For Gay-Lussac's law, temperature is measured in _____.
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The elements in the middle of the periodic table are known as:a. Noble elementsc. Transition elementsb. Heavy metalsd. Covalent elements
4. How many moles are in 54.0 grams of Silver?54.0 g Ag x (108mol ag /1 g ag ) = 5,832 ag moles Ag(Use the gray boxes to insert the values for the conversion factors.)5. What is the mass of 6.3 moles of Sulfur?6.3 mol S x ( / ) = g S6. How many atoms are in 6.0 moles of Argon?6.0 mol Ar x ( / ) = atoms of Ar7. How many moles of Kr are in 112 g of Krypton?112 g Kr x ( / ) = moles of Kr8. How many moles are in 1.93 x1024 formula units of KF, potassium fluoride?1.93 x1024 formula units x ( / ) = mol KF(The next two problems need 2 step conversions - so there are two conversion factors (fractions) for the problem - remember the mole map - covert to moles first, then to the desired unit.)9. How many atoms are in 86.2 g of Si (silicon)?86.2 g Si x ( / ) x ( / ) = atoms of silicon10. What is the mass in grams of 4.8 x 1024 atoms of Magnesium?4.8 x 1024 atoms of Mg x ( / ) x ( / ) = g Mg
After reading a book about parrots, Tani wants to learn more about them. Which question could be answered through scientific investigation?A. Which bird’s eggs taste the best? B. What substances make up an eggshell? C. Which birds have the most beautiful feathers? D. Which type of bird makes the best pet in an apartment?
How many moles of carbon dioxide is produced when 10.4 mol of propane gas is burned in excess oxygen?a. 0.288 mol b. 3.46 molc. 31.2 mold. 52.0 mol just the letter
B. metalloid
C. nonmetal
D. noble gas
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Starting from K- Potassium up to As-Arsenic are all metals, the three elements are special: Se-Selenium(Non-Metals),Br-Bromine(Halogens),Kr-Noble gas still part of the row but not classified as metal.
b. Which of the following statements is true?
A) The average kinetic energy of the ice in cup A is less than that in cup
b.
B)The average kinetic energy of the ice in cup A is greater than that cup in
b.
C)The average kinetic energy of the ice cup A is equal to that in cup
b.
D)The average kinetic energies of the ice in cup A and the ice in cup B are not comparable.
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Average kinetic energy is given by the formula:
KE(average) = 3/2*k*T
where k = Boltzmann constant = 1.38*10⁻²³ J/K
T = temperature in Kelvin (K)
Thus, the average KE is dependent only on temperature and independent of mass.
Since the temp in Cup A and B remains the same, the average KE will also be the same.
Ans C)
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Answer : The correct option is,
Explanation :
(1)
(2)
(3)
The reactions 1, 2, and 3 are the example of double-displacement reaction in which the cation and anion of the two reactants exchange their places to give two new compounds.
(4)
This reaction is an example of oxidation-reduction reaction.
Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases.
Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases.
In this reaction the oxidation state of nitrogen and hydrogen is (0) and the oxidation state of nitrogen and hydrogen in are, (-3) and (+1). So, from this we conclude that the nitrogen shows reduction reaction and hydrogen shows oxidation reaction.
Hence, the correct option is,
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Solubility would be the answer since all of the rest are changing the substance. They all deal with bonds except solubility.
Answer: D. Solubility
b. Carbon, atomic number 6
c. Neon, atomic number 10
d. Fluorine, atomic number 9
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Answer:
Neon, atomic number 10, is stable.
Explanation:
Valencia electrons are the electrons found in the last electronic layer (called valence orbitals). These electrons are what determine the ability of the atom to form bonds. When an element joins another, it does so through its valence electrons.
The noble gases include the elements of group 18 of the periodic table. The noble gases are characterized by their very low chemical reactivity because they are very stable. This is because they have the full valence layer (complying with the octet rule, that is, they have 8 electrons at their last energy level, with the exception of helium that has 2 electrons), causing them to have a low tendency to capture or release electrons . That is why they are also called inert gases.
The Neon, whose atomic number is 10, belongs to the group of noble gases. So this element is stable.
Neon is the most stable because it has 8 valence electrons. when an element has full number of valence electrons, they become stable.
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Both ionic and covalent bonds can be used to characterize the bonds in the molecule MgSO₄.
Magnesium sulfate, or MgSO₄, has ionic and covalent bonds throughout its structure.
Magnesium (Mg) and oxygen (O) form a mainly ionic connection in MgSO₄. Easily donating two valence electrons to oxygen, magnesium forms the ions Mg₂⁺ and SO₄²⁻. The metal (Mg) and the non-metal (O) in this ionic connection are both metals.
The bonds between sulfur (S) and oxygen (O), on the other hand, are covalent. Sulfur and oxygen share electrons to form covalent bonds in the sulfate (SO₄) ion. Two non-metal atoms (S and O) share electrons through this covalent connection.
Option C is the right response since MgSO₄ possesses both ionic and covalent bonds as a result.
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