Why could a recycling or recovery machine using a hermetic compressor overheat while in deep vacuum?

Answers

Answer 1

Answer:

Answer:

Explanation:fsthy add

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What does physical change mean?

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Physical change means - a change from one state ( solid,liquid or gas) to another state without change in chemical composition.

Physical change is when no new substances are formed. If there is a chemical substance then physical changes takes affect to its form, but not its chemical composition. Hope this helps.

Please show step by step and I will mark you as brainliest answer ❤️

Answers

Answer: The pH of the solution is 13.

Explanation:

pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.

$pOH=-\log [OH^-]$

We are given:

Concentration of $Ca(OH)_2=0.05mol/dm^3=0.5mol/L$ (Conversion factor: $1L = 1dm^3$ )

1 mole of calcium hydroxide produces 1 mole of calcium ions and 2 moles of hydroxide ions

Concentration of $OH^-=(2* 0.05)=0.1mol/L$

Putting values in above equation, we get:

$pOH=-\log (0.1)\n\npOH=1$

We know:

$pH+pOH=14\n\npH=14-1\n\npH=13$

Hence, the pH of the solution is 13.

Which nuclear decay emission consists of energy, only?(1) alpha particle (3) gamma radiation
(2) beta particle (4) positron

Answers

Answer: (3) gamma radiation

Explanation:

An isotope can decay in 4 process:

1.) Alpha decay: In this process, alpha particles is emitted when a heavier nuclei decays into lighter nuclei. The alpha particle released has a charge of +2 units.

$_Z^A\textrm{X}\rightarrow _(Z-2)^(A-4)+_2^4\alpha$

2.)Beta-decay: In this process, a neutron gets converted into a proton and an electron releasing a beta-particle. The beta particle released carries a charge of -1 units.

$_Z^A\textrm{X}\rightarrow _(Z+1)^A\textrm{Y}+_(-1)^0\beta$

3.) Gamma ray emission: in this process, an unstable nuclei gives off excess energy by a spontaneous electromagnetic process and releases $\gamma -radiations$ . These radiations does not carry any charge and are electrically neutral.

$_Z^A\textrm{X}^*\rightarrow _Z^A\textrm{X}+_0^0\gamma$

4.) Positron decay: In this process, a proton gets converted to neutron and an electron neutrino and releases positron particles. This particle carries a charge of +1 units.

$_Z^A\textrm{X}\rightarrow _(Z-1)^A\textrm{Y}+_(+1)^0e$

In the question, it is given that when an isotope decays, it emits only energy. It is released when an isotope undergoes gamma decay and therefore, the correct answer is gamma radiation.

(3) gamma radiationIt is Electromagnetic energy only

Explain, in terms of electronegativity difference, why the bond in a molecule of HF is more polar than the bond in a molecule of HI.

Answers

Answer:

Explanation:

Electronegativity is defined as the ability of an element to attract electrons that link it to another element.

The covalent bond (chemical bond between atoms where electrons are shared, forming a molecule. This bond is established between non-metallic elements) between two atoms can be polar or nonpolar.

When two atoms have different electronegativities, the one with the highest electronegativity will attract the electrons towards each other, generating a separation between the positive and negative charges. In this way a polar bond is produced, the polarity of which will be as the electronegativity difference between the bonded atoms is greater.

In this case you know the following electronegativities:

H=2.1
F=4.0
I=2.5

So the electronegativity differences in the HI and HCl compounds are:

HF =4.0 - 2.1= 1.9
HI = 2.5 - 2.1= 0.4

Both compounds have element H that is part of it, only differing in F and I. Since F has greater electronegativity than I, the difference in electronegativity in compound HF will be greater. Then the HF compound will be more polar.

Final answer:

The bond in a molecule of HF is more polar than the one in HI due to a greater difference in electronegativity. Fluorine has a higher electronegativity than iodine, resulting in a more polar bond with hydrogen in HF than in HI.

Explanation:

The bond polarity is determined by the difference in electronegativity between two atoms involved in a bond. In the case of HF, the electronegativity difference between hydrogen (H) and fluorine (F) is greater than the electronegativity difference between hydrogen (H) and iodine (I). Fluorine is one of the most electronegative elements, which means it has a high tendency to attract electrons. On the other hand, iodine has a lower electronegativity. Therefore, the bond in a molecule of HF is more polar than the bond in a molecule of HI due to the greater electronegativity difference.

Learn more about Bond Polarity here:

brainly.com/question/35894739

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Helpp chemistry ..........

Answers

Half-life is the time it takes for the radioactive material's mass to decrease by half.

So, half of 96 is 48
half of 48 is 24
half of 24 is 12
half of 12 is 6

96->48->24->12->6

You count how many arrows (->) there is.
Which is 4

Then you use the 12 minutes the question gave you to do:
12 divided by 4
= 3

So, one half-life (Or the time it takes for the radioactive material's mass to decrease in half) is 3 minutes

and every 3 minutes it will decrease by half.

Which of the following is true of a heterogeneous mixture?a. Different samples may not be exactly alike.
b. The density is the same throughout the entire mixture.
c. It is not possible to separate the various parts of the mixture.
d. Taking one sample will enable you to determine what it is made of.

Answers

Answer: Option (a) is the correct answer.

Explanation:

A heterogeneous mixture is defined as the mixture in which distribution of solvent particles is uneven throughout the solution.

For example, a mixture of sand and water is a heterogeneous mixture.

So, when we take different samples for the same heterogeneous mixture then there will be different composition of solute particles in each of them.

On the other hand, in a homogeneous solution there will be even distribution of solute particles into the solvent. Each sample of a homogeneous mixture will contain same composition of solute particles.

Thus, we can conclude that the statement different samples may not be exactly alike, is true of a heterogeneous mixture.

A, a heterogeneous mixture is a mixture where all the particles are not made up of one uniform composition. you can distinguish the different particles

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