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Diano4ka-milaya [45]
4 years ago
12

A student was asked to separate a mixture of chemicals. The weight of each component within the mixture is as follows: potassium

bromide 2.53g and 0.760g barium sulfate. What is the percentage of barium sulfate within the mixture?
Chemistry
1 answer:
hram777 [196]4 years ago
6 0

Answer:

a

Explanation:

f

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Question 7 (Essay Worth 5 points)
Lubov Fominskaja [6]

The periodic table of elements is divided into columns and rows. The vertical columns represent the groups while the horizontal rows represent the periods. A group of elements usually have similar physical and chemical properties. The first column of the periodic table is made up of 7 elements including SODIUM.

1. The name of the element chosen is sodium and its chemical symbol is Na.

2. Sodium is a metal and thus it has metallic properties.

3. Sodium belongs to group one elements whose family name is ALKALI METALS.

4. The neutral atom of sodium is made up of 11 protons, 11 electrons and 12 neutrons.

5 0
3 years ago
Read 2 more answers
An aluminum engine block requires 8669 kJ of energy for the temperature to rise from 75.0 °F to 195 °F. The specific heat of lea
quester [9]

Answer:

The answer to your question is 144 kg

Explanation:

Data

Q = 8669 kJ

T1 = 75°F

T2 = 195°F

Cp = 0.897 J/(g°C)

m = ?

Formula

           Q = mCp(T2 - T1)

Process

1.- Convert temperature to °C

T1 = (75 - 32) / 1.8

   = 43/1.8

   = 23.9°C

T2 = (195 - 32) / 1.8

     = 163/1.8

     = 90.6°C

2.- Solve for m

            m = Q / Cp(T2 - T1)

3.- Substitution

            m = 8669000 / 0.897(90.6 - 23.9)

4.- Simplification

            m = 8669000 / 59.83

5.- Result

            m = 144893.66 g or 144.9 kg

6 0
3 years ago
One or more substances changing into one or more substances is an example of a
lana [24]

Hello There!

This is called a "Chemical Change"

A chemical change is when the composition of a substance changes. There are many signs of chemical changes. When a chemical change occurs, you can see a change in color. When a new color is visible that means that a new substance has been created. There also is a new smell "odor" this hints that a new substance has been formed.

6 0
3 years ago
The following is an example of what type of chemical reaction?
Oksanka [162]
The answer is d: Combustion, because it is the so-called combustion of methan. (Check your lesson)
7 0
3 years ago
Consider the reaction below.
Luba_88 [7]
Hey there!

I attached a screenshot of my chemistry notes from this year on equilibrium constants in particular. Feel free to reference this in the future if you wish. 

Based on the information in my attachment, you could construct your constant like this:

K_{eq} =  \frac{[CaO][CO_{2}]}{[CaCO_{3}]}

I don't think it matters which order your reactants or products are in as long as you have them on the top and bottom where they need to be, so your answer will be B. 

Hope this helped you out! :-)

4 0
3 years ago
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