Several natural products have been isolated from the flowering plant Sacrostemma acidum, which has been used in folk medicine as a cough suppressant.
Nаturаl products hаd been used by mаny cultures аnd trаditions from thousаnds of yeаrs for their bioаctive phаrmаcophores by modern phаrmаceuticаl compаnies. The potentiаl bioаctive phytocompounds such аs аlkаloids, flаvonoids, phenolic compounds, аnd steroids аre potentiаl source for drug discovery.
Sacrostemma acidum has been used in folk medicine as a cough suppressant. Acidum stem extrаct resulted in аn аrrest of spermаtogenesis without аny systemic side effect. Sperm motility аs well аs sperm density wаs reduced significаntly.
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b. cobalt
c. platinum
d. zinc
Answer:
a. Selenium
Explanation:
Hello,
Selenium is a crystalline non-metallic element that has variable properties depending on how it is prepared, but they are all hard solids. Zinc is less brittle than selenium since it has stronger metallic properties. On the other hand, cobalt and platinum are strong metals that are far away to be brittle.
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Answer:
The formula for molality is m = moles of solute / kilograms of solvent. In problem solving involving molality, we sometimes need to use additional formulas to get to the final answer. One formula we need to be aware of is the formula for density, which is d = m / v, where d is density, m is mass and v is volume
Explanation:
it is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.
Answer:
Explanation:
The difference between the molecule and compound is that molecule is made up of atoms of same element while compound is made up of atoms from different elements.
Molecule:
When the atoms of same elements combine they form molecule. In molecule atoms are combined together by covalent bond.
For example,
H₂ is the molecule of hydrogen in which two hydrogen atoms combined together through covalent bond.
Compound:
When the atoms of different elements combine they form compound. In compound atoms are combined through ionic bond.
For example,
NaCl is compound it is formed by the combination of atoms of sodium and chlorine. The electron form sodium is gained by the chlorine and form ionic bond.
2) A chemical change creates a new species.
Chemical change:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg .
The reaction of Hydrogen and oxygen:
H 2 (g) + O 2 (g) -------------------------------------> 2H2O
Answer:
The difference between a molecule and a compound is that a compound is made up of atoms from
✔ different elements
.
A chemical change creates a new
✔ substance
.Explanation:
precipitation
perception
Answer:
Precipitation
Explanation: