What fraction of a sample of gold-198 remains radioactive after 2.69 days.

A 1.2 kg block of iron at 32 ∘C is rapidly heated by a torch such that 12 kJ is transferred to it. What temperature would the block of iron reach (assuming the complete transfer of heat and no loss to the surroundings) ?

A board has a mass of 750 g. If you ground the whole board down to sawdust, what would be the mass of the pile of sawdust?

A buffered solution containing dissolved aniline, C 6 H 5 NH 2, and aniline hydrochloride, C 6 H 5 NH 3 Cl, has a pH of 5.47. A. Determine the concentration of C 6 H 5 NH + 3 in the solution if the concentration of C 6 H 5 NH 2 is 0.215 M.

Mrs. Smith is demonstrating a chemical change for her class. She places 15 grams of baking soda into a beaker. Next she adds 15 grams of vinegar to the same beaker. When the two compounds make contact, they bubble and fizz a great deal.

Which would slow down a reaction that is occurring in a solution at 25 degrees Celcius? Question 11 options: increase the air pressure above the solution add a catalyst put the solution over ice add 10mL of water at 30 degree Celcius

What do we call the process by which cells obtain the energy that they need?

Which of the following statements describes how the periodic table is organized? 1. The elements are organized alphabetically. 2. The elements are organized by their size. 3. The elements are organized by the date they were discovered. 4.

Which of the following is a mixture A aluminum B BaSO3 C Milk D table salt

Which of the following quantum number combinations is not allowed in an atom? A. n = 2, l = 1, mr = - 1 B. n = 1, l = 1, m = 0 C. n = 8, l = 5, m = - 4 D. n = 6, l = 3, m = 2

13. Adding thermal energy to a gas at constant pressure will cause