Answer: 30,000
Explanation: I'm taking gradpoint
B) 2HCL + Mg(OH)2 --> 2HOH + MgCl2
C) 2NaCl + H2SO4 --> Na2SO4 + 2HCl
D) Ca(OH)2 + Pb(NO3)2 --> Ca(NO3)2 + Pb(OH)2
I know the answer is A, but confused as to why that is. Can someone explain this for me? Thanks.
Answer:
Germanium.
Explanation:
In a neutral atom: the number of protons = the number of electrons.
Atomic number of a neutral atom = number of electrons = number of protons.
The element that has 32 protons in its nucleus is Germanium.
(2) 3.82 d (4) 34.38 d
Answer : The correct option is, (2) 3.82 d
Solution : Given,
As we know that the radioactive decays follow first order kinetics.
So, the expression for rate law for first order kinetics is given by :
where,
k = rate constant
t = time taken for decay process = 11.46 days
a = initial amount of the reactant = 200 g
a - x = amount left after decay process = 25 g
Putting values in above equation, we get the value of rate constant.
Now we have to calculate the half life of a radioisotope.
Formula used :
Putting value of 'k' in this formula, we get the half life.
Therefore, the half-life of a radioisotope is, 3.820 d
Answer:
Explanation:
Hello there!
In this case, according to the reaction between hypochlorous acid and strontium hydroxide which yields stontium hypochlorite and water as a neutralization reaction:
Thus, since HClO is a weak acid, it is not fully ionized so the complete ionic equation turns out to be:
Whereas the spectator ions, which remain the same at both sides of the equation, are:
Best regards!
A reaction occurs when HClO and Sr(OH)2 are mixed forming Sr(ClO)2 and H2O. In this reaction there are no spectator ions as all ions participate in the reaction forming new compounds.
When HClO (hypochlorous acid) and Sr(OH)2 (strontium hydroxide) solutions are mixed, a reaction takes place, resulting in the formation of Sr(ClO)2 and H2O. In this reaction, Sr2+ and OH- from Sr(OH)2 and H+ and ClO- from HClO are the ions that participate, therefore there are no spectator ions in the reaction. In the net ionic equation, spectator ions are the ions that remain the same in their ionic form on the both sides of the equation (reactant side and product side), thus, in this case, there are none. It's important to understand the concept of
solubility guidelines
and their use in determining reaction outcomes and recognizing
spectator ions
.
#SPJ3
B. kilometers
C. millimeters
D. centimeters
Answer:
The answer is C
Explanation:
Precision generally means been accurate (and can be loosely interpreted to mean been exact). Length is averagely measured in meters. However, in order to get the actual length of a substance using a tape, millimeters give the most accurate length (of all the options) as it provides the length to the smallest details (of all the options provided). The illustration below shows the relationship between millimeters and the rest of the options.
while 1 kilometer = 1000 meters
1 meter = 100 centimeters
1 centimeter = 10 millimeters
From the relationship above, millimeters is clearly the most precise of all the options provided.