When a drawing made with a black marker gets wet, the marker bleeds and more separates into several colors. What method of separation does this describe?

1. evaporation

2. distillation

3. filtration

4. chromatography

What layer in the atmosphere contains the ozone layer

How many valence electrons are in a silicon atom?

How is all energy connected? a. Energy is connected as it constantly moves from one place to another. b. Energy is connected through light waves c. Energy is not connected. d. Energy is connected through chemical bonds.

Which factors affect the type of cloud that will be formed? Select three choices.

Which unstable element is used to determine the age of volcanic rock? argon carbon-14 potassium carbon-12

Energy stored in the bonds that hold together the atoms and molecules of all substances is called Energy stored in the bonds that hold together the atoms and molecules of all substances is called

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.