b. It is a reaction that requires heat to proceed.
c. It is a reaction that draws heat from its surroundings.
d. It is a reaction that releases heat to its surroundings.
B. metalloids
C. non-metals
The correct answer is C. Non-metals
Explanation:
Krypton is one of the 118 chemical elements that have been identified. Krypton's main characteristics include lack of odor, color, and low reactivity, due to this, this element is classified as a noble gas and in the periodic table is part of the Group 18. Moreover, Krypton is part of the non-metals category that includes elements with low density, melting/boiling point, and conductivity, which are all features exhibit by Krypton as this has low electricity and heat conductivity, low density, low melting point (around -157 °C) and low boiling point (-153 °C). Thus, the category Krypton gas and in general Krypton belongs to is non-metals.
An element is a pure substance made up of only one kind of atom, each of whose nuclei contains the same amount of protons. A substance whose atoms all contain the same number of protons is said to constitute an element; alternatively, all the atoms of a certain element must contain the same number of protons. Here 'Kr' is a non-metal. The correct option is C.
The elements that absorb or gain electrons to generate negative ions are known as non-metals. In their outermost shell, non-metals often have 4, 5, 6, or 7 electrons. High electronegativities are seen in non-metals. This indicates that non-metal atoms exhibit a significant propensity to attract more electrons than they would ordinarily have.
Krypton is a Group 18 rare gas and chemical element with the atomic number 36 and the symbol Kr.
Thus the correct option is C.
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solubility curve at
right. Which
material is a
gaseous solute?
Answer:
Substance A
Explanation:
See attached worksheet,
The solubility of gasses decreases as temperature rises.
The safest method for diluting concentrated sulfuric acid with water is to add acid to water. This way, when spill occurs, the acid is already diluted and less harmful than adding water to acid.