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3 years ago

What is a chemical change

2 answers:

5 0

Chemical change. ... a usually irreversible chemicalreaction involving the rearrangement of the atoms of one or more substances and a change in theirchemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

navik [9.2K]3 years ago

4 0

Isn't a chemical change like something that's not a physical change or physically changed but is something that uses natural chemicals? that's my guess sorry if it's wrong I think I'm wrong though

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qwelly [4]

Answer:

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Explanation:

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3 years ago

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What is the pH of a 0.300 M NH₃ solution that has Kb = 1.8 × 10⁻⁵ ? The equation for the dissociation of NH₃ is: NH₃ (aq) + H₂O

nalin [4]

Answer:

11.4

Explanation:

Step 1: Given data

Concentration of the base (Cb): 0.300 M

Basic dissociation constant (Kb): 1.8 × 10⁻⁵

Step 2: Write the dissociation equation

NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)

Step 3: Calculate the concentration of OH⁻

We will use the following expression.

$[OH^{-} ]=\sqrt{Kb \times Cb } = \sqrt{1.8 \times 10^{-5} \times 0.300 } = 2.3 \times 10^{-3} M$

Step 4: Calculate the pOH

We will use the following expression.

$pOH =-log[OH^{-} ]= -log(2.3 \times 10^{-3} M) = 2.6$

Step 5: Calculate the pH

We will use the following expression.

$pH+pOH=14\\pH = 14-pOH = 14-2.6 = 11.4$

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3 years ago

F liquid water runs into an open space within a rock, like a crack, and the temperature drops to the freezing point of water, wh

vodomira [7]

Answer:

b or c is the answer

Explanation:

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3 years ago

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What is the mass of 4.75 mol H2SO4

Over [174]

M(H2SO4)=n*M=4.75*98=465.5g

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3 years ago

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Ksenya-84 [330]

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