which of these is an example of a chemical change?
Answer:
No answer choices but Chemical changes are changes in which can't be undone an example would be a rotting food(won't be fresh ever again) or burning paper(ashes are ashes not paper)
Explanation:
Hope this helps :D
stoichiometry:
You conduct the following precipitation reaction in a lab:
CoCl₂ + 2NaOH → 2NaCl + Co(OH)₂
If you react 10.0 mL of 1.5 M CoCl₂ with plenty of NaOH, how many grams of Co(OH)₂ will precipitate out?
1.4 g Co(OH)₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Unit 0
Base 10 decimal systemAtomic Structure
Reading a Periodic TableMolarity = moles of solute / liters of solutionAqueous Solutions
States of MatterPrediction Reactions RxNStoichiometry
Using Dimensional AnalysisAnalyzing Reactions RxNExplanation:Step 1: Define
[RxN - Balanced] CoCl₂ + 2NaOH → 2NaCl + Co(OH)₂
[Given] 10.0 mL, 1.5 M CoCl₂
[Solve] grams Co(OH)₂
Step 2: Identify Conversions
[Base 10] 1000 mL = 1 L
[RxN] 1 mol CoCl₂ → 1 mol Co(OH)₂
[PT] Molar Mass of Co - 58.93 g/mol
[PT] Molar Mass of O - 16.00 g/mol
[PT] Molar Mass of H - 1.01 g/mol
Molar Mass of Co(OH)₂ - 58.93 + 2(16.00) + 2(1.01) = 92.95 g/mol
Step 3: Stoich
[DA] Convert mL to L [Set up]: [tex]\displaystyle 10.0 mL(\frac{1 \ L}{1000 \ mL})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 0.01 \ L[/tex][DA] Find moles of CoCl₂ [Molarity]: [tex]\displaystyle 1.5 \ M \ CoCl_2 = \frac{x \ mol \ CoCl_2}{0.01 \ L}[/tex][DA] Solve for x [Multiplication Property of Equality]: [tex]\displaystyle 0.015 \ mol \ CoCl_2[/tex][DA] Set up [Reaction Stoich]: [tex]\displaystyle 0.015 \ mol \ CoCl_2(\frac{1 \ mol \ Co(OH)_2}{1 \ mol \ CoCl_2})(\frac{92.95 \ g \ Co(OH)_2}{1 \ mol \ Co(OH)_2})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1.39425 \ g \ Co(OH)_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs as our lowest.
1.39425 g Co(OH)₂ ≈ 1.4 g Co(OH)₂
Answer:
1.4 g Co(OH)₂
Explanation:
Molar mass of Co(OH)₂ = (58.9 + 16.0×2 + 1.0×2) g/mol = 92.9 g/mol
According to the given equation, mole ratio CoCl₂ : Co(OH)₂ = 1 : 1
No. of moles of CoCl₂ reacted = (1.5 mol/L) × (10.0/1000 mol) = 0.015 mol
No. of moles of Co(OH)₂ precipitated = 0.015 mol
Mass of Co(OH)₂ precipitated = (0.015 mol) × (92.9 g/mol) = 1.39 g / 1.4g
====
OR:
(1.5 mol CoCl₂ / 1000 mL CoCl₂ solution) × (10.0 mL CoCl₂ solution) × (1 mol Co(OH)₂ / 1 mol CoCl₂) × (92.9 g Co(OH)₂ / 1 mol Co(OH)₂)
= 1.39 g Co(OH)₂ / 1.4 g Co(OH)₂
The number of protons and neutrons an element has?
Answer:
atomic mass
Explanation:
protons and neutrons have mass; electrons do not (or at the very least have negligible mass by comparison)
In the levels of organization of plants, What are the 2 tissues and their functions?
Question 5
U
4 pts
Picture a neutral Na atom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
Answer:
it will have 1 valence electron as its in the first group in the periodic table.
It will lose electrons as its easier.
The charge will be 1+ as it lost 1 .
Does the equation describe a chemical change or a physical change? Explain your reasoning.
C17H17ON3(s) + 2C4H6O3(l) - -> C21H21O5N(s) + 2C2H4O2(l)
Answer:
Chemical change
Explanation:
There are types of changes in nature namely: physical change and chemical change. A physical change is a change that does not alter the chemical composition of the substances involved, hence, no new substances are formed. On the other hand, a chemical change changes the chemical composition of the involved substances to form new substances.
Based on the definition of the types of changes below, the equation depicted in this question is a CHEMICAL CHANGE because it involves a rearrangement of the atoms of each element in the reactants to produce new sets of products with a new chemical formula.
C17H17ON3(s) + 2C4H6O3(l) → C21H21O5N(s) + 2C2H4O2(l)
write the condensed, complete, and net ionic equations for any reaction that occurs between K2CrO4(aq) and Fe(NO3)3(aq).
Answer:
Condensed equation: [tex]3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)[/tex]
Complete ionic equation : [tex]6K^+(aq)+3CrO_4^-(aq)+2Fe^{2+}(aq)+6NO_3^-(aq)\rightarrow Fe_2(CrO_4)_3(s)+6K^+(aq)+6NO_3^-(aq)[/tex]
Net ionic equation : [tex]3CrO_4^-(aq)+2Fe^{2+}(aq)\rightarrow Fe_2(CrO_4)_3(s)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
[tex]3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)[/tex]
Condensed equation : [tex]3K_2CrO_4(aq)+2Fe(NO_3)_3(aq)\rightarrow Fe_2(CrO_4)_3(s)+6KNO_3(aq)[/tex]
Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.
[tex]6K^+(aq)+3CrO_4^-(aq)+2Fe^{2+}(aq)+6NO_3^-(aq)\rightarrow Fe_2(CrO_4)_3(s)+6K^+(aq)+6NO_3^-(aq)[/tex]
Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations. Spectator ions are the ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
[tex]3CrO_4^-(aq)+2Fe^{2+}(aq)\rightarrow Fe_2(CrO_4)_3(s)[/tex]
please help me asap! (brainliest)
Answer:
Es so es na formula pero te balto la convinasiones de la formula
write the balanced equation for the formation of carbon dioxide.
HELP ME NOW PLEASE 80 points
Answer:
1. Algae
2. Insects
3. Crayfish
4. Trout
5. Herons
Explanation:
Answer:
id.k sorry
Explanation:
Can you identify a chemical only by knowing its physical properties?
Answer:
Any characteristic that can be determined without changing the substance's chemical identity. chemical property: Any characteristic that can be determined only by changing a substance's molecular structure
Explanation:
what is 10x20=???????????? I NEEED HELP
Answer:
The answer for 10 times 20 is 200
Explanation:
Why... Because what is 1 times 2=2 so add the left over zero I'm that your answer!
If a little old lady is doing 98.3 kilometers/hour, will she get a speeding ticket if the speed limit is 55 miles / hour? [USE: 5280 feet = 1 mile and 2.54 cm = 1.00 inch] (Show how to convert to miles / hour, even if your calculator does it for you.)
Answer:
It is possible she could get one.
Explanation:
To solve this problem we need to convert 98.3 kilometers/hour to miles/hour.
In other words, we convert km to mi, to do so we multiply 98.3 km by a conversion factor, putting the unit we want to have in the numerator, and the unit we want to convert in the denominator:
98.3 km * [tex]\frac{1000m}{1km} *\frac{100cm}{1m}*\frac{1in}{2.54cm} *\frac{1ft}{12in} *\frac{1mi}{5280ft}[/tex] = 61 miGiven that the little old lady is doing 61 miles/hour, she could get a speeding ticket.
How many atoms are in 5.62 moles of Mercury?
Answer:
3.384364 time 10^24 atoms
Explanation:
multiply by avogadro's number
write and balance the cellular respiration equation of glucose compared with the photosynthesis reaction in the terms of reactants products energy flow in the significance of each.
Answer:
Explanation:
.
PLEASE HELP!! CHEMICAL EQUATIONS
For each of the following problems, write complete chemical equations to describe the chemical process taking place. Balance the equations and write the state of matter.
2) Magnesium reacts with sodium fluoride to produce magnesium fluoride and elemental sodium.
Answer:
Mg(s) + 2NaF (aq) —> MgF₂ (aq) + 2Na(s)
Explanation:
Magnesium => Mg
Sodium fluoride => NaF
Magnesium fluoride => MgF₂
Sodium metal => Na
The equation can be written as:
Mg + NaF —> MgF₂ + Na
Thus, the above equation can be balance as illustrated below:
Mg + NaF —> MgF₂ + Na
There are 2 atoms of F on the right side and 1 atom on the left side. It can be balance by writing 2 before NaF as shown below:
Mg + 2NaF —> MgF₂ + Na
There are 2 atoms of Na on the left side and 1 atom on the right side. It can be balance by writing 2 before Na as shown below:
Mg + 2NaF —> MgF₂ + 2Na
Mg(s) + 2NaF (aq) —> MgF₂ (aq) + 2Na(s)
Now, the equation is balanced.
Can anyone help w/ this chem problem plz
Answer:
26
Explanation:
Which color of white light bends the least when it is refracted by a prism?
blue
yellow
green
violet
Answer:
Its yellow
Explanation:
When i took the unit practice test it said the correct answer was yellow sooooo
The component of white light that bends the least under refraction by a glass prism is red.
Components of white lightsWhite lights usually have 7 components which include red, orange, yellow, green, blue, and violet.
When light rays pass from one medium to another, is bends due to a difference in the density of the media. This is called refraction.
The components of white light bend when they pass through a glass prism. The extent of bending of each component is dependent on the wavelength of each color.
Red light has the longest wavelength and is thus refracted the least while violet with the shortest wavelength is refracted the most.
More on refraction can be found here:https://brainly.com/question/14760207
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Based on the equation below, how many moles of aluminum sulfate (Al2(SO4)3) will be produced from the reaction of 5.8 moles of aluminum hydroxide (Al(OH)3) and excess sulfuric acid (H2SO4)? 2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O
Answer:
2.9 moles of aluminum sulfate will be produced from the reaction of 5.8 moles of aluminum hydroxide and excess sulfuric acid.
Explanation:
The balanced reaction is:
2 Al(OH)₃ + 3 H₂SO₄ → Al₂(SO₄)₃ + 6 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Al(OH)₃: 2 moles H₂SO₄: 3 moles Al₂(SO₄)₃: 1 mole H₂O: 6 molesThen you can apply the following rule of three: if by reaction stoichiometry 2 moles of Al(OH)₃ produce 1 mole of Al₂(SO₄)₃, then 5.8 moles of Al(OH)₃ how many moles of Al₂(SO₄)₃ will they produce?
[tex]moles of Al_{2} (SO_{4} )_{3} =\frac{5.8moles of Al(OH)_{3} *1 mole of Al_{2} (SO_{4} )_{3}}{2moles of Al(OH)_{3}}[/tex]
moles of Al₂(SO₄)₃= 2.9
2.9 moles of aluminum sulfate will be produced from the reaction of 5.8 moles of aluminum hydroxide and excess sulfuric acid.
Answer:
67
Explanation:
because that right
predict the effect of change in temperature and pressure of the dissociation of PCL5
Answer:
Ps5
Explanation:
Answer:
well the answer to that is climate change
Explanation:
because with climate change the temperature and hot and cold it is depending on where you live
23. What is the molarity of NO3- in each solution?
a. 0.150 M KNO3
b. 0.150 M Ca(NO3)2
c. 0.150 M Al(NO3)3
Answer:
Explanation:
A) 0.150
B) 0.300
C) 0.450
hope it helps:)
Select the correct answer.
Which substance is a source of hydrocarbons?
A.
natural gas
B.
protein
C.
silk
D.
starch
E.
water
Answer:
A. Natural Gas is a substance that is a source of hydrocarbons.
Explanation:
Answer:
option A . hope it helps , thanks
What are the condiction requried for
work to be done
Answer:
the object should be displaced on which the force is applied
Explanation:
HOPE IT HELPS YOU
Rate of diffusion of hydrogen, compared with the gases of air?
Explain your answer using the term mass
Answer:
Graham's law states that the rate of effusion or of diffusion of a gas is inversely proportional to the square root of its molecular weight. So, rate of diffusion of hydrogen gas is four times faster than oxygen gas.
Explanation:
Answer:
Rate of diffusion of hydrogen is higher than other gases because mass of hydrogen is very small and it diffuses easily.
Explanation:
Select all that are compounds.
H2O
CH4
He
O2
NaCl
Answer:
NaCl, H2O
Explanation:
Compounds are substances that contain atoms of two or more different elements.
Which of the following is a natural source of CO2 in the atmosphere?
oil spilled into tropical ocean waters
emissions produced by burning fossil fuels
gases released when plants make food
warm water released from nuclear power plants
Write 5 household products that have hazard symbol/symbols on them.
Answer:
A variety of household products are hazardous. Motor oil, pesticides, oil-based paints, mothballs, flea collars, weed killers, and some household cleaners
of what does sand consist
Answer:
like ground rocks and shells I think.
Explanation:
Which of these careers would a student studying biotechnology
most likely pursue?
A. electrical engineering
B. astronomy
c. agricultural research
D. geology
Agricultural research careers would a student studying biotechnology most likely pursue. Therefore, option C is correct.
What is agricultural research ?The United States Department of Agriculture's main internal research organization is the Agricultural Research Service. One of the four organizations in the USDA's mission area for research, education, and economics is ARS.
A wide definition of agricultural research is any research activity that aims to increase crop output and quality through genetic improvement, improved plant protection, irrigation, storage techniques, farm mechanization, effective marketing, and better resource management.
Agricultural research's main goals are to advance knowledge and advance technology. It deepens comprehension of the linkages and interconnectedness between farming communities and production systems.
Thus, option C is correct.
To learn more about agriculture research, follow the link;
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how many energy levels does a sodium atom have?
the element sodium has 1,000,000 million energy levels. in an electrically neutral sodium atom- there are 3 energy levels.
Answer:
Sodium has 11 electrons. The first two fill the innermost energy level. The second energy level is also full, holding eight electrons and one electron remaining in the outer energy level. It is the number of outer electrons that give an element its chemical properties.
Explanation: