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vredina [299]
3 years ago
5

Please help will give brainliest

Chemistry
1 answer:
snow_lady [41]3 years ago
5 0

Answer:

1st one is...

Explanation:

The 1st one is change in size or shape. 2nd one is formation of precipitate. 3rd one is physical change. 4th one is formation of gas.

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A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 6
blondinia [14]
Specific heat is the amount of heat absorb or released by a substance to change the temperature to one degree Celsius. To determine the specific heat, we use the expression for the heat absorbed by the system. Heat gained or absorbed in a system can be calculated by multiplying the given mass to the specific heat capacity of the substance and the temperature difference. It is expressed as follows:

Heat = mC(T2-T1)

By substituting the given values, we can calculate for C which is the specific heat of the material.

2510 J = .158 kg ( 1000 g / 1 kg) (C) ( 61.0 - 32.0 °C)
C = 0.5478 J / g °C
6 0
3 years ago
Draw the product formed when the following diene is treated with one equivalent of HCl. Do not show stereochemistry in your answ
garri49 [273]

Answer:

4-chloro-4-methyl-cyclohexene.

Explanation:

Hello,

On the attached picture you will find the chemical reaction forming the required product, 4-chloro-4-methyl-cyclohexene. In this case, according to the Markovnicov’s rule, it is more likely for the chlorine to be substituted at the carbon containing the methyl radical in addition to the hydrogen to the next carbon to break the double bond and yield the presented product.

Best regards.

6 0
3 years ago
Why does electronegativity increase as you move through a period on the periodic table?
velikii [3]

Answer:the size of the atom increases is your answer have a great day

Explanation:

5 0
3 years ago
Among important crop plants, nitrogen-fixing root nodules are most commonly an attribute of A) corn. B) legumes. C) wheat. D) me
7nadin3 [17]
<span>Among important crop plants, nitrogen-fixing root nodules are most commonly an attribute of
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3 0
3 years ago
What is the percent by mass of C in benzene (C6H6)? The molecular weight of carbon is 12.0107 g/mol and of hydrogen 1.00794 g/mo
pshichka [43]

Answer:

92.26% of C

Explanation:

To solve this problem we must assume we have 1 mole of benzene. The mole contains 6 moles of C and 6 moles of H. We have to convert these moles to grams in order to find the total mass and mass percent will be:

Mass atom / Total mass * 100

<em>Mass C: </em>6mol C * (12.0107g / mol) = 72.0642g

<em>Mass H: </em>6mol H * (1.00794g / mol) = 6.04764g

<em>total mass: </em>72.0642g + 6.04764g = 78.11184g

Mass percent of C will be:

72.0642g C / 78.11184g* 100

<h3>92.26% of C</h3>

3 0
3 years ago
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