Master Chemistry with Fun Quizzes & Brain Teasers!

Determine the number of neutrons, protons, and electrons for a bromide ion that has a mass number of 76, and a charge of-1.
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The most common form of elemental sulfur is S8, in which eight sulfur atoms linked in a ring of single bonds. At high temperature, in the gas phase, S8 can break apart to give S2, the sulfur analog of molecular oxygen: S8(g) 4S2(g) H = +239 kJ at T = 800 K Using the appropriate data in Table 3-2 S-S 240 calculate the S=S double-bond energy (in kJ/mol) in S2(g).
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Of all boron atoms, 19.9%% are boron-10, which have a mass of 10.01294 amu. The other 80.1% of boron atoms are boron-11 and these have a mass of 11.00931. Calculate the average atomic mass of boron.
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The Density of this log is 1.75g/cm3. If we cut this log in half, what is the density of the log? Make sure to show your work and explain your answer.
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Which type of rock typically has the largest formed crystals?A) metamorphic B) sedimentary C) extrusive igneous (Its not C)D) intrusive igneous
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Which has the lowest density? *WoodIronWatergold
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which has the least amount of decimal places? 0.062 or 16.32?
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Which would be an example of a compound?oxygencarbon dioxidesandcarbon
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Chemical engineers who specialize in negotiating for large purchases and instructing customers in use of the products are:corporate managerslegal servicesproduct developersmarketing personnel
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The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initial volume of 49.170.04 mL was delivered, the buret was refilled, and an additional 1.560.04 mL was delivered before the endpoint was reached. The titration of a blank solution without the analyte required 0.600.04 mL . Calculate the endpoint volume corrected for the blank and its absolute uncertainty. Note: Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. volume: mL mL
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L is the midpoint of VCLV = 9 find VC
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What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87 m?O 0.023 m/sO 43.5 m/sO 89 m/sO 174 m/sHURY PLEASE
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Answer fast! All transition metals have _______ valence electrons.
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What is an element?
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Which properties change the composition of a substance?A. chemical propertiesB. chemical and physical propertiesC. physical propertiesD. neither chemical nor physical properties
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Which is the best step for Peta to take next? During a science lab, Peta poured two clear chemicals into different beakers. Afterward, he realized that he did not label the beakers so he could not tell the chemicals apart. smell them in order to identify them O taste them in order to identify them O mix them together and pour them down the drain O ask the teacher to dispose of them and start over
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Identify whether longhand notation or noble-gas notation was used in each case below. Potassium (K): 1s22s22p63s23p64s1 longhand notation noble-gas notation
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The largest source of power generated in the US isA) fossil fuel combustion.B) nuclear.C) solar.D) wind.
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What elegant has 2 valence electrons
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Marco is conducting an experiment. He knows the wave that he is working with has a wavelength of 32.4 cm. If hemeasures the frequency as 3 hertz, which statement about the wave is accurate?O The wave has traveled 32.4 cm in 3 seconds.The wave has traveled 32.4 cm in 9 seconds.O The wave has traveled 97.2 cm in 3 seconds.O The wave has traveled 97.2 cm in 1 second.
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(a) Which of the following atoms is smallest: vanadium, chromium or tungsten? (b) Which of these atoms has the highest ionization energy? (c) Which is the most electronegative?
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How are heterogeneous and homogeneous mixtures separated?
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An element has 2 common isotopes. The first isotope has a mass of 68.926 amu and occurs 60.10% of the time. The second isotope has a mass of 70.925 amu and occurs 39.90 % of the time. Calculate the atomic mass of this element.
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Which arrow represents the change of state describedabove?The diagram shows changes of state between solid,liquid, and gas. The atoms of a substance lose energyduring a change of state. Before the change, the atomsare close together but are able to slide past one another.gasa. Mb. Nc. Pd. Q
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