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Questions in chemistry
📝 Answered - Why is it incorrect to balance a chemical equation by changing the subscripts?
📝 Answered - When ethanol is burned, it's converted into carbon dioxide and water. Does the ethanol undergo a physical change or a chemical change? Explain.
📝 Answered - What are 3 pros and cons of nuclear transmutation?
📝 Answered - What is the common English unit of mass?
📝 Answered - What is the common English unit of length?
📝 Answered - All noble gas elements, except helium, have 8 electrons in their outermost energy level. True or False?
📝 Answered - When a sun-like star's hydrogen runs out, at first it expands into: A. a supergiant B. a white dwarf C. a star similar to our sun D. a red giant
📝 Answered - What is a tough, rigid, outer covering that protects some cells and gives them shape?
📝 Answered - Powdered sulfur is yellow, and powdered iron is gray. When powdered sulfur and powdered iron are mixed at 20°C, the powdered iron A. becomes yellow B. remains ionic C. becomes a liquid D. remains magnetic
📝 Answered - How do you balance the equation [tex]$NO_2 + H_2 \rightarrow NH_3 + H_2O$[/tex] using the oxidation number method?
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