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3 years ago

What question can help u determine whether silver underwent is a chemical change or physical change

1 answer:

alexandr1967 [171]3 years ago

3 0

A question that can help you determine if silver underwent a chemical or psychic change is

1. is/has the substance changed? is it still the same or is it something completely new?
. if it is the same then its physical but if its not the same then its chemical.

.(ex:) if you cut up and paper into pieces then the substance hasn't changed because its still paper, just smaller xD this would be considered a psychic change.

.(ex:) if you burn a paper then the substance has change because its no longer paper/you can no longer write on it- this would be a chemical change.

another question would be

2. is it reversible? or not? (reversible- physical change) (not reversible - chemical change).

i hope that this kind of helps you.. xD sorry that its really long.

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Pure metals tend to be weaker and more reactive than an alloy which is a

Alex17521 [72]

Alloys are supposed to give greater strength to metals, which is why gold is mixed with others to make it harder. They have greater strength and are more resistant to erosion.

5 0

3 years ago

In a certain industrial process involving a heterogeneous catalyst, the volume of the catalyst (in the shape of a sphere) is 10.

olga nikolaevna [1]

Answer:

a. The second run will be faster.

d. The second run has twice the surface area.

Explanation:

The rate of a reaction is proportional to the surface area of a catalyst. Given the volume (V) of a sphere, we can find its surface area (A) using the following expression.

$A=\pi ^{1/3} (6V)^{2/3}$

The area of the 10.0 cm³-sphere is:

$A=\pi ^{1/3} (6.10.0)^{2/3}=22.4cm^{2}$

The area of each 1.25 cm³-sphere is:

$A=\pi ^{1/3} (6. 1.25)^{2/3}=5.61cm^{2}$

The total area of the 8 1.25cm³-spheres is 8 × 5.61 cm² = 44.9 cm²

The ratio of 8 1.25cm³-sphere to 10.0 cm³-sphere is 44.9 cm²/22.4 cm² = 2.00

Since the surface area is doubled, the second run will be faster.

6 0

3 years ago

The solubility of Cr(NO3)3⋅9H2O in water is 208 g per 100 g of water at 15 ∘C. A solution of Cr(NO3)3⋅9H2O in water at 35 ∘C is

Zinaida [17]

Answer:

102g of crystals

Explanation:

When the Cr(NO₃)₃⋅9H₂O is dissolved in water at 15°C, the maximum mass that water will dissolve in the equilibrium is 208 g per 100g of water. When you heat the water, this mass will increases.

In this problem, at 35°C the water dissolves 310g in 100g of water, as in the equilibrium at 15°C the maximum mass is 208g, the mass of crystals that will form is:

310g - 208g = <em>102g of crystals</em>

<em>-Crystals are the Cr(NO₃)₃⋅9H₂O that is not dissolved-.</em>

I hope it helps!

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3 years ago

Name the following Compound: CrF2

pav-90 [236]

Chromium(II) fluoride

8 0

2 years ago

Only positive ions have a charge. true or false?

Elis [28]

Answer:

true

Explanation:

5 0

3 years ago