The universe contains billions of galaxies, each containing billions of stars.

True or false

What neutral atom has a atomic number of 15 and atomic mass of 31. 3 electrons are gained whats the result?

Which of the following BEST describes the process of evolution by natural selection? A. a rapid change of the traits of a species over time B. a gradual change of the traits of a species over time C.

What is a physical combination of substances? A. a compound B. a molecule C. a mixture D. an element

Which process is an example of an exothermic reaction?

How many moles are in 11.82 grams of gold?

How many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm and a temperature of 850 c?

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Which state of matter isn't typically found on earth?

Both black and white road surfaces absorb sunlight. the warmer road surface at the end of a sunny day is the

Which information in the periodic table indicates the number of protons in an atom? A. the position of the element in its column B. the element's chemical symbol C. the element's atomic mass D. the element's atomic number