Which of the following materials is a metalloid or semi-metal (has some metallic properties and some properties similar to non-metals) ?

Group of answer choices

Na

silicon (Si)

NaCl

selenium (Se)

While performing an experiment on the enzyme amylase, Macy uses three different pH solutions: pH 3.0, pH 4.0, and pH 6.7. She finds that all the starch is broken down fastest at pH 6.7. How would you justify these findings? A.

To make salt water a heterogeneous mixture, you would have to

What happens during photosynthesis?

Why is milk considered a colloid?

Explain at the molecular level why the pH increases as NaOH is added to HNO3 (titration)

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda