The oxidation number of all metals on the periodic table have a positive (+) charge. Which of these best explain why?

Which is true of the low-tide zone? A. It hosts very few kinds of life. B. It is almost always under water. C. Its ecosystem never includes species that live on land. D. Creatures there can spend a lot of time exposed to the air.

This can best be explained due to A) density. B) friction. C) gravity. Eliminate D) inertia.

Which of these statements best explains why trees in a forest do not grow very close to one another? Their seeds blow away from them. Deer eat the newly sprouted seedlings. Trees are harvested by lumber companies.

If Siobhan hits a 0.25 kg volleyball with 0.5 N of force, what is the acceleration of the ball?

The sound produced by the loudspeaker in the drawing has a frequency of 11999 Hz and arrives at the microphone via two different paths. The sound travels through the left tube LXM, which has a fixed length.

Why is it important to change only one experimental variable at a time in an experiment?

A 0.0663 kg ingot of metal is heated to 241◦C and then is dropped into a beaker containing 0.395 kg of water initially at 25◦C. If the final equilibrium state of the mixed system is 27.4 ◦C, find the specific heat of the metal.

What does it mean when we say an atom has decayed?

If the mass of a material is 77 grams and the volume of the material is 19 cm3, what would the density of the material be

A bicyclist is in a 50-km race. She says she had an average velocity of 35. What is missing in the cyclist's velocity? A. units only B. units and distance C. direction only D. units and direction