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Questions in chemistry

[Terjawab] 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. $252 J /\left( g \cdot{ }^{\circ} C \right)$

[Terjawab] 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]

[Terjawab] 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.

[Terjawab] 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]

[Terjawab] A chemist is trying to identify a sample of metal that is listed in this table. She passes an electrical current through the metals listed in the table; it's one of the best conductors. Then she heats the metal to [tex]$1000^{\circ} C$[/tex]. The metal doesn't melt. Which type of metal does the chemist have? | Material | Melting Point ([tex]${}^{\circ} C$[/tex]) | Electrical Conductivity Ranking | | :------- | :----------------------------- | :----------------------------- | | aluminum | 660 | 3 | | copper | 1085 | 2 | | zinc | 420 | 4 | | silver | 962 | 1 | | nickel | 1455 | 5 | A. aluminum B. copper C. Zinc D. silver E. nickel

[Terjawab] What happens during chemical reactions? A. The total amount of energy changes. B. Atoms are changed into new elements. C. Total mass increases in the products. D. Energy is given off or absorbed.

[Terjawab] What is the correct formula that would result from the combination of the two ionic species? [tex]$Mg^{2+} \text { and } PO_4{ }^{3-}$[/tex] A. [tex]$Mg _3\left( PO _4\right)_2$[/tex] B. [tex]$Mg _2\left( PO _4\right)_3$[/tex] C. [tex]$Mg \left( PO _4\right)_3$[/tex] D. [tex]$MgPO _4$[/tex]

[Terjawab] Which of the following items are examples of Class 3 Flammable Liquids? Select the three (3) correct options. Nail Polish Helium Hairspray Bleach Gasoline

[Terjawab] Summarize what you have studied. If a substance is ionic, then it likely will...

[Terjawab] Use the periodic table to write the electron configuration of selenium (Se). Place the sublevels in order of filling from least energy to most energy.