Resistance of a material being scratched in known as

What scientific instrument was used to dicover that not all atoms of neon have the same mass?

All fungi are. prokaryotes? eukaryotic? unicellular? multicellular

A 1.0L buffer solution contains 0.100 mol of HC2H3O2 and 0.100 mol of NaC2H3O2. The value of Ka for HC2H3O2 is 1.8Ă-10â'5. Part A Part complete Calculate the pH of the solution upon the addition of 0.015 mol of NaOH to the original buffer.

To identify a diatomic gas (X2), a researcher carried out the following experiment: She weighed an empty 2.2-L bulb, then filled it with the gas at 2.00 atm and 27.0 ∘C and weighed it again. The difference in mass was 5.1 g. Identify the gas.

The formation of gas resulting from the escape

A 27.40 g sample of liquid mercury is initially at 158.30°C. If the sample is heated at constant pressure ( = 1 atm), kJ of energy are needed to raise the temperature of the sample to 376.20°C. How much energy in kJ is required?

When a sample of gas is cooled, it condenses into a liquid. In which of the following ways do the molecules of the original gas sample compare with the molecules of the liquid? a. The molecules weigh less as a gas than they do as a liquid. b.

In a group 1 analysis, a student obtained a precipitate containing both AgCl and PbCh. Which of the following reagents would enable separation of AgCl (s) from PbCl (s) ? O Hys 0 Na2CO3 o KOH O NH3 O

Round to four significant figures 0.00238866

Gases are unique because it is the only phase that can be compressed can flow is composed of moving particles cannot be compressed