Answer:
19.6 g is the mass of methanol
Explanation:
Density of methanol is 0.787 g/mL.
Density means mass / volume
Methanol density = Methanol mass / Methanol volume.
Let's replace in the formula
0.787 g/mL = Methanol mass / 25 mL
0.787 g/mL . 25 mL = Methanol mass → 19.6 g
Answer:
Answer is option D.
The terms vitrification, oxidation, water smoking, and flashing are all associated with firing bricks in a kiln.
Explanation:
Brick is one of the building materials made from the clay. The manufacturing process of brick include;
1) Winning - It is the process of mining of clay and its transportation to the manufacturing site.
2) Preparation - It includes the crushing and grinding of clay and later mixing them into a uniform raw material.
3) Forming/Molding - It is the process of mixing water with the clay mix and mold it into the desired shape. The plasticity of the clay depends on the amount of water used.
4) Drying - The process of removing the moisture from wet clay by drying it through evaporation.
5) Firing and Cooling - Firing is the process of burning the clay in a kiln and it usually requires 40 - 150 hours. The different stages in firing are;
- Water smoking or dehydration stage - It is a process in which free water retained in the pores of the clay after drying gets evaporated under a high temperature of 400-650°C and the clay loses its plasticity. Some of the carbonate minerals are eliminated.
- Oxidation - This process occurs at a very high temperature of 650-900°C in which the ferrous iron is oxidized to the ferric form and the remaining carbon is eliminated.
- Vitrification- This process occurs at a very high temperature of 900- 1100°C for low melting clay and 1000-1250°C for high melting clay, where the clay is transformed into a soft molten mass as a result of an increase in temperature. It gradually loses the shape and transforms into a glassy structure after cooling.
- Flashing - In this process, the fire in the kiln is regulated in such a way that it causes a reduction in the kiln temperature and the cooling process begins which produces color variations in bricks.
6) Drawing - It is the process involving the unloading of the kiln after cooling and packing of the bricks for further shipment.
Answer:
0.075 M
Explanation:
5Fe²⁺(aq) + MnO₄⁻(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(ℓ)
Using the moles of Fe²⁺ that reacted, we can <em>calculate the reacting moles of MnO₄⁻</em>:
0.0450 mol Fe⁺² * = 0.0090 mol MnO₄⁻
Now we divide the moles of MnO₄⁻ by the volume in order to <u>calculate the molarity of the solution</u>, keeping in mind that 120.0 mL = 0.120 L.
0.0090 mol MnO₄⁻ / 0.120 L = 0.075 M
Answer:
1. A solid has a definite volume and a shape.
2. Liquids take on the shape of their container and will fill the lowest portion of the container, taking on the shape but not the volume.
3. It may take extreme temperature, pressure or energy but all the matter can be changed.
4. Through sublimation, a substance changes from a solid to a gas without even passing through the liquid phase.