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2 years ago

Will give brainliest if you answer quickly and correctly :)

Chemistry

2 answers:

joja [24]2 years ago

5 0

Answer:

C. I (iodine)

Explanation:

it would be Iodine because it has 5 energy levels of electrons and has a total of 74 neutrons inside its nucleus!

Hope this helps, have a good day!

AnnZ [28]2 years ago

3 0

I think it’s I
Iodine has 53 protons and 74 neutrons

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What is the name of the molecule that is used to heat most of our buildings? (Chemistry)

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Answer:

Fluids (air/water) either as water vapour or oxygen and carbon dioxide.

Explanation:

Heat transfer occurs through conduction, convection or radiation.

Many aties, this involves fluids whose molecules have been activated by heated by heat, moving from hotter to cooler regions, allowing for heating or cooling of the rooms.

Building materials have varying conductivity.

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2 years ago

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2 years ago

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A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder

Zina [86]

a)Exothermic

b) it goes up

c) The piston must move out

d)The energy is released by the system

e)ΔE = -616 kJ

Explanation:

sign convention for heat flow:

if the heat flows into the system it is marked with positive sign

when the heat flows out the system it is marked with negative sign

sign convention for work

if work is done on the system it is marked positive

if work is done by the system it is marked negative

sign convention for internal energy

if energy absorbed by system mark positive

if energy released by system mark negative

the heat flow flowing out of the system (q= -300 kJ)

thus the reaction is Exothermic

In exothermic reaction, heat flows from the system to surroundings.

surrounding here is water bath.

As the system is exothermic, hence the temperature of water bath goes up

It is given that 316 kJ of work is done by the system, applying expansion.

To maintain constant pressure of 1 atm the decreased pressure can be compensated with an increase on volume . To increase volume the piston must move out

According to 1st law of thermodynamics,

ΔE =q +w ⇒1

here,

ΔE = q +w

ΔE = -300 kJ -316 kJ

ΔE = -616 kJ ⇒2

the negative sign denotes the energy is released by the system

from ΔE = -616 kJ the amount of energy released by the reaction is ΔE = -616kJ

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3 years ago

Identify the element in period 3 to most likely have similar chemical properties to Ca.

sweet [91]

Answer: The element having similar chemical properties that of calcium present in period 3 is magnesium.

Explanation:

In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.

Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.

We are given:

Calcium is the 20th element of the periodic table having electronic configuration $1s^22s^22p^63s^23p^64s^2$

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Hence, the element having similar chemical properties that of calcium present in period 3 is magnesium.

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3 years ago