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Questions in chemistry

[Free] Word Study. Directions: Read and study the following vocabulary words and definitions. Then use each word in a sentence that relates to the information from this unit. matter-the material from which all things on Earth are made solid-a state of matter with a definite shape and weight, which has length, width, and height liquid-a state of matter with no definite shape or form except the container it is in gas-a state of matter with no definite shape, form, or boundaries condensation-the change of water vapor to a liquid in cooler temperatures

[Free] In chemistry, there is a class of compounds called alkanes. They have the general formula [tex]$C _x H _{2 x+2}$[/tex], where C stands for a carbon atom and [tex]$H$[/tex] stand's for a hydrogen atom. The subscript [tex]$x$[/tex] stand's for the number of carbon atoms, and the subscript [tex]$2 x+2$[/tex] stands for the number of hydrogen atoms in one molecule of the compound. \begin{tabular}{|c|c|c|} \hline Carbon atoms & Hydrogen atoms & Alkane Formula \\ \hline 1 & 4 & [tex]$CH _4$[/tex] \\ \hline 2 & 6 & [tex]$C _2 H _6$[/tex] \\ \hline 3 & 8 & [tex]$C _3 H _8$[/tex] \\ \hline & & \\ \hline \end{tabular} Suppose an alkane had 8 carbon atoms. How many hydrogen atoms would it have? A. 18 atoms B. 16 atoms C. 10 atoms D. 12 atoms Please select the best answer from the choices provided

[Free] How do you find the volume of a piece of metal in a beaker of water?

[Free] Determine the density of an object (in g/cm³) if it has a mass of 8.807 g and a volume of 2.55 ml. Report your answer with the correct number of significant units (3 sig figs in this case). Do NOT include the units in your answer.

[Free] What ion is formed when an atom of mercury $(Hg)$ loses two electrons? A. $Hg^{-1}$ B. $Hg^{-2}$ C. $Hg^{+1}$ D. $Hg^{+2}

[Free] Consider the equation below. [tex]$AgNO_3(aq)+NaCl(aq) \rightarrow AgCl(s)+NaNO_3(aq)$[/tex] Which compound is the precipitate in this chemical reaction? A. [tex]$AgNO _3$[/tex] B. NaCl C. AgCl D. [tex]$NaNO _3$[/tex]

[Free] Under which conditions would the solubility of a gas be greatest? A. high pressure and high temperature B. high pressure and low temperature C. low pressure and high temperature D. low pressure and low temperature

[Free] Use the proper number of significant figures to express each value. (a) [tex]$97.3+1.00-56.0=$ (b) [tex]$\left(2.8 \times 10^5\right)\left(9.99 \times 10^3\right)=$\times 10^9[/tex] (c) [tex]$\frac{52.0 \times 10^4}{3.75 \times 10^{-2}}+4.37 \times 10^2=$

[Free] According to the kinetic-molecular theory, the average kinetic energy of gas particles depends on which factor? A. volume B. pressure C. temperature D. number of particles

[Free] Collect data: Beginning with Na, record the number of energy levels, number of protons, and atomic radius for each element in period 3. | Element | Na | Mg | Al | Si | P | S | Cl | Ar | |---|---|---|---|---|---|---|---| | Number of energy levels | | | | | | | | | Number of protons | | | | | | | | | Atomic radius (pm) | | | | | | | |