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cupoosta [38]
3 years ago
8

The emission spectrum for an element is? Select all that apply

Chemistry
1 answer:
lesya [120]3 years ago
4 0

Answer:  You didn't give anything to select, however, the emission spectrum of a chemical element is frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state.

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To the nearest whole number how many moles are in 130 g sample of calcium metal?
lesantik [10]
To convert grams to moles, we need the molar mass of the element or compound. remember you can determine the molar mass of a molecule by adding the atomic mass of each atom from the periodic table.

molar mass of Na= 23.0 g/ mol

130 g (1 mol Na/ 23.0 grams)= 5.65 moles or 6 moles.
6 0
3 years ago
If 60.0 grams of carbonic acid are sealed in a 2.00 L soda bottle at room temperature (298 K) and decompose completely via the e
Tresset [83]

Answer:

The final pressure of the carbon dioxide gas will 11.84 atm.

Explanation:

Moles of carbonic acid = \frac{60.0 g}{62 g/mol}=0.9677 mol

H_2CO_3(aq)\rightarrow H_2O(l) + CO_2(g)

According to reaction, 1 mol of carbonic acid gives 1 mole of carbon dioxide gas.

Then 0.9677 moles of carbonic acid will give :

\frac{1}{1}\times 0.9677 mol=0.09677 mol of carbon dioxide

Moles of carbon dioxide gas = n = 0.09677 mol

Volume of soda bottle = V_1=2 L

Pressure of the carbon dioxide gas = P

Temperature of the carbon dioxide gas = T = 298 K

PV=nRT (ideal gas law)

P=\frac{nRT}{V}=\frac{0.9677 mol\times 0.0821 atm L/mol K\times 298 K}{2 L}=11.84 atm

The final pressure of the carbon dioxide gas will 11.84 atm.

6 0
3 years ago
Neutrons are very important to an atom's ________<br> properties
solniwko [45]

Answer:

Intrinsic properties

Explanation:

Neutron affects the mass of an atom and intrinsic properties depend on the mass of the substance

7 0
2 years ago
Generally how does the first ionization energy vary as the atomic number increases going across a period
Vlad1618 [11]

Across a period I.E increases progressively from left to right

Explanation:

The trend of the first ionization energy is such that across a period I.E increases from left to right due to the decreasing  atomic radii caused by the increasing nuclear charge. This not compensated for by successive electronic shells.

  • Ionization energy is a measure of the readiness of an atom to lose an electron.
  • The lower the value, the easier it is for an atom to lose an electron.
  • Elements in group I tend to lose their electrons more readily whereas the halogens hold most tightly to them.
  • The first ionization energy is the energy needed to remove the most loosely bonded electron of an atom in the gaseous phase.

Learn more:

Ionization energy brainly.com/question/6324347

#learnwithBrainly

3 0
4 years ago
The worst feeling is when you are hurting so badly inside but not a single tear comes out.
guapka [62]

Answer:

chemistry wow

Explanation:

8 0
3 years ago
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