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Nana76 [90]
3 years ago
9

Pls help will give points

Chemistry
1 answer:
Anettt [7]3 years ago
6 0

Answer:

i don't think anyone is going to be able to answer every single one of those

Explanation:

;-;

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Please help and show all your work step by step
g100num [7]

Answer:

45 gms

Explanation:

Refer to attachment.

<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em> </em><em>:</em><em>)</em>

4 0
3 years ago
How is protenin in milk broken down in our digestive system​
aliina [53]

Answer:

when we drink the milk the digestive system produce protease enzyme to break down the protein of milk.

7 0
3 years ago
Which is one way to determine whether a reaction was a chemical reaction or a nuclear reaction?
svetoff [14.1K]
<h2>Answer:</h2>

B) check to see if any energy was released during the reaction

<h3>Explanation:</h3>

Energy changes accompanying nuclear reactions are much larger. This energy comes from the destruction of mass. In a nuclear reaction, mass is not strictly conserved. Some of the mass is converted into energy, according to the equation E = mc2 and the order of energy evolved during a nuclear reaction is much higher than that of a chemical reaction. So, one of the significant way to determine weather the reaction is chemical or nuclear is to check how much energy was released during the reaction.

5 0
3 years ago
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What are the three key things in science?
stiv31 [10]

Answer:

The three key things in Science are:

Physical Science,Earth Science and Life Science

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5 0
3 years ago
The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2CrO3(s) + 3Si(s)----&gt; 4Cr(l) + 3SiO2
nalin [4]

Answer: 51.45 grams of excess reagent is left after the completion of reaction.

Explanation: For the calculation of moles, we use the formula:

Moles=\frac{\text{Given mass}}{\text{Molar mass}}     ....(1)

  • For Si

Given mass = 92 grams

Molar mass = 28g/mol

Putting values in equation 1, we get:

Moles=\frac{92g}{28g/mol}=3.285moles

  • For Cr_2O_3

Given mass = 112 grams

Molar mass = 116g/mol

Putting values in equation 1, we get:

Moles=\frac{112g}{116g/mol}=0.965moles

The reaction follows:

2Cr_2O_3(s)+3Si(s)\rightarrow 4Cr(l)+3SiO_2(s)

By Stoichiometry,

2 moles of Cr_2O_3 reacts with 3 moles of silicon

So, 0.965 moles of Cr_2O_3 reacts with = \frac{3}{2}\times 0.965 = 1.4475 moles of Silicon.

As, the moles of silicon is more than the required amount and is present in excess.

So, the excess reagent for the reaction is Silicon.

Moles of silicon remained after reaction = 3.285 - 1.4475 = 1.8375 moles

To calculate the amount of Silicon left in excess is calculated by using equation 1:

1.8375=\frac{\text{Given mass}}{28}

Amount of Silicon in excess will be 51.45 grams.

5 0
4 years ago
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