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Questions in chemistry

📝 Answered - Test your understanding of isotopes by selecting the correct relationship between the pair of atoms ${ }_6^{13} C$ A. Same Atom, Not Isotopes of Each Other B. Different Element C. Isotopes

📝 Answered - A 1.8 gram sample of HCl is added to enough water to make 5.5 L of solution. What is the pH of this solution at 25 °C? Be sure to use at least 4 significant figures throughout your calculations; you can only be off by 0.1 pH units. Note: Due to the constraints of Canvas, please assume that all numerical values were given with 4 significant figures.

📝 Answered - Consider the nuclear equation below. ${ }_{94}^{239} Pu \longrightarrow X+{ }_2^4 He$ What is $X$ ? A. ${ }_{96}^{235} Cm$ B. ${ }_{92}^{243} U$ C. ${ }_{92}^{235} U$ D. ${ }_{96}^{243} Cm$

📝 Answered - Which of the following shows a Bronsted-Lowry acid reacting? A. [tex]$CO + NO _2 \rightarrow CO _2+ NO$[/tex] B. [tex]$NH _3+ H ^{+} \rightarrow NH _4{ }^{+}$[/tex] C. [tex]$CO _3^{2-}+ H ^{+} \rightarrow HCO _3^{-}$[/tex] D. [tex]$HCl + H _2 O \rightarrow H _3 O ^{+}+ Cl ^{-}$[/tex]

📝 Answered - The table describes how some substances were formed. | Substance | Description | |---|---| | $P$ | Formed by boiling pure water | | $Q$ | Formed by combining three hydrogen atoms to every nitrogen atom | | $R$ | Formed by adding 5 g of sugar to 1 L of water | | $S$ | Formed by compressing carbon under high pressure | Based on the given descriptions, which substance is most likely a mixture? P Q R S

📝 Answered - When being stored, flammable gases should be separated from each other and from: A. toxic chemicals B. corrosives C. oxidizers D. cryogenic liquids

📝 Answered - What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from $10.0^{\circ} C$ to $70.0^{\circ} C$ when $2,520 J$ of heat is applied? Use $q=m C _p \Delta T$. A. $0.00420 J /\left( g \cdot{ }^{\circ} C \right)$ B. $0.00661 J /\left( g \cdot{ }^{\circ} C \right)$ C. $238 J /\left( g \cdot{ }^{\circ} C \right)$ D. $252 J /\left( g \cdot{ }^{\circ} C \right)$

📝 Answered - Which of the following shows a Bronsted-Lowry acid reacting? A. [tex]$CO + NO _2 \rightarrow CO _2+ NO$[/tex] B. [tex]$NH _3+ H ^{+} \rightarrow NH _4{ }^{+}$[/tex] C. [tex]$CO _3^{2-}+ H ^{+} \rightarrow HCO _3^{-}$[/tex] D. [tex]$HCl + H _2 O \rightarrow H _3 O ^{+}+ Cl ^{-}$[/tex]

📝 Answered - Which statement would be the most useful for deriving the ideal gas law? A. Volume is directly proportional to the number of moles. B. Volume is inversely proportional to the temperature. C. Pressure is directly proportional to the volume. D. Pressure is inversely proportional to the number of moles.

📝 Answered - A scientist wants to determine how many moles of gold (III) sulfite [tex]$\left( Au _2\left( SO _3\right)_3\right)$[/tex] would be needed to react completely with 6.65 mol of sodium nitrate ([tex]$NaNO _3$[/tex]). [tex]$6 NaNO_3+Au_2\left(SO_3\right)_3 \rightarrow 3 Na_2 SO_3+2 Au\left(NO_3\right)_3$[/tex] How many moles of gold (III) sulfite would be needed? [tex]$6.65 mol NaNO _3$[/tex]