Master Chemistry with Fun Quizzes & Brain Teasers!

Which question cannot be answered through making measurements?A. How much has the honeybee population declined in NorthAmerica?B. How does a decline in honeybees affect the pollination of crops?C. Should humans stop using chemicals that harm honeybees?D. Which chemicals produced by humans cause harm to honeybees?
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identify the following substance
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select the correct answer
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select the correct answer
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11.select the correct description for the atoms below
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to find the mass number you add the protons + the electrons true or false
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what did we discover with the following experiment
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Which of the following choices is a goal of science?
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What color is a mirror?
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why is helium heavier than hydrogen
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select the correct answer
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uranium in the isotope below had 140 nutrons
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Based on the Law of Conservation of Matter, why do you think the weight of Steel Wool would change the way it did?
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solid liquid gas or plasma
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The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.Kepler's StatementsThe orbit of a planet around the sun is an ellipse.As a planet orbits the sun, a line between the planet and the sun sweeps out equal areas during equal periods of time.There is a mathematical relationship between the time it takes a planet to orbit the sun and the average distance theplanet is from the sun.Over the last four hundred years, predictions based on his statements have proven true. Which best describesKepler's statements?O hypothesisO theorylawexplanation
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A certain chemical compound has a molar mass of 106.05 g/mol. Calculate the mass in grams of 2.58 moles of this compound.
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How many atoms of Titanium are in 3 moles?
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How many atoms of lead are in 3.5 moles of lead?
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How does warm water at the surface of the oceanbecome colder?
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_________energy from the sun
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Which one is the correct representation in scientific notation for 0.0000535)
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If a 91.3 g piece of aluminum has a density of 2.7 g/cm3, what is its volume in cubic centimeters?
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The density of rubbing alcohol is 0.785g/mL at 25. Calculate the mass of 15.0 mL of the rubbing alcohol. Calculate the volume of 15.0 g of the rubbing alcohol.
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2. A rock occupies a volume of 20 cm and has a mass of 54 grams. Find the density ofthis rock.
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