can you help me with balancing equations​

The answer should be diamond.

Explanation:

Sorry but I really need these points I just need 5 more sorrrryyy

Answer:

m = 51.93 grams

Explanation:

Given that,

Energy added, Q = 747 joules

The specific heat capacity of Aluminium, c = 0.899 J/g°C

The temperature goes from 105.0°C to 121.0°C.

Let the mass of the aluminum sample is m. We know that, the heat added to the system is given by :

[tex]Q=mc\Delta T\\\\m=\dfrac{Q}{c\Delta T}\\\\m=\dfrac{747}{0.899 \times (121-105)}\\\\m=51.93\ g[/tex]

So, the mass of the sample is 51.93 grams.

Answer:

The correct answer is - B. dissolving → evaporation filtration → crystallisation

Explanation:

The method of the preparation of a pure sample of copper(II) sulfate from dilute sulfuric acid and copper II oxide is given as follows:

step 1. Adding dilute sulfuric acid into a beaker. Using bunsen burner heat the beaker.

step 2. Adding the copper (II) oxide into the beaker and give it a little time at a time to the warm dilute sulfuric acid and stir

step 3. Filtering the mixture into an evaporating vessel to remove the excess copper (II) oxide and water from the filtrate.

Step 4. leave the rest filtrate to crystallize.

Copper (II) Oxide  {CuO (s)}  +  Dilute Sulfuric Acid {H2SO4 (aq)}   →  Copper (II) Sulphate {CuSO4 (s)}   +  Water {H2O}

The correct sequence of steps for the preparation of a pure sample of copper(II) sulfate crystals from copper(II) oxide and sulfuric acid is dissolving → evaporation filtration → crystallisation.

Purest form of any substance is the crystalline form, if we get the compound in the crystalline form from any extraction then we get a pure sample.

Crystals of copper(II) sulfate, will get from copper(II) oxide and sulfuric acid through following steps:

Hence, option (B) is correct.

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Answer:

Spectral lines are produced by transitions of electrons within atoms or ions. As the electrons move closer to or farther from the nucleus of an atom (or of an ion), energy in the form of light (or other radiation) is emitted or absorbed.…

Explanation:

Specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.

Spectral lines are produced when the electrons undergoes transitions within atoms or ions. When the electrons move far or near to nucleus of any atom, radiation of particular wavelength is emitted or absorbed.

These emitted light is represented as they are moving from one state to the another.

Thus, specific lines appear in a line spectrum because produced by transitions of electrons within atoms or ions.

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Answer:

51.81g of K2O are produced

Explanation:

Based on the reaction, 4 moles of K reacts per mole of oxygen to produce 2 moles of K2O. To solve this question we must find the moles of each reactant in order to find the limiting reactant. With limiting reactant we can find the moles of K2O produced and its mass:

Moles K -Molar mass: 39.0983g/mol-

43g * (1mol / 39.0983g) = 1.1 moles K

Moles O₂ -Molar mass: 32g/mol-

32g * (1mol / 32g) = 1mol O₂

The moles required for the reaction of 1 mole of O₂ are 4 moles of K. As there are just 1.1 moles, K is the limiting reactant.

The moles and the mass of K2O produced are:

1.1moles K * (2mol K2O / 4mol K) = 0.55 moles K

Molar mass K2O = 94.2g/mol

0.55 moles K * (94.2g / mol) =

Answer:

B.

Explanation:

Answer:

(a) Crop rotation.

Explanation:

Crop rotation is the rotational cultivation of crops one after another in the same field or area. This means that different crops are cultivated in sequence, one after the other, on a rotational basis.

Crop rotation is one way of maintaining the nutrients of the soil. It also allows for the production of different crops without the need to move from one place to another. Crop rotation also helps in growing seasonal crops, thereby making crop production stable, providing a constant supply of crops for the farmers.

Thus, the correct answer is option a.

Answer:

12 moles of water (E)

Explanation:

The first step is to see that the equation is balanced. It is now, but you did something strange to the Mg3N2.

Mg3N2(s) + 6H20(l)   ======>  3Mg(OH)2(s) + 2NH3(g)

What the equation is telling you is that 1 mol of Mg3N2 requires 6 moles of water for the reaction to occur.

So 2 mols of Mg3N2 would require 6*2 mols of water to react.

The answer is 12 moles of water

Answer:

B

Explanation:

Gravity pulls so if it is greater, then earth will fallllllll

If the force of gravity between Earth and the sun were greater than Earth’s inertia then the Earth would fall into the sun. The correct option is B.

The force that keeps the gases in the sun together. The force that causes a ball thrown into the air to fall back down.

The force that causes a car to coast downhill even when no gas is applied. The force that results to a glass to fall to the floor when it is dropped.

The stronger the pull of the gravitational forces they exert on each other, the greater the mass of the two objects and the shorter the distance between them.

The Sun's gravity is approximately 27.9 times that of Earth, and it aids in the control of the tides on Earth.

The Earth would fall into the sun if the force of gravity between Earth and the sun was greater than the force of inertia.

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Answer:

Theoretical yield of CO₂ is 66 g

Explanation:

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

C + O₂ —> CO₂

Next, we shall determine the mass of C that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:

Molar mass of C = 12 g/mol

Mass of C from the balanced equation = 1 × 12 = 12 g

Molar mass of CO₂ = 12 + (16×2)

= 12 +32

= 44 g/mol

Mass of CO₂ from the balanced equation = 1 × 44 = 44 g

SUMMARY:

From the balanced equation above,

12 g of C reacted to produce 44 g of CO₂.

Finally, we shall determine the theoretical yield of CO₂. This can be obtained as follow:

From the balanced equation above,

12 g of C reacted to produce 44 g of CO₂.

Therefore, 18 g of C will react to produce = (18 × 44)/12 = 66 g of CO₂.

Thus, the theoretical yield of CO₂ is 66 g.

Answer:

66 grams

Explanation:

Answer:

Nichrome

Answer: Hot water system coils are commonly made up of metal alloys which are a combination of two or more elements. The most commonly used metal alloy is “Nichrome”. Nichrome is an alloy of nickel (80%) and chromium (20%).

Answer:

1.01 L

Explanation:

Step 1: Write the balanced equation

2 HCl + CaCO₃ ⇒ H₂O + CO₂ + CaCl₂

Step 2: Calculate the reacting moles of HCl

64.0 mL (0.0640 L) of 1.261 M (1.261 mol/L) HCl react. The reacting moles are:

0.0640 L × 1.261 mol/L = 0.0807 mol

Step 3: Calculate the moles of CO₂ produced from 0.0807 moles of HCl

The molar ratio of HCl to CO₂ is 2:1. The moles of CO₂ produced are 1/2 × 0.0807 mol = 0.0404 mol.

Step 4: Calculate the volume occupied by 0.0404 moles of CO₂

0.0404 moles of CO₂ are at 28 °C (301 K) and 0.987 atm. We can calculate the volume occupied using the ideal gas equation.

P × V = n × R × T

V = n × R × T / P

V = 0.0404 mol × (0.0821 atm.L/mol.K) × 301 K / 0.987 atm = 1.01 L

Answer:

They cannot be re-melted by heating to form into new shapes.

Explanation:

Recycling refers to the process of melting a plastic and making it into another shape or size.

Thermoplastics can be softened repeatedly, melted and remoulded. Thermosetting polymers can not be softened, melted and remoulded once they are formed.

Hence, thermosetting polymers cannot be re-melted by heating to form into new shapes therefore they can't be recycled.

Answer:

4 hours a day

Explanation:

240/60=4

Answer:

Explanation:

Explanation:

If Earth’s temperatures increase, it would likely have these effects:

The East Coast of the United States will face an increased risk of hurricanes as warmer waters increase evaporation.

The polar region will experience melting ice caps, which will cause sea levels to rise.

Warmer water in the Great Lakes will cause heavier lake-effect snows.

In the Pacific Ocean, heating of the water will cause a change in convection currents.

Hot, dry conditions will increase the risk of wildfires in the forests of California.

In the Himalayas, animal and plant life will migrate to higher ground to live.

The coastal regions of Europe will be at greater risk of flooding because of rising sea levels.

Answer:

a) Burning

b) physical

c) 10

d) constant

Explanation:

Mass remains same in a physical reaction. It changes only in chemical reactions where some of the mass is lost as energy /heat.

Thus, during combustion mass changes while during melting mass of water do not changes.

Answer:C

conjugate of H3O+ is H2O

Answer:

Explanation:

same thing as normal plane. just replace normal metal with this new sick metal :cool:

also make sure it weighs a good amount and won't fall from weight... im confused was this already answered???

Answer:

Collaborate with other engineers in the design of a plane made from this metal

Explanation:

<3

Answer:

8.14x10⁻³ moles of N

Explanation:

In order to solve this problem first we convert 0.179 grams of N₂O into moles, using its molar mass:

Then we convert N₂O moles into N moles, using the data given by the compound's formula (that there are two N moles per N₂O mol):

Answer:

See explanation below

Explanation:

You are not providing the alkene you want to stabilize, however, I manage to find a similar question with an alkene. All you have to do is follow the same procedure, cause its pretty similar the steps.

According to the below picture, we have an alkene between carbon 1 and 2, where carbon 2 is less stable than carbon 3 which have another methyl group.

In order to do this, in a first step, the alkene is converted into a alkane by the addition of a hydrogen atom that the hydronium has. Then, in the next step, we have a substraction of the hydrogen in carbon 3 to form the double bond between carbon 1 and 3.

Solution :

a). In this experiments, we can determine the hardness of the water or [tex]$Ca^{2+}$[/tex] ion concentration in the sample.

b). The Possible errors are :

- During the weighing of calcium standard preparation, if the balance is not traced properly, it will cause an error.

- By dilution of standard from the stock will lead a dilution error of 0.1 mL for 100 mL.

- Misreading the liter values will give an error.

c). Depending upon the calcium content present in the soil, we conclude that the fertile percent of the soil as well as the mineral capacity of the soil.

Answer:

true

Explanation:

Answer:

the answer is c

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\ [/tex]

But from the question

volume = final volume of water - initial volume of water

volume = 165 - 150 = 15 mL

We have

[tex]density = \frac{225}{15} = 15 \\ [/tex]

We have the final answer as

Hope this helps you

Answer: true

Explanation:

Energy changes are a common component of physical and chemical changes in matter. Hence the statement is True.

Physical changes and chemical changes are the two different types of changes that chemists examine. A substance can undergo physical changes without having its identity altered. Chemical transformations take place when one substance transforms into another.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that atoms and molecules are ordered, which leads to the formation of new substances with new properties.

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Answer:

C I think

Explanation:

Answer:

0.41kg/s

Explanation:

Question 5 In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that 505. liters per second of dinitrogen are consumed when the reaction is run at 172 °C and the dinitrogen is supplied at 0.88 atm. Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Round your answer to 2 significant digits. Clears your work. Undoes your last action. Provides information about entering answers.

Step 1: Convert 172 °C to Kelvin

We will use the following expression.

K = °C + 273.15

K = 172°C + 273.15 = 445 K

Step 2: Calculate the moles of N₂ consumed every second

We will use the ideal gas equation.

P × V = n × R × T

n = P × V/R × T

n = 0.88 atm × 505. L/(0.0821 atm.L/mol.K) × 445 K = 12 mol

Step 3: Calculate the rate of production of ammonia

Let's consider the balanced equation for the synthesis of ammonia.

N₂ + 3 H₂ ⇒ 2 NH₃

The molar ratio of N₂ to NH₃ is 1:2. The rate of production of ammonia is:

12 mol N₂/s × 2 mol NH₃/1 mol N₂ = 24 mol NH₃/s

Step 4: Convert the rate from mol/s to kg/s

We will use the following conversion factors:

[tex]\frac{24mol}{s} \times \frac{17.03 g}{1mol} \times \frac{1kg}{1000g} = 0.41kg/s[/tex]

The correct answer is: C. “Tina’s mother has severe FBAO. Tina should begin administering back blows followed by abdominal thrusts if the problem persists.”

Explanation: I did my study and took the test, this was right. :)