17. Chemistry is concerned about a. the properties and interactions of matter C. and energy the properties of the subtances composing the matter b. a. 1.34 b. 1.62 18. Ethyl alcohol has a chemical formula of C₂H5OH. How many moles are there in 125g of ethyl alcohol. C. 2.45 d. 2.71 19. Which statement is true? a. b. Atoms and elements are the same concept Some matter consists of atoms a. 1,1,1 b. 2,1,2 a. b. 21. Which element is a metalloid? d. 20. Determine the coefficients (x,y,z) that balance/s the equation. cobalt boron the earth's physical structure and substance Both a and b C. Oxygen atoms combine to form a compound d. Both a and c (x)O₂+(y) PCl3→(z) POCl3 1,2,2 Answer is not among the choices C. d. C. d. selenium Both b abd c

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States of Matter

The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates). 

Chemical Reactions and Equations

When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.