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3 years ago

PLS HELP URGENT I WILL MAKE BRAINLY AND LIKE FIVE STARS

Chemistry

1 answer:

Gala2k [10]3 years ago

8 0

Chemical to radiant: Turning on a battery operated light.

Gravitational to kinetic: A child going down a slide on a playground.

Elastic to kinetic: A boy shooting a rubber band across the classroom.

Chemical to thermal: Using a gas power heater to warm a room.

Electrical to radiant: Using the light in your room that is plugged into a wall.

Kinetic to thermal: Rubbing your hands together to warm them on a cold day.

Electrical to kinetic: Using a DC electric motor.

Kinetic to electric: Using a hand crank generator to produce electric current.

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3 years ago

Heating 2.40 g of the oxide of metal X (molar mass of X = 55.9 g/mol) in carbon monoxide (CO) yields the pure metal and carbon d

Korolek [52]

Answer:The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

Explanation:

Let the molecular formula of the oxide of metal be $X_2O_y$

$X_2O_y+yCO\rightarrrow yCO_2+2X$

Mass of metal product = 1.68 g

Moles of metal X = $\frac{1.68 g}{55.9 g/mol}=0.03005 mol$

1 mol of metal oxide produces 2 moles of metal X.

Then 0.03005 moles of metal X will be produced by:

$\frac{1}{2}\times 0.03005 mol=0.01502 mol$ of metal oxide

Mass of 0.01502 mol of metal oxide = 2.40 g (given)

$0.01502 mol\times (2\times 55.9 g/mol+y\times 16 g/mol)=2.40 g$

y = 2.999 ≈ 3

The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

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3 years ago

what do all word equations start with? what comes next in the word equation? how is the word equation concluded ?

Sladkaya [172]

They start with the numbers u need to know in order to slove the problem and there has to be a story behind it

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3 years ago

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erastovalidia [21]

The answer is 'equal'. Hydroxide ions are OH- and Hydrogen ions are H+. Have you noticed they're opposite charges? Positive + negative = neutral. That's all there is to it :)

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3 years ago