Answer:
<em>I disagree with the student's claim</em>
<em></em>
Explanation:
<em>From basic chemistry, the rate of chemical reaction increases with an increased surface area.</em>
<em>This simply means that a powdered substance will react faster than a small pellet of the same substance.</em>
Let us break this down further. The pellet has a smaller exposed surface per grain to the solvent, here is how. Imagine the powdered substance bunched up together to make the small pellet, grains at the center of the pellet is blocked by other grains around it, and will take time before it comes in contact with the solvent. For the powdered grains, each grain has a surface independently exposed to the solvent and can easily come in contact with the solvent, taking less time to react with the solvent.
Technically, a powdered substance has more exposed surface area and logically will take a shorter time for the reaction to be complete.
Answer:
The given statements are not effective hypotheses
Explanation:
Given that,
Your little sister asks you a scientific question:
"Does chocolate milk come from brown cows?"
We know that,
The chocolate milk does not come from brown cows.
We need to find the given statement is effective hypotheses
According to given statement,
The following statements are not effective hypotheses because all cows give the white milk.
So, we can say that, we mix the chocolate powder in the milk then we get the chocolate milk.
Hence, The given statements are not effective hypotheses
Answer:
1 L
Explanation:
ppm means parts per million. Generally the relationship between mass and litre is given as;
1 ppm = 1 mg/L
This means that 1 ppm is equivalent to 1 mg of a substance dissolved in 1 L of water.
Answer:
Lead (IV) Chromate: Pb(CrO4)2
Explanation:
