Because it takes a lot of work to make a core solid
A homogeneous mixture<span> has the same uniform appearance and composition throughout. Many homogeneous </span>mixtures<span> are commonly referred to as </span>solutions<span>. A </span>heterogeneous mixture <span>consists of visibly </span>different<span> substances or phases. The three phases or states of matter are gas, liquid, and solid.</span>
The 2, written as a subscript, counts for only the hydrogen. 3 H2O has 6 atoms of H and 3 atoms<span> of O. The 3, written as a coefficient, means that there are 3 “H2O”s.</span>
<span>Mg(OH)2 has </span>1 atom<span> of Mg, 2 atoms of O, and 2 atoms of H.</span>
Answer: Option (C) is the correct answer.
Explanation:
A reaction in which two or more reactants combine to result in the formation of a single product is known as a synthesis reaction.
For example, is a synthesis reaction.
Whereas the number of moles of either nitrogen or oxygen is not given. Therefore, we cannot tell which reactant is in excess or not.
Thus, we can conclude that the statement, this is a synthesis reaction is the true statement.
Answer:
222.3 ml of a 0.130 M aqueous solution of chromium (II) nitrate must be taken to obtain 5.08 grams of the salt.
Explanation:
Being:
- Cr: 52 g/mole
- N: 14 g/mole
- O: 16 g/mole
the molar mass of chromium (II) nitrate, Cr(NO₃)₂ is:
Cr(NO₃)₂ = 52 g/mole + 2* (14 g/mole + 3* 16 g/mole)= 176 g/mole
So: if 176 grams are present in 1 mole of the compound, 5.08 grams in how many moles of the compound will be present?
amount of moles=0.0289 moles
Molarity (M) is the number of moles of solute that are dissolved in a given volume. It is then calculated by dividing the moles of the solute by the volume of the solution:
Molarity is expressed in
So in this case:
- molarity= 0.130 M
- number of moles of solute= 0.0289 moles
- volume= ?
Replacing:
Solving:
volume=0.2223 liters
Being 1 L= 1,000 mL:
volume=0.222 liters= 222.3 mL
<u><em>
222.3 ml of a 0.130 M aqueous solution of chromium (II) nitrate must be taken to obtain 5.08 grams of the salt.</em></u>