How are elements and atoms related?

Lewis structure for propane

The molar entropy of helium gas at 258C and 1.00 atm is 126.1 J K21 mol21. Assuming ideal behavior, calculate the entropy of the following. a. 0.100 mole of He (g) at 258C and a volume of 5.00 L b. 3.00 moles of He (g) at 258C and a volume of 3000.

Which of the following statments is true for gas particles? they move freely and combine with each other. they dont move at all they move slowly and in a structured pattern they are constantly in motion and changing position.

What is an arpeggio? A. a blend of several tones, which reverberate simultaneously B. playing a series of chords in a particular order C. unsteady combination of chords producing rough sound D. musical notes set to sound in a discontinuous manner

Which of these is an example of a chemical change? A fireworks exploding B grinding powder C melting cheese D ironing a shirt

On a separate sheet of paper, write the formulas for each of the following, complete and balance 1. iron + copper (II) sulfate 2. potassium chloride + mercury (I) sulfate 3. sulfur + oxygen

Match the substance with its chemical formula. 1. H + hydroxide ion 2. H3O + hydronium ion 3. OH - hydrogen ion

Which of those molecules are polar. Co2, So2, CH2Cl2, PCl3

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)