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3 years ago

Scientists often repeat experiments multiple times.

Chemistry

2 answers:

uysha [10]3 years ago

5 0

Its A, hopes this helps

fgiga [73]3 years ago

4 0

Answer:

The answer is A.

Explanation:

Scientists repeat the same experiments because they wanna try to see if they keep getting the same result. When a scientific investigation is repeated, this is called replication. Replication is important in science so scientists can “check their work.” The result of an experiment is not likely to be well accepted unless the investigation is repeated many times and the same result is always obtained.

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Explain the difference between a theory and scientific law

Ksju [112]

Theory- <span>a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.

Scientific law- </span>a statement based on repeated experimental observations that describes some aspect of the universe.

8 0

3 years ago

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What is the volume of a salt crystal measuring 5.44 x 10-2m by 2.5 x10-3m by 7.9 x 10-3 m?

vivado [14]

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4 0

3 years ago

What instrument is used to find the density of an object

mart [117]

Answer:

Hydrometers

Density can be measured using a variety of instruments. A hydrometer is used to determine the density

Explanation:

3 0

4 years ago

Now that you have exercised, walked your

ASHA 777 [7]

Answer: The moles of melatonin are 0.000043

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass of melatonin = 0.01 g

Molar mass of melatonin $(C_{13}H_{16}N_2O_2)$ = 232.28 g/mol

$\text{Number of moles of melatonin}=\frac{0.01 g}{232.28g/mol}=0.000043mol$

Thus the moles of melatonin in 0.01 g are 0.000043

4 0

3 years ago

If 185 g of KBr are dissolved in 1.2 kg of water, what would be the expected change in boiling point? The boiling point constant

Fudgin [204]

Answer:

ΔTb = 0.66 C

Explanation:

Given

Mass of KBr = 185 g

Mass of water = 1.2 kg

Kb = 0.51 C/m

Explanation:

The change in boiling point (ΔTb) is given by the product of molality (m) of the solution and the boiling point constant (Kb)

$\Delta T_{b}= K_{b}* m$

$Molality = \frac{moles\ KBr}{Kg\ water} \\\\moles KBr = \frac{mass\ KBr}{Mol.wt\ KBr} = \frac{185}{119} = 1.555\\\\Molality (m) = \frac{1.555 }{1.2} =1.296 m\\$

[tex]\Delta T_{b}= 0.51 C/m * 1.296 m = 0.66 C[\tex]

6 0

4 years ago

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