Answer:
308,4796 g.
Explanation:
1 mol equals to 107,86 g, now times 2,86 mol, 308,4796 g.
Round the following numbers to the number of significant figures indicated:
345 (2 s.f.) ___________
7850 (1 s.f.) ___________
24.68 (3 s.f) ___________
8.005 (3 s.f) ___________
0.005758 (3 s.f) ___________
1.25x1012 (2 s.f) ___________
Explanation:
Above we have simply looked the condition that where we put decimal point that gives your needed answer after round off.
For example:
we have to make 2 s.f from 345 so we kept decimal after 3 and we rounded off to make 3.5 from 3.45
Hope you got it
Chemists use letters of the alphabet as ____ for the elements.
Answer:
The symbol is the right answer.
Explanation:
The “ Symbol” is the correct answer because chemist uses the letters of the alphabet to denote the element. For instance, the element oxygen is denoted by the letter of the alphabet “O”, the hydrogen is denoted by the letter of alphabet “H”, Boron is denoted by the letter of alphabet “B”, etc. Here these are the examples that use one letter but there are other elements that use more than 1 letter as the symbol. For example, the Chlorine is represented by the Cl.
The letters of the alphabet are used by chemists as symbols in chemistry.
Symbols in chemistryThe “ Symbol” is the correct answer because the chemist uses the letters of the alphabet to denote the element. For instance, the element sulfur is denoted by the letter of the alphabet “S”, the hydrogen is denoted by the letter of the alphabet “H”. Other elements that use more than 1 letter as the symbol. For example, Chlorine is represented by the Cl.
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What do models of molecules and extended structures show?
Answer:
Examples of extended structures could include sodium chloride or diamonds. Examples of molecular-level models could include drawings, 3D ball and stick structures, or computer representations showing different molecules with different types of atoms. ... Examples of models could include drawing and diagrams
Explanation:
For the reaction: CO(g) + H2O(g) ⇌ CO2(g) + H2(g) the value of Kc is 1.845 at a specific temperature. We place 0.500mol CO and 0.500mol H2O in a 1.00L container at this temperature and allow the reaction to reach equilibrium. Determine the equilibrium concentration of all species present in the container.
Answer:
Explanation:
In the equilibrium:
CO(g) + H₂O(g) ⇄ CO₂(g) + H₂(g)
Kc is:
Kc = 1.845 = [CO₂] [H₂] / [CO] [H₂O]
Where [] are equilibrium concentrations of each species
Initial concentrations:
[CO] = 0.500mol / 1.00L = 0.500M
[H₂O] = 0.500mol / 1.00L = 0.500M
In equilibrium, concentrations will be:
[CO] = 0.500M - X
[H₂O] = 0.500M - X
[CO₂] = X
[H₂] = X
Where X is reaction coordinate. The amount of reactant that reacts producing products.
Replacing in Kc expression:
1.845 = [CO₂] [H₂] / [CO] [H₂O]
1.845 = [X] [X] / [0.500M - X] [0.500M - X]
1.845 = X² / X² - X + 0.25
1.845X² - 1.845X + 0.46125 = X²
0.845X² - 1.845X + 0.46125 = 0
Solving for X:
X = 0.288M; Right solution
X = 1.9M; False solution: Produce negative concentrations.
Replacing, equilibrium concentrations are:
[CO] = 0.500M - X = 0.212M
[H₂O] = 0.500M - X = 0.212M
[CO₂] = X = 0.288M
[H₂] = X = 0.288M
When a change in a physical property is observed, Select the correct answer below: it could be because of a physical change. it must be because of a chemical change. it must be because of a chemical change and a physical change. it could be caused by a change that is considered both physical and chemical.
Answer:
It could be because of a physical change.
Explanation:
A physical change affects a substance's physical properties, and a chemical change affects its chemical properties.
an atom has 23 protons, 25 neutrons and 23 electrons.
what is the element symbol
what is the atomic number
what is the mass number
Element symbol V
Atomic Number 23
Mass Number 50.9415
What is the atomic number?The atomic number is the number of protons in the nucleus of an atom.
Vanadium is a chemical element with the symbol V and atomic number 23. Classified as a transition metal, Vanadium is a solid at room temperature.
Hence,
Element symbol V
Atomic Number 23
Mass Number 50.9415
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Hi! I need help on 1-4 ASAP! Thanks!
Answer:
5. a. false b. true c. false d. true e. false
6. it has to be something that can be supported or refuted through carefully crafted experimentation or observation
the pencil is material or mixture ?please help
Answer:
mixture
Explanation:
How does carbon dioxide gas in the atmosphere cause climate change?
When 2891 is written in scientific notation, the exponent indicating the power of
10 is?
Answer:
For numbers less than 1, the power of 10 in scientific notation has negative exponent and for numbers greater than 1, the power is either zero or has positive exponent. Explanation of Solution The given number is 2891, to write the scientific notation, decimal should be placed after first non-zero digit.
Explanation:
0.056 g/s = ? g/min
WILL GIVE BRAINLETS
What is one element a topographic map shows? A.Climate B.Landforms C.Space D.Weather
Answer:
B
Explanation:
landforms.....this is it
6 A student has a mass of 6.35 x 10^1 kg. What number below is the
equivalent to the student's mass? *
O A. 6.35 x 10^-2 g
B. 6.35 x 10^4 g
O C.635 g
O D. 215 lb.
Answer:
B. 6.35 x 10^4 g
Explanation:
Quantities such as mass have more than units that are interconvertible. Mass can be measured in kilograms (kg), grams (g), etc.
However, 1kg equals 1000grams
Hence, a measurement of 6.35 x 10^1 kg will be equivalent to grams (g) by multiplying by 1000units
That is, 6.35 × 10^1 × 1000
= 6.35 × 10^1 × 10^3
Multiplication in index means to add the powers
= 6.35 × 10^ (1+3)
= 6.35 × 10^4grams
Therefore, an equivalent measurement of 6.35×10^1 kg is 6.35×10^4 g.
what are 2 examples of ethical research behaviour?
Answer:
Respect ConfidentialityExplanation:
*Hope this helps*
Convert 1.4 x 10-4 cm to decimeters
Answer:
1.4 x 10^-5 dm
Explanation:
Centimeters (cm) and decimeters (dm) are interconvertible S.I units of length.
- A centimeter is one-hundredth of a meter i.e. 100cm = 1m
- A decimeter is one-tenth of a metre i.e. 10dm = 1m
Based on this, a centimeter is one-tenth of a decimeter i.e. 1dm = 10cm
Hence, to convert 1.4 x 10^-4 cm to dm, we divide the value by 10
= 1.4 x 10^-4 ÷ 10
= 0.00014 ÷ 10
= 0.000014
Convert back to scientific notation by counting the decimal point forward to have: 1.4 x 10^-5
Hence, 1.4 x 10^-4 cm is equivalent to 1.4 x 10^-5 dm.
two difference between rhombic and monoclinic sulphur
Answer:
The key difference between rhombic and monoclinic sulphur is that the rhombic sulphur is the most stable allotropic form of sulphur that exists as rhombic octahedral crystals whereas the monoclinic sulphur exists as long, needle-shape prisms but, it is stable only at temperatures between 96◦C and 119◦C.
Explanation:
Thanks . I hope you got help
Your lab partner accidentally spills some acid on his wrist and watchband. You should: (Check all that apply.)
Answer: Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. Let the TA inspect his wrist to see if it is okay.
Explanation:
The question is incomplete, the choices are:
a. Take him to the safety shower, and make sure he stands under it for at least 15 minutes to be sure all hazardous material has been washed away. b. Remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. c. Let the TA inspect his wrist to see if it is okay.
d. Rinse the watch band before allowing him to put it back on.
An acid is traditionally considered to be any chemical compound that, when dissolved in water, produces a solution with greater hydronium cation activity than pure water, i.e., a pH less than 7. Both corrosive acids (and also corrosive bases) are capable of destroying skin by catalyzing the hydrolysis of fats, which are chemically esters. Also, when acids attack metals, hydrogen gas is often released.
This is why your lab partner should remove the watch and watchband immediately, and rinse his wrist for at least 15 minutes to be sure all hazardous material has been washed away. This ensures that the acid is can not damage the skin. And also the person should make sure that someone qualified checks it to see if it is okay.
what is the color of the sun? (wrong answers only!) haha [drop ur instagram so we can be friends! :)]
Answer:
I need points for my Ap Calculs class
Explanation:
bsbsjsjsjd
Answer:
pink ;)
Explanation:
the.alyssayork
Classify the following changes as physical or chemical changes. a. Water boils. b. Salt dissolves in water c. Milk turns sour d. A metal rusts.
Answer:
Water boils - physical change
Salt dissolves in water- chemical change
Milk turns sour- chemical change
metal rusts - chemical change
Explanation:
A chemical change refers to changes that are irreversible and the process involves the evolution of heat along with the formation of a new substance, examples include;Salt dissolves in water, Milk turns sour, metal rusts etc
The boiling of water is a physical change. The water can be cooled and the vapour condensed,hence, the boiling of water is a physical change.
Physical changes are easily reversible and no new substance is formed.
As you move from left to right across a period, what happens to the atomic radil?
Answer:
Moving Across a Period
Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons
Which of the following can be formed by physically combining pure substances? a. an element c. a compound b. a mixture d. all of the above
Answer:Which of the following can be formed by physically combining pure substances?a. an element c. a compound b. a mixture d. all of the above Weegy: It is true.The formula for Density is Mass divided Volume.
Explanation:
Answer:
It is B. a mixture
Explanation:
A is wrong because an element is part of a compound and can't be physically mixed, C is wrong because atm don't jin by just physically mixing then there must be a change in smething at the physical level
also correct on edg.
What does this diagram represent? (4 points) A glycerol molecule losing an H atom, and a fatty acid chain losing OH, forming H2O. 1. A saturated fat becoming unsaturated 2. A fat molecule forming through dehydration synthesis 3. The saturation of a triglyceride molecule 4. Dehydration synthesis breaking down a fat molecule
Answer:
This question is incomplete because of the absence of the diagram
Explanation:
The absence of the diagram makes the question incomplete, but it appears as if the content of the diagram has been described in the question (which is not totally clear).
The description provided in the question suggests the loss of a water during the formation of a triglyceride. This process described here is called dehydration synthesis. Dehydration synthesis is the process of joining two substances/compounds together leading to the loss of water molecule in the process.
From the explanation above, the correct option is 2. The fat molecule being formed is the triglyceride (through the process of dehydration synthesis).
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times How many kilometers do you swim?
Answer:
You would swim 200 time's.
Hope this help's :)
An Olympic swimming pool is 50 meters long. You swim from one end to the other four times, and the kilometers that you swim are 200 kilometers.
What are meters and kilometers?Meters are kilometers are measurement units used to measure length. They are used to write the value of the measurements. There are seven basic units of measurement. The values are liters, kg, meters, grams, milliliters, etc.
Meter is a SI unit, it is denoted by small m, kilometers is unit of length which is denoted by km. The SI unit is the internation unit system of measurement.
One meter is equals to 1000 kilometers. An Olympic swimming pool is 50 meters long. A person swims 4 time of 50 kilometers.
So, 50 x 4 = 200 km.
Thus, the kilometers that you swim are 200 kilometers.
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Solid aluminum hydroxide is added to a solution of potassium phosphite.
Give the following
Complete reaction
Complete ionic equation
Net ionic equation
Answer :
The complete balanced equation will be,[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]
The complete ionic equation in separated aqueous solution will be,[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]
The net ionic equation will be,[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]
Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The complete balanced equation will be,
[tex]Al(OH)_3(aq)+K_3PO_3(aq)\rightarrow AlPO_3(s)+3KOH(aq)[/tex]
The complete ionic equation in separated aqueous solution will be,
[tex]Al^{3+}(aq)+3OH^{-}(aq)+3K^{+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)+2K^+(aq)+3OH^{-}(aq)[/tex]
In this equation, [tex]K^+\text{ and }OH^-[/tex] are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,
[tex]Al^{3+}(aq)+PO_3^{3-}(aq)\rightarrow AlPO_3(s)[/tex]
Find 6 examples of where chemistry and agriculture work together
Answer:
Chemistry deals with compounds, both organic and inorganic, and agriculture deals with the production of organic products using both organic and inorganic inputs Thus Chemistry forms an integral part of agriculture from molecular to organ level.
Explanation:
i hope this helps you! Have a nice day <33
Answerfcsdv fb fd
Explanation:
What keep forest fries burning so long?
Why do some forest fires get so large?
Why are the forest fires large some years and not other years.
Why are California forest fires getting worse?
Answer:
1. The warming climate has dried out California's landscape, turning it into a tinderbox. ... This is due in part to climate change: rising temperatures, have an exponential impact when it comes to setting the stage for catastrophic wildfires,
2. Due to the heat and temperature of the place and if the place is very dry.
3. It all depends on the weather. At times there can be less rain whereas at time there is a lot of rain or how much heat it is outside within years
4. Well California is really hot during the summer and it becomes really dry so that is the reason forest fires are getting worse
can anyone do these problems?
Answer:
-76
296
228
603
485
Explanation:
Subtract 273 to 200 to get -76
add 273 to 23 to get 296
add 273 to -45 to get 228
subtract 273 to 876 to get 603
add 273 to 212 to get 485
How could the survivors about starting a fire?
What is fire?Describe it.
What makes a fire hot?
Answer:
The ancient Greeks believed that fire was one the four basic elements that composed all things in the universe. In the mythology of virtually every culture, fire is a sacred substance that gives life or power. Fire is not, in fact, a substance. When you gaze at the leaping flames of a campfire, you’re observing not an object, but a process – a chemical reaction. It’s the same chemical reaction that occurs when a cut apple left on the counter turns brown, when silver tarnishes or when an iron nail rusts.
That process is oxidation: combining oxygen with another substance. The defining difference between a fire and your half-eaten apple is speed: fire is an oxidation process that happens very fast, so that light, heat and sound are released — often with enough force and majesty to justify the ancients’ reverence.The sudden release of energy causes temperatures to rise, sometimes by thousands of degrees. And it also results in smoke, the toxic waste of fire’s leftovers.
The fire triangle and the fire tetrahedron
Fire TetrahedronThe fire triangle identifies the three needed components of fire:
fuel (something that will burn)
heat (enough to make the fuel burn)
and air (oxygen)
Explanation: i hope this helps sry its long
Tokyo, Japan is 8817.6 km from California. how many millimeters is this? answer in scientific notation.
Answer:
[tex]d=8.817\times 10^9\ mm[/tex]
Explanation:
It is given that,
Japan is 8817.6 km from California. We need to convert this distance in millimeters.
We know the conversion from km to mm is as follows :
1 km = 1000000
To convert mm km to mm use the unitary method as follows :
8817.6 km = 8817.6 × 1000000
[tex]d=8.817\times 10^9\ mm[/tex]
Hence, the distance between Japan and California [tex]8.817\times 10^9\ mm[/tex].
Plzzzzz help!!!!
Use complete sentences to differentiate between acids and bases on the basis of their behavior when dissolved in water. Give an example of each type.
Explanation:
Hey there!!
The differences between them are:
The acids are the substances which produces hydrogen ion dissolving in water. Eg: [tex]h2so4 = 2 {h}^{ + } + s {o4}^{ - - } [/tex]Base are the substances which produces hydroxyl ion while dissolving in water. Eg:[tex]naoh = {na}^{ + } {oh}^{ - } [/tex]Hope it helps....