Which of the following is not a metal?
A) Ca
B) Se
C) Zn
D) Mn
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Related Questions
PLEASE HELP CHEM BABES I HAVE BEEN CRYING FOR A WHILE NOW 1. Calculate the mass of nitrogen dioxide (NO2) present in a 0.831 L container if the pressure is 100 kPa at a temperature of 27 oC. R = 8.31 kPa x L / mol x K. (K = oC + 273). 2. A 33.2 L tank contains 280 g of compressed helium. If the pressure inside the tank is 700.0 kPa, what is the temperature of the compressed gas? You must convert the mass of helium into moles using the molar mass of He. The conversion factor will be 1 mol / molar mass of helium. R = 8.31 kPa x L / mol x K
How much does 9.8 liters of ammonia (NH3) weigh at standard temperature and pressure (273 K and 100 kPa)?
Which set of procedures and observations indicates a chemical change?(1) Ethanol is added to an empty beaker and the ethanol eventually disappears. (2) A solid is gently heated in a crucible and the solid slowly turns to liquid. (3) Large crystals are crushed with a mortar and pestle and become powder. (4) A cool, shiny metal is added to water in a beaker and rapid bubbling occurs.
Stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into space
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The given substance combusts following the reaction:
C2H2 + (5/2)O2 -> 2CO2 + H2O
Assume C2H2 is an ideal gas. At STP, 1 mol of an ideal gas occupies 22.4 L. Given 100.50 mL of C2H2, this means that there is 4.4866 x 10^(-3) mol. Combusting 1 mol of C2H2 consumes (5/2) mol of O2, then combusting the given amount of C2H2 consumes 0.01121 mol of O2. At STP, this amount of O2 occupies 251.25 mL.
Answer: 251.25 ml
Explanation:
According to Avogadro's law, 1 mole of every gas occupies 22.4 L at Standard temperature and pressure (STP).
2 moles of occupy =
5 moles of occupy =
Thus 44800 ml of reacts with 112000 ml of
at STP
100.50 ml of reacts with =
of
at STP.
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Missing question: A) LiH B) H₂O C) H₂S D) H₂.
1) In lithium hydride (LiH), lithium has oxidation number +1, than hydrogen must have oxidation number -1, because compound has neutral charge.
2) In water molecule (H₂O), oxygen has oxidation number -2 and hydrogen has +1: 2x + (-2) = 0; x = +1.
3) In hydrogen sulfide (H₂S), sulfur has oxidation number -2 and hydrogen has +1: 2x + (-2) = 0; x = +1.
4) In molecule of hydrogen there is nonpolar covalent bond.
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The statement that is given above “When a system performs work on the surroundings, the work is reported with a negative sign” is true. When the surrounding performs work by the system, it is positive.
(2) metallic crystals
(3) nonpolar molecules
(4) polar molecules
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At standard pressure, a certain compound has a low boiling point and is insoluble in water. At STP, this compound most likely exists as nonpolar molecules. Hence, option C is correct.
What are nonpolar molecules?
A molecule in which the individual dipoles cancel each other & result in zero net dipole moment is called a non-polar molecule.
Nonpolar molecules make weak attractions between molecules called van der Waals forces and they are loosely bound with each other.
Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds and having a boiling point low.
Hence, option C is correct.
Learn more about the nonpolar molecules here:
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Answer is (3) - nonpolar molecules.
Nonpolar molecules make weak attractions between molecules called van der Waals forces. Hence, they are looesly bound with each other. Therefore, nonpolar molecules can easily go to the atmosphere by breaking those weak bonds. Hence, the boiling point is low.
Since water is a polar solvent, nonpolar molecules do not soluble in water.
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Likes repel to one another (positive and positive), (negative and negative)