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An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium? 0 24 28 52
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When hydrogen peroxide bubbles, it is undergoing a chemical change. Which statement best describes what is happening? The atoms in hydrogen peroxide are breaking apart and forming new types of molecules. The atoms in hyd...
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What is conserved in physical changes? shape energy mass density
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These models show the electron structures of two different nonmetal elements. Element 1 at left has a purple circle at center with 2 concentric black lines around it. The first line has 2 small green balls on it. The sec...
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Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below. Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolve...
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Which object would sink in honey, which has a density of 1.4 g/cm³? Object 1 (0.9 g/cm³) Object 2 (1.2g /cm³) Object 3 (0.2 g/cm³) Object 4 (2.3 g/cm³)
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Atoms of two different elements must have different electrical charges. numbers of neutrons. atomic numbers. energy levels.
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Johnny rode his bike StartFraction 4 over 7 EndFraction of a mile from his house to the lake on a straight path. Then, he turned around and rode his bike 3 and StartFraction 1 over 8 EndFraction miles in the opposite dir...
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Jace estimated the product of (34.57)(–0.74) by rounding each number to the nearest tenth. What was Jace’s estimate? –25.6 –24.22 24.22 25.6
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Holly earns $30 for babysitting 5 hours. She earns $28 when she does chores for 4 hours. Which compares the unit rates? The unit rate for babysitting is $2 per hour more than the unit rate for doing chores. The unit rate...
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Using the order of operations, what should be done first to evaluate 6 + StartFraction (negative 5 minus 7) over 2 EndFraction minus 8 (3)? Subtract 7 from –5. Multiply 8 and 3. Divide 7 by 2. Add 6 and –5.
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What is the product of Negative StartFraction 2 over 7 EndFraction and Negative StartFraction 3 over 7 EndFraction? Negative StartFraction 6 over 7 EndFraction Negative StartFraction 6 over 49 EndFraction StartFraction 6...
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Which set includes rational numbers but not natural numbers? Negative 6 and two-thirds, negative 2, StartFraction 5 Over 11 EndFraction, StartFraction 7 Over 8 EndFraction Negative 5, negative 4, 4, 5 Three-fourths, 4 an...
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Which set includes rational numbers but not natural numbers? Negative 6 and two-thirds, negative 2, StartFraction 5 Over 11 EndFraction, StartFraction 7 Over 8 EndFraction Negative 5, negative 4, 4, 5 Three-fourths, 4 an...
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Daniel’s spinner is divided into 8 equal sections. A spinner divided into 8 equal sections labeled gray, green, red, purple, gray, green, yellow, blue. He plans to spin it 80 times. Which equation predicts the number of...
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The cooler at a picnic contained 4 apple juice boxes, 8 orange juice boxes, and 6 fruit punch juice boxes. A juice box is selected at random. What is the probability of the complement of choosing an orange juice box? Sta...
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Nico and Albert are finishing up a science project. They measured the length in inches of three insects. They also found the average measurement of two more insects from a website. Bug Length Bug Length in inches Lady bu...
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Which expression is equivalent to –21.8 – (–18.3)? –21.8 + 18.3 –21.8 – 18.3 21.8 + 18.3 21.8 – 18.3
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How do the expressions 72 divided by 9 and Negative 72 divided by (negative 9) compare when they are evaluated? They have different values and are different signs. They have different values but are the same sign. They h...
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Bruno uses a piece of wrapping paper with dimensions 1 and one-fourth feet by 3 feet to wrap a gift. What is the total area of the paper used to wrap the gift? One-fourth square feet Three-fourths square feet 3 and one-f...
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In which of these cases is each stamp worth the most? 7 of the same stamp worth a total of $3.15 8 of the same stamp worth a total of $3.20 10 of the same stamp worth a total of $4.10 16 of the same stamp worth a total o...
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Water flowed out of a tank at a steady rate. A total of 18 and one-half gallons flowed out of the tank in 4 and one-fourth hours. Which expression determines the quantity of water leaving the tank per hour? StartFraction...
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Which estimation technique will yield a solution that is farthest from the actual product of (–14.89)(1.35)? front-end estimation rounding to the nearest tenth rounding to the nearest whole number compatible numbers
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At 4 p.m., the temperature started to change drastically. Each hour, for three hours, the temperature decreased by 7°F. Which word in the problem indicates that a negative integer should be used? change each decreased dr...
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The Nash family spent a total of $240 on a hotel room for 3 nights. Which equation can be used to find c, the average cost per night for the hotel room? c times 240 = 3 c divided by 240 = 3 240 times 3 = c 240 divided by...
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