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3 years ago

How might creativity help a scientist?

2 answers:

6 0

Students in science classes usually get the idea that scientific investigations involve careful observation and analysis of data to test hypotheses. One thing that remains shrouded in mystery, however, is how scientists decide on the particular questions they ask in the first place. For example, if you were to ask college biology students what they want to research or what motivates them to study science, they might say, "I want to find a cure for cancer." But if you were to ask which experiments or observations they plan to start with, most students would be at a loss. In contrast, if you were to flip through the table of contents of the journal, Cancer Research, you would find titles like "Ligand-Independent Androgen Receptor Variants Derived from Splicing of Cryptic Exons Signify Hormone-Refractory Prostate Cancer" (Hu et al., 2009). Clearly, the actual research topics scientists choose to study and publish papers about are quite a bit more specific than curing cancer.

user100 [1]3 years ago

3 0

Creativity allows a scientist to develop new ideas or evaluate old Ideas in a new way

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melting, boiling, and bending are considered physical changes, but burning is a chemical change. explain why this is so.

Naya [18.7K]

So, when you make something boiling or melting, its still the same substance. Water doesn't change into something else, just change its state of matter. When you burn something, one substance reacts with another. For example, when you burn carbon in oxygen, you get carbon dioxide. That's the difference.

8 0

4 years ago

Which graph is an exponential growth model? A B C

gtnhenbr [62]

A the first one represents an exponential growth chart

5 0

3 years ago

Three Stoichiometry Questions

andrezito [222]

Answer:

Explanation:

Given data:

Mass of aluminium = 2.5 g

Mass of oxygen = 2.5 g

Mass of aluminium oxide = 3.5 g

Percent yield = ?

Solution:

Chemical equation:

4Al + 3O₂ → 2Al₂O₃

Number of moles of Al:

Number of moles = mass/ molar mass

Number of moles = 2.5 g/ 27 g/mol

Number of moles = 0.09 mol

Number of moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 2.5 g/ 32 g/mol

Number of moles = 0.08 mol

Now we will compare the moles of aluminium oxide with aluminium and oxygen.

Al ; Al₂O₃

4 : 2

0.09 : 2/4×0.09 = 0.045

O₂ : Al₂O₃

3 : 2

0.08 : 2/3 ×0.08 = 0.053

The number of moles of aluminium oxide produced by Al are less so it will limiting reactant.

Mass of aluminium oxide:

Mass = number of moles × molar mass

Mass = 0.045 × 101.96 g/mol

Mass = 4.6 g

Percent yield:

Percent yield = actual yield / theoretical yield ×100

Percent yield = 3.5 g / 4.6 ×100

Percent yield = 76.1%

Given data:

Mass of copper produced = 3.47 g

Mass of aluminium = 1.87 g

Percent yield = ?

Solution:

Chemical equation:

2Al + 3CuSO₄ → Al₂(SO₄)₃ + 3Cu

Number of moles of Al:

Number of moles = mass/ molar mass

Number of moles = 1.87 g/ 27 g/mol

Number of moles = 0.07 mol

Now we will compare the moles of copper with aluminium.

Al ; Cu

2 : 3

0.07 : 3/2×0.09 = 0.105

Mass of copper:

Mass = number of moles × molar mass

Mass = 0.105 × 63.55 g/mol

Mass = 6.67 g

Percent yield:

Percent yield = actual yield / theoretical yield ×100

Percent yield = 3.47 g / 6.67 × 100

Percent yield = 52%

4 0

3 years ago

A compound has the empirical formula chcl. a 256ml flask, at 373 k and 750. torr, contains 0.800 g of the gaseous compound. give

Mashutka [201]

The answer is 2 I think

4 0

3 years ago

How many moles of silver chloride are produced from 15.0 moles of silver nitrate

Ghella [55]

15.0 moles of silver chloride are produced.

7 0

3 years ago