Carbon Flashcards
What is the chemical name for $CO_2$?
“Carbon dioxide (Carbon(IV) oxide)”
What percentage of the atmosphere is carbon dioxide?
“About 0.03%”
Name a compound in which carbon dioxide is found.
“Metallic trioxocarbonates(IV) and hydrogentrioxocarbonates(IV)”
Give an example of a metallic trioxocarbonate(IV).
“Calcium trioxocarbonate (IV) (limestone)”
Write the equation for the laboratory preparation of carbon dioxide using calcium trioxocarbonate(IV) and hydrochloric acid.
“$CaCO_{3}(s) + 2HCl(aq) \rightarrow CaCl_{2}(aq) + H_{2}O(l) + CO_{2}(g)$”
What kind of apparatus is used to produce carbon dioxide on demand in the lab?
“Kipp’s apparatus”
How is carbon dioxide collected in the lab and why?
“By downward delivery because it is heavier than air.”
List 3 physical properties of carbon dioxide.
“Colourless
What happens to damp blue litmus paper in carbon dioxide and why?
“It turns pink because carbon dioxide dissolves in water to yield trioxocarbonate(IV) acid.”
What is ‘dry ice’?
“Solidified carbon dioxide at -78°C”
Write the equation for the reaction of carbon dioxide with water.
“$CO_{2}(g) + H_{2}O(l) \longrightarrow H_{2}CO_{3}(aq)$”
Is the product of the reaction between carbon dioxide and water acidic, alkaline or neutral?
“Acidic”
Write the equation for the reaction of carbon dioxide with sodium hydroxide.
“$CO_{2}(g) + 2NaOH(aq) \rightarrow Na_{2}CO_{3}(aq) + H_{2}O(l)$”
Does carbon dioxide support combustion?
“No”
Write the equation for the reaction of carbon dioxide with burning magnesium.
“$CO_{2}(g) + 2Mg(s) \rightarrow 2MgO(s) + C(s)$”
What are the products of the reaction between carbon dioxide and red-hot carbon?
“Carbon(II) oxide (CO)”
How do you test for carbon dioxide gas?
“Bubble it through lime water; if it is carbon dioxide
Write the equation for the test for carbon dioxide gas.
“$Ca(OH){2}(aq) + CO{2}(g) \rightarrow CaCO_{3}(s) + H_{2}O(l)$”
Name 2 uses of carbon dioxide.
“Fire extinguishers; putting out petrol or oil fires”
How does a soda-acid fire extinguisher work?
“Acid reacts with sodium trioxocarbonate(IV) to produce carbon(IV) oxide which puts out the fire.”
Name other uses of carbon dioxide.
“For the manufacture of baking soda
What is the importance of carbon dioxide in plants?
“Essential for photosynthesis
What is the greenhouse effect?
“The warming of the Earth due to carbon (IV) oxide and other gases in the atmosphere which trap heat.”
What are the effects of increased carbon dioxide in the atmosphere?
“Contributes to the greenhouse effect and global warming
What is carbon(II) oxide?
“A colourless
Is carbon(II) oxide soluble in water?
“Very slightly soluble.”
Is carbon(II) oxide acidic, alkaline or neutral?
“Neutral”
Is carbon(II) oxide flammable?
“Yes
Is carbon(II) oxide toxic?
“Yes
How does carbon(II) oxide act as a poison?
“It combines with haemoglobin in the blood
Write the equation for the laboratory preparation of carbon(II) oxide.
“$HCOOH(aq) \overset{H_2SO_4}{\longrightarrow} CO(g) + H_2O(l)$”
Name a use of carbon(II) oxide.
“As a reducing agent in the extraction of metals.”
What is a fuel gas containing carbon(II) oxide?
“Water gas (mixture of carbon(II) oxide and hydrogen)”
What is the test for Carbon(II) oxide?
“It burns with a blue flame and reduces copper(II) oxide to copper.”
What are carbides?
“Binary compounds of carbon with metals or boron and silicon.”
Give examples of metallic carbides.
“Calcium carbide ($CaC_2$)
What are the uses of carbides?
“Calcium carbide is used to prepare ethyne (acetylene); metallic carbides are used as cutting tools.”
What are silicon carbides used for
“Abrasives”
What are trioxocarbonates(IV) also known as?
“Carbonates”
Are metallic trioxocarbonates(IV) soluble or insoluble in water?
“Insoluble
What happens when you heat metallic trioxocarbonates(IV)?
“They decompose to give carbon(IV) oxide and metallic oxide.”
Name a naturally occurring metallic trioxocarbonate(IV).
“Limestone (calcium trioxocarbonate(IV))”
What is the formula of dolomite?
“$MgCO_3.CaCO_3$”
What happens when carbon dioxide is passed through lime water?
“Lime water turns milky due to the formation of a white precipitate of calcium trioxocarbonate(IV).”
Write the equation for the reaction of carbon dioxide with lime water.
“$Ca(OH)_2(aq) + CO_2(g) \longrightarrow CaCO_3(s) + H_2O(l)$”
What happens when excess carbon dioxide is passed through lime water?
“The milkiness disappears as calcium hydrogentrioxocarbonate(IV) is formed.”
Are hydrogentrioxocarbonates(IV) soluble or insoluble in water?
“Soluble”
What happens when hydrogentrioxocarbonates(IV) are heated?
“They decompose to give carbon(IV) oxide
What is carbon (IV) sulphide also known as
“Carbon disulphide”
What is the appearance of carbon (IV) sulphide
“A colourless liquid with an offensive smell”
Is carbon (IV) sulphide soluble in water
“Insoluble”
What is carbon (IV) sulphide soluble in
“Organic solvents”
Is carbon (IV) sulphide flammable
“Highly flammable”
What are the uses of carbon (IV) sulphide
“As a solvent for rubber
What is the oxidation state of carbon in carbon sulphide
“+4”
