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2 years ago

HELP please. Only if your POSITIVE

Chemistry

1 answer:

tatuchka [14]2 years ago

7 0

Answer:

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.

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Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas.

Phoenix [80]

The correct answer is option B, that is, hypothesis.

A hypothesis refers to an anticipated illustration for an occurrence. It refers to a proposed illustration or a supposition made on the groundwork of inadequate proof as an initiation point for further investigation. In order for a hypothesis to be a scientific hypothesis, the scientific method needs that one can examine it.

6 0

3 years ago

Read 2 more answers

Nucleic acids are chains of 5-carbon sugars linked by ____ bonds with an organic base protruding from each sugar.

Mekhanik [1.2K]

<span>B) phosphodiester </span> is the correct answer

3 0

3 years ago

What volume of oxygen (in L) is produced

sveticcg [70]

Answer:

12.36 L.

Explanation:

We'll begin by calculating the number of mole in 147.1 g of lead(II) nitrate, Pb(NO₃)₂. This can be obtained as follow:

Molar mass of Pb(NO₃)₂ = 207.2 + 2[14.01 + (16×3)]

= 207.2 + 2[14.01 + 48]

= 207.2 + 2[62.01]

= 207.2 + 124.02

= 331.22 g/mol

Mass of Pb(NO₃)₂ = 147.1 g

Mole of Pb(NO₃)₂ =?

Mole = mass / Molar mass

Mole of Pb(NO₃)₂ = 147.1 / 331.22

Mole of Pb(NO₃)₂ = 1.104 moles.

Next, we shall determine the number of mole of oxygen gas, O₂, produce from the reaction. This can be obtained as follow:

2Pb(NO₃)₂ —> 2PbO + 4NO₂ + O₂

From the balanced equation above,

2 moles of Pb(NO₃)₂ decomposed to produce 1 mole of O₂.

Therefore, 1.104 moles of Pb(NO₃)₂ will decompose to produce = (1.104 × 1)/2 = 0.552 mole of O₂.

Finally, we shall determine the volume occupied by 0.552 mole of oxygen gas, O₂. This can be obtained as follow:

1 mole of O₂ occupied 22.4 L at STP.

Therefore, 0.552 mole of O₂ will occupy = 0.552 × 22.4 = 12.36 L at STP.

Thus, the volume of oxygen gas, O₂ produced is 12.36 L.

6 0

3 years ago

PLS HELP Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred t

Vitek1552 [10]

Answer: In simplest case mass of reactants is same as mass of products.

Without thinking this question deeper, mass of ZnCl2 would be 49, but..

Explanation: Reaction should be Zn + 2 HCl ⇒ ZnCl2 + H2

Amount of zinc is 5 g / 65,38 g/mol = 0,076476 mol and amount

of Hydrogen Chloride is 50 g / 36.458 g/mol = 1,371 mol.

Althought HCl is needed 0.152 moles, zinc is an limiting reactant.

So it is possible to produce only 0.076476 mol Hydrogen and its mass

is 0.154 g. Mass of ZnCl2 would be 0.076476 mol · (65.38 + 2·35.45) =

10.42 g

4 0

3 years ago

Balance the chemical equation<br> _CrO3->_Cr2O3+_O2

snow_lady [41]

Answer:

2CrO3-->2Cr2O3--->3O2

7 0

2 years ago