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Questions in chemistry

[Terjawab] Which element is classified as a noble gas? A. N B. Cl C. Xe

[Terjawab] How would one convert 125 lb to kilograms $(1 oz =28 g)$? A. $125 lb \times \frac{16 oz }{1 lb } \times \frac{28 g}{1 oz } \times \frac{1 kg}{1000 g}$ B. $125 lb \times \frac{28 g}{1 oz }$ C. $125 lb \times \frac{16 oz }{1 lb } \times \frac{28 g}{1 oz }$ D. $125 lb \times \frac{28 g}{1 oz } \times \frac{1 kg}{1000 g}$

[Terjawab] Using the information in the table, calculate the average atomic mass of strontium. Report to two decimal places. [tex] \square [/tex] amu | Strontium | |---|---|---| | Isotope | Mass (amu) | Abundance | | Sr-84 | 83.913428 | 0.56% | | Sr-86 | 85.909273 | 9.86% | | Sr-87 | 86.908902 | 7.00% | | Sr-88 | 87.905625 | 82.58%

[Terjawab] Select the best answer for the question. 20. On Earth, where is hydrogen not found? A. Water B. Natural gas well C. Atmosphere D. Mine

[Terjawab] 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

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

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

[Terjawab] 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. $Ca < Sr < Be$

[Terjawab] 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]

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