What role does evidence play in repeating experiments?

Answers

Answer 1

Answer: It helps affirm results of previous experiments.

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The elements of which group are nonreactive?

Answers

The elements react with other element and form compounds in order to complete their octet (possess 8 electrons in their valence shell) and attain stability. The formation of compounds by the elements can take place by either sharing of electrons or transfer of electrons from one atom to other atom. The elements whose octet is complete that means those elements which has eight electrons in their valence shell are nonreactive as they are already stable due to completion of octet.

In periodic table, the elements of group 18 (Noble gas) have their octet completely filled and are stable in the elemental form. Thus, the elements of group 18 (helium, neon, argon, krypton, xenon, radon, and oganesson) are nonreactive.

Final answer:

The noble gases in Group 18 are nonreactive due to their filled valence shells, but exceptions to this rule have been discovered

Explanation:

The elements in Group 18, also known as the noble gases (helium, neon, argon, krypton, xenon, and radon), are nonreactive. They have filled valence shells, which makes them stable and unreactive. However, it's important to note that this assumption was proven false by Dr. Neil Bartlett in 1962 when he discovered that some noble gases can react under certain conditions.

Thus, these specific gases are a group of chemical elements found in Group 18 of the periodic table and are typically characterized by their overall stability and lack of reactivity, making them useful in applications like lighting, lasers, and cryogenics.

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the balanced chemical equation for one neutralization reaction. In your equation, which reactant contributed the salt's positive ion? Which one contributes the salt's negative ion?

Answers

Answer:

See the answer below

Explanation:

A neutralization reaction is a reaction that involves acid and base with the production of salt and water as the end products. An example is as below:

HCl + NaOH --> NaCl + H2O

The salt produced here is NaCl. In solution, NaCl will ionize as:

$NaCl --> Na^+ + Cl^-$

Hence, the salt's positive ion (Na+) was contributed by the base (NaOH) while its negative ion (Cl-) was contributed by the acid (HCl).

Final answer:

In a neutralization reaction involving Ba(OH)2 and HNO3, the salt's positive ion comes from the base and the negative ion comes from the acid. In the molecular and net ionic equations, spectator ions, which are unaltered in the process, are included and excluded respectively.

Explanation:

In a neutralization reaction, an acid and a base react to produce water and a salt. Taking the provided reaction of Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H₂O(1), the salt's positive ion (Ba²+), also known as the cation, comes from the the base, Ba(OH)2. The salt's negative ion (NO3-), also known as the anion, comes from the acid, HNO3. This reaction also represents a molecular equation where all reactants and products are represented as neutral substances. A net ionic equation would exclude the spectator ions, ions whose presence is required to maintain charge neutrality but are chemically and physically unaltered by the process.

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Jordan wonders why there is dew on the grass in the morning. He asks a few friends to see what they think. His friend Tasha says that there is dew on the grass because it always rains at night. Did Jordan find a scientific answer?

Answers

No because dew is water droplets that come from condensation rather than from rain coming at night

Jordan did not find a scientific answer if a warm clear day is followed by a cool clear evening Dew will likely form

Which is a diatomic molecule?
A. Ar
B. CO
C. CO2
D. NaCl

Answers

NaCI is the answer, in what my teacher taught me. Hope I helped :)

How many atoms are present in 4.0 Mol of sodium

Answers

1 mole = 6.02 x 10^23 atoms (of any element)

So we are going to take our known value of 4 moles, and multiply by 6.02 x 10^23 (Avogadro's number) and we will get the number of atoms that are in 4 moles.

(4.0 moles of Na) x (6.02 x 10^23) / (1 mole) = 2.4 x 10^24 atoms of Na
There are 2.4 x 10^24 atoms of Na in 4.0 moles.

Final answer:

To find the number of atoms in 4.0 Mol of sodium, you need to multiply the number of moles by Avogadro's number. This will give you approximately 2.4088 x 10^24 atoms.

Explanation:

To calculate the number of atoms in 4.0 Mol of sodium, you need to use Avogadro's number, which is 6.022 x 1023 atoms per mole. The calculation is as follows:

Start with the number of moles given, which is 4.0 mol.Multiply this by Avogadro's number (6.022 x 1023) to get the total number of atoms:

4.0 mol x 6.022 x 1023 atoms/mol = 2.4088 x 1024 atoms

So, there would be approximately 2.4088 x 1024 atoms in 4.0 mol of sodium.