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ohaa [14]
3 years ago
5

Using your knowledge of properties of matter, choose the correct description: Question 3 options: physical prop. are luster, col

or & reactivity Chemical prop. are conductivity, flammability & reactivity Chemical prop. are tarnishing, flammability & reactivity physcial prop are malleability, conductivity & rusting
Chemistry
1 answer:
MrRissso [65]3 years ago
3 0

Based on the knowledge of properties of matter, Chemical prop. are tarnishing, flammability & reactivity.

In Chemistry, matter can be defined as anything that has mass and occupies space. Any physical object that is found on earth is typically composed of matter.

Basically, matter are known to be made up of atoms and as a result has the property of existing in states;

  • Solid.
  • Liquid.
  • Gas.

A chemical change gives rise to the chemical properties of matter and it is typically characterized by a change in chemical composition and the formation of a new substance.

In this context, we can deduce that the chemical properties of matter are;

  • Tarnishing.
  • Flammability.
  • Reactivity.

Find more information: brainly.com/question/23529643

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A 5.000 g mixture contains strontium nitrate and potassium bromide. Excess lead(II) nitrate solution is added to precipitate out
scZoUnD [109]

<u>Answer:</u> The mass percent of potassium bromide in the mixture is 9.996%

<u>Explanation:</u>

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

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}     .....(1)

<u>For lead (II) bromide:</u>

Given mass of lead (II) bromide = 0.7822 g

Molar mass of lead (II) bromide = 367 g/mol

Putting values in equation 1, we get:

\text{Moles of lead (II) bromide}=\frac{0.7822g}{367g/mol}=0.0021mol

  • The chemical equation for the reaction of lead (II) nitrate and potassium bromide follows:

2KBr+Pb(NO_3)_2\rightarrow PbBr_2+2KNO_3

By Stoichiometry of the reaction:

1 mole of lead (II) bromide is produced from 2 moles of potassium bromide

So, 0.0021 moles of lead (II) bromide will be produced from = \frac{2}{1}\times 0.0021=0.0042mol of potassium bromide

  • Now, calculating the mass of potassium bromide by using equation 1, we get:

Molar mass of KBr = 119 g/mol

Moles of KBr = 0.0042 moles

Putting values in equation 1, we get:

0.0042mol=\frac{\text{Mass of KBr}}{119g/mol}\\\\\text{Mass of KBr}=0.4998g

  • To calculate the percentage composition of KBr in the mixture, we use the equation:

\%\text{ composition of KBr}=\frac{\text{Mass of KBr}}{\text{Mass of mixture}}\times 100

Mass of mixture = 5.000 g

Mass of KBr = 0.4998 g

Putting values in above equation, we get:

\%\text{ composition of KBr}=\frac{0.4998g}{5.000g}\times 100=9.996\%

Hence, the percent by mass of KBr in the mixture is 9.996 %

5 0
3 years ago
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Mars2501 [29]

Are spotted cats cuter than solid-colored cats?

4 0
3 years ago
Describe what occurs when a gas is collected by water displacement, including why a table of water vapor pressure values is need
Radda [10]

When a gas bubbles through water, small droplets of water are usually picked up along for the ride and are mixed in with the gas above the water inside the eudiometer tube. The water vapor takes up room, but isn't the important gas that you need to measure. The table of water vapor is needed to subtract the unwanted water vapor from the collection of gases.

5 0
3 years ago
How do catalysts increase the rate of a chemical reaction?
bogdanovich [222]
A, They Lower The Activation Energy.
7 0
3 years ago
Read 2 more answers
Bromine, a liquid at room temperature has a boiling point of 58 degrees celsius and a melting point at -7.2 degree celsius bromi
ra1l [238]

Hello!


Bromine can be classified as a pure substance.


Why?


Bromine is an element with atomic number 35 on group 17 of the Periodic Table. That's the first sign that shows us that it is a pure substance.


But the fact that it has a clear and defined boiling and melting point is a sign that we are in the presence of a pure substance. Pure substances are characterized by defined boiling and melting points.


Mixtures usually have a range of temperatures in which they melt and boil.


Have a nice day!

8 0
3 years ago
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