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kotegsom [21]
3 years ago
7

The total number of how many objects you have

Chemistry
1 answer:
valina [46]3 years ago
4 0
Can you explain more?
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13. The equation used to find acceleration is a =
lubasha [3.4K]

Acceleration represented by the equation = Δv/Δt.

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3 years ago
What type of energy must you add to a substance to make the particles of the substance
algol13

Answer: thermal  energy a}

Explanation:

Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other. The energy that comes from the temperature of the heated substance is called thermal energy.

3 0
3 years ago
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Water ionizes by the equationH2O(l)⇌H+(aq)+OH−(aq)The extent of the reaction is small in pure water and dilute aqueous solutions
tia_tia [17]

Explanation:

H_2O(l)\rightleftharpoons H^+(aq)+OH^-(aq)

The value of K_w :

K_w=[H^+][OH^-]

a. pOH = 3.51

The sum of pH and pOH is equal to 14.

pH + pOH = 14 (at 25°C)

pH = 14 - 3.51 = 10.49

The pH of the solution is defined as negative logarithm of hydrogen ion concentration in solution.

pH=-\log[H^+]

10.49=-\log[H^+]

[H^+]=3.2\times 10^{-11}

3.2\times 10^{-11} Mis the H^+ concentration for an aqueous solution with pOH = 3.51 at 25°C.

b.

At a certain temperature, the pH of a neutral solution is 7.56.

Neutral solution means that concentration of hydrogen ion and hydroxide ions are equal.

[H^+]=[OH^-]

7.56=-\log[H^+]

[H^+]=2.754\times 10^{-8} M

The value of K_w at at this temperature:

K_w=[H^+][OH^-]

K_w=[H^+][H^+]

K_w=(2.754\times 10^{-8})^2=7.6\times 10^{-16}

The value of K_w at at this temperature is 7.6\times 10^{-16}.

5 0
4 years ago
4) Calculate the percentage by<br> mass of oxygen in Pb(NO3)2<br> A) 193<br> B20<br> 145
Ierofanga [76]

Answer:

  im getting 331.23

Explanation:

Element Number Mass Percet Composition

O            6         16.00  28.9828819853274

N             2         14.01 8.45937867946744

Pb             1        207.21 62.5577393352051

5 0
3 years ago
In the diagram of the human digestive system, what organ is labelled 2?
MA_775_DIABLO [31]

Answer:

Stomach

Explanation:

The food you take travel through the Esophagus then into your stomach. Then digests through the intestine.

8 0
3 years ago
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