Which substance represents a compound? (1) C (s) (3) CO (g) (2) Co (s) (4) O2 (g)

Which planet in our solar system is closest to the sun? A) Jupiter B) Earth C) Mercury D) Saturn

The element with the greatest density is osmium, which has adensity of 22.6g / cm3 Calculate the mass of 32.1cm2 osmium.

A wireless computer network uses radio waves to transmit signals. What device sends and receives radio signals in a wireless network? A) modem B) router C) digital translator D) digital interpreter

Which base has the lowest ionization constant (Kb) ? A) HCl B) NaOH C) bleach D) blood

Safrole was once used as a flavoring in root beer, until it was banned in 1960. what is the vapor pressure of a solution prepared by dissolving 0.75 mol of nonvolatile safrole in 950 g of ethanol (46.07 g/mol) ? p°ethanol = 50.0 torr at 25°c.

We are all familiar with the general principles of operation of an internal combustion engine: the combustion of fuel drives out the piston.

A first order reaction has a rate constant of 0.816 at 25 oC. Given that the activation energy is 22.7 kJ/mol, calculate the rate constant at 34 oC. (enter answer to 3 decimal places)

Part b select the ester that is formed when propanoic acid reacts with isopropyl alcohol in the presence of heat and an acid catalyst.

Do metals form anions or cations

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon