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🧪 Chemistry

Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

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Q: What is the law of definite proportions
1 answer
Q: How are sediment compositions in a clastic rock determined
1 answer
Q: What has a pH of 9
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Q: What is a the base of neptunium
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Q: What is the molecules or ions has a trigonal planar shape
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Q: What transfers energy from glucose to other molecules during redox reactions in cells
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Q: Is solubity a physical or chemical change
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Q: What is the half-life of a 12 g sample of radioisotope that decayed to 6 g in 28 days
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Q: 64.3 grams of solute in 3.90 X 10Ë grams of water raises the boiling point to 100.680 àC
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Q: Choose the element that is most active
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Q: What are the three subatomic particles of a molecule
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Q: What is ethane used for
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Q: The change that takes place when two or more substances interact to form new substances is called a reaction.
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Q: What is a chemical equation in which both the reactant an product have an equal number of atoms of a given element
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Q: How does cola compare to pure water on a pH scale
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Q: What of the following is best defines evaluation
2 answers
Q: The variable that Boyles law holds constant is
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Q: How many moles of oxygen are required to produce 3.00 moles of water
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Q: Is nh4 organic or iorganic
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Q: What concentration unit is measured in moles of solute per kilogram of solvent
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Q: Is 2 butene is ionic or cavalent
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Q: Calculate the number of moles in 27.50 grams CaCO3
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Q: What are the good and bad effects of physical chemical changes
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Q: What are the advantages of natural fibers over synthetic fibers
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Q: What is the correct way to write a chemical symbol for sodium
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Q: How much energy does a 9 10 8 m wavelength photon have
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Q: Two containers have different solute concentrations After osmosis occurs between the two containers which is true
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Q: What characteristic of a sound wave that you interpret as loudness is related to
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Q: What kind of solution would have a Kb value that is much greater then 1
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Q: Identify the diatomic element in this group
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Q: Is honey soy sauce guacamole a heterogeneous or a homogeneous
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Q: What is the difference between lavoisier-laplace law and hess's law
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Q: Is too much material is removed from a reagent container the excess can be safely returned to the container if it has not touched anything
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Q: Who is recognized as the creator of experimental science whose work was an important resource in the scientific revolution in Europe during the 1500s and 1600s
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Q: How does increasing temperature affect collisions
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Q: What is the pH of a solution with H 2.310-6
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Q: What is an example of a chemical change a candle burns a pan of water boils a teaspoon of salt dissolves a burner gets red hot
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Q: If a sample of gas occupies 20 ml at -132 C what volume does the sample occupy at 50 C
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Q: Is CO polar non polar or ionic
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Q: How much energy is required to raise the temperature of 3 g of silver from 15 C to 20 C
1 answer
Q: The geometry of a water molecule is what
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Q: Which chemical equation is balanced
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Q: Are triglyceride a monomer
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Q: What is the half life of a radioisotope if a 40 g sample becomes 10 g after 20 minutes
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Q: Which part of an element determines its atomic number
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Q: What states that matter is not created or destroyed in a chemical reaction
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Q: A mixture of two gases has a total pressure of 5.7 ATM If one gas has a partial pressure of 4.1 ATM what is the partial pressure of the other gas
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Q: This item is a common source of heat in a laboratory.
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Q: What determines an atom's identity and atomic number
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Q: What could the third quantum number for one of the electrons in the 4p energy sublevel of bromine
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