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4 years ago

Which scenario represents a scientific investigation?

Chemistry

1 answer:

trasher [3.6K]4 years ago

6 0

Answer:

yes

Explanation:

....

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The means of X ? ⊙_⊙⊙_⊙⊙_⊙

julsineya [31]

Answer:

x means unknown it is an unknown value.

For example if you have 2 x you have 2 u know values.

Explanation:

If you want us to explain it further please provide a picture.

5 0

3 years ago

Read 2 more answers

A mysterious white powder could be powdered sugar (C12H22O11), cocaine (C17H21NO4), codeine (C18H21NO3), norfenefrine (C8H11NO2)

konstantin123 [22]

Answer: norfenefrine $(C_8H_{11}NO_2)$

Explanation:

Depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T_f^0-T_f=(-114.6-(-115.5)^0C=0.9^0C$ = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte)

$K_f$ = freezing point constant = $1.99^0C/m$

m= molality

$\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}$

Weight of solvent (ethanol)= $density\times volume=0.789g/cm^3\times 1.50cm^3=1.18g=1.18\times 10^{-3}kg$

Molar mass of unknown non electrolyte = M g/mol

Mass of unknown non electrolyte added = 82 mg = 0.082 g (1g=1000mg)

$0.9=1\times 1.99\times \frac{0.082g}{M g/mol\times 1.18\times 10^{-3}}kg}$

$M=154g/mol$

The molecular mass of norfenefrine $(C_8H_{11}NO_2)$ is near to 154 and thus the identity of the white powder is norfenefrine .

4 0

3 years ago

Explain what states are changing in these examples

miv72 [106K]

(A) ice to water
(B) water to water vapor

8 0

3 years ago

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Greeley [361]

B, the height above or below sea level

3 0

3 years ago

When 20 ml of 0.1 M HCl is mixed with 20

Bas_tet [7]

Answer:

it is b i took the test

Explanation:

4 0

2 years ago