What is the main hitch or problem in getting fusion to occur?

Answer:

there are 4

Explanation:

Answer:

Synthetic

Explanation:

I just took the quiz and got it right

Answer:

A- Synthetic

Explanation:

just took the quiz

So, neon has a molar mass of 20.18 g/mol , which means that every mole of neon has a mass of 20.18 g . Now, you know that one mole of any element contains exactly 6.022⋅1023 atoms of that element - this is Avogadro's number.

Hope this helped

Answer:

firstly:scientist communicate with each other to share what they learn

secondly; they question and check each other's work

Answer:

Forming a hypothesis

Explanation:

Cuz why not

Answer:

metals are are solids and has high melting point( except mercury and can also conduct heat and electricity, where non-metals may be solids also but,is brittle such as :diamonds etc... Its a bad conductor for heat and has low melting points

Answer:

1.85 × 10⁻⁶

Explanation:

0.0003 ÷ 162 = 1.851851852 × 10⁻⁶ ⇒ 1.85 × 10⁻⁶

Hope that helps.

The significant figure in the answer should be one here, since the number 0.0003 contains only one significant figure. Hence, the answer is 2 × 10⁻⁶.

Significant figures are digits in a quantity with certain values along with some uncertain digits. The counting of significant figures of a number should follow some rules.

The zeros after the decimal point which is not following a nonzero number are not significant. Therefore, there is only one significant figure in the number 0.0003.

For any arithmetic operation, the number of significant figures in the result should be equal to the one in operation that is with least significant figures.

Here.  162 have 3 significant figures. Therefore, the result should contain only one significant figure.

0.0003 /162 = 1.85  × 10⁻⁶.

Then the result with correct significant figures is rounded to 2 × 10⁻⁶.

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Answer:

A chemist

I hope this helped :D

Answer:

Percent yield = 21%

Explanation:

Find:

Percent yield

Computation:

1 mol O₂ produces 2 mol NO₂

So,

10 mol O₂ produces 20 mol NO₂

Percent yield = [Actual yield / Theoretical yield]100

Percent yield = [4.2 / 20]100

Percent yield = 21%

The percent yield for the reaction is 21%

From the question,

We are to determine the percent yield for the reaction.

First, we will determine the theoretical yield for the reaction

From the given balanced chemical equation for the reaction

2 NO (g) + O₂ (g) → 2 NO₂ (g)

This means,

2 moles of NO reacts with 1 mole of O₂ to produce 2 moles of NO₂

From the given information,

Number of moles of O₂ that reacted = 10.0 moles

Since,

2 moles of NO reacts with 1 mole of O₂ to produce 2 moles of NO₂

Then,

2×10 moles of NO will be required to react with the 10 moles of O₂ to produce 2×10 moles of NO₂

That is,

20 moles of NO will be required to react with the 10 moles of O₂ to produce 20 moles of NO₂

∴ 20 moles of NO₂ will be produced during the reaction.

This is the theoretical yield

Now, for the percent yield of the reaction,

Using the formula

[tex]Percent\ yield = \frac{Actual\ yield }{Theoretical\ yield} \times 100\%[/tex]

From the question

Actual yield = 4.2 mole

∴ Percent yield for the reaction = [tex]\frac{4.2}{20 }\times 100\%[/tex]

Percent yield for the reaction = [tex]\frac{420}{20}\%[/tex]

Percent yield for the reaction = 21%

Hence, the percent yield for the reaction is 21%

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Answer:

Condensation starts to occur throughout the liquid instead of just on the surface.

Answer: Easy,the answer is the letter D

Answer: Thus X is Plutonium

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of alpha decay :

[tex]_{Z}^{A}\textrm{X}\rightarrow _{Z-2}^{A-4}\textrm{Y}+_2^4\textrm{He}[/tex]

where Z = atomic number

A= mass number

X and Y = atomic symbol of elements

[tex]_{Z}^{A}\textrm{X}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}[/tex]

Thus [tex]_{94}^{239}\textrm{Pu}\rightarrow _{92}^{235}\textrm{U}+_2^4\textrm{He}[/tex]

Thus X is Plutonium with atomic number 94 and mass number 239

Answer:

the answer is D on edge

Explanation:

Answer:

A) Ca(s) + C(s) + 3/2 O₂(g) → CaCO₃(s)

Explanation:

Standard enthalpy of formation of a chemical is defined as the change in enthalpy durin the formation of 1 mole of the substance from its constituent elements in their standard states.

The consituent elements of calcium carbonate, CaCO₃, in their standard states (States you will find this pure elements in nature), are:

Ca(s), C(s) and O₂(g)

That means, the equation that represents standard enthalpy of CaCO₃ is:

Is the equation that has ΔH° = -1207kJ/mol

Answer:

Complex  System

Explanation:

Given that, a descriptive scientific investigation is one of the three main types of investigation which formulates and quantify the natural phenomenon.  This natural phenomenon oftentimes involves Complex System, such as microscopic organisms, thereby, scientists often make observations to understand the interacting parts of this COMPLEX SYSTEM

Hence, the right answer is a COMPLEX SYSTEM

Answer:

When changing state of aggregation, the particles change their kinetic energy, decreasing or increasing, if their kinetic energy decreases the collision between the particles is less, and therefore less heat is released and more space will exist between them, this is an example of the states of aggregation that occupy large expandable volumes such as gas.

As the particles get closer, the molecules are closer and collide in a greater way, thus generating that the kinetic energy increases, the friction also and these particles are closer to each other, compressing the space and limiting their movement up to a point.

Explanation:

The states are three, solid liquid and gaseous-

In the solid state there is less distance between the particles, greater density of the body and greater force of friction or collision.

On the other hand, in the solid state the particles are more distended but up to a limit they expand, different from the gaseous state that their particles expand more and without a limit.

The states are modified according to the different temperatures that the body undergoes, at a higher temperature a higher kinetic energy and greater friction are usually reached, generating relaxed states such as liquid and gas, and at lower temperatures it is the reverse effect.

Answer:

activasion energy

Explanation:

Answer:

The difference between the two is that plant have three extra "components" than animal. The three extra components include a different sort of vacuole, chloroplast, and a cell wall.

Explanation:

Answer:

The statement that best describes pseudoscience is that it lacks a process for collecting data

Answer: not a branch of science and involves beliefs and opinions

Explanation:

Answer:

False

Explanation:

Answer:

false

Explanation:

pressure has nothing to do with the phases of a substance.

Answer:

30 g 0f NaOH.

Explanation:

The following data were obtained from the question:

Molarity of NaOH = 0.25 M

Volume = 3 dm³

Mass of NaOH =?

Next, we shall determine the number of mole of NaOH present in 3 dm³ of 0.25 M NaOH solution.

This can be obtained as follow:

Molarity of NaOH = 0.25 M

Volume = 3 dm³

Mole of NaOH =?

Molarity = mole /Volume

0.25 = mole of NaOH/3

Cross multiply

Mole of NaOH = 0.25 × 3

Mole of NaOH = 0.75 mole

Finally, we shall determine the mass of NaOH as follow:

Mole of NaOH = 0.75 mole

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of NaOH =.?

Mole = mass /Molar mass

0.75 = mass of NaOH /40

Cross multiply

Mass of NaOH = 0.75 × 40

Mass of NaOH = 30 g

Therefore, 30 g 0f NaOH is present in the flask.

The mass of NaOH in 0.25 M sample has been [tex]\rm\bold{ 30\;g/dm^3}[/tex].

The molarity has been defined as moles of sample present in a liter of solution.

The molarity of given NaOH solution has been 0.25 M. It has been stating that 0.25 moles of NaOH has been present in a liter of solution.

The mass of sample present in 1 cubic decimeter has been the mass of sample in a liter of solution as:

[tex]\rm 1\;dm^3=1\;L[/tex]

The molarity (M) has been given as:

[tex]M=\dfrac{\text {mass}}{mwt}\;\times\;\dfrac{1}{V(L)}[/tex]

Where, the molarity of NaOH sample has been, [tex]M=0.25\;\text M[/tex]

The molar mass of NaOH has been, [tex]mwt=40\;\text {g/mol}[/tex]

The volume of solution has been, [tex]V=3 \;\text L[/tex]

Substituting the values for mass of NaOH:

[tex]0.25=\dfrac{mass}{40}\;\times\;\dfrac{1}{3} \\mass=0.25\;\times\;40\;\times\;3\\mass=30\;\text g[/tex]

The mass of NaOH in 0.25 M sample has been [tex]\rm\bold{ 30\;g/dm^3}[/tex].

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Answer:

Explanation:

250 cm^3 of 0.2 moldm-3 H2SO4 can be prepared from 150cm^3 of 1.0 moldm^-3 by dilution.

150cm^3 of the 1.0 moldm^-3 stock solution is measured out using a measuring cylinder and transferred into a 250 cm^3 standard volumetric flask and made up to mark. The resulting solution is now 250cm^3 of 0.2 moldm-3 H2SO4.

Answer:

soild from carbon dioxide

Answer:

3.73E-22 particles

1 mole is equal to 6.022E-23 particles (known as avogadro's number). Multiplying 6.20 by 6.022E-23 will cancel out moles and give you particles.

Answer:

Burning Paper

Explanation:

Burning Paper is an example of a chemical change because;

-  A new substance called  ''Ash'' is formed.

- It is an irreversible reaction.

The volume of the box taking significant figures into account is 38.8125 ≈39 cm³.

The amount of space occupied by a three-dimensional object or region of space, expressed in cubic units (cm³).

It means, the amount of three dimensional space that a closed figure can occupy is measured by its volume.

Formula for volume=length ×breadth ×height

To calculate the volume of the box,

volume=length × breadth × height

volume=4.5×5.750×1.50

volume=38.8125   ≈39 cm³.

Hence, the volume of the box taking significant figures into account is 38.8125 ≈39 cm³.

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Diamond and graphite are allotropes of carbon  and have various differences in their physical properties.

Explanation:

Diamond:

Graphite:

This is the comparison of the physical properties of two forms of carbon: diamond and graphite

Carbon and Diamond are allotropes of carbon having  different physical properties.

In diamond there is a three dimensional network of strong covalent bonds. This makes diamond extremely hard.

On the other hand, in graphite there are flat layers of carbon atoms. These layers are held by weak van der Waal’s forces and hence can easily slip one over the other. This makes graphite extremely soft and slippery.

In diamond all the four valence electrons carbon are involved in covalent bonds and are not free to conduct electricity. This makes diamond a bad conductor of electricity. In graphite, the fourth valence electron is relatively free, can move from one carbon atom to the other in a layer, and hence is responsible for conducting electricity. Hence, graphite is a good conductor of electricity.

In diamond as well as in graphite carbon atoms are held by strong net work of covalent bonds. Therefore, both have very high melting points.

Therefore, we can compare the physical  properties of carbon and diamond.

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Answer:

1) law of conservation of mass

2) volatile

3) endothermic

4) chemical property

5) exothermic

6) density

7) physical change

8) chemical change

9) physical property

10) chemical reaction

Answer:

The correct answer is 25 %

Explanation:

According to the chemical reaction:

Xe(g) + 2 F₂ (g) → XeF₄ (g)

1 mol of Xe(g) reacts with 2 mol of F₂(g), so the stoichiometric ratio os reactants is 2 mol F₂/mol Xe.

We have 2.2 mol Xe and 2.0 mol F₂, so the ratio is:

2.0 mol F₂/2.2 mol Xe = 0.909 mol F₂/mol Xe

The molar ratio of reactant we have is lower than the required, so F₂ is the limiting reactant.

By using the limiting reactant, we calculate the theoretical amount of product (XeF₄). For this, we know that 1 mol of XeF₄ is formed from 2 mol of F₂ (1 mol XeF₄/ 2 mol F₂), and we have 2.0 mol F₂:

2.0 mol F₂ x (1 mol XeF₄/ 2 mol F₂)= 1 mol XeF₄

If we only obtained 0.25 mol XeF₄, the percent yield of the experiment is:

Yield = experimental amount/theoretical amount x 100%

        = 0.25 mol XeF₄/ 1 mol XeF₄ x 100% = 25 %

The percent yield of the solution is 25%.

The equation of the reaction is;

Xe(g) + 2F₂ (g) → XeF₄ (g)

From the reaction equation;

1 mole of Xe reacts with 2 moles of F2

2.2 moles of Xe will react with 2.2 moles × 2 moles /2 moles

= 4.4 moles of F2

We can see that there is not enough  F2 hence it is the limiting reactant

2 moles of F2 yields 1 mole of XeF4

2 moles of F2 yields 2 moles ×  1 mole/2 moles = 1 mole of XeF4

% yield = actual yield/Theoretical yield × 100

% yield =  0.25 mole/ 1mole × 100

% yield =  25%

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Answer:

4. 915 cm^3

Explanation:

Length = 22.0cm

Breadth = 13 cm

Thickness = 3.2 cm

Volume = Length * Breadth * Thickness

Volume =  22 * 13 * 3.2

Volume = 915.2 cm^3

Volume = 915cm^3. The correct option is option 4.

Answer:

When an object is allowed to fall,the concentrated gravitational potential energy is converted into the kinetic energy of motion. if there is no air resistance or other restrictions all of the potential energy will be converted to kinetic energy when the object has fallen the distance H

Explanation

When an object is allowed to fall,the concentrated gravitational potential energy is converted into the kinetic energy of motion. if there is no air resistance or other restrictions all of the potential energy will be converted to kinetic energy when the object has fallen the distance H

Answer:

B

Explanation:

The control group is the only answer given that would be found in an experimental investigation. This is because it won't be changed during the experiment. It will remain neutral.