Chemistry College

25 points!!! What’s the answer???

Answers

Answer 1

Answer:

Explanation:
Cause wave's get larger and larger and it will repeat over and over

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Related Questions

I really need to know the answer it will help

Answers

Answer:

so the answer is A 5.199mol please. rate. me brainliest. if its. correct

Explanation:

N=nL

[tex]3.131 \times {10}^{24} = n \times 6.022 \times {10}^{23} \\n = \frac{3.131 \times {10}^{24} }{6.022 \times {10}^{23} } \\ n = 5.199mol[/tex]

Magnesium ribbon with a mass of 2g was placed into dilute hydrochloric acid. The
equation for this reaction is:
Mg(s) + 2HCI = MgCl2(aq) + H2(g)
The magnesium ribbon reacted and completely disappeared in 30 seconds. Calculate
he rate of reaction.

Answers

The rate of reaction of the magnesium ribbon in the dilute hydrochloric acid is 0.067 g/s.

What is rate of reaction?

Rate of reaction is the rate at which a reaction takes place. It is proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.

Mg(s) + 2HCI = MgCl2(aq) + H2(g)

Rate of reaction = mass of magnesium reacted/time taken

Rate of reaction = 2 g /30 s

Rate of reaction = 0.067 g/s

Thus, the rate of reaction of the magnesium ribbon in the dilute hydrochloric acid is 0.067 g/s.

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In the reaction of nitrogen gas, N2, with hydrogen gas, H2, to form ammonia gas, NH3 , how many moles of hydrogen are needed to react with two moles of nitrogen

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Answer:

6 moles

Explanation:

First find the balanced equation for the rxn

N2 + 3 H2 ===> 2 NH3

each mole of N2 requires 3 moles of Hydrogen

so 6 moles of H needed

How much time would it take for 40000 atoms of sodium-24 (half-life is 15 days) to decay to 2500 atoms?

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Answer:

60 days

Explanation:

2500 = 40000 ( 1/2) ^n

n = 4 half lives

4 half lives * 15 days/ halflife = 60 days

What is the heat capacity equation?

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Answer:

The specific heat capacity is the heat or energy required to change one unit mass of a substance of a constant volume by 1 °C. The formula is Cv = Q / (ΔT ⨉ m)

Write two half‑reactions to describe each of these metal displacement reactions. Include phase symbols.

Mg(s)+CoBr2(aq)⟶MgBr2(aq)+Co(s)

oxidation half‑reaction:

reduction half‑reaction:

Cu(s)+2AuCl(aq)⟶CuCl2(aq)+2Au(s)

oxidation half‑reaction:

reduction half‑reaction:

Answers

In redox reactions, an oxidation half reaction shows the oxusetoon occurring while the reduction half reaction shows the reduction occurring in the overall reaction.

What are redox reactions?

Redox reactions are reactions in which oxidation and reduction reactions occur together to the same extent.

A redox reaction can be split into two half oxidation and reduction reactions.

The half reactions of the given reactions are shown below:

Overall reaction;

[tex]A. Mg(s) + CoBr_2(aq) ⟶ MgBr_2(aq) + Co(s) \\ [/tex]

Oxidation half reaction:

[tex]Mg (s) ---> Mg ^{2+}(aq)[/tex]

Reduction half reaction:

[tex]Co^{2+} (aq) ---> Co (s)[/tex]

B. Overall reaction

[tex]Cu(s) + 2AuCl(aq) ⟶ CuCl_2(aq) + 2Au(s) \\ [/tex]

Oxidation half reaction:

[tex]Cu(s) ---> Cu^{2+}(aq)[/tex]

Reduction half reaction:

[tex]2Au^{+}(aq) ---> 2 Au (s)[/tex]

Therefore, redox equations can be spilt into oxidation and reduction half reactions.

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Which of the following is not a characteristic of both experiments and
surveys?
A. Subjects should be randomly selected.

B. The data collected might be studied for patterns.
C. The researcher exercises direct control over at least one variable.
D. Data are collected about a population.

Answers

Answer:

C. The researcher exercises direct control over at least one variable.

Explanation:

Your answer should be C. The researcher exercises direct control over at least one variable.

I hope it helps! Have a great day!

pan~

A sample has 0.2 moles of salt dissolved in 2 L of solution. What is the molarity

Answers

The molarity of the sample of the salt dissolved in the solution is determined as 0.1 M.

What is the molarity of the sample?

The molarity of the sample is the number of solutes dissolved in liters solution.

molarity = number of moles/Liters of solution

molarity = 0.2 moles / 2L

molarity = 0.1 M

Thus, the molarity of the sample of the salt dissolved in the solution is determined as 0.1 M.

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A compound has a mass percent composition of 58.8% C, 9.86% H and 31.32% O. The molar mass of the compound is 306.39 g/mol.

(a) Calculate the empirical formula.

(b) Calculate the molecular formula

Enter your answers using the following format for a formula: C3H3O3

Answers

The solution would be like this for this specific problem:

Moles of carbon = 58.8 / 12 = 4.9

Moles of hydrogen = 9.8 / 1 = 9.8

Moles of oxugen = 31.4 / 16 m= 1.96

Ratio 4.9 / 1.96 = 2.5 9.8 / 1.96 = 5.0 1.96 / 1.96 = 1

Simplest formula = C5H10

I hope this helps and if you have any further questions, please don’t hesitate to ask again.

what foods can be stored in water and or ice

Answers

Whole, raw fruits or vegetables; cut, raw vegetables such as celery or carrot sticks or cut potatoes; and tofu may be immersed in ice or water.

What is the volume occupied by 11 grams of NO2(g) at STP?

Please Help I don’t understand

Answers

The volume of gas occupied by 11 grams of nitrogen dioxide gas at STP is 5.15 L.

What is the ideal gas equation?

Ideal gas equation of any gas will be writen as:

PV = nRT, where

P = standard pressure = 1 atm

V = volume = ?

R = universal gas constant = 0.082 L.atm/K.mol

T = standard temperature = 273K

n is the moles of gas which can be calculated by using below equation as:

n = W/M, where

W = given mass = 11g

M = molar mass = 46 g/mol

n = 11 / 46 = 0.239mol

On putting values on the above equation, we get

V = (0.23)(0.082)(273) / (1) = 5.15 L

Hence required volume of gas is 5.15 L.

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Why the positive emulsion for bread is not clear?

Answers

Because it’s gay and doesn’t listen

I will mark as brainiest or what ever its called lol. Please helpp

Answers

Answer:

A - Cinder cone

B - Shield

C - Composite

Explanation:

Cinder cone volcanoes are formed when the volcano explodes and all the lava soldifies and falls steeply upon the sides of the mountain and forms cinders.

Shield volcanoes form when a centralized vent produces low-viscosity flows over a long period of time

Composite volcanoes are also called stratovolcanoes. They form when different types of eruptions deposit different materials around the sides of a volcano. Alternating eruptions of volcanic ash and lava cause layers to form. Over time these layers build up.

Answer:

Answer:A - Cinder coneB - Shield C - CompositeExplanation:Cinder cone volcanoes are formed when the volcano explodes and all the lava soldifies and falls steeply upon the sides of the mountain and forms cinders. Shield volcanoes form when a centralized vent produces low-viscosity flows over a long period of time Composite volcanoes are also called stratovolcanoes. They form when different types of eruptions deposit different materials around the sides of a volcano. Alternating eruptions of volcanic ash and lava cause layers to form. Over time these layers build up.:

Soil that are light in color have a great amount of humus in
them. True or False

Answers

Answer:

please the answer Is false

The Ksp of scandium fluoride, ScF3, is 5.81×10−24. Calculate the molar solubility ,s, of this compound.

Answers

The Ksp shows the extent of solubility of a substance in another. The solubility of the compound is 1.2 * 10^-7 M.

What is solubility?

The term solubility shows the extent to which a substance dissolve in solution. The solubility of a substance is often typified by the Ksp of the substance.

Now;

ScF3(s) ⇄Sc^+(aq) + 3F^-

Ksp = [Sc^+] [F^-]^3

Ksp = x (3x)^3

Ksp = 27x^4

x = 4√5.81×10^−24/27

x = 1.2 * 10^-7 M

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Which molecule would provide the most accurate value for the bond length of a nitrogen-nitrogen double bond

Answers

Answer:

i dont know, i wish i could help

Explanation:

A way of generating dry O2 in the lab is to heat potassium chlorate. If you determined that 25 grams of O, are needed, how much potassium chlorate do you need to start with? 2KCI0, ->(heat)2KCI + 30,

Answers

Answer:

About 64 grams of KClO₃.

Explanation:

Potassium chlorate dissociates according to the equation:
[tex]\displaystyle 2\text{KClO$_3$} \xrightarrow{\text{heat}} 2\text{KCl} + 3\text{O$_2$}[/tex]

To determine the amount of KClO₃ necessary to produce 25 grams of O₂, we can convert grams of O₂ to moles; moles of O₂ to moles of KClO₃; and finally to grams of KClO₃.

The molecular weights of O₂ and KClO₃ are 16.00 g/mol and 122.55 g/mol.

Hence:

[tex]\displaystyle 25\text{ g O$_2$} \cdot \frac{1\text{ mol O$_2$}}{32.00\text{ g O$_2$}} \cdot \frac{2\text{ mol KClO$_3$}}{3\text{ mol O$_2$}} \cdot \frac{122.55\text{ g KClO$_3$}}{1\text{ mol KClO$_3$}} = 64\text{ g KClO$_3$}[/tex]

In conclusion, about 64 (to two significant digits) grams of KClO₃ is needed.

Find the pH of a 0.600 M solution of methylamine CH3NH2. Kb= 4.4 x 10^-4

Answers

Since methylamine (CH3NH2) is a weak base, the major species in solution are CH3NH2 and H2O.
Both are bases; however, since water can be neglected as a source of OH-, the dominant equilibrium is:
CH3NH2(aq) + H2O(l) = CH3NH3+(aq) + OH-(aq)
and

The concentrations are as follows:

[OH-] = [CH3NH3+] = x
[CH3NH2] = 1.0 - x
Then,

Assume that 1 >> x, then:
(1.0 - x) = 1.0
Kb = x2 / 1.0
x2 = Kb
x = (Kb)0.5 = (4.38×10-4)0.5 = 0.0209
x= [OH-] = 0.0209 M

We can convert between [OH-] and pOH using the following equations:
pOH = - log[OH-]
pOH = - log(0.0209) = 1.68
pOH = 1.68

For any aqueous solution at 25∘C:
pH + pOH = 14
pH = 14 - pOH = 14 - 1.68 = 12.32
pH = 12.32

Answer: pH = 12.32

How many significant digits are in the following:

pH 7.02

Answers

Answer:

Explanation:

7.02 three sig digits

In a neutralization reaction 30.0mL of 0.234M KOH solution is reacted with 30.0mL of 0.234M HNO3 solution and a temperature rise of 5.6C was observed. Density of base and acid=1.00g/mL and the specific heat of the mixture is 4.18j/g•C

a) write the balanced equation of the reaction
b) calculate the moles of water produced
c) calculate the total heat produced
d) calculate the enthalpy of neutralization of the reaction

Answers

Based on the data provided, the equation of the reaction is:

[tex]KOH + HNO_3 \rightarrow KCl + H_2O[/tex]moles of water produced = 0.00702 molesHeat produced = 1404.48 JEnthalpy of neutralization = 200 kJ/mol

What is enthalpy of neutralization?

Enthalpy of neutralization is the heat change when one mole of hydrogen ions from an acid reacts with one mole of hydroxide ions from an alkali to produce one mole of water.

The equation of the reaction of KOH and HNO3 is given below:

[tex]KOH + HNO_3 \rightarrow KCl + H_2O[/tex]

1 mole of KOH reacts with 1 mole of HNO3 to produce 1 mole of water.

Volume of KOH = 30 mL = 0.03 L

moles of KOH = 0.03 × 0.234 = 0.00702 moles

Therefore, 0.00702 moles of water are produced

Heat produce = mass × specific heat × temperature difference

Volume of solution = 60 mL

density of solution = 1.0 g/mL

mass of solution = 60 mL × 1.0 g/mL = 60 g

Heat produced = 60 × 4.18 × 5.6

Heat produced = 1404.48 J

Enthalpy of neutralization = 1404.48 J/0.00702 moles

Enthalpy of neutralization = 200068.37 J/mol

Enthalpy of neutralization = 200 kJ/mol

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A student places a 50.0 g sample of a metal at 96.8° C into a calorimeter full of 100.0 g of
water (specific heat of water = 4.18 J/g°C). The water, initially at 22.0 °C, eventually
comes to a temperature of 25.9 °C. Calculate the heat gained by the water.

Answers