Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Hope this Helps!~
If 164.8 g of iodine monobromide is combined with 62.4 g of ammonia, determine the amount of excess reactant that remains after the reaction is completed and the percentage yield of nitrogen triiodide if 96.4 is produced?
Answer:
[tex]m_{NH_3}^{leftover}=57.88g[/tex]
[tex]Y= 92.0\%[/tex]
Explanation:
Hello there!
In this case, according to the following chemical reaction between iodine monobromide and ammonia:
[tex]3IBr+NH_3\rightarrow NI_3+3HBr[/tex]
It turns out firstly necessary to identify the limiting reactant, by considering the proper molar masses and the 3:1 and 1:1 mole ratios of iodine monobromide to nitrogen triiodide and ammonia to nitrogen triiodide respectively:
[tex]n_{NI_3}^{by\ IBr}=164.8gIBr*\frac{1molIBr}{206.81gIBr}*\frac{1molNI_3}{3molIBr} =0.266molNI_3\\\\n_{NI_3}^{by\ NH_3}=62.4gNH_3*\frac{1molNH_3}{17.03gNH_3}*\frac{1molNI_3}{1molNH_3} =3.66molNI_3[/tex]
Thus, we conclude that the limiting reactant is IBr as is yields the fewest moles of nitrogen triiodide product. Next, we can calculate the reacted grams of ammonia as the excess reactant:
[tex]m_{NH_3}^{reacted}=0.266molNI_3*\frac{1molNH_3}{1molNI_3}*\frac{17.03gNH_3}{1molNH_3}=4.52gNH_3[/tex]
And therefore the leftover of ammonia is:
[tex]m_{NH_3}^{leftover}=62.4g-4.52g=57.88g[/tex]
Next, the percent yield is calculated by firstly calculating the theoretical yield of nitrogen triiodide as follows:
[tex]m_{NI_3}^{theoretical}=0.266molNI_3*\frac{394.72gNI_3}{1molNI_3} =104.8gNI_3[/tex]
And finally the percent yield by dividing the given actual yield of 96.4 g by the previously computed theoretical yield:
[tex]Y=\frac{96.4g}{104.8g}*100\%\\\\Y= 92.0\%[/tex]
Best regards!
How much water should be added to 5.00 g of KCl to prepare a 0.500 m
solution? *
Molality = moles of solute
Kg of solvent
100 g
38g
500 g
134 g
Other
Answer:133.4
c
m
3
Explanation: Explanation:
Molarity is number of moles of solute divided by number of litres of solution.
M
=
n
V
Rearrange for V to give
V
=
n
M
Number of moles of KCl is the mass divided by the molar mass of KCl which is 75.5 g/mol, so (5/75.5) = 0.0667 moles.
Now plug in the numbers:
V
=
n
m
=
0.0667
0.5
=
0.1334
litres
So you need to add 0.1334 litres of 133.4
c
m
3
of water.
(NB: symbol for molarity is upper case M. m is metres).
A student combines 20.0 grams of hydrogen and 20.0 grams of oxygen in a reaction. According to the law of conservation of mass, how many grams of water should be produced?
A)20.0grams B)40.0grams C)30.0grams D)10.0grams
Answer:
A)20.0grams
Explanation:
Answer:
10
Explanation:
A gas occupies 12.3 L at a temperature of 40.0 K. What is the volume when the temperature is increased to 60.0 K?
Answer:
the volume is 18.45 L
Explanation:
The computation of the volume when the temperature is increased to 60.0 K is shown below:
Since the gas occupied 12.3 L at a temperature of 40.0 k
And, the volume when the new temperature is 60.0 k
So, the volume is
= 60.0 k × 12.3 L ÷ 40.0 k
= 18.45 L
hence, the volume is 18.45 L
Ca(NO3)2 wht is the mass
Answer:
164.088 g/mol
Explanation: hope this helps
Answer:
Calcium nitrate
Explanation:
164.088 g/mol
give me the brainliest plss
How many liters of water vapor is produced when 33.4 moles of gaseous ammonia is reacted in the following reaction? Hint: Convert to moles first
Answer:
4 liters I think actually hold on
HELP PLEASE 40.0 grams of salt are dissolved in 100. grams of water. The solution is how many grams?
Answer:
The mass of the solution is 140 grams.
Explanation:
The mass of the solution is given by the sum of the solute's mass and the solvent's mass:
[tex] m_{sol} = m_{ste} + m_{svt} [/tex]
Where:
[tex] m_{sol} [/tex]: is the mass of the solution
[tex]m_{ste}[/tex]: is the mass of the solute
[tex]m_{svt} [/tex]: is the mass of the solvent
The solute is the salt (40.0 g) and the solvent is the water (100 g), so:
[tex] m_{sol} = m_{ste} + m_{svt} = 40 g + 100 g = 140 g [/tex]
Therefore, the mass of the solution is 140 grams.
I hope it helps you!
Gases in the atmosphere that trap heat energy are called
Answer:
Greenhouse Gases
Explanation:
What is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days?
Answer: A- 1 day
Explanation: I really hope that helped. BYE!!
1 day is the half-life of a radioisotope if a 20 g sample becomes 5 g after 2 days
Which element has 1 valence electron in its outer shell and will react with a
group 17 element in a li ratio?
A. Chlorine
B. Calcium
C. Boron
D, Sodium
Answer:
[tex]\boxed {\boxed {\sf D. \ Sodium}}[/tex]
Explanation:
Valence electrons are electrons in the outermost shell.
One way to find valence electrons is with the electron configuration. This is often found on the Periodic Table. The last number in this configuration is the number of valence electrons, because an electron configuration shows where electrons are located and the last number represents the outer shell.
Chlorine: 2-8-7 (7 valence electrons)Calcium: 2-8-8-2 (2 valence electrons)Boron: 2-3 (3 valence electrons)Sodium: 2-8-1 (1 valence electron)In addition, all group 1 or alkali metals have 1 valence electrons. These include lithium, sodium, potassium, rubidium, cesium, and francium.
Even though we already know it is sodium based on valence electrons, here is an explanation of the reaction ratio.
Since sodium has 1 valence electron, it wants to get rid of it to satisfy the Octet Rule (8 valence electrons). Group 17 elements have 7 valence electrons, so they need 1. The two elements will react in a 1 to 1 ratio because the sodium donates its 1 excess electron to the group 17 element that needs 1.
The element that has 1 valence electron in its outer shell and will react with a group 17 element in a 1:1 ratio is sodium. Therefore, the correct option is option D.
The electrons in an atom's highest energy level, commonly referred to as the valence shell, are called valence electrons. These electrons interact with other atoms and participate in chemical bonds. Alkali metal sodium (Na), which belongs to group 1 of the periodic table, contains one valence electron in its outermost shell. Halogens, or group 17 elements, have 7 valence electrons.
Chlorine (Cl) is a member of group 17 and combines with sodium to generate sodium chloride (NaCl), an ionic compound. One sodium atom contributes its one valence electron to a chlorine atom, creating a stable ionic connection.
Therefore, the correct option is option D.
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Como se explica o fato de o diamante e o grafite serem formados pelo mesmo elemento, o carbono, e serem materiais completamente diferentes?
Answer:
Ver explicacion
Explanation:
La capacidad de un elemento de existir en diferentes formas en el mismo estado físico se conoce como alotropía.
No es solo el carbono el que exhibe alotropía. También se sabe que el azufre y el fósforo exhiben alotropía.
Hay dos alótropos cristalinos de azufre; grafito y diamante. El grafito y el diamante difieren en la disposición de los átomos de carbono y la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
Por lo tanto, el grafito y el diamante tienen propiedades físicas y químicas observadas completamente diferentes debido a las diferencias en la disposición de los átomos de carbono en cada sustancia, así como a las diferencias en la naturaleza de los enlaces entre los átomos de carbono en ambas sustancias.
Speed is the rate of change of position expressed as _____ traveled per unit of time. A. direction B. meter C. displacement D. distance
Answer. Speed is the rate of change of position expressed as distance travelled per unit of time
give brainliest if right
Answer:
distance
Explanation:
A scientist wants to test the effectiveness of a medicine in treating
headaches. He puts the medicine into cookies and then tells his subjects to
lie down and have a cookie when they have a headache. He asks them to give
him feedback about how well these relaxation techniques work to cure their
headaches. What rule of ethics does this experiment break?
O A. The subjects are not informed that they are taking a medicine.
B. It is likely to harm his subjects.
C. The scientist is taking the work of others by reviewing the
subjects' feedback.
D. It is testing more than one variable at the same time.
Is this an example of physical or chemical weathering?
chemical
physical
Answer:
Physical
Explanation:
because the erosion of the canyon did not change any of the chemical attributes of the rock it only changed the appearance. it may have changed the color which is an example of chemical properties but in this case, it is physical. But in other cases, you would refer to this type of weathering as mechanical weathering.
Answer:
it physical
Explanation:
because it moving
water will boil when...
Answer:
C
Explanation:
An ambulance took 2 hours to cover a distance of 10 kilometers. Find its speed.
Answer:
5km/hour
Explanation:
2hours = 10km
/2 /2
1 hour = 5km
An ambulance took 2 hours to cover a distance of 10 kilometers. Find its speed.
Answer:-Given:-Distance = 10 kilometers.
Time = 2 hours.
To Find:-Its speed.
Solution:-We know,
[tex] { \boxed{\bf{\rm \red {Speed \: = \: Distance \: × \: Time}}}} [/tex]
Speed = 10 kilometers × 2 hours
Speed = 20 km/hr
Its speed is 20 km/hr. [Answer]why would a farmer add calcium hydroxide to his soil
Please answer all of the examples below!
Answer:
The first one is balanced. The second one is not.
Explanation:
The first one is balanced because there are the same amount of elements on the reactant side as there are on the product side. The second one is not balanced because there are not the same amount of elements on the reactant side as there are on the product side. Therefore, it is not balanced
More Detailed: first example
Reactant side (left of arrow)
H: 2
C: 1
O: 3
Product side (right of arrow)
H: 2
C: 1
O: 3
More detailed: second example
Reactant side:
Na: 1
O: 1
H: 1
C: 1
Product side:
Na: 2
O: 4
H: 2
C: 1
the variables needed to balance this equation is 2,1, 1, 1.
how do you answer #5?
Answer:
Percentage Yield is calculated by doing -> experimental/theoretical x 100% = percentage yield.
I THINK that if your questions are connected it should be 14/16.89 x 100% = 82.889%
Explanation:
Which choices are uses of electrical energy?
Choose all that apply.
A. creates useful gases
B. supplies energy for heat
C. provides power to lights
D. creates a magnetic force
Answer:
option A,B and C.
are the options I chose.
The electrical devices include those that are needed to power appliances and those that are used in daily life. In order to make things operational, they need power or energy.
Electrical energy is taken from the movement of electronically charged particles. These when collide produce energy that can be used for heating, lighting, etc.Hence the option C is correct.
Learn more about the choices are uses of electrical energy.
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HELP ME PLEASE WILL GIVE BRAINLY NO BAD ANSWERS
Answer:
7.17
Explanation:
convert 5.50g to moles of salicylic acid. Then use mole ratios and convert the moles of salicylic acid to moles of Asprin(mole ratio is 1:1). Then convert the moles to grams using the molar mass of asprin.
What are the 4 main layers of the Earth's Atmosphere?
Answer:
troposphere, stratosphere, mesosphere, thermosphere and exosphere
Explanation:
Gas is confined in a metal tank in the figure. At 20.20°C, the gas exerts a pressure of 8.532 atm.
After heating the tank, the pressure of the gas increases to 10.406 atm. What is the temperature of
the heated gas?
Answer:
The temperature of the heated gas is 357.6 K (or 84.6 C)
Explanation:
Gay Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.
In short, when there is a constant volume, as the temperature increases, the pressure of the gas increases. And when the temperature is decreased, the pressure of the gas decreases.
So, this law indicates that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T} =k[/tex]
You want to study two different states, an initial state 1 and a final state 2. Then it is true:
[tex]\frac{P1}{T1} =\frac{P2}{T2}[/tex]
In this case:
P1= 8.532 atmT1= 20.20 C= 293.2 K (being 0 C= 273 K)P2= 10.406 atmT2= ?Replacing:
[tex]\frac{8.532 atm}{293.2 K} =\frac{10.406 atm}{T2}[/tex]
Solving:
[tex]T2*\frac{8.532 atm}{293.2 K} =10.406 atm[/tex]
[tex]T2=10.406 atm*\frac{293.2 K}{8.532 atm}[/tex]
T2= 357.6 K
The temperature of the heated gas is 357.6 K (or 84.6 C)
The new temperature of the heated gas when the pressure increase to 10.406 atm is 84.60 °C
Data obtained from the question Initial temperature (T₁) = 20.20°C = 20.20 + 273 = 293.20 KInitial pressure (P₁) = 8.532 atm Volume = constant New pressure (P₂) = 10.406 atmNew temperature (T₂) =? How to determine the new temperatureThe new temperature of the gas can be obtained by using the combined gas equation as illustrated below:
P₁V₁ / T₁ = P₂V₂ / T₂
Since the volume is constant, we have:
P₁ / T₁ = P₂ / T₂
8.532 / 293.20 = 10.406 / T₂
Cross multiply
8.532 × T₂ = 293.20 × 10.406
Divide both side by 8.532
T₂ = (293.20 × 10.406) / 8.532
T₂ = 357.6 K
Subtract 273 from 357.6 K to express in degree celsius
T₂ = 357.6 – 273
T₂ = 84.60 °C
Learn more about gas laws:
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Suppose Earth was tilted much less on its axis. What effect would this have on the planet? Please help me !
Answer:
If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.
Explanation:
If a planet tilts more, it leads to colder winters and warmer summers. However, if a planet tilts less, it leads to less severe seasons that is and milder winters and cooler summers.
If Earth was tilted much less on its axis, it would lead to minor changes in precipitation and temperatures as Earth moves slightly towards and away from the sun.
If a response is towards a stimulus it's described as _______; if a response is away from the stimulus it's described as _____.
Answer: Positive tropism, negative tropism
Explanation:
Stimulus can be define as external and internal agent which generate a response in an organism. If the growth and action is towards the stimulus it is called as positive tropism. If the growth and action is away from the stimulus it is called as negative tropism. Example, the growth of the stem towards the sunlight is called positive tropism whereas the growth of the root away from the sunlight is called negative tropism. Here, sunlight is the stimulus.
How many grams of aluminum to complete the reactions below?
Extra Content
6HCl(aq) + 2Al(s) → 2AlCl3(s) + 3H2(g)
six moles of hydrochloric acid reacts with two moles of aluminum to produce 2 moles of aluminum chloride plus 3 moles of hydrogen gas.
A.
26.9 grams
B.
55 grams
C.
53.96 grams
D.
2 grams
The answer is option C
Explanation:
Al= 26.982
2 moles of aluminium wad given so
2× 26.982= 53.96 grams
What mass of ethanol can you boil with 9986 J if the heat of vaporization is 854 J/g?
Answer:
51,069.2 J
Explanation:
Use the heat of vaporization formula:
q=m⋅Hv
The heat of vaporization of ethanol is 854 J/g (given in the question), which means that it takes 854 joules of energy to vaporize one gram of ethanol.
Since we have 59.8 grams of ethanol, plug 59.8 into the formula and multiply by 854.
q = (59.8) (854)
q= 51069.2 J
hope this helped somehow
17) What is the molarity
of a solution with
55 grams of CaCl2
dissolved in .78 L
of water?
a. 64M
b. 1.3 M
c. 171 M
d. 91 M
The molarity of a solution with 55 grams of CaCl2 dissolved in 0.78 L is 0.64M. Details about molarity is found below.
How to calculate molarity?The molarity of a solution can be calculated by dividing the number of moles of the substance by its volume.
However, the number of moles of a substance must first be calculated using the following expression:
no of moles = 55g ÷ 111g/mol
no of moles = 0.49mol
Molarity of CaCl2 solution = 0.49mol ÷ 0.78L
Molarity of CaCl2 solution = 0.64M
Therefore, the molarity of a solution with 55 grams of CaCl2 dissolved in 0.78 L is 0.64M.
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What are the products of the following neutralization reaction? (No need to balance)
H3PO4 + Ba(OH)2 --> ??? + ???
A.)H2O + Ba3(PO4)2
B.)H30+ + BaPO4
C.)H30+ + Ba3(PO4)2
D.)H2O + BaPO4
H3PO4 + Ba(OH)2 --> Ba3(PO4)2 + H2O
so, (A) H2O + Ba3(PO4)2 is your answer.
PLEASE HELP DUE IN 20 MINUTES Find the empirical formula for the following problem. Remember to show your work if you want
to earn credit.
1. One mole of an unknown compound has 36.0 g of carbon and 6.0 g of hydrogen. What
is the empirical formula of the unknown compound? (Hint: You will want to reduce to find
the empirical formula)
Given: Carbon: 36.0 grams
1 mol C = 12.0 g
Hydrogen: 6.0 g
1 mol H = 1.0 g
Unknown: empirical formula
Solve:
Answer:
CH2
Explanation:
The empirical formula is the simplest formula of a chemical compound. It shows the ratio in which constituent atoms are combined in the compound.
To obtain the empirical formula, we divide the given mass of each element by the relative atomic mass of that element.
C- 36.0 g/12.0 g H- 6.0g/1.0g
C- 3 H-6
Divide through by the lowest ratio;
C-3/3 H- 6/3
C-1 H-2
Hence the empirical formula of the compound is
CH2