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Questions in chemistry

[Homework Help] The equation below shows a reaction that produces calcium carbonate. [tex]Ca(OH)_2(s)+CO_2(g) \rightarrow CaCO_3(s)+H_2 O(l)[/tex] Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster? A. Lower the temperature. B. Use larger pieces of calcium hydroxide. C. Lower the pressure. D. Reduce the volume of the container.

[Homework Help] Which of the following potentially cancerous compounds are found in AFFF? A. Primary carbons B. Perforated carbons C. Purified carbons D. Perfluorinated carbons Foam prevents potential flammable sources from igniting and extinguishes already burning fuel so A. reducing fuel temperature B. suppressing flammable vapors C. preventing oxygen from contacting the fuel source D. forming a blanket layer over the combustible liquids E. reacting with the fuel source to change its chemical composition

[Homework Help] Which of the following correctly shows an ion pair and the ionic compound the two ions form? A. [tex]$Sn ^4, N^3: Sn _4 N_3$[/tex] B. [tex]$Cr ^{3+}, 1$ : Cr1[/tex] C. [tex]$Cu ^{2+}, O ^{2-} ; Cu _2 O _2$[/tex] D. [tex]$Fe ^{3+} \cdot O ^{2-}: Fe _2 O _3$[/tex]

[Homework Help] Select the most likely product for this reaction: [tex]KOH ( aq )+ CO _2(g) \rightarrow[/tex] ? A. [tex]K _2 CO _3( aq )+ H _2 O ( l )[/tex] B. [tex]K ( s )+ H _2(g)+ O _2(g)[/tex] C. [tex]K ( s )+ CO _3(g)+ H _2[/tex]

[Homework Help] If we have a sample of silicon $(Si)$ atoms that has 14...

[Homework Help] The picture shows a wooden bowl. The pieces of wood used for this bowl were dyed different colours. The artist who made the bowl explained why he dissolved the coloured dyes in methanol. I use different coloured dyes dissolved in methanol. I use methanol because with dyes dissolved in water the wood needs to be soaked for a longer time. The bowl dries more quickly if I use methanol instead of water. (a) The artist uses methanol instead of water. Give two reasons why. 1. 2.

[Homework Help] Which is a characteristic of a homogeneous mixture that is a liquid? A. It exhibits the Tyndall effect. B. Brownian motion is not visible in it. C. It cannot be separated using filtration. D. It has at least two phases.

[Homework Help] Alkalinity tests on a mud give a P_m value of 5.0 and a P_f value of 0.7. Determine the approximate amount of undissolved lime in the mud. The volume fraction of water in the mud is 80%.

[Homework Help] A compound is $40 \%$ carbon, $6.7 \%$ hydrogen, and $53.3 \%$ oxygen. What is the empirical formula? A. $CH _2 O _2$ B. $CH _2 O$ C. $C _2 H _4 O$ D. $C _2 H _4 O _2$

[Homework Help] What do aerosols, the atmospheric particles, consist of? A. Solid and liquid B. Water and carbon dioxide C. Gas and water vapor D. Nitrogen and oxygen