4) Which differentiates a compound from a mixture of two or more elements? - A) The elements in a compound may be present in varying proportions - B) A compound does not exhibit the individual properties of the elements of which it is composed - C) A compound is made up of only one element - D) A compound cannot be made up of more than two elements B) A compound does not exhibit the individual properties of the elements of which it is composed A) The elements in a compound may be present in varying proportions C) A compound is made up of only one element D) A compound cannot be made up of more than two elements

¿Cuáles son los conceptos básicos de la química? SELECCIONE TODAS LAS QUE CORRESPONDAN a Productos químicos b Reacciones químicas do Átomos y moléculas d Energía

Refrigerants absorb heat: Select one: A. By evaporating from a liquid to a vapor. B. By converting heat energy into additional refrigerant molecules. C. By rearranging their molecular structure to form a new compound. D. By condensing from a vapor to a liquid.

(b) (15 points) If 32.05 ml of the NaOH standard are found to neutralize 25.00 ml of an unknown acid solution, determine the molarity of the unknown.

Try these: $\square Ca+\square O_{2}\rightarrow \square CaO$

How many valence electrons does Helium Have? 2 Valence electron 3 Valence electron 5 Valence electron 4 Valence electron 1 Valence electron

The relationship between the number of electrons in an atom's outer shell and the atom's tendency to bond is called the octet rule. What can you infer about the meaning of "octet?" It refers to negative charges. It refers to sets of eight valence electrons It refers to explosive substances. It refers to different states of matter.

Which of the following was the first foam that was introduced into a hose stream, creating a reaction and ultimately a finished foam? Water-based foam Chemical foam Alcohol-resistant foam Mechanical foam

Which of the species below is less basic than acetylide? $CH_{3}MgBr$ $CH_{3}ONa$ $CH_{3}Li$ both A and C all of the above

Choose the conjugate acid for the following base: $N_{2}O_{2}^{2-}$ a. $NO_{2}^{-}$ $HN_{2}O_{2}^{-}$ $H_{2}N_{2}O_{2}$ $HNO_{2}$ $HPO_{4}^{2-}$ b. $H_{2}PO_{4}^{-}$ $H_{2}PO_{4}^{2-}$ $H_{3}PO_{4}$ $H_{3}PO_{4}^{-}$ $B_{4}O_{7}^{2-}$ C. $HB_{4}O_{7}^{2-}$ $HBO_{2}$ $HB_{4}O_{7}^{-}$ $H_{2}B_{4}O_{7}$

The difference between Q and $K_{sp}$ is no differencé. $K_{sp}$ is the value of the product at equilibrium and Q is the value of the product under any condition. Q is the value of the product at equilibrium and $K_{sp}$ is the value of the product under any condition. Q is greater than $K_{sp}$ $K_{sp}$ is greater than Q.