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2 years ago

Help!!!!! Which of the following is a characteristic of reliable scientific study

Chemistry

2 answers:

Angelina_Jolie [31]2 years ago

8 0

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dybincka [34]2 years ago

7 0

Answer:

A reliable scientific study is supported by empirical evidence.

Explanation:

Science is the set of knowledge that is organized systematically obtained from observation, experimentation and reasoning within specific areas. In other words, science is empirical knowledge of the universe that is established according to the principles of the scientific method. The scientific method will vary according to the type of field of study, but you can define how the process by which a theory can be demonstrated or refuted. The scientific method is then defined as a set of ordered steps that are used to acquire new knowledge. In order to be qualified as a scientist, it must be based on empiricism, on measurement and, in addition, must be subject to reason. It is characterized by reproducibility, that is, the ability to repeat a given experiment, anywhere and by anyone. Another characteristic of the scientific method is refutability, that is, that every scientific proposition has to be susceptible to being falsified or refuted. This implies that experiments could be designed, which, in the case of giving different results to those predicted, would deny the hypothesis tested.

Then, as a reliable scientific study and science is based on the scientific method, which in turn is supported by experimental evidence, it is possible to say that a reliable scientific study is supported by empirical evidence.

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Carbon-14 (14C) dating assumes that the carbon dioxide on the Earth today has the same radioactive content as it did centuries a

Nataly [62]

Answer: The tree was burned 16846.4 years ago to make the ancient charcoal

Explanation:

The equation used to calculate rate constant from given half life for first order kinetics:

$t_{1/2}=\frac{0.693}{k}$

where,

$t_{1/2}$ = half life of the reaction = 5715 years

Putting values in above equation, we get:

$k=\frac{0.693}{5715yrs}=1.21\times 10^{-4}yrs^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $1.21\times 10^{-4}yr^{-1}$

t = time taken for decay process = ? yr

$[A_o]$ = initial amount of the sample = 100 grams

[A] = amount left after decay process = 13 grams

Putting values in above equation, we get:

$1.21\times 10^{-4}=\frac{2.303}{t}\log\frac{100}{13}\\\\t=16864.4yrs$

Hence, the tree was burned 16846.4 years ago to make the ancient charcoal

8 0

2 years ago

What are all the intermolecular forces present in a sample of BrF?

yuradex [85]

Answer:

dipole-dipole

Explanation:

Intermolecular forces exists between the molecules of a substance in a particular state of matter.

The type of intermolecular forces present in a substance is determined by the electronegativity difference between the atoms that compose the substance.

There is a non zero electronegativity difference between Br and F hence the molecule is polar and the intermolecular forces between the molecules of BrF are dipole-dipole forces.

4 0

2 years ago

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi

Katena32 [7]

C7H16, where C=12.01, and H=1.01, so the weight of the molecule would be 7(12.01)+16(1.01), or 100.23. The percentage of carbon would be found by ((7*12.01)/100.23)*100=83.88% Carbon
((16*1.01)/100.23)*100=16.12% Hydrogen

7 0

3 years ago

A gas sample is held at constant temperature. What happens to the pressure of the sample if the volume is doubled and the number

Iteru [2.4K]

Answer:

If the volume is doubled and the number of molecules is doubled, pressure is unchanged

Explanation:

Step 1: Data given

Temperature = constant

Volume will be doubled

Number of molecules will be doubles

Step 2:

p*V = n*R*T

⇒ gas constant and temperature are constant

Initial pressure = n*R*T / V

Initial pressure = 2*R*T/2

Initial pressure = RT

Final pressure = 4*RT / 4

Final pressure = R*T

If the volume is doubled and the number of molecules is doubled, pressure is unchanged

3 0

2 years ago

The half-life of C-14 is 5470 years. If a particular archaeological sample has one-quarter of its original radioactivity remaini

-Dominant- [34]

10940? Sorry if it isn’t correct

3 0

2 years ago

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