Answer:
More than 40 percent measured above 5 ppb of lead, which the researchers considered an indication of a “very serious” problem.
Answer:
Zinc is an <em>element</em>.
Explanation:
Compounds are composed of two or more elements
the block will move to F but at the same time make it's way over to G because 250g weighs more than 100g
Answer:
It's D. On the surface of the solid.
Explanation:
If the reactant is a solid, the surface area of the solid will impact how fast the reaction goes. This is because the two types of molecule can only bump into each other at the liquid solid interface, i.e. on the surface of the solid. So the larger the surface area of the solid, the faster the reaction will be.
To do what...............
