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4 years ago

Which substance can't be broken down by chemical means?

1 answer:

5 0

Antimony cannot be broken down by chemical means because it is an element, a principle building block of matter. All other choices are compounds, which can be separated if put through enough stress to break the bonds between the atoms.

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A sample of methane (CH4) has a volume of 25 mL at a pressure of 0.80 atm. What is the volume of the gas at each of the followin

Xelga [282]

Answer:

a. 50ml b.10ml c. 6.097ml d. 190.1 ml

Explanation:

According to Boyle's law

Volume is inversely proportional to pressure at constant temerature

Mathematically

P1V1=P2V2

P1=Initial pressure=0.8atm

V1=Initial volume=25ml

making V2 the subject

at 0.4atm P2=0.4 atm,

V2=25×0.8/0.4

=50ml

at 2 atm V2=25×0.8/2

=10 ml

1mmHg=0.00131579

2500mmHg=3.28 atm

At 3.28 atm,V2=25×0.8/3.28

=6.097 ml

at 80.0 torr

1 torr=0.00131579

80 torr=0.1052 atm

at 0.1048 atm V2=25×0.8/0.1048

=190.1 ml

4 0

3 years ago

C6H5NH3Cl is a chloride salt with an acidic cation. If 46.3 g of C6H5NH3Cl is dissolved in water to make 150 mL of solution, wha

vaieri [72.5K]

<u>Answer:</u> The initial molarity of cation is 2.38 M

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Given mass of $C_6H_5NH_3Cl$ = 46.3 g

Molar mass of $C_6H_5NH_3Cl$ = 129.6 g/mol

Volume of solution = 150 mL

Putting values in above equation, we get:

$\text{Molarity of }C_6H_5NH_3Cl=\frac{46.3\times 1000}{129.6\times 150}\\\\\text{Molarity of }C_6H_5NH_3Cl=2.38M$

1 mole of $C_6H_5NH_3Cl$ produces 1 mole of $C_6H_5NH_3^+$ cation and 1 mole of $Cl^-$ anion

So, molarity of $C_6H_5NH_3^+$ cation = (1 × 2.38) = 2.38 M

Hence, the initial molarity of cation is 2.38 M

8 0

3 years ago

If the principal quantum number is n = 3, what are the name(s) of the subshells?

Ede4ka [16]

The name(s) of the subshells are s,p and d

<h3>Further explanation</h3>

Each orbital in an atom consists of 4 quantum numbers

n is the principal quantum number.

l is the angular momentum / azimuthal quantum number

ml, the magnetic quantum number

ms, the electron-spin quantum number

Value of n: positive integer

value of l: s = 0, p = 1, d = 2, f = 3 , ..(n-1)

ml value: between -l to + l

ms value: +1/2 or -1/2

n=3, then the possible value of l is a maximum of n-1 = 3-1 = 2

So the value of subshells = 0,1 and 2

8 0

3 years ago

Read 2 more answers

What is the empirical formula?

algol [13]

$Question$

What is the empirical formula?

Answer:

Hi, There!

,the empirical formula of a chemical is a simple expression of the relative number of each type of atom (called a chemical element)

Empirical formula is defined as the formula of a compound which gives the simple whole number ratio of the atoms of various elements present in one molecule of compound.

Hope this Helps!

$-FrozenVines-$

5 0

3 years ago

Consider the covalent bonding in the molecule acetylene [ah-SET-ihl-een], and assume that the carbon-carbon axis is the x-axis.

kirza4 [7]

Answer:

2py and 2pz orbitals

Explanation:

Each carbon atom still has two half-filled 2py and 2pz orbitals, which are perpendicular both to each other and to the line formed by the sigma bonds. These two perpendicular pairs of p orbitals form two pi bonds between the carbons, resulting in a triple bond overall (one sigma bond plus two pi bonds).

6 0

3 years ago