Which of the following elements ia an alkali metal?

A. potassium

B. calcium

C. chromium

D. germanium

What is the energy of a photon of green light with a frequency of 5.76 times 10 to the fourteenth s to the negative one

Water has a higher specific heat index than other common materials, so it takes a lot of energy to raise the temperature of water Conclude how this would affect climate. A) Areas surrounded by water would have more snow.

If 0.5 gramd of hcl is dissolved in 500 ml of solution what is the ph

What type of reaction occurs between Mg and HCl and explain why?

what is the density of a substance that has a mass of 2.0 g, and when placed in a graduated cylinder the volume rose from 70 mL to 75 mL

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g

What two elements make up dihydrogen monoxide?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves