Which element is rolled into a foil found and used in your kitchen?
Answers
Related Questions
Given that ka for hclo is 4.0 x 10-8 at 25 °c, what is the value of kb for clo- at 25 c
Based on atomicity , how molecules are categorized
The fuel used in many disposable lighters is liquid butane, C4H10. Butane has a molecular weight of 58.1 grams in one mole. How many carbon atoms are in 4.00 g of butane?
The range in size of most atomic radii is approximately _____.5 × 10−11 m to 2 × 10−10 m2 to 5 nm5 × 10−21 m to 2 × 10−20 m2 to 5 cm
Answers
According to the concept of Avogadro's number, there are 1.505×10²³ molecules in 0.25 mole of O₂.
What is Avogadro's number?
Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
Number of molecules is obtained by multiplying number of moles and Avogadro's number , that is 0.25×6.023×10²³=1.505×10²³ molecules.
Thus, there are 1.505×10²³ molecules in in 0.25 mole of O₂.
Learn more about Avogadro's number,here:
#SPJ6
0,25 mole O2 ---------------- x molecules
1 . x = 0,25 . 6,02.10²³
x = 1,50.10²³ molecules
Answers
We know that the atom contains 15 protons, 15 electrons, and 17 neutrons.
To conclude of which element this radionuclide is, we need to know an atomic number of the element. The atomic number of the element is the number of proton in the nucleus of the atom. If the number of protons is 15, then the atomic number is 15. The element with atomic number 15 is phosphorus (according to the periodic table).
To conclude which phosphorus isotope this radionuclide is we need to know the mass number of the element. The mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. If the number of protons is 15 and the number of neutrons is 17, then the mass number is 17 + 15 = 32.
Thus, this radionuclide is phosphorus-32.
B. isotopes
C. elements
D. molecules
Answers
Ions have negative charges. They also contain more protons than electrons.
I hope this helps!
Answer:
IONS
Explanation:
Answers
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
The answer is:
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Further Explanation
In chemistry, the equation of a reaction or chemical equation is that the symbolic writing of a reaction. The statement of the reagent is written to the left of the equation and so the statement of the merchandise is written to the proper. The coefficient written to the left of a statement could be a stoichiometric coefficient, which describes the quantity of that substance involved in an exceeding reaction relative to a different substance. The reaction equation was first made by the iatrochemist Jean Beguin in 1615. in an exceeding reaction equation, reagents and products are connected by different symbols. The symbol → is employed for one-way reactions, ⇆ for two-way reactions, and ⇌ equilibrium reactions.
The reaction might be an action that always produces interchange of chemical compounds. The initial compounds or compounds involved within the reaction are called reactants. Chemical reactions are usually characterized by chemical changes and can produce one or more products that typically have different characteristics from reactants. Classically, chemical reactions involve changes involving the movement of electrons within the formation and breaking of chemical bonds, although the final concept of chemical reactions can even be applied to the transformation of elementary particles like in nuclear reactions.
Chemical compounds are pure chemicals that encompass two or several elements that will be lessened into its constituent elements by chemical reactions. as an example, dihydrogen monoxide (water, H2O) could be a compound consisting of two hydrogen atoms for every oxygen atom. Generally, this comparison must be fixed thanks to its physical nature, not a comparison made by humans. Therefore, materials like brass, YBCO superconductors, "aluminum gallium arsenide" semiconductors, or chocolate are considered mixtures or alloys, not compounds. The characteristic of compounds is the presence of chemical formulas. The statement provides a ratio of atoms in an exceeding substance, and therefore the number of atoms in an exceedingly single-molecule (therefore the statement of ethene is C2H4 and not CH2. The statement doesn't specify whether the compound consists of molecules; as an example, binary compound (table salt, NaCl) could be a compound ionic.
Learn more
definition of chemical equation brainly.com/question/2416066
definition of Chemical compounds brainly.com/question/2416066
definition of The chemical reaction brainly.com/question/2416066
Details
Grade: High School
Subject: Chemistry
keywords: chemical equation
Answers
The CCl₄ molecule has a tetrahedral geometry. It is a symmetrical molecule. The polarised bond thus cancels out each other due to the geometry of the molecule and that is why CCl₄is nonpolar.
Chlorine has a higher electronegativity than phosphorous. As a result, the chlorine atom has a partial negative charge relative to phosphorous. Since all three chlorine atoms pull electrons from the phosphate atom, the molecule is a polar molecule.
The reason why CCl₄is not soluble in water is because it is not soluble in polar solvents. Both PCl₃ and water are polar molecules. This is due to their shape and the electronegativity difference between the H and O molecules in water and the P and Cl molecules in PCl₃. Therefore, PCl₃in water is soluble.
To learn more about the tetrahedral geometry, refer to the link:
#SPJ6
In CCl4, the carbon molecule forms four bonds; one for each chlorine atom. Each bond contains 2 electrons, so it is satisfied.
In PCl3, Phosphorous forms only 3 bonds with chlorine, which means in order to have 8 valence electrons, it also has a lone pair of electrons, not bonded with chlorine.
Now, in CCl4, picture the shape of the molecule like a plus sign, with the carbon in the middle and the chlorine at the four ends. It is symmetrical, and therefore is nonpolar.
In PCl3, the lone pair electrons push, so to speak, the 3 chlorine atoms away, making a T-shaped molecule. Since the chlorine is more electronegative than carbon, the molecule is unbalenced, making it polar.
b. decrease in the number of neutrons in the nucleus of an atom
c. increase in the number of neutrons in the nucleus of an atom
d. change in the number of protons in a nucleus of an atom
Answers
Answer: Option (d) is the correct answer.
Explanation:
Transmutation is a process which brings changes in the nucleus occur because of change in the number of protons of an atom. Therefore, the atom formed will have different properties from its parent atom.
For example,
A transmutation can be natural or artificial in nature.
Thus, we can conclude that a transmutation reaction must always involve a change in the number of protons in a nucleus of an atom.