No. Wulfenite has a hardness of 2.75-3.0 on the Mohs scale, so it is not hard enough to make a gem out of it.
Wulfenite is a very popular and highly sought-after mineral by collectors. It isused as a minor ore of lead and molybdenum.
<span>Reaction of combustion ( CH4 ) :
</span><span>CH4 + 2 O2 = CO2 + 2 H2O
</span><span> </span>↓ ↓<span>
1 mole CH4 produced 2 moles of H2O
hope this helps!
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Answer:
Number of neutrons: 44
Number of protons: 34
Number of electrons: 36
Explanation:
The atomic number of Se (Selenium) is 34
Mass number is 78
Number of neutrons = mass number - atomic number = 78 - 34 = 44
Number of protons is the same as the atomic number
Number of protons = 34
Selenium ion has a charge of -2. This means it accepts two more electrons
Number of electrons = atomic number + 2 = 34 + 2 = 36
Answer:
46.67 g
Explanation:
From the question given above, the following data were obtained:
Change in temperature (ΔT) = 23.8 °C
Heat (Q) = 261 J
Specific heat capacity (C) of silver = 0.235 J/gºC
Mass of silver (M) =?
The mass of the sample of silver can be obtained as follow:
Q = MCΔT
261 = M × 0.235 × 23.8
261 = M × 5.593
Divide both side by 5.593
M = 261 / 5.593
M = 46.67 g
Thus, the mass of the sample of silver is 46.67 g
