Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Which gas can extinguish burning candle?
The gas that can extinguish a burning candle is carbon dioxide (CO2). When carbon dioxide is introduced near a burning candle, it displaces the oxygen (O2) in the surrounding air. Since combustion (burning) requires oxygen as one of its essential components, the reduced oxygen concentration caused bRead more
The gas that can extinguish a burning candle is carbon dioxide (CO2). When carbon dioxide is introduced near a burning candle, it displaces the oxygen (O2) in the surrounding air. Since combustion (burning) requires oxygen as one of its essential components, the reduced oxygen concentration caused by the presence of carbon dioxide can lead to the extinguishing of the flame. This is why carbon dioxide is often used in fire extinguishers to put out fires.
See lessWhy is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?
Damage to the ozone layer is a cause for concern because the ozone layer helps protect life on Earth from harmful ultraviolet radiation from the sun. When the ozone layer is depleted, more ultraviolet radiation can reach the Earth's surface, which can have a range of negative effects, including: IncRead more
Damage to the ozone layer is a cause for concern because the ozone layer helps protect life on Earth from harmful ultraviolet radiation from the sun. When the ozone layer is depleted, more ultraviolet radiation can reach the Earth’s surface, which can have a range of negative effects, including:
Increased skin cancer rates and other health effects in humans and animals
Reduction in crop yields and disruption of marine food chains
Degradation of materials such as plastics and paints
Impact on atmospheric and weather patterns
To limit damage to the ozone layer, the international community came together to negotiate and sign the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987. This treaty aimed to phase out the production and use of ozone-depleting substances (ODSs), such as chlorofluorocarbons (CFCs) and halons. As a result of the protocol, the production and consumption of ODSs has been significantly reduced, and the ozone layer is showing signs of recovery.
In addition to the Montreal Protocol, other steps are being taken to limit damage to the ozone layer, including:
Research and monitoring: Scientists continue to study the ozone layer and its depletion, and monitoring networks have been established to track changes in ozone levels.
Alternative technologies: Industries have developed and implemented alternative technologies to replace ODSs, such as using hydrofluorocarbons (HFCs) in refrigeration and air conditioning systems.
Public awareness and education: Governments and organizations have worked to educate the public about the importance of the ozone layer and how to reduce their use of ozone-depleting substances.
Overall, while there is still work to be done to fully restore the ozone layer, the steps being taken have made a significant impact and demonstrate the potential for international cooperation to address global environmental challenges.
See lessIf all the waste we generate is biodegradable, will this have no impact on the environment?
Even if all the waste we generate is biodegradable, it can still have an impact on the environment if it is not properly managed. Here are some potential issues that can arise: Land use: Biodegradable waste that is not properly managed can take up space and use up land, as it must be placed in landfRead more
Even if all the waste we generate is biodegradable, it can still have an impact on the environment if it is not properly managed. Here are some potential issues that can arise:
Land use: Biodegradable waste that is not properly managed can take up space and use up land, as it must be placed in landfills or other disposal sites. This can impact ecosystems and habitats.
Methane emissions: When biodegradable waste breaks down in landfills, it can produce methane, a potent greenhouse gas. Methane emissions contribute to climate change and can have significant environmental impacts.
Soil and water pollution: If biodegradable waste is not properly managed, it can leach into the soil or water and cause pollution. This can impact plant and animal life and human health.
Resource use: Properly managing biodegradable waste often requires resources, such as energy to transport and process the waste. These resources can have environmental impacts and contribute to climate change.
Therefore, while biodegradable waste is generally less harmful than non-biodegradable waste, it is still important to properly manage and dispose of it to minimize its impact on the environment. This can include practices such as composting, recycling, and reducing waste.
See lessWhat is the role of DNA in biology?
DNA (deoxyribonucleic acid) is a molecule that plays a central role in the biology of all living organisms. DNA carries the genetic information that determines the traits and characteristics of an organism, and it is responsible for the transmission of this information from one generation to the nexRead more
DNA (deoxyribonucleic acid) is a molecule that plays a central role in the biology of all living organisms. DNA carries the genetic information that determines the traits and characteristics of an organism, and it is responsible for the transmission of this information from one generation to the next. Some of the key roles of DNA in biology include:
Information storage: DNA serves as a blueprint for the development and function of an organism, encoding the instructions for the synthesis of all the proteins that perform the various functions of the cell.
Gene expression: The information stored in DNA is used to control the expression of genes, which determines when and how much of a particular protein is produced.
Evolution: The genetic information stored in DNA is subject to change over time through processes such as mutation and natural selection, which drive evolution and the adaptation of organisms to their environment.
Diagnosis and treatment of genetic disorders: By studying the DNA of individuals with genetic disorders, scientists can identify the genetic mutations that cause these disorders, which can lead to the development of new diagnostic tools and treatments.
Agriculture and biotechnology: DNA research has also led to the development of new technologies for the improvement of crops and animals, as well as the production of new medicines and other products.
In short, DNA is a critical component of the biology of all living organisms, and its study has led to many important discoveries and advances in the field of biology and related sciences.
See lessExplain the following in terms of gain or loss of oxygen with two examples each.
(a) Oxidation is a chemical process in which a substance gains oxygen atoms, or in which the number of atoms of another element in a compound decreases as the result of a reaction. Here are a few examples of oxidation: The rusting of iron: When iron is exposed to oxygen and moisture, it reacts withRead more
(a) Oxidation is a chemical process in which a substance gains oxygen atoms, or in which the number of atoms of another element in a compound decreases as the result of a reaction. Here are a few examples of oxidation:
The rusting of iron: When iron is exposed to oxygen and moisture, it reacts with the oxygen to form iron oxide (also known as rust). This is an example of oxidation, as the iron gains oxygen atoms during the reaction.
The combustion of propane: When propane is burned, it reacts with oxygen to produce carbon dioxide and water. This is an example of oxidation, as the propane is gaining oxygen atoms during the reaction.
(b) Reduction is a chemical process in which a substance loses oxygen atoms, or in which the number of atoms of another element in a compound increases as the result of a reaction. Here are a few examples of reduction:
The reduction of copper oxide: When copper oxide is heated in the presence of hydrogen gas, it reacts to form copper and water. This is an example of reduction, as the copper oxide is losing oxygen atoms during the reaction.
The reduction of nitrate ions: When nitrate ions (NO3-) are reduced, they are converted to nitrite ions (NO2-). This is an example of reduction, as the nitrate ions are losing oxygen atoms during the reaction.
See lessA shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
Copper is a shiny, brown-colored metal that is often used in electrical wiring and other applications. When heated in air, copper reacts with oxygen to form a black-colored compound called copper oxide (CuO). Copper oxide is a solid, black-colored substance that is often used as a pigment in paints,Read more
Copper is a shiny, brown-colored metal that is often used in electrical wiring and other applications. When heated in air, copper reacts with oxygen to form a black-colored compound called copper oxide (CuO). Copper oxide is a solid, black-colored substance that is often used as a pigment in paints, inks, and other products.
Here is the chemical reaction that occurs when copper is heated in air:
Cu + O2 → CuO
I hope this helps! Let me know if you have any other questions
See less