Questions in Chemistry


why do elements in the same group have similar properties

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Why do elements in the same group of the periodic table have similar properties?
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the lower the ph the higher the hydrogen ion concentration

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Complete the sentence. The higher the hydrogen ion concentration, the ______ the pH. higher lower closer to 7 closer to 14
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how is a covalent bond different from an ionic bond

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How do an ionic bond and a covalent bond differ? A. there is no difference. both an ionic bond and covalent bond share electrons B. there is no difference. both …
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which factor can decrease the rate of a chemical reaction

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Which factor can decrease the rate of a chemical reaction? low activation energy high pressure low temperature high concentration of reactants
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what did ernest rutherford's gold foil experiment demonstrate about atoms

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01 What did Ernest Rutherford's gold foil experiment demonstrate about an atom? Each atom is composed of electrons and positive material, The mass of the atom is evenly spread throughout …
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what is the most abundant element in the human body

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What are the top ten most abundant elements in the human body
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which of the following is not an oxidation reduction reaction

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Which of the following is not an oxidation-reduction reaction? A. XeF6(s) → XeF4(s) + F2(g) B. 2Cs(s) + L2(g) → 2Csl(s) C. 2H2SO4(aq) + 2Ba(oh)2(aq) → 2BaSO4(s) + 4H2O(I) D. …
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how to tell if a compound is ionic or molecular

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Describe the difference between ionic and molecular compounds. Give an example of each. Check all that apply. Check all that apply. A molecular compound is formed between a metal and …
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the overall equation for the cellular respiration of glucose is

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The overall equation for the cellular respiration of glucose is C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy. C5H12O6 + 6 O2 → 5 CO2 + …
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what is the basic difference between exergonic and endergonic reactions

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What is the difference between an exergonic reaction and an endergonic reaction? A.) An exergonic reaction results in a decrease in mass, and an endergonic reaction results in an increase …
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what is the oxidation state of each element in coh2

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What is the oxidation state of each element in COH2?
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what is the number of valence electrons in cadmium cd

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What is the number of valence electrons in cadmium (Cd)? 1 2 10 12
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which of the following compounds is most soluble in water

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Which of the following compounds is the most soluble in water? Hint: Look for functional groups that will form H-bonds with water. CH3CH2CH2CH2CH3 OHCH3CH2OCH2CH2CH3 CH3CH2CH2CH2CH2OH OHCH2CH2CH2CH2CH2OH
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what is the relationship between a mole and avogadro's number

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What is the relationship between a mole and Avogadro’s number? A mole is the mass of Avogadro’s number of particles of a substance. A mole is the amount of a …
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what is the difference between atomic mass and mass number

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Does it have any difference between atomic mass and mass number​
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how to tell if a molecule is polar or nonpolar

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Complete the following table. Tell if the molecule is polar or nonpolar, draw the Lewis dot structure for the molecule, tell what shape the molecule is, and state what the …
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which of these relationships is true of an uncharged atom

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Which of these relationships is true of an uncharged atom? which of these relationships is true of an uncharged atom? the atomic mass is equal to the number of electrons. …
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what is the oxidation state of each element in k2cr2o7

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What is the oxidation state of each element in k2cr2o7?
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which substance cannot be broken down by a chemical change

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Which substance cannot be broken down by a chemical change?(1) ammonia (2) mercury (3) propane (4) water
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the energy required to remove an electron from an atom

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What is the energy required to remove an electron from an atom in the gaseous state called
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