Answer:
Burning wood is a chemical change. Burning wood is an example of a chemical reaction in which wood in the presence of heat and oxygen is transformed into carbon dioxide, water vapour, and ash.
Baking an apple pie is a physical change because the apples in the pie start changing physically and the pie crust starts hardening and rising up.
Explanation:
Answer:
37.1 g of Arsenic
Explanation:
2.98 x 10^21 atoms of Arsenic x 74.92g/6.02 x 10^23
= 223.26 x 10^21/6.02 x 10^23
= 2.2326 x 10^23/6.02 x 10^23
= 37.1 g of Arsenic
Reactivity is the tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy.
A)
Part A: Given mass of NaCl * 1mol of NaCl/molar mass of NaCl = # of moles
17.45 g NaCl * 1 mole of NaCl /58.44 g NaCl = 0<em>.298 moles of NaCl</em>
Part B: First, let’s start with sodium, Na. To find the given mass of sodium, divide the given mass of NaCl (17.45)/the molar mass of NaCl(58.44) and multiply that by the molar mass of Na(22.99) to get the given mass of Na.
Given mass of Na * 1mol of Na/molar mass of Na= # of moles of Na.
6.864* 1mol Na/22.99 g Na=0.298 moles of sodium.
Repeat the above steps with chlorine.
Given mass of Na or Cl*1mol of Cl/molar mass of Cl = # of moles Cl.
10.58* 1mol Cl/ 35.45 g of Cl= <em>0.298 moles of chlorine.</em>
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Answer :
(1) act as a reducing agent and act as a oxidizing agent.
(2) act as a reducing agent and act as a oxidizing agent.
Explanation :
Reducing agent : It is defined as the agent which helps the other substance to reduce and itself gets oxidized. Thus, it will undergo oxidation reaction.
Oxidizing agent : It is defined as the agent which helps the other substance to oxidize and itself gets reduced. Thus, it will undergo reduction reaction.
(1)
In this reaction, 'I' is oxidized from oxidation (0) to (+5) and 'Cr' is reduced from oxidation state (+6) to (+3). Hence, act as a reducing agent and act as a oxidizing agent.
(2)
In this reaction, 'As' is oxidized from oxidation (+3) to (+5) and 'N' is reduced from oxidation state (+5) to (+3). Hence, act as a reducing agent and act as a oxidizing agent.