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iragen [17]
3 years ago
14

What’s a test you can give to show the difference between metal and gold

Chemistry
1 answer:
DENIUS [597]3 years ago
7 0

Answer:

An Acid Test

An acid test is any qualitative chemical or metallurgical assay which uses acid ( most commonly), and historically, the use of a strong acid to distinguish gold from base metals.

Explanation:

I hope it helps

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The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has
neonofarm [45]

Answer:

Option A. It has stayed the same.

Explanation:

To answer the question given above, we assumed:

Initial volume (V₁) = V

Initial temperature (T₁) = T

Initial pressure (P₁) = P

From the question given above, the following data were:

Final volume (V₂) = 2V

Final temperature (T₂) = 2T

Final pressure (P₂) =?

The final pressure of the gas can be obtained as follow:

P₁V₁/T₁ = P₂V₂/T₂

PV/T = P₂ × 2V / 2T

Cross multiply

P₂ × 2V × T = PV × 2T

Divide both side by 2V × T

P₂ = PV × 2T / 2V × T

P₂ = P

Thus, the final pressure is the same as the initial pressure.

Option A gives the correct answer to the question.

3 0
3 years ago
HELP ME || WILL MARK BRAINLEST ||Which product could contain a substance formed by Reaction B?
lawyer [7]

Answer:

Antacid

Explanation:

Hope this helps:)

7 0
3 years ago
Read 2 more answers
A student performs an experiment similar to what you will be doing in lab, except using titanium metal instead of magnesium meta
Genrish500 [490]

Answer:

n = 0.0022 mol

Explanation:

Moles is denoted by given mass divided by the molar mass ,  

Hence ,  

n = w / m  

n = moles ,  

w = given mass ,  

m = molar mass .  

From the information of the question ,

w = 0.108 g

As we known ,

The molar mass of titanium = 47.867 g / mol

The mole of titanium can be caused by using the above relation , i.e. ,

n = w / m  

n = 0.108 g / 47.867 g / mol

n = 0.0022 mol

7 0
3 years ago
How many moles of electrons are required to reduce one mole of bromine gas (Br2) to two moles of bromide ions (Br-)? 1 e- 2 e- 3
rosijanka [135]
The correct answer would be the second option. It would would need 2 moles of electrons to reduce one mole of bromine gas into two moles of the bromide ions. This is a reduction reaction. It would be written as:

Br2 = 2Br- + 2e-
8 0
3 years ago
The reaction of Fe3O4(s) with hydrogen(g) to form iron(s) and water(g) proceeds as follows: Fe3O4(s) + 4 H2(g) 3 Fe(s) + 4 H2O(g
Reptile [31]

Answer:  151 kJ

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}  

\text{Moles of} Fe_3O_4=\frac{61.8g}{231.5g/mol}=0.267moles

Fe_3O_4(s)+4H_2(g)\rightarrow 3Fe(s)+4H_2O(g)

It is given that:

0.267 moles of Fe_3O_4 absorb energy = 40.3 kJ

Thus 1 mole of Fe_3O_4 absorb energy =\frac{40.3}{0.267}\times 1=151kJ  

Thus the value of \Delta H for the chemical equation given is 151 kJ

4 0
3 years ago
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