Which of the following equations demonstrates an actual chemical reaction that forms a new substance?

A1: ZN + 2HCl → 2NCl2 + H2

A2: H2O + NaCl → H2O

A3: Zn + Al + Cu → Zn + Cu + Al

A4: C12H22O11 + H2O → H2O + C12H22O11

Answer:For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion. For example, KCl, an ionic compound that contains K+ and Cl- ions, is named potassium chloride.

Explanation:

Answer:

See explanation

Explanation:

The molecular geometry of an atom is connected to the number of electron pairs that surround it(whether lone pairs or bonding pairs) as well as its hybridization state. We shall now examine the N, P, or S atoms in each of the following compounds.

a)

In H3PO4, P has a tetrahedral molecular geometry and is sp3 hybridized.

b) In NH4NO3

N is sp3 hybridized in NH4^+ and sp2 hybridized in NO3^-. Also, N is tetrahedral in NH4^+ but trigonal planar in NO3^-.

c) In S2Cl2, we expect a tetrahedral geometry but as a result of the presence of two lone pairs on each sulphur atom, the molecular geometry is bent. The sulphur is sp3 hybridized.

d) In K4[O3POPO3], each phosphorus atom is in a tetrahedral molecular geometry and is sp3 hybridized.

We are given:

Wavelength of Green light (λ) = 531 nm  OR   531 * 10⁻⁹ m

Speed of light (c) = 3* 10⁸ m/s

Solving for the Frequency of the wave:

We know the relation:

c = νλ    

(where ν is the frequency, c is the speed of light and λ is the wavelength)

3*10⁸ = ν*(531*10⁻⁹)

ν = 3*10⁸ / 531*10⁻⁹                  [dividing both sides by the wavelength]

ν = 3*10⁸*10⁹ / 531                   [ since a⁻¹ = 1/a]

ν = 3*10¹⁷ / 531                         [ since mᵃ * mᵇ = mᵃ⁺ᵇ]

ν = 10¹⁷ / 177

ν = 1000 * 10¹⁴ / 177                 [we split the numerator to simplify]

ν = 5.65 * 10¹⁴

Hence, the frequency of Green light is 5.65 * 10¹⁴ Hz

Answer:

f = 5.6×10¹⁴ Hz  

Explanation:

Given data:

Wavelength of green light = 531 nm (531×10⁻⁹ m)

Frequency of green light = ?

Solution:

Formula;

Speed of wave = wavelength × frequency

Speed of wave = 3.00×10⁸ m/s

by putting vales,

3.00×10⁸ m/s = 531×10⁻⁹ m × f

f = 3.00×10⁸ m/s / 531×10⁻⁹ m

f  = 0.0056×10¹⁷ s⁻¹

f = 5.6×10¹⁴ Hz    (Hz = s⁻¹)

Answer:

group. hfdzybidddiklllnjjooolll

Answer:

An organ system

Explanation:

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Answer:

a) Elements listed in rows on the periodic table are in the same family - false

Explanation:

Elements listed in groups /columns on the periodic table are in the same family.

The false statement is:

a) Elements listed in rows on the periodic table are in the same family.

In a periodic table, the elements are arranged in increasing order of atomic number. There are 7 periods and 18 groups in a periodic table.

The statement which is false is:

a) Elements listed in rows on the periodic table are in the same family.

The correct statement will be:

a) Elements listed in rows on the periodic table belongs to a different family.

These elements will have different properties and thus placed in periodic table.

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Answer:

C

that some of the mass was lost to the air as smoke

Answer:

C

Explanation:

A: Light isn´t part of the mass of magnesium, light is energy, it doesn´t occupate space.

B: Mass clearly have a relationship with matter, if you increase the amout of mass, you will increase the amout of matter, one way or another.

C: It is correct, some of the mass was lost because hot gases tend to go up.

D: Yes, the ash has a lower mass than magnesium, but it is not because ash is lighter or something like that. It is because some of the ash was lost due to the air.

A balanced chemical equation obeys the law of conservation of mass. In a balanced chemical equation the mass of the reactants and products are equal. The correct option is true.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called coefficients. They are found in front of formulas.

According to law of conservation of mass, mass can neither be created nor be destroyed. But it can be transformed from one form to another.

In a balanced chemical equation, the total mass of the reaction remains constant. The mass of the reactants before reaction is equal to the mass of products after reaction.

Thus the given statement is true.

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Answer:

B.

Explanation:

The two reactions shown in the attached image depicts the processes of photosynthesis and cellular respiration. Photosynthesis is the process whereby autotrophic organisms use CO2 (carbon dioxide) and H2O (water) in the presence of sunlight to make glucose (C6H12O6). The equation is as follows:

6CO2 + 6H2O + sunlight → C6H12O6 + 6O2

On the contrary is the process of cellular respiration, which involves the breakdown of glucose (sugar) in order to release energy (ATP). The equation is as follows:

C6H12O6 + 6O2 → 6CO2 + 6H2O + energy

According to this question, the option B which says that "Sugar is broken down to release energy" is CORRECT.

Answer:

8.51 x 10²¹ atoms

Explanation:

Given parameters:

Mass of K = 0.551g

Unknown:

Number of atoms = ?

Solution:

To find the number of atoms in this given substance, we need to solve for the number of moles first.

 Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

 Now;

     Molar mass of K  = 39g/mol

 Number of moles  = [tex]\frac{0.551}{39}[/tex] = 0.014mole

Therefore,

   1 mole of a substance contains 6.02 x 10²³ atoms

  0.014 mole of K will contain 0.014 x 6.02 x 10²³ = 8.51 x 10²¹ atoms

Answer:

You have to put equator in middle, trade winds on which ever side they are trading the items on, probaly north, and westerlies west, and jet streams around blue at the bottom, red at top and green in the middle.

Explanation:

I cant really explain it right because I don't know how to put the picture. I mean paste the picture on here

CAN YOU TELL ME HOW TO PUT PICTURE

Answer:

synthesis

Explanation:

hope this helps

The given reaction is a type of synthesis reaction.  

• The reactions, which takes place when two distinct molecules or atoms associate to produce a distinct molecule or compound is known as synthesis reactions.  

• The synthesis reactions are one of the prime categories of chemical reactions that comprise combustion reactions, single displacement, and double displacement reactions.  

• In synthesis reactions, energy is released and the reaction is exothermic, in some cases, endothermic is also possible.  

• In the given reaction atoms of phosphorus and oxygen combines to produce the compound phosphorus oxide.

Thus, the given case is an example of synthesis reaction.

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Answer:

hydrocarbons

Explanation:

hope this is right.. if not sorry:)

Answer:

I think it's tornado

Explanation:

Answer: should be d. then

(sorry if im wrong)

:(

i feel so stupi.d

(i changed my answer to d.)

The equilibrium concentration of H₂ : c. 9.55 x 10⁻³ M

Given

Kc = 54.6 at 425°C

The concentration of Hl = 0.0706 mol/L

Required

The equilibrium concentration of H₂ (and I₂)

Solution

[tex]\tt Kc=\dfrac{[HI]^2}{[H_2][I_2]}\\\\54.6=\dfrac{0.0706^2}{[H_2][I_2]}[/tex]

[H₂][I₂]=[H₂]²

[tex]\tt [H_2][I_2]=\dfrac{0.0706^2}{54.6}=[H_2]=9.55\times 10^-3~M[/tex]

The gas phase concentration of H2 and I2 is  9.55 x 10-3M.

The equation of the reaction is;

          H2      +       I2 ------>        2HI

We also have the information that the equilibrium constant of the process is  54.6.

Now recall that;

Kc = 2HI/[H2] [I2]

We can assume that the concentration of H2 = concentration of I2

Hence; [H2] = [I2] = x

54.6 = [0.0706]^2/x^2

54.6x^2 =  [0.0706]^2

x = √ [0.0706]^2/54.6

x = 9.55 x 10-3M

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Answer:

0

Explanation:

Ca has 20 electrons

Answer:

C. increase crop yields

Explanation:

Genetically modified organisms are those organisms that have been improved using genetic engineering procedures. Genetic engineering/modification is the manipulation of an organism's genome in order to get an improved organism with desirable traits.

The organisms being genetically modified or engineered is called GMO or transgenic organisms. Hence, in this case, one feature of the crops being genetically modified is to have an INCREASED YIELD.

Answer:

Screenshot

Explanation:

Answer:

D. It is extremely reactive.​

Explanation:

Hello!

In this case, since potassium is an alkali metal, it is known those are extremely reactive because the energy required to ionize them is very low, it means they react so easily. For instance, even in the presence of water, potassium is able to react and form a purple flame as a product of the reaction:

[tex]2K+2H_2O\rightarrow 2KOH+H_2[/tex]

As well as potassium, the rest of the elements belonging to the alkali metals series are extremely reactive; therefore the answer is D. It is extremely reactive.​

Best regards!

Answer:

I RFID not understand the question?

Answer:

The mass of O2 that will produce 10 g of Iron, Fe is 6.0 g

Note: The question is missing some details. The complete question is given below:

Blast furnaces extra pure iron from the iron (III) oxide in iron ore in a two step sequence. In the first step, carbon and oxygen react to form carbon monoxide 2C(s)+O2(e) -2CO(« In the second step, iron(III) oxide and carbon monoxide react to form iron and carbon dioxide Fe2O3(s) + 3 CO(g) → 2 Fe(s) + 3CO2(g) Suppose the yield of the first step is 90.% and the yield of the second step is 79.%. Calculate the mass of oxygen required to make 10 g of iron. Be sure your answer has a unit symbol, if needed, and is rounded to the correct number of significant digits.

Explanation:

Equation for the two reactions is given below:

Step 1: 2C(s) + O2(g) → 2CO(g)

Step 2: Fe2O3(s) + 3CO(g) → 2Fe(s) + 3CO2(g)

In the second step 3 moles of CO reacts to produce 2 moles of Fe

Molar mass of CO = 28 g/mol, molar mass of Fe = 56 g/mol

Therefore, 84 g (3 × 28) of CO will produce 112 g (2 × 56) of Fe

10 g of Fe will be produced by 84/112 × 10 g of CO = 7.5 g of CO

However, the actual yield is 79%, therefore, 7.5 g of CO will produce 0.79 × 10 g of Fe = 7.9 g of Fe

Mass of CO that will produce an actual yield of 10 g of Fe = 7.5/7.9 × 10 = 9.50 g of CO

From the first step:

1 mole of O2 reacts to produce 2 moles of CO (molar mass of O2 = 32 g)

32 g of O2 produces 56 g (2 × 28 g) of CO

Mass of O2 that will produce 9.50 g of CO = 32/56 × 9.50 g = 5.43g

However, since the actual yield is 90%, therefore, mass of CO produced = 0.9 × 9.50 = 8.55 g of CO

Mass of O2 that will produce 9.50 g of CO = 5.43/8.55 × 9.50 g = 6.03 g

Therefore, mass of O2 that will produce 10 g of Iron, Fe is 6.0 g

Answer:

f

Explanation:

Answer:

the answer is D to this question

The capability of a gaseous, solid or liquid component to dissolve in the solvent to yield a solution is called solubility. Solubility depends on the exterior area of the substance.

The correct answer is:

Option A. The finely ground sample because it has more surface area.

This can be explained as:

Therefore, the finely ground sample will dissolve fast.

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Answer:

17. D. Chemical change

18. C. Cell wall

19. D. To transfer matter and energy within and between organisms.

20. A. Transporting materials

21. C. Carbon dioxide

22. A. Cellular respiration

23. C. Produce food and give off oxygen

Explanation:

I have been able to supply the correct answers. The cell wall functions as a structure that provides structural support and protection to the cell. It is tough, flexible and at times rigid. In a chemical change, new materials with new properties are manufactured. So, the process of photosynthesis is a chemical change.

The endoplasmic reticulum actually transports material. It transports materials like protein and lipids made within the cell and sends it to where they are needed.

Carbon dioxide  is the the gas that animals give off and plants use it during photosynthesis. Cellular respiration involves the activities that result to the breaking down of food in order to release energy.

Answer:

1.02 × 10⁶ g

Explanation:

Step 1: Given data

Step 2: Convert "V" to L

We will use the conversion factor 1 m³ = 1000 L.

5400 m³ × 1000 L/1 m³ = 5.400 × 10⁶ L

Step 3: Convert "P" to atm

We will use the conversion factor 1 atm = 101325 Pa.

1.10 × 10⁵ Pa × 1 atm / 101325 Pa = 1.09 atm

Step 4: Calculate the moles of He (n)

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 1.09 atm × 5.400 × 10⁶ L / 0.08206 atm.L/mol.K × 280 K

n = 2.56 × 10⁵ mol

Step 5: Calculate the mass of He (m)

We will use the following expression.

m = n × M

m = 2.56 × 10⁵ mol × 4.002 g/mol

m = 1.02 × 10⁶ g

All objects, regardless of their mass, experience the same gravitational acceleration due to Earth's gravity (approximately 9.81 m/s^2 near the surface of the Earth).

Therefore, all objects will experience the same amount of gravitational attraction towards Earth. However, the force of gravity acting on an object is directly proportional to its mass, so a 5-gram pencil will experience the least amount of gravitational force (weight) compared to the other objects mentioned.

What is gravity?

Gravity is a fundamental force of nature that causes objects with mass to attract each other. It is one of the four fundamental forces of nature, along with electromagnetism, the strong nuclear force, and the weak nuclear force.

Gravity is responsible for the motion of objects in the universe, from the orbits of planets and moons around their parent bodies, to the formation of galaxies and the universe itself. The strength of the gravitational force between two objects depends on the mass of the objects and the distance between them. The larger the mass of the objects, the greater the gravitational force, and the closer the objects are to each other, the greater the gravitational force.

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Answer:

Pencil?

Explanation:

Doing test rn

Answer:

4.8× 10²³ atoms

Explanation:

Given data:

Number of moles of San element = 0.796 mol

Number of atoms present = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.796 mol ×  6.022 × 10²³ atoms / 1mol

4.8× 10²³ atoms

Answer:A. The deodorant evaporates as it absorbs thermal energy from James’s skin.

Explanation: