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Elements, Compunds and Mixtures
Reactions and Bonding
Chem vs Physical Changes
and PH
Reactions
Balancing Equations
Exothermic and Endothermic Reactions
100
Which of the following incorrectly matches the symbol with its description? A. Na+ is a charged ion B. Na is a chemical equation C. NaCl is a molecule D. NaCl + Ag2O --> AgCl + Na2O is a chemical equation
What is B. Na is a chemical equation
100
Which of the following is a compound? A Helium (He) B table salt (Sodium Chloride) C Potassium (K) D cookies & cream ice cream
What is B table salt (Sodium Chloride)
100
If a beaker contains salt dissolved in water, which method is best for separating the substances? A allow the water to evaporate, leaving only the salt in the beaker B boil the salt, leaving only the water in the beaker C use a magnet to attract the salt particles D stir the mixture with a large spoon
What is A allow the water to evaporate, leaving only the salt in the beaker
100
Which of the following statements is correct? A The particles in a liquid move around faster than the particles in a gas B The particles in a gas are farther apart than the particles in a solid C The particles in a solid move around rapidly D The particles in a gas barely move at all
What is B The particles in a gas are farther apart than the particles in a solid
100
Which of the following chemical equations represents a synthesis (or combination) reaction? A 2H2O --> 2H2 + O2 B NH4 C C + O2 --> CO2 D 2HCl + 2Ca(OH)2 --> CaCl2 + 2H2O
What is C C + O2 --> CO2
200
What is the correct name for P3O6? A Triphosphorous Hexoxide B Diphosphorous Heptoxide C Tetraphosphorous Hexoxide D Triphosphorous Monoxide
What is A Triphosphorous Hexoxide
200
The human body is primarily made up of oxygen, calcium, carbon, hydrogen, and phosphorous. These substances are all examples of: A elements B compounds C homogeneous mixtures D solutions
What is A elements
200
Which method would be best for separating a mixture of oil and small pieces of iron? A distillation B filtration using a strainer C magnetism D use tongs to pull out the pieces of iron, one at a time
What is C magnetism
200
Which of the following statements is incorrect? A a physical change does not change the identity of a substance B a chemical change typically involves a chemical reaction occurring C a chemical change does not change the identity of a substance D a physical change can often be reversed, or undone
What is C a chemical change does not change the identity of a substance
200
Which of the following chemical equations represents a neutralization reaction? A 2H2O --> 2H2 + O2 B NH4 C C + O2 --> CO2 D 2HCl + 2Ca(OH)2 --> CaCl2 + 2H2O
What is D 2HCl + 2Ca(OH)2 --> CaCl2 + 2H2O
300
How many neutrons are found in an atom of Fluorine? A 9 B 18 C 10 D 19
What is C 10
300
Which of the following statements is false? A an element is a pure substance B a mixture is made from two or more substances which retain their own properties C a compound is made up of atoms that are all identical to one another D a compound is made from two or more elements that are chemically combined
What is C a compound is made up of atoms that are all identical to one another
300
Elements can form different types of bonds with one another based on their unique chemical properties. Which of the following statements is correct regarding bonding? A ionic bonds form between two metallic elements B covalent bonds form between two nonmetallic elements C covalent bonds must always involve at least one atom of hydrogen D ionic bonds form between two similar elements
What is B covalent bonds form between two nonmetallic elements
300
Which of the following signs would not suggest that a chemical change has occurred? A the color of a substance changes B the shape of a substance changes C a substance gives off a strong odor D a substance emits heat
What is B the shape of a substance changes
300
Select the chemical equation that has been balanced correctly. A 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O B C2H6 + 4 O2 --> 2 CO2 + 3 H2O C C2H6 + 2 O2 --> 2 CO2 + 2 H2O D 2 C2H6 + 3 O2 --> CO2 + H2O
What is A 2 C2H6 + 7 O2 --> 4 CO2 + 6 H2O
400
Which type of nuclear reaction occurs when two atomic nuclei combine to form a larger nucleus, releasing large amounts of energy in the process? A nuclear fission B radioactive decay C nuclear fusion D formation of an ion
What is C nuclear fusion
400
According to the periodic table, Iron (Fe) is best classified as a... A metal B nonmetal C metalloid D noble gas
What is A metal
400
Which pair of elements is most likely to form an ionic bond? A sodium (Na) and chlorine (Cl) B sodium (Na) and potassium (K) C iron (Fe) and copper (Cu) D hydrogen (H) and oxygen (O)
What is A sodium (Na) and chlorine (Cl)
400
Which of the following statements is correct? A an acid is a substance which produces hydroxide (OH-) ions in water B an acid is a substance which produces hydrogen (H+) ions in water C strong acids are usually safe for you to touch or consume D acids and bases should never be combined
What is B an acid is a substance which produces hydrogen (H+) ions in water
400
Which of the following chemical equations provides an example of an exothermic reaction? A N2 + O2 + heat energy --> 2NO B CH4 + 2O2 --> CO2 + 2H2O + heat energy C 4Al + 3O2 --> 2Al2O3 D CO2 + 4H2 --> CH4 + 2H2O
What is B CH4 + 2O2 --> CO2 + 2H2O + heat energy
500
Which of the following elements has the greatest number of valence electrons? A Aluminum (Al) B Sodium (Na) C Magnesium (Mg) D Sulfur (S)
What is D Sulfur (S)
500
Which of the following elements is not likely to be a conductor of heat and electricity? A Iron (Fe) B Copper (Cu) C Nitrogen (N) D Gold (Au)
What is C Nitrogen (N)
500
Butene is a hydrocarbon with the chemical formula C4H8. Write the balanced equation after it has been completely burned.
What is C4H8 + 6O2 ---> 4H2O + 4 CO2
500
Red cabbage juice is an indicator which turns pink-red in strong acids and yellow-green in strong bases. If an unknown substance causes cabbage juice to turn bright pink, what can we conclude about the substance? A Its pH is lower than 7 B Its pH is greater than 7 C Its pH is equal to 7 D The substance is most likely to be drain cleaner or bleach
What is A Its pH is lower than 7
500
What would you expect to feel if you touched your hand to a beaker containing an endothermic reaction? A You would feel nothing. C The beaker would feel hot. B The beaker would feel cold. D You cannot touch a beaker containing an endothermic reaction; you would burn your hand!
What is B The beaker would feel cold.