Questions in Chemistry


which resources are significantly polluted by heavy metals like mercury

Questioned by administrator @ in Chemistry viewed by 140 persons

Which resources are significantly polluted by heavy metals like mercury? a. soil b. water c. neither A nor B d. both A and B
View 1 answer

what is the product of the hydrogenation of an alkene

Questioned by administrator @ in Chemistry viewed by 127 persons

Draw the product of the hydrogenation of 2-butyne. draw all hydrogen atoms.
View 1 answer

how many moles are there in 24 grams of fef3

Questioned by administrator @ in Chemistry viewed by 93 persons

How many moles are there in 24.0 grams of FeF3?
View 1 answer

select the atomic models that belong to the same element.

Questioned by administrator @ in Chemistry viewed by 77 persons

Select the atomic models that belong to the same element.
View 1 answer

what is the percent by mass of oxygen in fe2o3

Questioned by administrator @ in Chemistry viewed by 89 persons

What is the percent by mass of oxygen in Fe2O3 (formula mass = 160)?
View 1 answer

draw a second resonance form for the structure shown below.

Questioned by administrator @ in Chemistry viewed by 83 persons

Draw a second resonance structure for the following ion (be sure to include the charges and all lone pairs)... + ..N=N=N <-------------->.. ..
View 1 answer

what is the molar solubility of pbbr2 in pure water

Questioned by administrator @ in Chemistry viewed by 81 persons

The ksp of pbbr2 is 6.60×10−6 . What is the molar solubility of pbbr2 in pure water?
View 1 answer

predict whether the compounds are soluble or insoluble in water.

Questioned by administrator @ in Chemistry viewed by 82 persons

Predict whether the compounds are soluble or insoluble in water. Soluble Insoluble
View 1 answer

which pure substance is composed of more than one element

Questioned by administrator @ in Chemistry viewed by 94 persons

1) Which pure substance is composed of more than one element? A. carbonB. goldC. waterD. sodium​
View 1 answer

how many moles of no2 are present in 114.95 g

Questioned by administrator @ in Chemistry viewed by 86 persons

The molar mass of NO2 is 46.01 g/mol. How many moles of NO2 are present in 114.95g?
View 1 answer

what makes balancing redox reactions different from balancing other reactions

Questioned by administrator @ in Chemistry viewed by 73 persons

What makes balancing redox reactions different from balancing other reactions?
View 1 answer

which energy transformation takes place when using a power drill

Questioned by administrator @ in Chemistry viewed by 92 persons

4. Which energy transformation takes place when using a power drill? A. mechanical to chemical В. electrical to mechanical с. chemical to electrical D heat to mechanical
View 1 answer

if fluorine 20 undergoes beta decay what will it become

Questioned by administrator @ in Chemistry viewed by 88 persons

If fluorine 20 undergoes beta decay , what will it become ?
View 1 answer

if the nucleus was the size of a tennis ball

Questioned by administrator @ in Chemistry viewed by 99 persons

If the nucleus was the size of a tennis ball the atom would be the size of....?
View 1 answer

draw the missing curved arrow notation for the mechanism below.

Questioned by administrator @ in Chemistry viewed by 86 persons

Draw a mechanism for the reaction of the aldehyde with hydronium ion. In the first box, draw any necessary curved arrows. Show the products of the reaction in the second …
View 1 answer

what structures allow t cells to locate and destroy invaders

Questioned by administrator @ in Chemistry viewed by 88 persons

What structures allow T cells to locate and destroy invaders? O A. Macrophages O B. Pathogens O C. Lymph O D. Antibodies
View 1 answer

the amount of substance in a certain volume is its

Questioned by administrator @ in Chemistry viewed by 75 persons

The amount of one substance in a certain volume of another substance is called its ____________________.
View 1 answer

which of the following are correct for zero order reactions

Questioned by administrator @ in Chemistry viewed by 92 persons

Which of the following are correct for zero-order reactions? A. A higher concentration of reactants will not increase the reaction rate. B. The units for the rate constant and the …
View 1 answer

which of the following elements has the greatest metallic character

Questioned by administrator @ in Chemistry viewed by 85 persons

Which of the following Group 15 elements has the greatest metallic character? (1) nitrogen (3) antimony (2) phosphorus (4) bismuth
View 1 answer

dimensional analysis and the crash of flight 143 answer key

Questioned by administrator @ in Chemistry viewed by 147 persons

Explain how using dimensional analysis could have prevented this crash
View 1 answer

Most viewed questions in Chemistry


the health codes cover all issues except food handlers

Questioned by maham237 @ in Chemistry viewed by 2279 persons


heat transfer lab answers.

Questioned by maham237 @ in Chemistry viewed by 1803 persons


baking bread endothermic or exothermic

Questioned by maham237 @ in Chemistry viewed by 1102 persons



how many chlorine molecules are in 6.5 moles of chlorine

Questioned by administrator @ in Chemistry viewed by 1016 persons


if you are given the assignment to cut raw poultry

Questioned by maham237 @ in Chemistry viewed by 986 persons


marshmallow energy content

Questioned by maham237 @ in Chemistry viewed by 742 persons



chromium metal is immersed in an aqueous solution of cobalt(ii) chloride.

Questioned by maham237 @ in Chemistry viewed by 681 persons


a raindrop has a mass of 50.mg and the pacific ocean has a mass of ×7.081020kg .

Questioned by maham237 @ in Chemistry viewed by 681 persons



the reaction between aluminium powder and anhydrous barium nitrate

Questioned by maham237 @ in Chemistry viewed by 618 persons


which 1 mole sample has the least entropy

Questioned by maham237 @ in Chemistry viewed by 541 persons


lewis acids and bases are most closely associated with which process?

Questioned by maham237 @ in Chemistry viewed by 503 persons



which pair of elements is most apt to form a molecular compound with each other?

Questioned by maham237 @ in Chemistry viewed by 479 persons


(nh4)2s(aq)+srcl2(aq)→

Questioned by maham237 @ in Chemistry viewed by 456 persons