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 concentration gradient must exist.
Explanation:
Environmental law is the correct answer.
Glad i could help(:
Phototropism is the response towards or away from a light source.
Answer: The question is incomplete.
The options are not given but the correct answer is;
They can protect the body from infection.
Explanation:
Microorganisms are microscopic organisms that are found in every environment. They include bacteria, fungi, viruses e.t.c.
The can be single celled or form colony.
Microbes are of utmost important in larger animals in that they form symbiotic relationship with them. Microbes live in or on organisms.
Microbes help in digestion of food in intestinal gut and also help prevent infections due to their activities in or on the larger animals. Their secretions help to prevent Invaders. They benefit by having shelter and nutrients they feed on from their host.