Answer:
1. nitric acid: sa
2. perchloric acid: sa
3. hydrofluoric acid: wa
Explanation:
A strong acid (sa) is the one that is completely dissociated into ions in water. Conversely, a weak acid (wa) is not completely dissociated in water.
From the options, the strong acids are:
1. nitric acid (HNO₃). It dissociates completely into ions when is dissolved in water, as follows:
HNO₃ → H⁺ + NO₃⁻
2. perchloric acid (HClO₄). It is completely dissociated in water as follows:
HClO₄ → H⁺ + ClO₄⁻
The weak acid is hydrofluoric acid (HF). In water, only a small proportion is dissociated into ions. The proportion of ions formed is given by the equilibrium constant Ka. The dissociation is written by using double arrows:
HF ⇄ H⁺ + F⁻
Red blood cells carry a specific type of protein, called hemoglobin, which is able to bind oxygen and release it in other tissues. A nerve cell doesn't have this protein because it doesn't need to bind oxygen. Instead, the nerve cell uses other proteins that help it transmit signals to other cells.
That is copied from “gene expression” article
But all in all, the cells have different structures and different jobs. This means that they are produced for that one job and cannot be made to do another job that they aren’t specifically made for. As well the dna make up will produce these cells specifically and in different cells than the other.
Hopefully this helps some. Have a nice day!
A triangular shaped body of water that forms where a stream in to the larger body of water is a delta.
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Explanation:
- Combination or synthesis reaction
- Decomposition or cracking reaction
- Single replacement or single displacement
A combination or synthesis is a type of reaction that involves the formation of a single product from tow or more reactants:
K + J → KJ
The formation of a single compound form the union of their constituent element falls into this category of reaction.
The large and negative heat of formation is the driving force for this reaction.
A decomposition or cracking reaction is one in which two or more products are formed from a single reactant:
TK → T + K
The breaking down o a compound into its individual components like elements and other compounds falls into this category.
The driving force for this type of reaction is the high positive heat of formation and instability of the compound.
A single replacement or single displacement reaction is one in which a substance is replacing another.
TO + P → TP + O
The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in a solution falls into this category of reaction.
learn more:
Chemical reaction brainly.com/question/6281756
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Answer is: number of atoms in a copper rod is 2.89·10²⁴.
r(Cu) = 1.05 cm; radius of copper rod.
l(Cu) = 9.85 cm; lenght of copper rod.
V(Cu) = r²(Cu) · π· l(Cu).
V(Cu) = (1.05 cm)² · 3.14 · 9.85 cm.
V(Cu) = 34.1 cm³, volume of copper rod.
m(Cu) = d(Cu) · V(Cu).
m(Cu) = 8.96 g/cm³ · 34.1 cm³.
m(Cu) = 305.53 g; mass of copper.
n(Cu) = m(Cu) ÷ M(Cu).
n(Cu) = 305.53 g ÷ 63.55 g/mol.
n(Cu) = 4.81 mol; amount of substance.
N(Cu) = n(Cu) · Na (Avogadro constant).
N(Cu) = 4.81 mol · 6.022·10²³ 1/mol.
N(Cu) = 2.89·10²⁴.
