8. Read the text and answer the questions: oxides, one of them very poisonous. The other is readily soluble in water and forms a weak
The chemical element X forms several simple substances (allotropic forms). It has 2
oxoacid.
1) which is the element X?
2)Write the names of its allotropic forms.
3)Write the formulas of the oxides and determine the oxidation state of the element X in
each of these two oxides.
4)Represent by an equation the formation of the oxoacid.
5)Calculate how many grams are 2 mol of the element X.

After cloud droplets form, what must happen to them for precipitation to occur?

1. an experiment in your science class lists the materials needed for the lab. it is your job, as a lab partner, to measure out 25 ml of distilled water and 2.5 grams of magnesium. what lab measuring tools would you choose to measure each substance and how would you use each tool to get the correct amounts? be sure to describe the process you would follow step-by-step. (5 points) 2.which of the following is an si base unit for measuring mass? (2 points) ampere gram meter pound 3.which of the following is an si base unit for time? (2 points) decades hours minutes seconds 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer 4.which of the following tools should a scientist use to measure an object in milligrams? (2 points) graduated cylinder pan balance tape measure thermometer. 5.a pencil beside a metric ruler. the ruler is scaled from 1 centimeter to 10 centimeters, with markings for millimeters between each number. one end of the pencil is beside the 0 on the ruler, and the pencil point is beside the 5. which of the following measurements is accurate but not precise? (2 points) 5 mm 5 cm 50 mm 50 cm 6. which of the following prefixes represents the largest value? (2 points) giga hector kilo milli 7. which of the following types of graphs is best for plotting the percentages of a whole value in a data set? (2 points) bar graph circle graph histogram line graph

Which three statements represent the benefits of performing experiments using computer simulations?