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Chemistry
Page 30
Questions (96,941)
Calculate the heat of formation of propane if the heat of combustion is -2220kj/mol.The heat of formation of carbon (IV) Oxide
1 answer
asked by
Peter Omato
124 views
Constant-volume calorimeters are sometimes calibrated by running a combustion reaction of known ΔE and measuring the change in
4 answers
asked by
Kales
2,531 views
If 10mL of 1 M HCl is added to 1L of 0.01 M phosphate buffer, pH 7.2, what is the resulting pH?
Also what are the conc of
2 answers
asked by
Liam
1,092 views
Determine the concentration of iron in an aqueous solution containing 0.2810 grams of Fe(NH4)2(SO4)2 per liter of solution.
4 answers
asked by
jenine
603 views
1) Copy and complete:
Two particles can react together only if they …… and the …… has enough …… to be ……. 2) What
5 answers
asked by
fiyin
1,349 views
Lovastatin (C24H36O5) has a molar mass of 404.53 g/m. The normal dose of the drug lovastain is 20mg. How many molecules of
2 answers
asked by
Michelle
830 views
Urea: (NH2)2CO
1. Which bonds in the molecule are polar and which are nonpolar? 2. What is the most polar bond in the molecule?
4 answers
asked by
Jashmid
3,605 views
Consider the chemical reaction: H2SO4(aq) +2 NaOH(aq) → 2 H2O(l) + Na2SO4(aq)
If the sulphuric acid is reacting at a rate of
6 answers
asked anonymously
50 views
Carbon dioxide gas and liquid water form solid glucose (C6H12O6) and oxygen gas during photosynthesis. Chlorophyll absorbs light
3 answers
asked by
Ceamus Angelina
3,330 views
18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How
3 answers
asked by
fredrick
2,358 views
How many grams of a solid mixture containing strontium chloride would one need to make 558 mL of a 0.100 M strontium chloride
4 answers
asked by
Anonymous
2,296 views
Why is trioxonitrate v acid not used for preparing hydrogen from metals
3 answers
asked by
Gb
2,024 views
When 50 g of silicon dioxide is heated with an excess of carbon, 32.2 g of silicon carbide is produced. what is the percent
4 answers
asked by
Meg
1,879 views
HA and HB are two strong monobasic acids. 25cm3 of 6moldm-3 Ha is mixed with 45cm3 of 3moldm-3 HB. What is the H+ concentration
3 answers
asked by
zainab
1,394 views
Calculate the value of the solubility product (Ksp) for CdS given the following standard reduction potentials:
CdS + 2e- --> Cd +
1 answer
asked by
Andrew
1,170 views
Find the expression for the solubility product of silver oxalate Ag2C2O4).
2 answers
asked by
Anonymous
1,112 views
How many pi bonds and sigma bonds are present in ritalin?
3 answers
asked by
Ryan
1,101 views
Calculate the average C—C bond strength in cyclopropane (in kJ/mol). Its combustion and the experimental enthalpy of reaction
1 answer
asked by
JUNDY
1,078 views
Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy.
Which type of reaction has a higher
2 answers
asked by
Samado
1,033 views
A student cuts some fabric into two pieces. Is this change physical or chemical?(1 point)
Responses It is a chemical change
1 answer
asked by
Kanna
93 views
How does a balanced chemical equation demonstrate the Law of Conservation of Mass?
it shows that the properties of the elements
1 answer
asked by
annoymous
71 views
Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes.
5 answers
asked by
Anonymous
963 views
H3PO4 + 3KOH = K3PO4 + 3 H2O What would be the percent yield if you reacted 49.0g of H3PO4 with 112g of potassium hydroxide, and
1 answer
asked by
andi
880 views
Calculate the cell potentials for the following voltaic cells:
2Al (s) + 3Cu 2+ (aq) → 2Al 3+ (aq) + 3Cu (s) 3Mg (s) + 2Al 3+
2 answers
asked by
Jazzy
593 views
An unknown metal chloride with the formula MCl3 undergoes electrolysis using a current of 6.50A for 1000 s and desposits 1.56g.
1 answer
asked anonymously
50 views
A student compiled data in a table to compare pure substances and mixtures.
Pure substances: Elements and compounds cannot be
1 answer
asked anonymously
83 views
A sample of anhydrous copper2 sulphate on analysis was found to contain 6.4grams of copper,3.2grams sulphur and 6.4grams oxygen
1 answer
asked by
Mash
27 views
An element x has a relative atomic mass of 88. When a current of 0.5 ampere was passed through the fused chloride of x for 32
1 answer
asked anonymously
28 views
5 of 145 of 14 Items
Question If the amount of carbon dioxide (CO2) in a workplace is greater than 1,000 parts per million (ppm),
1 answer
asked by
A n I m e*
32 views
According to collision theory, which of these is not required for particles to react?
the particles must react with sufficient
1 answer
asked anonymously
52 views
Why is copper considered to be a very valuable natural resource?(1 point) Responses Copper conducts electricity well so it can
1 answer
asked anonymously
45 views
Using the periodic table, Maria drew a diagram of a neon atom. The diagram shows what Maria drew.
Which mistake did Maria make on
1 answer
asked by
Disiirl
39 views
Using the information from the Periodic Table of Elements, identify the correct numbers of subatomic particles for one atom of
1 answer
asked anonymously
20 views
The reactants in a chemical equation have 4 potassium atoms, 3 oxygen atoms, and 2 iron atoms. According to the law of
2 answers
asked anonymously
44 views
Sharon combines potassium (K) and water (H2O), producing potassium hydroxide (KOH) and hydrogen(H2), as shown in the chemical
1 answer
asked by
icky^33
54 views
Katie found a sample of an unknown solid. She performed a series of experiments to determine some of its properties. Her
1 answer
asked by
dee
50 views
A person mixes two liquids together as shown in the illustration below.
Clear Yellow solid Substance X Mass 150 g Substance Y
3 answers
asked by
Cupidsvz
55 views
There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be
1 answer
asked anonymously
26 views
All the statements about metals are accurate except
a. metals are good conductors of heat and electricity b. metals are ductile
1 answer
asked anonymously
25 views
Use the provided figure to answer the question below.
Using the information from the Periodic Table of Elements, identify the
1 answer
asked by
hi :)
21 views
Use the periodic table of elements below to answer the following question.
A scientist has compiled the table below to show the
1 answer
asked by
hi :)
30 views
Diagram of electroplating of a steel spoon with silver metal.
1 answer
asked by
Feri
9 views
Write the anode and cathode reactions of an electrolytic cell using concentrated sodium chloride solution (>2.0M)
1 answer
asked anonymously
13 views
Use the chemical equation to complete the activity.
2Cu+S→Cu2S Copper (Cu) reacts with sulfur (S) to form copper sulfide as
1 answer
asked by
anon
37 views
Which of the following describes a positive correlation? (1 point)
Responses As the amount of heat increases, the amount of water
1 answer
asked anonymously
38 views
Which best describes a covalent bond?(1 point)
Responses Multiple atoms bond together, whether they are the same element or not.
7 answers
asked by
i dont like boys
22 views
How is fission different from a simple chemical reaction?(1 point)
Responses Fission reactions run out of control, while chemical
1 answer
asked by
the
25 views
would you expect barium to react with HCl acid faster or slower than calcium
1 answer
asked anonymously
6 views
What is the solubility of x in mol dm if 25cm of it's saturated solution contains 4.og of x?(x=60g mol)
1 answer
asked by
Ayomide
218 views
The indicator methyl red has a pKHIn = 4.95. It changes from red to yellow over the pH range from 4.4 to 6.2.
If the indicator is
4 answers
asked by
cp
142 views
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