Classify each substance below as an atomic element, a molecular element, a molecular compound or an ionic compound.

CO2-

Ag-

KCl-

F2-

I2-

HBr-

Cr-

Al2O3-

Which body system has a main focus on the heart, blood and veins? a. nervous b. circulatory c. urinary d. skeletal

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How many grams of KCl are produced when 60 grams of K are reacted?

Write a balanced chemical equation for the standard formation reaction of solid potassium dichromate k2cr2o7

Tom wanted to test his hypothesis that plants grow better at room temperature than in cold temperatures. He placed an ivy plant in the refrigerator, which had no light source. He also placed a spider plant in the window in his room.

4*C: 4cm 8*C: 10cm 12*C: 14cm 16*C: 18cm 20*C:24cm 24*C: 12cm what is the independent variable, dependent variable and three constant variables?

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change

Which electrons are lost by an atom of iron when it forms the Fe3 + ion? A. One s orbital electron and two d orbital electrons B. Two s orbital electrons and one d orbital electron C. Three s orbital electrons D. Three d orbital electrons

What does a three letter chemical symbol mean