The formation of rust is represented by the following reaction: 4Fe + 3O2 → 2Fe2O3 + energyIs this reaction exothermic or endothermic? How do you know?

Answers

Answer 1

Answer:

Answer:

Exothermic

Explanation:

An exothermic reaction is defined as a reaction where heat/energy is released. In the formation of rust, iron reacts with oxygen gas to form ferric oxide and energy. Energy in the products side indicates a release of energy, thus making this reaction exothermic.

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Which best explains why nuclear reactions release more energy than chemical reactions?The forces holding the nucleus together are much stronger than the forces binding electrons to atoms. Protons have a much higher mass and energy than either neutrons or electrons. During a chemical reaction, some of the mass of the reactants is converted to energy. In nuclear reactions, all neutrons are converted to energy.
Which of the following would most likely act as a Bronsted-Lowry acid?
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A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is(1) CH2 (3) C4H8
(2) C4H6 (4) C8H4

Answers

(3) C4H8
C=12, H=1
CH2= 12+2=14
(CH2)n=56g/mol
14n=56
n=4
(CH2)4=C4H8

Answer:

3) C4H8

Explanation:

Castle learning

The hardest known mineral is _____.
topaz
talc
diamond
graphite

Answers

The hardest known mineral is diamond.

Hi there, thanks for asking a question here on Brainly!

The hardest known mineral in this planet is the diamond.

Answer: Letter C ✅

Hope that helps! ★

Which compound has the strongest hydrogen bonding between its molecules?(1) HBr (3) HF
(2) HCl (4) HI

Answers

(3) HF because HCl is an acid and it seperates easily into water. Flourine has the highest electronegativity so im guessing because it pulls the electrons the hardest that it has the strongest bonds.

What two forces act in the nucleus to create a 'nuclear tug of war'?

Answers

In Nuclei, There are 2 forces. 1 force is electrostatic and acts as repulsion between 2 protons. The other is force of attraction called Nuclear force between 2 neutrons. This nuclear force is a short range force and is so strong that it negates the effect of the force of repulsion between the protons and helps bind the nucleus together. Hope this helped :D

9Ammonia is manufactured from nitrogen and hydrogen by the Haber process.
N2(g) + 3H2(g)2NH3(g)
What is the percentage yield when 60 kg of ammonia is produced from 60 kg of hydrogen?
A
5.9%
B
17.6%
с
35.3%
D
50.0%

Answers

Answer:

17.6%

Explanation:

1. Percentage yield = (Actual yield/theoretical yield) x 100

2. You know actual yield of ammonia (60kg) so you need to work out theoretical yield.

3. mols of hydrogen = m/mr = 60,000/2 = 30,000 mols.

4. 3:2 ratio so (30,000/3) x 2 = 20,000 mols of Ammonia.

5. Therefore mass of ammonia = mr x mols = 20,000 x 17 = 340,000 grams

6. So percentage yield is (60,000/340,000) x 100 = 17.6

Which of the following properties of water is due primarily to the uneven distribution of charge between the hydrogen and oxygen atoms?-Its color
-Its taste
-ability to dissolve ionic substances
-ability to produce buoyant forces

Answers

Answer: ability to dissolve ionic substances

Explanation: Water is made up of hydrogen and oxygen molecules. The less electronegative hydrogen atoms occupy partial positive charge and oxygen being more electronegative occupy partial negative charge.

Due to this polarity, it is able to interact with ionic substances and thus dissolve them easily which is explained by the statement Like dissolves like. The ionic compounds are soluble in polar solvents and non ionic compounds are soluble in non polar solvents.

The ability to dissolve ionic substances is primarily due to the uneven distribution of charge between the hydrogen and oxygen atoms in water.

Water is a polar molecule, meaning it has a positive charge on one side (hydrogen) and a negative charge on the other side (oxygen). This polarity is a result of the unequal sharing of electrons between the hydrogen and oxygen atoms in the water molecule. The oxygen atom has a higher electronegativity than the hydrogen atoms, pulling the shared electrons closer to itself, resulting in a partial negative charge around the oxygen atom and a partial positive charge around the hydrogen atoms.

Because of its polarity, water molecules are attracted to ions in ionic substances. When an ionic compound, such as sodium chloride (NaCl), is added to water, the polar water molecules surround and separate the positive and negative ions, breaking the ionic bonds and causing the substance to dissolve. This ability of water to dissolve ionic substances is essential for various biological processes and makes it an excellent solvent for many substances.

In contrast, the other properties listed (color, taste, ability to produce buoyant forces) are not primarily related to the uneven charge distribution in water molecules but are influenced by other factors such as impurities, dissolved substances, and the reflection of light.

To learn more about distribution of charges, here

brainly.com/question/33958346

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A sample containing 4.80 g of O2 gas has an initial volume of 15.0 L. What is the final volume, in liters, when each of the following changes occurs in the quantity of the gas at a constant pressure and temperature?A. A sample of 0.500 mole of O2 is added to the 4.80 g of O2 in the container. B. A sample of 2.00 g of O2 is removed. C. A sample of 4.00 g of O2 is added to the 4.80 g of O2 gas in the container.