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2 years ago

2. What are some common properties of metals, nonmetals, and semimetals?

Chemistry

2 answers:

a_sh-v [17]2 years ago

6 0

Answer:

malleable, shiny, hard and good electricity conductors

german2 years ago

4 0

Answer:

iron is a metal, plastic is a non metal

Explanation:

one has properties of metal and the other doesn't

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An iron nail rusts when exposed to oxygen. According to the following reaction, how many moles of iron(III) oxide will be formed

Zigmanuir [339]

Answer:

0.453 moles

Explanation:

The balanced equation for the reaction is:

2Fe(s) + 3O2(g) ==> 2Fe2O3

From the equation, mass of O2 involved = 16 x 2 x 3 = 96g

mass of Fe2O3 involved = [(2x26) + 3 x 16] x 2

= 100g

Therefore 96g of O2 produced 100g of Fe2O3

32.2g of O2 Will produce 100x32.2/96

= 33.54g of Fe2O3

Converting it to mole using number of mole = mass/molar mass

but molar mass of Fe2O3 = 26 + (16 X 3)

= 74g/mole

Therefore number of mole of 33.54g of Fe2O3 = 33.54/74

= 0.453 moles

5 0

3 years ago

a. Order the following liquids in order from least dense to most dense: Dish Soap, Rubbing Alcohol, Milk, Corn Syrup.

Anettt [7]

dish Soap,Corn Syrup,Rubbing Alcohol, Milk,

7 0

2 years ago

Puzzle: A man stands on a road in Iowa looking up at the night sky. On one night he sees the constellation Orion. But on another

nasty-shy [4]

Answer:

altho I don't believe in supper stision I would say that Scorpius has killed Orion.

5 0

2 years ago

How many moles are present in 63.80L of oxygen gas, O2?

matrenka [14]

Answer:

2.85moles of oxygen gas

Explanation:

Given parameters:

Volume of oxygen gas = 63.8L

Unknown:

Number of moles = ?

Solution:

We assume that the gas is under standard temperature and pressure. To find the number of moles, use the expression below:

1 mole of a gas at STP occupies a volume of 22.4L

So;

63.8L of oxygen gas will take up a volume of

$\frac{63.8}{22.4}$ = 2.85moles of oxygen gas

4 0

3 years ago

Consider the decomposition of hydrogen peroxide reaction. If the rate of decomposition of hydrogen peroxide at a particular temp

Natasha2012 [34]

Answer:

0.049 mol/L.s

Explanation:

The decomposition of hydrogen peroxide is:

$H_2O_2 \to H_2O + \dfrac{1}{2}O_2$

$Rate = -\dfrac{\Delta [H_2O_2]}{\Delta t}= \dfrac{\Delta [H_2O_2]}{\Delta t}= \dfrac{ 2 \Delta [H_2O_2]}{\Delta t}$

The rate of decomposition reaction = the rate of formation of $H_2O$ = 0.098 mol/L.s

∴

Rate of formation of $O_2$ $= \dfrac{ rate \ of \ reaction }{2}$

$= \dfrac{ 0.098 }{2}$

= 0.049 mol/L.s

8 0

3 years ago