Questionmark Perception

	Chemistry

	1 of 7 What is the total number of electrons in an atom of an element with an atomic number of 18 and a mass number of 40? 18 58 40 22
	2 of 7 Which phase change is endothermic? gas ->liquid liquid ->gas liquid ->solid gas ->solid
	3 of 7 The properties of silicon are characteristic of both a metal and a nonmetal a metal, only neither a metal nor a nonmetal a nonmetal, only
	4 of 7 Which reactant is most likely to have d electrons involved in a chemical reaction? an alkali metal a halogen a transition element a noble gas
	5 of 7 The picture below shows a gas at standard conditions in a container with a moveable piston. According to Charles’s law, what will happen to the piston when the gas is heated? The piston will move down because the gas particles move slower and get closer together. There will be no change because heat will not affect the system. The piston will move up because the gas particles move faster and get farther apart. The piston will move up because the gas particles get larger.
	6 of 7 Which of the following elements has the highest electronegativity? B (boron) C (carbon) O (oxygen) N (nitrogen)
	7 of 7 The positions of copper (Cu) and carbon (C) are identified on the periodic table below. When carbon-14 decays, it emits a beta particle to produce nitrogen-14, as shown below. When copper-67 undergoes beta decay, which of the following isotopes is produced? copper-66 copper-68 nickel-67 nickel-67

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