Master Chemistry with Fun Quizzes & Brain Teasers!

Which statement BEST describes the difference between groups and periods in the periodic table of elements?A) Elements in periods have similar properties, while elements in groups have gradually changing propertiesB) Elements in periods have gradually changing chemical properties, while elements in groups have similar properties.C) Elements in periods are found in vertical columns, while elements in groups are found in horizontal rows.D) Elements in periods are mostly metals, while elements in groups are mostly metalloids.
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A cyclist rode at an average speed of 15 mph for 30 miles. How long was the ride? Solve for time.A) 2 hoursB) 1 hourC) 3 hoursD) 0.5 hours
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What was the hiker's average velocity during JUST Part B of the hike?A) 10 km/hr southeastB) 6 km/hr southC) 0.17 km/hr southD) 0.6 km/hr north
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A bowling ball with a mass of 2.5 kg was thrown and accelerated at a rate of 10 m/s2. How much force was used to throw the ball?A) 25 NB) 7.5 NC) 4 ND) 12.5 N
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how are windbelts formed Please answer ASP its 30 points!!
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a student dissolves 17.48 g of cabr2 in enough water to make 215 ml of solution. what is the concentration of each ion in the solution?
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galena is an example of: a. a sulfate mineral b. a sheet silicate mineral c. an oxide mineral d. a halide mineral e. a sulfide mineral
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how many grams are 2.9 moles of x1y4z6 where x has an atomic mass of 189.5 y has an atomic mass of 197.6 z has an atomic mass of 115.7
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write a net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrofluoric acid are combined.
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an atom of which element would require the most amount of energy remove the most loosely bound electron from an atom in the gas phase?
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iodine 131 has a half life of 8.1 days, polonium 214 has a half life of 1.5 x 10-4 s, if there are the same number of unstable nuclei in samples of both, which will have the larger activity?
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dr. gore found a strong correlation between carbon emissions and increasing ambient temperatures. can we conclude from his results that increasing temperatures is caused by carbon emissions?
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what is the form of energy contained in a dam called? group of answer choices nuclear chemical kinetic potential
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what is the molar concentration of na ions in 0.0200 m solutions of the following sodium salts in water?
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c-14 (radiocarbon) is radioactive and decays into n-14 with a half-life of 5730 years. you have measured the number of atoms of c-14 in a piece of charcoal from an archeological site and find 125 atoms. assuming the charcoal started with 1000 atoms of c-14, how old is the charcoal?
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bonding in metallic solids-metallic solids have metal atoms in face-centered or body-centered arrangements-coordination number for each atom is either 8 or 12-problem: the bonding is too strong for London Dispersion forces and there are not enough electrons for covalent bonds-resolution: the metal nuclei float in a sea of electrons-metals conduct because the electrons are delocalized and are mobile
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Determine whether each of the examples represents a colligative property or non colligative property1. freezing point depression2. density3. boiling point elevation4. vapor pressure lowering5. coloura. colligativeb. non colligativec. colligatived. colligativee. non colligative
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Describe two ways to add heat to liquid water.
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Your friend asks you where their horse went. You say that it ran toward the forest. What is the reference point?A) your friendB) youC) the forestD) the horse
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If 7 grams 7 liters solution of Lithium hydroxide is mix with 500 mL of hydrofluoric acid, how much of the acids and each products will be formed? Find the pH of the acid and pOH of the base.
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using wind turbines to produce electricity avoids the production of nitrogen oxides and sulfur dioxide, which are the major pollutants
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what is the empirical formula of stannous fluoride, the first fluoride compound added to toothpaste to protect teeth against decay? its mass percent composition is 24.25% ff , 75.75% snsn .
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draw the basic structure of an amino acid. how does the structure of an amino acid contribute to its function? use the terms r group, folding, peptide bond, polarity, ribosome, and carbon.
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a certain acetic acid solution has . calculate the volume of 0.0838 m required to reach the equivalence point in the titration of 20.0 ml of the acetic acid solution.
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