The main function of the respiratory system is to –
2 answers:
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Answer:
v = 2.141 ml
Explanation:
we can use the "ideal gas law" :-
<h2> PV=nRT </h2>p :- pressure ( pa )
V :- Volume ( m³ )
n :- amount of substance ( mol )
R :- Ideal gas constant ( 8.314 Jmol-¹ K-¹ )
T :- Temperature ( K)
Answer : The correct symbol and charge for each of the ions must be and
.
Explanation :
- Covalent compound : It is defined as the compound which is formed by the sharing of electrons between the atoms forming a compound.
The covalent compound are usually formed when two non-metals react.
- Ionic compound : It is defined as the compound which is formed when electron gets transferred from one atom to another atom.
Ionic compound are usually formed when a metal reacts with a non-metal.
As we know that the sodium chloride is an ionic compound in which sodium is an alkali metal and has one valence electron and chlorine is a non-metal and has 7 valence electrons.
When sodium atom donates an electron to a chlorine atom then it forms an ionic compound that is sodium chloride (NaCl) and the resulting positive ion and negative ion
form a stable ionic compound.
Hence, the correct symbol and charge for each of the ions must be and
.
Answer : The mass of the water in two significant figures is,
Explanation :
In this case the heat given by the hot body is equal to the heat taken by the cold body.
where,
= specific heat of iron metal =
= specific heat of water =
= mass of iron metal = 32.3 g
= mass of water = ?
= final temperature of mixture =
= initial temperature of iron metal =
= initial temperature of water =
Now put all the given values in the above formula, we get
Therefore, the mass of the water in two significant figures is,