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Q: How many valence electrons does strontium (Sr) have? (1 points) A) 1 B) 2 C) 5 D) 6
A: b)2
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Asked 6/13/2011 8:42:07 AM
Updated 9/20/2011 12:01:23 PM
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b)2
Added 9/20/2011 12:01:24 PM
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Why are scientific journals considered more reliable sources than web pages for information about science? (2 points) A) Web pages are too difficult to make. B) Scientists never lie about their data. C) Scientific journals are read and openly criticized by many scientists. D) Web pages are subject to strict standards of evidence and sources.
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Updated 6/10/2011 8:17:00 AM
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C) Scientific journals are read and openly criticized by many scientists.
Added 6/10/2011 8:15:27 AM
it's called peer review. very important!
Added 6/10/2011 8:17:00 AM
Which is evidence that the reaction below is a redox reaction? 2Na + Cl2 -> 2NaCl (2 points) A) The sodium atom is a pure element as a reactant and becomes part of a compound. B) Two different elements take part in the reaction. C) Oxidation occurs to both elements in the reaction. D) There are no ions in the equation.
Weegy: B) Two different elements take part in the reaction. (More)
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Expert Answered
Updated 6/14/2011 3:07:40 PM
2 Answers/Comments
Na loses an e-. oxidation, Cl takes an e-, reduction, ions are formed,no really good answer, a is the best
Added 6/14/2011 3:07:04 PM
Na loses an e-. oxidation, Cl takes an e-, reduction, ions are formed,no really good answer, a is the best
Added 6/14/2011 3:07:40 PM
In an experiment, a student needs to know the mass of four different objects: a shoe, piece of paper, book, and a tissue. Which of the following units of measurement should the student use? (2 points) A) milligram B) ounce C) gram D) kilogram
Weegy: D) kilogram [smile] (More)
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Expert Answered
Updated 6/10/2011 8:44:55 AM
1 Answer/Comment
A) milligram is correct. A kilogram would best be used for mass of much heavier objects.
Added 6/10/2011 8:44:55 AM
This answer has been added to the Weegy Knowledgebase
Which describes how chemical changes are different from physical changes? (2 points) A) Chemical changes can be measured, but physical changes cannot. B) Chemical changes involve the formation of a new substance. C) Chemical changes release energy, but physical changes absorb energy. D) Chemical changes cannot be caused by oxygen.
Weegy: A) Chemical changes can be measured, but physical changes cannot. (More)
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Updated 6/13/2011 7:40:10 PM
1 Answer/Comment
The correct answer should have been B) Chemical changes involve the formation of a new substance.
Added 6/13/2011 7:40:10 PM
Which phase change is the result of particles moving more quickly? (2 points) A) liquid to gas B) liquid to solid C) gas to liquid D) gas to solid
Weegy: A) liquid to gas (More)
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Updated 6/10/2011 9:40:21 AM
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