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Question 6
Plant cells have a strong, rigid outer layer known as the cell wall. The function of the cell wall is to -
help the cell maintain its shape under changing water pressure.
convert energy from sunlight into chemical energy.
regulate the transfer of material into the cell.
separate genetic material from the rest of the cell.
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Answer:

C). The previously known outcome of an observation or experiment can be used as solid proof that a newly-created scientific hypothesis is absolutely true.

Explanation:

A Scientific hypothesis is characterized as the proposed explanation or an educated guess about a natural phenomenon on the basis of previous knowledge as well as observation. All the given statements are true regarding a scientific hypothesis that it is 'an educated guess which explains the reason why a specific phenomenon occurs', 'being testable in a manner that could be replicated by other', 'an explanation for a natural phenomenon' except for that  the 'truth of a scientific hypothesis can never be assured completely with a solid proof as it always has chances of being expanded.' Thus, option C is the correct answer.

Answer:

\(4.75x10^{-3}mol\)

Explanation:

Hello!

In this case, since the Avogadro's number is a large one that help us to figure out 1 mole of any substance contains 6.022x10²³ particles, say atoms, molecules or ions, in this case, for the given amount of atoms of sulfur, the corresponding moles are obtain down below:

\(2.86x10^{21}atoms*\frac{1mol}{6.022x10^{23}}\\\\4.75x10^{-3}mol\)

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The concept half life is used here to determine the mass of 'A' remaining after 0.731 min. The rate constant of a reaction is defined as the rate of the reaction when the molar concentration of each of the reactants is unity. The mass of A remaining is 5.163 g.

The half life period of a reaction is defined as the time in which the concentration of a reactant is reduced to half of its initial concentration. The expression for half life period of a first order reaction is:

\(t _{1} /_{2} = 0.693 / k\)

k - rate constant

k = 0.693 / 0.0459 = 15.098 s

Divide by 60 to convert half life into minutes.

15.098 s = 0.251 minutes

The number of half lives that have past is:

0.731 min / 0.251 min = 2.912 ≈ 3

Initial mass / number of half lives = 15.49 / 3 = 5.163 g

Thus the mass of A remaining after 0.731 min is 5.163 g.

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Given:                                                                                                                      

Mass of Nitrogen (N₂) gas = 75 grams

Finding the number of moles of N₂:                                                                    

We know that the molar mass of N₂ is 28 grams/mole

Number of moles = Given mass / Molar mass

Number of moles = 75 / 28

Number of moles = 2.68 moles

Hence, there are 2.68 moles in 75 grams of Nitrogen Gas

First let's discover which element is oxidizing and which is reducing

So first let's rewrite the equation here:

Cr2O7^2- + C2O4^-2----> Cr^3+ + CO2

Reactant side:

oxidation state for Cr:

2x + (-2x7) = -2

x = +6

oxidation state for C:

2x + [4x(-2)] = -2

x = +3

Product side:

Cr - +3

oxidation state for C:

x + [2x(-2)] = 0

x = +4

Answer:

Wadding is a disc of material used in guns to seal gas behind a projectile or to separate powder from shot. ... Wadding for muzzleloaders is typically a small piece of cloth, or paper wrapping from the cartridge.

Explanation:

Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

Answer:

What's the gas given in the question??

isabel is represented as x

ruth is represented as x+2

so the equation would be

x+(x+2)=22

the (x+2) is ruth. so to check if its right solve it. 2x+2=22

-2 -2

2x+20

__ ___

2 2

x=10

so now you know that isabel scored 10 goals since she was x. to figure out ruth just add 2.

Answer:

A. Chemical potential to Kinetic energy

Explanation:

The car engine burns gas to produce motion. Burning is a form of chemical reaction and the motion produced is the kinetic energy.

Answer:

Explanation:

1/ I

2/ III

3/ V

4/ II

5/ IV

6/ 5

7/ 55

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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Answer:

(B. Plants and meat)

Explanation:

Answer:

3 - coefficient

2 subscripr

6 total #

cl- element symbol

We can determine the following based on the provided information:

Metal nitrate A is a compound that, when heated, transforms into colourless gas, brown gas B, and a metal oxide with a yellowish brown hue. B. C: Colourless petrol C. B: Brown petrol C. D: Compound D, a yellow precipitate produced by the reaction of potassium iodide with an aqueous solution of compound A.

We may deduce that A is probably lead nitrate (Pb(NO3)2) because lead is frequently used in soldering alloys and the metal contained in A is utilised in an alloy for soldering purposes.

Identifications:

Lead nitrate, or Pb(NO3)2,

N2O: Nitrogen dioxide

B: Carbon (CO)

D: PbI2, or lead iodide.

Thus, this can be concluded regarding the given scenario.

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Your question seems incomplete, the probable complete question is:

A metal nitrate A on heating gives a yellowish brown coloured metal oxide along with brown gas B and a colourless gas C. An aqueous solution of A on reaction with potassium iodide forms a yellow precipitate of compound D. Identify A, B, C and D. Also, identify the types of reactions taking place. Metal present in A is used in an alloy which is used for soldering purposes.

There would 60 g of Pu-239 after the first half life a 30g Pu-239 and  left after 3 half-lives is 7.5 g of Pu-239

Half life means the time required for half of something to undergo a process

Remind ourselves that radioactivity is defined as the process in which there is a spontaneous disintegration of a substance and in accordance of law of conservation mass that is mass is neither created nor destroyed when we have a radioactive process and as such nucleus as it is disintegrated forms daughter nuclei in which way mass is not lost

Then in this case I start out with 60 g of Pu-239 then 1 half-life is at 30g Pu-239 and after the 3 half-lives will have 7.5 g of Pu-239

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Answer:

Iron(II) fluoride

Explanation:

Iron(II) fluoride or ferrous fluoride is an inorganic compound with the molecular formula FeF2. It forms a tetrahydrate FeF2·4H2O that is often referred to by the same names.

Answer: Single Replacement

Explanation:

This reaction is single replacement because the Zinc pushes out the Copper from the CuCl2 to form ZnCl. This happens because Zinc is above Copper in the activity series.

Answer:

Hydrogen gases

Explanation:

Answer:

molecular hydrogen and helium

Explanation:

Answer:

B

Explanation:

Answer:

location a

Explanation:

Answer:

Location B

Explanation:

Answer:

Collaboration is the action of working with someone to produce or create something.

Explanation:

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CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen.

Intermolecular forces determine bulk properties, such as the melting points of solids and the boiling points of liquids.

Liquids boil when the molecules have enough thermal energy to overcome the intermolecular attractive forces that hold them together, thereby forming bubbles of vapor within the liquid.

CO₂ have a higher boiling point than CH₄ when they both possess dispersion forces because CO₂ consists of polar bonds between carbon and oxygen. The polarity increases the boiling point of the molecule.

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This is True, Social and emotional development is a developmental domain.

What is developmental domain?

The term "domain" when applied to human development describes particular facets of development and change. Language, social-emotional, cognitive, and physical development are the four basic areas of development.

Social-Emotional Domain is defined by forming relationships and attachments. A child's developing knowledge of and ability to manage their emotions is part of the social-emotional domain. Additionally, they start to recognize other people's emotions, become more cooperative, exhibit empathy, and engage in moral reasoning.

This category of developmental domains covers forming relationships with other people and learning social skills. Children gain skills including sharing, taking turns, and accepting others' differences. They also form a variety of relationships, including ones with their parents, siblings, peers, teachers, coaches, and members of the community.

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0.25 Molarity of lead nitrate aqueous solution is there when a solution of nacl is added slowly to  a solution of lead nitrate.

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Answer:

A.  1.88 mol H₂

B.  182 g Al₂(SO₄)₃

C.  54.8%

Explanation:

2 Al  +  3 H₂SO₄  ⇒  Al₂(SO₄)₃  +  3 H₂

A.  Convert grams of Al to moles.  The molar mass is 26.98 g/mol.

(33.8 g)/(26.98 g/mol) = 1.253 mol Al

Use stoichiometry to convert moles of Al to moles of H₂.  Looking at the equation, you can see that for every 2 mol of Al consumed, 3 moles of H₂ is produced.  Use this relationship.

(1.253 mol Al) × (3 mol H₂)/(2 mol Al) = 1.879 mol H₂

You will produce 1.88 mol of H₂ gas.

B.  Again, use stoichiometry.  For every 3 moles of H₂SO₄ consumed, 1 mole of Al₂(SO₄)₃ is produced.

(1.60 mol H₂SO₄) × (1 mol Al₂(SO₄)₃/3 mol H₂SO₄) = 0.533 mol Al₂(SO₄)₃

Convert moles of Al₂(SO₄)₃ to grams.  The molar mass is 342.15 g/mol.

(0.533 mol) × (342.15 g/mol) = 182.48 g Al₂(SO₄)₃

You will produce 182 g of Al₂(SO₄)₃.

C.  Calculate percent yield by dividing the actual yield by the theoretical yield.  Multiply by 100%.

(100.0/182.48) × 100% = 54.8%

The percent yield is 54.8%.