The postulate of Dalton's atomic theory which still holds is that
atoms can neither be created nor destroyed
the particles of the same element are exactly alike
particles of different elements combine in simple whole number ratio
all elemets are made of small indivisible particles
Correct answer is A
Postulates of Dalton’s atomic theory can used to explain the behavior of matter:
All matter is composed of small tiny particles called atoms. In Greek the word atom is termed as indivisible. The atoms can not be further broken down.
All atoms are indivisible, indestructible, and unchangeable. Atom of an element cannot be created, divided, destroyed, or split into smaller particles or transformed into atoms of other elements or transformed into other atoms in a chemical reaction. They are simply rearrangement of new compound. Dalton’s atomic theory based this hypothesis on the law of conservation of mass and on centuries of experimental evidence.
The processes which return carbon (IV) oxide to the atmosphere include
respiration, decay and combustion
photosynthesis, respiration and transpiration
ozone depletion, combustion and decay
photosynthesis, decay and respiration
Correct answer is A
No explanation has been provided for this answer.
15.3cm3
87.3cm3
552.0cm3
97.0cm3
Correct answer is D
(V1/T1) = (V2/T2)
T1 = 3+273 = 276K
∴ (92/276) = (V2/291)
T2 = 18 + 273 = 291K
V2 (92 * 291)/276
= 97.0\(cm^3\)
Which of the following chloride would exhibit the least ionic character?
MgCl2
CaCl2
LiCl
AlCl3
Correct answer is D
No explanation has been provided for this answer.
Which of the following statement is true of a proton?
The mass of a proton is 1840 times the mass of electron
The total mass of the protons in a particular nucleus is always half the nuclear size
The mass of a proton is one - twelfth the molar mass of carbon
The mass of a proton is 1.0008g
Correct answer is D
No explanation has been provided for this answer.