How can you differentiate between elements and compounds

Penicillin is a drug that kills bacteria. Today, many bacteria are resistant to this drug. How does natural selection best explain this observation? A. Penicillin causes some bacteria to mutate. B. Some bacteria survive penicillin and reproduce. C.

suppose the spring in the sample problem is replaced with a spring that stretches 36 cm from its equilibrium position

What is the range of atomic numbers of elements that don't exist naturally on earth?

Suppose your hair grows at the rate 1/31 in. per day. find the rate at which it grows in nanometers per second. because the distance between atoms in a molecule is on the order of 0.

What is thr principle of screw gauge

It is difficult to lift a heavy stone than the lighter one on the earth, why?

The vapor pressure of ethanol at 25 degrees C is 7.83 kPa. Calculate the vapor pressure in atm. Round answer to 3 significant digits.

According to Newton's second law of motion acceleration or an object depends upon the ___ of the object and the ___ Acting on it. I'm confused on what the blanks are. I can't find them.

What is the concentration of H + ions at a pH = 7?

Suppose that Paul D. Trigger fires a bullet from a gun. Will the speed of the bullet leaving the muzzle will be the same as the speed of the recoiling gun? Explain.