What produces magnetic fields?

A) a built-up electric charge

B) moving electric charges

C) a wire wound around a bar magnet

D) two electrical insulators connected together

Which of the following factors determines the num. of limbs an animal has at birth A. Dietary factors B. environmental factors C. geographic features D. inherited factors

The energy changes for many unusual reactions can be determined using Hess's law. (a) Calculate ΔE for the conversion of F⁻ (g) into F⁺ (g). (b) Calculate ΔE for the conversion of Na⁺ (g) into Na⁻ (g).

A 70-liter tank of oxygen gas at 27 degree Celcius and 42.0 atm springs a leak overnight. when the tank was found in the morning, the pressure in the tank had dropped to 19.0 atm. If the tank originally held 119.

How many grams of sodium chloride can be produced from 46.3 g of sodium hydroxide?

Explain why Group 1 elements tend to form 1 + ions and Group 7 elements tend to form 1 - ions. a) the number of electrons of the ions will be even numbers b) the electron configuration of the ions will match that of a halogen c) the electron

Great white sharks live in the waters around California and feed on seals. Changes in his ecosystem have caused the seal population to decrease. Which result is an adaptation by sharks when there are fewer seals to eat? A.

Which of the following changes occurs with the greatest increase in entropy?

A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?

Which phrases describe all the outer planets' motion? Check all that apply. no rotation fast rotation slow revolution opposite revolution north to south rotation

Rank the species (amide ion, ammonia, or ammonium ion) from the largest to the smallest H-N-HH-N-H bond angle? Rank from largest to smallest H-N-HH-N-H bond angle. To rank items as equivalent, overlap them.