Answer : C
Explanation:
a star produces energy by combining two atoms into one creates a powerful burst of energy
Answer : Option B) All atoms of a single substance are identical.
Explanation : The scientist John Dalton proposed the atomic theory which had the postulates as follows.
i) All matter/substances consists of indivisible particles known as atoms.
ii) Atoms of the same element/substance are similar in mass,shape and size, but differ from the atoms of other elements.
iii) Atoms obey the law of conservation of energy which says atoms cannot be created or destroyed.
iv) Atoms of different elements may combine with each other in a fixed, simple, whole number ratios to form any compound atoms.
v) Atoms of same element can combine in ratio with more than one to form two or more compounds.
vi) The atom is considered to be the smallest unit of matter that can take part in a chemical reaction
Answer:
[NaOH] = 0.045 M
[red dye] = 0.031 M
Explanation:
The NaOH and the red dye will not react between them, so, the process that it's occurring is only a dilution. The final volume of the solution will be the volume of the flask, which is 100 mL.
The number of moles (n) of each substance will not vary, and it's calculated by the multiplication of the concentration (C) by the volume (V). If 1 is the initial solution, and 2 the diluted:
n1 = n2
C1*V1 = C2*V2
For NaOH:
C1 = 0.150 M
V1 = 30.0 mL
V2 = 100 mL
0.150*30 = C2*100
100C2 = 4.5
C2 = 0.045 M
For the red dye:
C1 = 0.125 M
V1 = 25.0 mL
V2 = 100 mL
0.125*25 = C2*100
100C2 = 3.125
C2 = 0.031 M
Answer:
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Explanation:
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Answer:
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