It is advisable to wear long sleeve when when a student is working in a chemistry lab so that to protect arms from lab chemicals. when someone enter the chemistry lab to wort or to study should be well prepared with appropriate gears and security measure to avoid injury.
The symbol for the hydronium ion is H3O+.
An hydronium ion is usually formed when an acid is present in water. The hydronium ion is made up of three atoms of hydrogen and one atom of oxygen, thus an hydronium ion is a water molecule which has gained an extra positive hydrogen ion.
Answer:
Biotic factor
Explanation:
Competition only exist due to limited resources (abiotic factors AKA environment) which occurs in biotic factors (living organisms).
Fear factor is nonsense because fear does not exist in plants but they still compete for sunlight and water.
Factory factor is nonsense as well because this term does not exist in biology.
<h3><u>Answer;</u></h3>
Reduces the amount of work needed to move an object.
<h3><u>Explanation;</u></h3>
- <u>A simple machine is any device that reduces human effort to do work. They include, levers, inclined plane, pulleys, etc</u>.
- Simple machines make work easier by multiplying, reducing, or changing the direction of a force and also by changing the distance the force acts through.
- Simple machines cannot change the amount of work done, however, they can reduce the effort force that is required to do the work. This is to mean, machines can neither increase or reduce the energy involved in doing work.
Answer: The empirical formula is ![C_7H_{12}O_2](https://tex.z-dn.net/?f=C_7H_%7B12%7DO_2)
Explanation:
If percentage are given then we are taking total mass is 100 grams.
So, the mass of each element is equal to the percentage given.
Mass of C= 65.60 g
Mas of H = 9.44
Mass of O = (100-(65.6+9.44)= 24.96 g
Step 1 : convert given masses into moles.
Mass of C =
Moles of H =
Moles of O=
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C =
For H =
For O =
The ratio of C:H:O= 3.5: 6: 1
Converting them into whole numbers, the ratio will be 7: 12: 2
Hence the empirical formula is ![C_7H_{12}O_2](https://tex.z-dn.net/?f=C_7H_%7B12%7DO_2)