Answer:
A. They must be kept separate from moisture and oxygen
Explanation:
Alkali metals refers to a group of chemical elements in the periodic table. It is the common name given to Group 1 elements (excluding hydrogen). They are generally metallic in nature with physical properties like shining lustre, silvery in appearance etc. Alkali metals include lithium, Pottasium, Sodium, Rubidium etc.
One important chemical property of alkali metals is their high reactivity i.e. they tend to react quickly with other substances. For example, alkali metals react vigorously with water to form hydroxides. They also react with oxygen to form oxides. Due to this highly reactive properties, they are kept or stored away from moisture (water) and oxygen (present in air).
Answer:
A solution, in science, refers to a type of mixture involving two or more substances. Specifically, the solution definition refers to a type of homogeneous mixture - i.e., a mixture that has a uniform composition and its individual components cannot be distinguished
Answer:
Scientific Notation: 3.45 x 10^5
E Notation: 3.45e5
Explanation:
Answer:
1- The components in a series circuit are arranged in a single path from one end of supply to another end. However, the multiple components in a parallel circuit are arranged in multiple paths where the two end terminals of the battery.
2- In the series circuit, different voltage exists across each component in the circuit. Whereas in the parallel circuit, the same voltage exists across the multiple components in the circuit.
3- The equivalent resistance in case of a series circuit is always more than the highest value of resistance in the series connection. While the equivalent resistance in the parallel circuit is always less than any of the individual resistances in parallel combination.
4- A fault in one of the components of the series circuit causes hindrance in the operation of a complete circuit. As against fault in a single component in a parallel network do not hinder the functioning of another part of the circuit.
The detection of a fault in case of a series circuit is difficult, but it is quite easy in parallel circuits.
Answer:
water pulling a compound apart and then surrounding the broken pieces/ions (this is what dissolving is)
Explanation:
As we know, water is a polar solvent. What this means is that water can effectively interact with ions in an ionic substance owing to its large dipole moment.
Now, when an ionic substance is dissolved in water, the positive end in water pulls hard on the negative ion of the ionic substance while the negative end in water pulls hard on the positive ion of the ionic substance.
The ionic substance is eventually pulled apart and surrounded by water molecules. This is how an ionic substance is dissolved in water.