Answer: freezing point of water 273.15K, boiling point of water 373.15 K
Explanation:
The Kelvin scale starts at the lowest possible temperature, absolute zero. This is 0 Kelvins (K)= -273.15 deg C. Hence water freezes at 0 deg C = 273.15 K and boils at 100 deg C = 373.15 K
Most favourable conditions for electrovalency are
(a) Low charge on ions, large cation and small anion
(b) High charge on ions, small cation and large anion.
(c)X High charge on ions, large cation and small anion
(d) Low charge on ions, small cation and large anion
bila da
Answer:
A: Low charge on ions, large cation and small anion
Explanation:
Electrovalency is defined as process of transfer of electrons from its valence shell from one atom to another to form ions in such a manner that both elements will achieve stable electronic configuration.
Now cations are positively charged ions and therefore the bigger the cation, the more electrons it looses and thus the more it favors Electrovalency.
While an ions are negative and the lesser they are the more they favor Electrovalency.
Thus, the correct answer is option A
7.08 moles of ammonia (NH3) is formed in the following reaction. How many grams of
hydrogen reacted?
3H2 + N2 + 2NH3
Answer:
Mass = 21.24 g
Explanation:
Given data:
Number of moles of ammonia = 7.08 mol
Mass of hydrogen reacted = ?
Solution:
Chemical equation:
3H₂ + N₂ → 2NH₃
Now we will compare the moles of ammonia and hydrogen.
NH₃ : H₂
2 : 3
7.08 : 3/2×7.08 = 10.62
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 10.62 mol × 2 g/mol
Mass = 21.24 g
Which body system or systems are affected by asthma?
Answer:
The lungs
Explanation:
Asthma is a disease that affects the airways of your lungs. With asthma, your airways' lining tends to always be in a hypersensitive state characterized by redness and swelling. Causing the airways to swell and, in severe cases, close completely off.
hope this helps, this should also probably be in biology:)
The number of atoms or molecules in a mole is known as the __________ constant.
Answer: Avogrado's Constant
Explanation:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.
. When a person weighs himself in pounds, which system of measurement is he using?
Answer:
answer: Weight is a 'force' and in the imperial system, it is measured in pounds-force (lbf or lbf). You might hear this term used together with the term 'slug'. A slug has a mass of 32.174049 lb. Explanation:
Explanation:
The unit pound is a unit of mass which is from the British imperial units of measurements. Pound is not included in CGS or SI units of mass.
What is mass?Mass of a substance is its total amount which can be expressed in any units such as g, Kg etc. Our mass is affected by the gravity and thus the total weight of a body is mass multiplied by gravity.
There are different system for units and each units of a measurement is interrelated. Units are very significant in measurements and to identify the variables.
The most commonly used unit system is international system of units called the SI system. Where the mass length and time are in Kg, m and seconds. In CGS system it is gram, meter and seconds.
Pound is unit of mass from imperial unit system of britain. One pound = 0.4533 Kg.
To find more about unit systems, refer the link below;
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what is smaller than atoms and bigger than molecule
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of of phosphoric acid
Answer:
4.3 g
Explanation:
Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of 2.8 g of phosphoric acid?
Step 1: Write the balanced equation
3 NH₃ + H₃PO₄ ⇒ (NH₄)₃PO₄
Step 2: Calculate the moles corresponding to 2.8 g of H₃PO₄
The molar mass of H₃PO₄ is 97.99 g/mol.
2.8 g × 1 mol/97.99 g = 0.029 mol
Step 3: Calculate the moles of (NH₄)₃PO₄ produced from 0.029 moles of H₃PO₄
The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.029 mol = 0.029 mol.
Step 4: Calculate the mass corresponding to 0.029 moles of (NH₄)₃PO₄
The molar mass of (NH₄)₃PO₄ is 149.09 g/mol.
0.029 mol × 149.09 g/mol = 4.3 g
Kp for the following reaction is 0.16 at 25 degree C. 2 NOBr(g) 2 NO(g) Br_2(g) The enthalpy change for the reaction at standard conditions is
Answer:
Explanation:
Given that:
[tex]2 NOBr_{(g)} \iff 2 NO_{(g)} + Br_{2(g)}[/tex]
From above:
[tex]K_p = 0.16 = \dfrac{(P_{NO})^2 (P_{Br})}{(P_{NOBr})^2}[/tex]
To predict the effect of the addition of Br₂(g);
The addition of Br₂(g) will favor the equilibrium to shift to the left i.e. formation of NOBr
The removal of some NOBr will cause the equilibrium position to shift to the left side. This is because concentration on the left side is decreased and the concentration on the right side will be increased. Thus, the equilibrium will shift towards where the concentration is reduced which is the left side.
In the first 21.0 s of this reaction, the concentration of HBr dropped from 0.550 M to 0.506 M . Calculate the average rate of the reaction in this time interval.
Answer:
1.048x10⁻³M/s is the rate of reaction
Explanation:
Based on the reaction:
2HBr → H₂ + Br₂
The rate of reaction is defined as:
1/2 Δ[HBr] / Δt
1/2 because the reaction is consuming 2 times HBr per mole of reaction
Where Δ[HBr] is 0.550M - 0.506M = 0.044M
And Δt is 21.0s. The average rate of reaction is:
1/2 0.044M / 21.0s =
1.048x10⁻³M/s is the rate of reactiona glass of organge juice contains .85dl of juice. how many millimeters of orange juice is that
Answer:
85 ml
Explanation:
move the decimal place over two times
A person lifts a 10 N box 1 m off the ground in 1 s. How much power does she use? P = W/t
A. 100 W
B. 20 W
O C. 10 w
O D. 12 W
Answer:
C. 10 W.
Explanation:
Hello!
In this case, since the power the person uses to lift the 10-N load is computed by using the formula:
[tex]P=\frac{W}{t}[/tex]
Whereas W is the work and t the time; we can compute the work by multiplying the force applied in 1 m:
[tex]W=10N*1m=10J[/tex]
Now, we divide it by the time to obtain:
[tex]P=\frac{10J}{1s}=10W[/tex]
Since joules over seconds are watts.
Best regards!
Water is one of the most important resources for humans. Some areas are known to have no water shortages, where other areas are now suffering the scarcity of water. List some factors that change the distribution of water abundance.
(written response)
Answer:
The factors are various, although there are main and accessories.
The main factor is the climate of the area, that is, if it is a rainier climate, there will be more water masses in the lands where this climate abounds (usually it is wet).
Other factors are: geographical features, flows, the path of rivers, lakes or lagoons, the presence or absence of ports, the number of trees and the distribution of rocks.
Explanation:
Another important factor is the height of the land, the higher the level of the earth, the more difficult it will be to accumulate water, this is how low areas are also flooded.
A typical person has an average heart rate of 69.0 beats/min. Calculate the given questions. How many beats does she have in 7.0 years? How many beats in 7.00 years? And finally, how many beats in 7.000 years? Pay close attention to significant figures in this question.
Answer:
See explanation
Explanation:
Average heart beat = Number of heart beats/ time
7.0 years = 7.0 * 365 * 24 * 60 = 3679200 minutes
If there are 69 beats in 1 minutes
There are x beats in 3679200 minutes
x = 253865 beats
x = 254000.00 beats ( to 3 sf)
beats in 7.00 years = 254000.000 beats
beats in 7.000 years = 254000.0000 beats
A cube of tin that is 112 mm on each side has a mass of 8.21 grams. A single tin atom has a mass of 118.7 amu. How many tin atoms are in the cube? Report your answer in scientific notation with 3 sig figs. Use e for scientific notation, for example 100. would be written as 1.00e+2
Answer:
4.17e+22 atoms of tin are present in the cube
Explanation:
We don't require the size of the cube. With the mass and the molar mass of tin = 118.7 amu we can find moles of Tin. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:
Moles Tin:
8.21g * (1mol / 118.7g) = 0.0692 moles Tin
Atoms Tin:
0.0692 moles Tin * (6.022x10²³ atoms / mol) =
4.17e+22 atoms of tin are present in the cube3) 46.7 L of a gas is initially at a pressure of 662 torr and a temperature of 266 K. If the volume decreases to 35.0 L and the temperature increases to 342 K, what is the new pressure?
Answer:
The new pressure is 1,135.67 torr
Explanation:
Boyle's law establishes the relationship between pressure and volume of a gas when the temperature is constant, establishing that the pressure of a gas in a closed container is inversely proportional to the volume of the container. Mathematically, this law says that the product of pressure and volume is constant:
P*V=k
Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law states that the volume is directly proportional to the temperature of the gas. So, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Finally, Gay-Lussac's Law is a gas law that relates pressure and temperature at constant volume. This law says that the pressure of the gas is directly proportional to its temperature:
[tex]\frac{P}{T} =k[/tex]
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T} =k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]
In this case:
P1= 662 torrV1= 46.7 LT1= 266 KP2= ?V2= 35 LT2= 342 KReplacing:
[tex]\frac{662 torr*46.7 L}{266 K} =\frac{P2*35 L}{342 K}[/tex]
Solving:
[tex]P2=\frac{342 K}{35 L} *\frac{662 torr*46.7 L}{266 K}[/tex]
P2= 1,135.67 torr
The new pressure is 1,135.67 torr
Which element easily gains one electron to form a negative ion?
Flourine
Magnesium
Nitrogen
Lithium
Answer: Fluorine
Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.
Answer:
Fluorine.
Explanation:
I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.
16.
Mg(OH)2 +
H.PO.-> ||||Mg(PO2 +
H2O
2,3,6,1
3, 3, 1,6
3, 2, 1,6
2,3,1,3
17. Cr+Fe(NO.)2 ->
Fe +_ Cr(NO3)2
4,6,6,2
0 2,3,2,3
0 1,3,3,1
02.3, 1.2
0 2,3,3,2
these are two questions separated but I would REALLY appreciate if someone could do them it’s for a test
Answer:
3,2,1,6
2,3,3,2
Explanation:
HOPE THIS HELPED
Atoms are the same thing as molecules
Question 2 options:
True
False
How many grams are in 4.63 x 1024
molecules of CCl4?
Answer:
[tex]m=1,182.8g[/tex]
Explanation:
Hello!
In this case, since the relationship between molecules and mass is first analyzed via the Avogadro's number to compute the moles in the given molecules:
[tex]mol=4.63x10^{24}molec*\frac{1mol}{6.022x10^{23}molec}=7.69mol[/tex]
We now use the molar mass of carbon tetrachloride (153.81 g/mol) to obtain the required grams:
[tex]m=7.69mol*\frac{153.81g}{1mol} \\\\m=1,182.8g[/tex]
Best regards!
which is the formula of nitrogen (I) oxide?
Answer:
Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide (NO) and nitrogen dioxide (NO2). Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N2O), and nitrogen pentoxide (NO5).
Explanation:
The ideal bond angles marked 1, 2, and 3 in the molecule below are about _______, ______, and ______.
Answer:
D= 109.5 degrees, 109.5 degrees, 120 degrees
Explanation:
The bond angle observed for any bond between two chemical species depends on the hybridization of the atoms.
However, for organic compounds, single bonds normally involve sp3 hybridized atoms with a bond angle of 109.5 degrees such as in the positions marked a and b.
However, a double bond is made of atoms in sp2 hybridized state with a bond angle of 120 degrees such as in c.
A compound is found to contain 64.80 % carbon, 13.62 % hydrogen, and 21.58 % oxygen by weight. What is the empirical formula for this compound
Answer:
Empirical formula is C₄H₁₀O
Explanation:
Values for C, H and O are determined as centesimal composition.
64.80 g of C in 100g of compound
13.62g of H in 100 g of compound
21.58 g of O in 100 g of compound.
We convert the mass to moles:
64.80 g . 1mol/ 12g = 5.4 moles of C
13.62 g . 1 mol /1g = 13.62 moles of H
21.58 g . 1 mol/16g = 1.35 moles of O
We pick the lowest value and we divide:
5.4 moles of C / 1.35 = 4 C
13.62 moles of H / 1.35 = 10 H
1.35 moles of O / 1.35 = 1 O
Empirical formula is C₄H₁₀O, it can be the diethyl ether.
We confirm, the excersise is well done.
Molar mass = 74g/mol
74 g of compound we have (12 . 4)g of C
In 100 g of compound we may have (100 . 48) / 74 = 64.8 g
8. A moving truck is loading heavy furniture using a long ramp. Why does this simple machine make the work easier?
The ramp makes the furniture weigh less.
It takes less force to move the furniture up the long ramp.
The ramp acts like a lever to make the work easier.
The furniture fits on the ramp.
Can ya help me out real quick?
18) Choose the best answer.
Calculate the amount of heat required. You will need to use your Periodic Table and Table B-3 below.
table - Specific Heat of Selected Substances
How much heat is released by lowering the temperature of 825 grams of molten (liquid) lead at 800K to solid lead at 295K? Lead melts at 600.61K.
-94.54kJ
-8873kJ
302kJ
-204kJ
209kJ
Answer:
302 kj heat is released by lowering the temperature
302kJ is the amount of heat which is released by lowering the temperature of 825 grams of molten (liquid) lead at 800K to solid lead at 295K. Therefore, the correct option is option C.
What is heat?Heat is energy that is transmitted from one object to another as a result of a temperature differential. When two bodies of differing temperatures come into contact, energy is transmitted as heat flows first from hotter to the colder.
melting point of lead= 328°C.
T₁ = 328 + 273 = 800K
T₂ = 295K
T₃ = 600.61K
latent head of fusion of lead = 4.8 kJ/mol
specific heat of solid lead= 0.13 J/g/K
specific heat of liquid lead = 0.14 J/g/K
heat= mS∆T + (m/M)Lf + mS∆T'
= 23g × 0.13 J/g/K × (601 - 297)K + 23g/207g/mol × 4.8 kJ/mol + 23g × 0.14 J/g/K × (702 - 601)K
=302kJ
Therefore, the correct option is option C.
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A sheet of aluminum foil has a volume of 0.555 cm3. If the foil measures 10.0 cm by 10.0 cm, what is the thickness of the foil?
Answer: B) 0.005 55 cm
Hope you have a blessed day!
PLS HELP ASAP THIS IS DUE IN 10 MINUTES I NEED NUMBER 3, 4 AND 5!
Answer:
1. B
2. A
3. E
4. D
5. C
Explanation:
Why is the earth atmosphere located above earth crust
Answer:
The atmosphere is the thin envelope of gas molecules surrounding the Earth; it is held down by Earth's gravitational pull. The atmosphere is concentrated at the Earth's surface and rapidly thins as you move upward, blending with space at about 100 miles above sea level
Explanation: science
Answer:
Öncelikle burda soru Why is the earth atmosphere located above earth crust yani Türkçe olarak Dünya atmosferi neden yer kabuğunun üzerinde yer alıyor diyor
a. A container has a volume of 20 m3 and initially it contains 25 kg of methane at a pressure of 10 bar. Determine the specific volume in m3/kg. b. Add 5 kg of Ethane to the tank. What is the specific volume of the mixture in m3/kg
Answer:
a. 0.80 m³/kg
b. 0.67 m³/kg
Explanation:
a.
Step 1: Given data
Volume of the container (V): 20 m³
Mass of methane (m): 25 kg
Step 2: Calculate the specific volume (v) of methane
Specific volume is defined as the number of cubic meters occupied by one kilogram of matter.
v = V/m
v = 20 m³/25 kg = 0.80 m³/kg
b.
Step 1: Calculate the mass of the mixture
m = m(methane) + m(ethane)
m = 25 kg + 5 kg = 30 kg
Step 2: Calculate the specific volume (v) of the mixture
v = V/m
v = 20 m³/30 kg = 0.67 m³/kg
4. What is the specific heat of copper if it took
57.8 J of heat energy added to 10 grams to
produce a 15°C temperature change?
Answer:
Specific heat capacity of copper is 0.385 J/g.°C
Explanation:
Given data:
Specific heat capacity of copper = ?
Heat absorbed by copper = 57.8 J
Mass of copper = 10 g
Temperature changes = 15°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
by putting values
57.8 J = 10 g × c × 15°C
57.8 J = 150 g.°C × c
c = 57.8 J / 150 g.°C
c = 0.385 J/g.°C
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of copper is 0.385 J/g.°C.
What is the number of electrons in an atom that
has 3 protons and 4 neutrons?
(1) 1
(3) 3
(2) 7
(4) 4
Answer:
(2)
Explanation:
Answer:
7 is answer.
Explanation:
therefore, the mass number of an atom with 3 protons,4 neutrons,and 3 electrons is 7.
I hope it's helpful!
