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To which class does the element chromium (Cr) belong? |
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The correct symbol for the ion formed by nitrogen is: |
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Which of the following combinations of elements in a compound would be molecular?
A) Sodium and Nitrogen
B) Calcium and Oxygen
C) Nitrogen and Oxygen
D) Potassium and Chlorine
E) Sodium and Sulfur |
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Which of the following combinations of elements in a coupound would be ionic? A) Barium and Fluorine B)Nitrogen and OXygen C) Sulfur and OXygen D) Phosphorus and Oxygen E) All of these
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Based on common charges, which formula for an ionic compound is incorrect? A) CaCl, B) NaF, C) SrO, D) MgS, E) K3P |
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Based on common charges, which formula for an ionic compound is incorrect?
A) Ba(NO3)2, B) Ca(OH)2, C) MgCl3, D) Al2O3, E) KBr |
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Which of the following formula/name pairs is incorrect?
A) CO caron monoxide
B) CaO calcuim oxide
C) MgCl2 Magnesium Chloride
D) AlP aluminium Phosphide
E) Li2SO3 dilithium Sulfite |
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Definition
E) Li2SO3 dilithium Sulfite |
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Correct formula for tetraphosphorus Hexasulfide |
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The correct formula for dinitrogen pentoxide |
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The correct formula for tetraphosphorus Hexoxide |
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A 1-ounce serving of Cheetos has 2.90 times 10 squared mg of sodium. What is the mass equivalent to in units of grams? |
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Definition
0.290 g (Divide the above formula by 1000 to switch mg to g) |
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A can of cashews has a mass of 8.5 ounces. What is the miass in g? (16 ounces =453.6g) |
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Nonelectrolytes are compounds which break apart into ions when dissolved in water.
True or False |
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A molecular compounds is composed of atoms of a metal and a nonmetal.
True or false |
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Most molecular comounds remain as molecules when dissolved in water.
True or false |
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Water is considereda mixture because it consists of hydrogen and oxygen.
True or false |
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The larger the sample of a given substance, the more dense it is.
True or false |
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A glass of tea with ice cubes in it is an example of a heterogeneous mixture.
True or false |
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One calorie is the amount of heat energy required to raise the temperature of 10.0g of water by 1 degree C.
True or false |
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If the number of 6.250 is rounded to 2 significant figures, it would be reported as 6.3
True or false |
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The number of protons in the nucleus of an atom is the atomic number of that atom.
True or false |
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In order for an atom of an element to be neutral, its number of electrons must equal its number of protons.
True or false |
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The mass of an isotope is the sum of the number of protons and neutrons in its nucleus.
True or false |
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A cation is a postively charged ion that has fewer electrons than protons.
True or false |
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| Which of the following statements regarding the emphirical formulas, molecular formulas, and percent composition is correct? A) The emphirical formula and molecular formula of a given compound are always the same. B) Two compounds having different percent compositions of the same two elements are not the same compound. C) The emphirical formula and molecular formula of a given compound are never the same. D) Data on the percent composition of the elements in a given compound is insufficient to determine the empirical formula of the compound. E) The compound S2Cl2 would have the same empirical and molecular formulas. |
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Definition
B) Two compounds having different percent compositions of the same two elements are not the same compound.
d) 1.5 x 10^23 |
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| Which of the following statements regarding empirical and molecular formulas is correct? A) Information on percent composition is all that is necessary to determine both an empirical and a molecular formula. B) A compound with an empirical formula of CH2O and a molar mass of 90 g/mol would have a molecular formula of C3H6O3. C) The compound C2H4 and C3H6 have different empirical formulas. D) The formula Ca2Cl4 is the correct empirical formula for calcium chloride. E) The compound benzene has a molecular formula of C6H6, so its empirical formula would be C3H3. |
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Definition
B) A compound with an empirical formula of CH2O and a molar mass of 90 g/mol would have a molecular formula of C3H6O3. |
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A reaction which has two elements are reactants and one compound as a product:
A) a decomposition reaction
B) A combination reaction
C) A single-displacement reaction
D) A double-displacement reaction
E) combustion reaction |
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Definition
B) a combination reaction |
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A reaction which has two compounds as reactants and two compounds as products:
A) decompostion reaction
B) combination reaction
C) single-displacement reaction
D) double-displacement reaction
E) combustion reaction |
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Definition
D) double-displacement reaction |
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| Which of the following processes is exothermic? A) boiling water to make tea B) cooking an egg C) heating food in a microwave oven D) an acid and base reacting toether and causing the solution to become warm E) water in a swimming pool getting warmer in the sun. |
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Definition
D) an acid and base reacting together, and causing the solution to become warm. |
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| Which of the following processes is endothermic? A) burning gasoline in an internal combustion engine B) evaporation of perpiration on your skin C) burning wood in a fireplace D) condensing steam on a mirror E) hot coffee cooling down as it sits on the table. |
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Definition
B) evaporation of perspiration on your skin. |
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True or False:
One mole of methane (CH4) and one mole of oxygen (O2) would have the same number of atoms. |
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Give an example of endothermic reaction |
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Give an example of exothermic reaction. |
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True or False:
ALL waves are characterized by wavelength, amplitude, frequency and speed. |
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True or False:
Electromagnetic radiation does not include visible light from the sun, microwaves, Xrays, and radio waves. |
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True or False:
A wave's frequency is measure in hertz. |
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| Which of the following travel at the speed of light? A) atomic emission spectrum B) principle quantum number C) wavelength D) electromagnetic radiation |
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A) atomic emission spectrum |
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| Which of the following travel at the speed of light? A) microwaves B) radio waves C) xrays D) all of the above. |
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