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2 years ago

In chemical reactions, what does the principle of conservation of mass mean?

1 answer:

4 0

States that for any system closed to all transfer of matter and energy, the mass must remain constant over time, as the Systems mass cannot change, so quantify can nethier be added or removed

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True or False:

lesya [120]

Answer:

False

Explanation:

Mendeleev was the first scientist to arrange the element in such a periodic order but there was a mistake that he arranged in increasing order of mass.
Today we use the periodic table given by Henry Mosley where atomic no is first priority

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2 years ago

How many atoms of cobalt are in one formula unit of cobalt (III) oxide? one two three six

IrinaK [193]

I believe the correct answer is the second option. There will be two cobalt atoms in one formula unit of cobalt (III) oxide. It has a chemical formula of Co2O3. This compound is does not naturally occur so it is being synthesized. It is mostly used as bleaching agent.

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3 years ago

Read 2 more answers

What characteristics separate the class Insecta from other classes of the phylum Arachnida

inna [77]

Answer:

Three pairs of walking legs, wings, body divided into three segments, pair of sensory antennae.

Explanation:

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3 years ago

Ionic equation for reaction of koh(aq) with cucl2(aq)

marishachu [46]

Answer:

2 KOH(aq) + CuCl2(aq) = 2 KCl(s) + Cu(OH)2

Explanation:

8 0

3 years ago

Alveoli are tiny sacs of air in the lungs. Their average diameter is 4.50 × 10−5 m. Calculate the uncertainty in the velocity of

Arisa [49]

<u>Answer:</u> The uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

<u>Explanation:</u>

The diameter of the molecule will be equal to the uncertainty in position.

The equation representing Heisenberg's uncertainty principle follows:

$\Delta x.\Delta p=\frac{h}{2\pi}$

where,

$\Delta x$ = uncertainty in position = d = $4.50\times 10^{-5}m$

$\Delta p$ = uncertainty in momentum = $m\Delta v$

m = mass of oxygen molecule = $5.30\times 10^{-26}kg$

h = Planck's constant = $6.627\times 10^{-34}kgm^2/s^2$

Putting values in above equation, we get:

$4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg\times \Delta v=\frac{6.627\times 10^{-34}kgm^2/s}{2\times 3.14}\\\\\Delta v=\frac{6.627\times 10^{-34}kgm^2/s^2}{2\times 3.14\times 4.50\times 10^{-5}m\times 5.30\times 10^{-26}kg}=4.424\times 10^{-5}m/s$

Hence, the uncertainty in the velocity of oxygen molecule is $4.424\times 10^{-5}m/s$

8 0

3 years ago