CHEMISTRY MIDDLE SCHOOL

How many ears do cray fish have

Answers

Answer 1
Answer: Cray fish do not have ears they have sensory bristles on their body

Related Questions

MIDDLE SCHOOL

A (n) is the smallest particle of a substance that is made up of two or more atoms. A) atom
B) molecule
C) element
D) compound

Answers

The answer is molecule

The answer would be a molecule

I hope this helped

Soyunghoon Wang

MIDDLE SCHOOL

How many neutrons does an element have if its atomic number is 40 and its mass number is 154

Answers

I am not sure about this answer 194
HIGH SCHOOL

Gaseous methane (CH₄) reacts with gaseous oxygen gas (O₂) to produce gaseous carbon dioxide (CO₂) and gaseous water (H₂O) If 0.391 g of carbon dioxide is produced from the reaction of 0.16 g of methane and 0.84 g of oxygen gas, calculate the percent yield of carbon dioxide.

Answers

Answer : The percent yield of is, 68.4 %

Solution : Given,

Mass of = 0.16 g

Mass of = 0.84 g

Molar mass of = 16 g/mole

Molar mass of = 32 g/mole

Molar mass of = 44 g/mole

First we have to calculate the moles of and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 2 mole of react with 1 mole of

So, 0.026 moles of react with moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of

From the reaction, we conclude that

As, 2 mole of react to give 1 mole of

So, 0.026 moles of react to give moles of

Now we have to calculate the mass of

Theoretical yield of = 0.572 g

Experimental yield of = 0.391 g

Now we have to calculate the percent yield of

Therefore, the percent yield of is, 68.4 %

MIDDLE SCHOOL

Match the term to its description. Gravitional Energy
Mechanical Energy
Nuclear Energy
Thermal Energy

A) Energy stored in the nucleus of an atom
B) The energy of an object due to its movement
C) The potential energy of position
D) Internal energy caused by vibrations of atoms and molecules

Answers

Answer:

See the answer below, please.

Explanation:

Nuclear Energy : A) Energy stored in the nucleus of an atom

Mechanical Energy: B) The energy of an object due to its movement

Gravitional Energy: C) The potential energy of position

Thermal Energy D) Internal energy caused by vibrations of atoms and molecules

Answer:

Identify the form of energy that matches each example.  on edge 2020

Energy from electromagnetic waves:

✔ radiant energy

Energy caused by changes in the structure of a nucleus:

✔ nuclear energy

Energy resulting from movement and vibration of molecules:

✔ thermal energy

Energy an object has because of its position:

✔ potential energy

Explanation:

COLLEGE

Which will not appear in the equilibrium constant expression for the reaction below

Answers

Answer:

Your answer will be B. [C]

Explanation:

I am taking the test right now, and this answer choice is indeed correct.

Pure solids and liquids are not included in the equilibrium constant expression. This is because they do not affect the reactant amount at equilibrium in the reaction, so they are disregarded and kept at 1. Remember that the activity, a, of any solid or liquid in a reaction is equal to 1 oh yea can brainlest
COLLEGE

Combine the two half-reactions that give the spontaneous cell reaction with the smallest E∘. Fe2+(aq)+2e−→Fe(s) E∘=−0.45V I2(s)+2e−→2I−(aq) E∘=0.54V Cu2+(aq)+2e−→Cu(s) E∘=0.34V

Answers

Answer: The spontaneous cell reaction having smallest is

Explanation:

We are given:

The substance having highest positive potential will always get reduced and will undergo reduction reaction. Here, iodine will always undergo reduction reaction, then copper and then iron.

The equation used to calculate electrode potential of the cell is:

The combination of the cell reactions follows:

  • Case 1:

Here, iodine is getting reduced and iron is getting oxidized.

The cell equation follows:

Oxidation half reaction:    

Reduction half reaction:    

Thus, this cell will not give the spontaneous cell reaction with smallest

  • Case 2:

Here, iodine is getting reduced and copper is getting oxidized.

The cell equation follows:

Oxidation half reaction:    

Reduction half reaction:  

Thus, this cell will give the spontaneous cell reaction with smallest

  • Case 3:

Here, copper is getting reduced and iron is getting oxidized.

The cell equation follows:

Oxidation half reaction:    

Reduction half reaction:    

Thus, this cell will not give the spontaneous cell reaction with smallest

Hence, the spontaneous cell reaction having smallest is

MIDDLE SCHOOL

Which equation obeys the law of conservation of mass? A.
2C4H10 + 2Cl2 + 12O2 7CO2 + CCl4 + 10H2O
B.
C4H10+ Cl2 + 2O2 7CO2 + CCl4 + 8H2O
C.
2C4H10+ 2Cl2 + 12O2 4CO2 + CCl4 + H2O
D.
2C4H10+ 2Cl2 + 6O2 CO2 + CCl4 + 6H2O
E.
4C4H10+ 4Cl2 + 14O2 14CO2 + CCl4 + 20H2O

Answers

The answer will be a

Answer:

The correct answer for plato/edmentum is A (2C4H10 + 2Cl2 + 12O2 = 7CO2 + CCl4 + 10H2O)

:)

HIGH SCHOOL

Endothermic reactions do not obey the law of conservation of energy since they do not give off any energy A. True
B. False

Answers

Answer:

B. False

Explanation:

Hello,

In this case, we first should remember that endothermic reactions are those reactions absorbing energy while they undergo, for that reason it is false they do not give off energy. Moreover, law of conservation of energy must the respected as energy cannot be neither created nor destroyed but just changed, that is why the whole statement is false.

Best regards.

Truuuuuuueeeeeeeeeeeeeeeee
MIDDLE SCHOOL

In a certain chemical reaction, 297 g of zinc chloride was produced from the single replacement reaction of excess zinc and 202.7 g of lithium chloride. What is the percent yield of zinc chloride?

Answers

The percentage yield of zinc chloride, ZnCl₂ obtained from the reaction is 91.6%

Balanced equation

Zn + 2LiCl —> ZnCl₂ + 2Li

Molar mass of LiCl = 7 + 35.5 = 42.5 g/mol

Mass of LiCl from the balanced equation = 2 × 42.5 = 85 g

Molar mass of ZnCl₂ = 65 + (35.5×2) = 136 g/mol

Mass of ZnCl₂ from the balanced equation = 1 × 136 = 136 g

SUMMARY

From the balanced equation above,

85 g of LiCl reacted to produce 136 g of ZnCl₂

How to determine the theoretical yield of ZnCl₂

From the balanced equation above,

85 g of LiCl reacted to produce 136 g of ZnCl₂

Therefore,

202.7 g of LiCl will react to produce = (202.7 × 136) / 85 = 324.32 g of ZnCl₂

How to determine the percentage yield
  • Actual yield of ZnCl₂ = 297 g
  • Theoretical yield of ZnCl₂ = 324.32 g
  • Percentage yield =?

Percentage yield = (Actual / Theoretical) × 100

Percentage yield = (297 / 324.32) ×100

Percentage yield = 91.6%

Learn more about stoichiometry:

brainly.com/question/14735801

#SPJ2

Hey katie :

Molar mass of LiCl = 42.4 g/mol

Number of mole of LiCl = (given mass)/(molar mass)

= 202.7/42.4  => 4.78 moles of LiCl

Reaction taking place  is  :

2LiCl  +  Zn   -- >  ZnCl2   +   2Li

according to reaction :

2 mole of LiCl give 1 mole of ZnCl2

1 mole of LiCl give 1/2 mole of ZnCl2

4.78 mole of LiCl give (1/2)*4.78 mole of ZnCl2

number of mole of ZnCl2 formed = 2.39 moles

molar mass of ZnCl2 = 136.3 g/mol

mass of ZnCl2 formed = (number of moles of ZnCl2)*(molar mass)

= 2.39*136.3

= 325.8 g of ZnCl2

%yield = {(actual yiield)/(theoretical yield)}*100

= (297/325.8)*100

= 91.2 %

Answer : 91.2%

Hope that helps!

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