Silicon dioxide powder dissolves in water. Is this a physical or a chemical change?

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?

A student prepared asprin in a lab experiment using the reaction that asprin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The Student reacted 1.50 g salicylic acid with 2.00 g acetic anhydride.

Hy is it important that a chemical equation be balanced?

How might vertical growth within a city decrease the impact of runoff and increase the opportunity for infiltration of water?

A waxing moon means the moon is becoming a waht

Which of the following requires an oxidizing agent? Al yields Al3+ 2 O yields O2 Cl2 yields 2 Cl- Ag + yields Ag

If a color change occurs when two solutions are mixed has a chemical reaction likely occurred?

Using the following thermochemical data, what is the change in enthalpy for the following reaction? Ca (OH) 2 (aq) + 2HCl (aq) → CaCl2 (aq) + 2H2O (l) CaO (s) + 2HCl (aq) →CaCl2 (aq) + H2O (l), ΔH = - 186kJ CaO (s) + H2O (l) →Ca (OH) 2 (aq), ΔH =

1. Calculate the end velocity of a rocket that traveled 16km in 2 seconds. distance time 2. Calculate the rockets acceleration m with a start velocity of 0m/s and the end velocity from #1 for 10 seconds.

How are linear and nonlinear graphs alike