changing the number of protons per nucleus will convert the halogen atom to an atom of a different element. Rather than making the halogen negative, removing a proton will convert the halogen atom to the negative ion of a different element.

6 0
3 years ago
What is the most important alloy that we use in construction?
olya-2409 [2.1K]

Answer:

construction means everything is built from

EXCEPT NATURE

Explanation:

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5 0
2 years ago
Read 2 more answers
The lab procedure you just studied involves
Svetllana [295]

Answer: c , v, c, c, v

Explanation:

8 0
3 years ago
Ribosomes are cell structures that make
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Answer:

Ribosomes preform biological synthesis. (mRNA Translation). They also link amino acids together to form polypeptide chain.

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