The nucleus of an atom ok K-42 contains

Questiu What quantity of gas, in moles, is contained in 3.22 L at STP?

Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 40.0 % of an Am-241 sample to decay? Express your answer with the appropriate units.

4 Suzanna notices that when she rolls a marble on the carpet, the marble slows down and stops. What force causes the marble to change its motion? How does this force act?

What water temperature is utilized when a frostbitten part must be rewarmed (select one) ?

At the top of a high mountain, the weight of an object is: greater than at sea level less than at sea level the same as that at sea level

Student follow up The ionic equation for the reaction between zinc and sulfuric acid is. Zn (s) + 2H (aq) - - Zn" (aq) + H2 (g) a State what has been oxidised in this reaction. Explain your answer in terms of electrons.

What kind of group 1 atoms are the most reactive? a. Small atoms c. Atoms with the most electrons in the valence level b. Large atoms d. Atoms at the top of the periodic table

What does it mean when there are 2.3 x 10-4 moles?

Electric force is an A. attraction and repulsion between protons and electrons . B. attraction and repulsion between protons and neutrons. C. attraction and repulsion between neutrons and electrons.

A salt crystal has a mass of 0.18 mg. how many nacl formula units does it contain?