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Questions in chemistry

[Answered] Based on the Law of Conservation of Mass, what mass of products form when baking soda decomposes? NaHCO3 → Na2CO3 + H2O + CO₂ 25.00 g → ? g Give your answer to the correct number of significant figures.

[Answered] Which three of the following molecules have one or more lone pairs on the central atom? [tex]$H _2 O$[/tex] [tex]$CH _2 F_2$[/tex] HCN [tex]$NBr _3$[/tex] [tex]$SeO _2$[/tex] [tex]$SiH _4$[/tex]

[Answered] Explain which of the five types of reactions this is, and justify your answer. [tex]AlBr _3+ K _2 SO _4= KBr + Al _2( SO _4)_3[/tex]

[Answered] Identifying Metalloids Malik analyzed three samples to test which element was a metalloid. The table shows his results. | Element | Lustrous | Brittle | How It Reacts | Boiling Point (°C) | Melting Point (°C) | Electrical Conductivity | |---|---|---|---|---|---|---| | A | yes | no | base | not observed | 97.72 | high | | B | no | yes | acid | -34.04 | not observed | very low | | C | yes | yes | acid or base | not observed | 1413.85 | medium | Which element (A, B, or C) is most likely a metalloid?

[Answered] Which groups on the periodic table contain metalloids? A. Groups 1-2 B. Groups 3-12 C. Groups 13-16 D. Groups 17-18

[Answered] Which ionic compound ending would indicate that there are no polyatomic ions? A. -ate B. -ide C. -ite

[Answered] Which element in period 3 on the periodic table is a metalloid? A. magnesium (Mg) B. aluminum (Al) C. silicon (Si) D. sulfur (S)

[Answered] Which element has the smallest atomic radius? A. calcium B. potassium C. scandium D. titanium

[Answered] Predict the products of the reaction below. [tex]HClO_4+Ca(OH)_2 \rightarrow[/tex]

[Answered] If 75 g of active ingredient powder is mixed with 250 mL normal saline, what is the final concentration $(w / v)$?