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3 years ago

If you hold a backpack in your hand, the force of gravity pulls it downward. What force keeps it from falling to the ground?

Chemistry

1 answer:

Deffense [45]3 years ago

7 0

Answer:

The force of the gases pushes downward at the same time that the gases push the rocket upwards. 1.

Explanation:

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How much heat is evolved when 1260 g of water condenses to a liquid at 100.°C?

Paul [167]

Moles H2O = 1233 g/ 18 g/mol=68.5 68.5 x 40.7 =2788 kJ

8 0

3 years ago

Read 2 more answers

If the balanced chemical reaction for the formation of Li2O is 4 Li(s) + O2(g) → 2 Li2O(s), how many molecules of Li2O(s) would

Marta_Voda [28]

The molecules of Li₂O that would produce if you used up 6 atoms of Li(s) is 3.

<h3>What is Lithiumdioxide?</h3>

It is an unstable inorganic and radical compound, used in the manufacture of glass and ceramic.

The balanced equation

$\rm 6 Li(s) + O_2(g) \rightarrow 3 Li_2O(s)$

If the atoms of lithium moves up to 6 the lithium oxide molecules will be 3, as you can see in the equation.

Thus, the molecules of Li will be 3.

Learn more about lithium dioxide

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5 0

3 years ago

Can someone please help me

Alona [7]

Answer:

Potassium iodide increases the decomposition rate of hydrogen peroxide.

Explanation:

Potassium iodide increases the decomposition rate of hydrogen peroxide because potassium iodide act as a catalyst. A catalyst speed up the process of chemical reaction without reacting with the molecules present in reaction. If the potassium iodide is not present as a catalyst for the decomposition of hydrogen peroxide then the decomposition of hydrogen peroxide takes too much time because the catalyst is absent that speed up the reaction.

5 0

3 years ago

18.A 2.50 L sample of dry air in a cylinder exerts a pressure of

Vlada [557]

Answer:

$\boxed{\text{7.50 L}}$

Explanation:

The temperature and amount of gas are constant, so we can use Boyle’s Law.

$p_{1}V_{1} = p_{2}V_{2}$

Data:

$\begin{array}{rclrcl}p_{1}& =& \text{3.00 atm}\qquad & V_{1} &= & \text{2.50 L} \\p_{2}& =& \text{1.00 atm}\qquad & V_{2} &= & ?\\\end{array}$

Calculations:

$\begin{array}{rcl}3.00 \times 2.50 & =& 1.00V_{2}\\7.500 & = & 1.00V_{2}\\V_{2} & = &\textbf{7.50 L}\\\end{array}\\\text{The volume of the gas is } \boxed{\textbf{7.50 L}}$

4 0

3 years ago

One would not expect yeast to undergo fermentation in the presence of

Hunter-Best [27]

Answer:

Oxygen.

Explanation:

Hello,

Yeast fermentation in the food industry must be carried out under anaerobic conditions as long as when oxygen is present respiration occurs rather than fermentation.

Best regards.

3 0

3 years ago