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Questions in chemistry

[Homework Help] What is the formula for magnesium phosphide? MgP $Mg _3 P _2$ $Mg _3\left( PO _4\right)_2$ $Mg _3\left( PO _3\right)_2$

[Homework Help] An organic chemist measures the temperature T of a solution in a reaction flask. Here is the result: T = 141.0 °C Convert T to SI units. Round your answer to 3 significant figures.

[Homework Help] A chemical reaction is described by the following equation: [tex]Mg(OH)_2(aq)+2 HCl_{(aq)} \rightarrow MgCl_2(aq)+2 H_2 O_{(l)}[/tex] What type of reaction is this? Which of the statements below best describes this reaction? A. One compound breaks down into two or more substances. B. Two or more substances combine to form one compound. C. A hydrocarbon combines with oxygen to form carbon dioxide and water. D. One of the elements in a compound is replaced. E. Two compounds swap "partner" elements with each other.

[Homework Help] How many protons are in this sodium ion? ${}_{11}^{23} Na^{+}$

[Homework Help] A student sets up and solves the following equation to solve a problem in solution stoichiometry. Fill in the missing part of the student's equation. [tex](0.20 L)\left(\frac{1 mL}{10^{-3} L}\right)(0.60 \square)\left(\frac{1 kg}{10^3 g}\right)=0.12 kg[/tex]

[Homework Help] What is the formula for copper(II) oxide? A. [tex]$CuCO _4$[/tex] B. [tex]$Cu _2 O$[/tex] C. CuO D. [tex]$CO _2$[/tex]

[Homework Help] Which is mostly methane? A. oil B. natural gas C. coal waste D. propane

[Homework Help] A chemical reaction is described by the following equation: [tex]2 K_2 O_{(s)} \rightarrow 4 K_{(s)}+O_{2(g)}[/tex] What type of reaction is this? Which of the statements below best describes this reaction? A. One compound breaks down into two or more substances. B. Two or more substances combine to form one compound. C. A hydrocarbon combines with oxygen to form carbon dioxide and water. D. One of the elements in a compound is replaced. E. Two compounds swap "partner" elements with each other.

[Homework Help] An ion has 19 protons, 20 neutrons, and 18 electrons. What is the correct isotope notation? A. ${}_{19}^{39} K^{-1}$ B. ${}_{19}^{39} K^{+1}$ C. ${}_{18}^{19} K^{+1}$

[Homework Help] What is the charge on the cobalt in cobalt(II) nitride?