Answer:
Electrons have a negative charge and are found in the area of an atom called Outer Shell
Electrons have a negative charge and are found in the area of an atom called electron shells.
investigations were carried out in a science lab to explore the topic of chemical and physical changes.
Investigation A
Step 1. Add 5 tsp. salt to 100 ml warm water and stir until most or all of the salt is no longer visible.
Step 2. Heat the salt solution on a burner until only a white solid remains.
Investigation B
Step 1. Mix 10 tsp. white sugar into 100 ml water and stir until most or all of the sugar is no longer visible.
Step 2. Heat the sugar solution on a burner until the solution thickens and turns brown.
In which step(s) did a chemical change most likely occur?
Investigation A, Step 1 and Investigation B, Step 1
Investigation A, Step 2 and Investigation B, Step 2
Investigation A, Step 2 only
Investigation B, Step 2 only
Investigation B, Step 2 only is the one in which a chemical change will most likely occur and is denoted as option D.
What is Chemical change?This is referred to as a type of reaction which is characterized by the formation of a new substance as a result of the synthesis or decomposition of a substance which is referred to as the reactant through various methods and techniques.
In the Investigation B, Step 2, the sugar solution is heated on a burner until the solution thickens and turns brown thereby forming caramel. The chemical change in this scenario is depicted as the caramel which is produced in the process known as caramelisation.
There is a new substance formed which is therefore the reason why option D was chosen as the most appropriate choice.
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Answer:
the answer is BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
Explanation: why? I don't know because I just piked a answer.
using periodic table write full electron configuration of bromine so that all subshells in each principle energy cell are grouped together
The atomic number 35 and symbol Br identify the chemical element bromine. The third-lightest halogen, it is a volatile reddish-brown liquid that easily evaporates to produce a vapour of a similar color. Its characteristics fall in between iodine and chlorine.
Bromine's electron configuration is [Br]4s^2.3d^10.4p^5
A maximum of two electrons can fit into a s subshell, six into a p subshell, ten into a d subshell, and fourteen into a f subshell.
The maximum number of electrons in a subshell and the number of orbitals may both be calculated using the angular momentum quantum number, l, which stands for various subshells. These quantities can be found using the formulas 2 ( 2 l + 1 ) and 2 l + 1 correspondingly.
The s subshell is represented by a l of 0, the p subshell by a l of 1, the d subshell by a l of 2, and the f subshell by a l of 3.
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30.00 g of a solid compound x contains 63.3% mn and 36.7% o by mass. when x is heated, 3.68 g of oxygen gas is evolved and a new solid compound y containing mn and o is formed.
The inorganic chemical with the formula MnO2 is manganese dioxide. Pyrolusite, a naturally occurring mineral and the primary manganese ore and component of manganese nodules, is this dark-brown to blackish solid.
Manganese is a chemical element with the atomic number 25 and the letter Mn in its name. In minerals, it is a hard, brittle, silvery metal that is frequently present next to iron. Manganese is a transition metal used mostly in the production of stainless steels and other industrial alloys.
Assume X weighs 100
Moles of Mn
= 54.94 /
63.3 (1 /54.94 ) = 1.51
Moles of O
= 16.00 /
36.7 (1 /16.00 ) = 2.29
the number of moles divided by the smallest (1.15 mol)
Mn O
1.15 /1.15 = 1.00
2.29 /1.15 = 1.99
Empirical Formula
MnO2
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Calculate the pH of 1 × 10-2 molar aqueous solution of H2SO4
The pH of a 1 × 10-² molar aqueous solution of H2SO4 is 2.
How to calculate pH?pH is the degree of acidity or alkalinity of a solution. The pH of a solution can be calculated by using the following formula;
pH = - log {H+}
According to this question, the concentration of 1 × 10-² molar aqueous solution of H2SO4. The pH of this solution can be calculated as follows:
pH = - log {0.01}
pH = 2
Therefore, the pH of the aqueous solution is 2.
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How might the world be different if all gases behaved ideally?
(Use photo to answer)
Gases are most ideal at high temperature and low pressure.
What are the differences between real and ideal gases when are the real gases most like ideal gases?Gases that are ideal and real. An perfect gas is also referred to as a point mass since its particles are so small, it has nearly no mass, and it has no volume.A theoretical gas known as an ideal gas is made up of several randomly moving particles without interparticle interactions. The converse is true for a genuine gas; its molecules interact and it takes up space. Due to this, PV is always equal to nRT.Because it links the amount of a gas (in terms of moles) to its pressure, volume, and temperature, the ideal gas law is the last and most usable statement of the gas laws. In chemical and engineering calculations involving gases, the ideal gas law is a vital tool.To learn more about : Ideal gas law
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chemistry 1.17 living by chemistry answers?
Answer:
Where's the actual question so we can help?
Explanation:
I don't see a question I can help with
Write a paragraph explaining the mechanism of a newton's cradle. Include which law the cradle represents and the forces acting upon it. Also, what are some factors that can prevent the cradle form working?
The Newton Cradle is device that could be used to explain the Newton third law of motion but its working could be hampered by friction.
What is the newton's cradle?We need to recall that Isaac Newton was a scientist whos research centered a lot around the reason for motion. In his studies, we can see that force is the reason for motion. As such, an object tends to move when the object have been acted upon by a system of unbalanced forces.
The Newton Cradle is a system that could be used indicate the principle of the conservation of linear momentum as we can see from the Newton third law. Recall that from the Newton third law; action and reaction are equal and opposite.
Having said this, we can see that the force that acts on one end of the sphere is transmitted across the spheres such that the last sphere across also moves upwards. The sphere could be prevented from working by friction.
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Question
What is the density of a substance that has the mass of 14.5 g and the volume of 8 mL? (D=m/v) will this object float or sink?
Answer:
Sink
Explanation:
Density is defined as the amount of substance per unit volume, and is given by the formula below:
Density= mass ÷volume
Given that mass and volume, calculate the density of the substance:
Density of substance
= 14.5 ÷8
= 1.8125 g/mL
Compare the density of the substance with that of the medium it is place in, for example water:
The density of water is 0.9998395 g/mL, thus the density of the substance is greater than that of water.
Since the substance is more dense than water, it will sink in water.
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When mass is "destroyed", what is released?
Mass can neither be created nor destroyed.
What is mass?Mass is described as the quantity of matter in a physical body. It can also be a measure of the body's inertia, the resistance to acceleration when a net force is applied.
The law of conservation of mass helps us to understand that mass can neither be created nor destroyed, although it may be rearranged in space, or the entities associated with it may be changed in form.
According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.
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An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. Which element - calcium or carbon is it likely to be?
Answer:
Calcium as carbon is insoluble in water
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Instant cold packs contain water and chemical called ammonium nitrate. When combined, the ammonium nitrate and water react to create a cold feeling. Is thermal energy absorbed or released during this chemical reaction? Explain
Answer:
Explanation: its cold, so energy is being released to try to reach equal temp with the outside area of the cold pack
20 points
Answer each of these the following three questions saying if the amount of energy is going up, down, or staying the same. Support your argument with evidence.
Since more of the daily solar energy is staying here on earth—
1-.how does this affect the amount of energy in the universe?
2-.How does this affect the amount of energy in the earth system (all of the parts of the earth put together?
3-. How does this affect the amount of energy in the atmosphere?
1. The total energy of the universe is zero.
2. Because each part of the Earth's system is interrelated, changes in one part can lead to changes in one or all other parts.
For example, when a volcano erupts, lava can flow to the surface and block nearby valleys.
This new obstacle affects the local drainage system by creating lakes and diverting rivers.
Volcanic ash and gases that can be released during eruptions can be blown high into the atmosphere and affect the amount of solar energy that can reach the surface. Temperatures across the hemisphere could drop as a result.
3. Solar radiation warms the atmosphere and is fundamental to atmospheric composition.
Atmospheric radiation is the flow of electromagnetic energy between the sun and the surface of the earth influenced by clouds aerosols and gases in the earth's atmosphere. This includes both solar radiation sunlight and longwave thermal radiation.
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Light of frequency 9.62 x 1014 Hz
(312 nm) strikes a surface of calcium
(Wo = 2.90 eV). How much kinetic
energy does the liberated electron
have in Joules?
The kinetic energy of the liberated electron is 1.73 x 10⁻¹⁹ J.
What is the energy of the light?
The total energy of the light is the sum of the kinetic energy of the electron and work function of the metal.
E = K.E + Ф
where;
K.E is the kinetic energy of the liberated electronФ is the work function of the metalThe total energy of the photons of light is calculated as follows;
E = hf
where;
f is the frequency of the lighth is Planck's constantE = (6.626 x 10⁻³⁴) x (9.62 x 10¹⁴)
E = 6.37 x 10⁻¹⁹ J
1 eV = 1.6 x 10⁻¹⁹ J
E = 6.37 x 10⁻¹⁹ J = 3.98 eV
The kinetic energy of the liberated electron is calculated as;
E = K.E + Ф
K.E = E - Ф
K.E = 3.98 eV - 2.9 eV
K.E = 1.08 eV = 1.73 x 10⁻¹⁹ J
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Light of frequency 3.62 x 1015 Hz
strikes a surface of copper
(Wo = 4.70 eV). How much kinetic
energy does the liberated electron
have in eV?
The kinetic energy that the liberated electron has in eV based on the given values is :
10.28 eV.
Explanation:1 eV is the kinetic energy gained by an electron or proton when acted upon by a 1 volt potential difference. E = QV is the formula for energy in terms of charge and potential difference.A photoelectron's maximum kinetic energy is given by
Emax = hf - W
where h is Plank's constant,f is the incident photon's frequency, andW denotes the metal surface's work function.here given,
f = 3.62 x 10¹⁵ Hz
W = 4.70 eV
by recalling the equation for a photoelectron's maximum kinetic energy with given values,
Emax = hf - W
= ((4.14 × 10⁻¹⁵eV.s)(3.62 x 10¹⁵ Hz)) - (4.70 eV)
= 10.28 eV
As a result, we discovered that the maximum kinetic energy of electrons is 10.28eV.
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Your are sailing along the coast of Australia. Explain why you won't be able to use Polaris to determine your latitude.
We won't be able to use Polaris to determine the latitude if we are present south of the equator because from the south we can't see the Polaris.
How we can determine latitude?We can determine latitude by measuring the angle of the North Star, which is called Polaris that is present above the horizon. There is no similarity to Polaris in the South, but to find your latitude if you are in the Southern hemisphere you can use a band, called the Southern cross and two stars called the Southern Pointers. Polaris cannot be seen from the south of the circuit. The altitude of a star is the estimation in degrees of the angle of the star above the horizon. which has an unusual name, the zenith. Polaris is used to determine the star is by no means the brightest star in the sky, and cannot help you determine longitude at all, as it is always on the meridian.
So we can conclude that Polaris is pointing directly toward the north pole there is no equivalent of Polaris in the South.
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timate the enthalpy of vaporization of water at 100°c from its value at 25°c ( 44.01 kj mol−1 ) given the constant-pressure heat capacities of 75.29 j k−1 mol−1 and 33.58 j k−1 mol−1 for liquid and gas, respectively.
vaporization's enthalpy is 40.88 kJ/mol.
What exactly is vaporization enthalpy?The amount of energy (enthalpy) required to turn a portion of a liquid into a gas is known as the enthalpy of vaporization (symbol Hvap), also known as the (latent) heat of vaporization or heat of evaporation.
Enthalpy of vaporization ∆Hvap
T1 = 25 + 273 = 298 K
T2 = 100 + 273 = 373 K
Cp(1) = 0.07529 kJ/K.mol
Cp(2) = 0.03358 kJ/K.mol
So dHvap at 100 oC would be,
dHvap = dHvap at 25 oC + (Cp(2) - Cp(1)(T2-T1)
= 44.01 + (0.03358 - 0.07529)(373-298)
= 40.88 kJ/mol
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what is the molar mass of NaBr with solution
Sodium bromide (NaBr) has a molar mass of 102.890 grams per mole.
Why is molar mass significant?The weight of one mole of a sample is referred to as the molar mass. Multiply the subscript (number of atoms) by the atomic mass of each component of the molecule to determine its molecular mass, and then add the masses of all the components together.
How can you calculate molar mass?We first obtain the atomic weights of the individual elements in a periodic table in order to calculate the molar mass of a molecule. Then, we multiply the total number of atoms by each one's atomic mass. The molar mass is obtained by combining all of the atomic masses.
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Based on the graph below, what is the most likely explanation for what happened halfway through year 15?
A graph with Years on the x-axis from 14 to 16 and Rabbits on the y-axis from 0 to 400, by hundreds. The line begins above 400, drops to 350 at year 14, increases above 400 and drops to below 350 at year 15, increases to over 400 and drops to 200 at year 16.
a.
a hot summer
b.
a harsh winter
c.
a sharp increase in available land
d.
a sharp decrease in available land
ANsWER is D
The most likely explanation for what happened halfway through year 15 is D. a sharp decrease in available land.
What is the most likely explanation for what happened?The term "population" refers to the average number of distinct residents in a particular area or region across time. They are individuals who are part of the same class of creatures. Halfway through year 15, the amount of land available begins to rapidly decline.
Beginning above 400, the line increases above 400 and declines below 350 at year 14, increases over 400 and rises to over 400 and drops to 200 at year 16, and so on.
Due to unfavorable weather and a lack of food, the number of rabbits drastically decreases during the cold winters and scorching summers. The population grows when the conditions are good, such as in the spring and summer, and the amount of land accessible shrinks as a result. As a result, there will be a dramatic drop in the amount of land that is available.
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How does the amount of energy in a wave relate to the amount of danger it poses to living things
The threat to living things increases with decreasing wavelength. While there are risks associated with longer wavelengths as well, live tissue is easily harmed by very short wavelengths like X-rays and gamma rays.
What impact do electromagnetic waves have on living things?The DNA within a living cell can be harmed by some types of electromagnetic radiation, which is radiation present in several types of light waves, including ultraviolet light as well as X-rays. Radiation-induced DNA damage can cause cell death or cancer.
Why are waves and high frequencies bad for living things?Higher-frequency waves have greater energy, and they come in a variety of wavelengths and frequencies. The atmosphere of Earth absorbs gamma rays that come from space. They can obliterate living cells, bring about mutations, and result in cancer. Ironically, gamma rays can be employed to treat cancer despite their lethal effects.
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BRAINLEST If I were to change the 4 (4H2O) in the above problem, to a 2, what would happen to the amount of hydrogen and oxygen present?
Answer:
i didn't understand the question properly but i think the answer will be that amount of hydrogen will decrease while amount of oxygen will be same
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you gently shake an amine, a carboxylic acid, and a phenol in a separatory funnel with ethyl acetate and aq naoh. which one of the following will be true?
The amine will remain in the upper organic (ethyl acetate) layer, while the phenol and the carboxylic acid will be in the lower aqueous layer. Effectively, a separation of amine will be achieved using basic extraction technique.
Sodium hydroxide (NaOH) makes a basic solution when dissolved in water. It will react with the acidic components of the analyzed mixture during extraction. Amine is also basic, so it will not interact with sodium hydroxide and will remain in the organic layer. Carboxylic acid is, as the name implies, acidic, and thus will be neutralized by sodium hydroxide, forming a water-soluble sodium carboxylate salt, which means that it will be removed from the organic layer. Phenol is also acidic enough to be neutralized by sodium hydroxide, so it will also form a water-soluble salt (sodium phenoxide) and be removed from the organic layer.
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The solubility of a substance at varying temperatures is listed:
1.1 g solute per 100 g solution at 20oC
0.8 g of solute per 100 g solution at 30oC
0.4 g of solute per 100 g solution at 40oC
Based on the data, what can you infer about this solute?
A) The solute is a gas.
B) The solute is a solid.
C) The solute is a liquid.
D) The solute is concentrated.
The substance is a gas because its solubility decreases with temperature.
What is a solution?A solution is formed when a solute is dissolved in a solvent. We know that the solubility has to do with how much of the solute in mass or moles that is able to be dissolved in the solvent at a given temperature. This shows that the temperature is very important when we are looking at solubility.
The solubility of a gas gets lesser and lesser as the temperature of the system increases and this is what we are seeing in the data that is shown in the question above.
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a 1.631 g sample of an unknown triprotic acid was dissolved in water and diluted to 250.0 ml in a volumetric flask. 20.00 ml of the acid solution required 19.74 ml of 0.1063 m naoh to reach the endpoint of the titration. determine the molar mass of the triprotic acid
The molar mass of the triprotic acid used is 186.4 g/mol.
To calculate the amount of triprotic acid, we must first calculate the number of moles (n) of sodium hydroxide (NaOH) expended during the titration. To do this, we can use its molarity (c = 0.1063 M) and volume (V = 19.74 mL = 0.01974 L):
c = n/V ⇒ n = c*V
n(NaOH) = 0.1063 M * 0.01974 L
n(NaOH) = 0.0021 mol
Because 1 mol of a triprotic acid requires 3 moles of sodium hydroxide to be neutralized, the amount of the acid in the 20.00 mL sample will be:
n(acid) = n(NaOH) / 3
n(acid) = 0.0021 mol / 3
n(acid) = 0.0007 mol
Now we use a proportion to calculate the amount of acid present in a 250.0 mL sample:
0.0007 mol : 20.00 mL = X : 250 mL
X = 0.0007 mol * 250.0 mL / 20.00 mL
X = 0.00875 mol
Finally, we use the mass (m) and the number of moles to calculate the molar mass (M):
n = m/M ⇒ M = m/n
M = 1.631 g / 0.00875 mol
M = 186.4 g/mol
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Which of the following shows the correctly balanced chemical reaction [tex]H_{2}SO_{4}[/tex] reacting with HI?
The correctly balanced chemical reaction of [tex]H_2SO_4[/tex] with HI is [tex]H_2SO_4 + 8HI -- > H_2S + 4I_2 + 4H_2O[/tex]
Balancing chemical equationsThe equation of chemically balanced reactions must obey the law of conservation.
According to the law of conservation, the number of participating atoms in a reaction must be conserved. In other words, the number before must be the same as after the reaction.
However, the law opines that the forms of atoms may change after reactions.
Sulfuric acid reacts with hydrogen iodide to produce hydrogen sulfide, iodine molecules, and water according to the following equation:
[tex]H_2SO_4 + HI -- > H_2S + I_2 + H_2O[/tex]
However, the equation is yet to obey the law of conservation. The correctly balanced equation of the reaction would be: [tex]H_2SO_4 + 8HI -- > H_2S + 4I_2 + 4H_2O[/tex]
The above equation shows that the number of each atom in the reactants is the same as in the product.
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Which of the following shows the correctly balanced chemical reaction reacting with HI?
a. [tex]H_2SO_4 + 8HI -- > H_2S + 4I_2 + 4H_2O[/tex]
b. [tex]H_2SO_4 + 4HI -- > H_2S + 2I_2 + 2H_2O[/tex]
c. [tex]H_2SO_4 + HI -- > H_2S + I_2 + H_2O[/tex]
Example: The products of a chemical reaction are Sodium Hydroxide and Acetone.
Without knowing the reactants, how do you know that this is not a synthesis reaction?
The products of the chemical reaction are sodium hydroxide and acetone. This is because acetone undergoes aldol condensation. Synthetic reactions occur when two or more reactants combine to form a single product.
Sodium hydroxide is completely ionic and contains sodium and hydroxide ions. The hydroxide ion makes sodium hydroxide a strong base and reacts with acids to form the corresponding salts with water. The chemical formula for acetone is CH32CO. Also known as propanone or dimethyl ketone, it is the smallest and simplest ketone. It forms an iodoform when it reacts with iodine in the presence of NaOH. Thus it can be seen that iodoform is formed in the presence of NaOH.
Hydrochloric acid and caustic soda interact to form salts and release heat. As you can see table salt and water are the results of the interaction of two highly aggressive compounds. These compounds are ultimately harmless and even beneficial to humans. The reaction between benzaldehyde and acetophenone undergoes cross-aldol condensation in the presence of di-I. Sodium hydroxide. In this reaction, benzaldehyde has no alpha hydrogen.
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Base your answers to questions 1 and 2 on
the diagram below, which represents a solid material
of uniform composition.
2.0 cm
Density-2.7 g/cm³
-20 cm-
We
1. The mass of this piece of material is approximately
A) 32 g
Q4.4g
X) less
-3.0 cm
2. When this material is placed in a container of water, i
sinks to the bottom of the container. Compared to the
density of water, the density of this material is
B) greater
the same
B) 0.23 g
9.3 g
Answer:
A. 32 g
Explanation:
Density = 2.7 g/cm3
Volume = 2 x 2 x 3 = 12 cm3
Mass = dV = 2.7 x 12 = 32.4 g or 32 g
For each hydrogen ion concentration listed, calculate the solution as the concentration of hydroxide ion in the solution. Indicate whether each solution is acidic or basic.
(a) [H+] = 4.79*10^-8 M
? M
acidic
basic
neutral
(b) [H+] = 8.90*10^-3 M
?M
acidic
basic
neutral
(c) [H+] = 6.97*10^-5 M
?M
acidic
basic
neutral
(d) [H+] = 1.28*10^-12 M
? M
acidic
basic
neutral
Answer:
basic neural acid neural acid basic
A patient needs 50 mg of a medicine three times a day. If each tablet contains 25 mg of medicine the patient will need 20 tablets for a 4-day prescription.
Answer: The Rx should have been filled with 24 tablets, so it is false that the Rx was for 20 tablets
Explanation: 25mg x2 = 50mg x3 (three times a day). So patient takes 150mg day x 4 days= 6 tablets/day for 4 days. Rx should contain 24 tablets. If the pharmacy sent 20, the order wasn't calculated correctly.
ggggygyggyygygygygyggy
Answer:
ggggygyggyygygygygyggy
Explanation:
What's this for?
a solution is made by dissolving 52.0 g of sucrose, c12h22o11, in 117 g of water, producing a solution with a volume of 125 ml at 20°c. what is the expected osmotic pressure at 20°c?
The osmotic pressure is the least amount of pressure that must be applied to a solution in order to block the passage of the solution's pure solvent through a semipermeable membrane. Additionally, it is described as a measurement of a solution's propensity to osmotically absorb a pure solvent.
Temperature and concentration both have an impact on osmotic pressure. Temperature and solute concentration both have an impact on how much pressure is generated when water moves through a membrane. Osmotic pressure rises with temperature and concentration.
The osmotic pressure formula is
Op = C*R*T*i
where, Osmotic pressure is unknown, therefore OP
C = moles/liter of solution multiplied by the molarity of the solution.
Mass of sucrose or molar mass of sucrose equals a mole of sugar.
sucrose mass=52g
Sucrose's molar mass is 342g/mol (C12H22O11).
thus, 52/342 = 0.152 moles of sucrose.
Moles per liter of solution equals the solution's molarity.
117mL*1L/1000mL = 0.117L when converting from 117mL to liters where 1000mL = 1L
the solution's molarity is 0./0.117=1.299M.
R = 0.0821 L atm/mol/K, the universal gas constant.
20 degrees Celsius are converted to Kelvins using the formula T = absolute temperature = degrees in Kelvin. 20+273=293K
The van't Hoff Factor equals 1.
subsequently, the OP = 1.299*0.0821*293*1=31.24atm.
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