Explanation:
In a chemical reaction, the atoms do not change (like in radioactive reactions) but merely rearrange themselves to form new compounds by creating new bonds between atoms. If the bonds are of a lower energy state, this will be favoured in a chemical reaction because chemical reaction always seeks products with the lowest Gibbs free energy. Therefore spontaneous reactions will usually be those chemical reactions whose products are of a lower energy state than the reactants. These chemical reactions usually don’t need high activation energies to ‘jumpstart’ them.
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Answer: There are four atoms
Explanation: mass of Cl atom is 35.45 amu
Amount of atoms n = m/M = 142 / 35.45 = 4
Answer:
B. Na and Li
Explanation:
Only lithium and Sodium will have similar properties based on their groupings in the periodic table.
The periodic table of elements shows the arrangement of elements based on their atomic number.
- As general rule, elements in the same group on the periodic table will have the same chemical properties
- This is because they have the same number of valence electrons.
- Valency of an atom determines the chemical properties of such atom.
Scientists are able to understand Earth's interior by studying seismic waves. These are waves of energy that travel through Earth, and they move similarly to other types of waves, like sound waves, light waves, and water waves.
Answer:
c.mountain ranges
Explanation:
scientists wondered how they where formed and came to the conclusion that they might be forced upward by movement of the earths crust