Answer:
b) Conduction, convection, and radiation
Answer:
9. false
10. true
11. false
12. true
13. true
Explanation:
9. a Newton is the SI unit of force.
11. it says energy can't be created or destroyed
The pH of an aqueous solution with a hydrogen ion concentration of [H+]=1. 2×10^−8 m is 7.92.
The entire form of pH is potential of Hydrogen. pH is called the poor logarithm of H+ ion attention. hence the that means of the name pH is explained because the energy of hydrogen. pH describes the concentration of the hydrogen ions in a solution and it's miles the indicator of acidity or basicity.
pH is an important amount that reflects the chemical conditions of an answer. The pH can manage the provision of vitamins, organic features, microbial activity, and the conduct of chemical substances.
pH stands for capacity hydrogen and it's used to explain the acidity or alkalinity of a substance. The pH scale is measured from 1 to fourteen. 7 is impartial and the lower the quantity, the extra acidic and the higher, the greater alkaline.
explaination,
[H+]=1. 2×10^−8 m
log[h+] = 1. 2×10^−8 m
= 8 - log (1.2)
= 8 - 0.079
PH = 7.921
Learn more about pH here:-brainly.com/question/172153
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Answer:
hi
Explanation:
The mass of the actual tin will remain constant; however I assume you are comparing the mass of the reactant, tin, with the mass of the products. The increase in mass stems from the oxides of tin present due to its reaction with oxygen in the air:
Sn(s) + O2(g) → SnO2(s)
By working out the atomic mass of the tin and the relative formula mass of tin oxide, you can see why there is a mass increase; 119:151. As you can see here, for every 119g of tin reacted, there will be 151g of tin oxide, hence why you think the mass of the tin increased (by 32g).
Hope this helped!
Answer:
a. 0.31 g
Explanation:
- It is known that the decay of a radioactive isotope isotope obeys first order kinetics.
- Also, it is clear that in first order decay the half-life time is independent of the initial concentration.
- Half-life time is the time needed for the reactants to be in its half concentration.
- If reactant has initial concentration [A₀], after half-life time its concentration will be ([A₀]/2).
- The half-life time of the substance = 14 days.
<em>So, 70 days represent (70 days/ 14 days = 5.0 half-lives).</em>
<em />
- So, the substance will decay:
10 g → (first half-life = 14 days) 5 g → (second half-life = 28 days) 1.5 g → (third half-life = 42 days) 1.25 g → (fourth half-life = 56 days) 0.625 g → (fifth half-life = 70 days) 0.3125 g.
<em>So, the right choice is: a. 0.31 g.</em>
