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Igneous rocks are formed when liquid rock (magma underground, or lava on the surface) cools down and solidifies. If cooling is slow, usually underground, the minerals have time to form large, visible crystals, e.g. in granite. If cooling is faster, on the surface of the Earth, the crystals can usually only be seen with a microscope. Occasionally, the lava cools extremely rapidly, for instance when lava hits cold water, and there is no time for any crystal formation. This results in a volcanic glass such as obsidian.
Substances crystallize when their molecules arrange into repeating patterns, which results in a solid crystalline structure. Factors such as chemical composition, temperature, pressure, and impurities can influence whether a substance will crystallize or remain in an amorphous state. Substances with strong intermolecular forces tend to crystallize, while those with weak intermolecular forces or complex structures may not easily form crystals.
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A barrier that allows some substances in while keeping other substances out is said to be?
selectively permeable.
Are corrosive and alkaline both alkaline?
No, corrosive and alkaline are not the same. Alkaline substances have a pH greater than 7, while corrosive substances can cause damage or destruction through chemical reaction. Some corrosive substances can be alkalis, but not all corrosive substances are alkaline.
Are some substances are acid and alkaline at the same time?
No, a substance can either be acidic or alkaline, but not both at the same time. The pH scale ranges from 0 to 14, with 7 being neutral. Substances with a pH below 7 are considered acidic, while substances with a pH above 7 are alkaline.
Substances are divided into two classes?
Substances are divided into two classes: pure substances and mixtures. Pure substances are chemically uniform and cannot be separated by physical means, while mixtures are combinations of two or more substances that can be separated by physical processes.
Are all substances solid at 20 degrees celsius?
No, not all substances are solid at 20 degrees Celsius. The state of a substance at 20 degrees Celsius depends on its melting point and boiling point. Some substances, like water, are liquid at this temperature while others may be gases or solids.
A barrier that allows some substances in while keeping other substances out is said to be?
selectively permeable.
Why water dissolves anything?
Water does not dissolve everything. Some substances dont mix with water. Those are hydrophobic substances, ex: oil molecules
What is the skin of the cell body acts like a screen letting some substances pass in and out while blocking others?
The skin of the cell bodyl; acts like a screen,letting some substances pass in and out while blocking others
What are some substances that are filtered from the lymph while it is in lymph nodes?
abnormal bodys <3
Why do some substances with high pH burn your skin while substances of similar pH do not burn your skin?
The pH is not the only risk factor of a substance.
What term identifies the concept that some substances can move freely across a cell membrane while other substances must be carried across by proteins?
selective permeability
Does hydrophobic substances dissolve in water?
No, hydrophobic substances do not dissolve in water because they are repelled by water molecules. This is because hydrophobic substances are non-polar, while water molecules are polar, causing them to be incompatible.
What is a mineral an element or mixture?
A mineral is basically a mixture of different substances that consist of rocks (solid form) and some other things. While it is in its other form (liquid) it contains some useful substances such as zinc and etc.
A membrane that allows some substances to pass through while excluding others would be called?
selectively permeable
What is the cell membrane used for in the plant cell?
The Cell membrane on a plant cell is used to allow some substances into the cell (for nourishment) while keeping other (harmful or unwanted) substances out.
Is arbys gross?
some people like it while other dont, its a choice try it if you want but they dont look very satisfying
Do some membranes have proteins with chanels that allow for the passage of hydrophilic substances?
Yes, some membranes have protein channels called aquaporins that allow for the passage of hydrophilic substances like water across the membrane. These channels facilitate the movement of water molecules while excluding other substances.
