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3 years ago

Applying a force for a longer time increases the change in

Chemistry

1 answer:

morpeh [17]3 years ago

3 0

Answer:

velocity and momentum

Explanation:

as you exert force, the object accelerates, hence, its velocity increases.

since momentum is mass times velocity, the momentum increases too

Please be reminded, this answer may not be 100% correct

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What is all three states of matter?

Karo-lina-s [1.5K]

Solid, Liquid, and Gas

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3 years ago

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What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? Hint: The pKa of phosphate is 6.86.

AlekseyPX

Answer:

The pH value of the mixture will be 7.00

Explanation:

Mono and disodium hydrogen phosphate mixture act as a buffer to maintain pH value around 7. Henderson–Hasselbalch equation is used to determine the pH value of a buffer mixture, which is mathematically expressed as,

$pH=pK_{a} + log(\frac{[Base]}{[Acid]})$

According to the given conditions, the equation will become as follow

$pH=pK_{a} + log(\frac{[Na_{2}HPO_{4} ]}{[NaH_{2}PO_{4}]})$

The base and acid are assigned by observing the pKa values of both the compounds; smaller value means more acidic. NaH₂PO₄ has a pKa value of 6.86, while Na₂HPO₄ has a pKa value of 12.32 (not given, but it's a constant). Another more easy way is to the count the acidic hydrogen in the molecular formula; the compound with more acidic hydrogens will be assigned acidic and vice versa.

Placing all the given data we obtain,

$pH=6.86 + log(\frac{0.058}{0.042})$

$pH=7.00$

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3 years ago

Give an example of when carbon can displace a metal from its compounds and when it cannot?

RUDIKE [14]

Answer:

If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.

Explanation:

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3 years ago

In general, the atomic radius of an atom _______ as you move down a column in the periodic table? increases decreases increases

Tom [10]

Tomic radius INCREASES as you go DOWN a Group because each successive Period (row) has an additional occupied energy level. you can think of it this way: each time you drop down a row, you add a "ring."

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4 years ago

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Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g kno3 and 295 ml of water. The density of water

Tanzania [10]

Answer: the percent by mass of potassium nitrate is 13.3%

Explanation:

1) Data:

Mass of solute, m₁ = 45.0 g

Volume of solvent, V₂ = 295 ml

density of water, d₂ = 0.997 g/ml

2) Formulae:

Percent by mass, % = (mass of solute / mass of solution) × 100

Density, d = mass / volume

3) Solution:

d = mass / volume ⇒ m₂ = d₂ × V₂ = 0.997 g/ml × 295 ml = 294. g

mass of solution = m₁ + m₂ = 45.0g + 294. g = 339. g

% = (45.0 g / 339. g) × 100 = 13.3 %

The answer has to be reported with 3 significant figures.

6 0

3 years ago