What is the second most abundant element in stars?

A.

iron

B.

helium

C.

oxygen

D.

hydrogen

Scientific theories are explanations for naturally occurring events or phenomena. Although scientific theories require extensive observations and experimentation, they can change over time as new evidence is discovered.

The combining of two atomic nuclei to produce one larger nucleus is called a. hydrogen power. b. nuclear fission. c. nuclear fusion. d. a meltdown.

Give chemical test to distinguish between ethanol and methanol.

What are some ways we explore space unmanned?

Which of the following statements best defines Le Châtelier's principle? A. It can be used to predict the effect of applying conditions of equilibrium on a chemical system. B.

Who is one of the first scientists to propose that species change over time

A balloon has a volume of 10,500 liters and the tempature is 15 C. If the temp tire were - 25C what would the volume of the balloon be? A-12,194L B - 9,042L

What types of star can explode in a supernova

Which graph best shows the relationship between kelvin temperature and average kinetic energy?

Can matter exist at a temperature below absolute zero? Why or why not?