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Rasek [7]
3 years ago
9

A large bar of solid gold is melted into liquid. The liquid is then poured into molds to make a number of gold coins. Was this a

chemical or physical change? Explain
Chemistry
1 answer:
Kobotan [32]3 years ago
8 0

Answer:

it's physical change because none of the components of the bar of solid have been tampered with so solid to liquid is physical change

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For the reaction 8 H 2 S ( g ) − ⇀ ↽ − 8 H 2 ( g ) + S8 ( g ) 8H2S(g)↽−−⇀8H2(g)+S8(g) the equilibrium concentrations were found
Eva8 [605]

Answer:

Kc = 826

Explanation:

For the equilibrium:

8 H₂S (g)        ⇄   8 H₂(g)   + S₈ (g)

the equilibrium constant is:

Kc = [ H₂ ] ⁸ x [ S₈ ] /  [H₂S]⁸

Kc = 0.600⁸ x 0.750 / (0.250)⁸ = 1.68 x 10⁻² x 0.750 / 1.53 x 10⁻⁵

                                                =  824

Be careful with raising to the power of 8 in your calculator.

7 0
3 years ago
Where the use of energy is concerned (in scientific sense),when is work done?
Schach [20]
<span>Work is done only when the applied force is able to displace any object through certain distance. So, energy is concentrated on certain object that is to be displaced.</span>
6 0
4 years ago
A neutralization reaction between an acid and a metal hydroxide produces
Vikki [24]

Answer:

A neutralization reaction between an acid and a metal hydroxide produces salt and water.

Explanation:

In a neutralization reaction, an acid and a base are combined according to the following example (hydrochloric acid and sodium hydroxide):

HCl + NaOH ---> H20 + NaCl

They are generated as products: water and a salt, in this case sodium chloride.

3 0
4 years ago
Formulate a hypothesis about the stoichiometry of the reaction between NaCl and AgNO3.
MAXImum [283]

Answer:

AgCl + NaNO3 would be the products of the reaction between sodium chloride and silver nitrate.

The stoichiometry of this reaction is written below, and it is because for this reaction to be fulfilled the products have to be in equilibrium with the reactants, since the mass in the reaction is conserved and must be balanced in the amount of molecules that they react to each other.

Explanation:

NaCl + AgNO3 -------------- AgCl + NaNO3

3 0
4 years ago
Help please thank you​
nata0808 [166]
C. F, Br, Cl, At
Explanation: you can see the periodic table
7 0
3 years ago
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