CHEMISTRY HIGH SCHOOL

1 Iron can be extracted from iron(III) oxide using carbon, shown by the equation below:Fe²O³ + C -> Fe + CO
Balance the equation and state which substance is oxidised and which is reduced​

Answers

Answer 1
Answer:

Explanation:

To balance the chemical equation for the extraction of iron from iron(III) oxide using carbon, you need to ensure that the same number of each type of atom appears on both sides of the equation. Here's the balanced equation:

2Fe₂O₃ + 3C -> 4Fe + 3CO

Now, let's determine which substance is oxidized and which is reduced:

1. Iron (Fe) undergoes a change in oxidation state from +3 in iron(III) oxide (Fe₂O₃) to 0 in elemental iron (Fe). It is reduced because it gains electrons, going from a higher positive oxidation state to zero.

2. Carbon (C) in carbon (C) undergoes a change in oxidation state from 0 to +2 in carbon monoxide (CO). Carbon is oxidized because it loses electrons and goes from an oxidation state of 0 to +2.

So, in this chemical reaction:

- Iron is reduced (it gains electrons).

- Carbon is oxidized (it loses electrons).

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Give the significant figures of 0.011cm
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A solute is a mixture in which particles can be seen and easily separated. Please select the best answer from the choices provided T F
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What is the molarity of 1.5 liters of an aqueous solution that contains 52 grams of lithium fluoride, LiF, (gram-formula mass = 26 grams/mole)?

Answers

Molarity is simply the number of moles dissolved per liter of solution.
Converting the mass of LiF to moles:
52 g / 26 g/mol = 2 mol LiF

Next, simply divide the number of mole by the volume
2 mol / 1.5 L = 1.3333 mole/L

So, the molarity of the given solution is 1.3333 M

What is the percentage of water to the nearest tenth in this compound? Ba(OH)2 * 8H2O

Answers

mass of water: 8 * 18 g = 144 g
mass of Ba(OH)2 = 171.3 g

total mass: 144 g + 171.3 g =  315.3 g

percentage of water: (144 g / 315.3 g) * 100% = 45.67%

Which bond pair does not have a polar covalent bond?A. P – Cl



B. O – H



C. S – Cl



D. H – Cl



E. Cl – Cl

Answers

The answer is E. Cl -- Cl

Chloride, Cl2, has a non-polar covalent bond because both molecules making up the compound are identical. This results to a diatomic molecule, which are known non-polar molecules. Since both sides of the bond are also the same, there is equal sharing of electrons. Polar covalent bonds are those that have unequal sharing of electrons.

In chemical reactions, atoms area. created.
c. rearranged.
b. destroyed.
d. neutralized.

Answers

In chemical reaction, atomsalways are rearranged. They are never destroyed or created because it wouldcontradict the law of conservation of energy. The law of conservation of energystates that a matter cannot be created nor destroyed. It can only be formed inone way or the other. Also it cannot be neutralized. Resulting in one cannot bepart of a chemical reaction. An example of this is the reaction HCl + NaOH-> NaCl + H2O. the reactants and products are not created, they are justformed into another substance.

Final answer:

In chemical reactions, atoms are rearranged to form new substances.

Explanation:

In chemical reactions, atoms are rearranged.

Atoms are the fundamental building blocks of matter, and they cannot be created or destroyed in a chemical reaction. Instead, the atoms that make up the reactants rearrange themselves to form the products of the reaction.

For example, in the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O), the atoms in the hydrogen and oxygen gases rearrange to form the water molecules. Thus we can correctly predict the arrangement of atoms as described above.

Learn more about Atoms here:

brainly.com/question/30735712

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Mendeleev saw trends in the physical and chemical properties of elements when he organized them by _____.atomic number

physical properties

atomic weight

density

Answers

Answer:

atomic weight

Explanation:

Mendeleev realised that the physical and chemical properties of elements were related to their atomic weight

hope it helps4

Precipitation _____. occurs equally all over the globe is the change in state from a gas to a liquid happens when ice changes into water vapor exceeds evaporation over land

Answers

Answer;

exceeds evaporation over land

Precipitation exceeds evaporation over land

Explanation;

  • In order to maintain earths water balance, evaporation exceeds precipitation over oceans but precipitation exceeds evaporation over land.
  • Water evaporates into the atmosphere from the ocean and to a much lesser extent from the continents. Winds transport this moisture-laden air, often great distances, until conditions cause the moisture to condense into clouds and to precipitate and fall.
  • Most precipitation originates by evaporation from the oceans. Over time, water evaporated from the oceans is replenished by inflow of freshwater from rivers and streams.
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