There are so many copyright restrictions on open source software that it is rarely used.
True or false

Answer:

In its astrobiology roadmap, NASA has defined the principal habitability criteria as "extended regions of liquid water, conditions favorable for the assembly of complex organic molecules, and energy sources to sustain metabolism". In August 2018, researchers reported that water worlds could support life.

Answer:

Yes it is. 0.34 kg = 340 g (Kilograms and grams)

Explanation:

When we convert from kg to grams we multiply by 1000 because kilo mean 1000.

0.34*1000= 340

The reaction of cis-but-2-ene and trans-but-2-ene is a classic example of stereospecificity. It is important to note that this reaction yields predominantly or exclusively one of the constitutional isomers when more than one is possible, demonstrating that this reaction is stereospefic.

Stereospecificity is the phenomenon by which molecules react in such a way that the reaction products have the same orientation of their atoms in space as the reactants. This phenomenon is exhibited in the reaction of cis-but-2-ene and trans-but-2-ene, which yield different stereoisomers. This reaction is stereospecific because it yields predominantly or exclusively one of the constitutional isomers when more than one is possible.

Stereospecificity is an important property of organic reactions. It is of particular importance in the manufacture of pharmaceuticals, where it is necessary to ensure that the final product is the desired stereoisomer. Stereospecificity also helps to make organic reactions more efficient, since the reaction will yield the desired product in a single step.

In the reaction of cis-but-2-ene and trans-but-2-ene, different reactions can occur depending on the orientation of the atoms in the reactants. When the double bond is oriented in the cis-configuration, a reaction can occur in which new carbons are introduced, yielding the cis-stereoisomer. On the other hand, when the double bond is oriented in the trans-configuration, a reaction can occur in which the atoms in the double bond rearrange, yielding the trans-stereoisomer.

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Answer:

Better grasp,

Explanation:

The thumb is longer having the advantage of a better grip, for example humans. If we didn't have a thumb, it would be harder to grab items or hold mugs. Let's take the example of a dog, they can't get the grip of items that well because their thumbs are short.

Answer:

See below

Explanation:

Does not matter that the element is a gas.....go to periodic table to find molar mass.....BUT some gases are diatomic ( like Oxygen (O2) hydrogen(H2) and nitrogen(N2)) ...then you to DOUBLE the molar mass on the periodic table if the gas of concern  is diatomic .

It is observed that the electronegativity difference in the bond between the two atoms is highest in the case of H2O. Thereby, it has a greater ionic bond character.

Pauling proposed quantifying the percentage of ionic character that a chemical link possesses. A complete ionic link would obviously have 100% ionic character, while a covalent bond with an equal share of the charge density has 0% ionic character.

We examine the electronegativity of the two atoms participating in a bond in order to determine its ionic character (or polarity). The connection has a stronger ionic character the larger the difference. The placement of polar bonds in the compound's three - dimensional structure allows us to determine the polarity of the entire complex.

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Answer:

32.52×10¹⁹ atoms

Explanation:

Given data:

Mass of gold = 0.106 g

Number of atoms of gold = ?

Solution:

We will calculate the number of moles first.

Number of moles = mass/molar mass

Number of moles = 0.106 g/ 197 g/mol

Number of moles = 5.4×10⁻⁴ mol

Number of atoms:

1 mole contain 6.022×10²³ atoms

5.4×10⁻⁴ mol ×  6.022×10²³ atoms /1 mol

32.52×10¹⁹ atoms

Answer:

a. 0.228 M

Explanation:

Molarity is a concentration unit, and is defined as the number of moles per litre of solution.

To convert grams into number of moles, divide the mass by the relative molecular mass (Mr) of the compound. The Mr of NaOH can be calculated by taking the sum of the relative atomic masses of Na, O and H with the help of a periodic table.

Mr of NaOH

= 23 +16 +1

= 40

Number of moles of NaOH

= 1.37 ÷40

= 0.03425 moles

Convert the volume of solution into litres:

150mL

= (150 ÷1000) L

= 0.15 L

This means that 0.15L of solution contains 0.03425 moles of NaOH. Molarity is looking at the number of moles for every 1L of solution, thus divide the number of moles by the volume in litres to find the solution's molarity.

Molarity of solution

= 0.03425 ÷0.15

= 0.22833 (5 s.f.)

= 0.228 M (3 s.f.)

Thus, option a is correct.

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Answer:

By forming Biofilms

Explanation:

Legionella pneumophila forms biofilms by using the residual chlorine and hence act as killer of other microbial cells and intracellular pathogens.  It also colonizes within multispecies microbial communities and kills them

Answer:

Explanation:

General Remarks

The balance numbers are the same. (The balance numbers are 2 and 2)

The balance number in front of the O2 is 1.

So for every mole of O2 needed 2 moles of NO2 should be produced.

If 10.0 moles of oxygen is used, then you should get 20 mols of NO2 should be produced.

Formula

% yield = (what was produced / what should have been produced) *100

Givens

What was produced = 7 moles

What should have been produced = 20 moles

Solution

Substitute the givens into the equation

% yield = 8/20 * 100

% yield = 0.40 * 100

Answer: 40%

Answer: B

Explanation: Formaldehyde molecules do not form an extended structure and can freely move past each other

When investigative officers get to a crime scene, they do not need to collect water samples.

A crime scene is a place where an offence has been committed. It is usually cordoned off to enable investigation of the crime and the collection of samples.

When investigative officers get to a crime scene, they do not need to collect water samples.

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Answer:A

Explanation:.

Answer:

\(m_{PbI_2}=18.2gPbI_2\)

Explanation:

Hello,

In this case, we write the reaction again:

\(Pb(NO_3)_2(aq) + 2 KI(aq)\rightarrow PbI_2(s) + 2 KNO_3(aq)\)

In such a way, the first thing we do is to compute the reacting moles of lead (II) nitrate and potassium iodide, by using the concentration, volumes, densities and molar masses, 331.2 g/mol and 166.0 g/mol respectively:

\(n_{Pb(NO_3)_2}=\frac{0.14gPb(NO_3)_2}{1g\ sln}*\frac{1molPb(NO_3)_2}{331.2gPb(NO_3)_2} *\frac{1.134g\ sln}{1mL\ sln} *96.7mL\ sln\\\\n_{Pb(NO_3)_2}=0.04635molPb(NO_3)_2\\\\n_{KI}=\frac{0.12gKI}{1g\ sln}*\frac{1molKI}{166.0gKI} *\frac{1.093g\ sln}{1mL\ sln} *99.8mL\ sln\\\\n_{KI}=0.07885molKI\)

Next, as lead (II) nitrate and potassium iodide are in a 1:2 molar ratio, 0.04635 mol of lead (II) nitrate will completely react with the following moles of potassium nitrate:

\(0.04635molPb(NO_3)_2*\frac{2molKI}{1molPb(NO_3)_2} =0.0927molKI\)

But we only have 0.07885 moles, for that reason KI is the limiting reactant, so we compute the yielded grams of lead (II) iodide, whose molar mass is 461.01 g/mol, by using their 2:1 molar ratio:

\(m_{PbI_2}=0.07885molKI*\frac{1molPbI_2}{2molKI} *\frac{461.01gPbI_2}{1molPbI_2} \\\\m_{PbI_2}=18.2gPbI_2\)

Best regards.

Answer:

It's a liquid when it has changed from solid to a liquid state. (You take ice out from the freezer and it turns to water)

Explanation:

Basic chemistry

Conversion factors are useful in solving problems in which a given measurement must be expressed in some other units of measure.

Conversion factors are helpful in solving issues where one unit of measurement needs to be expressed in another. In general, a measurement's numerical value changes when it is multiplied by a conversion factor, while the quantity being measured's real size stays the same.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value. For instance, 12 inches equals one foot when converting between inches and feet.

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The silica content and viscosity of the magma increase as it rises through the continental crust, finally generating andesitic-rhyolitic magmas as a result of partial melting of the crust. That's accurate.

Stratovolcanoes frequently release thick lava flows made of andesite magma, some of which can be several kilometers long. Strong explosive eruptions from andesite magma can also result in pyroclastic flows, surges, and massive eruption columns. At temperatures between 900 and 1100 ° C, andesites erupt.

Wet partial melting of the mantle results in the formation of andesitic magma. Water is in contact with the mantle beneath the ocean. The mantle will heat up and water will be forced into it when subduction, or continental plates sliding apart, takes place.

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One time explanation of one observation is a hypothesis.

Whenever, an assumption is made juts by observation and without proper testing then that is referred as an hypothesis.

For example- If my friend is late, so I might assume that he or she must have been stuck in traffic. So, this assumption is not tested yet and is made based on my observation. So, this is a hypothesis.

Whenever, a conclusion is given after several experiments and testing after observing something in science is referred as scientific theory.

For example- Atomic theory given by Dalton was based on several experiments. However, theories can also be proved wrong as Dalton's theory was proved wrong later on my JJ Thomson.

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The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.

An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.

Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %).  The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.

The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.

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Answer:

Was is a hydrocarbon therefore when heated some co2 escapes but later solidifies

Explanation:

Hope it helps

Answer:

(a) Rate of formation of NO2 is also 0.066M/s

(b) Rate of reaction of O2 gas is 0.033M/s

Explanation:

(a) in one second, according to the equation,

2 moles of NO combines with 2moles of NO2.

Therefore 0.066M NO will still consume 0.066mole NO2.

(b) According to the equation,

2 moles NO consumes 1 mole O2, 0.0666M will consume 0.0333 mole O2

In the given reaction 2Zn+O₂→2ZnO, if we check both side it is observed that Zn is oxidised and O is reduced. Hence, their half reactions are

Zn→Zn²⁺+2e⁻

O₂+4e⁻→2O²⁻

The given reaction is redox reaction in which oxidation and reduction is occurred. On reactant side, the oxidation state of Zn is 0 and on product side it is +2. For oxygen, the oxidation state on reactant side is 0 and on product side is -2. Hence, two electrons are lost by Zn and its half reaction is given as

Zn→Zn²⁺+2e⁻

There are 2 oxygen on reactant side it means four electrons are gained by oxygen. Hence its half reaction is

O₂+4e⁻→2O²⁻

Hence, half reaction of oxidation and reduction is

Oxidation: Zn→Zn²⁺+2e⁻

Reduction: O₂+4e⁻→2O²⁻

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Answer:

no

Explanation:

this answer is because there is no oxygen on the moob

Answer:

Well one good main reason i can think of  is money cause our nation is in a decent amount of economy debt.

Explanation:

Answer:

its sodium hydroxide

Explanation:

The reduction half-reactions for O, P, and Cu:

• O: O2 + 4 e- → 2 O2-

• P: HPO42- + 2 H+ + 2 e- → H3PO4

• Cu: Cu2+ + 2 e- → Cu+

To write the reduction half-reactions for O, P, and Cu, we need to determine the oxidation numbers for each element. The guidelines for assigning oxidation numbers are:

Using these guidelines, we can determine the oxidation numbers for O, P, and Cu:

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Daria had some beach sand with her. The sand has a 72 gramme mass. She calculated the volume using the graduated cylinder below. The graduated cylinder contains 15 mL of sand.

The volume of the sand is calculated using the graduated cylinder below. The sand's bulk is specified as 72 grammes.

We can use the water displacement method to calculate the volume of the sand. Following is a description of how to estimate the amount of sand using the water displacement method:

The graduated cylinder of water should first be measured for volume.

The graduated cylinder's water volume should then be measured after adding the sand to it. The volume of water increases by the same amount.

Let's use the provided problem to implement this approach.

In the beginning, there is 10 mL of water in the graduated cylinder. The graduated cylinder contains 25 mL of water once the sand has been added.

The amount of sand is therefore equal to the difference between the two volumes, which is: Sand volume equals final water volume minus initial water volume (25 - 10 = 15 mL).

As a result, there are 15 mL of sand in the graduated cylinder.

Answer : 15

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Answer:

6

Explanation:

Alkanes undergo substitution reaction so the number of replacement reaction hydrogen is 6

Answer:

The molarity of the solution is 0.697M.

Explanation:

Molarity represents the moles of solute that are contained in 1000mL (1L) of solution.

In this case, we have to calculate the molarity of 703mL solution that contain 0.490 moles:

So, the molarity of the solution is 0.697M.

Answer:

C) F

Explanation:

Valence electrons are the electrons present in the outermost shell of an atom and have the highest energy level of an atom whereas electrons at ground state or lower orbitals have less potential energy.

This is so because orbitals nearby nucleus are strongly bonded with the atomic nucleus and have less energy than an outermost shell.

So, the potential energy states of an atom depend on the number of orbitals. In the given options fluorine with atomic number 9 has less number of orbitals that is 2 orbitals and valence electrons will be present in second orbitals, so fluorine will have the lowest average potential energy states.

Hence, the correct option is "C) F".