A common clasiffication of the chemical reactions is as combination (or synthesis), decomposiion, single replacement and double replacement. Knowing the reactants and products you can tell to which one of those four classifications a reaction pertains. When two reactants combine into a single product, it is a combination (syntheisis) reaction. When a single reactant yields two or more products, it is a decomposition reaction. When the cation of a single element, replaces the cation in a compound, it is a single replacement. When the cations of two different reactants exchange and end combined with the anions of the others compounds, it is a double replacement reaction.
Answer:
B
Explanation:
when two plates come together and one goes underneath, it forms a ridge.
Answer:
23.61m/s
Explanation:
Km/hr is a unit of expressing the speed of a body. Speed is the rate of change of distance with time. Also, the same unit is applicable for expressing the velocity of a body. But to find the velocity, we must emphasize the direction of motion of the body.
Given parameter:
85km/hr to cm/s
Note:
1000m =1km
3600s = 1hr
So;
85 x
Cancelling out km and hr;
= 85 x 0.278m/s
= 23.61m/s
Answer: Concentration of NaOH calculated will be underestimated.
Explanation:
End point is an observational point , which tells us about the completion of reaction between the titrant (solution in burette) and titre(solution in conical flask) in titration experiment.
In this case , NaOH is titrant whose concentration is unknown.
, 
, 
....(1)
According to question a chemist overshoots the end point and adds to much of NaOH solution, which means increase in the value of 
.
Then the value of 
in equation (1), will get lowered , which means that the concentration of NaOH was lower than that of the actual value. Hence underestimated concentration of NaOH.
Answer:
The final balanced equation is : 2C2H2+5O2→4CO2+2H2O.
