Which of the following is a polyatomic ion?

A. Calcium, Ca2+

B. Carbide, C4-

C. Sulfate, SO4

D. Selenide, Se2-

A 12.8 g sample of ethanol (C2H5OH) is burned in a calorimeter with a heat capacity of 5.65 kJ/°C. Assume the heat from the sample is negligible compared to the calorimeter.

What element has an atomic number of 20 and two valence electrons in its valence shell?

Use trigonometric identities to solve tan (2theta) + tan (theta) = 0 exactly for 0 Basically u r finding all possible answers for the question

What is the ka reaction of hcn? the ka of hcn is 6.2 à - 10-10. what is kb value for cnâ€" at 25°c?

One acid-base theory states that an acid is (1) an electron donor (3) an H + donor (2) a neutron donor (4) an OH - donor

The ksp of lead (ii) hydroxide, pb (oh) 2, is 1.43 * 10-20. calculate the solubility of this compound in g/l.

On earth, the weight of an object changes. TrueFalse

When 5 grams of KCl are dissolved in 50. grams of water at 25°C, the resulting mixture can be described as (1) heterogeneous and unsaturated (2) heterogeneous and supersaturated (3) homogeneous and unsaturated (4) homogeneous and supersaturated

How have water & wind shaped Earth's Surface?

Convert 14 kilograms to pounds