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Chemistry
Page 58
Questions (96,914)
Use the chemical equation to answer the question.
2O2 + CH4 → ?H2O + CO2 How many molecules of water are produced in the
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What is the volume percent in ethanol obtained by the fermentation of sugar by yeast, if a 50-mL aliquot of the fermented liquid
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what is the hydroxide ion concentration in a solution with the pH of 9.5 at 25°C
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2.2 M solution of hydrocyanic acid, HCN, at 25°C. pKa=9.21 at 25°C. Find the concentrations of all species present in the
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Crude oil is removed from the Earth through blank. It is then blank into the different components by heating and boiling. After
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11 P
12 N Use the pictures below to help you answer the following question: Which statement below is NOT true about this atom?
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Michael has recorded his observations while mixing vinegar and baking soda in a beaker.
image ab17ec12a8814e03b67c07f3da5f7ab8
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Elizabeth was studying physical and chemical properties and created the table below to help her. Which property and example does
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If the amount of carbon dioxide in a workplace is greater than 1000 Per million (ppm) it can cause drowsiness and complaints of
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Which statement is true regarding a chemical reaction?(1 point)
Responses The total number of atoms changes, so mass is conserved
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A mixture contains 5.00 g each of O2, N2, CO2, and Ne gas. Calculate the volume of this mixture at STP
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A 250.0 mL flask of hydrogen gas is collected at 763 mm Hg and 35.0 Celsius by displacement of water from the flask. The vapor
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Use the equation and the table to answer the question.
FeCl3 + 3H2O → Fe(OH)3 + 3HCl Element Mass of an Atom (amu) Fe 56 Cl 35
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Water is often called the “universal solvent” because it can dissolve many different kinds of substances. What kinds of
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o
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How many of each subatomic particle does a stable Sodium (Na) atom have? (1 point)Responses11 protons, 11 neutrons, and 12
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Na3PO4
Which one of the following ionic compounds is insoluble in water? NaCl MgCl2 CaCO3 AgNO3
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What is the mass percent of hydrogen in hydrogen peroxide, H2O2?
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What mass of aluminum would be in a 65.82 g sample of aluminum oxide?
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Who put together the Periodic table answer in short
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Lwazi
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What are the three grouping of elements in the periodic table answer and short sentences
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Lwazi
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What happens when carbon dioxide from the atmosphere dissolves in seawater?(1 point)
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What did you learn about elements in the periodic table?
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What does number 7 in nitrogen represent answer in short sentences
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Aluthando
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Pure water and pure salt are poor conductors of electricity. When salt is dissolved in water, the resulting solution conducts
1 answer
asked by
uythc
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When carbon dioxide is in ocean water it bonds to carbonate, preventing its use by(1 point)
Responses whales and shellfish. coral
3 answers
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queen
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How is fusion different from a simple chemical reaction?(1 point)
Responses The atoms are bound to each other by electrons in a
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An alpha particle is equivalent to the nucleus of an atom of which element?(1 point)
Responses nitrogen nitrogen helium helium
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Use the equation to complete the activity.
21986 Rn + Beta→21985 As The nuclear equation shows a form of radon into astatine
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Nuclear reactions can be written out in equation form with information about the nuclei that take place in the fusion reaction
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How is fission different from a simple chemical reaction?(1 point)
Responses Protons cause fission reactions, while chemical
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Which is true of an element?(1 point)
Responses has a unique number of protons; if the element were to lose a proton, it would
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i dont like boys
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Which of the following chemicals are pollutants released when people burn fossil fuels? Select the two correct answers.(1 point)
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What is a melting point answer in short sentence
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Aluthando
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What is a boiling point
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Aluthando
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Discuss properties of metals answer in short sentence
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Aluthando
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How many significant figures does 0.0624000
have?
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Which statement is true about the two metals used in batteries?(1 point)
Responses The two metals are not reactive to chemicals
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Uncle moe last name lester
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Benzene is a carcinogenic (cancer-causing) compound. A benzene-contaminated water sample contains 5.5×10−5 %
benzene by mass.
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Lina
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Which best describes a covalent bond?(1 point)
Responses Multiple atoms bond together, whether they are the same element or not.
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i dont like boys
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What will make an atom without an electrical charge? (1 point)
Responses An equal number of protons and electrons, because
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i dont like boys
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In 3–5 sentences, describe what happens during a chemical reaction, using the terms reactant, product, and bond. (4 points)
and
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i dont like boys
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What types of atoms have the same number of electrons and protons?
* 1 point all atoms stable atoms ions metalloids
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How is fission different from a simple chemical reaction?(1 point)
Responses Fission reactions run out of control, while chemical
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the
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Ionic bonds bond ions together(1 point)
through their electric attraction to each other due to their equal electrical charges.
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Ionic bonds bond ions together(1 point)
Responses through their electric attraction to each other due to their opposite
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Anoumous
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"Green" material has high amounts of (1 point)
• carbon. O nitrogen. • phosphorus. • magnesium.
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Describe solution stoichiometry
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Mirriam Mwanza
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What is the amount (in g) of acetic acid (CH3COOH) needed to make a 1.00 kg, 7.00 % (by mass) CH3COOH solution?
a. 70 g b. 100 g
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In nuclear chemistry the change that occurs will result in a different atom because * 2 points
A.Electrons are created and added
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Transmutation is known as * 2 points Changing one proton into the element of another proton Changing one element into another or
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