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4 years ago

A preliminary untested explanation that tries to explain how or why things happen in the manner observed is a scientific

Chemistry

2 answers:

Alika [10]4 years ago

5 0

Answer:

The correct answer will be- scientific hypothesis

Explanation:

A scientific hypothesis is a predicted statement proposed on the basis of previous work related to the scientific question. Therefore, the scientific hypothesis is also known as an educated guess.

A scientific hypothesis is designed in a way that it contains the possibility which explains the natural phenomenon to an extent which could be tested through the experiments.

Since the hypothesis explains the phenomenon without testing which is done later through experiment therefore scientific hypothesis is the correct answer.

icang [17]4 years ago

3 0

It is a scientific hypothesis. A scientific hypothesis must be testable, however there is a significantly more grounded necessity that a testable speculation must meet before it can truly be viewed as logical. This foundation comes essentially from crafted by the rationalist of science Karl Popper, and is called "falsifiability".

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How many moles of FeCI3 are present in 345.0 g FeCI3

Sphinxa [80]

Answer:

$\boxed {\boxed {\sf About \ 2.127 \ moles \ of \ FeCl_3}}$

Explanation:

To convert from moles to grams, the molar mass must be used.

1. Find Molar Mass

The compound is iron (III) chloride: FeCl₃

First, find the molar masses of the individual elements in the compound: iron (Fe) and chlorine (Cl).

Fe: 55.84 g/mol

Cl: 35.45 g/mol

There are 3 atoms of chlorine, denoted by the subscript after Cl. Multiply the molar mass of chlorine by 3 and add iron's molar mass.

FeCl₃: 3(35.45 g/mol)+(55.84 g/mol)=162.19 g/mol

This number tells us the grams of FeCl₃ in 1 mole.

2. Calculate Moles

Use the number as a ratio.

$\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}$

Multiply by the given number of grams, 345.0.

$345.0 \ g \ FeCl_3 *\frac{162.19 \ g \ FeCl_3}{1 \ mol \ FeCl_3}$

Flip the fraction so the grams of FeCl₃ will cancel.

$345.0 \ g \ FeCl_3 *\frac{1 \ mol \ FeCl_3}{162.19 \ g \ FeCl_3}$

$345.0 *\frac{1 \ mol \ FeCl_3}{162.19 }$

$\frac{345.0 \ mol \ FeCl_3}{162.19 }$

Divide.

$2.12713484 \ mol \ FeCl_3$

3. Round

The original measurement of grams, 345.0, has 4 significant figures. We must round our answer to 4 sig figs.

For the answer we calculated, that is the thousandth place.

The 1 in the ten thousandth place tells us to leave the 7 in the thousandth place.

$\approx 2.127 \ mol \ FeCl_3$

There are about <u>2.127 mole</u>s of iron (III) chloride in 345.0 grams.

6 0

3 years ago

Describe the strength of the Coriolis effect as you move from the equator to the poles of the earth

Alekssandra [29.7K]

The Coriolis Effect describes the turn of the wind to the right in the Northern Hemisphere caused by earth's rotation.

3 0

3 years ago

Choose the number of significant figures indicated. 90

kvv77 [185]

There are 2 significant figures. All numbers in a whole number are significant.

3 0

3 years ago

Read 2 more answers

Given that the nucleophilic substitution reaction used 5.0 mL of t-pentyl alcohol and 12.0 mL of conc. hydrochloric acid to prod

Vladimir [108]

Answer:

4.90 g

Explanation:

Given that:

volume of t-pentyl alcohol = 5 mL

the standard density of t-pentyl alcohol = 0.805 g/mL

Recall that:

density = mass(in wt) /volume

mass = density × volume

mass = 0.805 g/mL × 5 mL

mass = 4.03 g

Volume of HCl used = 12 mL

The reaction for this equation is shown in the image attached below.

From the reaction,

88.15 g of t-pentyl alcohol reacts with concentrated HCl to yield 106.59 g pf t-pentyl chloride.

4.03 g of t-pentyl alcohol forms,

$= \dfrac{106.59 \ g \times 4.03 \ g}{88.15 \ g}$ of t-pentyl chloride.

Therefore,

Theoretical yield of t-pentyl chloride = 4.90 g

8 0

3 years ago

A swimming pool is filled with 160,000,000 mL of water, how many gallons of water are in the pool. Please show your work, and re

creativ13 [48]

Answer:

160000000 ml is 42267.528 gallons of water

6 0

4 years ago