Topic
Q:
Question
30. g of an unknown substance at \( 120.0^{\circ} \mathrm{C} \) is placed in 600.0 g of water at
\( 30.0^{\circ} \mathrm{C} \). The final temperature of the water is \( 31.4^{\circ} \mathrm{C} \). What was the specific heat
of the metal?
- Round your answer to one decimal place
- Use \( 4.184 \frac{\mathrm{~J}}{\mathrm{~g} \mathrm{C}} \) for the specific heat of water.
Provide your answer below:
line
Q:
Which of the following salts is water soluble?
\( \begin{array}{l}\text { KClO3 } \\ \text { O BaSO4 } \\ \text { O } \\ \mathrm{Ag3PO} 4 \\ \mathrm{FeCO} 3\end{array} \)
Q:
Which one of the following is a strong acid?
HF
HNO 2
HBrO
HCN
HI
Q:
Which one of the following is NOT a soluble base?
\( \begin{array}{l}\mathrm{O} \mathrm{CsOH} \\ \mathrm{KOH} \\ O \mathrm{Fe}(\mathrm{OH}) 2 \\ \mathrm{Ca}(\mathrm{OH}) 2 \\ \mathrm{Oa}(\mathrm{OH}) 2\end{array} \)
Q:
Witherite is a mineral that contains barium carbonate and nonreactive material. If a 1.68
gram sample of witherite were to react completely with 24.6 mL of 0.2558 M HCl , what is the
percent of barium carbonate in the sample? The balanced reaction is shown below.
\( 1 \mathrm{BaCO}_{3}+2 \mathrm{HCl} \gg \mathrm{BaCl}_{2}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \)
Use the variation: \( \%= \) (mass pure \( \left.\mathrm{BaCO}_{3}\right) / \) (mass witherite) \( \times 100 \)
Q:
4) For one Chemistry test. Nancy had to answer 25 questions, Or these questions, Nancy
answered \( 80 \% \) of them correctly. How many questions did Nancy correctly answer on her
test? Round your answer to the nearest whole number if necessary.
Q:
Silver nitrate \& calcium chloride react to produce a thick white precipitate of silver chloride,
according to the reaction below. How many grams of silver chloride should be expected if 195
mL of 6.00 M silver nitrate and 225 mL of 3.00 M calcium chloride react?
\( 2 \mathrm{AgNO}_{3}+1 \mathrm{CaCl}_{2} \rightarrow 2 \mathrm{AgCl}+1 \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2} \)
Q:
Ethanol burns in air according to the reaction below. When 250.0 grams of ethanol \( \left(\mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}\right) \)
reacts with 50.0 L of oxygen at STP, calculate the volume of water vapor at STP.
\( 2 \mathrm{C}_{2} \mathrm{H}_{6} \mathrm{O}+6 \mathrm{O}_{2} \rightarrow 4 \mathrm{CO}_{2}+6 \mathrm{H}_{2} \mathrm{O} \)
Q:
9. ¿Cuál es la molaridad de una solución que se prepara diluyendo a
\( \mathbf{2 ~ L , ~} 12.7 \mathrm{~mL} \) de ácido sulfúrico de densidad 1.67 y \( 75 \% \) de pureza en
peso
0.1623 M
0.0811 M
0.795 M
0.1413 M
Q:
9. ¿Cuál es la molaridad de una solución que se prepara diluyendo a
\( 2 \mathrm{~L}, 12.7 \mathrm{~mL} \) de ácido sulfúrico de densidad 1.67 y \( 75 \% \) de pureza en
peso
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