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4 years ago

If Maria winks exactly 5 times every minute and she sleeps

Chemistry

2 answers:

Marianna [84]4 years ago

6 0

Answer:

4800 times does Maria wink every day.

Explanation:

Number of time Maria winks= 5 times in minute = 5 winks/min

Number of hours she sleeps in day = 8 hours

1 day = 24 hours

Number of hours when Maria is not sleeping = 24 hour - 8 hour = 16 hours

1 hour = 60 minutes

16 hours = 16 × 60 min = 960 min

number of winks in 960 minutes:

$960 min\times 5 winks/min=4800 winks$

4800 times does Maria wink every day.

Elina [12.6K]4 years ago

4 0

First, we need to find the amount of winks in an hour, to simplify it so we can answer easier. Since there are 60 minutes in an hour, we can multiply 5 by 60 to find the number of winks in an hour.

5*60=300

Now multiply 300 by 8.

300*8=2,400

She winks exactly 2,400 times per day.

Hope this helps!

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Which statement is not an example of intercellular communication?

bagirrra123 [75]

Answer:

D: A white blood cell produces antibodies.

Explanation:

Intercellular communication is defined as the process of communication that occurs between the two cells of the same organism.

Now, these two cells relate which each other when a signal reception receives a single molecule at a distance that could be short or long which in turn produces a cellular response.

Thus, looking at the options, the correct answer is Option D.

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3 years ago

What is a cause of cemical weathering? A. sunlight B. wind C. gravity D. acids

siniylev [52]

D. Acids I hope this helped ur welcome

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3 years ago

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Which out of Ca and Zn atoms has higher ionization energy and why?

bulgar [2K]

Zn because it has more strength into it

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3 years ago

A solution of sodium chloride in water has a vapor pressure of 19.6 torr at 25°C. What is the mole fraction of NaCl in this solu

Debora [2.8K]

Answer:

Mole fraction of Nacl is 0.173

Explanation:

we know that

$P_{sol}=\chi_{solvent}P^0_{solvent}$

where,

P sol - the vapor pressure of the solution

χ solvent - the mole fraction of the solvent

P ∘ solvent - the vapor pressure of the pure solvent

This means that in order to be able to calculate the mole fraction of sodium chloride, you need to know what the vapor pressure of pure water is at

25 ° C You can use an online calculator to find that the vapor pressure of pure water at 25 C is equal to about 23.8 torr .

$\chi_{water}= \frac{P{sol}}{P^0{water}}$

$\chi_{water}= \frac{19.6}{23.8}$

=0.827

Also we know that

$\chi_{water}+\chi_{Nacl}= 1$

This means that the mole fraction of sodium chloride is

χ_{Nacl}= 1-Χ_{water}

= 1-0.827 =0.173

3 0

3 years ago

An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.81 amu. What is the percent abund

kolezko [41]

Answer:

40.5% is abundance of X-122

Explanation:

we know there are two naturally occurring isotopes of X, X-120 and X-122.

First of all we will set the fraction for both isotopes

X for the isotopes having mass 122

1-x for isotopes having mass 12 0

The average atomic mass of X is 120.81 amu

we will use the following equation,

122x + 120 (1-x) = 120.81

122x + 120 - 120x = 120.81

122x- 120x = 120.81 -120

2x = 0.81

x= 0.81/2

x= 0.405

0.405 × 100 = 40.5%

40.5% is abundance of X-122 because we solve the fraction x.

now we will calculate the abundance of X-120.

(1-x)

1 - 0.405 = 0.595

0.595 × 100 = 59.5 %

59.5 % for X-120.

5 0

3 years ago