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Subatomic Particles
Periodic Table
Chemical Formulas and Reactions
Potpourri
Potpourri 2
100
The atomic mass of a certain atom of arsenic is 75 amu. A neutral atom of arsenic has 33 electrons. How many neutrons does this atom of arsenic have?
42 neutrons
100
What do elements in the same column of the periodic table have in common?
Similar chemical properties
100
What is the correct chemical formula for carbon dioxide?
CO2
100
Scientists often use a Bohr model to represent the structure of the atom. However, a more accurate representation of an atom includes a cloud surrounding the nucleus. What does the cloud represent? A. Electrons B. Neutrons C. Protons D. Quarks
A. Electrons
100
How does the periodic table show that the properties of sodium (Na) are more like the properties of lithium (Li) than like the properties of magnesium (Mg)? A. Na and Li are lighter than Mg. B. Na and Li have similar proton numbers. C. Na and Li are in the same group. D. Na and Li are in the same period.
C. Na and Li are in the same group.
200
Which of the following determines an atom's identity?
Number of protons
200
Which two elements are in the same group or family on the Periodic Table? A. fluorine and neon B. fluorine and chlorine C. chlorine and argon D. sulfur and chlorine
B. fluorine and chlorine
200
What does the law of conservation of mass state?
The total mass of the reactants equals the total mass of the products.
200
James Chadwick discovered a particle with a neutral charge that has about the same mass as a proton. Which particle within the atom did Chadwick discover?
Neutron
200
Out of the elements given below, which elements are more similar in chemical and physical properties? A. Sodium and potassium B. Sodium and magnesium C. Potassium and calcium D. Potassium and magnesium
A. Sodium and potassium
300
How does the modern atomic model describe the location of the electrons in an atom?
Within an electron cloud
300
What do elements in the same period on the periodic table have in common?
same number of energy shells (energy levels)
300
Examine the following chemical equation, which shows only the reactants and one product. Zn + 2HCl ---> ZnCl2 + ? How many Hydrogen (H) atoms must be present in the second product that is formed?
2
300
Which chemical equation is balanced? A. 2FeS + 2HCl 2FeCl2 + H2S B. 2FeS + HCl 2FeCl2 + 2H2S C. FeS + 2HCl FeCl2 + H2S D. FeS + HCl FeCl2 + 2H2S
C. FeS + 2HCl FeCl2 + H2S
300
How many atoms of hydrogen are found in acetic acid, CH3COOH?
4
400
An atom with a neutral charge has A. equal numbers of protons and neutrons B. more neutrons than protons C. more electrons than protons D. equal numbers of protons and electrons
D. equal numbers of protons and electrons
400
Which two gases make up most Earth's atmosphere? A. oxygen and carbon dioxide B. nitrogen and oxygen C. hydrogen and carbon dioxide D. water vapor and oxygen
B. nitrogen and oxygen around 78% N and 21% O
400
Which of the following equations does not demonstrate the law of conservation of mass? A. 2Na + Cl2 ---> 2NaCl B. NaOH + HCl ---> NaCl + H2O C. P4 + 5O2 ---> 2P4O10 D. SnCl2 + 2FeCl3 ---> 2FeCl2 + SnCl4
C. P4 + 5O2 ---> 2P4O10
400
Which of the following substances is classified as a compound? A. S B. Mg C. CO D. Na
C. CO
400
Which elements are found in Bi2Se3? A. Bismuth and selenium B. Bismuth and sulfur C. Boron and selenium D. Boron and sulfur
A. Bismuth and selenium
500
What is the most current model used to describe the structure of the atom? A. solar system model B. solid sphere model C. Bohr Model D. electron cloud model
C. Bohr Model
500
Which of the following statements about elements is false? A. An element is a pure substance. B. An element is made up of compounds. C. An element is represented by a chemical symbol. D. Each element has its own atomic number.
B. An element is made up of compounds.
500
What is true in every balanced equation? A. All coefficients must be multiples of 2. B. Subscripts should be changed. C. Atoms are created when products are formed. D. Mass has been conserved.
D. Mass has been conserved.
500
Which of the following chemical equations is balanced? A. 2HClO → 2H2O + 2Cl2O B. CuO + 2HCl → 2CuCl2 + H2O C. MgCl2 + NaF → MgF2 + NaCl D. 2C2H2+ 5O2 → 4CO2 + 2H2O
D. 2C2H2+ 5O2 → 4CO2 + 2H2O
500
Which period contains the elements with the greatest atomic mass? A. Period 3 B. Period 4 C. Period 5 D. Period 6
D. Period 6