Which action demonstrates a chemical change? A. ice melting into water B. wood becoming charred and black from burning C. water evaporating from a sugar solution, leaving behind sugar crystals D. a balloon suddenly popping

Calcium hydroxide and hydrochloric acid react to form calcium chloride and water as shown in the chemical reaction.

Identify the single replacement reaction (s) among the following reactions. A) HCl + NaOH NaCl + H2O B) CH4 + 3O2 CO2 + 2H2O C) 2AgNO3 (aq) + Zn (s) 2Ag (s) + Zn (NO3) 2 (aq)

If a what and a what is close enough they wil form a nova

What's a standard unit of measurement?

A sample of sodium dichromate, Na2Cr2O7, is placed into a container by itself. The sample of material in the container is analyzed, and it is found to contain exactly 0.67 moles of sodium atoms. How many moles of oxygen atoms are in this sample?

Carbon monoxide reacts with oxygen to form carbon dioxide. 2 CO (g) + O2 (g) → 2C02 (8) In a 1.00 L flask, 3.40 atm of CO reacts with 2.60 atm of O2. Assuming that the temperature remains constant, what is the final pressure in the flask? 4.30 atm 2.

The nerves that Branch out from the spinal cord and connect to the body

The term southern oscillation most nearly refers to

Which kelvin temperature is equivalent to 20°C

When a piece of magnesium metal is added to hydrochloric acid, what gas is produced?