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Explain why the surface of some metals acquire a dull appearance when exposed to air for a long time support it with three examples?
The surface of some metals acquires a dull appearance when exposed to air for a long time due to the formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of the various gases present in air.
What else can I help you with?
Elemental calcium and magnesium metal are shiny when they are pure if the metals you worked with were not shiny explain why this was so?
They were exposed to and reacted with oxygen in the air.
What do the alkali metals look like when the oil is removed and a freshly cut surface exposed?
Alkali metals such as lithium, sodium, and potassium are shiny and metallic in appearance when the oil coating is removed and a freshly cut surface is exposed. They have a silvery-white color and are highly reactive with air and moisture, so they tarnish quickly when exposed to oxygen.
Is gallium shiny?
Yes, gallium has a shiny appearance similar to shiny metals like aluminum. However, its shiny surface can tarnish quickly when exposed to air.
What happens to the pewter over time if it is exposed to air?
Pewter exposed to air can tarnish and develop a dull appearance due to oxidation. It may also accumulate a patina, which forms as a protective layer over time. Regular cleaning and maintenance can help preserve the shine and finish of pewter items.
Is starch solution transparent?
Yes, starch solution is typically transparent when it is freshly prepared. However, when heated or exposed to certain conditions, it can change to a translucent or opaque appearance due to gelatinization or retrogradation.
What would the appearance of crystals in medication indicate?
The medication has been exposed to cold
What is calciums appearance?
it is a silver substance.and has grayish white when exposed to air.
What are the benefits of choosing exposed aggregate concrete for a patio?
Exposed aggregate concrete for a patio offers benefits such as durability, slip resistance, low maintenance, and a decorative appearance.
What nutrients function to prevent the appearance of bilateral symmetrical dermatitis primarily on areas exposed to the sun?
Niacin
What does the language acquisition device lad explain?
The Language Acquisition Device (LAD) is a theoretical concept introduced by Noam Chomsky to explain how children have an innate ability to acquire language. According to Chomsky, children are born with a cognitive mechanism that allows them to quickly and effortlessly learn the grammar and rules of any language they are exposed to during their critical period of language development.
Examples of directional hypothesis?
Students exposed to process-oriented writing techniques perform better than students exposed to product-oriented technique.
How can you explain the evidence that different rock layers are exposed at river level at these two sites?
mierda
How can you explain the evidence that different rock layers are exposed at river levels at these two sites?
mierda
How does the factors affect evaporation explain?
- vapours tension- temperature- pressure- area exposed to atmosphere
Examples of crenation?
Crenation occurs when animal cells are exposed to a hypertonic solution, causing shrinkage, distortion, and often leave a scalloped appearance to the edge of the cell. A common reason for crenation in red blood cells is dehydration. It is also seen when pickling and salt-curing foods.
Where can you find examples of ersion due to acid rain?
places with exposed limestone or other calcium based rocks. acid rain reacts with the calcium producing fizzing and the rock dissolves. examples would perhaps be much of Yorkshire and exposed chalk such as around dover
How did cooling the vanilla pudding uncovered affect its appearance?
Cooling the pudding uncovered leaves it exposed to harmful chemicals in the air, and is exposed to moisture in the air. Therefore it can get disgusting, and watery, yet still eatable - Brittany Campbell
