CHEMISTRY HIGH SCHOOL

PLEASE HELP!! Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
5.1 – 2.3685 = [?]
PLEASE HELP!! Perform the following mathematical operation, and report the - 1

Answers

Answer 1
Answer:

Answer: 2.7 is the real answer if you follow the right rules!
Answer 2
Answer:

Answer:

5.1 - 2.3685 = 2.7315 \n

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A student blows up a balloon, seals it tightly, and places it in a very cold freezer. After a few hours, the balloon has gotten smaller. Which of the following statements best explains the decrease in the balloon’s volume? the multiple choice a. As the temperature decreases, the molecules gain energy and move closer together, causing the balloon to shrink. b.As the balloon releases energy, the molecules break apart into atoms, causing the balloon to shrink. c.As the temperature decreases, the molecules lose energy and move closer together, causing the balloon to shrink. d.As the balloon absorbs energy, the molecules move more quickly, causing the balloon to shrink.

Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table?The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.
The alkali metal atom forms a +2 ion, while the alkaline earth metal atom forms a +1 ion.
The alkali metal atom has one less shell of electrons than the atom of the alkaline earth metal.
The alkali metal atom has one more shell of electrons than the atom of the alkaline earth metal.

Answers

Answer: The alkali metal atom forms a +1 ion, while the alkaline earth metal atom forms a +2 ion.

Explanation: Group 1 elements are called as alkali metals and group 2 elements are called as alkaline earth metals.

For example, Li is an alkali metal and Be is an alkaline earth metal.

Lithium(Li) has an atomic number of 3 and the electronic configuration is:

Li: 1s^22s^1

Thus lithium has to lose 1 electron and acquire 1+ charge to attain nearest noble gas configuration.

Li^+:1s^2

Berrylium(Be) has an atomic number of 4 and the electronic configuration is:

Be: 1s^22s^2

Thus berrylium has to lose 2 electrons and acquire 2+ charge to attain nearest noble gas configuration.

Be^(2+):1s^2

Answer:

a

Explanation:

Light energy used for photosynthesis is absorbed by ____ found in plant cells.mitochondria
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chlorophyll
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Answers

Light energy used for photosynthesis is absorbed by chlorophyll found in plant cells. Chlorophyll, the green substance found in a plant's chloroplasts, is what gives the plant its pigmentation. It is also the one that absorbs light energy in order for photosynthesis to proceed. Light energy converts CO2 and water into glucose, the food used by plants.

What is true about the dilution of a solution?The amount of solute decreases.
The volume remains the same.
The amount of solvent increases.
The concentration increases.

Answers

The amount of solvent increases, since the solvent is the one diluting the solution, the more you want your solution diluted, the more of solvent you'd use. :)

How much energy is required to raise 10.0 grams of water (c=4.18j/gC) by 20*C?

Answers

Answer:

Q = 836 J

Explanation:

Given data:

Mass of water = 10.0 g

Temperature increased =ΔT = 20°C

Specific heat  capacity of water = 4.18 J/g.°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Q = 10.0 g × 4.18 J/g.°C  × 20°C

Q = 836 J

Ice is nlaced in hot water What happens to the temperature of the ice and the water?

Answers

When ice is placed in hot water the hot water loses its own heat while the cold water from the ice gets heat.

Answer:when you add ice to hot water, the ice melts while the hot water cools. The exchange of heat energy from the hot water causes the ice to melt.

Explanation:

Hope this helped :)

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Answers

The Charles and Boyles law,is a gas law that says that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. If you increase the pressure 10 times, the volume will decrease 10 times. You have a fixed mass of gas, so n (the number of moles) is constant. R is always constant - it is called the gas constant. Boyle's Law demands that temperature is constant as well.
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