The chemical properties of organic molecules are determined by specific arrangements of atoms called _____________.

Answers

Answer 1

Answer:

Answer:

Functional group

Explanation:

Functional group is specific group of atom or bond associated to an organic compound that determines the chemical properties of that compound. This atom is bonded in a certain way or specific arrangement to give the compound a peculiar physical and chemical characteristics.

Functional group like the alkyl group -CH3 is found in organic compound series like the alkane family. The chemical properties specific to the alkyl group will be active in the compound of alkane family because of the presence of the functional group Alkyl(-CH3). The functional group also plays a major role in the chemical reactivity of the compound. For example the functional group of alkyl are often non reactive, this non reactive nature will definitely rub off on the chemical properties of the compound it is attached.

Functional group like -OH is usually found in Alcohol . Due to the presence of this functional group (-OH) alcohol possess a peculiar chemical properties. The compounds possess an hydrogen bond which invariably lead to the higher boiling points of the alcohol compounds. Other functional group can be bonds like double bond found in alkene compound or triple bond found in alkyne compound.

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An object has a density of 1.75 g/mL. Will it float on water? Why?

Answers

Answer:

The object will not float in water because the density of the object is greater than that of water.

Explanation:

Density of object = 1.75 g/mL

Density of water = 1 g/mL

The Density of the object is 1.75 g/mL and that of water is 1 g/mL. This implies that the object is denser (i.e heavier) than water. Therefore, the object will not float in water, rather it will sink in water since it's density is greater than that of water.

Scientists test a hypothesis by?

Answers

They test the hypothesis by experimentation.

What is the [H+] if the pH of asolution is 1.65?
a
[H+] = [ ? ] x 10!?)
Coefficient (green)
Exponent (yellow)
Enter

Answers

Solution:

$[\text{H}^(+)] = 10^{-\text{pH}}$

$[\text{H}^(+)] = 10^(-1.65)$

$\boxed{[\text{H}^(+)] = 2.2 × 10^(-2) \: M}$

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4.What is the volume of 50.0 g of calcium if the density of calcium is .50 g/mL?

Answers

Answer: The volume of calcium is 100 ml.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=(mass)/(Volume)$

Given : Mass of calcium= 50.0 grams

Density of calcium = $0.50g/ml$

Putting in the values we get:

$0.50g/ml=(50.0g)/(Volume)$

$Volume=100ml$

Thus the volume of calcium is 100 ml.

Volume = Mass / Density

50 / 0.5 = 100 ml

What is the mass/volume percent of a solution with 75g of Na2CO3 dissolved in 20.0 g of water?11%

9.3 %

30%

7.5%

Answers

Answer:

percent by mass = 79%

Explanation:

Data Given:

mass of solute (Na₂CO₃) = 75 g

mass of solvent ( water ) = 20 g

mass percent of solution = ?

Solution:

Formula used to find percent by mass

mass of solute / mass of solution x 100 . . . . . . (1)

first we have to find mass of solution

mass of solution = mass of solute + mass of Solvent . . . . (2)

put values in equation 2

mass of solution = 75 g + 20 g

mass of solution = 95 g

Now,

put values in equation 1

Percent by mass = mass of solute / mass of solution x 100

Percent by mass = 75 g / 95 g x 100

Percent by mass = 79 %

so,

The percent of the solution by mass = 79%

***Note:

The same work can be used for the other values too i.e. if you have 20 g of solute and 75 g solvent.

Answer:

The answer is 78.9%

Explanation:

The percentage weight in volume indicates the mass of solute per volume. We will use the% weight/volume formula to calculate what the exercise asks for, as follows: $%weight/volume=(solute weight)/(solution volume)x100%= (75 g)/(75+20)= 78.9%$

$percent Weight/volume=(solute weight)/(solution volume)x100=(75 g)/(75+20)x100=78.9$ %

What is the valency & molecular formula of sulphate?

Answers

Explanation:

Let's consider sulphate radical, the chemical formula is given by SO42−. Here we can see there is a -2 charge on SO4, which means it has -2 valency. Now look at the option (a), phosphate can be written as PO43−. There is -3 charge on PO4, that means it has -3 valency.

Explanation:

molecular formula of sulphate ion is SO₄²⁻

and

the valency of sulphate ion is 2.

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