If a system requires 150 J of input work and produces 123 J of output work, what's its efficiency? A. 72% B. 122% C. 82% D. 92%

Lewis dot diagram of strontium?

At ph 1.8, dichloroacetic acid is 8% dissociated. what is the pka for dichloroacetic acid?

How many atoms of Phosphorus (symbol P) are in 45.67g of P? (Your answer should just be a number. Do not include atoms as the unit. For scientific notation use the "^" symbol before the exponent. For example 2.54 x 10^5)

What percentage of Earth's water can be found in soil

Determine the pH of a 0.0019 M HNO₃ solution.

Which best describes thermal energy? It is the difference between internal energies of two or more substances It is the sum of internal energies of two or more substances O It is the portion of internal energy that can be transferred from one

According to Neil's Bohr's atomic model, what occurs when an atom absorbs radiated energy? A) an electron shifts from a lower energy to a higher one B) an electron shifts from a higher energy lever to a lower one C) an electron spirals towards the

Which is true about dissolving a polar substance in water? A) the solvent particles are all nonpolar molecules B) the solute particles are carried into the solution C) the solute particles have no attraction for the solvent molecules D) the solute

Which societal problem can be solved, in part, by scientists identifying areas of high biodiversity? A. reducing the amount of pollution B. finding affordable housing C. protecting the environment D. providing access to clean water

Brianna wanted to compare the densities of two different solids of the same size 6cm3 (same volume) to see which one was more dense. Solid A had a mass of 2 grams and Solid B had a mass of 0.5 grams.