which of the following are the correct formulas for potassium oxide and calcium oxide respectively

Answer:

Bro what is this math or something

Explanation:

Answer:

the answer is B hsjsjjsksks

Answer:

Kp = 0.949

Explanation:

Hello there!

In this case, according to the given chemical reaction:

[tex]2SO_2(g) +O_2(g) \rightleftharpoons 2SO_3(g)[/tex]

It is possible to set up the equilibrium expression as shown below:

[tex]Kp=\frac{p_{SO_3}^2}{p_{SO_2}^2p_{O_2}}[/tex]

Whereas the initial pressure of SO2 was 3.43 atm and that of O2 was 1.61 atm. Now, since the partial pressure of O2 decreased to the 0.809 atm, it is possible to calculate the change in the pressure of O2 via:

[tex]x=1.61atm-0.809atm=0.801atm[/tex]

Which is actually applied to SO3 and SO2 according to the stoichiometry in the equilibrium expression to calculate Kp:

[tex]Kp=\frac{(2*x)^2}{(3.43-2x)^2(0.809)}[/tex]

Thus, by plugging in x, we obtain:

[tex]Kp=\frac{(2*0.801)^2}{(3.43-2*0.801)^2(0.809)}\\\\Kp=0.949[/tex]

Best regards!

Answer: theres no image or claim

Answer:

LDPE would be the best choice for a hand warmer designed to release heat quickly.

Explanation:

Judging from the graph, the LDPE plastic releases heat quicker than the Latex. (and I also did the gizmo-)

Temperature is a property of matter that represents the amount of energy expended in the motion of the constituent particles.

Matter is any substance that has mass and takes up space by having volume.

The potential to work would be defined as energy.

The definition of motion is still the change in the position and orientation of the body over time.

As a result, the highest temperature of latex is approximately 530°C, while the temperature of LDPE plastic becomes 58°C in the graph above. After 60 minutes, the LDPE plastic will emit less energy toward its surroundings than latex. Latex reaches its highest temperature faster than LDPE plastic.

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Answer:

4.74 g H2

Explanation:

First, balance your reaction:

N2 + 3H2 --> 2NH3

Now convert 26.7 g NH3 to moles NH3 by dividing by its molar mass (17.031 g/mol). Then multiply by the mole ratio of 3 mol H2 for every 2 mol NH3 to get moles of H2. Finally multiply by the molar mass of H2 (2.016 g/mol) to get grams of H2.

26.7 g NH3 • (1 mol NH3 / 17.031 g NH3) • (3 mol H2 / 2 mol NH3) • (2.016 g H2 / 1 mol H2) = 4.74 g H2

Answer:

99 L

Explanation:

Step 1: Given data

Moles of nitrogen: 4.4 moles

Step 2: Calculate the volume occupied by 4.4 moles of nitrogen

The volume occupied by a gas depends on other conditions such as pressure  (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.

P × V = n × R × T

Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.

4.4 mol × 22.4 L/1 mol = 99 L

Answer:

bcs the oven heated it up?

Explanation:

Answer:

D

Explanation:

Answer:

I think it is Greenland and Canada

Explanation:

The Taiga or boreal forest are present in the inland Canada, and Russia.

Taiga is coniferous forest, pines, spruce, and fur are common trees of this forest.

They are present in cold regions, and are adapted to survive in cold areas.

Different types of animals live in this forest, who are adapted to live in cold area, such as birds, rodents, bears, deer, moose, etc.

Siberian tiger is a native species of taiga forest, it is the world's largest cat.

Thus, the correct option is A, Canada, and E, Russia.

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Answer:

C. 548mL

Explanation:

Attached is an image of the explanation. Hope this helps!

Combined gas law states that "the ratio of the product of pressure and volume and the absolute temperature of a gas is equal to a constant".

Temperature ,T₁ = 20⁰C = 20+273.15K = 293.15K

Temperature, T₂ = 40⁰C = 40+273.15K = 313.15K

According to combined gas law,

P₁V₁/n₁T₁ = P₂V₂/n₂T₂

Where, n is moles of substance

P is pressure

P and n are considered to be a constant.

Thus, V₁/T₁ = V₂/T₂

V₁ = V₂T₁/T₂

V₁ = ?,

V₂ = 585mL = 585mL x 293.15K/313.15K

V₁ = 548mL

Hence, the original volume of the helium gas is 548mL.

"Pressure is the force of all the gas particle/wall collisions divided by the area of the wall."

"Volume is the amount of space occupied by a substance."

"Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius."

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Answer:

[tex]V_2=52.2L[/tex]

Explanation:

Hello there!

In this case, by bearing to to mind the given conditions, it is firstly possible to determine the initial volume of the closed system via the ideal gas equation:

[tex]PV=nRT\\\\V=\frac{2.00mol*0.08206\frac{atm*L}{mol*K}*298.15K}{1.00 atm} \\\\V=48.9L[/tex]

Which is V1 in the Charles' law:

[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]

And of course, T1 is 298.15 (25+273.15). Therefore, by solving for V2 as the final volume, we obtain:

[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{48.9L*(45+273.15)K}{(25+273.15)K} \\\\V_2=52.2L[/tex]

Best regards!

Answer:

a) Ba(NO₃)₂(aq) + (NH₄)₂SO₄(aq) ⇒ 2 NH₄NO₃(aq) + BaSO₄(s)

b) CoCl₃(aq) + 3 NaOH(aq) ⇒ 3 NaCl(aq) + Co(OH)₃(s)

c) 2 FeCl₃(aq) + 3 (NH₄)₂S(aq) ⇒ 6 NH₄Cl(aq) + Fe₂S₃(s)

Explanation:

We have 3 double displacement reactions, in which both reactants exchange their cations and anions, and an insoluble compound is formed and precipitates as a solid. This is indicated as (s).

a) Ba(NO₃)₂(aq) + (NH₄)₂SO₄(aq) ⇒ 2 NH₄NO₃(aq) + BaSO₄(s)

b) CoCl₃(aq) + 3 NaOH(aq) ⇒ 3 NaCl(aq) + Co(OH)₃(s)

c) 2 FeCl₃(aq) + 3 (NH₄)₂S(aq) ⇒ 6 NH₄Cl(aq) + Fe₂S₃(s)

The best answer for your question would be C. The total amount of all forms of energy stays the same.

First, let's eliminate the wrong choices. According to the Law of Conservation of Energy, you cannot create nor destroy energy, so you can eliminate choices A and B.

Also according to the Law of Conservation of Energy, the total amount of energy will always be the same. It may transform into different forms of energy.

To me, D doesn't sound very correct. For this one you can take an aducational guess, but I do not believe it would be D.

Hope this helps; have a great day!

Answer:

A nail can rust when exposed to oxygen. the molecules of iron on the surface of the nail exchange atoms with the oxygen in the air and produce a new substance, the reddish brown ferrous oxide i.e rust.

Answer:

False

Explanation:

Negatively charged particles repel other negatively charged particles. Typically a negatively charged particle is electropositive and wants a positive molecule and/or cation (positive ion) to form a bond with. Negative molecules want positive molecules and vise versa.

Answer:

Fe₂O₃ is the limiting reactant.

7.57 g of MgO are formed.

Explanation:

First we convert the given masses of both reactants into moles, using their respective molar masses:

0.0626 moles of Fe₂O₃ would react completely with (3 * 0.0626 ) 0.188 moles of Mg. As there are more Mg moles than required, Mg is the reactant in excess; thus, Fe₂O₃ is the limiting reactant.

We now calculate how many MgO moles are produced, using the number of moles of the limiting reactant:

Finally we convert moles of MgO into grams:

Answer:

Volcanic Activity

Explanation:

Answer: A) Volcanic Activity

Answer:

c.

Explanation:

I think???

Answer:

5 loaves of bread you could make.

5g yeast, 1.5L water, 2000g of flour

Explanation:

To solve this question, we must, as first, convert the moles of salt to grams (1mol NaCl = 58.44g/mol -Molar mass-). With this mass we can find the amount of breads we can use and the amount of the other ingredients:

Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Loaves of bread:

35g salt * (1 loave / 7g NaCl) = 5 loaves of bread you could make

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

The number of 5 loaves of bread you could make.

And, 5g yeast, 1.5L water, 2000g of flour

Here we determine the following calculations:

For Mass NaCl:

0.6mol * (58.44g / mol) = 35g salt

Now

Loaves of bread:

= 35g salt * (1 loave / 7g NaCl)

= 5 loaves of bread you could make

And,

Other ingredients:

1g yeast * 5 = 5g yeast

0.3L H2= * 5 = 1.5L H2O

400g flour * 5 = 2000g flour

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Answer:

[tex]P_{He}=9.06torr[/tex]

Explanation:

Hello there!

In this case, we can identify the solution to this problem via the Dalton's rule because the partial pressure of helium is given by:

[tex]P_{He}=x_{He}P_T[/tex]

Whereas the mole fraction of helium is calculated by firstly obtaining the moles and then the mole fraction:

[tex]n_{He}=8.00g\frac{1mol}{4.00g}=2.00mol\\\\ x_{He}=\frac{n_{He}}{n_{He}+n_{Ar}} \\\\ x_{He}=\frac{2.00mol}{2.00mol+8.60mol}\\\\x_{He}=0.189[/tex]

Then, we calculate the partial pressure as shown below:

[tex]P_{He}=0.189 *48.0torr\\\\P_{He}=9.06torr[/tex]

Best regards!

Answer:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:

1. The balanced chemical reaction is:

[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

2. The balanced chemical reaction is:

[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]

Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.

Best regards!

Answer:

there are three causes of fraud, namely, perceived pressure, perceive opportunities and rationalizations. Pressure can take many forms, including financial and employment pressure. A fraudster also may commit fraud when there is an opportunity, frequently related to weak internal control.

Explanation:

This study found that the most popular type of fraud is misappropriation of assets, including theft of cash and inventories. No significant differences were seen in terms of fraudster position, as they can come from both the lower and the executive level. However, the majority of the fraudsters come from the operational and sales department. This study also found that majority of the fraudsters in the case study were male, new employees and young adults. Their motivations to commit fraud include lack of understanding about fraud behaviour, opportunity to commit fraud and lifestyle and financial pressure.

(hope this helps can i plz have brainlist :D hehe)

Answer:

The answer is false

Explanation:

Because i am taking this safety test and i got that question right ong

Answer:

True

Explanation:

The statement having more moles of solute definitely means a higher concentration (molarity) solution is true.

Molarity is used to define concentration of any solution and it will be define as the no. of moles of solute present in per liter of solution and it is represented as:
M = n/V

From the equation it is clear that molarity of is directly proportional to the moles of the solute present in that. So, more no. of moles shows more concentration of solution.

Hence, given statement is true.

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Answer:

0.125 g

Explanation:

From the question given above, the following data were obtained:

Original amount (N₀) = 1 g

Number of half-lives (n) = 3

Amount remaining (N) =?

We can obtain the amount of the substance remaining by using the following formula:

N = 1/2ⁿ × N₀

N = 1/2³ × 1

N = ⅛ × 1

N = 0.125 × 1

N = 0.125 g

Thus, 0.125 g of the substance will remain after 3 half-lives.

Answer:

C

Explanation:

Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic.

Answer:

The Answer is C.

Explanation:

Cause I'm smart