Which group on the periodic table contains elements in all 3 states of matter?

2A → B + C The above reaction is run and it is found that a plot of the natural log of the concentration versus time is linear.

Alex17521 [72]

Answer:

zero order reaction

Explanation:

The seem to be a reaction is zero order as the data only fits to zero order integrated rate law.

Integrated rate law:

[A] = [A]_0 – kt

Here y = [ A] and slope is -k , so when we plot concentration of A with respect to t then we get the equation in the form of line

y = mx + c

So the answer Zero order in [A]

3 0

3 years ago

Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO Rig

BigorU [14]

Taking into account the reaction stoichiometry, the correct answer is the third option: 15.63 moles of HgO are needed to produce 250 g of O₂.

In first place, the balanced reaction is:

2 HgO → 2 Hg + O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

HgO: 2 moles
Hg: 2 moles
O₂: 1 moles

The molar mass of the compounds is:

HgO: 216.59 g/mole
Hg: 200.59 g/mole
O₂: 32 g/mole

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

HgO: 2 moles× 216.59 g/mole= 433.18 grams
Hg: 2 moles× 200.59 g/mole= 401.18 grams
O₂: 1 mole× 32 g/mole= 32 grams

Then the following rule of three can be applied: if by reaction stoichiometry 32 grams of O₂ are produced by 2 moles of HgO, 250 grams of O₂ are produced from how many moles of HgO?

$moles of HgO=\frac{250 grams of O_{2} x2 moles of HgO}{32grams of O_{2}}$

<u><em>moles of HgO= 15.625 moles≅ 15.63 moles</em></u>

Finally, the correct answer is the third option: 15.63 moles of HgO are needed to produce 250 g of O₂.

Learn more about reaction stoichiometry:

5 0

3 years ago

Match each element to the proper category.

kvasek [131]

Well where is the elements and category

5 0

3 years ago

Read 2 more answers

Uranium and radium are found in many rocky soils throughout the world. Both undergo radioactive decay, and one of the products i

Inessa05 [86]

(a) <u>0.15 Bq/L</u> is the safe level of radon in Bq/L of air/

<h3>Radionuclides: Uranium and Radium</h3>

So you've just had your water tested and the lab results are telling you that you've got radionuclides.

Radionuclides are radioactive isotopes or unstable forms of elements. Radioactivity is the release of energy, radiation, that occurs when these unstable elements decay or breakdown into more stable elements. This process is known as radioactive decay and is measured by the half-life of the element. The half-life is the time required for half of the original element to decay. The half-life for radionuclides can range from a few thousands of a second to a few billion years.

The two most common radionuclides found in groundwater supplies are Uranium and Radium. Uranium and Radium are naturally occurring elements that are found throughout the Mid-Atlantic and Northeastern United States in bedrock deposits like shale or granite deep below the surface. Rather than the glowing green rocks often portrayed in cinema or television, uranium and radium are found in ores mixed with other minerals and metals.

Uranium is the largest naturally occurring element on earth, nearly 70% denser than lead, and exists naturally as three different isotopes: U-234, U-235, and U-238, with U-238 and U-235 being the most common. U-235 is the preferred isotope for nuclear power generation. All three forms of uranium have the same chemical and physical properties, but have different radioactive properties.

In very low pH conditions, uranium exists in a cation oxidized form UO2, but it is most commonly present as anionic compounds UO2(CO3)2 and UO2(CO3)3. As uranium decays naturally over time, it releases radiation and forms new elements like radium, lead, and radon gas.

Learn more about radon

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5 0

1 year ago

The compound fes is an example of a(n) element ionic compound covalent compound atom

vfiekz [6]

FeS is an example of an ionic compound as in the formula there is a metal of Fe iron chemically bonded to the nonmetal S sulphur. Resulting in a strong electrostatic attraction due to the transfer of valence electrons from the iron to the Sulphur.

5 0

3 years ago