Wnich action forms a different chemical substance?

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A

crushing a rock

B

burning a piece of wood

с

mixing salt and pepper

D

melting an ice cube

Describe the reason why a reaction between two substances comes to an end.

All of the covalent carbon-carbon bonds in unsaturated hydrocarbons share 2 pairs of electrons. True False

Densities of solutions of sodium hydroxide and water at 20 °C are given by the equation: p 1.003 + 1.06Wao where p is the density of the solution in g/cm (grams of solution per cm3 of solution) and wNaOH is the weight fraction of sodium hydroxide.

The activity of a certain isotope dropped from 3200 ci to 800 ci in 24.0 years. what is the half-life of this isotope (in years) ? show your work.

Which term describes the maintenance of a stable internal condition a.) endosytosis b.) homeostasis c.) mitosis d.) photosynthesis

During an Experiment a scientist notes that a sample turned red. which kind of data did the scientist record A. average data B. quantitative data C. measured data D. qualitative data

Why is chemistry important for the study of living things

How much does radon cost per gram

What is wrong with rutherford's model of the atom

What do the numbers listed for an element on the periodic table represent? The smaller number is the number of protons, and the greater number is the mass. The smaller number is the number of neutrons, and the greater number is the number of protons.