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3 years ago

13

Can somebody plz answer both questions correct!!! Only answer in 1-2 sentences.. that’s fine :)

2 answers:

Lynna [10]3 years ago

7 0

Answer:

a chemical change is usually an irreversible chemical reaction. an example of this is rusting.

a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.

Explanation:

BartSMP [9]3 years ago

7 0

1. A chemical change is a change in the arrangement of the atoms of one or more substances and a change in their composition or properties. Example: the formation of rust on iron

2. With a physical change no new substance is produced only a change in size, shape, color or state of the matter.

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Objects 1 and 2 collide and stick together. Which best describes the momentum of the resulting single object? It is less than th

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Answer:

The answer would be D

Explanation:

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A force of 100 newtons is applied to a box at an angle of 36º with the horizontal. If the mass of the box is 25 kilograms, what

notka56 [123]

Answer:

$a_x=4.944m/s^2$

Explanation:

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Based on the acting force that is applied horizontally, one can propose the following equation based on Newton's laws:

$F=ma$

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$F=macos\theta$

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3 years ago

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Naddik [55]

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3 years ago

The reaction of hydrogen and iodine to produce hydrogen iodide has a Kc of 54.3 at 703 K. Given the initial concentrations of H2

pentagon [3]

Answer:

[HI] = 0.7126 M

Explanation:

Step 1: Data given

Kc = 54.3

Temperature = 703 K

Initial concentration of H2 and I2 = 0.453 M

Step 2: the balanced equation

H2 + I2 ⇆ 2HI

Step 3: The initial concentration

[H2] = 0.453 M

[I2] = 0.453 M

[HI] = 0 M

Step 4: The concentration at equilibrium

[H2] = 0.453 - X

[I2] = 0.453 - X

[HI] = 2X

Step 5: Calculate Kc

Kc = [Hi]² / [H2][I2]

54.3 = 4x² / (0.453 - X(0.453-X)

X = 0.3563

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[I2] = 0.453 - 0.3563 = 0.0967 M

[HI] = 2X = 2*0.3563 = 0.7126 M

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