Chemistry

As atoms vibrate faster, the space between them decreases. True or false?
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A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm. Under conditions of constant temperatureand moles of gas, what is the pressure of the gas when the volume of the vessel is tripled?
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When thinking about genetic engineering in agriculture, which type of issue has the most direct consequences? economical issues political issues social issues environmental issues
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Why can't percent yield be greater than one hundred percent?
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Dentists use a soft, clay-like material to make a filling for a cavity. The filling stays soft under the light of the dentists lamp, but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling when light from the lamp does not?
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What part of the periodic table does the neutrons tell us about the element?
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When was Gorge Washington born? first one to answer will get a brainliest!
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HELPPPPPPP :> WHY DO I NEED 20 WORDS
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A chemist wants to extract the gold from 54.9 g of AuCl3*2H20 *gold(III) chloride dyhydrate) by electrolysis of an aqueous solution. What mass of gold could be obtained from this sample? Answer in units of g
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how many moles of water in 100 grams
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A student pours ammonium nitrate into a container of room temperature water. The student stirs the mixture with a stirring rod and then feels the outside of the container, which is cold to the touch. Which material is part of the system that absorbed heat?the waterthe airthe stirring rodthe container
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what is combined to get calcium chloride
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3) The nucleus in a photograph of a cell measures 3 mm across. If the magnification in the photograph is x 500, what is the actual size of the nucleus?
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Na2SO3" represents sodium sulfite. What does the 4 mean in the formula 4Na2SO3? There are four atoms of sodium. There are four atoms of sodium sulfite. There are four molecules of sodium sulfite. There are four elements in sodium sulfite. 7The World on Turtle's Back" is a creation myth because it focuses on characters whom the Iroquois considered "gods. " is an Iroquoian story about people and animals who talk to each other. Explains how the Iroquois believe that the earth was created. Describes Iroquoian social and cultural values.
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Why does liquid move like it does when heated on the right side?
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Please choose and answer 3 of the following 4 questions:1. Rutherford and JJ Thompson both contributed to what we know about the structure of the atom. What experiments did they perform and how did it change what we know about the structure of theatom? Furthermore, describe the structure of an atom using only words (no diagrams).2. Electrons exist outside the nucleus on many different energy levels. When electrons lose energy, they emit waves that are found on the electromagnetic spectrum. What equation would you use tofind the wavelength or frequency of a wave, assuming you know the other value? What is the relationship between frequency and wavelength? What is the relationship between frequency andenergy?3. Even though electrons move around constantly, scientists use electron configurations to give an "address" to a particular electron. What are the 4 shells that scientists use? How many electrons canfit into each shell? How can you use the knowledge about these shells and the periodic table to determine the electron configuration of an element?4. Suppose you know there is an element with an atomic number of 26 and a mass of 60. What do you know about this element? How many subatomic particles does it have? How can you tell?
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13) Which of the following is NOT a true statement concerning what happens in all chemicalreactionsA) The ways in which atoms are joined together are changedB) New atoms are formed as products,C) The starting materials are named reactants.D) The bonds of the reactants are broken and new bonds of the products are formed,E) in a word equation representing a chemical reaction, the reactants are written on the leftand the products on the rightBARI
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When 25.0 g of NaCl is added to 175 g of water, the mass percent (m/m) NaCl is ________. 7.00% 8.00% 12.5% 25.6% 14.3%
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A scientist was in the field when he saw a mineral sample. He wanted to determine the relative hardness of the mineral, so he conducted scratch tests. He summarized his results in a table. A 2 column table with 4 rows. The first column is labeled Mineral with known hardness with entries: Chalcopyrite, pyrite, Orthoclase, Quartz. Second column is labeled Was a scratch produced? with entries: Yes, Yes, Yes, No. What conclusion can you make about the hardness of the mineral?.
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PLEASE I WILL GIVE BRAINLISET PLS HELPPPP
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an atom of which of the following elements can form the most bonds? a. phosphorus b. sodium c. oxygen d.oxygen
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how many molecules are in 122 grams of Cu(NO3)2
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This is due tomorrow please help!
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In Natural selection, who/what makes the decision about which traits are desirable and get passed to future generations? please need help asap thank you.
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