Questions in Chemistry

Why do elements in the same group of the periodic table have similar properties?

Complete the sentence. The higher the hydrogen ion concentration, the ______ the pH. higher lower closer to 7 closer to 14

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 …

Which factor can decrease the rate of a chemical reaction? low activation energy high pressure low temperature high concentration of reactants

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 …

What are the top ten most abundant elements in the human body

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. …

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 …

The overall equation for the cellular respiration of glucose is C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy. C5H12O6 + 6 O2 → 5 CO2 + …

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 …

What is the oxidation state of each element in COH2?

What is the number of valence electrons in cadmium (Cd)? 1 2 10 12

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

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 …

Does it have any difference between atomic mass and mass number​

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 …

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. …

What is the oxidation state of each element in k2cr2o7?

Which substance cannot be broken down by a chemical change?(1) ammonia (2) mercury (3) propane (4) water

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