Which of the following is not an example of a chemical change?

Food digesting

Water evaporating

A car rusting

An egg cooking

According to the law of conservation of matter, which statement about chemical reactions is true? Atoms cannot be created or destroyed by chemical reactions. Every atom destroyed in a chemical reaction must be replaced.

4 Recall What holds ionic compounds together?

Sand is made up of silicon dioxide, SiO2 (molar mass=60.). How many silicon atoms are in a smgle grain of sand weighing 55.2 micrograms?

What is the oxidation state of cobalt in cocl2 6h2o?

What minimum volume of 0.200 m potassium iodide solution is required to completely precipitate all of the lead in 195.0 ml of a 0.194 m lead (ii) nitrate solution?

If the bond enthalpy for a C-C bond is 348 kJ, what will happen when the C-C bond is formed?

How do you find moles

What volume of 0.500 M AgNO3 are needed to react with 100. mL of 0.400 M K2CrO4? 2 AgNO3 (aq) + K2CrO4 (aq) ➔ Ag2CrO4 (s) + 2 KNO3 (aq)

Nonpolar substances do not dissolve in polar solvents like water. If you're conducting an investigation to test the solubility of different substances, which on these substances do you expect to be insoluble in water? A. ammonia (NH3) B.

You mix together two different substances. There is a loud noise, and a burst of flame. Which of the following is most likely to be true?