Choose the correct direct object pronoun for each sentence. Marcos busca la llave

Which of these substances are compounds? I. Neon II. Crude oil III. Water IV. Sodium chloride

Fill in the blanks with the present progressive of the verbs in parentheses. (Remember to use Estar + the Verb) La esposa del profesor _________________(hacer) las maletas.

Which of these is the correct normal decimal notation for 5.23 × 10−4?

Fill in the blank with the correct form of estar: Nosotros _______  muy ocupados todos los lunes.

Fill in the blanks with the indicated demonstrative adjective or pronoun. Voy a comprar _________ pantalones verdes. (these)

Choose the correct direct object pronoun for each sentence. Voy a ver el partido de baloncesto.

The elements Li, Na, K, Rb, and Cs are the members of which group/family?

Which of these particles has a negative charge?

Metals tend to form ions with a positive charge. The most likely way to form a positively charged ion from an atom is by doing which of the following?