why do we not know what was on the far side of the moon until 1960's

Answer:

Homogeneous solutions are solutions with uniform composition and properties throughout the solution.

Explanation:

For example a cup of coffee, perfume, cough syrup, a solution of salt or sugar in water, etc. Heterogeneous solutions are solutions with non-uniform composition and properties throughout the solution.

Answer:

A homogeneous mixture is a mixture in which the composition is uniform throughout the mixture. Example: The salt water  is homogeneous because the dissolved salt is evenly distributed throughout the entire salt water sample. Another examples are wine, blood, vinegar

Explanation:

Answer:

(70 x 2 + 16 x 3) x 29/70 x 2 = 38,9428571 g.

Explanation:

Distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

Water Distillation Systems has several advantages and some of the advantages include;

Thus, distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

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The molarity of a solution prepared by dissolving 3.11 grams of NaOH in

enough water to make 300 milliliters of solution is 0. 256 mol/ L

Explanation:

Molarity (M) is the amount of a substance in a given volume of solution. It is otherwise known as the number of moles of solute in a certain amount of solution.

The unit of molarity is mol/L

Molarity = number of moles of solute divided by the volume of the solution\

Molarity = ?

Number of  moles is calculated using :

Mass of the solute = 3.11 grams of NaOH

Molar mass of the solute = Na + O + H

Let's input the atomic numbers of the elements: Na (23) , O (16) , H (1)

Molar mass of NaOH = 23 + 16 + 1 = 40 g/ mol

Number of moles = 3.11 ÷ 40 = 0.077 mol

Volume of the solution is measured in Liters

Let's convert 300 milliters to liters = 300 divided by 1000 = 0.3 Liters

Molarity = 0.077 ÷ 0.3 = 0. 256 mol/ L

Therefore, the Molarity of the solution is 0. 256 mol/ L

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Answer:

200 torr

Explanation:

because it have 250ml when we subtract the 50 we get answer

Addition of water to an alkyne gives a keto‑enol tautomer product and that is the product changed into 2-pentanone, then the alkyne need to had been 1-pentyne. 2-pentyne might have given a combination of 2- and 3-pentanone.

They carries a carbonyl bond even as enol implies the presence of a double bond and a hydroxyl group. The keto-enol tautomerization equilibrium is depending on stabilization elements of each the keto tautomer and the enol tautomer.

Electrical engineers are the scientists that study the production of electricity more efficient.

Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.

So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.

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Answer:

1.034 L

Explanation:

P1 V1 = P2 V2

P1 V1 / P2 = V2

2.4 (2.5) / 5.8 = V2 = 1.034 L

Answer:

Incisors: These are the teeth at the front of the mouth and the most visible ones when we smile. Bicuspids: Also called premolars, the bicuspids come after the canines and are flatter than the canines and incisors. Molars: At the back of your mouth, you'll find wide, flat molars.

Explanation:

give me a heart and star txs

Given the heat of fusion for aluminum is 3.95 kJ/g, it takes 198 kJ of energy to melt 50.0 g of aluminum.

It is a physical process in which a solid absorbs energy in the form of heat to melt into a liquid.

The heat of fusion (ΔH°fus) for aluminum is 3.95 kJ/g. We can calculate the amount of energy (Q) required to melt 50.0 g (m) of aluminum using the following expression.

Q = ΔH°fus × m = 3.95 kJ/g × 50.0 g = 198 kJ

Given the heat of fusion for aluminum is 3.95 kJ/g, it takes 198 kJ of energy to melt 50.0 g of aluminum.

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The reaction:

C2H4 + H2 = C2H6

what is the maximum mass of ethane (c2h6) that can be formed?

The amount of hydrogen:

n(H2) = m(H2) / M(H2) = 5.28 / 2 = 2.64 mol

The amount of ethylene:

n(C2H4) = m(C2H4) / M(C2H4) = 9.91 / 28 = 0.354 mol

We see that the hydrogen is an excess reagent

The maximum mas of ethane is:

m(C2H6) = n(C2H4) * M(C2H6) = 0.354 * 30 = 10.62 g

what is the formula for the limiting reagent? - C2H4

what mass of the excess reagent remains after the reaction is complete? grams

The amount of hydrogen after reaction:

n2(H2) = 2.64 - 0.354 = 2.286 mol

m2(H2) = 2.286 * 2 = 4.572 g

Answer: m(C2H6)=10.62 g; C2H4; m2(H2)=4.572 g

Answer:

V H2SO4=30 ml=0.03 l

Cm=16M

CM=n/V

n=CM×V

n= 0.48 moles H2SO4

Cm=0.48/0.3

CM=1.6M

Answer B

Answer:

¿Cuál será el pH de una disolución saturada de hidróxido de cinc?.

Explanation:

Dato: Kps (Zn(OH)2) = 1,8 x 10-14. Solución: 9,52.

The molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

The measure of the degree to which a substance gets dissolved in a solvent to become a solution.

The formula for determination of molar solubity is

[tex]\rm K_{sp} = [A^+]^a [B^-]^b[/tex]

[tex]\rm K_{sp}[/tex]          = solubility product constant

[tex]\rm [A^+]^a[/tex]  =     cation in an aqueous solution

[tex]\rm [B^-]^b[/tex]  = anion in an aqueous solution

a, b          = relative concentrations of a and b

We have the data given as

[tex]\rm K_{sp}[/tex] for Ag₂CrO₄ is 8 x 10⁻¹²

For Silver chromate , the solubility would be only one-half of the Ag⁺ concentration.

We denote the solubility of Ag₂CrO₄ as S mol L⁻¹.

Then for a saturated solution, we have

[Ag⁺]=2S

[CrO₂⁴⁻]=S

the relation between the solubility and the solubility product constant depends on the stoichiometry of the dissolution reaction

(2S)²(S)=4S³ = 8 * 10⁻¹²

S=∛ (2*10⁻¹²)

S= 1.26 * 10⁻⁴ M

2S = 2.52 * 10⁻⁴ M

Therefore the molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

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#1

You used red pen highlight which made things messier

The correct name should be.

As a methyl group attached with 9th carbon

#2

methyl group at 4

double bond at 2

#3

Three methyl groups are present

Double bond at 2

#4

#5

2,5-Dimethyl Hex-3-ene

The relation between the volume of the gas and the temperature is established by Charles's law. With a decrease in the temperature, the volume decreases by 45.7 mL. Thus, option c is correct.

Charle's law states the direct relation present between the temperature and the volume of the gas. The law is given as:

V₁ ÷ T₁ = V₂ ÷ T₂

Given,

V₁ = 50 mL

T₁ = 303.15 K

T₂ = 277.15 K

Substituting the value the final volume is calculated as:

50 ÷ 303.15 = V₂ ÷ 277.15

V₂ = (50 × 277.15) ÷ 303.15

= 45.71 mL

Therefore, option c. 45.7 mL is the final volume.

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Answer: B - 0.0098 moles

Explanation:

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Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

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Answer:

Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

What is an experience?

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

Daryl has visited many other countries.

Alfonso has developed many strong friendships

Marion has worked at jobs that improved his time-management skills.

Explanation:

Answer:

see below

Explanation:

When a substance goes from a solid to a gas without going through a liquid stage .     Mothballs is an example.

Answer:

A- c7h6br2

Explanation:

i just got it right :)

Answer: C

Explanation:

So, the formula mass of aluminum chloride is 26.98154+3(35.453)=133.34054 g/mol.

This means that 42.3 grams of aluminum chloride are 42.3/133.34054=0.31723285356426 moles.

From the equation, we know that for every 3 moles of bromine consumed, 2 moles of aluminum chloride are consumed.

This means that (0.31723285356426)(3/2)=0.47584928034639 moles of bromine are needed.

So, the formula mass of a bromine molecule is 2(79.904)=159.808 g/mol, and thus the answer is (159.808)(0.47584928034639), which is about 76.1 g

The insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

The insecticides could kill the owls but not the grasshopper or mice because the active ingredients in that insecticide is harmful for owls while on the other hand, the grasshopper and mice are tolerant to that insecticide.

So we can conclude that the insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

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Answer:

1. HCl + Fe

2. HNO3 + NaOH

Explanation:

Answer:

1) acid + metal --> salt + h2
2) acid + base --> salt + water

Explanation:

btw in number 1... h2 is 2 atoms of hydrogen

example:
1) 2HCL + 2NA --> 2NACL + H2

2) HCL + NAOH --> NACL + H2O

An E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.

The term elimination has to do with the removal of a proton from the substrate by a base.

This question is incomplete and the complete question showing the options have been shown in the image attached to this answer.

This elimination  results in an alkene being formed. For the substrate alkyl halide shown in the question, an E2 mechanism is not followed because an anti periplanar E2 elimination is impossible due to the lack of beta hydrogen.

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Answer:

50g of MgO

Explanation:

2Mg +O2 -----------> 2MgO

2moles of Mg needs 1mole of O2 for complete reaction ie

48g/mol of Mg --------- 32g/mol of O2

Xg of Mg --------- 30g of O2

X=45g of Mg

30g of O2 needs 45g of Mg, but only 30g of Mg is available, thus Mg is the limiting reagent.

2mole of Mg produces 2moles of MgO

ie 48g/mol of Mg ---------- 80g/mol of MgO

==> 30g of Mg -------------- Xg of MgO

X= 50g of MgO.

Answer:

go with the fourth one because I did that one

in digital signals, codes are used while in analogue signals do not use signals.

Signals are defined as the instructions which are transferred to another source in other to deliver a message.

There are two types of signals which include the digital and analogue signals.

The digital signals uses codes which is a secret way of sending messages while analogue doesn't use codes.

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Answer:

1) K and Rb

2) 20 protons, 20 neutrons, and 20 electrons.

Explanation:

1) If it's in the same column, it has the same # of valence electrons (e- on the outer shell), therefore similar chemical properties.

2)

1) atomic #, 20, is the number of protons

2) subtract the mass number from # of protons, which you get 20 neutrons

3) Number of electrons in a neutral atom = number of electrons, which is 20. You can also check yourself by looking at electron configuration on a full periodic table.

Taking into account the definition of dilution, if you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, you need to add more solvent until you get a final volume of 500 mL.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

1 M× 100 mL= 0.2 M× Vf

Solving:

(1 M× 100 mL)÷ 0.2 M= Vf

500 mL= Vf

In summary, if you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, you need to add more solvent until you get a final volume of 500 mL.

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Answer:

3 grams

Explanation:

14 g of N2   is 1/2 mole

  If you halve the N2   in the balanced equation , you have to halve the H2 down to 1.5 moles of H2    which is 3 grams