Which of these is a chemical change

a / fire works eploding

b/grinding powder

c/iorning shirt

What is a chemical equation? A. a substance B. a shorthand representation of a chemical reaction C. a shorthand representation of a chemical bond D. a diatomic molecule

Why isn't energy required for the passenger molecule to be carried across the cell membrane by the carrier molecules?

The light intensity of a source is 100 candelas. The illuminance on a surface is 4 lux. How far is the surface from the source?

Which is the acceleration of a 32-kg object if a 6.75-N force is applied to it? A 216.00 m/s2 B. 21.09 m/s2 C. 4.74 m/s2 D. 0.21 m/s2

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Describe the energy transformation of the teacher rubbing the match on the sandpaper.

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.