Quarter Test Review Game

Pick A Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Question 1 Which data is the dependent variable in this experiment? A) heat B) temperature C) mass D) density

Question 1 Which data is the dependent variable in this experiment? B) temperature Return

Question 2 What is the first step that should be taken when a caustic chemical gets into a person’s eye? A) identify the chemical B) call for an ambulance C) flush the affected area with water D) apply a neutralizing agent

Question 2 Answer C) Flush the affected area with water Removing the chemical as quickly as possible will diminish the chance of permanent injury to the eye. Return

Question 3 The following data were collected. The volume of the gas is known to be 2.20 L This data reflects A) high precision and high accuracy B) high precision and low accuracy C) low precision and high accuracy D) low precision and low accuracy

Question 3 Answer B) high precision and low accuracy The readings are all very close to each other, demonstrating high precision. The readings are also all far from the accepted value, showing low accuracy. Return

Question 4 The reaction times for three trials of an experiment are 90.3, 90.2, and 90.5 seconds. What is the average time expressed using the correct number of significant figures? A) 90.333 B) 90 C) 90.33 D) 90.3

Question 4 Answer D) 90.3 All of the numbers have three significant figures, so the answer should have three significant figures Return

Question 5 How many protons are in a fluorine atom? A) 9 B) 10 C) 19 D) 28

Question 5 Answer A) 9 The atomic number of fluorine is 9. Remember, atomic number = number of protons = number of electrons Return

Question 6 Which of the following atoms has 6 valence electrons? A) fluorine B) oxygen C) nitrogen D) carbon

Question 6 Answer B) oxygen Oxygen is in group 16, so it has 6 valence electrons. It has an electron configuration of 1s22s22s4. The electrons in the 2nd level (s and p!) are the valence electrons Return

Question 7 Which of the following atoms has valence electrons in the 2p subshell? A) Cl B) Mg C) N D) Be

Question 7 Which of the following atoms has valence electrons in the 2p subshell? A) Cl – valence electrons in 3s, 3p B) Mg – valence electrons in 3s only C) N (answer) – 1s22s22p3 D) Be – valence electrons in 2s only Return

Question 8 The mass of an electron is: A) Greater than the mass of a proton B) The same as the mass of a proton C) The same as the mass of a neutron D) Less than the mass of a neutron

Question 8 Answer D) Less than the mass of a neutron The mass of an electron is roughly 1000 times less than that of a proton and a neutron. The mass of a proton and a neutron are about equal. Return

Question 9 Which atom has the following electron configuration: 1s22s22p63s23p5 ? A) Neon B) Magnesium C) Sulfur D) Chlorine

Question 9 Answer D) Chlorine Adding the superscripts provides the number of electrons, which is equal to 17. Number of electrons = atomic number, providing chlorine. Return

Question 10 Which of the following elements has the largest atomic radius? A) Be B) Mg C) Ca D) Sr

Question 10 Answer D) Sr Atomic radius increases as you go down the periodic table and energy levels are added. Strontium is the farthest down, thus it is the largest. Return

Question 11 Which of the following elements has the greatest electronegativity? A) F B) Cl C) Br D) I

Question 11 Answer A) Fluorine Electronegativity decreases from top to bottom. Fluorine is highest on the periodic table, so it has the highest electronegativity. Return

Question 12 Which group contains the least reactive elements on the periodic table? A) noble gases B) halogens C) alkaline earth metals D) alkali metals

Question 12 Answer A) noble gases Noble gases have a full set of eight valence electrons, so they have no reason to react. Return

Question 13 Which of the elements below forms an ion with a -1 charge? A) Argon B) Chlorine C) Sulfur D) Phosphorous

Question 13 Answer B) Chlorine Chlorine starts with seven valence electrons, so it gains one more electron to fill its octet. When chlorine gains the electron, it takes a -1 charge. Return

Question 14 A +2 charge occurs from an atom A) gaining 2 electrons B) losing 2 electrons C) gaining 2 protons D) losing 2 protons

Question 14 Answer B) losing 2 electrons Only electrons are gained or lost in an atom. Losing electrons results in a positive charge because the ion now has 2 more positive charges than negative charges . Return

Question 15 A scientist has found the following isotope of phosphorous: 3215 P. How many protons are present in this isotope? A) 15 B) 17 C) 32 D) 47

Question 15 Answer A) 15 The number of protons = atomic number, which is the lower number on the symbol Return

Question 16 Anions are formed when neutral atoms gain A) electrons B) protons C) neutrons D) positrons

Question 16 Answer A) electrons Anions contain a negative charge. When an ion gains electrons, it has more negative charges, giving it a negative charge overall. Atoms will not gain protons or neutrons, only electrons. Return

Question 17 Which grouping identifies chemical properties? A) Malleability, ductility, conductivity B) Luster, hardness, texture C) Combustibility, flammability, reactivity D) Density, melting point, boiling point

Question 17 Answer C) Combustibility, flammability, reactivity All of these refer to chemical reactions. Only process which involve a chemical reaction are chemical properties Return

Question 18 Isotopes of an element have different A) atomic numbers B) mass numbers C) numbers of protons D) numbers of outer-shell electrons

Question 18 Answer B) Mass numbers Atomic numbers and numbers of protons do not change, ever. Isotopes refer to atoms with the same number of protons, but a different number of neutrons. As a result, the mass number (protons + neutrons) changes. Return

Question 19 Which element naturally occurs as a diatomic molecule? A) Mg B) C C) Fe D) O

Question 19 Answer D) O Oxygen is one of several atoms in the top, right section of the periodic table that exist as a diatomic molecule. ClIF H BrON Return

Question 20 Which of the following is the greatest hazard for Chemical Q? A) health B) flammability C) reactivity D) contact

Question 20 Which of the following is the greatest hazard for Chemical Q? Answer B) flammability Return

Question 21 Which radioactive particle requires several centimeters of lead as shielding protection? a) alpha b) beta c) gamma d) delta

Question 21 Which radioactive particle requires several centimeters of lead as shielding protection? Answer c) gamma Return

Question 22 The number 0.0055 has how many significant digits? A) 4

Question 22 Answer C)2 Significant figures can only be counted to the right of a nonzero number Return

Question 23 Sea water is an example of: A) Element B) Compound C) Heterogenous Mixture D) Homogenous Mixture

Question 23 Answer D) homogeneous mixture Sea water contains salt and water, which are mixed evenly throughout. This is a homogeneous mixture. Return

Question 24 Who is credited with developing the current model of the periodic table? A) Niels Bohr B) John Dalton C) Henry Moseley D) Dmitri Mendeleev

Question 24 Answer C) Henry Moseley Return

Question 25 Who developed the “plum-pudding” model of the atom? A) John Dalton B) Niels Bohr C) J. J. Thomson D) Ernest Rutherford

Question 25 Answer C) J. J. Thomson Thomson proposed the plum-pudding model after discovering the electron Return

Question 26 A piece of candy has a mass of 6.0 g. When the candy is placed in a graduated cylinder with water, the volume rises from 30 mL to 37 mL. What is the density of this substance? A) 0.86 g/mL B) 1.17 g/mL C) 6.0 mL D) 30 mL

Question 26 Answer A) 0.86 g/mL The displacement is 7.0 mL, which is the volume of the candy. Density = mass/volume, so (6.0 g/7.0 mL) = 0.86 g/mL Return

Question 27 An atom of 7935Br contains: A) 35 protons and 79 neutrons B) 35 protons and 44 neutrons C) 44 protons and 35 neutrons D) 44 protons and 79 neutrons

Question 27 Answer B) 35 protons and 44 neutrons The lower number = the number of protons. The top number = protons + neutrons. Subtract the bottom number from the top number to get the number of neutrons. Return

Question 28 How many valence electrons does nitrogen contain? A) 1 B) 3 C) 5 D) 6

Question 28 Answer C) 5 Nitrogen has five valence electrons in Group 15 Return

Question 29 Chlorine, Cl, is most like which of the following elements in its chemical and physical properties? A) Lithium, Li B) Helium, He C) Fluorine, F D) Sulfur, S

Question 29 Answer C) Fluorine Groups (vertical columns) of elements display similar chemical and physical properties because they contain the same number of valence electrons Return

Question 30 From left to right across a period, what change is occurring within the atomic nuclei? A) A proton is gained. B) An electron is gained. C) A neutron is lost. D) The electron cloud size is decreasing.

Question 30 Answer A) A proton is gained. The atomic number increases, so the number of protons increases. The number of electrons increases, but electrons are not in the nucleus. Return

Question 31 Which of these is an ion with a charge of +1? A) 1 B) 2 D) 4

Question 31 Answer A) 1 The first ion had one more proton than electron, giving it a net charge of +1. Return

Question 32

Question 32 Answer Shielding effect is the same across a period, so the element must be in the same row as potassium Return

Question 33 Free Point 

Question 33 Free Point  Return

Question 34

Question 34 Answer: C argon Chlorine starts with 17 electrons. When chlorine gains an electron, it has 18 electrons, which is the same number as argon Return Return

Question 35

Question 35 Answer If an atom has a lower mass and more protons, the neutrons must be lower. Return

Question 36 Element X has a half-life of 20 minutes. How many grams of a 32 g sample of element X would remain after 80 minutes? A) 1 g B) 2 g C) 4 g D) 8 g

Question 36 Element X has a half-life of 20 minutes. How many grams of a 32 g sample of element X would remain after 80 minutes? B) 2 g 20 min – 16 g 40 min – 8 g 60 min – 4 g 80 min – 2 g Return

Question 37 Which of the following is a mixture? A) Carbon B) Glucose C) Distilled water D) Air

Question 37 Answer D) Air Carbon is an element. Glucose (C6H12O6) is a compound. Distilled water is purified H2O. Air contains several gases, including N2, O2, and CO2. Return

Question 38 A scientist has found the following isotope of potassium: 3919 K How many neutrons are present in this isotope? A) 19 B) 20 C) 39 D) 58

Question 38 Answer B) 20 The top number is mass number (protons + neutrons). The bottom number is atomic number (protons). Subtracting the bottom number from the top gives the correct number of neutrons Return

Question 39 An analytical balance measures a 200.0 g standard mass at 205.0 g. What is the percent error of the balance A) 2.0 % B) 2.4 % C) 2.5 % D) 97.6%

Question 39 Answer C) 2.5 % Percent Error = [(205-200)/200 ] x 100 = 2.5 % Return

Question 40 How many kilometers are equivalent to 35 meters? A) 35000 km B) 3500 km C) 0.35 km D) 0.035 km

Question 40 How many kilometers are equivalent to 35 meters? D) 0.035 km 35 meters x (1 km / 1000 m) = 0.035 meters Return