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Questions in chemistry
📝 Answered - The molecular mass of sodium oxide $(Na_2O)$ is A) 45.97954. B) 61.97894. C) 22.98977. D) 38.98917.
📝 Answered - What happened when you mixed certain materials like baking soda and lemon?
📝 Answered - Using the steps above, a solution of sodium carbonate reacts with a solution of sulphuric acid to produce sodium sulphate, carbon dioxide, and water. a. Write the ionic equation for this reaction. b. Identify the spectator ions in this reaction. Balance the equation below and write its ionic equation. [tex]CaCO_3(s)+HCl(aq) \longrightarrow CaCl_2(aq)+CO_2(g)+H_2 O(l)[/tex]
📝 Answered - Consider the following intermediate chemical equations: [tex] \begin{array}{l} C(s)+\frac{1}{2} O_2(g) \rightarrow CO(g) \\ CO(g)+\frac{1}{2} O_2(g) \rightarrow CO_2(g) \end{array} [/tex] How will oxygen appear in the final chemical equation? A. [tex]O _2(g)[/tex] as a product B. [tex]O _2(g)[/tex] as a reactant C. [tex]O ( g )[/tex] as a product D. [tex]2 O ( g )[/tex] as a reactant
📝 Answered - Which of these is a chemical property of a substance? A. texture B. ductility C. reactivity D. conductivity
📝 Answered - Use atomic diagrams to show how a covalent bond is formed between 3 hydrogen atoms and 1 nitrogen atom to form NH3.
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - How many moles of water are needed?
📝 Answered - True or False? Iridium-192 and cobalt-60 are radioactive materials that are used in industrial processes.
📝 Answered - Which is an intensive property of a substance? A. density B. volume C. length D. mass
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