How many atoms of hydrogen would need to bond with a single atom of selenium to form a molecular compound?​

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:

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

The question is incomplete, the complete question is;

Which of the following aspects of biotechnology is Not considered to be a moral or ethical issue?

a.research and testing on animals

b.cloning living material

c.reducing research cost

d.damaging the environment

Answer:

c.reducing research cost

Explanation:

Ethical issues arise when a particular course of action is at odds with the generally acceptable moral standard in the society.

Research and testing on animals is contested as an ethical issue by animal rights activists.

Cloning living material  is prohibited among some sections of society and is also being contested as an ethical issue.

Damaging the environment the environment owing to biotechnology research is generally regarded as an ethical issue.

However, reducing research cost is highly acceptable in any research. It does not pose an ethical issue.

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:

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:

I think the answer is B

Explanation:

Answer:

oxygen atom is a unstable atom so it gets attached to other oxygen atom sharing valance electrons to become stable

C is the right ans

Answer:

D. electrons

Explanation:

Chemical bonds occur as a result of electrons (negatively-charged subatomic particles) being transferred among atoms. The transfer happens when electrons are being stolen or shared from an atom to another. The reason behind this is because atom's atomic shells are naturally inclined to be full. Thus, if one atom has extra electrons, that atom will most likely share his electrons to another atom lacking in it.

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:

4

Explanation:

pH scale of acidic is 4.

Answer: 4

Explanation:

Answer:

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

Answer:

λ = 4.46 x 10⁻⁷ m = 446 nm

Explanation:

Applying Law of Conservation of Energy in this condition, we will get the following equation:

Total Energy of Combined Photons = Energy of 1st Photon + Energy of 2nd Photon

hc/λ = hc/λ₁ + hc/λ₂

hc/λ = hc(1/λ₁ + 1/λ₂)

1/λ = 1/λ₁ + 1/λ₂

where,

λ = wavelength of combined photon = ?

λ₁ = wavelength of 1st photon = 853 nm = 8.53 x 10⁻⁷ m

λ₂ = wavelength of 2nd photon = 935 nm = 9.35 x 10⁻⁷ m

Therefore,

1/λ = 1/(8.53 x 10⁻⁷ m) + (9.35 x 10⁻⁷ m)

1/λ = (0.1172 x 10⁷ m⁻¹) + (0.1069 x 10⁷ m)

1/λ = 0.2241 x 10⁷ m⁻¹

λ = 1/(0.2241 x 10⁷ m⁻¹)

λ = 4.46 x 10⁻⁷ m = 446 nm

Answer:

446

Explanation:

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:

Detergent lowers the surface tension of water enough so that bubbles can form. ... Glycerin makes stronger, longer-lasting bubbles, but corn syrup is often substituted in bubble solutions because it is cheaper.

Explanation:

Hope this helps.

It reduces the [surface] tension of the water to form bubbles

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:

The molarity of the unknown acid : 1.18 M

Titration is a procedure for determining the concentration of a solution by reacting with another solution that is known to be concentrated (usually a standard solution). Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range

Titration formula

M₁V₁n₁=M₂V₂n₂

monoprotic acid⇒n₁=1

NaOH monoprotic base⇒n₂=1

[tex]\tt M_1\times 15=1.25\times 14.16\\\\M_1=1.18~M[/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

Answer:

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

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:

TRUE!

Explanation:

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:

2KClO3 —> 2KCl + 3O2

The coefficients are 2, 2, 3

Explanation:

From the question given above, we obtained the following equation:

KClO3 —> 2KCl + 3O2

The above equation can be balance as follow:

There are 2 atoms of K on the right side and 1 atom on the left side. It can be balance by putting 2 in front of KClO3 as shown below:

2KClO3 —> 2KCl + 3O2

Now, the equation is balanced.

Thus, the coefficients are 2, 2, 3

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:

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

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

Answer:

Its D

Explanation:

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:

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:

pH = 13.11

Explanation:

NaOH reacts with HCl to produce H2O and NaCl. pH depends of this reaction. The reactant in excess determine the pH of the solution:

NaOH + HCl → H2O + NaCl

1 mole of NaOH reacts with 1 mole of HCl

To determine limiting reactant we need to find moles of each reactant:

Moles NaOH:

0.011L * (0.800 mol / L) = 0.0088 moles NaOH

Moles HCl:

0.003L* (0.200mol / L) = 0.0006 moles HCl

That means limitng reactant is HCl and moles in excess of NaOH are:

0.0088moles NaOH - 0.0006 moles = 0.0082 moles NaOH =

0.0082 moles OH⁻

In 11.00mL + 50.00mL + 3.00mL = 64.00mL = 0.06400L

[OH-] = 0.0082 moles OH- / 0.064L = 0.1281M OH-

pOH = -log [OH-] = 0.89

pH = 14 - pOH

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