6. In a double replacement reaction, positive ions are exchanged between two compounds. It typically occurs in ionic, aqueous solutions and often forms a precipitate, gas, or molecular
compound.
In a lab, silver nitrate and sodium chloride were reacted to demonstrate a double replacement
reaction. Both salts dissolved in water. Ions were exchanged between both compounds and
formed a precipitate.
Write a balanced chemical equation and predict the precipitate.
A. AgNO3(aq) + NaCl(aq) - AgCl(s) + NaNO3(aq)
B. 2AgNO3(aq) + NaCl(aq) + 2AgCl(s) + NaNO3(aq)
C. SNO3(aq) + NaCl(aq) → SCI(s) + NaNO3(aq)
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D. 2SNO3(aq) + NaCl(aq) - 2SCI(s) + NaNO3(aq)

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases. as altitude increases, air density increases. air pressure and density are lowest at sea level. denser air exerts more pressure than less dense air.

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.