1) color change - for example, when bleach is shot down by mistake, in colored clothing;
2) gas release - for example, when playing an effervescent tablet in water.
3) heat release - for example in combustion;
hope this helps!.
Answer:
have stars that might appear to wobble
often have one star that is brighter than the other
Explanation:
A binary star system is a star system made up of mostly two stars that moves round their common fixed center.
The two orbiting stars are gravitationally bonded to one another and they move round each other.
Most binary stars might appear wobble. One of the stars often appears brighter than the other.
The complete balanced chemical reaction for this would be:
<span>NaOH + C3H6O3
--> NaC3H5O3 + H2O</span>
So we see that exactly 1 mole of NaOH reacts with 1 mole
of lactic acid.
Calculate moles of NaOH.
moles NaOH = 0.07 moles/L * 0.0268 L
moles NaOH = 1.876 x 10^-3 mol
So,
moles C3H6O3 = 1.876 x 10^-3 mol
The molar mass of lactic acid is 90.08 g/mol so the mass
is:
mass C3H6O3 = (1.876 x 10^-3 mol) * 90.08 g/mol
<span>mass C3H6O3 = 0.169 g</span>
Formula to find the percent composition of an element in a compound is
.
Now enter the variables into the formula.
%
Round to 3 significant figures. 15.897% = 15.9%
The answer is 15.9% H