How do I identify significant figures in chemistry?

1 answer:

3 0

1) START counting for sig. figs. On the FIRST non-zero digit.

2) STOP counting for sig. figs. On the LAST non-zero digit.

3) Non-zero digits are ALWAYS significant.

4) Zeroes in between two non-zero digits are significant. All other zeroes are insignificant.

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Should industries releasing heavy metals into land and water ecosystem be penalized

sveta [45]

Yes, industries releasing heavy metals into land and water ecosystem be penalized.

Heavy metals are defined as the metals with high density in comparison to water, and presumably, linked with toxicity. The sources of heavy metals other industries include mining activities, waste dumps, untreated sewage etc.

Heavy metals are associated with numerous health issues and thus, are considered dangerous. World Health Organization has set limit on Heavy metals in drinking water. The limits are 3.0 milligram/liter for Zinc, 0.010 milligram/liter for Lead, Arsenic, Mercury and 0.003 milligram/liter for Cadmium.

Heavy metals are associated with disorders concerning gastrointestinal tract, respiratory organs, pulmonary organs, liver and brain. Thus, their discharge into water bodies results in direct or indirect consumption via aquatic food, water absorption by plants etc. The waste from industries should be treated before discharging into land or water bodies. Hence, the industries should definitely be penalized, if releasing heavy metals into land and water ecosystem.

Learn more about industrial waste generation and it's treatment-

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2 years ago

AL2O3 and ZNO are which oxides

Nesterboy [21]

Answer:

<em><u>Metal oxides</u></em>

Explanation:

Al2O3, ZnO and SnO are typical amphoteric oxides. Metal oxides are usually basic and they react with acids to form their respective salts

6 0

3 years ago

Calculate the average mass for iron. 15.2% iron-55, 85.8% iron-56

Roman55 [17]

Answer:

Iron 55 (Fe-55) is the iron isotope whose nucleus consists of 26 protons and 29 neutrons. It is a radioisotope that disintegrates by electron capture in manganese 55.

Explanation:

i hope this helps if not tell me

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3 years ago

__Fe + ___ Cl2 --> ___FeCl3

bija089 [108]

The coefficient of Fe is 2, Cl is 2, and product would be 2 as well.

Answer is 2.

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Atoms of which element contain 25 protons? magnesium (Mg) aluminum (Al) tin (Sn) manganese (Mn)

Rashid [163]

Manganese since the atomic number is 25

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4 years ago