A machine has an efficiency of 70%. How much woke does the machine do when 20,000 J of work is done on it?

Which number most likely represents the first ionization energy, in kilocalories per mole of atoms, for a nonmetallic element? 1.96 2.138 3.194 4.239

Which of the following is not a potential sign of chemical change? a. release of gas c. change of color b. evaporation of water d. production of gas

What is the molarity of a solution that contains 14 moles of solute and 2 liters of solution?

How many atoms are in 5.40mol of iron

Which statement best describes elements? A. They are the smallest particles of any material. B. They are composed of only one type of atom. C. They are the most expensive materials on earth. D. They break down easily

Which of the following organisms are carnivores? Producers Omnivores Consumers Decomposers

What is the number of moles in 2.33 L of H2S gas at STP?

Nitrous oxide (n2o), or laughing gas, is commonly used as an anesthetic in dentistry and surgery. how many moles are present in 8.4 liters of nitrous oxide at stp?

How can an atom be electrically neutral when it contains particles that are charged?

Is boiling water considered physical or chemical bond