Chemistryacademic

"What is the molecular shape of a water molecule, H2O? A. trigonal pyramidal B. tetrahedral C. linear D. bent E. none of the above"

"Is CO2​ ionic or covalent?"

"What is the electron geometry and molecular shape of carbon tetrabromide (CBr4) without making a model? Do you expect the bonds in this molecule to be polar?"

Why is the symbol of Chlorine Cl and not Ch?

Is BeCl2 polar or nonpolar in terms of its bonds and molecule?

"Enter the ionic formula for the compounds formed between the following pairs: Na+ and Se2− Rb+ and P3− Cs+ and I− "

Which species is the conjugate base of HPO^2−4?Write the formula and net charge.

"A) How many moles of C3H8 (molar mass 44.09 g/mol) are represented by 5.01 g of this compound? Give your answer correctly to three significant digits. B) How many C atoms are present in the sample of C3H8 with mass 5.01 g? Avogadro’s number is 6.022 × 1023. Enter your answer using scientific notation and to three significant digits."

"Which substance is the most alkaline? A. Blood B. Orange juice C. Ammonia D. Milk"

"Seafood or plant toxins would be which type of contamination? A. Physical contamination B. Biological contamination C. Chemical contamination D. All of the above"

"Write Lewis structures that obey the octet rule for each of the following. Except for HCN and H₂CO, the first atom listed is the central atom. For HCN and H₂CO, carbon is the central atom. (a) HCN (b) PH₃ (c) CHCl₃ (d) NH₄⁺ (e) H₂CO (f) SeF₂ (g) CO₂ (h) O₂ (i) HBr"

"How many valence electrons does an atom of the following elements have? Si (Silicon) K (Potassium) Ba (Barium) Ne (Neon) S (Sulfur)"

What is the molar mass of potassium hydroxide, KOH?

Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+ ,Al3+ ,I − ,O2−

How many valence electrons does gallium (Ga, atomic no. = 31) have?

The net charge on a sulfide ion (s2−) is obtained by gaining electrons. Explain how this ion obtains its charge. Your answer should include a discussion of subatomic particles.

"Identify the conjugate acid for each base. Conjugate acid of H2PO4−"

How many protons, neutrons, and electrons are in a helium atom?

Draw the Lewis structure for sulfur tetrafluoride, SF4.

Explain the Lewis dot structure for methanol.

The bonds in the compound MgSO₄ can be described as: ionic, only covalent, only both ionic and covalent neither ionic nor covalent

Which Lewis electron-dot diagram is correct for CO2? A. :O=C=O: B. :O-C=O: C. :O=C-O: D. :O=CO:

How many millimoles are in 1 mole?

What are some elements that have two-letter symbols that are the first letters of the word?

What is the molar mass of acetic anhydride? 182.217 g/mol 102.09 g/mol 151.163 g/mol 109.13 g/mol

Write a balanced chemical equation for the standard formation reaction of liquid acetic acid, CH3COOH.

What does 40 oz mean in mL?

The chemical formula for Carbon Tetrachloride is: A. CC1 B. CCl4 C. C4Cl D. CC104

Write the chemical formula for the chlorite ion.

How much is 300 mcg in mg?

Find a way for elements that have atomic numbers that add up to 200. The elements must include Kr, V, and VII.

A 14-oz bottle contains approximately how many milliliters (ml)?

Silicon (Si) is an element that helps computers run. How many valence electrons does silicon have? Write your answer as a number, not the word form of the number.

What is the molecular weight (molar mass) of Lead(III) Nitrate?

What is the name and molar mass of Fe2​O3?

How many valence electrons does an iron atom (Fe) have?

Draw the best Lewis structure for ICl5.

Draw the major product of this reaction. Ignore inorganic byproducts.

The element silver forms ions with a +1 charge. How many electrons do these ions contain?

What is the chemical formula for methane?