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3 years ago

Answer the following questions in brief.Why does silver get tarnished on exposure to air?

1 answer:

Studentka2010 [4]3 years ago

5 0

Answer: When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish. This process is called tarnishing.

Hope this helped :)

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Which of the following is an example of a mixture?

GuDViN [60]

Explanation:

hey my name is barsha CO2 + H2 + 02

3 0

3 years ago

How many atoms are in this formula? 4 O2 A 2

Effectus [21]

Answer:

8 atoms as 4*2=8

Explanation:

4 0

3 years ago

The common titanium alloy known as T-64 has a composition of 90 weight% titanium 6 wt% aluminum and 4 wt% vanadium. Calculate th

Anna007 [38]

Explanation:

Suppose in 100 g of alloy contains 90% titanium 6% aluminum and 4% vanadium.

Mass of titanium = 90 g

Moles of titanium = $\frac{90 g}{47.87 g/mol}=1.8800 mol$

Total number of atoms of titanium , $a_t=1.8800 mol\times N_A$

Mass of aluminum = 6 g

Moles of aluminium = $\frac{6 g}{26.98 g/mol}=0.2223 mol$

Total number of atoms of aluminium, $a_a=0.2223 mol\times N_A$

Mass of vanadium = 4 g

Moles of vanadium= $\frac{4 g}{50.94 g/mol}=0.0785 mol$

Total number of atoms of vanadium $a_v=0.0785 mol\times N_A$

Total number of atoms in an alloy = $a_t+a_a+a_v$

Atomic percentage:

$Atomic\%=\frac{\text{total atoms of element}}{\text{Total atoms in alloy}}\times 100$

Atomic percentage of titanium:

: $\frac{a_t}{a_t+a_a+a_v}\times 100=\frac{1.8800 mol\times N_A}{1.8800 mol\times N_A+0.2223 mol\times N_A+0.0785 mol\times N_A}\times 100=86.20\%$

Atomic percentage of Aluminium:

: $\frac{a_a}{a_t+a_a+a_v}\times 100=\frac{0.2223 mol\times N_A}{1.8800 mol\times N_A+0.2223 mol\times N_A+0.0785 mol\times N_A}\times 100=10.19\%$

Atomic percentage of vanadium

: $\frac{a_v}{a_t+a_a+a_v}\times 100=\frac{0.0785 mol\times N_A}{1.8800 mol\times N_A+0.2223 mol\times N_A+0.0785 mol\times N_A}\times 100=3.59\%$

6 0

4 years ago

Which of 2 of these will have a single covalent bond? N2, H2, O2, F2

Ahat [919]

Answer:

H2 & F2

Explanation:

A covalent bond is formed when an electron is shared between two atoms. The two electrons of the covalent bond are positioned between the nuclei of the both bonding atoms. The electron pair of the bond may be equidistant from the nucleus of the two atoms or nearer to the nucleus of one of the bonding atoms than the other depending on the relative electro negativities of the both bonding atoms.

For homonuclear covalent bonds, there is no electro negativity difference between the bonding atoms. A single line may be used to indicate the shared electron pair between the two atoms.

Hydrogen and fluorine form homonuclear covalent diatomic compounds in which only a single electron pair is shared between bonding atoms. A single covalent bond is found connecting the two bonding atoms, hence the answer.

8 0

4 years ago

An MSDS is a document that

Georgia [21]

Answer:

The corect answer is d. all of the above. The complete explanation is given below.

Explanation:

A Material Safety Data Sheet (MSDS) is a document with a description about potential hazards (health, environment, reactivity, etc.), physical properties, how to storage and how to manipulate and work safely with a given chemical product or substance. These kind of documents are standarized to a correct interpretation of final user. When someone purchased a chemical, chemical supply companies must provide the respective MSDS. However this kind of label are not legally required to be accurate.

3 0

3 years ago

Answer the following questions in brief.Why does silver get tarnished on exposure to air?​

Answer the following questions in brief.Why does silver get tarnished on exposure to air?