Answer:
Explanation:
A physical change is a change in which the physical properties of matter are altered. These are properties are the forms and state.
Most physical changes are easily reversible and are pure state changes.
They do not lead to the production of new compounds.
They involve no mass change and requires little to no energy.
Examples are melting, boiling, freezing, sublimation e.t.c
Given:
Temperature = T, unknown
Saturated Solution, NH4Cl concentration = 60g/100g H2O = 0.6g NH4Cl/g H2O
Assume density of H2O = 1 g/ml
m = 0.6g NH4Cl/g H2O / 1 g/ml
m = 0.6g NH4Cl/ml
See the table of saturated solutions and identify the temperature at which the concentration of NH4Cl is 60g/100g H2O. <span />
The correct answer is: "3 (THREE)" .
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"HONC "
1 2 3 4
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In which "H" is the symbol for the element "hydrogen" ;
"O" is the symbol for the element "oxygen" ;
"N" is the symbol for the element "nitrogen" ;
"C" is the symbol for the element "carbon"
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And the number of bonds formed:
1, (for "H"); 2 (for "O"); 3 (for "N"); and 4 (for "C") .
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Stirring a solute<span> into a </span>solvent<span> speeds up the rate of </span>dissolving<span>. This is because it helps distribute the particles throughout the </span>solvent. <span>Three ways to make a solute dissolve faster in a solvent is the below:
</span><span> Heat it up
</span>Stir
Add catalyst
.
Oxygen-16 is the atom in question.
- Atomic number: 8.
- Mass number: 16.
<h3>Explanation</h3>
The superscript of the ion says "2-". That means that the ion here carries a charge of -2.
- The charge is negative, meaning that there are more electrons (which are negative) than protons (which are positive) in that ion.
- The size of the charge is 2. There are two more electrons than protons in that ion.
There are 10 electrons in total in that ion. There are two more electrons than protons. That means that there are 10 - 2 = 8 protons in that ion.
The atomic number of an atom is the same as its number of protons. The atomic number of X is 8.
The atomic number determines the element. Atomic number 8 is oxygen. Thus element X is oxygen.
Mass number is the sum of number of protons and neutrons in an atom. 8 + 8 = 16 for this atom.