In UV region measurements, the üsed cell must be Oa. Plastic cell O b. KBr cell C. Fused silica cell d. Glass cell​

Answer:

I have been banned before too, it is not fun :(

Explanation:

this is actually my fourth account cause I also had some deleted

Answer:

Explanation:

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

relative charge = -1

Relative mass = 1.1836

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

He constructed the glass tube and create vacuum in it. He applied electric current between electrodes. He noticed that a ray of particles coming from cathode to wards positively charged anode. This ray was cathode ray.

Properties of cathode ray:

The ray is travel in straight line.

The cathode ray is independent of composition of cathode.

When electric field is applied cathode ray is deflected towards the positively charged plate.

Hence it was consist of negatively charged particles.

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Relative mass of proton= 1

Relative mass of neutron = 1

Relative mass of proton = +1

Relative charge of neutron = 0

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral.

Answer:

Absolutely True :) cause we use it all the time

Land is a natural resource because it is used by living things to meet their needs. The given statement is true.

Natural resources are important commodities and are used on a global scale. This includes the extraction and purification procedures that allow for their usage in economic production or consumption. Land is a natural resource.

Natural resources can be either renewable (meaning there will eventually be more supply available after they are refilled) or non-renewable (meaning there won't be any more available supply to be harvested from once they run out). Land is a natural resource because it is used by living things to meet their needs. The given statement is true.

Therefore, the given statement is true.

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Answer:

1s22s22p63s23p4

Explanation:

Sulfur is located in the p block and has 6 valence electrons (the 2 exponent on the 3s and the 4 exponent on the 3p add up to 6)

The location and energy of all the valence electrons of electrically-neutral sulfur ( S ) is 3s₂3p₄.

Chemical element sulfur has the letter S and atomic number 16. It is multivalent, nonmetallic, and plentiful. Sulfur atoms normally combine to create cyclic octatomic molecules, which have the chemical formula S8. At room temperature, elemental sulfur is a crystalline solid that is brilliant yellow.

In addition to being a fungicide and an ingredient in black gunpowder, sulfur is used to vulcanize black rubber. However, the majority of sulfur is utilized in the creation of sulfuric acid, which is arguably the most significant chemical produced by western civilisations.

Sulfur can be found naturally and in metal sulfide ores. Natively, it may be found close to hot springs and volcanoes.

Thus, option B is correct.

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Answer:

Br

Explanation:

Answer:

are there any options for us to choose from? or is it just fill in the blank

Waves of sound energy move in the form of vibration from the source of sound energy.

Waves is a kind of disturbance that can travel through a medium from one point to another point.

Sound waves is also a type of wave in which energy is travelled from one point to another point through the vibration from the source of sound.

Hence energy travel in the form of vibration.

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Answer:

Calculate the energy of a photon having a wavelength of 7.71 x 10^-5 m.​

Explanation:

The compound : C₄₀H₄₄N₄O

The empirical formula is the smallest comparison of atoms of compound =mole ratio of the components

The principle of determining empirical formula

• Determine the mass ratio of the constituent elements of the compound.  

• Determine the mole ratio by dividing the percentage by the atomic mass

The mol ratio of composition : C : H : N : O

[tex]\tt \dfrac{80.66}{12}\div \dfrac{7.39}{1}\div \dfrac{9.39}{14}\div \dfrac{2.68}{16}\\\\6.722\div 7.39\div 0.671\div 0.1675\rightarrow divide~by~smallest(0.1675)\\\\40\div 44\div 4\div 1[/tex]

The percent yield : 79.9%

Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

Fe(s)+S(s)⇒FeS(s)

The reaction produces 6.29 g of iron(II) sulfide⇒an actual yield

The maximum  amount that can be produced is 7.87 g ⇒ A theoretical yield

[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{6.29}{7.87}\times 100\5=79.9\%[/tex]

Answer:

B. Although both involve combining with oxygen, combustion is more rapid.

Explanation:

Both rusting and combustion involves are combination in which a substance reacts with oxygen.

Answer:

B. Although both involve combining with oxygen, combustion is more rapid

Explanation:

a p e x

If the volume of the system is decreased, no shift will occur

In the equilibrium system, according to Le Chatelier, if there is a reaction there will be action  

Reaction = - action  

The reaction taken by the system is to shift the reaction to the right or left.  

The composition of chemical reactions in equilibrium can be influenced by temperature, pressure, and concentration.  

While on the change in pressure(volume), then the addition of pressure, the reaction will shift towards a smaller reaction coefficient  ((the fewest moles of gas  )

This pressure usually affects the gas equilibrium system(only count the number of moles of gases)

Reaction

NO₂ (g)+CO (g)↔NO(g)+CO₂(g)

The reactant side of the equation has 2 moles of a gas(1 mole NO₂ and 1 mole CO) ; the product side has 2 moles (1 mole NO and 1 mole CO₂)

So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur

Explanation:  an ionic bond, is when a atom basically gives a electron to another, forms when one atom becomes stable by losing its outer electrons and the other atoms become stable by gaining the electrons covalent bonds form when sharing atoms results in the highest stability possible

Complementary Base Pairing. Specific pairs can only go together, so when guanine and adenine pair up, its Complementry Base Pairing :)

Hope this helps! Please correct me if im wrong :)

Answer:

Explanation:

The final pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the final pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question

58.6 kPa = 58600 Pa

We have

[tex]P_2 = \frac{58600 \times 250}{655} = \frac{14650000}{655} \\ = 22366.4122... \\ = 22366[/tex]

We have the final answer as

Hope this helps you

Answer:

This question is incomplete

Explanation:

This question is incomplete. However, in order to calculate the percentage yield of an extraction/isolation, the formula to be used is below

percent yield = isolated mass/total mass × 100

The mass of the yield (which can also be referred to as isolated mass) was provided to be 0.15 g but the total mass of the (4-chlorophenyl)bis(4-methoxyphenyl)methanol was not provided.

In the completed question that has the total mass or the values to obtain the total mass, the formula mentioned earlier should be used.

Answer:

Zinc (Zn) combines with hydrogen chloride (HCI) to form hydrogen gas(H2) and zinc chloride (ZnCl2).

[tex]\sf Zinc+Hydrogen\:Chloride \longrightarrow Hydrogen\:gas+Zinc\:Chloride[/tex]

[tex]\sf Zn+HCL \longrightarrow H_2+ZnCl_2 [/tex]

[tex]\sf Zn+2HCL\longrightarrow H_2+ZnCl_2 [/tex]

Answer:

Explanation:

Answer is C

Answer:

(c) P and Sb

Explanation:

We can determine the number of valence electrons of an element:

Which pair of elements have the same valence electronic configuration of np³?

(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.

(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².

(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.

(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².

(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.

The pairs of elements that contain the similar valence electronic should be option (c) P and Sb

In the case when it belongs to Groups 1 and 2, the no of valence electrons should be equivalent to the number of groups and the differential electron occupies the s subshell. On the other hand, in the case when it belongs to the groups 13-18, the number of valence electrons should be equivalent to "Number of group - 10" and the differential electron occupies the p subshell.

This question is incomplete. Please find the completed question below.

Which pair of elements have the same valence electronic configuration of np³?

(a) O and Se. NO. They belong to the group 16 and the valence electron configuration is ns² np⁴.

(b) Ge and Pb. NO. They belong to the group 14 and the valence electron configuration is ns² np².

(c) P and Sb. YES. They belong to the group 15 and the valence electron configuration is ns² np³.

(d) K and Mg. NO. They belong to the groups 1 and 2 and the valence electron configuration is ns¹ and ns².

(e) Al and Ga. NO. They belong to the group 13 and the valence electron configuration is ns² np¹.

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Answer:

14.2g

Explanation:

The reaction expression is given as:

        C₃H₈  +  5O₂ → 3CO₂ + 4H₂O

Given mass of propane combusted;

   4.74g

Unknown:

Mass of carbon dioxide produced  = ?

Solution:

To solve this problem, we find the number of moles of the given propane;

   Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

Molar mass of C₃H₈ = 3(12) + 8(1) = 44g/mol

   Number of moles  = [tex]\frac{4.74}{44}[/tex]  = 0.11mol

From the balanced reaction equation:

          1 mole of C₃H₈ will produce  3 moles of CO₂

          0.11mole of C₃H₈ will produce 3 x 0.11  = 0.33mole of  CO₂

Mass of  CO₂ = number of moles x molar mass

    Molar mass of  CO₂ = 12 + 2(16) = 44g/mol

Mass of  CO₂ = 0.33 x 44  = 14.2g

Answer:

can you get a picture that is in higher quality? we can't read what it's saying

Answer:

Heat transferred in the process is 19019J

Explanation:

Using the equation:

Q = S×m×ΔT

We can solve the energy transferred in the process, Q, where:

S is specific heat = 4.18J /(g°C)

m is mass = 350g

ΔT is change in temperature (21°C - 8°C = 13°C)

Q = 4.18J/(g°C)×350g×13°C

Q = 19019J

Answer:

Therefore, in a 250 g of solution, 5% needs to be KCl, i.e. 5% x 250 = 12.5 g of KCl is needed.

Explanation:

Answer:

18.33 ×10²³ atoms

Explanation:

Given data:

Molar mass of sulfuric acid = 98.1 g/mol

Mass of sulfuric acid = 75.0 g

Number of of oxygen atom present = ?

Solution:

Number of moles of sulfuric acid:

Number of moles = mass/molar mass

Number of moles = 75.0 g/ 98.1 g/mol

Number of moles =0.761 mol

one mole of  sulfuric acid  contain four mole of oxygen atom.

0.761 mol × 4 = 3.044 mol

1 mole = 6.022×10²³ atoms of oxygen

3.044 mol ×  6.022×10²³ atoms of oxygen / 1mol

18.33 ×10²³ atoms

Answer:

I think both photosynthesis and cellular respiration breaks down glucose

Explanation:

sorry if i'm wrong

Answer:

c

Explanation:

both photosynthesis and cellular respiration brakes down glucoso

Answer:

Its D

Explanation:

Answer:

Ca +  CO₃²⁻   → CaCO₃

Explanation:

Solution:

      Sodium carbonate  = Na₂CO₃

      Calcium chloride = CaCl₂

      Calcium carbonate is precipitated

Reaction equation:

           Na₂CO₃  +  CaCl₂  →  CaCO₃ + 2NaCl

The net ionic equation:

        2Na⁺ + CO₃²⁻   + Ca + 2Cl⁻  → CaCO₃ + 2Na⁺ + Cl⁻

the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:

              Ca +  CO₃²⁻   → CaCO₃

Answer:

If we assume that there will be enough Hydrogen for the reaction to occur, then there will be 8 moles of NH

Explanation:

The balanced equation will look like this:

4N2 + 4H2 -> 8NH

Answer:

This question is incomplete

Explanation:

This question is incomplete but the completed question is in the attachment below. To determine the net ionic equation, one must first write the complete equation which is shown below

LiNO₃ + NaC₂H₃O₂ ⇒  LiC₂H₃O₂ + NaNO₃

The ionic equation represented from the above equation will be

Li¹⁺ NO₃⁻ + Na¹⁺ C₂H₃O₂¹⁻  ⇒  Li¹⁺ C₂H₃O₂¹⁻ + Na¹⁺NO₃¹⁻

Because the resultant NaNO₃ formed is an ionic compound (which does not form a molecule), the correct option from the options provided is the first option

Answer:

You would give four tablets of clopidogrel 75 mg/TAB STAT.