11. <span>Ionic compounds that dissolve in water conduct electricity because they break into ions that move freely.
12. </span><span>Solid metals are good conductors of heat and electricity.
13. </span>Molecular compounds that dissolve in water do not conduct electricity because no charged particles are present.
14. <span>Because the electrons in a molecule of hydrogen fluoride (HF) are more strongly pulled toward the fluorine atom, the molecule is polar.
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15. A metal crystal consists of positively charged metal ions embedded in a "sea" of freely moving valence electrons.
16. <span>The properties of solid metals can be explained by the structure of and the bonding among the metal atoms. = True
17. </span><span>Orderly crystal shapes, high melting points, and electrical conductivity, when dissolved in water, are properties of ionic compounds. = True
18. </span><span>When electrons are transferred between two atoms, a covalent bond is formed. = False (</span><span>When electrons are shared between two atoms, a covalent bond is formed.)
19. </span><span>A low melting point is one property of molecular compounds. = True
20. </span><span>A nonpolar bond is formed when two atoms share electrons unequally. = False (</span><span>a polar bond is formed)</span>
Answer:
A spinning ball creates a "Centrifugal Force" because you give it the "energy" to spin. A ball that is not moving does not require any external energy to keep it still.
Explanation
Answer:
The correct answer is: Serine, Histidine, Aspartate
Explanation:
The catalytic triad of an enzyme is composed of three aminoacid residues which are the most important for its catalytic activity. They are located in the catalytic site of the enzyme. In the case of chymotrypsin- a serine protease, the catalytic triad is composed by serine, histidine and aspartate (Ser-His-Asp). Serine proteases hydrolyse peptidic bonds in proteins and peptides. To do that, the histidine-which interacts with the aspartate by a hydrogen bond so its pKa increases- take a proton from the serine. Thus, deprotonated serine is able to attack the peptide bond and to perform hydrolysis.
Answer:
Granite
Explanation:
The specific heat capacity of a substance, which is denoted by "c", is the amount of heat required to raise the temperature of a particular mass of that substance by 1°C. It is calculated as follows:
c = Q ÷ m∆T
Where;
c = specific heat capacity
Q = amount of heat (J)
m = mass of substance
∆T = change in temperature.
According to this equation and explanation above, a low specific heat capacity means that the rate at which the temperature is raised is slow and vice versa. Hence, from this question, GRANITE with specific capacity of 0.790 J/gK will raise temperature the slowest.
The overall enthalpy of reaction will be calculated from enthalpy of formation of products and reactants.
DeltaHrxn = [Sum of enthalpy of formation of products] - [sum of enthalpy of formation of reactants]
DeltaHrxn = 3 X deltaHf (H2O) - [ 3 X DeltaH (H2) + DeltaH (O3)]
DeltaHrxn = 3 X (--242) - [ 0 + 143] = -869 kJ / mole
We can also calculate the enthalpy of reaction from bond energies