Answer: According to the first law of thermodynamics, energy can be transferred from place to place or changed between different forms, but it cannot be created or destroyed. For instance, light bulbs transform electrical energy into light energy, and gas stoves transform chemical energy from natural gas into heat energy.
Explanation:
Answer:
The correct answer is 0.26 M
Explanation:
The initial concentration of NaCl solution (Ci) is 5.0 M. The initial volume of the solution (Vi) is 13 mL. The final volume is the addition of 240 mL to 13 mL (Vf= 13 mL + 240 mL= 253 mL).
In order to calculate the final concentration of the solution (Cf) we can use the following expression:
Ci x Vi= Cf x Vf
This mathematical expression is often used to calculate concentrations in dilution procedures. So, we introduce Ci, Vi an Vf in the expression and we calculate Cf:
Cf= (Ci x Vi)/Vf= (5.0 M x 13 mL)/253 mL= 0.257 M ≅ 0.26 M
Answer:
A,B,E
Explanation: I honestly think its easy, but it is dirty, so its not d,c it dirty.
Answer:D
Explanation:
It was Erdwin Chargaff an Austrian biochemist that proposed the base pairing rule. He studied the ratio of purine to pyrimidine nucleotides in different cells and species and concluded that the ratio of purine to pyrimidine is 1:1 from any cell of an organism.
Chargaff rule state that the number of purines is equal to the number of pyrimidines in individuals of the same specie.
Chargaff's base pairing rule Adenine equals thymine and guanine equals cytosine. Always the DNA two strands are complementary to each other. So the adenine of one strand will pair the thymine of the opposite strand, while the quanine will pair with cytosine
Ocean waters are constantly on the move. <span>Ocean currents </span><span>flow in complex patterns affected by wind, water salinity, temperature, topography of the ocean floor, and the earth's rotation. Most ocean currents are driven by wind and solar heating of surface waters near the equator, while some currents result from density and salinity variations of the water column. Ocean currents are relatively constant and flow in one direction, in contrast to </span>tidal currents<span> along the shore. </span>