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Questions in chemistry

[Terjawab] What quantity can tell you whether a solution is acidic or basic? A. temperature B. volume C. HI D. pH E. mass

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] What is the molar mass of aspirin, [tex]$C _9 H _8 O _4$[/tex]?

[Terjawab] Which equation shows how to calculate how many grams $(g)$ of KCl would be produced from 4 mol KOH? The balanced reaction is: $MgCl_2+2 KOH \rightarrow Mg(OH)_2+2 KCl$ A. $\frac{4 mol KOH }{1} \times \frac{1 mol KCl }{2 mol KOH } \times \frac{74.55 g KCl }{1 mol KCl }$ B. $\frac{4 mol KOH }{1} \times \frac{2 mol KCl }{1 mol KOH } \times \frac{74.55 g KCl }{1 mol KCl }$ C. $\frac{4 mol KOH }{1} \times \frac{2 mol KCl }{2 mol KOH } \times \frac{74.55 g KCl }{1 mol KCl }$ D. $\frac{4 mol KOH }{1} \times \frac{1 mol KOH }{1 mol KCl } \times \frac{74.55 g KCl }{1 mol KCl }$

[Terjawab] Which substance is a base? HCOOH RbOH [tex]$H _2 CO _3$[/tex] [tex]$NaNO _3$[/tex]

[Terjawab] An analysis showed a sample to contain 0.00471 grams of lead. How many micrograms is this? A. $0.471 \mu g$ B. $4.71 \times 10^3 \mu g$ C. $4.71 \times 10^6 \mu g$ D. $4.71 \times 10^{-2} \mu g$ E. $4.71 \times 10^{-6} \mu g$

[Terjawab] How many molecules of chlorine are in $0.500 mol Cl _2$ gas? A. $1.20 \times 10^{23}$ molecules B. $3.01 \times 10^{24}$ molecules C. $1.20 \times 10^{24}$ molecules D. $3.01 \times 10^{23}$ molecules

[Terjawab] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Terjawab] Which response lists all the following pairs that are miscible liquids? Pair #1: octane ($C_8H_{18}$) and water Pair #2: acetic acid ($CH_3COOH$) and water Pair #3: octane ($C_8H_{18}$) and carbon tetrachloride ($CCl_4$) A. 1, 3 B. 1, 2 C. 2, 3

[Terjawab] The half-life for the zero order reaction A → Products is 276 s. What is the value of the rate constant for the reaction if the initial concentration of A is 0.789?