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Questions in chemistry

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

[Answered] 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. $4.71 \times 10^{-6} \mu g$

[Answered] 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

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

[Answered] 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

[Answered] 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?

[Answered] What leads to the formation of an ionic bond with $Hg^{2+}$? A. the attraction of a noble gas B. the attraction of an $NH_4^{+}$ ion C. the attraction of a group 1 element D. the attraction of an $SO_4^{2-}$ ion

[Answered] How many atoms does 32 g of sulfur contain? A. $32 \times\left(6.02 \times 10^{23}\right)$ B. $\frac{6.02 \times 10^{23}}{16}$ C. $6.02 \times 10^{23}$ D. $\frac{6.02 \times 10^{23}}{32}$

[Answered] Complete this activity to identify basic chemical structure. Match the words to their definitions. Match each item to a choice: Choices: Molecule Atom The basic unit of matter Chemical combinations of two or more atoms

[Answered] Classify each of the following compounds according to its functional group. a. [tex]$CH _3- CH _2- CH = CH - CH _3$[/tex] b. [tex]$CH _3- CH _2- CH _2- OH$[/tex] c. [tex]$CH _3- CH _2- CH _2- O - CH _2- CH _3$[/tex] d. e.