Which is evidence that a chemical reaction has occurred? A) a phase change occurs B) a new gas is observed in the form of bubbles C) red and yellow paint mixing to make orange paint D) the temperature of the substance remains constant

Exit Calcium has an atomic number of 20. How many electrons of a calcium atom are involved in chemical bonding? A. 2 B. 8 C. 16 D. 20

According to the below equation, how many moles of SO2 are required to generate 1.43*1024 water molecules? 2H2S+SO2→3S+2H2O

Graph of the relationship between mass and thermal energy

Which liquid would be the most difficult to raise or lower the temperature of A. one with a low density B. one with a high capacity C. one with a high density D. one with a low heat capacity

Which soil cannot be rolled into balls or clumps

Determine whether the following pairs of elements can form ionic compounds. (Ionic or Not Ionic) 1 - iron and cholrine 2 - oxygen and magnesium 3 - fluorine and sodium 4 - potassium and sulfur 5 - nitrogen and iodine 6 - lithium and calcuim

What is the scientific notation of 18? Must be a number 1<_ M <10

Why do you think there is not a periodic table of compounds? Explain with evidence.

Carbon forms a great variety of stable compounds. Which of the following is not a reason for this variety? A. Carbon can form up to four covalent bonds with other atoms. B. Carbon atoms can bond to other carbon atoms. C.

Which climate conditions are typical of regions near the North Pole and the South Pole