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Talja [164]
4 years ago
5

Why might a scientist repeat an experiment if he/she did not make a mistake in the first one? An experiment should be repeated t

o A) increase income for increased work. B) prove how interesting the study was. C) ensure the results are accurate. Eliminate D) eliminate steps and save time.
Chemistry
2 answers:
makvit [3.9K]4 years ago
5 0

The answer is C. To ensure the results are accurate.

WINSTONCH [101]4 years ago
5 0

Answer: The answer is C.

Explanation: An experiment must be repeatable, so doing it multiple times can verify the work is correct.

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The mass of an erlenmeyer flask is 85.135 g. after 10.00 ml of water is added to the flask, the mass of the flask and the water
BARSIC [14]
Subtracting the mass of (flask+water) from the empty flask gives:
95.023 g - 85.135 g = 9.888 grams of water
Dividing this by the given volume of 10.00 mL water gives:
9.888 grams of water / 10.00 mL of water = 0.9888 g/mL of water
Therefore, based on this sample, the density of water is 0.9888 g/mL, which is close to the usually accepted approximation of 1 g/mL.
4 0
3 years ago
An upward force acts on a proton as it moves with a speed of 2.0 × 105 meters/second through a magnetic field of 8.5 × 10-2 tesl
mel-nik [20]

Explanation :

It is given that,

Speed of the proton, v=2\times 10^{5}\ m/s

Magnetic field, B=8.5\times 10^{-2}\ T

Magnetic force is given by :

F=q(v\times B)

q is the charge of proton, q=1.6\times 10^{-19}\ C

So,

F=1.6\times 10^{-19}\ C\times 2\times 10^{5}\ m/s\times 8.5\times 10^{-2}\ T

F=2.72\times 10^{-15}\ N

The direction of force is given by using right hand rule. So, the force will act in upward direction.

Hence, the correct option is (a) " 2.72\times 10^{-15}\ N to the north".

3 0
3 years ago
Read 2 more answers
2. Suppose that 21.37 mL of NaOH is needed to titrate 10.00 mL of 0.1450 M H2SO4 solution.
AysviL [449]

Answer:

0.1357 M

Explanation:

(a) The balanced reaction is shown below as:

2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O

(b) Moles of H_2SO_4 can be calculated as:

Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}

Or,

Moles =Molarity \times {Volume\ of\ the\ solution}

Given :

For H_2SO_4 :

Molarity = 0.1450 M

Volume = 10.00 mL

The conversion of mL to L is shown below:

1 mL = 10⁻³ L

Thus, volume = 10×10⁻³ L

Thus, moles of H_2SO_4 :

Moles=0.1450 \times {10\times 10^{-3}}\ moles

Moles of H_2SO_4  = 0.00145 moles

From the reaction,

1 mole of H_2SO_4 react with 2 moles of NaOH

0.00145 mole of H_2SO_4 react with 2*0.00145 mole of NaOH

Moles of NaOH = 0.0029 moles

Volume = 21.37 mL = 21.37×10⁻³ L

Molarity = Moles / Volume = 0.0029 /  21.37×10⁻³  M = 0.1357 M

7 0
3 years ago
Define saturated and unsaturated fats​
mr Goodwill [35]

Answer:

The human body needs both saturated fats and unsaturated fats to remain healthy. Most dietary recommendations suggest that, of the daily intake of fat, a higher proportion should be from unsaturated fats, as they are thought to promote good cholesterol and help prevent cardiovascular disease, whereas an overabundance of saturated fats is thought to promote bad cholesterol.

Explanation:

6 0
3 years ago
Which of the following statements is false? a. Temperatures of a few nanokelvins can be achieved in a Bose-Einstein condensate.
Veronika [31]

Answer:

Option D

A reversible process is one in which a large change in conditions can reverse its direction.

Explanation:

A. Temperatures of a few nanokelvins can be achieved in a Bose-Einstein condensate. TRUE

b. A perfect crystal of any substance at 0 K has minimum entropy. is TRUE

c. The standard molar entropy of a substance at temperature T is a measure of the quantity of energy that must be dispersed in that substance for it to exist at T. is TRUE

d. A reversible process is one in which a large change in conditions can reverse its direction. is FALSE

e. Entropy is a measurement of the nanoscale dispersal of energy in a sample of matter. is TRUE

A reversible reaction is one that can return to it's normal direct even if an infinitesimal change is applied to some of it's conditions.

7 0
3 years ago
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