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irinina [24]
3 years ago
14

Which chemical property of matter describes how well things burn ?​

Chemistry
1 answer:
Mariulka [41]3 years ago
3 0
The propriety should be ‘flammability’
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A system gains 15.0 J of thermal energy and does 65.0 J of work on its surroundings.
Ivanshal [37]

Answer:

-50J

Explanation:

Q(in) - W(out) = ΔU

15 - 65 = -50

5 0
3 years ago
A sample of brass is put into a calorimeter (see sketch at right) that contains of water. The brass sample starts off at and the
Ierofanga [76]

Complete Question

The complete question is shown on the first uploaded image

Answer:

The specific heat is  c_b  = 0.402 J / g \cdot ^oC

Explanation:

From the question we are told that

    The mass of  the sample is  m = 54.4 \ g

     The mass of the water is  m_w = 150.0 \ g

     The initial temperature of the sample is  T_i  = 95.1 ^oC

     The initial temperature of the water is  T_{w_i} =  15^oC

     The final temperature of the water is  T  =  17.6 ^oC

Note the final temperature of water is equal to the final temperature of brass sample

    The pressure is  P =1 \ atm

Generally for according to the law of energy conservation

    The heat lost by sample  =  The heat gain by water

   

The heat lost by brass sample is  mathematically evaluated as    

          H_L  =  m * c_b  *  [T_i - T]

Where c_b is the specific neat of the brass sample

The heat gained  by water is  mathematically evaluated as          

        H_g  = m_w *c_w * [T_w - T ]

where c_w is the specific heat of water which has a constant value of  

     c_w =  4.186  joule/gram

So

    H_L  =  H_g \ \equiv m* c_b  * [T_i -T] =  m_w * c_w * [T - T_w]

substituting values

    52.4 * c_b  * [95.1  - 17.6] =  150 * 4.186 * [ 17.6 - 15.0]

    c_b  = 0.402 J / g \cdot ^oC

4 0
4 years ago
Whenever you heat liquids, especially near their boiling point, you should always use a stir bar or boiling stones. Why is this?
bogdanovich [222]

Answer:

Boiling stones and stir bars serve to help the liquid to boil more calmly <em>avoiding it to become superheated or bumping and with this preventing accidents, projection of dangerous liquids or burns.</em>

I hope you find this information useful and interesting! Good luck!

4 0
3 years ago
What happens to the atomic radius of elements as you move from left to right across a period?​
Katyanochek1 [597]

Explanation:

Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons.

4 0
3 years ago
What is an example of thermal energy
Yuliya22 [10]
D because your using heat I’m guessing
6 0
2 years ago
Read 2 more answers
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