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alexira [117]
3 years ago
13

Which of these statements best describes a similarity between combustion and respiration?

Chemistry
2 answers:
hodyreva [135]3 years ago
8 0
Both respiration and combustion can produce carbon dioxide. Therefore, of the answers in your list only the third one is correct.
LenaWriter [7]3 years ago
8 0

Answer:  Both release carbon dioxide into the atmosphere.

Explanation:  Combustion is a process  which releases carbon dioxide and water in the presence of oxygen .

For eg-   Combustion of methane in presence of oxygen will lead to the release of the carbon dioxide and water.

               CH_{4} + O_{2}\rightarrow CO_{2} + H_{2}O

Respiration is the process taking place in living organism which involves the production of the energy. It is mainly proceeded in the body through lungs with the intake of the oxygen and release of the carbon dioxide.

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The volume of 7.91 M HCl needed to make 196.1 mL of 2.13 M HCl is ____.
Alona [7]

Answer:

a. 52.8

Explanation:

To find the number of moles of HCl we use the relation M₁V₁=M₂V₂

where M₁ is the initial molarity, M₂ the new molarity, V₁ the initial volume used, and V₂ the final volume obtained.

M₁=7.91 M

M₂=2.13 M

V₁=?

V₂=196.1 mL

Replacing these values in the relationship.

M₁V₁=M₂V₂

7.91 M× V₁=2.13 M×196.1 mL

V₁=(2.13 M×196.1 mL)/7.91 M

=52.8 mL

3 0
3 years ago
Help ASAP!!! I need it now i have to write similar test tmrw
dusya [7]
A is Ea, which stands for activating energy. Energy is needed to get the reaction underway and Ea is the energy needed to “start” the reaction.

B is the temperature either released or absorbed.

The diagram shows that the reaction is exothermic based on the fact that the products energy is lower than the reactants. That is because energy (which is temperature in this case) is released during the process. If the reactants would have been lower than the products, the reaction would be endothermic.
3 0
2 years ago
Read 2 more answers
Explain how the heat and phase changes affects the environment? Give examples.<br>(5-7 sentences)​
NeX [460]
Energy is required to change the phase of a substance, such as the energy to break the bonds between molecules in a block of ice so it may melt.
During a phase change energy my be added or subtracted from a system, but the temperature will not change. The temperature will change only when the phase change has completed. No temperature change occurs from heat transfer if ice melts and becomes liquid water (i.e., during a phase change). For example, consider water dripping from icicles melting on a roof warmed by the Sun. Conversely, water freezes in an ice tray cooled by lower-temperature surroundings. Energy is required to melt a solid because the cohesive bonds between the molecules in the solid must be broken apart so that the molecules can move around at comparable kinetic energies; thus, there is no rise in temperature.
7 0
2 years ago
PLEASE HELP
otez555 [7]

Answer:

P2≈393.609Kpa so I think the answer is 394 kPa

Explanation:

PV=mRT Ideal Gas Law

m and R are constant because they dont change for the problem. That means

PV/T=mR = constant

so P1*V1/T1=P2*V2/T2 and note that the temperatures are in absolute temperatures (Kelvin) because you can't divide by zero.

So P2 = P1*V1*T2/(V2*T1) = 101325 Pa * 700 mL * 303K/(200 mL*273K)

P2 = 393609 Pa

5 0
3 years ago
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Which of the following elements does not form a diatomic molecule?
gladu [14]

Answer:

C

Explanation:

Neon is a noble gas, which is monoatomic.

6 0
3 years ago
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