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3 years ago

IM DUMMY STUPID AND I NEED HELP. True or False. A force is a push or pull exerted on an object.

Chemistry

2 answers:

trasher [3.6K]3 years ago

4 0

its true cuz of newtons laws?????? ok free points

boyakko [2]3 years ago

3 0

Answer: true

Explanation:

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What quantity of aluminium is deposited when a current of 10A is passed through a solution of aluminium salt for 1930s? (All=27,

Arlecino [84]

Answer:

AL*3+ + 3e- =AL.

（10A×1930）÷96500=0.2mole e-

0.2÷3×27=1.8g（AL）

6 0

3 years ago

Lens coating are made of A.teflon B.bakelite C.melamine D.PVC

suter [353]

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Explanation:

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3 years ago

Corrosion may be regarded as the destruction of metal by:

NeX [460]

All of the above I think it might not be right

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2 years ago

In a physical change, the _____ does not change.

Ksivusya [100]

Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.

7 0

3 years ago

Molybdenum (Mo) has a body centered cubic unit cell. The density of Mo is 10.28 g/cm3. Determine (a) the edge length of the unit

ser-zykov [4K]

Answer:

For a: The edge length of the unit cell is 314 pm

For b: The radius of the molybdenum atom is 135.9 pm

Explanation:

For a:

To calculate the edge length for given density of metal, we use the equation:

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density = $10.28g/cm^3$

Z = number of atom in unit cell = 2 (BCC)

M = atomic mass of metal (molybdenum) = 95.94 g/mol

$N_{A}$ = Avogadro's number = $6.022\times 10^{23}$

a = edge length of unit cell =?

Putting values in above equation, we get:

$10.28=\frac{2\times 95.94}{6.022\times 10^{23}\times (a)^3}\\\\a^3=\frac{2\times 95.94}{6.022\times 10^{23}\times 10.28}=3.099\times 10^{-23}\\\\a=\sqrt[3]{3.099\times 10^{-23}}=3.14\times 10^{-8}cm=314pm$