3 years ago

Please help me!! I’m confused and this teacher doesn’t know how to teach.

Chemistry

1 answer:

Marianna [84]3 years ago

8 0

Answer:

chemical change bcoz it cannot be in the past form

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3 points

vfiekz [6]

Answer:

density=6.74g/ml

:320g÷47.5ml

d=6.74g/ml

thank you

I hope this is helpful

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3 years ago

Quiz

Nat2105 [25]

The rate at which radioactive decay occurs & how much radioactive decay has occurred

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3 years ago

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Which is a binary ionic compound? A.MgCl2 B.C6H12O6 C.CO2 D.PO43- E.CH4

SSSSS [86.1K]

The answer is A MgCI2

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3 years ago

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Small quantities of oxygen can be prepared in the laboratory by heating potassium chlorate, KClO 3 ( s ) . The equation for the

Pavlova-9 [17]

Answer:

Mass of $O_2$ produced = 32 g

Explanation:

Calculation of the moles of $KClO_3$ as:-

Mass = 82.4 g

Molar mass of $KClO_3$ = 122.55 g/mol

The formula for the calculation of moles is shown below:

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

Thus,

$Moles= \frac{82.4\ g}{122.55\ g/mol}$

$Moles= 0.67237\ mol$

From the reaction shown below:-

$2KClO_3\rightarrow 2KCl+3O_2$

2 moles of potassium chlorate on reaction forms 3 moles of oxygen gas

So,

0.67237 moles of potassium chlorate on reaction forms $\frac{3}{2}\times 0.67237$ moles of oxygen gas

Moles of oxygen gas = 1 mole

Molar mass of oxygen gas = 32 g/mol

Mass of $O_2$ produced = 32 g

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4 years ago

How many particles of atoms are in 155 grams of silicon

sergeinik [125]

Answer:

5,948

Explanation:

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3 years ago