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3 years ago

How does the earth give us what we call and night

Chemistry

1 answer:

Elza [17]3 years ago

7 0

Answer:

the Earth rotates on an imaginary line called its axis and different parts of the planet are facing towards the Sun or away from it. it takes 24 hours for the world to turn all the way around, and we call this a day.

Explanation:

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Which can be changed when balancing a chemical equation, the coefficient or the subscripts? Why?

Nina [5.8K]

Coefficients need to be changed while balancing a chemical reaction beacuse subscript show how the molecule exists in nature

5 0

4 years ago

Read 2 more answers

Which .1 M solution has a pH greater than 7

ElenaW [278]

Answer:

KOH for which PH= 13

Explanation:

5 0

3 years ago

When 3.00 moles of hydrogen molecules and 1.50 moles of oxygen molecules react, they form 3.00 moles of water according to the r

Luden [163]

Answer:

The answer to your question is: 6 grams of hydrogen

Explanation:

Data

3.0 moles of hydrogen

1.5 moles of oxygen

3 moles of water

# of grams of hydrogen required to form 3 moles of water?

Equation

H₂ + 1/2 O₂ ⇒ H₂O

3 mole 1.5 moles 3 moles

Atomic weight of H₂ = 2 g

1 mole ----------------------- 2 g

3 moles --------------------- x

x = 3(2)/1 = 6 grams of hydrogens

3 0

3 years ago

The OAC simulation showed that warm air over a cold current:

tia_tia [17]

Answer:

received energy from water

4 0

3 years ago

If 842 grams of sodium hydroxide reacts with 750.0 grams of aluminum, how many grams of aluminum hydroxide should theoretically

Phantasy [73]

548.55 grams of aluminum hydroxide should theoretically form.

Explanation:

Balanced equation for the reaction:

3 NaOH + Al ⇒ Al(OH)3 +3 Na

DATA GIVEN:

mass of NaOH = 842 grams, atomic mass =39.9 grams/mole

mass of Al = 750 grams, atomic mass = 26.9 grams/mole

aluminum hydroxide theoretical yield = ?

Moles of NaOH reacted

number of moles = $\frac{mass}{atomic mass of 1 mole}$

putting the values in the equation

NaOH = $\frac{842}{39.9}$

= 21.1 MOLES OF NaOH

Al = $\frac{750}{26.9}$

= 27.8 moles

from the equation

from 3 moles of NaOH 1 mole of Al(OH)3 is produced

21.1 moles of NaOH will react to give x moles of Al(OH)3

$\frac{1}{3}$ = $\frac{x}{21.1}$

7.03 moles of Al(OH)3 is formed.

and

1 mole of Al(OH)3 is formed from 1 mole of Al in the reaction

so, 27.8 Moles will react to give give 27.8 moles of Al(OH)3 limiting reagent of the given reaction is NaOH

mass of Al(OH)3 =7.03 x 78 (atomic mass of Al(OH)3)

= 548.55 grams

theoretical yield from the given data is 548.55 grams

3 0

3 years ago