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3 years ago

How did plastics become the material of choice for so many varied applications?

Chemistry

1 answer:

Maslowich3 years ago

7 0

Answer:

people as: it Is less expensive. easy to carry

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Which type of reaction always has an element and a compound as reactants?

ladessa [460]

Answer:

B. single-replacement

Explanation:

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3 years ago

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A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.

zysi [14]

Answer:

V = 102.0 ml

m = 91.0 ml

density = ...?

density = m / V

= 91.0 / 102.0

= 0.89215 g/ml

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2 years ago

Need help with 22 and 24

choli [55]

Answer:

22:

Formular:

$atomic \: mass = \frac{ \sum(isotopic \: mass \times \%abundance)}{100} \\$

substitute:

$atomic \: mass = \frac{(23.985 \times 78.70) + (24.986 \times 10.13) + (25.983 \times 11.17)}{100} \\ \\ = \frac{(1887.620) + (253.108) + (290.230)}{100} \\ \\ = \frac{2430.958}{100} \\ \\ { \boxed{ \boxed{average \: atomic \: mass = 24.3 \: amu}}}$

23:

Same element is represented by same number of protons. 

Answer:

6 protons. 6 protons

7 neutrons. 8 neutrons

6 electrons. 6 electrons

Note: Atoms with same proton number but different mass number are called isotopes

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3 years ago

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What are 4 other gases in the atmosphere besides oxegen and nitergin?

Levart [38]

Helium, neon,nitrogen and argon

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3 years ago

What would happen if the Earth was tilted more than its current tilt of 23.5°? HELP ASAP!!

Oduvanchick [21]

Answer:

Wouldn't the Earth's atmosphere be moving too fast that it eventually breaks out?

Explanation:

Do NOT trust me.

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3 years ago