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GaryK [48]
4 years ago
15

The atomic number of magnesium (Mg) is 12. This is also the number of which of the following?

Chemistry
2 answers:
statuscvo [17]4 years ago
8 0
Protons and electrons
ArbitrLikvidat [17]4 years ago
5 0
It's also the number of protons & electrons.
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A 31.5 g wafer of pure gold initially at 69.4 ∘C is submerged into 63.4 g of water at 27.4 ∘C in an insulated container.
liubo4ka [24]

Answer: The final temperature of both substances at thermal equilibrium is 301.0 K

Explanation:

heat_{absorbed}=heat_{released}

As we know that,  

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]         .................(1)

where,

q = heat absorbed or released

m_1 = mass of gold = 31.5 g

m_2 = mass of water = 63.4 g

T_{final} = final temperature = ?

T_1 = temperature of gold = 69.4^oC=342.4K

T_2 = temperature of water = 27.4^oC=300.4K

c_1 = specific heat of gold = 0.129J/g^0C

c_2 = specific heat of water= 4.184J/g^0C

Now put all the given values in equation (1), we get

-31.5\times 0.129\times (T_{final}-342.4)=[63.4\times 4.184\times (T_{final}-300.4)]

T_{final}=301.0K

The final temperature of both substances at thermal equilibrium is 301.0 K

4 0
4 years ago
What is the name of the molecule below
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a solid form of precipitation that forms when water droplets in a cloud get very cold and collide with other super cold water dr
Daniel [21]

Answer:

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Explanation:

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When particles collide, they transfer .
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When particles collide, they transfer fro their thermal energy.

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An atom of sulfur is represented by 3316s. how many neutrons are in the nucleus of this atom?express your answer as an integer.
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In this question, the sulfur atom has atomic number 16 and atomic mass 33. The Atomic number represents the number of the proton inside the atoms and atomic mass represent the mass of the atoms. Since electron mass to small, the atomic mass can be interpreted as the sum of neutron and proton. Then, the number of the neutron would be:

mass= neutron + proton
33= neutron+16
neutron = 17
5 0
3 years ago
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