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Questions in chemistry

[Terjawab] The solubility of solid $A$ at $60^{\circ} C$ is $24 g / 100 g$ water. (a) What is the amount of solid required to saturate 30 g of water at $60^{\circ} C$? (b) What will be the amount of saturated solution obtained at $60^{\circ} C$ when 12 the solid $A$ is used to prepare a saturated solution?

[Terjawab] Potassium and sulfur react to form an ionic compound. What is the correct formula of the compound formed? A. [tex]K _2 S[/tex] B. PS C. [tex]P _2 S_3[/tex] D. [tex]2 K^{+} S ^{2-}[/tex]

[Terjawab] What mass of NaCl formed when 0.25 g Na react completely with $0.39 g Cl _2$? A. -0.14 g NaCl B. 0.64 g NaCl C. 0.14 g NaCl D. 0.59 g NaCl

[Terjawab] In which section of a safety data sheet would you find information about the safe handling and storage of a hazardous chemical substance? a) Section 3 b) Section 7 c) Section 14 d) Section 9

[Terjawab] Yeast solution, hydrogen peroxide, and dish soap were mixed in different quantities in four cups. The height of the foam produced was measured at 2, 4, and 6 minutes. The results are shown in the table below. | Cup | Yeast solution | Hydrogen Peroxide | Dish Soap | Height of foam produced at 2 minutes (cm) | Height of foam produced at 4 minutes (cm) | Height foam produce at 6 minutes (cm) | |---|---|---|---|---|---|---| | A | 1 tbsp | None | 1 tsp | | | | | B | 1 tbsp | 1 tbsp | 1 tsp | | | | | C | 1 tbsp | 2 tbsp | 1 tsp | | | | | D | 1 tbsp | 3 tbsp | 1 tsp | | | |

[Terjawab] Which type of reaction has the general formula of [tex]$AB + CD \rightarrow AD + CB$[/tex]? A. synthesis B. decomposition C. oxidation D. replacement

[Terjawab] The standard reaction free energy [tex]$\Delta G^0=29 . kJ$[/tex] for this reaction: [tex]$Fe_2 O_3(g)+2 H_2(g) \rightarrow 2 Fe(s)+3 H_2 O(l)$[/tex] Use this information to complete the table below. Round each of your answers to the nearest kJ. | reaction | [tex]$\Delta G^0$[/tex] | |---|---| | [tex]$2 Fe _2 O _3(g)+4 H _2(g) \rightarrow 4 Fe ( s )+6 H _2 O ( l )$[/tex] | -12 kJ | | [tex]$\frac{2}{3} Fe ( s )+ H _2 O ( l ) \rightarrow \frac{1}{3} Fe _2 O _3(g)+\frac{2}{3} H _2(g)$[/tex] | 12 kJ | | [tex]$2 Fe ( s )+3 H _2 O ( l ) \rightarrow Fe _2 O _3(g)+2 H _2(g)$[/tex] | 29 kJ |

[Terjawab] What is the correct formula for the ionic compound that would result from the combination of sodium and phosphorus? A. $Na _3 P$ B. $Na _3 Ph$ C. $NaP _3$ D. $S _3 P$

[Terjawab] Match column I with column II and select the correct option using the given codes. | Column I | Column II | | :---------------------------------------------- | :------------------------------------------------------------ | | a. A metal that forms amphoteric oxides | (i) Ga | | b. A metal which melts when kept on our palm | (ii) / M | | C. A metal that reacts with nitric acid | (iii) AI | | d. A metal which cannot displace hydrogen from acids | (iv) Mn | A. $a =$ (ii), $b =$ (i), $c =$ (iii), $d =$ (iv) B. $a =$ (iii), $b =$ (i), $c =$ (iv), $d =$ (ii) C. $a=$ (iv), $b=$ (ii), $c=$ (iii), $d=$ (i) D. $a =$ (iii), $b =$ (ii), $c =$ (j), $d =$ (iv)

[Terjawab] In this reaction, 28.5 g of silver nitrate reacts with 16.7 g of barium sulfate. What will be the mass of the products? [tex]AgNO_3+BaSO_4 \rightarrow \text { Products }[/tex]