Which of these is considered a native element?

a. pyrite

b. galena

c. platinum

d. cinnabar

You have an unknown gas. When a glowing splint is placed in it, the splint goes out. Which gas (oxygen, carbon dioxide, or hydrogen) is it?

If an element contains 8 electrons how many electrons will be placed in the 2nd valence shell?

A 7.5 gram sample of zinc (specific heat = 0.390 J/g°C) is heated and then placed in a calorimeter containing 65.0 grams of water. The temperature of water increases from 20.00°C to 25.00°C. What was the initial temperature of the zinc?

The following reaction was performed in a sealed vessel at 760 ∘C : H2 (g) + I2 (g) ⇌2HI (g) Initially, only H2 and I2 were present at concentrations of [H2]=3.85M and [I2]=2.35M. The equilibrium concentration of I2 is 0.0500 M.

Which property is common to noble gases? A. Strong odor B. Low reactivity C. Brightly colored D. High reactivity

Eq-43 which type of fire extinguisher should be onboard a vessel with a permanently installed fuel tank

5. Identify a suitable method that would be used to separate mixture of the follow [b]Water and ethanol c]Table salt dissolved in water d] iodine and potassium Pul the table below

How much energy is needed to convert 57.3 grams of ice at 0.00°c to water at 75.0°c? specific heat (ice) = 2.10 j/g°c specific heat (water) = 4.18 j/g°c heat of fusion = 333 j/g heat of vaporization = 2258 j/g?

A certain first-order reaction (A→productsA→products) has a rate constant of 9.90*10-3 s-1s-1 at 45 ∘C∘C. How many minutes does it take for the concentration of the reactant, [A][A], to drop to 6.

Assign the oxidation number for (NH4) 3PO4