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3 years ago

2 Points

Chemistry

1 answer:

lara [203]3 years ago

3 0

Answer:

All colors except blue are absorbed while blue is reflected. We

only see blue

Explanation:

When you go and see something blue as the sky, all of the colors are absorbed except blue. That is how we see colors

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1. A sample of polystyrene is found to have a number-average molar mass of 89,440 g mol−1 . Neglecting contributions from end gr

Snowcat [4.5K]

Answer:

The weight-average molar mass of polystyrene is 134,160 g/mol.

Explanation:

Molar mass of the monomer styrene , $C_8H_8$ , M=104 g/mol

Given , number average molar mass of the polymer , M'= 89,440 g/mol

Degree of polymerization = n

$n=\frac{M'}{M}=\frac{89,440 g/mol}{104 g/mol}=860$

The weight-average molar mass = $M_{avg}=?$

Molar mass dispersity is ratio of weight-average molar mass to the number average molar mass of the polymer.

$\text{Molar mass dispersity}=\frac{M_{avg}}{M'}$

$1.5=\frac{M_{avg}}{89,440 g/mol}$

$M_{avg}=89,440 g/mol\times 1.5 = 134,160 g/mol$

The weight-average molar mass of polystyrene is 134,160 g/mol.

8 0

2 years ago

Which part of an experiment do scientists change the independent or dependent variable?

Ahat [919]

Scientists change the independent variable; The dependent variable is the one that reacts to the independent variable.

5 0

2 years ago

When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occur

Naya [18.7K]

I believe its the first one, hope this helps :)

7 0

2 years ago

Read 2 more answers

What is the mass, in grams, of 28.42 mL of acetone

Andrej [43]

Just go on to google and sera he it up

5 0

3 years ago

The consumption schedule is such that Multiple Choice

Serga [27]

Answer:

a. the MPC is constant and the APC declines as income rises.

Explanation:

Hello,

At first, lets remember that the marginal propensity to consume (MPC) is a indicator that quantifies the induced consumption. It occurs with an increase in disposable income (income after taxes and transfers).

On the other hand, APC is the ratio of consumption to income as well as the proportion of income that is consumed.

In this manner, the consumption schedule is such that the MPC is constant and the APC declines as income rises, that is a. option.

Best regards.

8 0

3 years ago