Quick Opening 1

What is the name for group 1, and what type of ions will they form?

• They are called alkali metals, and they will each lose an electron to have a charge of +1 when they form ions.
• They are called alkali metals and they will each gain an electron to have a charge of +1 when they form ions
• They are called alkaline earth metals, and they will each lose an electron to have a charge of+1 when they form ions.
• They are called alkaline earth metals, and they will each gain an electron to have a charge of−1 when they form ions.

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How does the combination of deuterium ( H-2) and tritium ( H-3) during fusion change the nuclei?

• Two lighter nuclei form a lighter nucleus and release energy.
• Two lighter nuclei form a nucleus with fewer protons and release energy
• Two lighter nuclei form a heavier nucleus and release energy.
• Two lighter nuclei form a nucleus with fewer electrons and release energy.

According to information in the periodic table, what mistake did Luis make in his table?

• The −2 charge for Se is incorrect, because Se is in group 17 which have charges of −1 when they form ions
• The +2 charge for K is incorrect, because K is in group 1 which have charges of +1 when they form ions.
• The +2 charge for Cr is incorrect, because Cr is in group 1 which have charges of +1 when they form ions.
• The −1 charge for Br is incorrect, because Br is in group 1 which have charges of −2 when they form ions.

What types of bonds formed in each of these compounds, and how does the melting point data support this conclusion?

• CH₄ and H₂O must have ionic bonds because they have high melting points, whereas MgCl₂ and NaBr must have covalent bonds because they have low melting points.
• CH₄ and H₂O must have ionic bonds because they have low melting points, whereas MgCl₂ and NaBr must have covalent bonds because they have high melting points.
• CH₄ and H₂O must have covalent bonds because they have low melting points, whereas MgCl₂and NaBr must have ionic bonds because they have high melting points
• CH₄ and H₂O must have covalent bonds because they have high melting points, whereas MgCl₂ and NaBr must have ionic bonds because they have low melting points.

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Tyrone is making a circuit at home. The picture shows all the supplies he uses to create his circuit.He knows if he puts the electrodes into the deionized water, it will not conduct electricity and his circuit will not work. Which compound should Tyrone mix into with the water so that his circuit will work?

• NaCl because it is an ionic compound which will dissociate in water and make the waterconduct electricity
• NaCl because it is a covalent compound which will dissociate in water and make the waterconduct electricity
• C₆H₁₂O₆ because it is an ionic compound which will dissociate in water and make the waterconduct electricity
• C₆H₁₂O₆ because it is a covalent compound which will dissociate in water and make the waterconduct electricity

What is the chemical formula for nitrogen dioxide?

• NO₂
• NO₄
• N₂O
• N₄O

Janelle made a mistake in her notebook. Which statement best describes the mistake she made?

• Oxygen is classified as a metal rather than a nonmetal.
• Oxygen has seven valence electrons rather than six.
• An oxygen ion is called a cation because it loses electrons.
• An oxygen ion gains two electrons when it becomes an anion.