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Questions in chemistry

📝 Answered - What type of chemical reaction occurs when calcium oxide is mixed with water? (i) Combination reaction (ii) Decomposition reaction (iii) Displacement reaction (iv) Acid Base reaction

📝 Answered - Select the correct answer. What is the solution to the problem expressed to the correct number of significant figures? [tex]$1511+(142 \times 16.5)=?$

📝 Answered - Which of the following is a valid conversion factor? $\frac{1 cm^3}{1 L}$ $\frac{1 mL}{100 L}$ $\frac{10 m}{1 dm }$ $\frac{100 cm}{1 m}$

📝 Answered - The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of these elements regarding their ionization energy? A. $Ca < Be < Sr$ B. $Sr < Be < Ca$ C. $Be < Ca < Sr$ D. $Sr < Ca < Be$ E. $Ca < Sr < Be$

📝 Answered - Which of the following is an oxidation-reduction reaction? [tex]$SO _2(g)+ H _2 O ( l ) \longrightarrow H _2 SO _3( aq )$[/tex] [tex]$CaCO _3(s) \longrightarrow CaO ( s )+ CO _2(g)$[/tex] [tex]$Ca ( OH )_2(s)+ H _2 CO _3( l ) \longrightarrow CaCO _3( aq )+2 H _2 O ( l )$[/tex] [tex]$C _6 H _{12} O _6(s)+6 O _2(g) \longrightarrow 6 CO _2(g)+6 H _2 O ( l )$[/tex]

📝 Answered - Which term refers to a property that depends only on the amount of a substance? A. flammability B. extensive C. intensive D. reactivity

📝 Answered - Is aluminum, Al, a representative or transition element?

📝 Answered - Combustion of propane? [tex]C_3 H_3+O_2 \rightarrow H_2 O+CO_2[/tex] Answer Options: Select one of four A. The absorption of heat by the reactants B. The release of heat with the products C. An intermediary transition to butane D. Methane as a secondary product

📝 Answered - What kind of information do unit conversions give? A. Unit conversions give the size of one part of something. B. Unit conversions express a number in terms of moles. C. Unit conversions give a fractional part of a number. D. Unit conversions give an equal amount but with other units.

📝 Answered - Which element would release the most energy while adding an electron to a neutral atom in the gas phase? A. Na B. Al C. Br