Answer:
the 1st and 4th one. index fossils r imprints and also it is individual animals making the print so it is unique
Reactions can occur because of a precipitation reaction
<h3>Further explanation</h3>
Double-Replacement reactions, happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product
To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur
Chloride solution reacts with Sodium carbonate solution
CaCl₂(aq)+Na₂CO₃(aq)⇒CaCO₃(s)+NaCl(aq)
Because Calcium carbonate, CaCO₃ an insoluble solid , it will precipitates so that a reaction can occur
The reaction would shift to the right (forward).
Balanced chemical reaction: Br2(g) + 2NO(g) ⇌ 2NOBr(g)
According to the Principle the position of equilibrium moves to counteract the change.
The equilibrium shift to the right, so more product (nitrosyl bromide) will be produced. If the product is removed, the reactants will react to produce that product and set equilibrium.
Concentration of the reactants (bromine gas and nitric oxide) is reducing, while concentration of product is increasing.
In a chemical reaction, chemical equilibrium is the state in which both reactants and products are present in concentrations which not change with time.
Speed of direct and irreversible chemical reaction are equal
More about principle: brainly.com/question/2943338
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Answer:
disposal of radioactive waste
Explanation:
if too much is released, it can wipe out large parts of the country
