Answer:
A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).
B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.
C.) 1.88 M
Explanation:
To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.
Volume = 100 mL / 1,000 = 0.100 L
Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol
Molar Mass (NaCl) = 58.44 g/mol
11.0 g NaCl 1 mole
----------------- x --------------- = 0.188 moles NaCl
58.44 g
Molarity = moles / volume
Molarity = 0.188 moles / 0.100 L
Molarity = 1.88 M
Magnesium combines with oxygen to form magnesium oxide. If 10.57 g of
magnesium reacts completely with 6.96 g of oxygen, what is the percent by mass of
oxygen and magnesium?
The total mass is 10.57+6.96=17.53 g.
So, the percent by mass of magnesium is (10.57)/(17.53) * 100 = 60.3%
The percent by mass of oxygen is (6.96)/(17.53) * 100 = 39.7%
approximately how often does the moon revolve around the earth?
o every 365 days
every 30 days
daily
o every season
Answer: A
Explanation: NO CAP..................... A!!!!!!!!!!!!!!
How much 3m stock solution would it take to make 70 ml of 1.2 m solution?
Answer:
Yes it is right........
What differences do you notice when you heat up the brick and the iron at same temperature?
After heating the brick and the iron, it is observed that the brick heats up quicker and the brick releases energy quicker.
What is thermal energy?Thermal energy (also called heat energy) is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.
The iron has more energy than the brick even though it is at the same temperature. That means that the iron must have more particles than the brick.
Iron and brick are both solids and have the same volume, so the difference in total energy must be due to atomic composition.
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which radioactive waste can be stored for decay and then safely released into the environment?
N-16
Sr-90
Cs-137
Pu-239
The radioactive waste can be stored for decay and then safely released into the environment is N-16.
What are the types of decay?Decays can be of three types: alpha, beta and gamma. Each of them corresponds to a different radioactive particle, which changes the nucleus of the emitting atom according to its characteristics.
Nitrogen 16 ( 16 N ) is the unstable isotope of nitrogen whose nucleus consists of 7 protons and 9 neutrons. Its period is 7.13 s.
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What does it mean for a strong base to be in equilibrium?
o the position of equilibrium lies far to the right, with products being favored.
o the position of equilibrium lies far to the left, with products being favored.
there is a great deal of base and very few ions.
o there is an equal amount of reactants and products.
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The position of equilibrium lies far to the right, with products being favoured. Hence, option A is correct.
What is equilibrium?Chemical equilibrium is a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.
A very high value of K indicates that at equilibrium most of the reactants are converted into products.
The equilibrium constant K is the ratio of the concentrations of products to the concentrations of reactants raised to appropriate stoichiometric coefficients.
When the value of the equilibrium constant is very high, the concentration of products is much higher than the concentration of reactants.
This means that most of the reactants are converted into products and the position of equilibrium lies far to the right, with products being favoured.
Hence, option A is correct.
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Find the value of c with the correct number of significant
figures from the equation a-b-c = 401, if a = 1387.11 and b =
928.321.
Answer:
19-73 70-65-46 78-59-86 84-64
The value of c from the given equation is equal to 58.
What are significant figures?Significant figures can be used to create numbers and these numbers can be written in the form of digits. We can determine the number of significant figures by counting the values from the first non-zero figure placed on the left.
In the case of multiplication or division, the number of significant figures must be the same as the value with the minimum significant figures. The significant digits of a given number can be defined as those significant figures, which deliver the meaning relative to its accuracy.
The answer is rounded off in such a manner so it will have the digits after the decimal as the least precise number have the same number of digits after the decimal.
Given the equation can be written as:
a - b - c = 401.0
The value of a = 1387.11
The value of b = 928.321
By substituting the values of 'a' and 'b' in the given equation we can evaluate the value of 'c':
1387.11 - 928.321 - c = 401.0
c = 458.79 - 401.0
c = 57.79
c = 58
Therefore, the value of c is equal to 58.
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Part H
The concept of entropy might best be illustrated by:
A. The birth of a baby.
B. A construction crew building a skyscraper.
C. An old building on the verge of collapsing.
D. The organization of a rock band.
Review
1. Energy is measured in metric units called ______________
2. An example of electromagnetic energy would be:
a. A windmill.
b. A nuclear isotope like uranium.
c. An X-ray.
d. Coal.
3. The formula (mv2/2) provides a way to calculate the ______________ energy of an object.
4. To calculate the gravitational potential energy of a statue on a 10-meters-tall platform, you would have to know the statue's ______________
5. When a match is struck, the chemical energy stored in the match's head is converted to _____________ and _____________ energy.
6. Heat can be transferred through ______________. ______________, or _________?
7. The Law of Conservation of Energy states that ____________________________ _
8. "You can't get more energy out of something than you put into it" is a statement of?
9. T or F? Living things show that the concept of entropy is not true.
10. Explain why mines dug deep within the earth are often quite hot.
11. What kind of energy does not do work?
12. Sir Marvin decided to improve the destructive power of his cannon by increasing the size of his cannonballs. Sir Seymour kept his cannonballs the same size, but improved his powder to provide more velocity.
a) Which knight will have the more destructive cannon? Why?
b) Jupiter is a more massive planet than either Saturn or Earth. Saturn is more massive than Earth. On which planet would an astronaut weigh the most?
13. T or F? Radiant energy is generated by a petunia on Tuesday.
14. In terms of the laws of thermodynamics, explain why a refrigerator vents hot air.
Answer:
See explanation.
Explanation:
-_-
Part H: C
Review:
1. joules
2. c
3. kinetic energy
4. mass
5. heat and light
6. conduction, convection, or radiation
7. the amount of energy in the universe is constant / energy can neither be created nor destroyed
8. Law of Conservation of Energy / Impossibility of Perpetual Motion
9. F
10. The earth's core.
11. Potential energy.
12. Nice to know.
a) Sir Seymour. The kinetic energy equation has velocity squared. Increasing velocity is much more destructive..
b) Jupiter. Weight is gravity acting on mass. Gravity increases with mass. So Jupiter.
13. True.
14. Second Law of Thermodynamics describes heat flow from hot to cold objects. So, for the refrigerator to work, it needs to steadily expell hot air or objects inside won't cool as they releases heat to the surrounding air inside the refrigerator.
2. Qualitative observations are ______. based on your senses measurable often taken using instruments only made by scientists in a laboratory
Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory
What are Qualitative Observations ?The research method in which the data is collected either by using the five senses or by measurements, In this the qualities of the substance matter and not the quantity.
The qualitative observation is subjective and so varies from person to person.
Each research using the qualitative observation will be unique.
The data is collected using one to one interaction , by questionnaires , The data is non-numerical.
Qualitative observations are research methods based on your senses measurable often taken using instruments only made by scientists in a laboratory
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covers 70 precent of earths surface
Answer:
Water covers 70 percent of earth's surface.Name each of the following compounds
a. MnS2
b. HClO4 (aq)
c. NH4C2H3O2
d. Li3N
e. Na2O2
Answer:
a. Manganese (IV) sulfide
b. Perchloric acid
c. Ammonium acetate
d. Lithium nitride
e. Sodium peroxide
Explanation:
hope this helps!! p.s. i really need brainliest :)
List the five main components of a nuclear reactor facility and explain why each part is important . Use details to support your answer
The five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, control rods, and a shield/containment system.
What is a nuclear reactor?Nuclear reactors are the main parts of the nuclear power plant. They run the nuclear power by initiating the nuclear reactions which produce heat.
Thus, the five components that are important are nuclear fuel consisting of fissionable material, reactor coolant, a nuclear moderator, a shield/containment system, and control rods.
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What is the importance of a special habitat?
state 2 gases used for combustion
How do scientists answer questions?
OA. By making observations and performing experiments
OB. By listening to the ideas of others and choosing the best one
OC. By writing papers that support their opinions
OD. By reading reliable sources on the subject they are interested in
What kind of reaction is this ?
Hi! I am struggling with this problem and if anybody can correctly answer this problem I would gladly appreciate it, thanks!
....................
Answer:
43.2 x 10⁻¹¹
Explanation:
The rate law equation for the reaction is:
Rate = k[CH₃CHO]²
In the table, you are given some of the concentrations and rates. What you are not given is the value of "k". Since you are only given the concentration in Trial 3, you need to know the value of "k" in order to find the rate. To find this value, plug the information from one of the trials into the equation and simplify to find "k".
Rate = k[CH₃CHO]²
2.70 x 10⁻¹¹ = k[2.00 x 10⁻³]²
2.70 x 10⁻¹¹ = k[4.00 x 10⁻³]
6.75 x 10⁻⁶ = k
Now that you know the value of "k", you can use it and the concentration from Trial 3 to find the rate.
Rate = k[CH₃CHO]²
Rate = (6.75 x 10⁻⁶)[8.00 x 10⁻³]²
Rate = (6.75 x 10⁻⁶)[6.4 x 10⁻⁵]
Rate = 4.32 x 10⁻¹⁰ -------> 43.2 x 10⁻¹¹
How many NH3 molecules are produced by the reaction of
4.0 mol of Ca(OH)2 according to the following equation:
(NH4)2SO4 + Ca(OH)2 → 2 NH3 + CaSO4 + 2 H₂O
Answer:
1 mol Ca(OH)2 produces 2 mol NH3
4 mol Ca(OH)2 will produce 8 mol NH3
1 mol NH3 contains 6.022*10^23 molecules NH3
8 mol NH3 contain 8*6.022*10^23 = 4.8*10^24 molecules NH3
Explanation:
what mass in grams of hydrogen is produced by the reaction of 4.73 g of magnesium with 1.83 of water
The mass, in grams, of hydrogen that would be produced from the reaction will be 0.102 grams
Stoichiometric calculationsFrom the balanced equation of the reaction:
[tex]Mg + 2H_2O -- > Mg(OH)_2 + H_2[/tex]
The mole ration of magnesium to water is 1:2.
Mole of 4.73 grams Mg = 4.73/24.3 = 0.195 moles
Mole of 1.83 grams water = 1.83/18 = 0.102 moles
Hence, water is limiting.
Mole ratio of water to the hydrogen produced = 2:1
Equivalent mole of hydrogen gas produced = 0.102/2 = 0.05 moles
Mass of 0.05 moles hydrogen gas = 0.05 x 2 = 0.102 grams
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Identify which substitution product is expected to be favored. Explain. The inverted product is expected to predominate slightly, due to SN2 competition. The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
What is substitution product?Substitution product is a product that is gotten from a reaction in which a group of reactant is replaced by another group in the reaction.
Therefore,The substitution product that is suppose to be favoured is The product with retention of configuration is expected to predominate slightly, because the leaving group blocks the nucleophile.
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Perform the following operation and express the answer in scientific notation 8.6500x10^3+6.5500x10^5
Taking into account the scientific notation, the result of the sum is 6.6365×10⁵.
Scientific notationFirst, remember that scientific notation is a quick way to represent a number using powers of base ten.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Sum in scientific notationYou want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.
In this case, the highest exponent is 5.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 8.6500×10³= 0.086500×10⁵
Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:
0.086500×10⁵ + 6.5500×10⁵= (0.086500+ 6.5500)×10⁵= 6.6365×10⁵
Finally, the result of the sum is 6.6365×10⁵.
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How many liters is 3.3 moles of a gas? Please show work.
At STP 1 mole of gas occupies a volume of 22.4 liters. So 3.3moles of gas at STP7 will theoretically occupy 22.4*3.3-74 liters
Using a spatula and a balance, measure 2.50 g copper(II) chloride (CuCl₂). You may need to add
and subtract to get exactly 2.50 g.
someone help i don’t get this
The mass of the solid is measured using a balance on and a filter paper.
How do you measure a solid?Measurement is very important in the chemistry laboratory. It is often important to measure the mass of a solid which could be used to prepare a solution.
In such cases, a filter paper is placed on the balance and the mass of the paper is measured. The solid is now placed on the paper until the value reads the sum of the masses of the paper and the solid to be measured.
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describe one way the respiratory and nervous system work together
The respiratory system supplies oxygen to the blood and removes carbon dioxide. The brain monitors respiratory volume and blood gas levels. The brain regulates respiratory rate.
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One way the respiratory and nervous systems work together is through the control of breathing rate and depth based on the body's oxygen and carbon dioxide levels.
Chemoreceptor Response to Gas Levels:
Specialized sensors called chemoreceptors are located in the blood vessels, particularly in the aorta and carotid arteries, which detect changes in the levels of oxygen and carbon dioxide in the bloodstream. These chemoreceptors are part of the nervous system and play a crucial role in regulating breathing.
When the oxygen level in the blood decreases or the carbon dioxide level increases (indicating a need for more oxygen or removal of excess carbon dioxide), the chemoreceptors send signals to the brainstem, specifically to the medulla oblongata and pons. These regions of the brain are responsible for controlling involuntary processes like breathing.
The nervous system, upon receiving these signals, responds by adjusting the rate and depth of breathing to ensure that the body's oxygen and carbon dioxide levels remain within a healthy range.
For example, if the oxygen level drops due to increased physical activity, the nervous system stimulates an increase in breathing rate to bring in more oxygen. Similarly, if carbon dioxide levels rise (as during intense exercise), the nervous system triggers deeper and faster breathing to expel excess carbon dioxide.
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Which type of reaction does this diagram represent?
Answer:
Nuclear fission
Explanation:
Because the little particles are being spread out and the two elements are broken apart
Two chemicals react in an endothermic reaction. what can be known about this reaction? the new substance will need more energy to form its chemical bonds than the old substance will release. more energy will be released from the old substance than the new substance will need to form its chemical bonds. a precipitate will form as a result of the reaction. a gas will form as a result of the reaction.
The new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
What is an endothermic reaction?Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
Endothermic reactions, in general, are those that absorb (or use) energy. In endothermic reactions, more energy is absorbed when bonds in the reactants are broken than is released when new bonds are formed in the products.
Normally, when a chemical bond is broken, energy is released in the process. The chemical bond formation also demands an energy input.
The energy that is supplied/released can come in varieties (such as heat, light, and electricity). The formation of chemical bonds following the absorption of heat from the environment characterizes endothermic processes.
When two chemicals react in an endothermic reaction the new substance will need more energy to form its chemical bonds than the old substance will release. Hence, option A is correct.
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A sample of gas with a volume of 30.0 ml at 25.0c is heated to 50.0c what is the new volume of the gas
Answer:
The new volume is 60ml
Explanation
using the equation p1v1/n1t1=p2v2/n2t2 we would divied 30 by 25 the multiply by 50 to get 60
Ammonium hydrogen sulfide (NH4HS) can
decompose to ammonia and hydrogen sulfide:
NH₂HS(S)NH₂(g) + H₂S(g)
What is the equilibrium constant expression for
this system?
[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex] is the equilibrium constant expression for
NH₂HS(S) → NH₂(g) + H₂S(g). Hence, option A is correct.
Definition of equilibrium constant.A number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
Equilibrium constant for the NH₂HS(S) → NH₂(g) + H₂S(g) will be:
[tex]K_c = \frac{[Product]^{coefficient}}{[Reactantt]^{coefficient}}[/tex]
[tex]K_c = \frac{[NH_2]^{1}[H_2S]^{1}}{[NH_2HS]^{1}}[/tex]
Hence, option A is correct.
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Could someone help me with this please
Answer:Your can use the internet There is a web site that is called periodic table.com it is very use full
Explanation:Have fun
if energy can neither be created nor destroyed, into what kinds of energy have these resources been transformed?
Answer:
Heat, Sound
Explanation:
I am pretty sure you are addressing mechanical energy and machine efficiency. So you are probably aware a machine can't achieve 100% efficiency because of the first and second laws of thermodynamics. This energy is lost to friction and air resistance. They convert some gravitational potential energy to heat and sound energy rather than all to kinetic energy, and vice versa.