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Questions in chemistry

[Terjawab] Does watermelon represent: A. a heterogeneous mixture B. an element C. a homogeneous mixture D. a compound

[Terjawab] Assume the recommended single dose of an antihistamine for a child weighing $36-47 lbs$ is 1.50 teaspoons (tsp). If 1.00 tsp contains 12.5 mg per 5 mL of the active ingredient in the antihistamine, how many milligrams of active ingredient does the recommended dose for a child weighing 36-47 lbs contain? Assume that $1.00 tsp =5 mL$. active ingredient: $\square$ mg

[Terjawab] Adding up all of the _____ of all of the individual atoms within one molecule of a compound will determine the molecular mass of the compound. A. protons B. atomic numbers C. electrons D. atomic masses

[Terjawab] Using the thermodynamic information in the ALEKS Data tab, calculate the boiling point of ethanol (C2H5OH). Round your answer to the nearest degree.

[Terjawab] Identify '$p$', '$q$' and '$r$' in the following balanced reaction: [tex]\stackrel{\text { Heat }}{p Pb(NO_3)_{2(s)}-\cdots--\ \textgreater \ q PbO_{(s)}+rNO_{2(g)}+O_{2(g)}}[/tex] A. $2,2,4$ B. $2,4,2$ C. $2,4,4$ D. $4,2,2$

[Terjawab] An organic chemist measures the temperature [tex]$T$[/tex] of a solution in a reaction flask. Here is the result: [tex]$T=32.394^{\circ} C$[/tex] Convert [tex]$T$[/tex] to SI units. Round your answer to 6 significant figures.

[Terjawab] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. [tex]$\square$ $C _6 H _{12} O _6+$ $\square$ $O _2 \rightarrow$ $\square$ $CO _2+$ $\square$ $H _2 O$[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | | :------ | :------- | :------- | | C | | | | H | | | | O | | |

[Terjawab] Which of the following is an...

[Terjawab] Which of these changes is an example of a chemical change? A. sodium making an explosion when added to water B. solid CO₂ turning into gaseous CO₂ C. water droplets forming outside a glass on a hot day D. evaporation of water from a pan

[Terjawab] Fill in the gaps to balance the equation. Use the smallest set of whole numbers to balance the equation and include coefficients of "1" when appropriate. [tex]$\square$ LiOH + $\square$ ZnCl _2 \rightarrow $\square$ LiCl + $\square$ Zn ( OH )_2[/tex] Complete the table to determine how many atoms of each element are present in the reactants and products. | Element | Reactant | Products | |---|---|---| | Li | $\square$ | $\square$ | | O | $\square$ | $\square$ | | H | $\square$ | $\square$ | | Zn | $\square$ | $\square$ | | Cl | $\square$ | $\square$ |