Answer:
c) 40 (o), 35 (+), 34 (-)
Explanation:
Let us represent the element with P
Given information about the element:
Charge on P = +1
Mass number of P = 75
We can express the atom as ⁴⁵P¹⁺
The positive charge on the atom denotes that the atom has lost an electron. Electrons are negatively charge elementary particles in an atom. Therefore, the number of protons, positively charged particles are now more. This charge imbalance is what leaves atom P with a charge of +1. The difference between the proton number and number of electrons is just 1 and it represents a loss of an electron. Atoms that are not charged have their proton and electron number to be the same. Those that are negatively charge signifies that an electron has been gained and the number of electrons are greater than those of the protons.
The mass number 75 is the number of protons plus neutrons.
Option C gives the following information:
Neutron = 40
Protons = 35
Electrons = 34
Here Protons > Electrons with a difference of 1+.
Mass number = Protons + Neutrons =35 + 40 = 75
Archaea<span> and </span>bacteria are tiny, single-cell organisms which cannot be seen by the naked human eye. They are microbes and both prokaryotes. This means that they do not have a nucleus and lack membrane-bound organelles.
Protists on the other hand are small eukaryotes. They can<span> be unicellular or multicellular, but most of them are unicellular which is characteristic they share with the bacteria and archaea.
</span><span>- They transcribe sections of their DNA code into RNA, then translate this RNA into protein using complex structures called ribosomes.
</span><span>- Have cell membranes made of chemicals called phospholipids.
</span>- Have similar biochemical processes, for example the process glycolysis (the process <span>used to break down glucose).</span>
The amount of time it takes for 1/2 of it to decay or dissapear
this is liike compound interest because it takes the same amount of time to decay 1/2 of it, regardless of the amount
example
lets say half life of element x is 1 year
if yo has 32 grams, after 1 year, it decays to 16g
2 years decays to 8
3 years decays to 4
4 years decays to 2
5 years decays to 1
etc
hope this helps (I'm not the best at chem)
Answer:
Q1. D) A single replacement reaction takes place because sodium is more reactive than hydrogen.
Explanation: 
Sodium metal reacts with water to givesodium hydroxide and hydrogen gas. A single replacement reaction takes place because sodium is more reactive than hydrogen.
Sodium easily lose electrons than hydrogen and get oxidized to 
and 
get reduced to give 
.
Q2. B) It is a single replacement reaction, and the cations in the two ionic compounds are different.
Explanation: 
where Sodium is a metal and 
is an ionic compound. Na being more reactive than Al, displaces it from its salt solution.
Q3. D) 
Explanation: A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution.Thus zinc can easily lose electrons as compared to hydrogen and result in the formation of zinc sulfate and hydrogen.
Q4. False
no reaction
Explanation: As zinc lies lower in reactivity series, it is less reactive than calcium. It will not be able to displace calcium from its salt and hence no reaction occur. Thus the given statement is false.
Q5. False
Explanation: A double displacement reaction is one in which exchange of ions take place. Thus an element replaces another element and not same element.
A single replacement reaction is one in which a more reactive element displaces a less reactive element from its salt solution. Thus one element should be different from another element.
Q6. A)
, because K retains the same charge throughout the reaction
Explanation: A balanced chemical reaction is one in which the number of atoms on both sides of a chemical equation are same. Also K has an oxidation state or charge of +1 in 
as well as 
The theoretical yield of aspirin is <u>1.23 g</u>
Aspirin is a common drug with many uses. It relieves pain and reduces the risk of serious problems such as heart attack and stroke. It comes in many forms, including:
It is important to remember that aspirin alone does not lower blood pressure. However, its ability to thin the blood may benefit some people with high blood pressure.
moles of salicylic acid = mass / molar mass
=> 0.9457 / 138.2 = <u>0.006843 mol</u>
Acetic anhydride is in excess. Thus salicylic acid is the limiting reactant.
Total moles of aspirin that can form = moles of salicylic acid = 0.006843
mass of aspirin = number of moles of aspirin x molar mass of aspirin
= 0.006843 mol x 180.16g/mol = 1.23g
Thus theoretical yield of aspirin = 1.23 g
Learn more about aspirin here:-brainly.com/question/13533428
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