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3 years ago

Answer my my science homework please

Chemistry

1 answer:

ludmilkaskok [199]3 years ago

5 0

1. D

2. 83.5 million years ago - 66 million years ago

3. It had armor and could rotate to keep its caudal bludgeon facing the enemy.

hope this helped :)
alisa202

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What volume does .0685 mol of gas occupy at STP? 1mole =22.4

GuDViN [60]

V = nRT/P
V = 0.685 mol*(.0821 L*atm/K*mol)*273 K/1 atm

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3 years ago

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Muszę napisać wzór sumatryczny wysyłam załącznik

ioda

Cześć, nie mówię po polsku, więc zrobiłem to w Tłumaczu Google, więc przepraszam, jeśli coś brzmi śmiesznie.

chlor (VII) i tlen - ten wzór to $CI_{2} O_{7}$ , a tlenek chloru jest bezwodnikiem kwasu nadchlorowego.

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Mam nadzieję, że to pomoże, błogosławionego i cudownego dnia! :-)

-Cutiepatutie

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4 years ago

. Give an example of a salt that is less soluble when the temperature increases

77julia77 [94]

Answer:

cerium (iii) sulfate is less soluble

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3 years ago

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Which of the following best describes a mixture in which ionic compounds are dissociated in solution?

Ierofanga [76]

Ion solution is correct. hope it helps

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4 years ago

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As with other ionic compounds, potassium bromate, KBrO3, dissociates into ions when it dissolves in water. If 13.8 g of KBrO3 is

chubhunter [2.5K]

Answer:

ΔH of dissociation is 38,0 kJ/mol

Explanation:

The dissociation reaction of KBrO₃ is:

KBrO₃ → K⁺ + BrO₃⁻ 

This dissolution consume heat that is evidenced with the decrease in water temperature.

The heat consumed is:

q = CΔTm

Where C is specific heat of water (4,186 J/mol°C)

ΔT is the temperature changing (18,0°C - 13,0°C = 5,0°C)

And m is mass of water (150,0 mL ≈ 150,0 g)

Replacing, heat consumed is:

q = 3139,5 J ≡ 3,14 kJ

13,8 g of KBrO₃ are:

13,8 g×(1mol/167g) = 0,0826 moles

Thus, ΔH of dissociation is:

3,14kJ / 0,0826mol = 38,0 kJ/mol

I hope it helps!

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3 years ago