Study+Guide+for+First+Semester+2

1)Density= Mass/Volume Example: M= 12.50 g/ V=4.6 ml

D=12.50 g/ = 2.717 g/ml V= 4.16 ml

Multiplication and Division rule for significant digit: Your answer cant have more significant digits than measurements.

So you round 2.717 g/ml to 2.7 g/ml

2) Significant digits - With decimal present (pacific) count from left to right starting with first non-zero number - With decimal present (Atlantic) count from right to left starting with the first non-zero number

3) Classification of Matter

- Elements, Compounds, and Mixtures.

Elements: 2 or more elements combined in a fixed ration Compound: can be chemically broken Mixture: is separated and can be combined physically by 2 or more pure substances

4)

10) In a calcium in the ground state, the electrons that posses the least amount of energy are located in the -->in the first shell, it is the least amount of energy it only goes up to two.

16) Which isotopic notation represents an atom of carbon-14 -->isotopic when an atoms neutron changes, but the protons does not change. carbon proton is 6 and it shows that the atomic mass is 14.

17) Which statement identified the element arsenic? -->arsenic is an element so you can find it in the reference table. look at table S: Properties of Selected Elements. and look at the periodic table of the elements.

18) Which particle is emitted when an atom of Kr-85 spontaneously decays? -->an alpha particles and a beta particle are the only decaying mode. look in the reference table, on table N: Selected Radioisotopes. you will find in the nuclide colum, where you will find 85Kr and you can see that the decay mode is beta.

20. the periodic table is organized in order of increasing atomic number, or numbers of protons in the nucleus of an atom some of the forerunners of the periodic table organized elements in terms of mass and similarities in chemical properties, but today, we organize it in order of atomic number

21. Anitomy’s atomic number is 51 and it is a metalloid because it has both properties of a metal and a non-metal.

22. Sulfur is not a metal so it is a bad conductor of heat. Since non-metals don’t conduct heat while metals do conduct heat.