The efficiency of a machine is always less than 100% because

Which of the following transitions would release energy? n=2->n=3 n=1 - > n=3 n=3 - >n=1 n=3->n=2

Two jars are placed on a counter with a McDonald's French Fry inside, one has a lid, the other does not. They are left alone to see which one decays faster, after 2 days the fry in the closed jar looks fresher.

Which of the following is considered a molecular compound A:NaOH B:K2O C:KCL D:H2O

An atom has 5 protons and 7 neutrons

In the flask diagrammed below, the left bulb contains 3.0L of neon at a pressure of 2.0 atm. The right bulb contains 2.0L of argon at a pressure of 1.0 atm.

What is a scientific explanation for a range of hypotheses and observations supported by testing

A chemical reaction involves the rearrangement of atoms to form new molecules. During a chemical reaction, however, atoms are neither created nor destroyed. Which of the following is true about the atoms involved in a chemical reaction? A.

What is the new concentration, after diluting 300 mL of a 1.5 M LiCl solution to 1L

The answer that he gave was wrong

In which orbital does an electron in a bromine atom experience the smallest?