Tag: properties of substances

Quizzes (0) Questions (115)

Questions Related to properties of substances

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

The hot air balloon rises because it is

  1. denser

  2. less dense

  3. equally dense

  4. the given statement is wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The hot air balloon has the hot air filled in it and the density of air is more than the hot air. So, the normal air or atmospheric air has the tendency to remain below than the hot air as the objects having the more density remains below than the objects having less density.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Brine has a density of $1.2  {g}/{cc}$. $40  cc$ of it are mixed with $30  cc$ of water. The density of solution is

  1. $2.11 {g}/{cc}$
  2. $1.11 {g}/{cc}$
  3. $12.2 {g}/{cc}$
  4. $20.4 {g}/{cc}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
given,  ${ \rho } _{ a }=1.2\quad 9/cc\quad \quad \quad { V } _{ a }=40cc$
                 ${ \rho } _{ b }=1g/cc\quad \quad \quad { V } _{ b }=30cc$

$ \rho _{mixture} = \dfrac { { \rho } _{ a }{ V } _{ a }+{ \rho } _{ b }{ V } _{ b } }{ { V } _{ a }+{ V } _{ b } } $

So  $ \rho _{mixture} = \dfrac { 1.2\times 40+1\times 30 }{ 40+30 } =\dfrac { 78 }{ 70 } $

        $\boxed { \rho _{mixture}=1.11\quad g/cc } $
Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

With the increase in temperature, the density of a substance, in general, ____________.

  1. increases

  2. decreases

  3. first increase then decreases

  4. first decrease then increases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Due to increase in temperature, objects vibrational energy increases resulting in decrease in density of the substance.

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

If the mass of a body is $12.1  g$ and the density is $2.2  {g}/{cc}$, its volume is

  1. $5.5 {cm}^{3}$
  2. $8 cc$
  3. $11 cc$
  4. $55 cc$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Density = $\dfrac {mass}{volume}$ 


 so volume =$\dfrac{mass}{density}$

hence volume =$\dfrac{12.1}{2.2} =5.5cc$

hence option (A) is correct

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

The density of a body is represented by the expression :

Where V is the volume and M is the mass of a body

  1. $D=\dfrac{V}{M}$
  2. D=M $ \displaystyle \times $ V
  3. $ D = \dfrac{1}{M \times V}$
  4. $ D = \dfrac{M}{V}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The density of a body is defined as the amount of mass contained per unit volume of the body.
Density = $\dfrac{mass}{volume}$ = $\dfrac{M}{V}$

so option (D) is correct
Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

In order to find the density of a solid we have to first know its :

  1. mass and area

  2. weight and area

  3. shape and volume

  4. mass and volume
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The density of a body is defined as the amount of mass contained per unit volume of the body.

$density=mass/volume$
So, we need mass and volume to find the density.
Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Equal volumes of iron and aluminum have different masses because they have different _________ .

  1. shapes

  2. densities

  3. lengths

  4. times
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If volume of iron = Volume of aluminium

then mass of iron > mass of aluminium
$\rho _{iron}\times V _{iron} > \rho _{aluminium}\times V _{aluminium}$
$\rho _{iron} > \rho _{aluminium}$

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

_______is the characteristic property of a substance.

  1. Density

  2. Velocity

  3. Temperature

  4. Displacement
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Density of a substance is a characterstic property of a substance defined as mass of the substance per unit volume.

density = $\dfrac { mass\quad of\quad the\quad substance }{ volume\quad of\quad the\quad substance } $

Multiple choice chemistry substances in the surroundings - their states and properties measurement of density properties of substances fundamental and derived units

Equal volumes of water and kerosene have equal masses. True or false.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mass of the water and kerosene depends on the volume and the density of the each. Since the water and kerosene have different densities, they will have different mass for the same volumes.


Therefore, the given statement is false.