HELP PLEASE!!!!!Given that oxygen-16 and oxygen-18 both have an atomic number of 8, how many electrons, protons, and neutrons do these oxygen atoms contain?A) These oxygen configurations contain the same number of subatomic particles - 8 electrons, 6 protons and 10 neutrons.
B) Any oxygen atom contains 8 electrons and 9 neutrons but these vary in the number of protons - 8 and 10 respectively.
C) The oxygen allotropes contain 8 electrons but each contains a different number of neutrons and protons - 8 and 10 respectively.
D) Both oxygen isotopes contain 8 electrons and 8 protons but each contains a different number of neutrons - 8 and 10 respectively.
Copper has been used in electrical wiring for two hundred years. Identify which molecular level property does not contribute to copper's usefulness a material for wiring. A) high ductility B) high malleability C) high conductivity D) high crystallinity
Describe how light is emitted from an atom.
A) As protons absorb energy they travel from the nucleus through the atom emitting light along the way.
B) The light is emitted when energy from sunlight is absorbed by the atom to excite a neutron into a higher level.
C) When the nucleus absorbs sunlight, photons are energized and move to a higher energy level and are then released.
D) Light is emitted from an atom as an electron falls from an excited state to the ground state releasing a photon.
During chemistry, Dan mixes two clear, colorless solution and mixing them produces a yellow precipitate in a clear, colorless final solution as shown by the chemical equation.
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)
What physical evidence indicates that there has been a chemical reaction?
A) The solution changes color.
B) Precipitate formation occurs.
C) The beaker changes temperature.
D) Gas bubbles form during the reaction.
Answers
Related Questions
As the activation energy of a reaction decreases, the number of molecules with at least this much energy ______________.
Calculate the mass of copper if 2653.8 J of copper is cooled from 155 oC to 23 oC. The specific heat of copper is 0.385 J/g*oC.
Perform the followingmathematical operation, andreport the answer to theappropriate number ofsignificant figures.1204.2 +4.79613 = [ ? ]
Which of the following particles has the greatest mass? A)An alpha particle B) A Beta Particle C) A Proton D) An Electron
Mixture; compounds; elements
Element; compounds; mixture
Compound; elements; compounds
12.The number of _____ determines which element it is.
electrons
protons
positrons
neutrons
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#2...Protons
B) what mass of iron(lll) oxide, Fe2O3, must be consumed to prepare 2.50g of iron metal
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One mole of dihydrogen is required to form one mole of iron, hence you'll need
B) Likewise : 2.50g of Iron is
(2) 44 g
(3) 33 g
(4) 29 g
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so 1,5 moles would have 1,5*44=66g
the answer is 1) 66g
(2) Cr, Cl2, C (4) Se, Sn, Sr
Answers
Periodic table contain element of various states like solid, liquid and gases. Thus the that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option.
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, and metalloids
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar. It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar are gases in nature.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He. Hence option A is correct option
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Answer: Option (1) is the correct answer.
Explanation:
STP means standard temperature and pressure where temperature is 273.15 K and pressure is 1 bar or 0.98 atm.
It is known that only bromine (Br) and mercury (Hg) are in liquid form at STP. Whereas noble gases like He, Ne, Ar etc are gases in nature.
Hence, given elements are differentiated as follows.
HF - solid, Hg - liquid, and He - gas
Ba - solid, - liquid, and B - solid
Cr - solid, - gas, and C - solid
Se - solid, Sn - solid, and Sr - solid
Thus, we can conclude that list of elements contains a solid, a liquid, and a gas is HF, Hg, He.
b. bauxite
c. iron
d. timber
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All the following are examples of minerals, except timber.
The correct option is d, timber.
What are minerals?
Minerals are solid chemical compounds that have fixed or definite chemical compositions.
Some minerals are calcium, phosphorus, bauxite, iron etc.
Our body needs a very little amount of minerals for the boy's growth.
Timber is wood, which is not a mineral.
Thus, the correct option is d. timber.
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Answer: D. Timber
Explanation:
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Final answer:
Nonpolar covalent bonds form when two atoms of the same element or different elements share electrons equally, resulting in a balanced charge distribution. Examples include Methane (CH4) and molecular oxygen (O2). Another case is the CO2 molecule, which is nonpolar because its polar bond moments cancel out.
Explanation:
This leads to a balanced distribution of charges in the molecule, making it nonpolar. Methane, for instance, consists of a carbon atom that shares four electrons equally with four hydrogen atoms, resulting in a bond where the difference in electronegativity between the carbon and hydrogen atoms is minimal.
Another case is CO₂ where the molecule, though consisting of polar bonds, is overall nonpolar because the geometric layout of the molecule allows for the bond moments to cancel each other out, hence no region of the molecule is more positive or negative than any other. Considering the geometry of the molecule is essential when determining the polarity of a molecule with more than one bond.
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