Which of the following is NOT an example of a physical change?

a. the shaping of a gold bar

b. the explosion of fireworks

c. the melting of a Popsicle

d. the sanding of a piece of wood

What is the density of N20, a gas, at STP?

In three different experiments, the following results were obtained for the reaction A - > products: [A]o = 1.00M, t1/2=50 min; [A]o = 2.00M, t1/2 = 25 min; [A]o = 0.50M, t1/2 = 100 min.

Which of the following is associated with the use of genetic engineering to clone farm animals? A. Cloning could improve the availability of food in some areas B. The success rate for animal cloning is currently low. C.

Look at the reaction below. HBr + KOH KBr + H2O. Which substance is the base in the reaction? A. Hbr B. KOH C. KBr D. H2O

2 metercube of air kept in a vessal at 1 bar pressure is transferred into a 5 meter cube vessel find the pressure of the gas

Write its complete chemical symbol including mass number, atomic number, and net charge (if any).

How would you be able to use the spectrum of each gas to establish its identity

Which does not add to the reliability of a scientific source of information? displaying data in a colored chart clearly identifying the sources of the data explaining how the data was collected showing that many scientists had reviewed the

Given that pH + pOH = 14, what is the pH of a solution if its pOH is 12.4?

How long does it take to anser this quesiton fist one gets brialyest