I think the correct answer is he first option. Among the popular sayings given, the true scientific theory is the statement "Eating <span>lots of carrots will improve your eyesight.</span>" This is because many studies and researches had been done and proved that carrots really helps improve or maintain the health of the eyes.
There number of calories that are required to raise the temperature of 105 g of water from 30.0 c to 70.0 c is calculated as follows
Q(heat)= mass(m) x specific heat capacity of water ( 1 cal/g/c) x delta T ( change in temperature
delta T = 70.0- 30.0= 40.0 c
Q= 105 g x 1 cal/g/c x 40 c = 4200 calories is needed to raise temperature of water from 30 c to 70 c
The data we collect is called empirical evidence, which just refers to the information collected by experiments or other observations.
Answer: A) The reaction is spontaneous above 276 K.
Explanation:
According to Gibb's equation:
= Gibbs free energy
= enthalpy change = +29.3 kJ/mol =29300 J/mol
= entropy change = +106 J/molK
T = temperature in Kelvin
= +ve, reaction is non spontaneous
= -ve, reaction is spontaneous
= 0, reaction is in equilibrium
for reaction to be spontaneous
Thus the Reaction is spontaneous when temperature is above 276 K.
Answer:
1) The smallest scale increment is 0.1 cm.
2) The distance represented by the dotted line "a" is 5.25 cm and the uncertainty in this measurement is ± 0.05.
3) The distance represented by the dotted line "b" is 5.85 cm and the uncertainty in this measurement is ± 0.05.
Explanation:
1) The smallest scale increment is 0.1 cm.
- That the distance between any two numbers on the ruler (for example; 4&5) is 1.0 cm.
- There are 10 increments between the two numbers which means that the increment scale (the smallest scale increment) is 0.1 cm.
2) The distance represented by the dotted line "a" is 5.25 cm.
- The dotted line "a" lies between 5.2 and 5.3 and it is mainly in the middle between the two smallest increments ≅ 5.25.
- The uncertainty in this measurement is ± 0.05 as shown in the image attached in the question that the measurement may be off by as much as 0.05 cm above or below its true value.
2) The distance represented by the dotted line "b" is 5.85 cm.
- The dotted line "b" lies between 5.8 and 5.9 and it is mainly in the middle between the two smallest increments ≅ 5.85.
- The uncertainty in this measurement is ± 0.05 as shown in the image attached in the question that the measurement may be off by as much as 0.05 cm above or below its true value.