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1 year ago

Please help I need to draw and label a atom that has 7 protons and 8 neutrons!!!! I will give a brainly

Chemistry

1 answer:

Galina-37 [17]1 year ago

6 0

Answer:

Oxygen

Explanation:

Given the following question:

The following atom has 7 protons (plus charge)
The following atom has 8 neutrons (negative charge)
The following atom has 7 electrons since the number of electrons are equal to the number of protons the atom has.

The following atom is oxygen with a mass number of 16: (see photo below)
Let the red represent protons...
Let the gray represent the neutrons...
Let the blue represent the electrons...

Hope this helps.

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What is the guiding formula for combustion reactions

IgorLugansk [536]

Answer:

Explanation: so a combustion occurs when we react a substance with oxygen .you commonly call this "burning'' .therefore combustion will always include oxygen in the equation and the product will include carbon dioxide and give off water vapours

Therefore the general equation for a complete combustion reaction would be

Fuel + O2 ------ CO2 + H2O

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2 years ago

What is arranged to form a material with a crystal structure

mafiozo [28]

Answer:

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. The scientific study of crystals and crystal formation is known as crystallography.

Explanation:

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2 years ago

For the reaction, calculate how many grams of the product form when 14.4 g of Br2 completely reacts. Assume that there is more t

lora16 [44]

Answer:

The answer to your question is 21.45 g of KBr

Explanation:

Chemical reaction

2K + Br₂ ⇒ 2KBr

14.4 ?

Process

1.- Calculate the molecular mass of bromine and potassium bromide

Bromine = 2 x 79.9 = 159.8g

Potassium bromide = 2(79.9 + 39.1) = 238 g

2.- Solve it using proportions

159.8 g of Bromine ------------ 238 g of potassium bromide

14.4 g of Bromine ------------ x

x = (14.4 x 238) / 159.8

x = 3427.2 / 159.8

x = 21.45g of KBr

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3 years ago

After 20 min, a reactant has decomposed to 85 % of its original concentration. Which order would the reaction need to be to allo

rjkz [21]

Answer : The value of rate constant is, $0.0949\text{ min}^{-1}$

Explanation :

First we have to calculate the rate constant, we use the formula :

Expression for rate law for first order kinetics is given by:

$k=\frac{2.303}{t}\log\frac{a}{a-x}$

where,

k = rate constant = ?

t = time passed by the sample = 20 min

a = let initial amount of the reactant = 100 g

a - x = amount left after decay process = 100 - 85 = 15 g

Now put all the given values in above equation, we get

$k=\frac{2.303}{20}\log\frac{100}{15}$

$k=0.0949\text{ min}^{-1}$

Therefore, the value of rate constant is, $0.0949\text{ min}^{-1}$

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2 years ago

How many grams of strontium (Sr, 87.62 g/mol) are in 2.92 moles of strontium?

kherson [118]

Mass= number of mole *Molar mass
mass =2.92 mol*87.62 g/mol≈256 g

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3 years ago

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