can someone solve this?

Answer:

Sodium oxide

Explanation:

Answer: Sodium oxide

Answer:

What are the options?

Explanation:

......

Answer:

Nucleus

Explanation:

they originate in the nucleus

Answer:

(8.3×40)+(8.3×71)

921.3grames

Answer:

[tex]\Large \boxed{\sf 921.3 \ g}[/tex]

Explanation:

Use formula

[tex]\displaystyle moles=\frac{mass}{M_r}[/tex]

[tex]M_r=40+35.5 \times 2 = 111[/tex]

Solve for mass

[tex]mass=8.3 \times 111=921.3[/tex]

Answer:

The Industrial Revolution

Answer:

I believe it would be D, to enhance the survival rate.

Explanation:

Answer:

D

Explanation:

to enhance the survival

Answer:

12.6 g of H₂O can be produced in the combustion

Explanation:

This excersise involves an easy combustion reaction:

2C₄H₁₀  +  13O₂  →   8CO₂  +  10H₂O

First step: calculate moles of reactants in order to find out the limiting.

23 g . 1mol / 58g = 0.396 moles of butane

29.1 g . 1mol /32g = 0.909 moles of O₂

2 moles of butane react to 13 moles of oxygen

Then, 0.396 moles of butane may react to (0.396 . 13) / 2 = 2.574 moles

Certainly we do not have enough oxygen, so O₂ becomes the limiting reactant

13 moles of O₂ can produce 10 moles of water

Then 0.909 moles may produce (0.909 . 10) /13 = 0.699 moles H₂O

We convert moles to mass → 0.699 mol . 18 g/mol = 12.6 g

Answer:

[tex]\mathbf{a \ strong \ base \ such \ as\ LiOH \ or \ NaOH.}[/tex]

Explanation:

In the condensation reactions of carbonyl compounds, it is essential to establish the order of events in advance to minimize or suppress the possibilities of self-condensation and the occurrence of cross-condensation, which unfortunately are an obvious threat in these reactions.

Self-condensation:

Any carbonyl compound that has one or more alpha hydrogens, on the carbons adjacent to the carbonyl group, runs the risk of undergoing a self-condensation reaction if the corresponding rigor is not carried out.

Cross-condensation:

Ideally, in the condensation reactions of carbonyl compounds, one of the reacting molecules should quickly enolise, while the other preferably should not have Hα, to ensure that no other by-products are formed.

[tex]\text{To achieve this process;}[/tex] [tex]\text{A self-aldol or crossed aldol requires a strong base such as LiOH or NaOH.}[/tex]

Answer:

Explanation:

It processes the environment and sends out signals.

Answer:

3 moles of NH₄Cl

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

NH₃(g) + HCl(g) → NH₄Cl(s) ΔH = –176 kJ

From the balanced equation above,

1 mole of NH₄Cl where obtained when the change in enthalphy (ΔH) was –176 kJ.

Finally, we shall determine the number of mole of NH₄Cl produced when the change in enthalphy (ΔH) is –528 kJ. This can be obtained as follow:

From the balanced equation above,

1 mole of NH₄Cl where obtained when the change in enthalphy (ΔH) was –176 kJ.

Therefore, Xmol of NH₄Cl will be obtained when the change in enthalphy (ΔH) is –528 kJ i.e

Xmol of NH₄Cl = –528 / –176

Xmol of NH₄Cl = 3 moles

Thus, 3 moles of NH₄Cl where obtained from the reaction.

Answer: The correct answer is 2 moles.

Explanation:

Answer:

the answer is 2y!

Explanation:

3y+3y =6y -4y = 2y

Answer:

True

Explanation:

Messelson and strahl explain the semiconservative existence of DNA replication by using CsCl gradient centrifugation. The hardest would go and rest at the base of the test tube, while the lightest would be at the top, the lightest would find a position between the heavy and the lightest. When the heavy tube is centralized, from a pool of light, bulky and moderate DNA.

This technique is called density-gradient centrifugation. Hence, the given statement is true.

Answer:

MgS + KI = K2S + MgI2

Answer: Molar mass of [tex]NH_3[/tex] is 17.00 g and moles in 50.0 grams is 2.94.

Explanation:

Molar mass is defined as the mass in grams of 1 mole of a substance.

S.I Unit of Molar mass is gram per mole and it is represented as g/mol.

Atomic Mass of Nitrogen (N) = 14.00 g

Atomic Mass of Hydrogen (H) = 1.00 g

Molar mass of [tex]NH_3[/tex] = 1(14.00)+3(1.00) g = 17.00 g

According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles and weigh equal to its molecular mass.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

[tex]\text{Number of moles of }NH_3==\frac{50.0g}{17.00g/mol}=2.94moles[/tex]

Answer:

yes correct salt hardens soap

Answer:

Explanation:

Atomic number = 8

Electron = 8

1s level= 2

2nd level = 6

3rd level =0

Hope this help

[tex]\huge\underline\mathbb\pink{ANSWER\::}\\\\[/tex]

Atomic Number : 8

Total number of electron : 8

1st level Electrons : 2

2nd level Electrons : 6

3rd level Electrons : 0

[tex]\\\\\\[/tex]

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Answer: i could be incorrect but im pretty sure the answer is, Gas surface with no rings.

Explanation:

s-s-s-science!

Answer:

Gas surface with no rings.

Explanation:

Answer:

stress

Explanation:

people cn get stressed and not want to do work

The third picture has only one type of combination of atoms so it represents a pure compound. Therefore, option (c) is correct.

A pure compound is a compound that contains two or more elements combined chemically in a fixed ratio. These compounds can be broken down into separate or simple elements by chemical methods.

A pure compound is formed when elements are joined together by chemical bonds. Compounds such as water, crystals, and baking soda as pure.  

Water is a compound formed by the combination of oxygen and hydrogen in a fixed ratio. A pure substance is a substance that has only one kind of atom or molecule having a constant composition.

The first picture represents pure substance and the 2nd and 4th pictures represent mixed compounds. Therefore, the third picture represents a pure compound.

Learn more about pure compounds, here:

https://brainly.com/question/8117196

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Answer:

pls answer this link for the answer :D

Explanation:

https://brainly.com/question/22200936

Answer:

Latitude

ocean currents

Wind

Elevation

Water

Answer: The formula for  tetracarbon difluorine octabromide is [tex]C_4F_2Br_8[/tex]

Explanation:

The naming of covalent compound is given by:

The less electronegative element is written first.

The more electronegative element is written second. Then a suffix is added with it. The suffix added is '-ide'.

If atoms of an element is greater than 1, then prefixes are added which are 'mono' for 1 atom, 'di' for 2 atoms, 'tri' for 3 atoms and so on.

Hence, the correct formula for  tetracarbon difluorine octabromide is [tex]C_4F_2Br_8[/tex]