Answer:Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic. exothermicA description of a chemical reaction that releases heat energy to its surroundings.
Answer:
C. 2.70 g/mL
Explanation:
Density is the ratio between the mass of a substance and the volume it occupies. Based on Archimedes' volume, the displaced volume of the aluminium is the volume it occupies. To solve this question we must find the difference in volume between initial volume of water = 30mL and final volume of water + aluminium = 39.26mL. This difference is the volume of the aluminium. With its mass we can find density:
39.26mL - 30mL = 9.26mL
Density = 25.00g / 9.26mL =
2.70g/mL
Right answer is:
<h3>C. 2.70 g/mL
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Answer:
The innermost electron shell of an atom can hold up to _____ electrons. ... What determines the types of chemical reactions that an atom participates in? the number of electrons in the outermost electron shell. Atoms with the same number of protons but with different electrical charges
CaCl₂ is the chemical formula of calcium chloride, and its molar mass is 110.983 g/mol. It is an ionic compound comprising two chlorine anions and calcium cation. The bivalent calcium metal produces an ionic bond with two chlorine atoms. Calcium chloride is found in nature in its hydrated forms. It also occurs in huge concentrations in natural brine from salt deposits and salt lakes.
Calcium chloride is found as granules or flakes, as an odorless white powder. It exhibits a melting point of 782 degree Celsius, density of 2.15 g/ml, and a high boiling point of over 1600 degree Celsius.