INTRO TO CHEMISTRY Get started!

Which of the following is NOT matter? SMOKE AIR LIGHT SAND

Light is a form of energy and energy is NOT matter! VERY GOOD!! LIGHT Light is a form of energy and energy is NOT matter! Back to the question Next Question

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Which of the following is NOT one of the three physical states of matter? Solid Liquid Gas Aqueous

Solid, liquid, and gas are the three physical states of matter Very good! Aqueous Solid, liquid, and gas are the three physical states of matter Next Question Back to the question

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Which of the following best describes carbon monoxide (CO)? Element Compound Homogeneous mixture Heterogeneous mixture

Very Good! Compound Carbon monoxide (CO) is a compound. It is made up of two or more elements CHEMICALLY combined. Next Question Back to the question

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Salt water is an example of a… Element Compound Homogeneous mixture Heterogeneous mixture

Very good! Homogeneous mixture Salt water is an example of a homogeneous mixture. The mixture looks uniform throughout. However, it is a mixture because both the salt and the water maintain their original properties and can be physically separated. Next Question Back to the question

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Which of the following CANNOT be broken down into a simpler substance? Oil and water Juice Carbon (C) Sodium chloride (NaCl)

Very Good! Carbon (C) Carbon is an element. Elements cannot be broken into simpler substances. Sodium chloride is a compound, oil and water is a heterogeneous mixture, and juice is a homogeneous mixture. All three of these can be broken into simpler substances. Next Question Back to the question

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The following are observations of what happens when two solutions are mixed. Which is NOT evidence that a chemical reaction has occurred? There is fizzing and bubbling The test tube feels hotter One of the solutions was yellow to start A solid forms

One of the solutions was yellow to start Very Good! One of the solutions was yellow to start Production of a gas (seen by the fizzing and bubbling), energy released (the test tube felt hotter), and the formation of a solid are all evidence that a chemical reaction has occurred. Next Question Back to the question

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Which of the following is an example of a chemical change? Breaking a pencil in half Salt dissolving in water The corrosion of metal Grinding garlic

Remember in a chemical change…something NEW is produced Very good! The corrosion of metal Remember in a chemical change…something NEW is produced Next Question Back to the question

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Phase changes are an example of a… Chemical property Physical change Chemical change Extensive property

Very good! Physical change A phase change is only a change in state of mater so it is a physical change. Next Question Back to the question

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What would be the correct symbol for when solid salt (NaCl) is melted? NaCl (s) NaCl (l) NaCl (g) NaCl (aq)

Very good! NaCl (l) When salt is melted it becomes a liquid. Remember that a liquid is different than an aqueous solution. An aqueous solution is made when a solid is dissolved in water. Next Question Back to the question

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Mercury is a silver colored liquid Mercury is a silver colored liquid. The silver color of mercury is an example of a …. Intensive physical property Chemical property Extensive physical property Physical change

Intensive physical property Very good! Intensive physical property Intensive properties to not depend on the amount of a substance. Extensive properties DO depend on the amount of a substance…like mass or length Next Question Back to the question

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A and B produce solid products What is true about the following reaction: A (s) + B (aq)  C (g) + D (aq) C and D are reactants D is a solid A and B produce solid products A and B are reactants

A chemical reaction has this general form: Reactants  Products Very good! A and B are reactants A chemical reaction has this general form: Reactants  Products Next Question Back to the question

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SCIENTIFIC NOTATION & SIG FIGS Get started!

How do you write 0.00560 in scientific notation? 5.60 x 10-3 0.560 x 10-2 56.0 x 10-4 0.560 x 102 5.60 x 103

Very good! 5.60 x 10-3 Remember that when writing a number in scientific notation, there should be ONE number to the LEFT of the decimal. Since the number is less than 1, the exponent should be negative. Next Question Back to the question

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3.6 x 105 could be also written as… 0.00036 3600000 0.000036 0.360000 360000

Very good! 360000 Since the exponent is positive, your decimal should be moving to the right. Next Question Back to the question

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How many sig figs are in the 0.0003005600? 4 11 10 3 7

Very good! 7 Remember that zeros in front of a number are placeholder zeros and are NOT significant. Terminating zeros to the right of the decimal are significant. Any zero in between significant numbers is significant Next Question Back to the question

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How many sig figs are in the 70800000? 3 4 2

Very good! 3 Remember that zeros after a number but before the decimal are placeholder zeros and are NOT significant. Any zero in between significant numbers is significant Next question Back to the question

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What is the correct answer to the following problem: 7.815 + 2.07 = 9.885 9.89 9.88 9.9

Very good! 9.89 7.815 + 2.07 = 9.885 When adding or subtracting two numbers, your answer should have the same number of decimal places as the measurement with the least number of decimal places. 2.07 has two decimal places so your answer should be rounded to 9.89 Next Question Back to the question

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CLOSE! But not quite correct…don’t forget about rounding! Try again…

What is the correct answer to the following problem: 8.670 x 0.54 = 4.682 4.7 4.6818 4.68

Very good! 4.7 8.670 x 0.54 = 4.6818 When you multiply or divide two numbers your answer should have the same number of total sig figs as the answer with the fewest sig figs. 0.54 has two sig figs so your answer should be rounded to 4.7 Done! Back to the question

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Great Job! Good luck on your quiz! I’m in chemistry I’m in honors chemistry Back to the start

Chemistry Don’t forget to also study how to record a measurement with the correct number of significant figures Finish the quiz review given in class for homework due Monday. Back to the start

Honors Chemistry Half of your quiz will be on the information in the presentation, the other half will be on dimensional analysis Don’t forget that the three dimensional analysis worksheets are due on Monday Back to the start