Chemistry

Which of the following types of flasks are considered to be the most suitable for vacuum operations? A Round-bottomed B Thick-walled C ) Both of the above D None of the above

Which of the following is NOT a property of water? A. low specific heat B. Good solvent C. forms hydrogen bonds (H-bonds)

Which process can break covalent bonds? cohesion hydrolysis condensation dehydration synthesis

Where do you find your protons? __ How do you calculate neutrons? __ Are electrons the same as protons or neutrons? __

How are chemicals most likely to get into food? When they are used incorrectly When they are stored in original containers When they are purchased from unsafe sources When they are kept past their expiration date

Water has a positive charged oxygen True False

1. Calculate the mass in milligrams of the aspirin in a tablet that contains 3.0 Kilograms of aspirin.

Which TWO ways help a student determine if two atoms are the same element? A. by identifying the number of protons in each atom B. by identifying the number of neutrons in each atom C. by identifying the number of electrons in each atom D. by identifying the number of positive charges in each atom

C. In each case tell whether the trait or charncteristic being described is intensive or extensive. 1. The block of aluminum weighs 2.34 tons. __ 2. The boiling point of cyclohexane is'about 80 degrees C. __ 3. Gasoline floats on water which indicates its density is less than that of water. __ 4. The temperature of this water sample is 273.3 Kelvin. __ 5. Aluminum has a density of 2.702gcm^-3 __

Question 3 (1 point) Isotopic abundances are different in other parts of the universe. Suppose that on planet Krypton we find the following stable isotopes and abundances for boron: {}^10B(10.013amu) 65.75% {}^11B(11.009amu) 25.55% {}^12B(12.014amu) 8.70% What is the value of the average atomic mass of boron on planet Krypton in amu? Answer with 3 decimal places. Do not include the unit in your answer. Your Answer: square