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3 years ago

Which of the following actions will lead to an increase in pressure?

1 answer:

3 0

By decreasing n we can increase presure because decrease in n will shift equilibrium to either forward or reverse direction

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Can someone make me a periodic table with color?

lilavasa [31]

Answer:

The periodic table is also split into four blocks: s = red, p = green, d = yellow, and f = blue.

4 0

2 years ago

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It is desired to determine the concentration of arsenic in a lake sediment sample by means of neutron activation analysis. The n

Artyom0805 [142]

Answer:

The daughter nuclide is selenium; 76:34 Se

Explanation:

The complete question is as follows;

is desired to determine the concentration of arsenic in a lake sediment sample by means of neutron activation analysis. The nuclide 75:33 As captures a neutron to form 76:33 As, which in turn undergoes beta decay. The daughter nuclide produces the characteristic gamma rays used for the analysis. What is the daughter nuclide?

solution:

Please check attachment for decay equations and explanations

5 0

3 years ago

When solid lead(II) sulfide ore burns in oxygen gas, the products are solid lead(II) oxide and sulfur dioxide gas.?

AlladinOne [14]

A. The complete balanced chemical reaction is:

PbS + 1.5 O2 ---> PbO + SO2

B. First let us convert mass of PbS into number of moles. The molar mass of PbS is 239.3 g/mol, hence:

moles PbS = 29.9 g/ (239.3 g/mol) = 0.125 mol

From the reaction, we need 1.5 moles of O2 for every 1 mole of PbS, therefore:

moles O2 = 0.125 mol * 1.5 = 0.1875 mol

The molar mass of O2 is 32 g/mol, hence the mass is:

mass O2 = 0.1875 mol * 32 g/mol = 6 grams O2

C. Converting mass to number of moles:

moles PbS = 65.0 g/ (239.3 g/mol) = 0.2716 mol

From the reaction, we can produce 1 mole of SO2 for every 1 mole of PbS, therefore:

moles SO2 = 0.2716 mol

The molar mass of O2 is 64 g/mol, hence the mass is:

mass SO2 = 0.2716 mol * 64 g/mol = 17.38 grams SO2

D. First let us convert mass of PbO into number of moles. The molar mass of PbO is 223.2 g/mol, hence:

moles PbO = 128 g/ (223.2 g/mol) = 0.573 mol

From the reaction, we need 1 mole of PbS for every 1 mole of PbO, therefore:

moles PbS = 0.573 mol

The molar mass of PbS is 239.3 g/mol, hence the mass is:

mass PbS = 0.573 mol * 239.3 g/mol = 137.23 grams PbS

5 0

3 years ago

Which statements describe molecules? Check all that apply.

maria [59]

Answer:

Molecules are made of two or more atoms

Molecules range in size

Molecules are made of atoms of the same element or different elements.

5 0

3 years ago

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The diagram shows an electron shell model of a sodium atom.

jeka94

B. The third shell would be empty so that the eight electrons in the second level would be outermost after the atom loses one electron.

3 0

3 years ago

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