✧ [tex] \underline{ \underline{ \large{ \tt{A \: N \:S \: W \: E \: R}}}} : [/tex]
[tex] \underline{ \underline{ \large{ \text{Molecular \: Formulaes}}}} : [/tex]
⇾ [tex] \large{ \text{Potassium \: Hydroxide : K \: OH}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Chloride : NaCl}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Hydroxide : NaOH}}[/tex]
⇾ [tex] \large{ \text{Calcium \: Chloride : CaCl}}[/tex]
⇾ [tex] \large{ \text{Sodium \: Bicarbonate} : \tt{Na ( HCO)_{ 3} }}[/tex]
---------------------------------------------------------
☥ [tex] \underline{ \underline{ \large{ \tt{ \: E \: X\: P \: L\: A\: N \: A \: T \: I \: O \: N}}} }: [/tex]
[tex] \underline{ \underline{ \text{Writing \: a \: molecular \: formula}}} : [/tex]
To write a molecular formula , the following steps are usually adopted only when we know the symbol and valencies of elements and radicals present in a molecule.
Step 1 : First , the name of the compound is written.
Step 2 : The symbols of basic and acidic radicals are written side by side.
Step 3 : The valency of each radical is written at the right upper corner of the symbol. The valency of one radical is transferred to another radical and it is written on the right hand side at the bottom corner. If necessary , L.C.M of the valencies us taken to get a simple whole number.
Step 4 : If a compound radical takes part in the molecular formula , the radical is enclosed in brackets and the valency number is written on the right side of the bracket at the bottom of the formula.
For instance :
[tex] \text{Calcium \: \: \: \: \: \: Sulphate}[/tex] [ compound ]
1. [tex] \sf{Ca \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: SO_{4} }[/tex] [ Symbol of basic and acidic radicals ]
2.We know : Valencies of calcium and sulphate are 2 and 2 respectively
3. [tex] \sf{Ca_{2} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: (SO_{4} )_{2} }[/tex] [ Valencies are exchanged and compound radical is enclosed in bracket ]
4.[tex] \sf{CaSO_{4}}[/tex] [ L.C.M is taken to get molecular formula of calcium sulphate ]
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Why does the spoon handle look broken where it enters the surface of the water?
Answer:
The spoon appears to be broken because of refraction. Refraction happens when light travels from one medium to another and changes speed and bends. This also causes objects to look different sizes and shapes when they are submerged in water.
Explanation:
To solve this, we must know the concept behind refraction. Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
What is refraction?Refraction is the bending of a wave as it travels through different media. The two materials' different densities are what lead to the bending. Anytime a light beam enters a material with a differing refractive index at an angle, it refracts. This increase in speed causes a shift in direction.
Due of refraction, the spoon seems to be shattered. When light moves from one medium to another, its speed and direction shift, causing refraction. When items are submerged in water, this also makes them appear to be of varied sizes and forms.
Therefore, due to refraction, the spoon handle look broken where it enters the surface of the water.
To know more about refraction, here:
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Behavioral therapy began with _______________.
A. Ivan Pavlov
B. B.F. Skinner
C. John Watson
D. Erik Erikson
Answer:
B
Explanation:
Behaviour therapy was popularized by the U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts state hospital.
A population of mice, some with light-colored fur and some with dark-colored fur are introduced into a field with dark soil. A few generations later, the majority of the mice have dark-colored fur. Which of the following best explains this change? *
Light-colored mice can run faster.
Dark-colored mice have fewer offspring.
Light-colored mice have changed color over generations.
Dark-colored mice are better able to hide from their predators.
Answer:
Dark-colored mice are better able to hide from predators.
Explanation:
If all of the light mice are eaten, then there are none left to pass on the light-furred gene, meaning that there would be no offspring without dark fur.
The correct option for the given question about Evolution is Option D) "Dark coloured mice are better able to hide from their predators".
What is the Theory of Darwin?
"Survival of the fittest" is explained in the Darwin theory.
It is identical to natural selection. You are regarded as one of the "fittest" if you possess the greatest features or are "fit" enough to live and adapt to your surroundings. However, the ability to reproduce is just as important as simply surviving. You are successful if you can survive and reproduce.
Thus we can conclude that Dark coloured mice are better able to hide from their predators and hence they also satisfies the theory of Darwin "The survival of the fittest" hence this is the reason why after few generation the majority of the mice have dark coloured fur.
Learn more about Evolution here:
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Temperature measures _____________.
A. how much heat an object can produce
B. what the weather will be
C. the total energy in an object
D. the average speed of the particles in a material
Answer:
C
Explanation:
Temperature is the amount of energy an object has in it's thermal energy stores
Why are the offsprings of asexually reproducing organisms genetically identical to their offspring
Answer:
wdym?
Explanation:
A 55 kg person on Earth has the __________mass on the moon.
Answer:
89.1 N
Explanation:
W = m gm = 55.0 x 1.62 = 89.1 N
4. How can acids and bases behave in terms of electrolytes/reactivity?
Answer:
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
Explanation:
Electrolytes are the substances that produce ions when they are dissolved in water. Electrolytes can be categorized as bases, acids, and salts.
Strong acids are strong electrolytes. Such acids ionize completely.
Weak acids and bases are weak electrolytes. Such bases and acids ionize only to a small extent.
A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium-40 and its daughter element Argon-40 (half-life of 1.3 billion years). This mineral would not form with any Argon-40. Consider a crystal with 7 atoms of Argon-40 for every 1 atom of Potassium-40. How many atoms of Potassium-40 were present when the crystal formed for each atom of Potassium-40 that exists today
Answer:
There were originally 8 atoms of Potassium-40.
Explanation:
The half-life of a radioactive material is the time taken for half the original material to decay or the time required for a quantity of the radioactive substance to reduce to half of its initial value.
If the original material formed without any Argon-40, it means that the atoms originally present were Potassium-40 atoms.
Presently, there are 7 Argon-40 atoms for every 1 of Potassium-40, we can deduce the number of half-lifes the Potassium-40 has undergone as follows :
After one half-life, (1/2) there will be one Potassium-40 atom for every Argon-40 atom.
After a second half life, 1/2 × 1/2 = 1/4: there will be one Potassium-40 atom for every three atoms of Argon-40.
After a third half-life, 1/4 × 1/2 = 1/8: there will be one Potassium-40 atom for every 7 atoms of Argon-40.
Since there are 1/8 atoms of Potassium-40 presently, there were originally 8 atoms of Potassium-40.
3) Explain why elements in the same group
similar properties
Answer:
The elements of the same group have the same number of valence electrons, that is why they have similar properties
did anyone do the phase change gizmo ever please give it to me i am not in the mood to try haha
Answer:
I'm going to give it a shot, but I'm not totally sure what you're talking about
LOSPICNOMEWTROS SON INSTRUMENTOS EMPLEADOS PARA CALCULAR DENSIDADES DE SUSTANCIAS LIQUIDAS. SE REALIZO UN EXPERIMENTO PARA DETERMINAR LA DENSIDAD DE UNA SUSTANCIA DESCONOCIDA EN EL LABORATORIO ENCONTRANDO LOS SIGUIENTES VALORES (Picnómetro vacío 8,5g) (Picnómetro lleno 25g) (Capacidad Picnómetro 25mL) . CUAL ES LA DENSIDAD DE LA SOLUCIÓN
Answer:
0.66g/mL
Explanation:
La densidad es una propiedad de la materia definida como la masa de una sustancia en un determinado volumen.
En este problema, podemos hallar la densidad sabiendo que la diferencia de masas del pic vacío y el pic lleno es la masa de la solución y que el volumen que ocupa es de 25mL:
Masa solución:
25g - 8.5g = 16.5g
Así, la densidad será:
16.5g / 25mL =
0.66g/mLIdentify the gas from it calculated molar mass. P = 103.2 kPa V = 225 mL T = 25.00 *C m= 0.375 g N2 Ar CO2 Kr O2 H2 Og Xe H2O He Ne
Answer:
Not sure yet but I will get back
Explanation:
What is the formula for the Ideal Gas Law and what does each variable represent?
Answer:
PV=nRT
Explanation:
P= Pressure
V= Volume
n= amount of substance (usually moles)
R= Ideal Gas Constant (8.314 J/mol*K
T= Temperature
A trait in which one allele for a gene contributes and the phenotype is an intermediate between the dominante
and recessive is what type of trait?
How many moles are present in 29.4g of Aluminum (AI)? *
Answer:
588 mole
29.4
+29.4
5 8. 8g
Someone help please ...
Answer:
Yes
Explanation:
Identify the element that matches this orbital diagram
Answer:
Nitrogen
Explanation:
The electron configuration of nitrogen is:
1s2 2s2 2p3
which satisfies the diagram.
hydrogen + copper(II) oxide= copper + steam, which substance is oxidized. explain your answers
Santee Cooper is stocking lakes Marion and Moultrie with 109,000 sterile grass carp. The grass carp, which eat hydrilla (Invasive species), are the most effective and least Intrusive means to control the weed. What type of control are they using?
A Invasive
B biological
C.chemical
D physical
Answer:
biological
Explanation:
i took the test and got it right
spheres are not perfect in space. But <> is in the cause of their shape.
Answer:
<> yes
Explanation:
A football player kicks a 0.94 kg football with a force of 2.4 N. Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2. The acceleration of the football is ____ m/s2.
Answer:
it's 2.6 just did it the other person is wrong.
Its 2.6 the other guy is right
i did the assignment
NEED HELP QUICK PLS! :)
SOMEONE hELP ASAP
Which of the following statements about humans and biodiversity are TRUE?
Choose all that apply:
Humans benefit from biodiversity as a source of food, medicine, and raw materials.
Biodiverse ecosystems provide benefits to humans, such as cleaning water or pollination of crops.
Humans benefit from biodiversity but do not rely on biodiversity. Any natural materials that run out can be replaced by synthetic materials.
Humans are not affected by loss of biodiversity.
Answer:
Iiiiiiddddddkkkkkkkkkk
Explanation:
Answer:
second onw\e
Explanation:
What is concentration of hydrogen ion a given acid if its PH value is 9?
what is the main function of photosynthesis
Answer:
to provide food to the plant also known as glucose
Pls 50 points right answer gets brainliest
Explain the meaning of thermal energy transfer and give specific examples of conduction, convection, and radiation.
Answer:
Thermal energy transfer involves the transfer of internal energy. The three types of thermal energy transfer are conduction, convection and radiation. ... Those are both good examples of convection, the movement of warm particles from warmer to cooler locations, Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.
Explanation:
Hope this helps!
Answer:
thermal energy: the part of total internal energy that can be transferred (a portion of the kinetic energy)
heat is the thermal energy that flows from one substance to another due to a temperature difference.
Thermal energy is measured in temperature change.
Thermal energy transfer stops when thermal equilibrium is achieved (Both substances at the same temperature).
conduction: Transfer of thermal energy through a solid object like heat transferring up a metal spoon from a hot cup of coffee.
convection: the transfer of thermal energy due to the movement of a liquid or gas caused by differences in temperature. Only in a fluid (liquid or gas). Breezes, ocean currents.
radiation: Transfer energy with or without matter. Warming from the Sun, microwave oven.
If some methane gas at 115 kPa and 33C is allowed to expand to 15.0dm^3 from 8.00 dm^3 when the temperature changed to 51.2 C. What pressure will the same amount of gas exert?
Answer:
228.4 kPa
Explanation:
From thw question,
PV/T = P'V'/T'..................... Equation 1
Where P = Inital pressure, T = Initial Temperature, V = Initial Volume, P' = fInal Pressure, V' = Final volume, T' = Final Temperature.
Make P' the subject of the equation
P' = PVT'/TV'...................... Equation 2
Given: P = 115 kPa, V = 15.0 dm³, T = 33°C = (33+273) K = 306 K, T' = 51.2°C = 51.2+273 = 324.2 K, V' = 8.00 dm³
Substitute these values into equation 2
P' = (115×15×324.2)/(306×8)
P' = 228.4 kPa.
Can someone plz help me with this one problem plz
(I’m marking brainliest)!!!!
Answer:
the best answer is c because when there is more ppl there are less resources
Pleseee help me pretty please ✨
Answer:
6 N.
Every thing has equal and opposite reaction.
Answer:
The answer is C I believe, I do not know for sure but I think that is the answer..
I'm sorry if I'm wrong.
Explanation:
Hello, can anyone help me with this question?
Answer: a. [tex]11.9\times 10^{23}atoms[/tex] of carbon
b. [tex]35.7\times 10^{23}atoms[/tex] of hydrogen
c. [tex]5.96\times 10^{23}atoms[/tex] of oxygen
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{45.6g}{46.07g/mol}=0.989moles[/tex]
a) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]2\times 6.023\times 10^{23}=12.05\times 10^{23}atoms[/tex] of carbon
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{12.05\times 10^{23}}{1}\times 0.989=11.9\times 10^{23}atoms[/tex] of carbon
b) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]6\times 6.023\times 10^{23}=36.14\times 10^{23}atoms[/tex] of hydrogen
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{36.14\times 10^{23}}{1}\times 0.989=35.7\times 10^{23}atoms[/tex] of hydrogen
c) 1 mole of ethanol [tex](C_2H_5OH)[/tex] contains = [tex]6.023\times 10^{23}atoms[/tex] of oxygen
Thus 0.989 moles ethanol [tex](C_2H_5OH)[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.989=5.96\times 10^{23}atoms[/tex] of oxygen