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devlian [24]
3 years ago
11

Which properties can be measured without changing the chemical composition of the matter? _______ properties can be measured wit

hout changing the chemical composition of the matter.
Chemistry
2 answers:
ArbitrLikvidat [17]3 years ago
4 0

Answer:

Physical Properties! :)

Explanation:

evablogger [386]3 years ago
3 0

Answer:

\boxed {\sf Physical}

Explanation:

There are two main kinds of properties: chemical and physical.

Chemical properties, like the name suggests, have to be observed by changing the chemical composition.

That leaves <u>physical properties.</u> They can be measured without any chemical composition changes.

Some examples include: color, odor, mass, density, and volume. All can be measured with just the senses or measuring tools and no composition alterations are needed.

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at do oxygen (O) and bromine (Br) have in common? They both tend to gain electrons to gain stability. They both have seven valen
avanturin [10]
Both of them have high electronegativity. Hence they both tend to gain electrons to gain stability.
4 0
3 years ago
After each half-life cycle, of the radioactive nuclei became nonradioactive.
kherson [118]

Answer:

half

Explanation:

i just took the quiz

7 0
3 years ago
The theoretical yield of Cl2 from certain starting amounts of MnO2 and HCl was calculated as 60.25 g and 65.02 g, respectively.
user100 [1]

Answer:

c    43.38 g

Explanation:

The reaction  between MnO2 and HCl can be represented by the following balanced equation:

MnO2 + HCl ---> Cl2 + MnCl2 + H2O

From the balanced equation, the theoretically required molar ratio of MnO2 to HCl is 1:1, therefore the yields would have been expected to be equal.  

For the fact that HCl  gives a higher yield (65.02g) than MnO2 (60.25g) according to the problem statement, HCl should be in excess,  while the limiting reagent should be MnO2 .  

Thus, the theoretical yield of Cl2 will be  60.25 g.

By definition, the percentage yield is given by

% Yield = (Actual Yield) / (Theoretical Yield),  

This can be simplified to

Actual Yield = % Yield * Theoretical Yield

Plugging in the given values we have

Actual Yield = 72% *  60.25 = 43.38 g

5 0
3 years ago
1. For every 5.00 mL of milk of magnesia there are 400. mg of magnesium hydroxide. How many mL of milk of magnesia do we need to
forsale [732]

Answer:

1. 6.50mL

2. pH = 13.097

Explanation:

1. The neutralization of HCl with Al(OH)₃ is:

3HCl + Al(OH)₃ → Al(Cl)₃ + 3H₂O

40.0mL ≡ 0.0400L of 0.500M HCl are:

0.0400L × (0.500mol / L) = <em><u>0.0200 moles of HCl</u></em>

Based on the neutralization, 3 moles of HCl react with 1 mole of Al(OH)₃, thus, the moles of Al(OH)₃ that react with 0.0200 mol of HCl are:

0.0200mol HCl × (1mol Al(OH)₃ / 3mol HCl) = <em><u>0.00667 moles of Al(OH)₃</u></em>. In grams:

0.00667 moles Al(OH)₃ × (78g / 1mol) = 0.520g of Al(OH)₃ ≡ 520mg

As 5.00mL of milk magnesia contain 400mg of Al(OH)₃, the mL of milk magnesia required for a complete reaction are:

520 mg Al(OH)₃ × (5.00mL / 400mg) =<em> 6.50mL</em>

<em />

2. The reaction of lithium hydroxide (LiOH) with perchloric acid (HClO₄) is:

HClO₄ + LiOH → LiClO₄ + H₂O

<em>The reaction is 1:1.</em>

Moles of LiOH and HClO₄ are:

LiOH: 0.0500L × (0.350mol / L) = <em>0.0175 moles of LiOH</em>

HClO₄: 0.0300L × (0.250mol / L) = <em>0.0075 moles of HClO₄</em>

Assuming the reaction goes to completion, moles of LiOH that remains are:

0.0175 mol - 0.0075 mol = 0.0100 moles of LiOH. The total volume is 80.0mL, 0.0800L. Thus, molarity of LiOH is:

0.0100 mol / 0.0800L = <em>0.125 M of LiOH</em>

It is possible to obtain the pOH of the solution thus:

pOH = -log (OH) = -log 0.125M = 0.903

As pH = 14- pOH,

pH = 14 - 0.903 = <em>13.097</em>

I hope it helps!

3 0
3 years ago
Find the opposite words from the text a.Fold b. noisy c. uncertainly​
vlabodo [156]

Answer:

a.Fold × unfold

b. noisy × peaceful

c. uncertainly × certainly

5 0
2 years ago
Read 2 more answers
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