A physical property is an aspect of matter that can be observed or measured without changing it. A chemical property may only be observed by changing the chemical identity of a substance.
Answer:
D. two-stroke cylinder engine.
Explanation:
<u>Two-stroke cylinder engine:</u> In chemistry, the term "two-stroke cylinder engine" is described as one of the types of "internal combustion engine" that tends to complete a single "power cycle" possessing two different strokes of the "piston" during a particular "crankshaft revolution".
<u>It generally</u> consists of two different strokes that are being often known as power or exhaust and suction stroke.
<u>In the question above, the given statement signifies the "two-stroke cylinder engine". </u>
Answer:
The answer to your question is pH = 5
Explanation:
Data
[H⁺] = 1 x 10⁻⁵
pH = ?
pH is a measure of the hydrogen concentration. It measures the acidity or alkalinity. The range of pH goes from 0 to 14. The pH for an acid is from 0 to 6.9, for a neutral solution is 7.0 and for an alkali is from 7.1 to 14.
Formula
pH = -log [H⁺]
-Substitution
pH = -log [1 x 10⁻⁵]
-Simplification
pH = - (-5)
-Result
pH = 5
Large minerals are created from magma, when magma rises to the Earth's surface it cools slowly. As the magma cools, solid rocks form. Rocks are mixtures of minerals. Granite is a common rock that forms when magma cools. It contains the minerals quartz, plagioclase feldspar, and potassium feldspar. The different colored speckles in the granite are the crystals of the different minerals. The mineral crystals are large enough to see because the magma cools slowly, which gives the crystals time to grow.
Small minerals are created from lava, since lava is on the Earth's surface so it cools quickly compared to magma on Earth. Hence, rocks form quickly and mineral crystals are very small. Sometimes, lava cools so hastily that crystals cannot form at all, forming a black glass called obsidian. Because obsidian is not crystalline, it is not a mineral.
NOTE: Minerals (and gems) are crystals.
Answer:
0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
Explanation:
Given data:
Moles of oxygen needed = ?
Moles of carbon present = 0.276 mol
Solution:
Chemical equation:
2C + O₂ → 2CO
Now we will compare the moles of carbon with oxygen.
C : O₂
2 : 1
0.276 : 1/2×0.276 = 0.138 mol
Thus, 0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
