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Kobotan [32]
3 years ago
12

Calculate the volume of a sample of iron that has a density of 6.8 g/mL and a mass of 6780 mg.

Chemistry
1 answer:
Veronika [31]3 years ago
8 0

Answer:

m= 6780mg = 6.78g = 6.8g

d= 6.8g/ml

V= m/d

V= 1ml

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Distinguish between an absorption spectrum and an emission spectrum. With which did Bohr work?
Marianna [84]

Answer:

Bohr used emission spectrum for its mono atomic model....

Explanation:

Emission Spectrum is produced when atoms are excited by energy. After excitation, they emit this energy in the form of different wavelengths according to the type of atom and produce a unique fingerprint of themselves called as it's emission spectrum.

Absorption Spectrum is a type of spectrum that is produces when photons of light are absorbed by electrons at one state. they jump to another state and may cause scattering. This produces a specific absorption spectrum for that specific atom.

4 0
3 years ago
oxygen is a common oxidizing agent in nature. what change in the oxidation number of oxygen must occur if it is to be an oxidizi
Minchanka [31]

Answer is: the oxidation number of oxygen must decrease.

Oxidizing agent is element (substance) that gain electrons in chemical reaction.

For example, balanced chemical reaction: C + O₂ → CO₂.

Oxygen change oxidation number from 0 to oxidation number -2 (reduction) and carbon change from 0 to +4 (oxidation)

6 0
3 years ago
An element's atomic number is 62. How many electrons would an atom of this element have?
mylen [45]

it has 62 electrons because science


8 0
3 years ago
When this element was discovered, it exhibited luster and malleability, and it reacted very vigorously with water. This element
TEA [102]

Answer:

a) alkali metals

Explanation:

The element described above definitely belonged to the alkali metals, the first group on the periodic table. They show the properties indicated in the text.

  • They are metals because only metals are lustrous and malleable. This eliminates the possibility of them being halogens and noble gases.
  • Only group 1 metals reacts vigorously with water to form alkali.
  • Alkali are aqueous solutions that are basic in nature.
  • The reactivity of group 1 metals is due to their one extra electrons in the outer most shell.
  • These electrons are easily and readily lost in order for such atoms to gain stability and replicate the nearest noble gases.
  • The most reactive metal belongs to this group elements.
  • This is why it is nearly impossible to find them occurring alone in free state.
  • Some of the elements in this group are Li, Na, K, Rb, Cs and Fr.
  • Transition metals have variable oxidation states and some can be found alone in nature.
8 0
3 years ago
A glass container was initially charged with 1.95 moles of a gas sample at 3.75 atm and 21.7 °C. Some of the gas was released as
rjkz [21]

Answer:

45830.4 moles

Explanation:

Ideal gas law is the hypothetical equation in which the pressure, volume, and temperature of the gas are directly related. It can be denoted as:

PV = nRT

The ideal gas law is:

PV = nRT

where,

P = Pressure

V = Volume

R = Gas constant

T =Temperature

n = moles

Given:

Moles in container = 1.95

Temperture = 294.85 K

Pressure = 3.75 atm

Volume =?

Substituting the values:

V = nRT/P

V = 1.95 × 0.082 × 294 / 3.75

Volume = 12.5 L

Now, the condition when changed, such that temperature is 301.25 K, pressure is 0.998 atm, and Volume is 12.5 L, then moles will be equal to:

PV/RT = n

0.998 × 12.5 / 0.082 × 301.25 = n

n = 45830.4 moles

Therefore, 0.521 moles is still present in the container.

To know more about ideal gas law, refer to the following link:

brainly.com/question/12124605

5 0
2 years ago
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