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3 years ago

In any chemical compound, the elements are always combined in the same proportion by ___.?

Chemistry

2 answers:

irga5000 [103]3 years ago

6 0

Answer is: elements are always combined in the same proportion by mass.

Law of multiple proportions or Dalton's Law said that the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.

For example, nitrogen(I) oxide N₂O; m(N) : m(O) = 2·14 : 16 = 7 : 4.

Another example, water (H₂O) is made of two hydrogen atoms and one oxygen atom:

m(H) : m(O) = 2·1 : 16 = 1: 8.

Andru [333]3 years ago

6 0

Answer:

mass

Explanation:

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True or false: Energy is always transferred from high kinetic energy (temperature) too low kinetic energy (low temperature)

Roman55 [17]

Answer:

true

Explanation:

Temperature is a measure of the average kinetic energy of the molecules, so energy would naturally be transferred from the molecules with more kinetic energy to the molecules with less kinetic energy

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3 years ago

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3 years ago

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The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.

astraxan [27]

Answer:

It will take 6.6 hours for 75% of the lead to decay.

Explanation:

The radioactive decay follows first order rate law

The half life and rate constant are related as

$k=rate constant=\frac{0.693}{halflife}=\frac{0.693}{3.3}=0.21h^{-1}$

The rate law for first order reaction is

$time=\frac{1}{k}(ln[\frac{A_{0}}{A_{t}}]$

Where

A0 = initial concentration = 1 g

At= final concentration = 0.25 g (as 75% undergoes decay so 25% left]

$time=\frac{1}{0.21}(ln(\frac{1}{0.25})=6.6hours$

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3 years ago

An alkene adds hydrogen in the presence of a catalyst to give 3,4-dimethylhexane. Ozonolysis of the alkene followed by treatment

slamgirl [31]

The structure of alkene is given below in the image.

Alkenes are described as both branched or unbranched hydrocarbons that possess at least one carbon-carbon double bond (CC) and feature a popular system of CnH2n [1].

Alkanes are organic compounds that encompass single-bonded carbon and hydrogen atoms. The formulation for Alkanes is CnH2n+2, subdivided into 3 companies – chain alkanes, cycloalkanes, and branched alkanes.

The geometry around each carbon atom is based totally on a trigonal planar shape, due to the fact, that each carbon has three electrons around it. This must make the angle of each bond one hundred twenty.

Learn more about Alkanes here: brainly.com/question/17040500

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2 years ago

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3 years ago

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