January 2014 Chemistry Regents #11-20

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Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-54 Questions 55-57 Questions 58-61 Questions 62-63 Questions 64-65 Questions 66-70

Questions 71-75 Questions 76-77 Questions 78-81 Questions 82-85

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11 Which substance can not be broken down by a chemical change?

(1) ammonia  (3) ethane

(2) arsenic   (4) propanal

 
2 Link definition of an element

12 Some physical properties of two samples of iodine-127 at two different temperatures are shown in the table below.

These two samples are two different

(1) mixtures          (2) substances        (3) phases of matter       (4) isotopes of iodine

3 Link sample 1 is a solid

sample 2 is a gas

13 Powdered iron is magnetic, but powdered sulfur is not. What occurs when they form a mixture in a beaker at room temperature?

( 1) The iron retains its magnetic properties.

(2) The iron loses its metallic properties.

(3) The sulfur gains magnetic properties.

(4) The sulfur gains metallic properties.

1 Link

see video

they are mixed and therefore retain their properties

 

14 Which property is a measure of the average kinetic energy of the particles in a sample or matter?

(1) mass     (2) density       (3) pressure      (4) temperature

4 Link definition of temperature

15 According to the kinetic molecular theory, which statement describes the particles or an ideal gas?

(1) The gas particles arc arranged in a regular pattern.

(2) The force of attraction between the gas particles is strong.

(3) The gas particles are hard spheres in continuous circular motion.

(4) The collisions of the gas particles may result in the transfer of energy.

4 Link 1,2 and 3 are just not true

4 energy can be transferred is in there

16 The concentration of a solution can be expressed in

(I ) milliliters per minute

(2) parts per million

(3) grams per Kelvin

(4) joules per gram

2 Link ppm is a concentration

 

17 Two hydrogen atoms form a hydrogen molecule when

(1) one atom loses a valence electron to the other atom

(2) one atom shares four electrons with the other atom

(3) the two atoms collide and both atoms gain energy

(4) the two atoms collide with sufficient energy to form a bond

4 Link atoms need to have sufficient energy and correct orientation to react

18 What type of formula represents the simplest whole number ratio of atoms of the elements  in a compound?

(1) molecular formula

(2) condensed formula

(3) empirical formula

(4) structural formula

3 Link definition of empirical formula

 

19 The coefficients in a balanced chemical equation represent

(l ) the mass ratios of the substances in the reaction

(2) the mole ratios of the substances in the reaction

(3) the total number of electrons in the reaction

(4) the total number of elements in the reaction

2 Link a balanced equation is the mole ratio of the substances involved

20 Systems in nature tend to undergo changes toward

(1) lower energy and higher entropy

(2) lower energy and lower entropy

(3) higher energy and higher entropy

(4) higher energy and lower entropy

1 Link nature tends to be exothermic and more disordered

Questions 1-10 Questions 11-20 Questions 21-30 Questions 31-40 Questions 41-50

Questions 51-54 Questions 55-57 Questions 58-61 Questions 62-63 Questions 64-65 Questions 66-70

Questions 71-75 Questions 76-77 Questions 78-81 Questions 82-85

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