Given the reaction that occurs in an electrochemical cell: zn (s) + cuso4 (aq) znso4 (aq) + cu (s) during this reaction, the oxidation number of zn changes from

On the ph scale, which value represents a base? 3 7 10

Which satement test testes tre availability of romenewable energy resources Ter supplies will be completely used up within ten years They are sadily available in all countries er exact amounts are not currently known They are stored in primary

Which of the following 0.5 M aqueous salt solutions will have a pH of 7.0 at LiF RbBr NaClO4 NH4Cl A) LiF only B) NaClO4 only C) LiF and RbBr D) RbBr and NaClO4

How many moles are in 38grams of H2O

What is the major current use of solar thermal energy? A. to grow crops for biomass B. to provide heat and hot water for houses C. to collect heat from Earth's igneous rocks D. to power wind farms

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation:

How does an electromagnet create a magnetic field

Magnetism, reactivity, and fluorescence are three special properties used to identify minerals. true or false

Which of these molecules is least likely to form a hydrogen bond with a water molecule