Is activated charcoal mixed with toothpaste a physical or chemical change?

When ammonium chloride is dissolved in water, the beaker gets cold. which type of reaction does this describe?

NaCl + H2SO4 - --> Na2SO4 + HCl Balance the double replacement chemical reaction.

3 The volume of a gas is 50.0 mL at 20.0 K. What will be the new temperature if the gas is compressed to 10.0 mL under constant pressure? A 100 K B 10.0 K C4.00 K D 5.00 K

Consider the reaction of Mg3N2 with H2O to form Mg (OH) 2 and NH3. If 4.33 g H2O is reacted with excess Mg3N2 and 6.26 g of Mg (OH) 2 is ultimately isolated, what is the percent yield for the reaction?

What do we call the set of compounds that are on the left of the reaction arrow

Prepare a solution that is 0.1 M acetic acid and 0.1 M sodium acetate by measuring out 5.0 mL of the 1.0 M acetic acid solution and 5.0 mL of the 1.0 M sodium acetate solution in a 100 mL graduated cylinder, diluting the 10.

Which element has an ion that is smaller than an ion of calcium?

Which factor is responsible for the weak attraction between diatomic molecules of the halogens (group 7A) ? A) Hydrogen bonding B) Ionic bonding C) Dipole interactions D) London dispersion forces

Which is the correct equation for refractive index?

Alcl3) and lithium sulfate (li2so4) (note - this is a double replacement reaction. you need this information to predict the products of the reaction)