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3 years ago

Someone plz answer this

Chemistry

2 answers:

siniylev [52]3 years ago

5 0

Answer: I would choose the fourth

Explanation: b/c group 18 on the periodic table have the most stable valence electrons (the # of valence electrons are full and no side outweighs another). At least that’s what my teacher last year said.

Leno4ka [110]3 years ago

4 0

Answer:

It's either 2-4, use process of elimination (sorry i could not help more!)

Explanation:

Group 18 is the most stable due to having the max. number of valence electrons that their outer shell can hold.

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Identify this reaction.

sp2606 [1]

C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O

is a combustion reaction

Explanation:

In a combustion reaction a chemical substance (usually organic substances) are reacted with oxygen to form the most stable oxides and heat.

CH₄ + 2 O₂ → CO₂ + 2 H₂O

In a double displacement reaction two compounds exchange elements.

AB + CD → AC + BD

In a decomposition reaction a compound is split into simpler substances.

AB → A + B

In a synthesis reaction two elements are combined to form another compound. A + B → AB

In a single displacement reaction a compound exchange one of its elements.

AB + C → AC + B

Learn more about:

types of chemical reactions

brainly.com/question/314641

#learnwithBrainly

8 0

3 years ago

I need help ASAP! How many reactants and products are in each element according to the chemical equation above. Please explain t

Nikitich [7]

Answer: 1,4,1 for the reactants
3,1,4,1 for the products

Explanation:
The products are equal to the reactants because of the conservation of matter.

6 0

3 years ago

fill in the blank: 1.)the amount of space that matter fills is its.................. 2.)a state of matter with a definite volume

marshall27 [118]

1) mass

2) gas

3) liquid

4) temperature

5) pressure

8 0

3 years ago

Read 2 more answers

Use what you know about the orbits of Earth and the moon to sort the phrases into the correct Category.

Kobotan [32]

$\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}$

Actually Welcome to the Concept of the Astrophysics.

Let's categorize them eventually ==>

1.) Earth ==> 1.) travels around the Sun

2.) takes 365.25 days .

2.) Moon ===> 1.) travels around the Earth

2.) Takes 27.3 days.

8 0

3 years ago

Calculate the equilibrium number of vacancies per cubic meter for copper at 1000K. The energy for vacancy formation is 0.9eV/ato

nexus9112 [7]

Answer:

Therefore the equilibrium number of vacancies per unit cubic meter =2.34×10²⁴ vacancies/ mole

Explanation:

The equilibrium number of of vacancies is denoted by $N_v$ .

It is depends on

total no. of atomic number(N)
energy required for vacancy
Boltzmann's constant (k)= 8.62×10⁻⁵ev K⁻¹
temperature (T).

$N_v=Ne^{-\frac{Q_v}{kT} }$

To find equilibrium number of of vacancies we have find N.

$N=\frac{N_A\ \rho}{A_{cu}}$

Here ρ= 8.45 g/cm³ =8.45 ×10⁶m³

$N_A$ = Avogadro Number = 6.023×10²³

$A_{Cu}$ = 63.5 g/mole

$N=\frac{6.023\times 10^{23}\times 8.45\times 10^{6}}{63.5}$

$=8.01\times 10^{28$ g/mole

Here $Q_v$ =0.9 ev/atom , T= 1000k

Therefore the equilibrium number of vacancies per unit cubic meter,

$N_v=( 8.01\times 10^{28}) e^{-(\frac{0.9}{8.62\times10^{-5}\times 1000})$

=2.34×10²⁴ vacancies/ mole

3 0

3 years ago