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3 years ago

As we grow older.

Chemistry

2 answers:

den301095 [7]3 years ago

7 0

Answer:

<u>C. We lose some of our ability to hear soft sounds</u>

Explanation:

As a person grows and matures his/her body requires more amounts of energy to maintain or sustain long enough. As the population grows old or ages what is called in the demographics as population aging, which is a fundamental phenomenon of how one sense slowly stops to respond to external stimulus.

Ability to hearing smelling tasting and touching all fade away with tie as man is not immortal neither his senses are, some people who have strong genetic makeup are considered superior to others while the rest of the population goes through the same phases of old age. While some may tend to ignore others.

Age is also considered to be a mental rather than a physical aspect.

qwelly [4]3 years ago

5 0

Answer:

I do believe it is A

Explanation:

As we grow older, our hearing system gets weaker causing our hearing to go off.

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Three kilograms of steam is contained in a horizontal, frictionless piston and the cylinder is heated at a constant pressure of

lakkis [162]

Answer:

Final temperature: 659.8ºC

Expansion work: 3*75=225 kJ

Internal energy change: 275 kJ

Explanation:

First, considering both initial and final states, write the energy balance:

$U_{2}-U_{1}=Q-W$

Q is the only variable known. To determine the work, it is possible to consider the reversible process; the work done on a expansion reversible process may be calculated as:

$dw=Pdv$

The pressure is constant, so: $w=P(v_{2}-v_{1} )=0.5*100*1.5=75\frac{kJ}{kg}$ (There is a multiplication by 100 due to the conversion of bar to kPa)

So, the internal energy change may be calculated from the energy balance (don't forget to multiply by the mass):

$U_{2}-U_{1}=500-(3*75)=275kJ$

On the other hand, due to the low pressure the ideal gas law may be appropriate. The ideal gas law is written for both states:

$P_{1}V_{1}=nRT_{1}$

$P_{2}V_{2}=nRT_{2}\\V_{2}=2.5V_{1}\\P_{2}=P_{1}\\2.5P_{1}V_{1}=nRT_{2}$

Subtracting the first from the second:

$1.5P_{1}V_{1}=nR(T_{2}-T_{1})$

Isolating $T_{2}$ :

$T_{2}=T_{1}+\frac{1.5P_{1}V_{1}}{nR}$

Assuming that it is water steam, n=0.1666 kmol

$V_{1}=\frac{nRT_{1}}{P_{1}}=\frac{8.314*0.1666*373.15}{500} =1.034m^{3}$

$T_{2}=100+\frac{1.5*500*1.034}{0.1666*8.314}=659.76$ ºC

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erik [133]

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3 years ago

A sample of a substance has these characteristics: melting point of 984 K hard, brittle solid at room temperature poor conductor

ANEK [815]

The correct answer is option 4, that is, an ionic compound.

The mentioned features belong to an ionic compound. The ionic compounds exhibit strong bonds in between their atoms, that is, an ionic bond is the strongest molecular bond, this confirms that ionic compounds exhibit a high melting point.

The ionic compounds do not transmit current, as they do not possess free electrons, like metals, thus, they are poor conductors as solid. The ionic compounds get dissolve in water and form ions that are the charges, which can move, making them good conductors as a liquid. The composition of the ionic compound is a set of crystals that makes them brittle and hard.

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3 years ago

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olganol [36]

The speed of sound is given by the formula
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3 years ago

9. Thallium-208 has a half-life of 3.053 min. How long will it take for 120 g of it to decay

damaskus [11]

Answer:

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Explanation:

Radioactive isotopes decay exponentially in time, the mass of the isotope ( $m(t)$ ), in grams, is described by the formula in time ( $t$ ), in minutes: