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Questions in chemistry

[Free] Consider the chemical formula for calcium chlorate: [tex]$Ca (ClO_3)_2$[/tex] How many of each of these atoms is in a molecule of calcium chlorate? Ca: $\square$ Cl: $\square$ O: $\square$

[Free] Which statement accurately describes the chemical symbol of an element? A. The chemical symbol is always a single letter. B. The chemical symbol always starts with the same letter as the name of the element. C. The chemical symbol always begins with a capital letter. D. The chemical symbol can be shared by more than one element.

[Free] Which is a substance that is made up of only one type of atom? A. compound B. element C. solution D. mixture

[Free] A substance is made up of slow-moving particles that have very little space between them. Based on this information, what can most likely be concluded about this substance? A. It is not a gas because its particles do not move continuously. B. It is a gas because its particles move continuously in a straight line. C. It is not a gas because its particles do not have large spaces between them. D. It is a gas because its particles move in many different directions.

[Free] Use the table to answer the question. \begin{table} \captionsetup{labelformat=empty} \caption{Elements with Their Electronegativity} \begin{tabular}{|c|c|} \hline Element & Electronegativity \\ \hline bromine & 2.8 \\ \hline oxygen & 3.5 \\ \hline nitrogen & 3.0 \\ \hline phosphorus & 2.1 \\ \hline \end{tabular} \end{table} Based on the information in the table, which pair of elements would likely form the least polar bonds with each other? A. oxygen and phosphorus B. nitrogen and oxygen C. bromine and nitrogen D. phosphorus and bromine

[Free] What is the temperature of 0.80 mol of a gas stored in a 275 mL cylinder at 175 kPa? Use [tex]P V=n R T[/tex] and [tex]R=8.314 \frac{L \bullet kPa }{ mol \bullet K }[/tex].

[Free] What is the density of hydrogen gas (in $g / L$ ) if 5.05 liters has a mass of 1.29 g ? Report your answer using only 3 decimal places. Do NOT include the units.

[Free] A student sets up the following equation: [tex]\frac{(0.48 L)\left(\frac{1 mL}{10^{-3} L}\right)\left(0.54 \frac{g}{mL}\right)}{\left(139.31 \frac{g}{mol}\right)}=? 139.79 mL[/tex] Enter the units of the student's answer.

[Free] Which describes the volume of 1 mol of gas at standard temperature and pressure? A. The volume is greater for a larger mass of gas. B. The volume is the same for any gas. C. The volume depends on the size of the container. D. The volume varies with the pressure.

[Free] Write at least one mathematical equation that represents the law.