Chemistry College

URGENT (will give brainliest)​

URGENT (will Give Brainliest)

Answers

Answer 1

The overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

What is chemical equation?

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The combustion involves reactants that is 413×4 +498×2=2648 kJ.

Thus, overall energy change for the combustion of one mole of methane according to given chemical equation is 2648 kJ/mole.

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Related Questions

If a solid dissolves in a liquid. Sedimentation and decantation method cannot be used. Why?

Answers

Explanation:

Sedimentation and decantation are separation techniques that rely on the differences in densities of the solid and liquid components. In the case of a solid dissolving in a liquid, the solid particles become uniformly dispersed throughout the liquid, forming a homogeneous mixture.

Since the solid particles are not settling down due to gravity and instead are evenly distributed throughout the liquid, sedimentation cannot be used to separate the solid from the liquid. Similarly, decantation, which involves pouring off the liquid while leaving the settled solid behind, is not applicable because there is no settled solid.

To separate a dissolved solid from a liquid, other separation techniques such as filtration or evaporation may be used. Filtration involves passing the mixture through a filter medium that retains the solid particles while allowing the liquid to pass through. Evaporation involves heating the mixture to vaporize the liquid component, leaving the solid behind.

Answer the following:

Answers

IV. a. C₂H₂

b. C₂H₄

V. a. C₅H₄

b. C₆H₆

VI.

a. Reactants: Na₂SO₄(aq) + Ca(NO₃)₂(aq) Products: CaSO₄(s) + 2NaNO₃(aq). Type of reaction: Double displacement or precipitation reaction.

b. Reactants: Mg(s) + N₂(g) Products: Mg₃N₂(s). Type of reaction: Synthesis reaction.

VII.

a. 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g)

b. Ca₃(PO₄)2(aq) + 6H₃PO₄(aq) → 3Ca(H₃PO₄)₂(aq)

c. 3NaOH(aq) + FeCl₃(aq) → Fe(OH)₃(s) + 3NaCl(aq)

What is the chemical equation about?

In part IV, we were asked to write the molecular formula of given compounds based on the given elemental components. For example, acetylene is composed of 2 carbon atoms and 2 hydrogen atoms, so its molecular formula is C₂H₂. Similarly, ethylene has 2 carbon atoms and 4 hydrogen atoms, so its molecular formula is C₂H₄.

Lastly, In part VII, we were asked to balance given chemical reactions. Balancing a chemical equation involves adjusting the coefficients in front of the reactants and products to ensure that the number of atoms of each element is equal on both sides of the equation. For example, in the reaction where solid mercury (II) nitrate is heated to produce liquid mercury, nitrogen gas, and oxygen gas, the balanced equation is 2Hg(NO₃)₂(s) → 2Hg(l) + 2NO₂(g) + O₂(g). Also, we can balance the other two equations given in part VII by adjusting the coefficients.

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Which is made by weathering?
Question 5 options:

sediments

ash

magma

minerals

Answers

Answer: sediments

Explanation: Weathering of volcanic ash and pumice is unique regarding minerals formed and mineral formation. These minerals include allophane, imogolite, opaline silica, and some halloysites, and have distinctive structures and properties. Mar 10, 1987

Erosion and weathering transform boulders and even mountains into sediments, such as sand or mud. A dissolution is a form of weathering—chemical weathering. With this process, water that is slightly acidic slowly wears away the stone. These three processes create the raw materials for new, sedimentary rocks.

2. When administering an oral liquid to a patient what PPE is required?

Single chemo-therapy gloves

Double chemo-therapy gloves

Protective gown

Respiratory protection
Double chemo-therapy gloves and Protective gown

Answers

Answer:

Among the options you provided, the correct answer would be Double chemo-therapy gloves and Protective gown, as administering oral liquid to a patient carries a risk of splashing or splattering, and healthcare workers may want to avoid any contact with the patient's body fluids or the medication. However, it is important to note that this may depend on the specific policies and regulations in the healthcare setting, and healthcare workers should always follow the appropriate protocols and guidelines. Respiratory protection is not typically necessary for administering oral liquid. Single chemo-therapy gloves may be used for standard precautions, but the use of double gloves may provide additional protection.

Explanation:


Which of the following isotopes contains the same number of protons as 23Na+? And why

23Na
22Na
24Mg
24Al-

Answers

Answer:

23Na

Explanation:

23Na+ has 11 protons since the atomic number of sodium (Na) is 11.

Therefore, the isotope that contains the same number of protons as 23Na+ is 23Na itself.

22Na has 10 protons, 24Mg has 12 protons, and 24Al- has 13 protons. Therefore, they dont contain the same number of protons as 23Na+.

Which statement is completely accurate?

Responses

Atoms of the same element always have different atomic weights.

Atoms of the same element always have different atomic weights.

Atoms of the same element can have neutrons but exist without protons.

Atoms of the same element can have neutrons but exist without protons.

Atoms of the same element always have different numbers of neutrons.

Atoms of the same element always have different numbers of neutrons.

Atoms of the same element can have different numbers of neutrons.

Answers

Answer:

Atoms of the same element can have different numbers of neutrons.

Explanation:

This statement is true because atoms of the same element have the same number of protons, which determines the element's atomic number. However, they can have different numbers of neutrons, which gives rise to different isotopes of that element. These isotopes have the same number of protons, but different numbers of neutrons, leading to different atomic weights. So, while the number of protons is fixed for a particular element, the number of neutrons can vary.

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