Which statement best describes an igneous intrusion? A. Magma explodes to the surface and forms a smooth outer layer of rock.B. Magma is exported to an open area and forms iron.C. Igneous intrusions form when ice crystals splash into lava.D. Magma is injected into surrounding rock forming an igneous intrusion.
The molar mass of an element is equal to (A) the mass of an atom of the element in grams. (B) the atomic mass of the element in grams. (C) the number of atoms in a mole of the element. (D) the number of atoms in a gram of the element. (E) the number of electrons in an atom in grams.
Ka, the acid dissociation constant, for an acid is 9 × 10^{−4} at room temperature. At this temperature, what is the approximate percent dissociation of the acid in a 1.0 M solution? (A) 0.03% (B) 0.09% (C) 3% (D) 5% (E) 9% Can you please explain with some details?
Which instrument is directly used to determine the relative masses of atoms? (A) spectroscope (B)Geiger counter (C)mass spectrograph (D)microbalance (E)electron microscope
Which is a proper description of chemical equilibrium? (A)The frequencies of reactant and of product collisions are identical. (B)The concentrations of products and reactants are identical. (C)The velocities of product and reactant molecules are identical. (D)Reactant molecules are forming products as fast as product molecules are reacting to form reactants. (E)The numbers of moles of reactants and products are equal.
Solid sulfur dioxide, SO₂(s) Choose from the following (A) an ionic solid (B) a metallic solid (C) a molecular solid containing nonpolar molecules (D) a covalent network solid (E) a molecular solid containing polar molecules
chlorine a. purple solution b. brown-orange liquid c. green gas d. silver-gray liquid e. yellow-orange when burned in a flame
