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IrinaVladis [17]
3 years ago
15

A compound containing oxygen and group 16 and/or group 17 elements contains one of the following elements. The compound dissolve

s in water. Which element does
the compound contain?
A. Magnesium
B. Potassium
C. Barium
D. Strontium
Chemistry
2 answers:
Igoryamba3 years ago
7 0
Pretty sure the answer is B
Sphinxa [80]3 years ago
3 0

Explanation:

pottassium  its one of covalent bond

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commercial cold packs consist of solid NH4NO3 and water. In a coffee-cup calorimeter, 5.60g NH4NO3 is dissolved in 100g of water
fgiga [73]

Answer:

-1.37 kJ/mol

Explanation:

The expression for the calculation of the enthalpy of dissolution of [tex[NH_4NO_3[/tex] is shown below as:-

\Delta H=m\times C\times \Delta T

Where,  

\Delta H  is the enthalpy of dissolution of [tex[NH_4NO_3[/tex]

m is the mass

C is the specific heat capacity

\Delta T  is the temperature change

Thus, given that:-

Mass of ammonium nitrate = 5.60 g

Specific heat = 4.18 J/g°C

\Delta T=17.9-22.0\ ^0C=-4.1\ ^0C

So,  

\Delta H=-1.25\times 4.18\times 3.9\ J=-95.9728\ J

Negative sign signifies loss of heat.  

Also, 1 J = 0.001 kJ

So,  

\Delta H=-0.096\ kJ

Also,

Molar mass of [tex[NH_4NO_3[/tex] = 80.043 g/mol

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Thus,

Moles= \frac{5.60\ g}{80.043 \ g/mol}

Moles= 0.06996\ mol

Thus, \Delta H=-\frac{0.096}{0.06996}\ kJ/mol=-1.37\ kJ/mol

6 0
4 years ago
The substance that is doing the dissolving is referred to as?
ella [17]

Answer:

hi! I'm pretty sure your answer is solvent!

Explanation:

not 100% sure but I looked it up on google. solvent does the dissolving, solute is what is being dissolved, and a solution is the solvent + the solute. hope this helped!

7 0
4 years ago
Blood is forced through the body by the
belka [17]
Blood is pumped throughout the body by your heart.  Your heart is the main organ responsible for blood circulation.
8 0
4 years ago
The proton number of barium (Ba) is 56. It is in Group II of the periidic table how many electrons would you expect a barium ato
ella [17]

Answer:

A barium atom would be expected to contain 2 electrons in its outer energy level.

Explanation:

The columns of the periodic table are called groups. There are eighteen groups, numbered from 1 to 18.

The elements of each group have the same number of electrons in their last atomic shell, which is why they have similar chemical properties, because the chemical properties of chemical elements are strongly related to the electrons located in the last atomic shell.

That is, in a group, the chemical properties are very similar, because all the elements of the group have the same number of electrons in their last or last shells.

<u><em>A barium atom would be expected to contain 2 electrons in its outer energy level.</em></u>

7 0
3 years ago
Complete the paragraph to describe the characteristics of the Sun and Rigel, a blue-white supergiant.
sammy [17]

Answer:

bigger than.

a higher temperature.

11.0k

Explanation:

just did it

3 0
3 years ago
Read 2 more answers
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