Give the number of significant figures in this number: 40

Which of these is a renewable resource? A) Gasoline that contains some alcohol B) Wind produced by the uneven heating of Earth's surface C) Natural gas pumped from deep underground D) None of these

An average sample of coal contains 3.0% sulfur by mass. calculate the moles of sulfur present in 2.40 ' 103 kg of coal.

Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high

The rate of a reaction can be observed by measuring the change in the amount of a reactant over time, as given in the graph below. How does the rate of a reaction change with time and how does the collision theory explain this change?

A plane travel for about 2.5 hours at a velocity of 1200 km/hr east. What distance did it travel?

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

When gold is melted and formed in a mold to make a piece of jewelry, what type of change is taking place?