Answer:
It's take 1 and a half hours
Explanation:
Ugbdunvisrtg
name any two mix metals with one use from each.
Answer:
bronze, copper
Explanation:
bronze is used to make medals and carve statues
copper is used to make wire and utensils
explain how a kaleidoscope can be used as evidence to explain the behavior of light waves
(help asap) PLEASE HELP
Answer:
As you turn the tube you can see patterns of colors at the other end of the tube. A kaleidoscope works by reflecting light. Light travels in a straight line. When light bumps into something it changes direction.
Kaleidoscopes are made with two or more mirrors. Light reflecting between these mirrors produces multiple virtual images of stunning beauty. ... Light rays are assumed to bounce off the mirrors like a ball bounces off a hard surface. Formally stated, the angle of incidence equals the angle of reflection.
Explanation:
Our solar system is more than _________ in diameter.
Answer: 287.46 billion km
Explanation: calculated it myself. nah but thats the answer
who's know this one?
sand + witch?
Answer:
The Magician who lives in sand is called sand witch.
And sandwich is The name of one kind of food.
Answer:
Sandwich its food you eat it
Explanation:
which element is most reactive among aluminium, boron, calcium and beryllium? Give reason.
Answer:
Well, if you check the reactivity series, calcium is more reactive than magnesium. This means there's a a trend of increasing reactivity as we go down the group. As beryllium is above magnesium, it must be the least reactive. Then magnesium is in the middle and the most reactive has to be calcium.
Answer:
Aluminium because highl elecronegativety element and more metalic hign melting and boling point from the other
What is the value of the quantum number n for a spin-up electron in a 2p orbital?
A. +2
B. -1/2
C. +1
D. +1/2
Answer:
+1/2
Explanation:
spin up is always +1/2
What is the name of Ba(OH)2
Answer:
Barium Hydroxide
Explanation:
..........................
A slide 3.3 m long makes an angle of 32° with the ground. How high is the top of the slide above the ground?
A. 2.06 m
B. 2.8 m
C. 1.75 m
D. 1.84 m
Calculate the number of moles of NaOH in an aqueous solution of 36 cm3 of 0.1 mol dm−3.
Answer:
0.0036 moles of NaOH are present
Explanation:
A solution of 0.1mol/dm³ contains 0.1 moles of solute (In this case, NaOH), per 1 dm³ of solution.
36cm³ are in dm³ (1000cm³ / 1dm³):
36cm³ * (1dm³/1000cm³) = 0.036dm³
The moles are:
0.036dm³ * (0.1mol/dm³) = 0.0036 moles of NaOH are present
Which of the following is correct for adsorption theory of Heterogeneous catalysis? Statement-I : This theory explains why the catalyst remains unchanged in mass and chemical composition at the end of the reaction. Statement-II : This theory explains the action of catalytic promoters and catalytic poison.
Statement-I is true, Statement-II is false
Statement-I is false, Statement-II is true
Both Statement-I and Statement-II are true
Both Statement-I and Statement-II are false
please answer rightly
Answer:
The correct answer is - Statement I is true, Statement-II is false.
Explanation:
According to Le Châtelier's principle, how will a decrease in concentration of a reactant affect the equilibrium system?
Answer:
a decrease in concentration affects the equilibrium
Explanation:
disturbance: equilibrium was disturbed by a decrease in concentration
response:system acts so as to increase concentration
reaction favoured: forward reaction
concentration: concentration of ...... ND ....... increases ND that of ......(product)decreases
what are the compounds for the chemical formula B4S
Answer:
boron sulfide
b=boron
s=sulfer
Explanation:
a) explain why caesium is more reactive than potassium.
b) Write the formula of
i) caesium nitrate
ii) caesium sulphate
Answer:
Explanation:
(a) Firstly, caesium abd potassium are both in Group 1 of the periodic table. Group 1 metals (also called alkali metals) are the most reactive metals of the periodic table. Caesium is more reactive than Potassium because it has a higher electropositivity than Potassium. Electropositivity is the tendency of a metal to donate electron(s) to form a cation. Electropositivity increases down the group; this is because it is easier for atoms to loose electrons on the outermost shell that are far away from the central nucleus as against atoms whose outermost electrons are closer to the central nucleus. Thus, the more "bulky" an atom is, the farther it's outermost electrons (valence electrons) get from the central nucleus and the easier it is to lose the outermost electron(s). And the easier it is for the valence electron(s) to be removed, the more reactive the atom would be and vice-versa.
Caesium is more reactive than potassium because it is more bulky than potassium, with an atomic number of 55, while potassium has an atomic number of 19.
NOTE: The closer an electron is to the nucleus, the more difficult it is to be removed from it's shell.
(b) i. Formula for Caesium Nitrate:
Symbol for Caesium is Cs and Nitrate is NO₃⁻.
Cs⁺ + NO₃⁻ ↔ CsNO₃
Formula for Caesium Nitrate is CsNO₃
ii. Formula for Caesium sulphate
Symbol for caesium is Cs and Sulphate is SO₄²⁻
Cs⁺ + SO₄²⁻ ↔ Cs₂SO₄
Formula for Caesium sulphate is Cs₂SO₄
NOTE: When writing the formulae, the charges would be exchanged to form the subscript as seen on the product sides above.
why doesn't calcium react with water in your body
explain pls
Answer:
Bones aren't made of calcium metal. Bones are a collegun structure filled in with mostly calcium carbonate and some calcium phosphate
Answer:
Bones aren't made of calcium metal. Bones are a collegun structure filled in with mostly calcium carbonate and some calcium phosphate
Explanation:
I hope this helps
please help me I have to submit
Answer:
A FUSE is a type of conductor which protects the circuit by shorting it down when there is excess flow of current passing through it.
Explanation:
A fuse wire is made up of conducting materials such as alloy of tin and lead that has high resistivity. It has a low melting point of 200°C. It works based on the principle of heating effect of electric current. The functions of fuses include the following:
--> Fuses are made up of thin wire CONDUCTORS which interrupts or breaks the current flow of a circuit when in excess, thereby protecting the circuit from damage.
--> it prevents overload of current. In the event where too many appliances are connected to a single circuit, this can lead to overload which triggers a fuse to terminate the circuit connection.
--> It prevents total black-out: SWITCH-LIKE devices known as CIRCUIT BREAKERS share this function with the fuses. The nearest circuit breaks if any dysfunction occurs in the components of the circuit thereby preventing blackout.
Which of the Following Correctly Balances this Equation? _H2+_Cl2 --> _HCl
Which fundamental force(s) can act over very long distances?
A. Gravity and electrostatic force
B. Strong nuclear force and weak nuclear force
C. Gravity only
D. Electrostatic force and strong nuclear force
Answer:
C. Gravity only
Explanation:
8. (05.03 MC) How does temperature influence the appearance of a star? Give an example in your response. (4 points)
Answer:
Stars have the different colors that make up white light, the color of a star is related to the wavelength of the light which is emitted by the star which is related to the temperature of the star's surface
Very hot temperatures yield hotter wavelength, which light having short wavelength being bluish, the blue and blue-white stars are the hottest stars, while stars which emit longer wavelength and therefore have a color of brown and red have a cooler surface temperature
The surface temperature of a star also has an effect on the bright appearance of a star. The higher the temperature of a star the higher the heat energy given off and the brighter the star will be, as a star that gives off more energy is brighter than one that gives less energy
Explanation:
Un compuesto orgánico que contenía solo H y C fue quemado en corriente de O2, encontrándose que 0.210 g daban 0.660 g de CO2.La densidad del vapor del compuesto es de 1.87 g/dm3 a 273 °K y 1 atm. ¿Cuál es la fórmula molecular?
Answer:
[tex]C_3H_6[/tex]
Explanation:
¡Hola!
En este caso, basado en la información dada, es posible calcular las moles de carbono en el compuesto al usar la masa molar del CO2 y la siguiente relación molar:
[tex]n_C=0.660gCO_2*\frac{1molCO_2}{44.01gCO_2}*\frac{1molC}{1molCO_2}=0.015molC[/tex]
Ahora, calculamos las moles de hidrógeno restando la masa de carbono de la de la muestra basado en el siguiente factor molar:
[tex]m_{H}=0.210g-0.015molC*12.01gC/molC=0.030molH[/tex]
Entonces la formula empírica del compuesto resulta:
[tex]CH_2[/tex]
Dado que el carbono y el hidrógeno están en una relación 1:2. Ahora bien, calculamos la masa molar del gas considerando la presión, densidad y temperatura del mismo:
[tex]PV=nRT\\\\PV=\frac{m}{MM}RT \\\\MM=\frac{m}{V}\frac{RT}{P}=\frac{dRT}{P}\\\\MM=\frac{1.87g/dm^3*0.08206\frac{atm*L}{mol*K}*273K}{1atm}=41.9g/mol[/tex]
Es decir que la fórmula molecular y la empírica están en una relación de 3, por lo que la fórmula molecular resulta:
[tex]C_3H_6[/tex]
¡Saludos!
TIMED PLS HELP ASAP AND WILL GIVE BRAINLIST
Given the following reaction:
2 Al + 2 KOH + 4 H2SO4 + 22 H2O --> 3 H2 + 2KAl(SO4)2•12H2O
If you start with 8.3 mL of 9.9M sulfuric acid, what is the theoretical yield of alum?
Answer: The theoretical yield of alum is 12.09 g
Explanation:
Molarity is calculated by using the equation:
[tex]\text{Molarity}=\frac{\text{Moles}}{\text{Volume}}[/tex] ......(1)
We are given:
Molarity of sulfuric acid = 9.9 M
Volume of solution = 8.3 mL = 0.0083 L (Conversion factor: 1 L = 1000 mL)
Putting values in equation 1, we get:
[tex]\text{Moles of sulfuric acid}=(9.9mol/L\times 0.0083L)=0.08217mol[/tex]
The given chemical equation follows:
[tex]2Al+2KOH+4H_2SO_4+22H_2O\rightarrow 3H_2+2KAl(SO_4)_2.12H_2O[/tex]
By the stoichiometry of the reaction:
4 moles of sulfuric acid produces 2 moles of alum
So, 0.08217 moles of sulfuric acid will produce = [tex]\frac{2}{4}\times 0.08217=0.0411mol[/tex] of alum
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(2)
Molar mass of alum = 294.24 g/mol
Plugging values in equation 2:
[tex]\text{Mass of alum}=(0.0411mol\times 294.24g/mol)=12.09g[/tex]
Hence, the theoretical yield of alum is 12.09 g
What effect will this decision have on the American political process? Rucho, et al v. Common Cause
Answer:
If electoral districting is left to incumbent legislatures, it becomes a tool to stack the political process against disempowered opponents
Explanation:
A student accidentally left a bottle of ammonia unclosed in the corner of a laboratory. After a few minutes the entire laboratory smelled of ammonia. Which process has occurred?
Diffusion
Distillation
Evaporation
Brownian motion
Which of these compounds would you predict
to have the highest boiling point?
C₂H6
C5H12
C6H14
CH10
C3H8
Answer:c6h14
Explanation:
What is the volume of 2 mol of chlorine gas at STP?
2.0 L
11.2 L
22.4 L
44.8 L
Answer:
44.8 L
Explanation:
Using the ideal gas law equation:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
At Standard temperature and pressure (STP);
P = 1 atm
T = 273K
Hence, when n = 2moles, the volume of the gas is:
Using PV = nRT
1 × V = 2 × 0.0821 × 273
V = 44.83
V = 44.8 L
Answer:
44.8L
Explanation:
PLEASE HELP THIS IS AN EMERGENCY!!!!!
An atom's electron configuration ends with 3p3. If another atom has nine more electrons, what would be the continuation of the electron configuration? (5 points)
A.)3p64s23d4
B.)03p34s23d7
C.)3p63d44s2
D.)3p33d74s2
Answer:
A.) is the correct answer
The continuation of the electronic configuration would be 3p6, 4s2, 3d4
The initial p-orbital (the 3p3) is incompletely filled. Thus, the first thing would be to fill it completely (3p6) so as to obey the orbital-filling rule. This leaves 6 more electrons
After 3p orbital, the next orbitals are 4s, 3d, 4p, 5s, etc.
The 4s orbital will take a maximum of 2 electrons, leaving 4 more electrons.
Next would be the 3d orbital which can take a maximum of 8 electrons, but only 4 electrons are left.
Thus, the electronic configuration would be 3p6, 4s2, 3d4.
More on electron configuration can be found here: https://brainly.com/question/18914648?referrer=searchResults
Tertiary alkyl halides show SN1 reactions mostly...... Why?
Answer:
Generally SN1 reactions are carried out in polar protic solvents. The energy required for breaking the C-X bond is obtained through solvation of halide ion with the proton of the solvent. Tertiary alkyl halides undergo SN1 reaction very fast because of the high stability of tertiary carbocations.
When copper is heated in air, the solid product that is formed has a greater mass than the original copper. When calcium carbonate is heated in air, the solid product that is formed has less mass than the original
calcium carbonate. Why is the mass of the solid product greater in one reaction but less in the other reaction?
Answer:
When heated, oxygen reacts with copper to form copper oxide. If this reaction occurs in a sealed container, will the mass of the container and everything in it increase, decrease, or stay the same and why? The mass will increase because a new kind of molecule is formed.
Explanation:
As above, carbonates decompose upon heating to give the metal oxide and carbon dioxide. The mass is lost as carbon dioxide.
To solve this we must be knowing each and every concept related to mass. Therefore, Carbon dioxide is released as the mass is depleted when carbonates are heated.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes.
When copper was heated in the air, the resulting solid product has a larger mass than the initial copper. When calcium carbonate was heated in air, the resulting solid product has much less mass than the initial calcium carbonate. When carbonates are heated, they breakdown into metal oxides and carbon dioxide. Carbon dioxide is released as the mass is depleted.
Therefore, Carbon dioxide is released as the mass is depleted.
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Which of the following illustrates a single-replacement reaction?
A. CaCl2 + Na2CO3 → CaCO3 + 2Naci
O B. 2Fe + 3Br2 → 2FeBr3
O C. Ba(NO3)2 + NISO4 → BaSO4 + Ni(NO3)2
D. Fe + CuSO4 → Cu + FeSO4
The equation Fe + CuSO₄ → Cu + FeSO₄ illustrates the single displacement reaction. Hence Option (D) is the correct answer.
What is Single replacement reaction ?
A single replacement reaction, sometimes called a single displacement reaction, is a reaction in which one element is substituted for another element in a compound.
The starting materials are always pure elements, such as a pure zinc metal, iron or hydrogen gas, plus an aqueous compound.
Therefore, the equation Fe + CuSO₄ → Cu + FeSO₄ illustrates the single displacement reaction. Hence Option (D) is the correct answer.
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The diagram shows the breathing system in a human. What does label 1 show?
Answer:
parietal pleura
Explanation:
The pleurae, which are serous membranes, divide the thoracic cavity's wall from the lungs. The parietal pleura covers the interior of the thorax, mediastinum, and diaphragm, while the visceral pleura covers the surface of the lungs.
What is the function of parietal pleura?The perianal pleura, the outer layer, is attached to the chest wall. The lungs, mediastinum's neurovascular structures, and bronchi are all covered by the inner layer (visceral pleura).
The pleura's role in breathing is to enable the lungs to expand and collapse as efficiently as possible.
The parietal and visceral pleura can move over one another without rubbing against one another thanks to the pleural fluid's lubricating properties. The pleural layers themselves produce this fluid.
Therefore, parietal pleura, which surround the lungs in thoracic cavity.
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2. List and elaborate on at least two limitations of the 24-hour recall as a
method of diet assessment (Each item .5 pt for a total of 1 pt, support
for each response 5 pt for a total of 1 pt = 2 pts)
Answer:
The correct answer is - may not be typical, and participant burden.
Explanation:
The 24-hour recall is nothing but a retrospective method of diet assessment. In this method, an individual is interviewed about his or her diet consumption during the last 24 hours.
The disadvantages or limitations of this method include the inability of a single day's intake to describe the typical diet, multiple recalls to intake, cost and administration time; participant burden, have to recall to reliably estimate usual intake.