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Marina86 [1]
4 years ago
6

What is the modern model of the atom?

Chemistry
1 answer:
Butoxors [25]4 years ago
3 0

Answer: The current model of the atom shows an atom that is mostly empty space. In the center is a small nucleus made of protons and neutrons. The nucleus contains nearly all the mass of an atom. This model continues to be refined as new technology is developed that allows us to better observe atoms and their behavior.

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methane Express your answer as a condensed structural formula omitting all bonds (e.g CH3CH2CH3). nothing Request Answer Part B
bonufazy [111]

Answer:

a

 The condensed structural formula for methane is

            CH_4

b

 The condensed structural formula for ethane is

           CH_3 CH_3

c

  The condensed structural formula for pentane is  

            CH_2(CH_2)_3CH_3

d

   The diagram for the structural formula for cyclopropane is shown on the first uploaded image

Explanation:

3 0
4 years ago
Which substance has ionic bonds?<br><br><br><br>A) Br2<br><br>B) NH3<br><br>C) H2O<br><br>D) LiI
ludmilkaskok [199]
D

ionic bond is between a metal and non-metals

Lithium(Li) is a metal. it will lose one electron in ionization.
iodine (I)is non metal. it will gain one electron from Lithium in ionization

hope this helps
3 0
4 years ago
Uranium-238 decays by alpha emission. what is the mass number of the resulting element? express your answer numerically as an in
vredina [299]
Answer is: mass number of element is 234.
<span>Alpha particle is nucleus of a </span>helium-4<span> atom, which is made of two </span>protons<span> and two </span>neutrons<span>.
</span>²³⁸U → ²³⁴Th + α (alpha particle).
Alpha decay is radioactive decay<span> in which an </span>atomic nucleus<span> emits an </span>alpha particle<span> (helium nucleus) and transforms into an atom with </span>an atomic number that is reduced by two <span>and </span>mass number<span> that is reduced by four</span><span>.</span>

4 0
4 years ago
14. Which is the variable that is purposely changed to test a hypothesis?
LiRa [457]

Answer:

manipulated variabl

Explanation:

In a scientific experiment, the one variable that is purposely changed to test a hypothesis is called the manipulated variable

3 0
4 years ago
Read 2 more answers
BEBE
DIA [1.3K]

Reaction 1 : yes

Reaction 2 : no

<h3>Further explanation</h3>

The metal activity series is expressed in voltaic series  

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au  

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent  

The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent

So that the metal located on the left can push the metal on the right in the redox reaction  

From activity series of Halogen :

F₂>Cl₂>Br₂>I₂

F₂ is the strongest oxidizing agent

1. Reaction

Cl₂ + 2Rbl - 2RbCI+ I₂

Cl₂>I₂⇒reaction can occur⇒yes, reactions will take place.

2. Reaction

I₂ + NiBr₂ - NI₂ + Br₂

Br₂>I₂⇒Reaction can't occur⇒no, reaction will not take place

3 0
3 years ago
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