As the temperature of a sample of gas falls from 37.8 ºC to 77.9 ºC, its pressure falls to 103.8 mm Hg. If the volume did not change, what was the original gas pressure?

Select one:

a. 91.9

b. 50.4

c. 120

d. 414

A person whose skin is coated with a toxic substance gives his/her contaminated clothing to another individual. This likely will result in what is called:A. RiskB. Cross-contaminationC. IngestionD. Reckless endangerment

Which of these measurements is expressed as three significant figures? A. 0.0070 cm B. 883.2 km C. 4.20 g D. 990, 000 mL

What happens to the energy needed to remove an electron as the atomic number increases across a period?

For the reaction 2Na + Cl2 → 2NaCl, how many grams of chlorine gas are required to react completely with 57.5 mol of sodium?

A certain element X is comprised of isotopes A, B, and C. Isotope A has a mass of 50 amu and is 70% of naturally occurring X. Isotope B is 35 amu and is 25% of X. Isotope C has a mass of 70 amu and is 5% of X. What is the atomic weight of element X?

Describe how jj thomson used the cathode ray tube to discover and evaluate the electron.

Type of ion formed by group 2A elements

When comparing the two elements P and I, the element with the higher first ionization energy is PP When comparing the two elements P and I, the element with the higher first ionization energy is blank based on periodic trends alone.

Internal respiration is the transfer of oxygen and carbon dioxide from the lungs to the tissue cells of the body. True or False

Which element is a metalloid? 1. Al 2. Ar 3. As 4. Aa