Select the correct answer. which fact represents evidence for the big bang theory? a. every object located in the universe emits radiation. b. the mass that makes up the universe consists of 25% helium. c. the sun around which earth revolves is not the biggest star in the universe. d. human eyes cannot perceive all forms of electromagnetic radiation.

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided

Examine these two msds from different manufacturers for sodium hydroxide (naoh). compare and contrast the following aspects: chemical names, chemical properties, order of components, health hazards, and proper disposal. click on each of the links to examine two msds reports from different sources. sodium hydroxide version 1 sodium hydroxide version 2