Determine the rate of reaction at 50 C when the loss of mass is 0.95 g. Show your working. Give your answer to 2 significant figures.
* 20 points for who gets it *
Answers
This problem is providing information about the loss of mass for a reaction 50 °C as a function of the time elapse. Thus, when taking a look at the given graph, we can trace a horizontal line on the y-axis at 0.95 g in order to intercept it with the curve, and hence, figure out the time at which that loss of mass takes place.
Thus, we can see that when the loss of mass hits 0.95 g, the corresponding time on the graph is about 80 seconds, and hence, the rate of reaction turns out to be:
[tex]r=\frac{0.95g}{80s}\\\\r=0.012\frac{g}{s}[/tex]
Which has two significant figures as required.
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why does a diprotic acid dissociate in a stepwise manner
Answers
Because they have the ability to supply exactly two protons.
Hope this helps!
A diprotic acid dissociates in a step wise manner as it has two protons and it looses one proton each in each dissociation step.
What are acids?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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82. How many moles of calcium are in 3.82g of calcium?
Answers
Moles= 3.82/40
Moles= 0.0955 mol
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chemical equations for sodium sulphate, potassium sulphate, magnesium sulphate, calcium sulphate
Answers
Explanation:
2NaOH + H2SO4 --> Na2SO4 + 2H2O
2KOH + H2SO4 --> K2SO4 + H2O
Mg(OH)2 + H2SO4 --> MgSO4 + 2H2O
Ca(OH)2 + H2SO4 --> CaSO4 + 2H2O
how long to bring cream cheese to room temperature?
Answers
Answer:
about an hour but it might take a little longer it jist depends
the number of neutrons in the nucleus of an atom can be determined by
Answers
Answer:
To calculate the number of neutrons, subtract the atomic number (which equals the number of protons) from the mass number.
hope this helps☆☆☆
2. What physical force causes suspensions to settle
Answers
Hello!
Answer:
Gravity
Explanation:
It can settle down and separate over time due to gravity.
Hope this helps! Have a great day!
mixture requires constant shaking to keep its constituents combined. It is best described as a _____.
homogenous mixture
colloid
suspension
solution
Answers
Answer:
[tex] \tiny \tt \: [/tex]
Suspension
Explain why reaction speed increases with temperature.
Answers
the enthalpy of combustion of gasoline is about 45 kj/g. the amount of energy needed to heat 1 g of water from 20 °c to 100 °c is 80 °c x 4.18/g•°c. the enthalpy of vaporization of water is 2540 j/g. what mass of water at 20 °c can 1 g of gasoline heat and boil?
Answers
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
Now, we know that energy can not be created nor destroyed but it can be converted from one form to another.
The heat produced by the gasoline is equal to the heat gained by water. Mathematically;
1g × 45 × 10^3 = [1 g × 4.18 × (100 - 20) + 2540m]
45 × 10^3 = 334.4 + 2540m
45 × 10^3 - 334.4 = 2540m
m = 45 × 10^3 - 334.4 /2540
m = 17.6 g
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
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How does melting order relate to melting point?
A. The substance that melted the quickest has the highest melting point.
B. The substance that took the longest to melt has the lowest melting point.
C. The substance that melted third to last has the lowest melting point.
D. The substance that took the longest to melt has the highest melting point.
Answers
Answer:
I think A.
Explanation:I say A because of the substance melting the quicking does have the highest melting point because its the highest.
what is the molecular formula of linoleic acid?
Answers
Answer:
C18H32O2
Explanation:
This is it, i hope it helps Good luck.
Which of the following is NOT an example of a communicable disease.
Answers
The none communicable disease in the given option is diabetes
What is a communicable disease?A communicable disease is a type of disease that can be spread from one person to another.
Examples of communicable diseases include;
HIV, Hepatitis (A, B, C) Measles, TuberculosisInfluenzaCommon coldThus, the none communicable disease in the given option is diabetes.
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do not delete i just need help
Answers
Answer:
A. prokaryotic cell
Explanation:
We can easily identify the diagram as prokaryotic cell by the capsule shown. These organisms mostly have capsules.
What was the effect of increasing the water's mass?
Answers
-water has a high capacity
EASY QUESTION (PLEASE HELP THE INTERNET ISN'T SUCH A BIG HELP RIGHT NOW)
Things microscopes have helped scientists discover about cells.
(No links plz)
Answers
Answer:
Adding on to the answer said before, microscopes are pretty much one of the most significant tools used in Biology. It helped discover organelles, and smaller stuff like DNA, and prominently allowed Scientists to discover Bacteria and Archaea, the prokaryotic cells that contribute a big role in the functioning of soil, which is essential for our ecosystem.
Vinegar is an ingredient commonly used by chefs. Scientists also use it as well, although they call it acetic acid. When vinegar is in its liquid or solid (frozen) states, it has a fixed volume. But when vinegar is in its gas state, it takes up the entire volume of whatever container it is in. This is why you can smell an open bottle of vinegar the minute you walk into a kitchen, even though you cannot actually see the gas particles!
Which statement best explains why the volume of vinegar gas is changeable as opposed to the fixed volume of its solid and liquid states?
A. Gas particles are always at a higher pressure than solids and liquids.
B. Gas particles are always at a higher temperature than solids and liquids.
C. Gas particles are spaced far apart and can move freely.
D. Gas particles stay close together but can move around each other.
Answers
Answer: C
Explanation: Because gas particles are free to move fast where as liquid can move a little but solid cant so it would be C
Hope it helps
please help me with the second image questions it is really important and I really need it please help me out and provide me the answers for the second image two questions, looking at the first image please.
Answers
Answer:
is this exam.. are you coping..
What is Art Conservation?
Answers
Answer:
The conservation and restoration of cultural property focuses on protection and care of cultural property, including artworks, architecture, archaeology, and museum collections. Conservation activities include preventive conservation, examination, documentation, research, treatment, and education
Explanation:
this is the correct answer
Why is seawater and corn syrup denser than the egg? explain plz no link
Answers
What is the density of a bowling ball with a mass of 3.0 kg and a volume of 0.0050 m 3 ?
0.002 kg/m 3
0.015 kg/m 3
500 kg/m 3
600 kg/m 3
Answers
Answer:
600 kg/m³
Explanation:Formula to used = m/v
[] d is the density
[] m is the mass
[] v is the volume
Solving[Formula] d = m/v
[Plug-in] d = 3/0.0050
[Divide] d = 600 kg/m³
Answer0.002 kg/m³
0.015 kg/m³
500 kg/m³
600 kg/m³
Have a nice day!
I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly. (ノ^∇^)
- Heather
Answer:
[tex]\boxed {\boxed {\sf 600 \ kg/m^3}}[/tex]
Explanation:
We are asked to find the density of a bowling ball. The density of an object is its mass per unit volume. It is calculated by dividing the mass by the volume.
[tex]\rho= \frac{m}{v}[/tex]
The mass of the bowling ball is 3.0 kilograms and the volume is 0.0050 cubic meters.
m= 3.0 kg v= 0.0050 m³Substitute the values into the formula.
[tex]\rho= \frac{3.0 \ kg}{0.0050 \ m^3}[/tex]
Divide.
[tex]\rho= 600 \ kg/m^3[/tex]
The density of the bowling ball is 600 kilograms per cubic meter.
please help for a brainlist
Answers
Answer:
Is D
Explanation:
hope this is helpful
An electron moved from a lower energy level to a higher energy level. What most likely happened during the transition? (4 points)
Group of answer choices
A random amount of light was released.
A fixed amount of energy was absorbed.
A fixed amount of energy was released.
A random amount of light was absorbed.
Answers
Answer:
A. A random amount of light was released
Explanation:
A random amount of light was released. Hence, option A is correct.
What are electrons?An electron is a negatively charged subatomic particle. It can be either free (not attached to any atom) or bound to the nucleus of an atom. Electrons in atoms exist in spherical shells of various radii, representing energy levels. The charge on a single electron is considered the unit electrical charge.
Electrons are sub-atomic particles that occupy energy levels in an atom of any chemical element. These electrons may move from one energy level to another.
Electrons may move from a lower energy level or ground state to an excited state or high energy level, or else move from a higher energy level to a lower energy level.
When an electron moves from a lower energy level to a higher energy level energy is absorbed by the atom, and when the movement is from a higher energy level to lower energy is released mainly as light.
Hence, option A is correct.
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EXPERIMENT 4 : TYPES OF PLATE BOUNDARY
Answers
Answer:
Movement in narrow zones along plate boundaries causes most earthquakes. Most seismic activity occurs at three types of plate boundaries—divergent, convergent, and transform. As the plates move past each other, they sometimes get caught and pressure builds up.
Explanation:
What types of bonds, and how many bonds, do you predict arsenic form with other elements?
Answers
Answer:
The outer-shell similarity of the two elements suggests that arsenic, like phosphorus, can form three covalent bonds per atom, with an additional lone pair of electrons left unbonded.
Atomic number: 96
Oxidation states: +3, +4
Arsenic atom can form either three or five bonds in arsenic compounds.
The number of bonds that an element will form to other elements depends on the number of electrons on the valence shell of that element. Arsenic has five valence electrons on its valence shell.We know that there is one lone pair on the valence shell of arsenic hence, the arsenic atom can form either three or five bonds in arsenic compounds.In conclusion, arsenic is an element that could form three or five bonds in its compounds.
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What will be the primary result of the continuation of the
geologic processes indicated at this location?
Earth's magnetic field will reverse direction.
New oceanic crust will form.
o Continental crust will be forced downward.
Earth's circumference will increase.
Answers
Answer:
B
Explanation:
new oceanic crust will form.
The formation of a new oceanic crust will be the primary result of the continuation of the geologic processes. Therefore, option (B) is correct.
What is the oceanic crust?The oceanic crust can be described as the uppermost layer of the oceanic portion of the tectonic plates. The oceanic crust is composed of the upper oceanic crust, with pillow lavas complex, and the lower oceanic crust, made of troctolite, and ultramafic cumulates.
The oceanic crust lies above the rigid uppermost layer of the mantle. The crust and the rigid upper mantle layer together compose the oceanic lithosphere.
The oceanic crust is rich in iron and magnesium and composed of mafic rocks. It is thinner than the continental crust less than 10 Km thick but it is denser with 3.0 g/cm³ as opposed to the continental crust.
The oceanic crust displays a symmetrical pattern of positive and negative magnetic lines emanating from the mid-ocean ridge.
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Based on the periodic table, what is the oxidation number of oxygen (Group VI, period 2) in compounds? a) 0 b) +2 C) -2 d) 1
Answers
The oxidation number of oxygen (Group VI, period 2) is -2.
The electrical charge of an atom describes its Oxidation number.\The number of electrons that must be gained or lost in an atom's valence electron shell to make it to be filled or half-filled gives us the oxidation number value.When the atom gains electrons,it acquires a negative oxidation number. When the atom loses electrons,it acquires a positive oxidation number
Oxygen has 8 electrons with {He] 2s² 2p⁴ configuration. With 6 electrons in its valence shell, it need to gain 2 electrons to achieve stability, When it gains 2 electrons, it acquires a negative oxidation number of -2.
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How much mass does 1 mol of O2 gas have?
Answers
Answer: 15.99 x2g
Explanation:
27/13Al how many electron does one atome of this element contain
Answers
Answer:
An aluminium atom contains 13 electrons.
how does the body and brain react when u are developing feelings for someobody?
Answers
Wish you the best of luck for whoever you have feelings for :)
how many moles of iron are present in 3.15 × 10^24 atoms of iron?
Answers
Answer:
5.23 moles
Explanation:
How many moles of iron are present in 3.15 × 10^24 atoms of iron?
1 mole has 6.02 X 10^23 particles
so
3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =
5.23 moles