An iron bar at 325 K is placed in a sample of water. The iron bar gains energy from the water if the temperature of the water is

(1) 65 K (3) 65°C

(2) 45 K (4) 45°C

What is chemical energy? a) the form of energy that we perceive with our eyes b) the energy of motion c) the energy that does work through chemical reactions

The potential difference between two parallel plates 175 V. An α particle with mass of 6.5 * 10-27 kg and charge of 3.2 * 10-19 C is released from rest near the positive plate.

For clouds to form, water vapor in the air must condense and change from a gas to a liquid. What must water molecules do as part of this process? A. come close together and stick to each other B. escape into the surrounding air C.

1-bromodecane (C10H21Br) produces a mass spectrum with a parent molecular ion (M) peak at m/z 220 (100%). A peak at m/z 222 (98%) also appears in the spectrum. What causes this signal in the mass spectrum

A 4.00 m solution of KCl was prepared using 1.00 kg of water at 25.0 ∘C. Once the solid had all dissolved, the temperature of the solution was 12.3 ∘C. Calculate the heat of solution, ΔHsoln, of KCl.

Glucose is a simple sugar made up of a carbon, hydrogen, and oxygen. What kind of molecule is glucose?

Imagine that you have a 7.00 LL gas tank and a 3.50 LL gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.

Which profession is likely to use a radiation shield

What is the solution to the problem expressed to the correct number of significant figures? 2.13 + 1 = ?

What are the names of groups of metalloids