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Tom [10]
2 years ago
5

Wich of the following is not a necessary step to take before conducting an experiment

Biology
1 answer:
zhenek [66]2 years ago
7 0

Answer: A

Explanation: There is no need to conduct and experiment if you already know the answer

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What will be the theoretcal yield of tungsten(s) ,W, if 45.0 g of WO3 combines as completely as possible with 1.50 g of H2? WO3(
7nadin3 [17]

Answer:

Theoretical yield of tungsten produced = 35.6836915592  ≈ 35. 68 g

Explanation:

The chemical equation can be expressed as follows;

WO3 (s) + 3H2(g) → W(s) + 3 H20(g)

Note that the equation is already balanced.

Molecular Mass of WO3= 183.84 + 15.999 × 3 = 183.84 + 47.997  = 231.837 g

From the equation 1 mole of WO3 reacts with 3 mole of hydrogen molecule.

Molecular mass of tungsten(W) = 183.84 g

1 mole of tungsten was produced from the chemical equation.

WO3 (s) + 3H2(g) → W(s) + 3 H20(g)

From the equation,

231. 837 g of WO3 produces 183.84 g of tungsten

45.0 g of WO3 will produce ?

grams of tungsten produced = 183.84 × 45 /231.837

grams of tungsten produced = 8272.8 /231.837

Theoretical yield of tungsten produced = 35.6836915592  ≈ 35. 68 g

 

7 0
3 years ago
What is the partially shaded outer region of shadow cast by the earth or moon called?
Neporo4naja [7]

Answer:

Penumbra I believe

8 0
2 years ago
Read 2 more answers
Microbial proteins with a strong specificity for a target cell that exert extremely powerful, and sometimes deadly, effects on t
Slav-nsk [51]

Toxins are microbial proteins with a strong specificity for a target cell that exert extremely powerful and toxic effects on that cell.

<h3>What are toxins?</h3>

Toxins are molecules that are produced by certain organisms which are deadly to other organisms when these organisms come in contact with them.

Toxins are produces mostly by microorganisms as well as some plants and animals such as fishes.

Toxins are mostly proteins products are usually specific for their targets cells.

Therefore, microbial proteins with a strong specificity for a target cell that exert extremely powerful, and sometimes deadly, effects on that cell are called toxins.

Learn more about toxins at: brainly.com/question/1235358

6 0
3 years ago
A P E X
dolphi86 [110]

Answer:

osbervaison and information

Explanation:

you can osbrve if a person ahs a healthy life stlye and see what they need and what they dont need information you can ask that person for more depth on what happended why they are like that what caused them to be that way if it s good or bad

if someone is coghing and you can obersev and tell that they are sick and if you ask what happedn they will tell you information then you can tell what type of cold they have. HOPES THIS HELPS IF IT DOSE THE GIVE ME AN BRAINLIEST PLS I NEVER HAD ONE.❤

8 0
2 years ago
In subduction zones, dense pieces of oceanic crust are pulled downward toward the mantle. What is the result of this?
Elodia [21]
New crust is formed on the opposite end of the plate as it pulled away from. 
6 0
3 years ago
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