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Questions in chemistry

[Terjawab] A molecule has two atoms that are bonded to the central atom and one lone pair of electrons around this central atom. What is the shape of the molecule? A. Bent B. Linear C. Trigonal planar D. Trigonal pyramidal

[Terjawab] A solid compound in a sealed container was kept at a very low temperature in a freezer. When placed at room temperature, the substance quickly turned into a liquid. This compound is most likely which of the following? A. an ionic compound because it has a low boiling point B. a covalent compound because it has a low boiling point C. an ionic compound because it has a low melting point D. a covalent compound because it has a low melting point

[Terjawab] What is the mass of 0.01 mol of [tex]Na_2SO_4[/tex]?

[Terjawab] What is the mass of 2 moles of KBr and the mass of 0.1 moles of [tex]C_6H_{12}O_6[/tex]?

[Terjawab] Inside a volcano, how do the slanted layers of hardened lava form?

[Terjawab] What is a radical? A. A group of atoms that act like one atom. B. A group of ions that have no charge. C. A group of ions that break up during a reaction. D. A group of atoms that give off radiation.

[Terjawab] Select all of the answers that apply. Which of the following are ways the atmosphere supports life? A. Contains trace gases B. Blocks harmful UV rays C. Transports and distributes heat D. Cycles essential elements: C, O, and N

[Terjawab] Why is absolute dating more accurate than relative dating? Select one: A. Relative dating uses the half-life of an element. B. Absolute dating uses the half-life of an element. C. Relative dating compares the placement of fossils. D. Absolute dating uses more fossils than relative dating.

[Terjawab] What is the chemical formula of CClâ‚„? Please explain.

[Terjawab] Uranium-238 has a half-life of 4.5 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth? A. 10 percent B. 25 percent C. 50 percent D. 75 percent