Chemistryacademic

Write the complete ground-state electron configuration of Ag.

Why must lead have a +2 charge? A. The anion and the cation always have the same charge. B. The number of anions and cations must be the same. C. So the net charge equals zero.

Determine whether each described process is endothermic or exothermic. a. Ice melts into liquid water b. A process with a calculated positive q. c. Wood burns in a fireplace. d. A process with a calculated negative q. e. Acid and base are mixed, making the test tube feel hot. f. Solid dissolves into solution, making the ice pack feel cold.

Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. If it is doubly ionized, what is the charge of the gold ion and how many electrons remain in the ion?

Is sour taste a physical or chemical property?

In the modern periodic table, find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?​ | 1 | 2 | | | | | | | | | | | | | | | 13 | 14 | 15 | 16 | 17 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 2 | | | | | | | | | | | | | | | | | | 5 | 6 | 7 | | 3 | Be | | | | | | | | | | | | | | | | | B | C | N | | 4 | 12 | | | | | | | | | | | | | | | | | 13 | 14 | 15 | | 5 | Mg | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | | | | | | | Al | Si | P | | 6 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | | | | | | | 31 | 32 | 33 | | 7 | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn | | | | | | | Ga | Ge | As | | 8 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | | | | | | | 49 | 50 | 51 | | 9 | Sr | Y | Zr | Nb | Mo | Tc | Ru | Rh | Pd | Ag | Cd | | | | | | | In | Sn | Sb | | 10 | 56 | 57 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | | | | | | | 81 | 82 | 83 | | 11 | Ba | La | Hf | Ta | W | Re | Os | Ir | Pt | Au | Hg | | | | | | | Tl | Pb | Bi | | 12 | 88 | 89 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | | | | | | | | 116 | | | 13 | Ra | Ac | Rf | Ha | Sg | Ns | Hs | Mt | 110 | 111 | 112 | | | | | | | | 116 | | Lanthanides Actinides f | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | Ce | Pr | Nd | Pm | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb | | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | | Th | Pa | U | Np | Pu | Am | Cm | Bk | Cf | Es | Fm | Md | No |

How many resonance structures can be drawn for ozone, O3?

Is ammonia an element or compound?

Fluoromethane has the chemical formula CH3F. What molecular structure will fluoromethane have? A. Tetrahedral B. Trigonal bipyramid C. Linear D. Square planar

The iodide ion I− carries what type of charge?

What is the molar mass of potassium nitrate, KNO₃?

All chemicals in the lab are to be considered dangerous. True or False

What is the most common ion charge for sodium? A. +1 B. +2 C. -1 D. -2

How many valence electrons are in the oxygen peroxide ion O^2−(2)?

Of the two compounds, SiF4 ​ and SF4, which is polar and which is nonpolar?

How to find the molarity of acetic acid in a vinegar lab report? A. Measure the mass of the acetic acid. B. Calculate the volume of acetic acid. C. Divide the moles of acetic acid by the volume of the solution. D. Determine the density of acetic acid.

Is BrF₃ nonpolar or polar?

Does nitrogen gain (negative charge) or lose (positive charge) electrons? A. Lose B. Gain

Does strontium form a cation or anion, and what charge does it have?

What is the molar mass of beryllium?

What is the total number of valence electrons in the phosphate ion?

What is the charge on the strontium ion?

The chemical symbol of iron is "Fe" and not "Ir," as one might expect. Why is this the case? Provide examples of two other elements whose chemical symbols differ from the shortened form of their names.

How many protons are in the nucleus of an aluminum atom?

Which statement best describes ionic bonding? A. A metal atom transfers electrons to a nonmetal atom. B. Many atoms give up electrons that can move among them. C. Two nonmetal atoms share electrons between them. D. Two metal atoms share electrons between them.

Ethyl acetate has a density of 0.902 g/mL. Which layer will be on top if you are using ethyl acetate and water in your liquid-liquid extraction?

Draw the Lewis structure for xenon tetrafluoride (XeF₄). How many valence electrons surround the central Xe atom in this structure?

What is the charge on a hydroxide ion? A. 1+ B. 2+ C. 2- D. 1- E. 0

Calculate the mass, in grams, of Al(OH)3 required for this reaction: Reactants: Al(OH)3 Products: Al2O3 + H2O Given masses: Al2O3 = 21.8 grams H2O = 9.7 grams Enter only a number for your answer.

Why is NH3 classified as a polar molecule?

In the Lewis electron dot structure for O2, how many additional dots (electrons) should be shown around each O atom?

Is the bond type of PCl₃ polar or nonpolar? And is its molecular polarity polar or nonpolar?

What is the molar mass of P2O5?

How many equivalent resonance structures can be drawn for the molecule of SO3 without violating the octet rule on the sulfur atom?

Is fluorine a metal or a nonmetal? How many valence electrons does a fluorine atom have?

The mass of an atom of element x is equivalent to the total mass of 7 hydrogen atoms.

Mercury has a density of 13.6 g/mL. What is the mass in pounds of 556 mL of mercury?

What is the formula for copper(I) carbonate?

How many electrons does neon have in its outer shell?

Bromine has two isotopes, with mass numbers 79 and 81. Its relative atomic mass is often given as 80. What does that tell you about the relative abundance of the two isotopes?