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Anika [276]
3 years ago
8

This step gives an investigation a specific direction or focus A.observation

Chemistry
2 answers:
frozen [14]3 years ago
5 0
The correct answer is c hypothesis
gayaneshka [121]3 years ago
5 0

Answer:

The correct answer will be option-C.

Explanation:

A scientific investigation is performed to answer and explain any natural phenomenon or event.  

Any scientific investigation can be performed by following the scientific method which includes many sequential steps which begin with making an observation, asking a question, do background research, propose a hypothesis which can be tested with experiments.

The main focus of any scientific investigation begins after proposing a well educated guess called hypothesis. A hypothesis is constructed on the basis of previous work due to which it explains the phenomenon to a limited extent which has to be tested.  

Thus, a hypothesis gives a direction and is the focus of a scientific investigation and is the correct answer.

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The winter is caused by __________. Which phrase best completes the sentence? indirect sunlight striking Earth Earth's far dista
victus00 [196]

Answer:

Earth's far distance from the sun

Explanation:

We have hot summers and cold winters because of the tilt of the Earth's axis. The tilt of the Earth means the Earth will lean towards the Sun (Summer) or lean away from the Sun (Winter) 6 months later.

8 0
3 years ago
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15. conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests t
son4ous [18]

Conjugated dienes routinely undergo 1,2 and 1,4 addition reactions with a variety of electrophilic reagents; this suggests that electrophilic reagents are likely intermediates during these reactions.

Two double bonds and one single bond divide a conjugated diene into two halves. Nonconjugated (Isolated) Dienes have more than one single bond separating two double bonds. Two double bonds are joined to the same atom to form cumulated dienes.

Reagents that function by acquiring electrons or sharing electrons that once belonged to a foreign molecule are referred to as electrophilic reagents, or electrophiles, in some cases. Electrophiles are molecules with a positive charge and a lack of electrons that can react by exchanging electron pairs with nucleophiles, which have many electrons. Epoxides, hydroxy amines, nitroso and azoxy derivatives, nitrenium ions, and elemental sulfur are significant electrophiles.

To know more about Electrophiles refer to: brainly.com/question/21773561

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7 0
1 year ago
if a lead can be extrated with 92.5% efficiency,what is the mass of ore required to make a lead sphere with 750%cm radius
Lady_Fox [76]
The mass of ore required is 21 700 t.

r = 750 cm

V = \frac{4}{3}  \pi  r^{3} = \frac{4}{3}  \pi  (750 cm)^{3} = 1.767 × 10⁹ cm³

The density of lead is 11.34 g/cm³.

So mass of lead sphere = 1.767 × 10⁹ cm³ × \frac{11.34 g}{1 cm^{3} } = 2.004 ×10¹⁰ g

2.004 ×10¹⁰ g × \frac{1 kg}{1000 g} = 2.004 × 10⁷ kg

2.004 × 10⁷ kg × \frac{1 t}{1000 kg} = 2.004 × 10⁴ t

92.5% efficiency means 92.5 t Pb per 100 t of ore.

Mass of ore = 2.004 × 10⁴ t Pb ×\frac{100 tore}{92.5 t Pb} = 2.17 × 10⁴ t ore = 21 700 t ore

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A biological mother, A biological father and a child
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The Eukaryotic cell has a nucleus
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2 years ago
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