Answer:
1 Gram of sodium azide produces 2.25 grams of nitrogen, so you would need about 13.7777777778 grams of sodium azide to produce 31 grams of nitrogen
Explanation:
A solution is made by dissolving 38.750 g of sample of an unknown, non-electrolyte compound in water. The mass of the solution is exactly 500.0 g. The boiling point of this solution is 100.220 °C.
What is the molecular weight of the unknown compound?
The molecular weight of the unknown compound will come as 0.42 g/mol. It can be calculated as follows:
Given,
mass of sample (solute) (wb) = 38.750g
mass of solution = 500 = mass solute + mass solvent
Here solute (b) unknown non electrolyte compound
solvent (a) is water
Molecular mass of unknown compound (mb)
= mol solute/Kg solvent (nb /wa)
Boiling point=
ΔT = K×mb
= 100.220°C×
≅ 373.22 K
Since
K water = 1.86 K.Kg/mol
Mb = ? (Mol wt ) (wb/nb)
Mb = ΔT / K
Mb = (373.22 K) / (1.86 K.Kg/mol)
Mb = 200.656 mol/Kg
Mass solvent = 500.0 g - 38.750 g
= 461.25 g
= 0.461 Kg
No of moles of solute=
nb = (200.656 mol/ Kg)×(0.461 Kg)
= 92.2 mol solute
Molecular weight
Mb = (38.750 g)/(92.2mol)
= 0.42 g/ mol
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how many moles of co2 is produced by the complete combustion of 86.2
grams of Sucrose in the presence of excess oxygen
The number of moles of CO₂ produced by the complete combustion of 86.2 g of sucrose, C₁₂H₂₂O₁₁ is 3.024 moles
We'll begin by obtaining the mole of 86.2 g of sucrose, C₁₂H₂₂O₁₁. This can be obtained as follow
Mass of C₁₂H₂₂O₁₁ = 86.2 gMolar mass of C₁₂H₂₂O₁₁ = 342 g/molMole of C₁₂H₂₂O₁₁ =?Mole = mass / molar mass
Mole of C₁₂H₂₂O₁₁ = 86.2 / 342
Mole of C₁₂H₂₂O₁₁ = 0.252 mole
How to determine the mole of CO₂ producedC₁₂H₂₂O₁₁ + 12O₂ -> 12CO₂ + 11H₂O
From the balanced equation above,
1 mole of C₁₂H₂₂O₁₁ reacted to produce 12 moles of CO₂.
Therefore,
0.252 mole of C₁₂H₂₂O₁₁ will react to produce = 0.252 × 12 = 3.024 moles of CO₂.
Thus, 3.024 moles of CO₂ were produced from the reaction
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Given the densities of the liquids and solids, label the picture of the test tube with the appropriate position of each substance. Assume the liquids do not mix.
The arrangement of the objects according to density is;
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
What is density?The term density is used to describe the value that is obtained as the ratio between the mass and the volume of an object. When we have a mixture of objects, the objects would be separated based on the ones that are denser. We know that the denser liquids would always be found towards the bottom of the vessel that contains the mixture of substances.
Similarly, the solids that are more dense would always tend to sink inside the mixture while the ones that are less dense are closer to the surface.
Now let us arrange the substances according to the densities of each.
Solids;
Cork
Ice
Silver ring
Gold ring
Liquids
Gasoline
Seawater
Mercury
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What is the tendency of a solute to change the melting point of a solid called?
A. Freezing point depression
B. Evaporation point change
C. Phase change depression
D. Boiling point elevation
Answer: Boiling point elevation
Explanation:
Boiling Point Elevation is the property of a solute that allows it to modify the boiling point of a solid. The boiling point of a solution that contains a non-volatile solute becomes greater than the boiling point of the pure solvent (without any solute). As the solute concentration increases in a solution, there is an increment in the boiling point as well hence called the boiling point elevation.
Answer: A. Freezing point depression
Explanation:
1200cm per hour_______= feet per minute
Dimensional analysis
Answer: 0.656168 Feet per minute
Explanation:
0.656168 feet per minute
Explanation:The formula is:
for an approximate result, divide the speed value by 1829
Which element has the largest ionization energy
Answer:
Explanation:
The answer is Xe.
The equilibrium constant is given for one of the reactions below. Determine the value of the missing equilibrium constant.
The value of equilibrium constant of the second reaction will come as 2.6× 10⁵. It can be calculated from the value of previous equilibrium constant.
Firstly these reactions will be written with reversible arrows, because they are at equilibrium :
H₂(g) + Br₂(g) ⇔ 2 HBr(g)
k₁= 3.8 × 10⁴
2HBr(g)⇔ H₂ (g)+ Br₂ (g)
k₂=?
If we compare the given two reactions , we will find out that second equation is simply reversible reaction of first one .
We know that if we reverse an equilibrium equation, the new equilibrium constant become the reciprocal of the original equilibrium constant.
So, the equilibrium constant of first reaction is K₁= 3.8× 10⁴
Equilibrium constant for second reaction=
k₂= 1/k₁
= 1/ 3.8× 10⁴
=2.6× 10⁻⁵
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Your question is incomplete, for complete question, kindly refer:
The equilibrium constant is given here for one of the reactions below. Determine the value of the missing equilibrium constant in the second reaction.
H₂(g) + Br₂(g) ⇒ 2 HBr(g) k₁= 3.8 × 10⁴
2HBr(g)⇒ H₂ (g)+ Br₂ (g) k₂=?
Thinking about valence electrons, which groups would go best together? Name 2 sets
Valence electrons are the electrons present in the outermost shell s and p, or outermost energy level, of an atom.
valence electrons in each group are:-
Groups 3-12 (transition metals)= 2* (Here 4s shell is complete and it cannot hold any more electrons).
Valence electrons determine the electrical conductivity of an element. Depending on the nature of elements it can be metal, non-metal, or metalloid.
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HELP Can someone do this?
The first law appears to be at conflict with what we typically encounter. According to Newton's first law, any object at rest that is not affected by external forces will stay at rest, and any object in motion that is not affected by external forces will continue moving in a straight path at a constant speed.
The first law of motion in physics states that unless an external force acts upon a body, it will continue to move at its current uniform speed and remain at rest. A ball will exert force on the ground or a wall when it strikes them, respectively. The ground or a wall exerts a reaction force, which causes the ball to bounce back.
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I NEED THIS ASAP!! It's not hard science btw. How can polluted stream waters enter groundwater sources? Be sure to use key terms from the lesson in your explanation. HINT: keywords= infiltration, irrigation, point sources, non point sources, etc. (you do NOT need to use all of these! )
Answer:
Poorly Constructed Irrigation Wells
These wells can allow contaminants to enter ground water. Often pesticides and fertilizers are applied in the immediate vicinity of wells on agricultural land.
Some wells rely on artificial recharge to increase the amount of water
infiltrating an aquifer, often using water from storm runoff, irrigation, industrial processes, or treated sewage. In several cases, this practice has resulted in increased concentrations of nitrates, metals, microbes, or synthetic chemicals in the water.
Explanation:
What is the molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L?
The molarity of a solution containing 4.2 mol of NaCl and a volume of 2.3 L is 1.9 M
The molarity is the number of moles of solute per litre of solution.
n=4.2
V=2.3 L
M=n/V
M=4.2/2.3
[tex]M=1.82[/tex]
Molarity is ≅1.9 M
Molarity or molar concentration is the number of moles of solute per liter of solution.Molar concentration can be used to convert between the mass or moles of solute and the volume of the solution.Molarity is represented by M, which is termed as molar. One molar is the molarity of a solution where one gram of solute is dissolved in a liter of solution. Since the solvent and solute combine to create a solution in a solution, the total volume of the solution is measured.To learn more about molarity visit:
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Water hardness is the measure of the concentrations of __________ and __________ dissolved in the water sample.
Answer:
Calcium and Magnesium
Explanation:
Dissolved calcium (Ca++) and magnesium (Mg++) are the only two divalent cations found at appreciable levels in most waters.
A glass dropper delivers liquid so that 25 drops equal 1.00 mL. How many milliliters are in 37 drops?
Calculate the number of atoms of silver in 3.53g of silver.
Which part(s) of the molecule can form a hydrophobic interaction with a suitable partner? Check all that appluy:
In the given diagram four number means C=O
Hydrophobic interactions describe the relations between water and hydrophobes and hydrophobes are nonpolar molecules and usually have a long chain of carbons that do not interact with water molecules and the mixing of fat and water is a good example of this particular interaction the tendency of nonpolar groups or molecules to aggregate in water solution in that given image amino acid are given and in that amino acid the NH₃⁺ are in four number and water are didn't attached to NH₃⁺ ion and attached to C=O
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Sodium is a reactive, alkali metal. A neutral sodium atom consists of 11 protons, 11 electrons and 12 neutrons. It is a soft metal and metallic silver in color. Sodium plays an important role in the functioning of the human nervous system.
Which of the following images represents the atomic structure of a neutral sodium atom?
W.
X.
Y.
Z.
A.
W
B.
X
C.
Z
D.
Y
Sodium is a reactive, alkali metal. A neutral sodium atom consists of 11 protons, 11 electrons, and 12 neutrons. the atomic structure of a neutral sodium atom is represented by Y. Option D
What is atomic structure?Generally, Atomic structure is the structure of an atom, which consists of a nucleus (the center) and protons (which are positively charged), and neutrons (which are neutral).
This structure is referred to as the structure of an atom. Electrons are negatively charged particles that orbit the nucleus, which is located at the center of the atom.
In conclusion, Alkali sodium is reactive. Sodium has 11 protons, 11 electrons, and 12 neutrons. Neutral sodium's atomic structure is Y.
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Match the mineral group to its examples or definition.
sulfide mineral is made of from metal and sulfphur
Sulfide, also written sulphide, is a category of chemicals that contain sulfur and one or more metals. The majority of sulfides have basic structural characteristics, great crystallographic symmetry, and numerous metal-like characteristics, such as metallic lustre and electrical conductivity.
Sulfides include, for instance, chalcopyrite, galena (the primary ore mineral for lead and silver), and cinnabar (the primary ore mineral for mercury) (which provides copper).
Sulfide minerals are composed of sulfur and one or more metals; sulfarsenides have some of the sulfur replaced with arsenic.
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This distance-time graph shows the speeds of four toy cars.
Distance (m)
Based on evidence in the graph, which car is the fastest?
The slope of the distance-time graph is used to determine speed. Vehicle A is travelling more quickly because A's slope is greater than B's slope.
How is a speed-time graph drawn?Distance (m) automobile is the fastest according to the data in the graph
A speed-time graph always plots time on the horizontal axis and speed on the vertical axis. This depicts a particle's motion as it increases in speed from a speed of u at time 0 to v at time t.
A speed-time graph demonstrates how a moving object's speed varies over time. The acceleration increases as the graph becomes more pronounced.
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Answer letter B please
Yeah i just use this calculator
https://www.calculatorsoup.com/calculators/physics/density.php
Label the zeros in this number as either significant or not significant.
0.02050
The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
Significant and non significant zeros,
All zeros between two non - zeros digits are significant like in 0.0205
All leading zeros are not significant .they are nothing than place holders
All trailing zeros to the right of the decimal are significant.
All trailing zeros in a whole no. with no decimal is not significant.
Here,in the no.
0.02050
↓ ↓ ↓ ↓
not significant || significant
Thus,The zeros significant or not significant in number 0.02050 is significant zeros is 2 = in 2050 and not significant zeros is 2 = 0.0
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What is the formula for calculating the density of an object?
(A) mass * volume
(B) mass/area
(C) mass/volume
(D) weight/mass
Answer:
it is option c
Explanation:
mass/volume
If the amount of radioactive iron-59 in a sample prepared for study of iron metabolism in the spleen decreases from 1.6 g to 0.40 g in 84.0 days, what is the half-life of iron-59?
The half life of the radioactive iron-59 is 42 days.
What is half life?
This is the time taken for a radioactive isotope to decay to half of its original size.
The half life of the radioactive iron-59 is calculated as follows;
N(t) = N₀(¹/₂)^t/h
where;
h is the half life of the radioactive iron-590.4 = 1.6(¹/₂)^84/h
log(0.4/1.6) = 84/h log(¹/₂)
-0.602 = 84/h(-0.3)
84/h = 2
h = 42 days
Thus, the half life of the radioactive iron-59 is 42 days.
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0.4g divalent metal (eq.wt=20) is dissolved in 50cc of 0.64N HCL solution.If further 109.2 cc of NaOH is required to neutralize the resultant solution determine the strength of solution NaOH in g/l ?
An atomic mass is the mass of a chemical element's single atom. It involves the masses of the three atomic subatomic particles: protons, neutrons and electrons.
Volume of Naoh(V1)= 30cc
Normality of Naoh(N1)= 1N
Volume of excess Hcl(V2) = ??
Normality of Hcl(N2) = molarity × basicity
= 2×2 = 4 × 1.01 = 4.04N
Using,
V1N1 = V2N2
30×1 = V2 × 4.04
I.e. V2 = 7.42cc
Volume of excess acid = 7.42 cc
Volume of Hcl neutralized by metal= 100 - 7.42
= 92.575 cc
Therefore, gm.eqv of Hcl = gm.eqv of metal
(92.575/1000) × 4.04 = 4/E
I.e E = 10.09
Atomic mass= E × basicity
= 10.09 × 2
= 20.18amu ans
The atomic mass is 20.18 amu
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A drinking glass has a mass of 268.5 g. A 162 mL sample of milk is added to the glass. The mass of the glass containing the milk is found to be 436.2 g. What is the density of the milk?
The density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
What is Density?Density may be defined as a type of physical property that significantly deals with the description of how much space an object or substance takes up with respect to the amount of matter in that object or substance.
In a more simple sense, it is characterized as the measurement of quantity or mass per unit of volume in a particular substance.
According to the question,
The actual mass of milk = 436.28g - 268.58g = 167.7 g.
The volume of milk = 162 mL.
The formula for calculating the density is as follows:
Density = Mass/Volume.= 167.7 g/162 mL= 1.04g/mL.
Therefore, the density of milk is equal to 1.04g/mL when its volume is 162 mL and its actual mass is 167.7 g.
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What did Henry Moseley change about Mendeleev's Periodic table?
O He ordered the elements by atomic mass.
O He ordered elements with similar properties into columns.
O He ordered elements with similar properties into rows
O He filled in blanks by discovering new elements.
Answer: A. He Ordered them by atomic mass.
Explanation:
3) From the electrical conductivity,' section, compare the extent of conductivity of the mixture
containing equal volumes of acetic acid and aqueous ammonia to the conductivity of acetic acid
and ammonia alone. Explain.
The solution of acetic acid and aqueous ammonia are seem to be have more conductivity than the solution of acetic acid and aqueous ammonia alone.
What is Conductivity?Conductivity is defined as the capability of the aqueous solution to carry electric current
It is also defined the reciprocal of the resistivity.
What is Electrical Conductivity?Electrical conductivity is defined as the voltage which is required to obtain an amount of electric current to flow. This is mostly determined by the number of electrons present in the outermost shell; these type of electrons determine the ease by which mobile electrons are generated.
Now, it can explained that the aqueous solution of acetic acid and aqueous ammonia are seem to be have more conductivity because they both react to give the ions CH3COO(-) and NH4+.
But alone they weakly ionize to conduct electric current.
More the electric current more will be the conductivity.
Thus, we concluded that the solution of acetic acid and aqueous ammonia have more conductivity than the solution of acetic acid and aqueous ammonia alone.
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In which of these statements are protons, electrons,
and neutrons correctly compared?
O Quarks are present in protons and neutrons but not in electrons.
O Quarks are present in protons, neutrons, and electrons.
O Quarks are present in neutrons and electrons but not in protons.
• Quarks are present in protons and electrons but not in neutrons.
Neutrons have no charge, protons have a positive charge, and electrons have a negative charge. One proton's positive charge and one electron's negative charge are equal. While electrons have essentially negligible mass, protons and neutrons each have a mass of 1.
In which of these statements are protons, electrons, and neutrons correctly compared?
"Quarks are present in protons and neutrons but not in electrons."
Protons and neutrons contain quarks, while electrons do not. Subatomic particles known as quarks have mass but no charge at all. Quarks are the building blocks of protons and neutrons, but electrons are not because they are energy travelling with an electric charge rather than matter with mass. Given that quarks have mass, they cannot be found in electrons.
Undoubtedly among the tiniest particles in the universe are quarks. They are fundamental, irreducible, and incapable of being broken down into smaller parts.
The gravitational force, electromagnetic force, strong nuclear force, and weak nuclear force are the only four fundamental physical forces that quarks can freely interact with.
There are six different types of quarks, and they are never found in nature alone; rather, they form hadrons, which are composed of two or three quarks and are referred to as mesons or baryons, respectively.
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What types of clothes should we wear in kitchen cotton or silk ?why?
Answer:
I think cotton
Explanation:
Because in the kitchen ,there is heat that makes us sweat as cotton is a good absorber of water, it will keep us cool in hot atmosphere of the kitchen.
Sorry but please recheck it again this is my analysis
Calculate the mass, in grams, of 952 atoms of lithium, Li (1 mol of Li has a mass of 6.94 g).
The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
What is mass?
Mass of the object is defined as anything which occupies space. The atomic number of lithium is 3. 1 mole of lithium has a mass of 6.94 g.
1 mole of atom contains= 6.022 * 10 ^ 23 grams.
952 atom = x
x= 952 * 6.022 * 10^ 23 grams.
x= 5732.94 * 10 ^ 23 grams of lithium
.
Therefore, The atomic number of lithium is 3. 1 mole of li has a mass of 6.94 g.
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Arrange the measurements from longest length to shortest length.
Answer:
[tex]{ \boxed { \rm{ \: \: \: \: \: \: \: 1 \: mi \: \: \: \: \: \: \: \: }}} \\ { \boxed{ \rm{1 \times {10}^{11} \: nm }}} \\ { \boxed{ \rm{ \: \: \: \: \: \: \: \: \: \: 10 \: m \: \: \: \: }}} \\{ \boxed { \rm{ \: \: \: \: \: \: 50 \: in \: \: \: \: \: \: \: \: }}}[/tex]
Explanation:
• For first length:
[tex]{ \tt{ 1 \times {10}^{11} \: nm = (1 \times {10}^{11} ) \times {10}^{ - 9} \: m }} \\ \\ { \tt{ = 1 \times {10}^{(11 - 9)} \: m}} \\ \\ { \tt{ = 1 \times {10}^{2} = 100 \: m }}[/tex]
• For second length is 10 m
• For third length
[tex]{ \tt{1 \: mi = 1609 \: m}}[/tex]
• For forth length;
[tex]{ \tt{1 \: in = 0.0254 \: m}} \\ { \tt{50 \: in = (50 \times 0.0254)}} \\ = { \tt{1.27 \: m}}[/tex]