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Chlorine
Uranium
Ammonia
Among the substances listed, ammonia (NH3) is a compound. The option D (ammonia) is the correct option.
Compounds can have various physical forms, such as solids, liquids, or gases, depending on the specific elements and the nature of their chemical bonds. They can also exhibit a wide range of chemical and physical properties, such as melting point, boiling point, density, solubility, and reactivity.
Chemical formulas are used to represent compound substances, indicating the types and numbers of atoms present in a molecule of the compound. For example, the chemical formula for water is H2O, representing two hydrogen (H) atoms bonded to one oxygen (O) atom. Ammonia is composed of nitrogen (N) and hydrogen (H) atoms bonded together. Carbon (C), chlorine (Cl), and uranium (U) are elements rather than compounds.
Therefore, Ammonia which is option D is the correct option.
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Answer:
Ammonia
Explanation:
Ammonia is a inorganic compound that is made up of single nitrogen atom.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.
The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. The stoichiometry in the balanced chemical equation represents the number of moles of respective element.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
given number of atoms of copper =6×10⁶atoms
Substituting the values
mole of copper=6×10⁶÷ 6.022×10²³
moles of copper = 9.96×10⁻¹⁸moles
Therefore, 9.96×10⁻¹⁸moles of copper are in 6,000,000 atoms of copper.
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A chemical reaction by definition forms new chemicals (called the products) from the initial chemicals (called the reactants). It should make sense that the identity of the products formed depends on what reactants we start with. Adding an acid to a base is an example of a chemical reaction, so we should expect to see new products. Although there is a pattern to this type of reaction, ultimately the products formed depend on what acid and what base are used.
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The skeletal system of a human body is the only one that can get fossilized. The remains of ancient species are preserved as fossils. Body parts must typically be hard and able to be mineralized without losing their form or degrading in order to become fossilized.
Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.
In river valleys, cliffs, hillsides, and man-made exposures like quarries and road cuts, sedimentary rocks of the appropriate age are exposed, and these are the places where fossils are most frequently found.
The most typical kind of fossilization takes place quickly after an animal dies when it is buried under material, such sand or silt. Sedimentary deposits shield its bones from decaying.
Thus, The remains of ancient species are preserved as fossils.
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