All categories

3 years ago

What is a Control trial

1 answer:

8 0

It is a trial aimed to reduce bias during an experiment. An example would be a sugar pill, something that has no real effect so that the results of the true trial can accurately be compared. Its like a control group.

You might be interested in

draw the lewis structure for pcl6, then answer the following questions: 1. how many valence electrons does this compound have? 2

DedPeter [7]

The Pcl6 has 48 bonded electrons and 18 lone pairs.

The Lewis structure of Pcl6 is as follows: -

Phosphorous is bonded with 6 chlorine atoms with 18 lone pairs.

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule. [1][2][3] A Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds.

In Lewis structure, atoms are bonded with single bonds. If total number of electrons are 't' and number of bonds are 'n', then t-2n number of electrons are to be placed. Once the central atom is placed, they need to complete the octet rule.

Learn more about Lewis-dot structure from,

brainly.com/question/18083461

#SPJ4

5 0

1 year ago

A(n) ____ is a substance that produces H+ ions in a water solution.

neonofarm [45]

Answer:

Electron

Explanation:

Hydrogen ion, is strictly, the nucleus of a hydrogen atom and can be separated from its accompanying electron.

7 0

4 years ago

Read 2 more answers

GOOD REWARD<br> I will report those who gives random answers.

Helen [10]

Answer:

3 mol AlCl₃.

Explanation:

Hello!

In this case, according to the specified reactants and products, it is possible to set up the following balanced chemical reaction:

$Al(NO_3)_3+3NaCl\rightarrow 3NaNO_3+AlCl_3$

Whereas we evidence the 1:3 mole ratio between aluminum nitrate and sodium chloride; thus, since different moles were reacting, we need to identify the limiting reactant by computing the moles of AlCl₃ produced by each reactant as follows:

$n_{AlCl_3}^{by\ Al(NO_3)_3}=4molAl(NO_3)_3*\frac{1molAlCl_3}{1molAl(NO_3)_3} =4molAlCl_3\\\\n_{AlCl_3}^{by\ NaCl}=9molNaCl*\frac{1molAlCl_3}{3molNaCl} =3molAlCl_3$

Thus, we infer that NaCl is the limiting reactant as it produces the fewest moles of AlCl₃; consequently the produced amount of this product is 3 mol.

Best regards!

5 0

3 years ago

In a nuclear fission reaction a heavy nucleus divides to form smaller nuclei and one or more neutrons. Many nuclei can undergo f

Effectus [21]

Answer:

$\frac{235}{92} U +$ $\frac{1}{0} n$ -------> $\frac{139}{36} Ba$ + $\frac{94}{56} Kr + 3\frac{1}{0} n$

$\frac{235}{92} U + \frac{1}{0} n -------> \frac{90}{38} Sr + \frac{143}{54} Xe + 3\frac{1}{0} n$

Explanation:

In equation 1, equating the mass number (A) on both sides.

A = 235 + 1 = A + 94 + 3*1

236 = A + 94 + 3

A = 236 - 94 = 3

A = 139

Equate the atomic numbers on both sides

92 + 0 = Z + 36 + 3*0

92 = Z + 36

Z = 92 - 36

Z = 56

In reaction 2, equating the mass number on both sides

235 + 1 = A + 143 + 3 *1

236 = A + 143 + 3

236 = Z + 146

Z = 90

Equatoing the atomic number of both sides

92 + 0 = Z + 54 + 3*0

92 = Z + 54

Z = 92 - 54

Z = 38.

7 0

3 years ago

Through what process do humans and animals get the energy they need?

xenn [34]

Answer:

C heat energy

Explanation:

8 0

3 years ago