When should you avoid looking directly at magnesium burning?

Answers

Answer 1

Answer:

Answer:

Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.

Explanation:

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What is the mass (in grams) of 1.95 moles of water

Answers

Answer:

35.10 g is the mass of 1.95 moles of water.

Explanation:

Moles of water = 1.95 mol

Mass of 1 mol of water = 18 g

Then the mass of 1.95 moles of water:

Mass of 1.95 mol = $1.95* 18 g = 35.10 g$

35.10 g is the mass of 1.95 moles of water.

Given:
1.95 moles of H20

Required:
mass in grams

Solution:
The molar mass of water is 18.02 grams per mole

1.95 moles of water (18.02 grams / mole of water) = 35.1 grams of water

The process of splitting an atom into two nuclei with smaller masses is called _____. transmutation nuclear fission nuclear fusion chain reaction

Answers

the process of splitting an atom into two nuclei with smaller masses is called nuclear fission

Answer: nuclear fission

Explanation:

Just did the test and got it right. :)

The density of aluminum is 2.70 g/cm3. What is the mass of 235 cm3 of aluminum? 634.5 g
635 g
635 g/cm3
634.5 ml

Answers

Answer:

JUST B

Explanation:

Final answer:

The mass of 235 cm³ of aluminum, which has a density of 2.70 g/cm³, is calculated to be 634.5 g using the formula Mass = Density × Volume.

Explanation:

To find the mass of a given volume of a substance, you can use the formula: Mass = Density × Volume. In this case, the density of aluminum is given as 2.70 g/cm³ and you need to find the mass of 235 cm³ of aluminum.

Substitute the given values into the formula:

Mass = 2.70 g/cm³ × 235 cm³ = 634.5 g

Therefore, the mass of 235 cm³ of aluminum is 634.5 g.

Learn more about Density Calculation here:

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A bond exists between A and B in the compound AB. A and B are sharing electrons. The type of bond is ____

Answers

Answer: Covalent

Explanation:

A covalent bond is formed when an element shares its valence electron with another element. This bond is formed between two non metals. Example: $H_2$

An ionic bond is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element and the element which accepts the electrons is known as electronegative element. This bond is formed between a metal and an non-metal. Example: $NaCl$

Thus bond formed by sharing of electrons is covalent bond.

They are covalent bonds.
Covalend bonds share
Ionic bonds transfer

When 50.0 g of silicon dioxide is heated with an excess of carbon, 32.2 g of silicon carbide is produced. SiO2 (s) + 3 C (s) → SiC (s) + 2 CO (g) What is the percent yield of this reaction?grams of hydrogen gas will be produced?

Answers

Answer:

0.97g

Explanation:

Answer:

0.97g

Explanation:

Which of the following is an oxidation reaction? A. AuCl4- → AuCl 2- B. Mn7+ → Mn2+ C. Co3+ → Co2+ D. Cl2 → ClO3-

Answers

An oxidation reaction involves the loss of electrons or an increase in the oxidation state of an element. Options B, C, and D represent oxidation reactions, while option A does not.

Let's analyze the given options:

A. AuCl₄⁻ → AuCl₂⁻

In this reaction, the gold atom goes from a +3 oxidation state (AuCl₄⁻) to a +1 oxidation state (AuCl₂⁻). This means the gold atom gains two electrons, indicating a reduction rather than oxidation. Therefore, option A is not an oxidation reaction.

B. Mn⁷⁺ → Mn²⁺

In this reaction, the manganese atom goes from a +7 oxidation state to a +2 oxidation state. This indicates a decrease in the oxidation state, which means the manganese atom gains electrons. Therefore, option B represents an oxidation reaction.

C. Co³⁺ → Co²⁺

In this reaction, the cobalt atom goes from a +3 oxidation state to a +2 oxidation state. Similar to option B, this indicates a decrease in the oxidation state, representing an oxidation reaction.

D. Cl₂ → ClO₃⁻

In this reaction, the chlorine molecule (Cl₂) is converted to a chlorate ion (ClO₃⁻). Here, the chlorine atom undergoes an increase in oxidation state, changing from an oxidation state of 0 in Cl₂ to an oxidation state of +5 in ClO₃⁻. This indicates the loss of electrons by chlorine, making option D an oxidation reaction.

Therefore, options B, C, and D represent oxidation reactions, while option A does not.

Learn more about oxidation reaction from the link given below.

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D. There must be oxygen added. 2 of them don't even have oxygen anywhere in the formula, and the 3rd loses oxygen, which is reduction.

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In a laboratory investigation, magnesium reacts with hydrochloric acid to produce hydrogen gas and magnesium chloride. This reaction is represented by the unbalanced equation below.Mg(s) + HCl(aq) ==>H2(g) + MgCl2(aq)State, in terms of the relative activity of elements, why this reaction is spontaneous.

How many moles are in 4.818 x 1024 chloride ions

A substance that speeds up the rate of a chemical reaction is calleda. a catalyst.b. a lipid.c. a molecule.d. an element.

When metals form ions, they tend to do so by what