Answer: True
Explanation:
Color change is evidence that a chemical change may have occurred. Fizzing or foaming is evidence that a chemical change may have occurred. ... Production of heat or light is evidence that a chemical change may have occurred.
I believe that east Texas is shaded green because it either has a grassy plain or there are a lot of grassy hills and I think that west Texas is shaded brown because it is like a desert.
Answer:
13) 3.9
14) 12000
15) 6800
16) 110
17) 0.00049
18) 120
Explanation:
First we will look at the second digit of given values.
we will draw a line after second digit then we will look the digit after line.
It the digit after line which is 3rd digit is 5 or more than 5 then one will be added to the second digit.
It it is less than five then second digit remain same.
After this we will add zeros to the right till decimal point.
13) 3.948
Round to two significant figures = 3.9
14) 11561.06
Round to two significant figures = 12000
15) 6789.2
Round to two significant figures = 6800
16) 112.6
Round to two significant figures = 110
17) 0.00048888
Round to two significant figures = 0.00049
18) 119.999
Round to two significant figures = 120
Answer:
V KOH = 247.939 mL
Explanation:
at the point of equilibrium:
mol CH3COOH = mol KOH.......for weak acid system - strong bases...(1)
⇒ mol CH3COOH = 0.775L * 0.819 mol / L
⇒ mol CH3COOH = 0.634 mol CH3COOH.....(2)
replacing (2) in (1):
0.634 mol = V KOH * 2.56 mol / L
⇒ V KOH = 0.634 mol / (2.56 mol / L )
⇒ V KOH = 0.247939 L ( 247.939 mL )