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Tanzania [10]
3 years ago
12

Help me please

Chemistry
1 answer:
Serhud [2]3 years ago
8 0

1.what is an atomic model ?

= <em>A </em><em>smallest</em><em> </em><em>particle </em><em>of</em><em> </em><em>an </em><em>element</em><em> </em><em>that</em><em> </em><em>can</em><em> </em><em>take</em><em> </em><em>part</em><em> </em><em>in</em><em> </em><em>chemical</em><em> </em><em>reaction</em><em> </em><em>without</em><em> </em><em>division</em><em> </em><em> </em><em>is</em><em> </em><em><u>known</u></em><em><u> </u></em><em><u>as</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>model</u></em><em><u> </u></em><em><u>.</u></em>

<em>2</em><em>.</em><em> </em>What is called atomic number and mass number?

=<em>The</em><em> </em><em>total</em><em> </em><em>number</em><em> </em><em>of </em><em>protons</em><em> </em><em>present</em><em> </em><em>in</em><em> </em><em>the</em><em> </em><em><u>nucleus</u></em><em><u> </u></em><em><u>of </u></em><em><u>an</u></em><em><u> </u></em><em><u>atom</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>known</u></em><em><u> </u></em><em><u>as</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>.</u></em>

<em><u>=</u></em><em><u>The</u></em><em><u> </u></em><em><u>mass</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>an</u></em><em><u> </u></em><em><u>atomic</u></em><em><u> </u></em><em><u>number</u></em><em><u> </u></em><em><u>is</u></em><em><u> </u></em><em><u>amu</u></em><em><u>.</u></em>

3. What is called an element?

=<em><u>An </u></em><em><u>element </u></em><em><u>is </u></em><em><u>the</u></em><em><u> </u></em><em><u>simplest</u></em><em><u> </u></em><em><u>pure</u></em><em><u> </u></em><em><u>form</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>a </u></em><em><u>substance</u></em><em><u> </u></em><em><u>which</u></em><em><u> </u></em><em><u>cannot</u></em><em><u> </u></em><em><u>be</u></em><em><u> </u></em><em><u>split</u></em><em><u> </u></em><em><u>up</u></em><em><u> </u></em><em><u>into</u></em><em><u> </u></em><em><u>other</u></em><em><u> </u></em><em><u>simpler</u></em><em><u> </u></em><em><u>substance</u></em><em><u> </u></em><em><u>by</u></em><em><u> </u></em><em><u>any</u></em><em><u> </u></em><em><u>chemical</u></em><em><u> </u></em><em><u>method.</u></em>

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7 0
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6 0
3 years ago
How much energy is required to raise the temperature of a 300.0
Montano1993 [528]

Answer:

Q = 1455.12 Joules.

Explanation:

Given the following data;

Mass = 300 grams

Initial temperature = 22.3

Final temperature = 59.9°C

Specific heat capacity = 0.129 J/gºC.

To find the quantity of energy;

Q = mcdt

Where,

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m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

dt represents the change in temperature.

dt = T2 - T1

dt = 59.9 - 22.3

dt = 37.6°C

Substituting the values into the equation, we have;

Q = 300*0.129*37.6

Q = 1455.12 Joules.

8 0
3 years ago
What is the mass, in grams, 6.5 mol of sodium nitrate (nano3)? please show all work?
ladessa [460]
Mass is the property of a physical body and the resistance to acceleration when a net force is applied on the body.  
The atomic mass of sodium (Na) is = 22.98 
The atomic mass of nitrate (N) is = 14.00 
The atomic mass of oxygen (O) is = 15.99  
The sodium nitrate (NaNO3) consists of the atomic masses of Na+N+(O)3 = 85 grams  
Therefore, the mass of 6.5 mol of sodium nitrate is = 6.5 * 1 mol of NaNO3 
 = 6.5 * (85) 
 = 552.50 grams
6 0
3 years ago
Read 2 more answers
Question 24 (1 point)
aleksley [76]

Answer:

Explanation:

Idk

4 0
3 years ago
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