Which of these is an indication that a chemical reaction has occurred?

A. Melting of a substance

B. A change of color in a substance

C. Boiling of a substance

D. Freezing of a substance

What is the force caused by wind pushing on a building?

Read the list of elements given below. Be, Mg, Ca, Sr Which of the following about the elements is true? All of them are unreactive metalloids. All of them are hard and dense metals.

Were would you be if all the stars you see are circumpolar ps its not on top of the highest mountain lol

Which device involves the use of plasma in technology

A 1.000 mL sample of acetone, a common solvent sometimes used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g. The following values were obtained when the acetone-filled bottle was weighed: 38.7798 g, 38.

Reaction rates are affected by how often the particles collide true false

A 25 N and 5 N force pull to the right. Friction is 10 N. If the object is 5 kg, find the net force and acceleration.

What properties of matter are intensive independent of their size

What is the density of an object having a mass of 8.0g and a volume of 25cm3

What is a Cilla? (In drawing)