Answer: average speed
Explanation: describes speed of motion when speed is changing.
The third one Ta. is the answer
The atomic number of a neutral atom is equal to the number of protons and the number of electrons of the atom. The atomic weight meanwhile is equal to the sum of the number of protons and number of neutrons. In this case, the atomic number of the atom is 3 and the atomic mass is 7. Hence the element is Lithium, a metal
Answer:
25 mL of the 10% solution.
Explanation:
<em>Clayton will mix x milliliters of a 10%, percent by mass saline solution with y milliliters of a 20%, percent by mass saline solution in order to create an 18%, percent by mass saline solution.</em> This can be described with the following equation:
0.1 x + 0.2 y = 0.18 (x + y) [1]
<em>If Clayton uses 100 milliliters of the 20%, percent by mass saline solution, how many milliliters of the 10%, percent by mass saline solution must he use?</em>
If y = 100 mL, what should be the value of x?
Let's solve [1] for "x" and replace with the value of "y".
0.1 x + 0.2 y = 0.18 (x + y)
0.1 x + 0.2 y = 0.18 x + 0.18 y
0.02 y = 0.08 x
x = 0.25 y = 0.25 × 100 mL = 25 mL
