What are the three states in which most matter occurs

How might a fact be disproved? Are there some facts that will never be disproved

Paha777 [63]

A fact can be disapproved with further evidence different details. So basically evidence can change a fact!! Hope this helps

7 0

2 years ago

1. In general, the nucleus of a small atom is stable. Therefore, over very short distances, such as those in a small nucleus,

postnew [5]

<h3>1. <u>Answer;</u></h3>

a. the strong nuclear force is much greater than the electric force.

<h3><u>Explanation</u>;</h3>

<em><u>For an atom to be stable it means it has enough amount of binding energy to hold its nucleus together permanently. </u></em>
Therefore, <em><u>an unstable atom lacks enough amount of binding energy to hold its nucleus permanently and thus undergoes decay to achieve stability. Unstable atoms are therefore referred to being radioactive.</u></em>
Small atoms are stable; <u>this is because they have equal number of protons and neutrons and thus the protons and neutrons fill up energy levels while maximizing the strong force binding the nucleus together. </u>

<h3>9.<u> Answer;</u></h3>

b. change into a different element altogether.

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will <em><u>change into a different element altogether</u></em>.

<h3><u> Explanation;</u></h3>

Unstable atoms undergo radioactive decay in order to achieve stability of their nucleus.
<em><u>Uranium-238 is an example of such atom, which may undergo decay to achieve stability.</u></em>
<em><u>Alpha decay is one of the types of decays,</u></em> others being beta decay and gamma decay. <em><u>In alpha decay the radioactive isotope undergoes decay such that its mass number is decreased by four and its atomic number is decreased by two.</u></em>
Therefore, <em><u>Uranium-238 undergoes alpha decay to form a different element whose mass number is 234 and atomic number is 90, known as thorium-234. </u></em>

5 0

3 years ago

Read 2 more answers

Please i need help ……

nasty-shy [4]

Answer:

H2

Explanation:

(l) means liquid

(s) means solid

(g) means gaseous

I hope this helped [:

3 0

2 years ago

Classify each statement as a property of ethers, alcohols, or both ethers and alcohols?

natita [175]

Explanation:

1. Only alcohols forms hydrogen bond between themselves and with other compounds containing an O-H, N-H, or F-H bond, such as water.

2. Alcohols up to 4 carbons are miscible in water because they have hydrogen bonded to oxygen and can form hydrogen bond with water. However, it is not possible for ethers.

3. When comparing ethers and alcohols of similar molecular weights, ethers have lower boiling point than alcohol. This is because of the presence of hydrogen bond in alcohols.

8 0

2 years ago

The shape (or geometry) of the amide anion, NH2-, the number of lone pairs on nitrogen, and the hybridization at nitrogen are, r

PtichkaEL [24]

Answer : The correct option is, (B) bent, 2, and $sp^3$

Explanation :

Formula used :

$\text{Number of electron pair}=\frac{1}{2}[V+N-C+A]$

where,

V = number of valence electrons present in central atom

N = number of monovalent atoms bonded to central atom

C = charge of cation

A = charge of anion

The given molecule is, $NH_2^-$

$\text{Number of electrons}=\frac{1}{2}\times [5+2+1]=4$

Number of bond pair = 2

Number of lone pair = 2

The total number of electron pair are 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral.

But as there are 2 atoms around the central oxygen atom, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent or angular.

Hence, the correct option is, (B) bent, 2, and $sp^3$

3 0

3 years ago