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Questions in chemistry

📝 Answered - What is the correct electron configuration of phosphorus $(P)$? A. $1 s^2 2 s^2 2 p^6 3 s^2 3 p^3$ B. $1 s^2 2 s^2 2 p^3 3 s^2 3 p^3$ C. $1 s^2 2 s^2 2 p^6 2 d^5$ D. $1 s^2 2 s^2 2 p^6 3 s^1 3 p^4$

📝 Answered - The chemical equation for the formation of ammonia is unbalanced. [tex]3 H_2(g)+N_2(g) \rightarrow NH_3(g)[/tex] If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed? A. 1 B. 2 C. 3 D. 4

📝 Answered - According to the Arrhenius definitions of acids and bases, choose the acids from the list of acids and bases. Check all that apply. HBr [tex]$Sr ( OH )_2$[/tex] HClO [tex]$H _2 S$[/tex] LiOH

📝 Answered - A laboratory technician combined sodium hydroxide with excess iron(II) nitrate. A reaction took place according to this chemical equation: $2 NaOH + Fe ( NO _3)_2 \rightarrow NaNO _3+ Fe ( OH )_2$. The reaction produced 3.70 grams of iron(II) hydroxide. Assuming the reaction came to completion, what was the initial mass of sodium hydroxide? A. 1.6 g B. 2.0 g C. 3.3 g

📝 Answered - Which balances the equation [tex]Mg + O _2 \rightarrow MgO[/tex]? A. [tex]Mg +2 O _2 \rightarrow 4 MgO[/tex] B. [tex]2 Mg +2 O _2 \rightarrow 2 MgO[/tex] C. [tex]2 Mg + O _2 \rightarrow 2 MgO[/tex] D. [tex]2 Mg +2 O _2 \rightarrow 4 MgO[/tex]

📝 Answered - "K" is the chemical symbol for which of the following substances? A. Iron B. Barium C. Calcium D. Potassium

📝 Answered - When carbon dioxide dissolves in water, it sometimes reacts with water to form carbonic acid as in this balanced equation: [tex]CO_2+H_2 O \rightarrow H_2 CO_3[/tex]. If 495 milliliters of carbon dioxide at [tex]25^{\circ} C[/tex] and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid? Use the periodic table and the ideal gas resource. A. 0.889 g B. 1.10 g C. 1.27 g D. 2.02 g

📝 Answered - In an element's square on the periodic table, the number with the greatest numerical value represents the A. number of neutrons. B. number of electrons. C. atomic number. D. atomic mass.

📝 Answered - 1. Name any two ores of iron. 2. Write any two ores of copper. 3. Name the chief ores of aluminium.

📝 Answered - Are PFOS a single chemical or multiple forms of "forever chemicals"? A. Multiple forms B. A single form