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3 years ago

Help !!! pretty please ❤️

Chemistry

1 answer:

sammy [17]3 years ago

7 0

Answer:

Al⁺³ has 10 electrons.

Fe⁺³ has 23 electrons.

Mg⁺² has 10 electrons.

Sn⁺² has 48 electrons.

Co⁺² has 25 electrons.

Co⁺³ has 24 electrons.

Li⁺¹ has 2 electrons.

Cr⁺³ has 21 electrons.

Rb⁺¹ has 36 electrons.

Pt⁺² has 76 electrons.

Explanation:

To find the total number of electrons for an ion, you need to take the atomic number and subtract the charge of the ion from it, if the charge is positive.

For example, let's do Al⁺³. Aluminum has an atomic number of 13. The charge is +3. The total number of electrons is 10.

13 - 3 = 10

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What is the specific heat of copper when heated to 221.32

Dafna1 [17]

Answer:

The specific heat of copper when heated to 221.32 (not listed form of heat measurement) is 221.32 (not listed form of heat measurement).

Explanation:

uh not really sure what else there is here, I may be missing something

5 0

3 years ago

Calculate the heat absorbed by a sample of water that has a mass of 45.00 g when the temperature increases from 21.0oC to 38.5 o

Elenna [48]

Answer:

The heat absorbed by the sample of water is 3,294.9 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

The sensible heat of a body is the amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous). Its mathematical expression is:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Q=?
m= 45 g
c= 4.184 $\frac{J}{g*C}$
ΔT= Tfinal - Tinitial= 38.5 C - 21 C= 17.5 C

Replacing:

Q= 4.184 $\frac{J}{g*C}$ * 45 g* 17.5 C

Solving:

Q=3,294.9 J

The heat absorbed by the sample of water is 3,294.9 J

8 0

3 years ago

How is primary selection different from secondary succession?

PIT_PIT [208]

Answer:

Explanation:

Primary and secondary succession occur after both human and natural events that cause drastic change in the makeup of an area. Primary succession occurs in areas where there is no soil and secondary succession occurs in areas where there is soil.

In primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area previously occupied by living things is disturbed—disrupted—then recolonized following the disturbance.

Hope this helped :)

-Akito

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3 years ago

The reaction below shows how silver chloride can be synthesized.

Vesna [10]

$AgNO_{3} _{(aq)} + NaCl_{(aq)} ----\ \textgreater \ NaNO_{3} _{(aq)} + AgCl _{(aq)}$
mole ration of $AgCl _{(aq)} : AgNO_{3} _{(aq)}$ = 1 : 1

∴ if moles of $AgNO_{3} _{(aq)}$ = 15.0 mol
then " " $AgCl _{(aq)}$ = 15.0 mol

∴ the Option 2 is the answer.

5 0

4 years ago

Read 2 more answers

A combustion reaction is one type of what class of reactions?

ivanzaharov [21]

It is a. oxidation-reduction

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3 years ago