What is the difference between endothermic and exothermic reactions?

Answers

Answer 1

Answer: Endothermic take in energy.
Exothermic give out energy.

I remember it by imaging that the energy is either 'ENtering' or 'EXiting'.

Hope this helps.

Answer 2

Answer:

Final answer:

Endothermic reactions absorb energy from the environment and make it cooler, such as photosynthesis in plants, while exothermic reactions release energy into the environment and make it hotter, like burning wood in a fireplace.

Explanation:

Endothermic and exothermic reactions are different in terms of energy absorption and release. In an endothermic reaction, energy in the form of heat is absorbed from the surroundings into the system (reaction). This causes the environment to become cooler. An example would be the process of photosynthesis in plants.

In contrast, an exothermic reaction releases energy into the surroundings. As a result, the environment around an exothermic reaction heats up. An example of an exothermic reaction is combustion, such as the burning of wood in a fireplace.

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Which of these period three elements from the periodic table would you predict to be the MOST metallic? A)Al
B)Ar
C)Cl
D)Si

Answers

Al, since it is the only metal in that list

A is obiviously the answer here.

How much energy does a 9 x 10-8 m wavelength photon have?A. 5.96 x 10-41 j

B. 2.21 x 10-18 j

C. 7.36 x 10-27

D. 1.988 x 10-49 J

Answers

Answer:

Explanation:

From the given formukar for energy of a photon, we can obtain the energy of the photon as shown in the image. The meaning of the parameters in the equation are also shown in the image.

Answer: 2.21 x 10^-18 j

Explanation: a pex

Tissues combine to form …A cells
B organs
C organ systems
D organisms

Answers

Answer:

B Organs

Explanation:

Cells come together to form tissue Tissue comes together to for Organs Organs come together to form Organ Systems Organs Systems come together to form Organisms

Which has a larger atomic radius Be or Ba

Answers

Ba has the larger atomic radius

A 5.00 L sample of air at 0 C is warmed to 100.0 C. What is the new volume of the air? First, identify V1.

Answers

Answer : The new volume of the air is, 6.83 L

Explanation :

Charles' Law : It states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$(V_1)/(T_1)=(V_2)/(T_2)$

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

$V_1=5.00L\nT_1=0^oC=(0+273)K=273K\nV_2=?\nT_2=100^oC=(100+273)K=373K$

Putting values in above equation, we get:

$(5.00L)/(273K)=(V_2)/(373K)\n\nV_2=6.83L$

Therefore, the new volume of the air is, 6.83 L

What differs between a radioactive isotope and a stable isotope?A. Stable isotopes are shorter
B. Radioactive Isotopes last for less time
C. Radioactive isotopes last longer.
D. There is no difference

Answers

A radioactive isotope is emitting particles such as a fast moving electron or positron (radiation) and this is changing its structure. Eventually it may reach a stable configuration and will no longer decay. An stable isotope is simply a name for a form of an element which is chemically identical to other atoms of the element but with a different number of neutrons. I hope this helps!

Radioactive isotopes last for less time, is the one among the following choices given in the question that shows the way a radioactive isotope and a stable isotope differs

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