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DanielleElmas [232]
3 years ago
14

Enter the atomic symbols for an isotope with four protons and five neutrons

Chemistry
1 answer:
MArishka [77]3 years ago
4 0
The atomic symbol for an isotope with 4 protons and 5 neutrons is Beryllium ( Be)................
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A gas at 29.4 kPa is cooled from a temperature of 75°C to a temperature of 25°C at constant volume. What is the new pressure of
kirill115 [55]

<span>To solve this we assume that the gas inside the balloon is an ideal </span>gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant volume pressure and number of moles of the gas the ratio of T and P is equal to some constant. At another set of condition, the constant is still the same. Calculations are as follows:

 

T1/P1 = T2/P2

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P2 = 25 x 29.4 / 75

P2 = 9.8 kPa

7 0
3 years ago
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Consider the balanced chemical equation for the combustion of methane (CH4).
Mrac [35]
<h3>Answer:</h3>

                  89.6 L of O₂

<h3>Solution:</h3>

The balanced chemical equation is as,

                                CH₄  +  2 O₂    →    CO₂  +  2 H₂O

As at STP, one mole of any gas (Ideal gas) occupies exactly 22.4 L of Volume. Therefore, According to equation,

             44 g ( 1 mol) CO₂ is produced by  =  44.8 L (2 mol) of O₂

So,

                  88 g CO₂ will be produced by  = X L of O₂

Solving for X,

                        X = (88 g × 44.8 L) ÷ 44 g

                        X = 89.6 L of O₂

5 0
3 years ago
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Which type of energy is associated with random motion of atoms and molecules in a sample of air?
aleksandrvk [35]

The answer is thermal energy
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3 A specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state.
Masja [62]
When a specific amount of energy is emitted when excited electrons in an atom in a sample of an element return to the ground state, this emitted energy can
<span>be used to determine the "identity of the element".</span>
5 0
3 years ago
5. __NH3 + __O2 &gt;&gt;&gt;&gt;&gt;__ NO +__ H20
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2 NH3+ 2 O2 —> 2 NO+ 3 H2O
5 0
3 years ago
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