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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An irregularly shaped stone was lowered into a graduated cylinder holding a volume of water equal to 2 ml. The height of the water rose to 7 ml. If the mass of the stone was 25 g, what was its density?
Answers
To get the density, divide the mass of the stone by its volume:
D = m/v = (25 g)/(5 cm^3) = 5 g/cm^3
The density of the stone is 5 grams per cubic centimeter.
Hope this helps!
What would be the bond angle if the molecular geometry were bent and had only one lone pair of electrons
Answers
120°
Bent molecular geometry
Examples H2O, SO2
Point group C2v
Coordination number 2
Bond angle(s) 90°<θ<120°
can someone plaexplain to me what is 'first ionisation energy' in simple words coz my small brain can't understand it
Answers
[tex] \: \: \: \: \: \: [/tex]
the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase.hope it helps[tex] \: \: \: \: \: [/tex]
An atom, X, contains 16 protons.
Which statement about Z is correct?Explain why.
A) It cannot form an ion.
B) It contains 6 electrons in the outer shell.
C) It contains 6 neutrons.
D) It had relative atomic mass of 16.
Answers
Answer:
B
Explanation: as protons no. = electrons no.= atomic number(Z)
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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1. A substance which takes the shape and volume of its container is a?
Solid
Liquid
Gas
Crystal
Answers
Answer:
Liquid
Explanation:
Liquid
Answer:
Gas
Explanation:
Gas takes the shape and volume of its container because it doesn't have a definite shape or volume.
Liquid is wrong because it takes the shape of its container, but has a definite volume.
Gas is wrong because it has a definite shape and volume.
Crystal is definitely wrong.
How does the microscopic arrangement of particles affect the microscopic behavior of the solution?
Answers
Answer:
In a solid, the particles pack together as tightly as possible in a neat and ordered arrangement. ... With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly. The attractive force in solids need not be stronger than in liquids or gases
Write the balanced chemical equation for the following reaction. Also, classify the
reaction as sythesis, decomposition, single replacement, double replacement, or combustion.
aluminum sulfate + barium chloride —> aluminum chloride + barium sulfate
Answers
Answer:
Reaction: Al2(SO4)3 + 3BaCl2 --> 2AlCl3 + 3BaSO4
Type: Double Replacement
Explanation:
1.) First you need to understand what the different reactions are
a.) Synthesis: is a reaction where two or more substances will combine with each other to make one product.
Ex: A + B → AB
b.) Decomposition: when one compound breaks down into two or more substances. (Opposite of synthesis)
Ex: AB → A + B
c.) Single Replacement: when one element replaces another one in a reaction
Ex: A + BC → AC + B
d.) Double Replacement: when the positively charged cations and negatively charged anions of the reactants trade places. Normally this will be the two outer elements combining and the two inner ones combining.
Ex: AB + CD → AD + CB
e.) Combustion: when a substance reacts with oxygen gas and releases energy as light and heat.
Ex: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
2.) From there you can write out the formula of the different reactants and products and balance the equation.
if 15 grams of carbon is present at the beginning of a reaction,how many grams of carbon will be present in the products?
Answers
The law of conservation states that the mass of the element remains the same during the course of the reaction.
The law of reaction conformed by the following:-
Mass of reactantMass of productAccording to the question, the amount of carbon is 15g in the reactant and the amount will remain same at the end of reaction, which is product that is 15g.
Hence, the amount remain same in the reaction that is 15g.
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Which of the following moves away from the central nervous system?
Afferent Neuron
Efferent Neuron
Proxima Neuron
Distal Neuron
Answers
Answer:
distal
Explanation:
you c a n remember that by the word distance
difference between condensed milk and evaporated milk
Answers
The major difference that sets these two canned milk products apart is sugar content; sweetened condensed milk, as the name implies, is always sweetened, while evaporated milk is unsweetened
What is mechanical energy?
The energy that is associated with the motion or position of an object
The energy that travels in waves from the moon
Any energy that travels through a medium like water
The stored energy in a substance like oil or gasoline
Answers
Answer:
The energy that is associated with the motion or position of an object
or simply kinetic or potential Energy
658 mL of 0.250 M HCl solution is mixed with 325 mL of 0.600 M HCl solution. What is the molarity of the resulting solution
Answers
The molarity of the resulting solution obtained by mixing 658 mL of 0.250 M HCl solution with 325 mL of 0.600 M HCl solution is 0.366 M
We'll begin by calculating the number of mole of HCl in each solution. This can be obtained as follow:
For solution 1:Volume = 658 mL = 658 / 1000 = 0.658 L
Molarity = 0.250 M
Mole of HCl =?Mole = Molarity x Volume
Mole of HCl = 0.250 × 0.658
Mole of HCl = 0.1645 moleFor solution 2:Volume = 325 mL = 325 / 1000 = 0.325 L
Molarity = 0.6 M
Mole of HCl =?Mole = Molarity x Volume
Mole of HCl = 0.6 × 0.325
Mole of HCl = 0.195 moleNext, we shall determine the total mole of HCl in the final solution. This can be obtained as follow:Mole of HCl in solution 1 = 0.1645 mole
Mole of HCl in solution 2 = 0.195 mole
Total mole = 0.1645 + 0.195
Total mole = 0.3595 moleNext, we shall determine the total volume of the final solution.Volume of solution 1 = 0.658 L
Volume of solution 2 = 0.325 L
Total Volume = 0.658 + 0.325
Total Volume = 0.983 LFinally, we shall determine the molarity of the resulting solution.Total mole = 0.3595 mole
Total Volume = 0.983 L
Molarity =?Molarity = mole / Volume
Molarity = 0.3595 / 0.983
Molarity = 0.366 MTherefore, the molarity of the resulting solution is 0.366 M
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Which of the following best describes the relationship between a
mutation and a resulting change in the coat color of a mouse?
Answers
Answer:
A I think
Explanation:
3. A baseball bat striking a baseball and sending it toward left field is an example
of energy transformation. True or false. Please help it’s due tomorrow!!!
Answers
Answer:
TRUE
Explanation:What is the value of c?
56.70
Answers
Due to the lack of information provided, the best I can give you is this:
In Chemistry, the letter c most commonly refers to specific heat, which is present in the ratio J/g°C.
Hope it helps :)
oncepts
4 List What are some of the physical properties
of stars?
Answers
Answer:
Brightness. Two characteristics define brightness: luminosity and magnitude. ...
Color. A star's color depends on its surface temperature. ...
Surface Temperature. ...
Size. ...
Mass.
Explanation:
there
what do you do if you add a bit too much solvent when filling the volumetric flask to the mark
Answers
If excess solvent is added, discard the entire solution and begin the process of preparing the solution afresh.
It is common to prepare solutions using a standard volumetric flask. In this method, the required amount of solid or liquid is added to the volumetric flask and made up to mark with solvent.
Sometimes, it is possible to mistakenly exceed the mark as the solvent is added. In such cases, you must discard the entire solution and begin the process of preparing the solution afresh.
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what is the hybridization at each carbon atom in the molecule?
Answers
The carbon atoms are sp3 hybridized.
Hope this helps!
is a single cell the smallest structure that carries out our activities nesscesary for life
Answers
yep, the cell is the smallest unit in a living organism that is capable of carrying out all of the activities of life.
The reaction is at dynamic equilibrium.
N2 + 3H2 ⇌ 2NH3
Which statement is correct?
(1 point)
The solution has the same concentrations of nitrogen gas and ammonia.
The solution has the same concentrations of nitrogen gas and ammonia.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
The solution has the same concentrations of nitrogen and hydrogen gases.
The solution has the same concentrations of nitrogen and hydrogen gases.
Both directions of the reaction have stopped.
Both directions of the reaction have stopped.
Answers
Considering the definition of dynamic equilibrium, the correct answer is second option: Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
Chemical equilibrium is a state of a reaction in which no changes are observed as time passes, even though the reaction continues. That is, the chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
So, dynamic equilibrium is a chemical equilibrium, which occurs when two reversible processes happen at the same speed in both directions. In this way, the concentrations of the reactants and products remain constant over time.
In summary, the correct answer is second option: Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
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https://brainly.com/question/25505273?referrer=searchResultsCan someone help me with this chemistry question please?
Answers
C. Energy use
please mark me a brainlist
What do the electron configurations of the elements Mo and Pt have in common?
Answers
Answer:
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.
Explanation:
AgNO3(aq) + NaCl (aq) —> AgCl (s) + NaNO3 (aq)
The equation represents a __ reaction.
A. synthesis
B. decomposition
C. neutralization
D. double replacement
Answers
Answer:
D
Explanation:
double replacement
the reactants decompose to form new substances by exchange of radicals
liquid bromine easily evaporates. explain what happens to the particles when a liquid evaporates
Answers
Answer:
they gain enough energy to break away from the bonds that keeps them a liquid
also the particles diffuse away
Explanation:
When liquid bromine evaporate,
Then space or distance between its particle increases.The bromine particles start moving freely when it evoporates .The inter-molecular force of attraction between particles is increases when liquid bromine evaporates.Why liquid bromine easily evaporates?The liquid bromine easily evaporates because of following reasons:
The liquid bromine is more denser then water.Its melting and boiling point is -7°C and 58.9°C.The liquid bromine present in the form liquid at room temperature that is why it is easy evaporates.To learn more about liquid bromine,
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what are colloids ?
Answers
A solution in which the size of solute particles is intermediate between those in true solution and suspension is called as Colloids.
Answer: A colloid is a mixture in which one substance consisting of microscopically dispersed insoluble particles is suspended throughout another substance.
Hope it helps , have a nice day :>
When a glucose molecule loses a hydrogen atom in an oxidation-reduction reaction, the glucose molecule is ________
Answers
Answer:
Important
Explanation:
Calculate the molar mass of carbon tetrachloride, CCl4.
Answers
A chemical reaction is when substance are changed into other substances.
True or False
Answers
Answer:
True
Explanation:
coz it is when one or more substances are mixed to produce one substance
Answer:
true
Explanation:
when its asking for a chemical reaction its asking for if it changed or had any effects like changing color or having weird effects on things it is mixed with or touches so its true
Write the balanced equation!!
Acid-Base Reactions: HA + BOH → BA + H2O
Sulfuric Acid, H2SO4 (aq) + potassium hydroxide (aq) potassium sulfate (aq) + water (l)
Answers
Answer:
H2SO4 + 2KOH + K2SO4 + 2H2O
Explanation:
there are 2 potassium atoms on the left side so gotta balance that and 2 for the H in the KOH so we have to add a 2 for the hydrogen in H2O..I hope this is useful..