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5 hours ago · Eukaryotic organisms (animals, plants, fungi and protists) store most of their DNA inside the cell nucleus as nuclear DNA, and some in the mitochondria as mitochondrial DNA or in chloroplasts as chloroplast DNA. In contrast, prokaryotes (bacteria and archaea) store their DNA only in the cytoplasm, in circular chromosomes.
5 hours ago · Examples of physical changes include melting ice, boiling water, shredding paper, and dissolving sugar in water. Each of these processes changes the appearance or state of the substance but doesn't change its chemical makeup. Freezing water into ice is a classic example of a physical change. The water changes from a liquid to a solid state, but ...
5 hours ago · Arsenic is the 53rd most abundant element in the Earth's crust, comprising about 1.5 parts per million (0.00015%). [43] Typical background concentrations of arsenic do not exceed 3 ng/m 3 in the atmosphere; 100 mg/kg in soil; 400 μg/kg in vegetation; 10 μg/L in freshwater and 1.5 μg/L in seawater. [44]
- metallic grey
- grey (most common), yellow, black (see Allotropes of arsenic)
5 hours ago · Abstract. Nanoparticles have gained significant attention recently for their potential applications in diagnosing and treating infectious diseases. Their unique properties, such as their small size, large surface area, and tunable surface chemistry, make them promising tools for targeted and effective approaches in disease management.
5 hours ago · Unfavorable reactions can be driven by highly favorable ones, as in the case of iron-sulfur chemistry. For example, this was probably important for carbon fixation. Carbon fixation by reaction of CO 2 with H 2 S via iron-sulfur chemistry is favorable, and occurs at neutral pH and 100 °C. Iron-sulfur surfaces, which are abundant near ...
5 hours ago · The physicochemical properties of the used adsorbent determine how well 2D-based materials can remove various contaminants. Common physicochemical characteristics that have a significant impact on pollutants’ adsorption include SSA, porosity, hydrophilicity, toxicity, stability, and the presence of various functional groups on adsorbent surfaces (Bilal et al., 2023).
5 hours ago · Ans: Examples are: hydrochloric acid, nitric acid and sulphuric acid. (ii) a weak base. Ans: Examples of weak acids include: acetic acid (vinegar), lactic acid, citric acid, and phosphoric acid. 15. List three categories of substances that can react with a base. Give one example of each and write the chemical reaction involved in each case.
