Outbreak of diseases

Which describes the elements in any given period of the periodic table? A. They have common chemical properties, such as reactivity. B. They are in the same family. C. Their properties change according to a pattern as you go from left to right l. D.

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you

One disadvantage of this type of power is that it still pollutes the air

What type of substance is a catalyst? A. always a gas B. always a liquid C. always a powder D. A catalyst can be in many forms.

What is the instantaneous velocity v of the particle at t=10.0s?

A sample contains 10 g of a radioactive isotope. How much radioactive isotope will remain in the sample after 2 half-lives? A. 7.5 g B. 5.0 g C. 2.5 g D. 10.0 g

A plane flies along a straight line path after taking off, and it ends up 210 km farther east and 90.0 km farther north, relative to where it started. What is the plane's displacement?

Compare exothermic reactions and endothermic reactions. Give at least one similarity and one difference.

A solid cylinder with a radius of 73.3 cm and a mass of 2.33 kg accelerates uniformly from rest in 4.13 seconds while experiencing 6.71 rotations. Solve for the (a) final angular velocity.

In the early stages of its formation, earth became hot enough that some of its solid materials turned to liquid. Which of these factors did not directly contribute to earths high internal temperatures