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Questions in chemistry

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

[Done] True or False? Oxidizers can burn more intensely than either flammable or combustible substances.

[Done] $MgCl _2(aq)$ and $Na _3 PO _4(aq)$ $Mg Cl _2( aq ) + Na _3 PO _4( aq ) \rightarrow$ Molecular Equation Complete Ionic Equation Net Ionic Equation Spectator Ions

[Done] Select all that apply. Which of the following are included in the study of chemistry? A. The effect of Earth's gravitational field on matter B. The definition of mass C. The changes matter undergoes D. The study of matter

[Done] Suppose 15.3 g of potassium chloride is dissolved in 250 mL of a 0.30 M aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the potassium chloride is dissolved in it. Round your answer to 3 significant digits.

[Done] Which of the following usually have lower melting points than ionic solids? A. Atomic solids B. Metallic solids C. Molecular solids D. Network solids

[Done] What would happen if N2 were added to N2(g) + O2(g) ⇌ 2NO (g) at equilibrium?

[Done] Jason combines the two intermediate steps shown. $\begin{array}{l} N_2(g)+O_2(g) \longrightarrow 2 NO(g) \\ 2 NO(g)+O_2(g) \longrightarrow 2 NO_2(g) \end{array}$ Which best describes what Jason should do with the oxygen molecules? A. Place two of them as products. B. Place two of them as reactants. C. Cancel them out because there is one in each equation. D. Double them because there is one in each equation.

[Done] Perform the following mathematical operation and report the answer to the correct number of significant figures. [tex]$3.22 \times 0.17=[?]$[/tex]

[Done] Calculate the mass percentage of 15 ppm of chloroform (CHCl3) in water. (1) 15×10⁻⁴ (2) 15×10⁻³ (3) 15×10⁻⁶ (4) 15×10⁻²