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jasenka [17]
3 years ago
10

Which tool was most likely used in a procedure if the lab report shows that approximately 300ml of water was used

Chemistry
1 answer:
SVETLANKA909090 [29]3 years ago
3 0
A graduated cylinder was used.
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A wooden block has a volume of 25.3 cm3. Its mass is 17.0g. What is the density of this block?
kolbaska11 [484]
Density = (mass) / (volume)

Density = (17.0 g) / (25.3 cm³) = 0.672 gm per cm³. (rounded)
6 0
3 years ago
Give two reasons why mixing and heating sulphur powder and iron filings on a watch glass is chemical change
Nadusha1986 [10]

Answer:

When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S. Therefore, heating of mixture of iron and sulphur powder is a chemical change.

7 0
3 years ago
Which compound in each pair is more soluble in water?(a) Magnesium hydroxide or nickel(II) hydroxide
Alexxandr [17]

What is called compound?

  • In chemistry, a compound is a substance made up of two or more different chemical elements combined in a fixed ratio.
  • When the elements come together, they react with each other and form chemical bonds that are difficult to break.
  • These bonds form as a result of sharing or exchanging electrons between atoms.

a) Mg(OH)2 or Ni(OH)2.

Mg(OH)2 1.8×10–11

Ni(OH)2 2.0×10–15

Clearly, Ksp value for Mg(OH)2 is higher , meaning it is MUCH MORE SOLBULE than Nickel

therefore, choose Mg(OH)2.

b)

PbS 3×10–28

CuS 6×10–37

Clearly, PbS is much more soluble than CuS

since Ksp is higher .

c)

Ag2SO4 1.4×10–5

MgF2 3.7×10–8

Clearly, Ag2SO4 has higher Ksp, so it is much more soluble.

Learn more about compound

brainly.com/question/13516179

#SPJ4

6 0
2 years ago
What is the maximum number of grams of N-acetyl-p-toluidine can be prepared from 70. milliliters of 0.167 M p-toluidine hydrochl
Genrish500 [490]

<u>Answer:</u> The maximum amount of N-acetyl-p-toluidine that can be prepared is 1.7 grams.

<u>Explanation:</u>

To calculate the number of moles for given molarity, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}

Molarity of p-toluidine hydrochloride solution = 0.167 M

Volume of solution = 70. mL

Putting values in above equation, we get:

0.167M=\frac{\text{Moles of p-toluidine hydrochloride}\times 1000}{70}\\\\\text{Moles of p-toluidine hydrochloride}=\frac{0.167\times 70}{1000}=0.0117mol

The chemical equation for the reaction of p-toluidine hydrochloride and acetic anhydride follows:

\text{p-toluidine hydrochloride}+\text{Acetic anhydride}\rightarrow \text{N-acetyl-p-toluidine}

By Stoichiometry of the reaction:

1 mole of p-toluidine hydrochloride produces 1 mole of N-acetyl-p-toluidine

So, 0.0117 moles of p-toluidine hydrochloride will produce = \frac{1}{1}\times 0.0117=0.0117mol of N-acetyl-p-toluidine

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Molar mass of N-acetyl-p-toluidine = 149.2 g/mol

Moles of N-acetyl-p-toluidine = 0.0117 moles

Putting values in equation 1, we get:

0.0117mol=\frac{\text{Mass of N-acetyl-p-toluidine}}{149.2g/mol}\\\\\text{Mass of N-acetyl-p-toluidine}=(0.0117g/mol\times 149.2)=1.7g

Hence, the maximum amount of N-acetyl-p-toluidine that can be prepared is 1.7 grams.

6 0
3 years ago
The reaction, 2 SO3(g) &lt;--&gt; 2 SO2(g) + O2(g) is endothermic. Predict what will happen if the tem­perature is increased.
baherus [9]

Explanation:

This reaction is in equilibrium and would hence obey lechatelier's principle. This principle states that whenever a system at equilibrium undergoes a change, it would react in way so as to annul that change.

Since it is an endothermic reaction, increasing the temperature would cause the reaction to shift towards the right.

This means that it favours product formation and more of the product would be formed.

8 0
3 years ago
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