All categories

3 years ago

The property of a substance stays ______________ no matter how the substance is used.

1 answer:

3 0

Any substance changes to another substance that means the change of the physical property. Like water () has different state which changes as the temperature changes. It remain as liquid in the room temperature, in solid form at or below 0°C and vapor phase on or above 100°C. But in all the stage or phase of the substance the composition of the water i.e. remains. Thus the chemical property remains fixed when a substance change to other substance.

You might be interested in

What is the relative rate of diffusion of hydrogen and nitrogen

vredina [299]

Answer:

2.645

Explanation:

Rate of diffusion formula:

Sqrt(mass2/mass1)

>>sqrt(14/2)

(Note:Hydrogen must exist in dwiatomic, [H2])

3 0

2 years ago

Calculate the density from the following information: A red block had a mass of 15.7 g. It was placed into a graduated cylinder

matrenka [14]

Answer:

Density should be 8.5

Explanation:

When you subtract 17.2-10.0 for water displacement you get 7.2 which is the volume and you divide it by 15.7 so your equation will be 15.7/7.2 = 8.5

4 0

3 years ago

If 0.025 gram of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting solution, in parts per m

anastassius [24]

Answer:

249.94ppm

Explanation:

Given parameters:

Mass of Pb(NO₃)₂ = 0.025g

Mass of water = 100g

Unknown:

Concentration of solution in ppm = ?

Solution:

Concentration in parts per million gives the amount of solute found in a million units of the solution. They are desirable for expressing very small amount of solutes in a large solution. For example, the level of arsenic in the soil.

Concentration in ppm = $\frac{amount of solute}{amount of solution} x 10^{6}$

A solution is made up of solute and solvent. The solvent here is water.

mass of solution = mass of solute + mass of solvent = 0.025 + 100 = 100.025g

Concentration in ppm = $\frac{0.025}{100.025} x 10^{6}$ = 249.94ppm

4 0

3 years ago

The protons account for about half the mass of most elements. Protons are located in the atomic nucleus along with the neutrons

Lady_Fox [76]

Answer:

Explanation:

The electrical charge on protons are positive charges.

Protons are subatomic particles and they carry positive charges on them. In all instances, they are found in the tiny nucleus along with neutrons.

Both protons and neutrons contributes the bulk mass of an atom whereas electrons is negligible and inconsequential to the mass of the atom.

Electrons carry negative charges within an atom with a charge of -1
Neutrons are uncharged subatomic particles.
Protons carry positive charges, +1

7 0

3 years ago

PLS HELP If i don't pass this im screwd.

Lera25 [3.4K]

Answer:

i dont know...

Explanation:

4 0

3 years ago