How do you know when a chemical reaction has taken place?

How do classic sedimentary rocks form? Question 2 options: A. Fragments of rock are squeezed and cemented together. B. Plant and animal remains are squeezed and cemented together. C. Solid chemicals in water harden and form rocks. D.

Which two properties are characteristic of ionic compounds?

If an isotope of oxygen (O) has 1 less neutron, how many electrons does it have? and If an isotope of sodium (Na) has 2 extra neutrons, what is it's atomic weight?

Angie mixes the fertilizer for her plants at the beginning of the week. She puts 40 g of the fertilizer-water solution in each of seven closed containers and uses one container each day to water her plant.

Describe how the r group in each of the 20 differebt amino acids determines each amino acid's characteristics

How many atoms are in 151 g of calcium?

Which statements about the formation of the solar system are true and in a correct order? A. A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects. B.

Which is an important step in the alternate method for balancing equations in redox reactions? a) indicating the types of bonds found in the molecules. b) determining the speed at which reactions take place.

How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2

An ecosystem contains all the biotic and abiotic factors in an area. answers true or false