Knowledge of atomic structure has evolved over time. Thomson discovered that atoms contain electrons, Rutherford discovered that most of the mass of an atom is concentrated in its center, and Bohr discovered that electrons orbit the nucleus. Taken together, what do these discoveries demonstrate?
A. the cumulative nature of science
B. the quantitative nature of science
C.the importance of thorough review of scientific papers
D. the importance of not publishing science until it is final
Answers
Related Questions
Which chemical does nicotine cause the brain to release, leading to a pleasurable sensation?
A beaker with water and the surrounding air are all at 24°C. After ice cubes are placed in the water, heat is transferred from:(1) the ice cubes to the air(2) the beaker to the air(3) the water to the ice cubes(4) the water to the beaker
The symbol Na represents a sodium atom that has lost an electron. True False
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 crystallinityDescribe 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.
G. Does the material feel hard to the touch?
H. Will the material float in water?
J. Does the material feel rough or smooth?
Answers
Answer:
i think the answer is f as metals are malleable and ductile
Answer:
F
Explanation: Most metals carry the trait that they are malleable and ductile.
In this reaction there is conservation of
(1) mass, only
(2) mass and charge, only
(3) charge and energy, only
(4) charge, energy, and mass
Answers
Answer: option (4) charge, energy, and mass.
Justification:
1) Charge, energy, and mass are always conserved in every chemical reaction.
Charge, energy and mass are not created nor destroyed, but can be transferred.
2) The charge can only be transferred by the motion of electrons, so the charge can move and end up on a different atom, but when you add up all the charge is conserved.
The charge balance is verified in the given equation since:
left side right side
(1+) + (1-) = 1 - 1 = 0 0
∴ The total charge of the reactants equals the total charge of the products.
3) As for energy, the right side shows the "apparition" of some energy. That means that the reaction is exothermic, i.e. it releases energy.
The energy released is the net result of the difference in the potencial chemical energy of the bonds of the products and the reactants.
The reactants have more chemical energy stored than the reactants, so potential energy was transformed into heat energy.
4) As for the mass, its conservation is verified when you check that there are the same number of particles of each spieces: two particles of hydrogen in the reactand side, such as in the products; and the particles of oxygen are one in the reactants and one in the products.
Answers
The answer to this question is 19
Answers
The statement that is given from above “Water pollution that washes into storm sewers from many places, such as parking lots and lawns, is known as nonpoint-source pollution” is true. This is difficult to treat as the source may come from different points.
Answers
Answer: The correct answer is Option B.
Explanation: The compound given to us is . To write the IUPAC name for this compound, we need to follow some rules:
1. First write the name of the cation with its oxidation state in roman numbers.
2. Then write the name of the anion which may be a polyatomic ion or a non-metal.
3. The anion is used with a suffix '-ide'. Example: For chlorine, the anion would be named as chloride, for sulfur, the anion would be sulfide.
For the given compound, 2 silver atoms are needed to neutralize the charge on 1 sulfur atom.
Hence, the oxidation number of silver atom is '1'. So, the IUPAC name for the compound will be silver (I) sulfide.
Therefore, the correct option is B.
The correct way of writing this would be silver(I) sulfide, but silver sulfide without the (I) is also OK because it isn't always writte, nor is it necessary to write the (I).
Answers
Atoms bond by sharing valence electrons.