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Questions in chemistry

[Homework Help] The molecular mass of sodium oxide $(Na_2O)$ is A) 45.97954. B) 61.97894. C) 22.98977. D) 38.98917.

[Homework Help] What happened when you mixed certain materials like baking soda and lemon?

[Homework Help] 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]

[Homework Help] 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

[Homework Help] Which of these is a chemical property of a substance? A. texture B. ductility C. reactivity D. conductivity

[Homework Help] Use atomic diagrams to show how a covalent bond is formed between 3 hydrogen atoms and 1 nitrogen atom to form NH3.

[Homework Help] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Homework Help] How many moles of water are needed?

[Homework Help] True or False? Iridium-192 and cobalt-60 are radioactive materials that are used in industrial processes.

[Homework Help] Which is an intensive property of a substance? A. density B. volume C. length D. mass