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3 years ago

PLEASE HELP. WILL MARK BRAINLIEST SERIOUSLY CONFUSED HELLPPPP PLEASE

Chemistry

1 answer:

Yuri [45]3 years ago

6 0

Alright! Here are the answers:

1. C. Fluorine is more reactive than nitrogen because fluorine needs only one electron to fill its outermost shell.

2. Aluminum (Al)

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Which is a characteristic of atoms?

laila [671]

The characteristic of atoms is

They are the smallest units of matter

<u><em> Explanation</em></u>

Atoms are the smallest constituent units of matter and they have properties of chemical elements.

Atoms can not be broken by any chemical means.

Atoms of an elements combine together to form compound.

In addition atoms consist nucleus of positively charged protons, neutral neutrons with negatively charged electrons.

4 0

4 years ago

Read 2 more answers

2.643 grams of potassium butanoate (KCH3(CH2)2CO2 ) is fully dissolved in 50.00 mL of water, which is carefully transferred to a

lara [203]

Answer:

The pH of the solution is 4.69

Explanation:

Given that,

Mass of potassium = 2.643 grams

Weight of water = 50.00 mL

Weight of HCl=100.00 ml

Mole = 0.120 M

We know that,

$KCH_{3}(CH_{2})_{2}CO_{2}$ is a basic salt.

Let's write it as KY.

The acid $HCH_{3}(CH_{2}CO_{2})$ would become HY.

We need to calculate the moles of KY

Using formula of moles

$moles\ of\ KY=\dfrac{m}{M}\times1000$

$moles\ of\ KY=\dfrac{2.643}{126}\times1000$

$moles\ of\ KY=20.97\ m\ mole$

The reaction is

$KY+HCl\Rightarrow HY+ KCl$

The number of moles of KY is 20.98 m

initial moles = 20.98

Final moles $m=20.98-0.120\times100= 8.98$

We need to calculate the value of pKa(HY)

Using formula for pKa(HY)

$pKa_{HY}=-log Ka$

$pKa_{HY}=-log(1.5\times10^{-5})$

$pKa_{HY}=4.82$

We need to calculate the pH of the solution

Using formula of pH

$pH=pKa+log(\dfrac{[KY]}{[KH]})$

Put the value into the formula

$pH=4.82+log(\dfrac{8.98}{12})$

$pH=4,69$

Hence, The pH of the solution is 4.69

7 0

3 years ago

What volume of oxygen in liters at STP wpuld be required for the combustion of 17.0 grams PH3?

Lynna [10]

First, we need to state the chemical equation for the combustion of PH3

$4PH3\text{ + 8O2 }\to\text{ P4O10 }+6H2O$

And the mass of PH3 is 17.0 grams and we need to know the moles.

In the periodic table, the atomic mass of the P (phosphorus) is 31 and the atomic mass of the H (hydrogen) is 1.

So, you sum the mass of P to the mass of H multiplied by 3 and you obtain this:

$\text{mole}cu\text{lar weight of PH3=31}\cdot1+1\cdot3=34\text{ g PH3/mol}$

With this data, we can search the moles of PH3:

7 0

1 year ago

Bao + ........ --> BaCO3 + ......

scoray [572]

Explanation:

Bao + .....Co2... --> BaCO3 + ......

6 0

3 years ago

4. Base your answer to the following question on the elements in Group 2 on the Periodic Table. State, in terms of the number of

Zolol [24]

Answer:

The atomic radius of strontium is larger than magnesium because there are more number of shielding electrones in strontium than magnesium, which causes electron-electron repulsion, that makes the electrons in valance shell to expand. Hence it would decrease the effective nuclear charge.

5 0

2 years ago