Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. Is the star moving towards or away from us, or can we not tell?

Which statement best describes a solution containing a strong base? A. the solution is dilute B. The solution is concentrated C. a small amount of the base dissociates in solution D nearly all of the base dissociates in solution

A solid precipitate is formed from the reaction of lead nitrate and sodium chromate. What would be the best method to separate this solid from the solution?

What is the electron arrangement for aluminum? 2,8,3 2,8,5 2,8,7 2,8,8 2,8,10

A cation forms when an atom gains an electron. a cation forms when an atom gains an electron. a. True b. False

How is enthalpy used to predict whether a reaction is endothermic or exothermic? A) When the enthalpy of the reactants is higher than the enthalpy of the products, the reaction is endothermic.

What elements form chemical bonds

Which of the following is not a pseudoscientific claim

Which action by the British government was considered by American colonists to be a violation of their rights as Englishmen?

Calculate moles of oxygen atoms in 0.68mol of KMnO4

C2H6 (g) + O2 (g) → CO2 (g) + H2O (g) (not balanced) Determine the number of liters of CO2 formed at STP when 240.0 grams of C2H6 is burned in excess oxygen gas?