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Chemistry

1 answer:

Vladimir [108]2 years ago

6 0

iron Bars form a solenoid when wrapped in a coil by a current carrying copper conducting wire .

copper coils generate a magnetic field when a current is passed through the coil . according to the helmholtz law.

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Humans affect Earth in many ways. The use of fossil fuels, the clear-cutting of forests, and controlled burns can affect the car

Andreyy89

I think the correct answer from the choices listed above is option A. It is by the process of photosynthesis that would help counteract with human interactions. The carbon dioxide emitted by human activities can be used by this process to produce more oxygen.

8 0

2 years ago

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The amount of 217 mg of an isotope is given by A(t) = 217 € -0.0171, where t is time in years since the initial amount of 217 mg

Maru [420]

The amount left after 20 years = 154.15 mg

<h3>Further explanation </h3>

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.

Usually radioactive elements have an unstable atomic nucleus.

The main particles are emitted by radioactive elements so that they generally decay are alpha (α), beta (β) and gamma (γ) particles

The decay formula for isotope :

$\tt \large{\boxed{\bold{A(t)=217e^{-0.0171t}}}$

Then for t=20 years, the amount left :

$\tt A(t)=217e^{-0.0171\times 20}\\\\A(t)=154.15~mg$

4 0

2 years ago

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Which of the following is true about the third shell?

AlladinOne [14]

Answer:

It has 3 subshells, it has 9 orbitals, and it has the capacity for 18 electrons

Explanation:

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3 years ago

Which choice below would match homozygous recessive?

LUCKY_DIMON [66]

The answer is B

Homozygous mean the same and you know that the two alleles will be the same (either BB or bb) and receive is usually the lower case set of alleles

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2 years ago

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Calculate the standard entropy of vaporization of ethanol at its boiling point, 352 K. The standard molar enthalpy of vaporizati

Korvikt [17]

Answer : The correct option is, (b) +115 J/mol.K

Explanation :

Formula used :

$\Delta S=\frac{\Delta H_{vap}}{T_b}$