All categories

2 years ago

28. Analyzing Results A pure white, solid material that

Chemistry

1 answer:

Dimas [21]2 years ago

7 0

Answer:

a :Chemical b : compound

Explanation:

a : it had to be a chemical change because it says "There is no change in

the appearance of the solid, but the reactivity of the material changes.

b : well it would be a compound because it would have to be to make a reaction

You might be interested in

Scientists are studying different jackets made for extremely cold, snowy weather. They are trying to find jackets

koban [17]

Answer:

Which jacket traps the most heat.

Explanation:

I took the test

8 0

3 years ago

An 100g box have a temperature of 22 C. What temperature must a 200g box be kept at in order for both to have the same amount of

Elis [28]

Answer:

the answer is 1 sir BC i t is BC it is BC its 2

4 0

3 years ago

Convert 35.0 m/s to cm/min

swat32

35 m/s = 210000 cm/min
35*600=210000

3 0

3 years ago

How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm^^ from an Au3+(aq) solution with

konstantin123 [22]

Answer:

It will take 5492 seconds to electroplate 0.5 mm of gold on an object .

Explanation:

Mass of gold = m

Volume of gold = v

Surface area on which gold is plated = $a=31 cm^2$

Thickness of the gold plating = h = 0.5 mm = 0.05 cm

1 mm = 0.1 cm

$V=a\times h=31 cm^2\times 0.05 cm=1.55 cm^3$

Density of the gold = $d=19.3 g/cm^3$

$m=d\times v=19.3 g/cm^3\times 1.55 cm^3=29.915g$

Moles of gold = $\frac{29.915 g}{197 g/mol}=0.152 mol$

$Au^{3+}+3e^-\rightarrow Au$

According to reaction, 1 mole of gold required 3 moles of electrons,then 0.152 moles of gold will require :

$\frac{3}{1}\times 0.152 mol=0.456 mol$ of electrons

Number of electrons = N = $0.456\times \times 6.022\times 10^{23}$

Charge on single electron = $q=1.6\times 10^{-19} C$

Total charge required = Q

$Q=N\times q$

Amount of current passes = I = 8 Ampere

Duration of time = T

$I=\frac{Q}{T}$

$T=\frac{N\times q}{I}$

$=\frac{0.456\times \times 6.022\times 10^{23}\times 1.6\times 10^{-19} C}{8 A}=5492 s$

It will take 5492 seconds to electroplate 0.5 mm of gold on an object .

7 0

3 years ago

Amino acids are the building blocks of proteins. The simplest amino acid is glycine . Draw a Lewis structure for glycine. (Hint:

madam [21]

Answer:

Sorry for the lack of precision, if you have any questions you can consult me again.

Explanation:

Glycine is an amino acid, forms proteins and is also called in its molecular chemical formula as C2H5NO2

5 0

3 years ago