TRUE OR FALSE:

Most living organisms are composed of cells

Answer:

D 4

Explanation:

32g/mol of oxygen is O2

64g/mol of oxygen is 2*32= 2O2

Balancing the reaction gives

4H2 + 2O2 => 4H2O

That is 4 moles of water

The number of water molecules produced is equal to 4 mol when the reaction starts with 64 grams of oxygen. THerefore, option (D) is correct.

A mole can be described as an international standard unit that is used to determine a given count of particles. The particles counted are generally chemically entities, individually distinct.

A mole can calculate a large number of quantities of molecules, atoms, ions, or other particular particles. The amount of chemical substance can be defined as a measure of elementary entities of a substance in a given sample.

The number of entities present in one mole can be described as equal to 6.023 × 10 ²³ is also known as Avogadro’s constant.

Given the chemical equation of water formation:

[tex]2H_2 + O_2 \longrightarrow 2H_2O[/tex]

Given, the mass of oxygen gas = 64 g

The number of moles of oxygen gas = 64/32 = 2 mol

From the chemical equation, we can say that one mole of oxygen gas forms two moles of water molecules.

2 moles of oxygen gas will water molecules = 2 ×2 = 4 mol

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Answer:

V2 = 2.79

Explanation:

T1 = 15C = 288.15K

P1 = 1 atm

V1 = 2.58L

T2 = 38C = 311.15K

P2 = 1 atm

V2 = ?

311.15 x 1 x 2.58 ÷ 288.15 ÷ 1 = V2

V2 = 2.79 L

So 2.79 L is the answer!!

Answer:

b. cost to implement conservation policies

Explanation:

Answer: Urbanization implications

Environmental implications

Benefit vs The cost

Explanation:

Conservation involves preservation of organisms and their natural habitat to encourage biodiversity and reduces the risk of extinction.

Urbanization involves the loss of organism’s natural habitat due to deforestation and building of more structures such as buildings and road structures. Government must consider before passing conservation policies if the urbanization will have a bigger impact than conservation.

Environmental implications is also taken into account as the environment is where we live and makes it very important to ensure there are no negative effects.

The benefit and cost are weighed and the one with a lower cost and higher benefit is usually embraced.

Answer:

carbon dioxide nd water

Explanation:

mark brainliest

Claim 2 is correct as during the chemical reaction, the rust and another substance were produced.

This is defined as two or more substances being converted to new substances known as products.

The reaction between iron pipes and the fertilizer will lead to the formation of products such as rust and another substance. The people of Westfield may likely have compounds such as Sodium nitrite in their water.

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Answer:

D

Explanation:

The temperature increases

Answer:

17.8 grams

Explanation:

The mass of  Na₂SO₄ produced is 35.5g

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Mass of NaOH = 10 g

Molar mass of NaOH = 23 + 16 + 1 = 40

Molar mass of NaSO = (23 × 2) + 32 + (4 × 16) = 142

                      Moles = mass ÷ molar mass

moles of NaOH = 10 ÷ 40

                           = 0.25

From the reaction, 1 mole of NaOH gives 1 mole of Na₂SO₄.

Thus, 0.25 moles of NaOH gives 0.25 moles of Na₂SO₄.

Mass of Na₂SO₄.  = 0.25 × 142

                              =35.5g

Therefore, the mass of  Na₂SO₄ produced is 35.5g

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Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.

Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.

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Answer:

In displacement reactions

Explanation:

Answer:

D. Ester

Polyesters are defined as (snooze alert!) long-chain polymers chemically composed of at least 85 percent by weight of an ester and a di-hydric alcohol and a terephthalic acid. The term refers to many (poly) esters (the building block compound—many fats and fragrances are esters).

Manufactured cellulose fibers come from plants that are processed into a pulp and then extruded in the same ways that synthetic fibers like polyester or nylon are made. Rayon or viscose is one of the most common "manufactured" cellulose fibers, and it can be made from wood pulp.

Answer:

5.55 mol

Explanation:

1 mole of any substance is equal to 6.022 × 10²³. So, if we do

3.34 x 10^24 * 1 / 6.022 × 10²³ is equal to 5.55 mol.

The chemical reaction will be NaF

Answer:

2Na + F_2

Here Sodium is taken in solid form and Fluorine is taken as gaseus

Answer:

Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options

Explanation:

Answer:

B.

Explanation:

An ammonia solution contains only a few ions, and it conducts electricity only poorly.

The best way to represent the concentration of a 1.75 m K₂CrO₄ solution is [K₂CrO₄] = 1.75M.

Concentration of any substance will give idea about the quantity of that substance present in given volume.

Concentration will be express in many ways like molarity, molality, mole fraction and so on. And to express the quantity in concentration we will use the big square closed bracket like this [ ].

Hence, best way is [K₂CrO₄] = 1.75M.

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Answer:

B.

Explanation:

The maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g

From the question, we are to determine the maximum mass of anhydrous zinc chloride that could be obtained

From the given balanced chemical equation,

ZnO + 2HCl → ZnCl₂ + H₂O

This means 1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂ and 1 mole of H₂O

From the given information

Number of moles of ZnO = 0.0830 mole

Now, we will calculate the number of moles of HCl that is present

Volume of HCl added = 100 cm³ = 0.1 dm³

Concentration of the HCl = 1.20 mol/dm³

Using the formula,

Number of moles = Concentration × Volume

Number of moles of HCl present = 1.20 × 0.1 = 0.120 mole

Since

1 mole of ZnO will completely react with 2 moles of HCl to produce 1 mole of ZnCl₂

Then,

0.06 mole of ZnO will react with the 0.120 mole of HCl to produce 0.06 mole of ZnCl₂

Therefore, maximum number of moles of anhydrous zinc chloride that could be produced is 0.06 mole

Now, for the maximum mass that could be produced

Using the formula,

Mass = Number of moles × Molar mass

Molar mass of ZnCl₂ = 136.286 g/mol

Then,

Mass = 0.06 × 136.286

Mass = 8.17716 g

Mass ≅ 8.18 g

Hence, the maximum mass of anhydrous zinc chloride that could be obtained from the products of the reaction is 8.18 g

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This is really simple. Assuming all these reactions are stoichiometric, the ratios of moles if always given by:

[tex] \frac{n {}^{} }{x} = \frac{n}{y} [/tex]

The first n represents the number of moles of the first reactant.

The x represents the coefficient of the first reactant in the equation.

The second n represents the number of moles of the second reactant.

The y represents the coefficient of the second reactant.

For example, let's use the first equation:

[tex] \frac{n \: n {}^{2} }{1} = \frac{n \: h {}^{2} }{3} [/tex]

Using cross multiplication;

[tex]3n \: n {}^{2} = 1n \: h {}^{2} [/tex]

For each H² mole, we need 3 N² moles

Ratio of N² to H² is 3:1

Hope this given you an idea of how to continue the rest.

If you get stuck you can always comment so i can help you.

Make sure to tell me what you get as your answers so you get a good grade :)

Answer:

Density of water is 1, mass of 1000 divide by the volume of 1000 gram in a liter is 1

Explanation:

i hope this helps :)

Answer:

[tex]1.90[/tex] [tex]moles[/tex]

Answer:

c. 640.51

Explanation:

Given: 2.54 cm = 1 inch weighed 3.88 ounces

1 g = 0.035273 ounces

?   = 3.88 ounces

? = (3.88 x 1) / 0.035273

? = 109.999 = 110 g

110 g = 3.88 ounces

2.54 cm = 110 g

14.79 cm = ?

? = (14.79 x 110) / 2.54

? = 640.51 g

According to unit conversion, there are 640.51 g would a 14.79 cm length of same iron rod weigh.

Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.

It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.

Given: 2.54 cm = 1 inch weighed 3.88 ounces,1 g = 0.035273 ounces

x  = 3.88 ounces

x= (3.88 x 1) / 0.035273

x = 109.999 = 110 g

110 g = 3.88 ounces

Thus,2.54 cm = 110 g

14.79 cm = x

x= (14.79 x 110) / 2.54

x = 640.51 g

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Answer:

c.

Explanation:

The mass of propane, C₃H₈ that will vaporise as a result of absorbing 100 KJ of energy is 280.25 g

1 mole of propane C₃H₈ = (3×12) + (1×8) = 44 g

From the question given above,

15.7 KJ of heat energy vaporised 44 g of propane.

Therefore,

100 KJ of heat energy will vaporise = (100 × 44) / 15.7 = 280.25 g of propane

Thus, 280.25 g of propane were vaporised from the tank.

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The net ionic equation for potassium fluoride and ammonium chloride is

NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)

Generally, The net ionic equation can simply be defined as a chemical equation that records solely those species experiencing the reaction.

Therefore,  net ionic equation for potassium fluoride and ammonium chloride

NH_4Cl(aq) and KF(aq) are both salys

Therefore, the ionic equation excludes them and is

NH_4^++F^-(aq)--->NH_3(aq)+HF(aq)

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Answer:b

Explanation:

Both devices work because of electromagnetic induction, which is when a voltage is induced by a changing magnetic field.

Answer:

A

and B

Explanation: hope this helps, pls mark brainliest.

Answer:

B.

Explanation:

I just did the edge nuity assignment

Answer:

a and d but were in America so d

Answer: "Minerals the necessity of human use are extracted from ores."

Explanation:

An ore can be defined as a natural sediment or rock which comprises of one or more kinds of necessary minerals. The minerals typically comprises of either metals or non-metals. The ores are extracted from the deep earth layers by the mining process. The ores are refined and treated by smelting. In this process the heat is applied to the ores to extract the metals. The metals are of great economic importance without conducting mining and extraction processes no one can get metals. Metals are used for making cans, metal wires, gadgets and others.

''Minerals are extracted from ores which can be used by human."

Ore is a natural rock or sediment which is deposit in Earth's crust that consist of one or more valuable minerals. The most valuable ore deposits contain metals that is important to industry and trade like copper, gold, aluminium and iron etc. These minerals can be extracted from the soil by using different types of methods and machineries.

These minerals can be used in making various products as well as sold directly to other countries at high price which contributes in the economy of the country so we can conclude that minerals are very important for the economy of a country.

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Answer:

A

Explanation:

2 has 4, 3 and 4 both have 2.

(if 3 had a decimal point it would have 3 sig figs)

The mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.

Mass is defined as the inertia, a fundamental feature of all stuff, is quantified.

It is also defined as a dimensionless quantity that represents the mass of a particle or object.

Mass can be expressed as

Mass = density x volume

Significant figure is defined as a number in positional notation is a set of digits that may be relied on to signify the quantity of anything.

It can also be defined as the amount of significant single digits from 0 to 9 in the coefficient of the expression that accurately conveys the meaning.

Thus, the mass measurement contains a total of three significant figures is 22.0 g. Thus option A is correct.

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