16. Students in a chemistry course were asked the following question on a unit exam: "Draw a dia-
gram representing an element using circles as atoms."
a. The following diagrams represent two typical answers given by students. Which drawing is
the best representation of an element? Explain.
b. Imagine that the atom in Drawing B had been removed by physical separation from one
of the substances in Model 1. What substances could have been the source of the atom in
Drawing B?
Answers
If the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.
What is the source of the atom?An atom is the smallest part of a substance that can take part in a chemical reaction. We know that elements are composed of atoms. The atoms of an element are discretely arranged. Thus, in an element, there are so many atoms of the substance.
In the image that has been shown in the question, the source of the atom as it has been show is an element. Thus, if the atom in Drawing B had been removed by physical separation from one of the substances in Model 1, the substance that could have been the source of the atom in Drawing B is an element.
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Related Questions
Purchase process: (50) The process begins with a department admin sending a purchase request to the IT department. The IT Manager reviews the request and if approved, requests a quote from Apple, Dell, HP, ASUS and Lenovo. If rejected, the request is sent back to the admin for review and has to be resubmitted to the IT Manager. The best price will be sent to the admin and once approved, the IT manager finalizes the vendor and then prepares the purchase request. The Procurement Supervisor receives the request and issues the purchase order to the vendor. The Procurement Supervisor then reviews the invoice and processing time from the vendor. By the end of the processing time, if the tracking number was not received, the Supervisor cancels the order. If vendor provides the tracking number, Procurement Supervisor collects the product once delivered and simultaneously submits the payment. Once both the steps are done, the process ends as the purchase is completed.
Answers
The purchase process involves steps such as initiating a request, vendor selection, approval, purchase order issuance, product delivery, and payment, ensuring a systematic approach to procurement for accountability and efficiency.
The purchase process consists of several steps:
1. The department admin initiates the process by sending a purchase request to the IT department.
2. The IT Manager reviews the request and decides whether to approve or reject it.
3. If the request is approved, the IT Manager contacts various vendors, such as Apple, Dell, HP, ASUS, and Lenovo, to request quotes.
4. The IT Manager receives the quotes and selects the best price.
5. Once the best price is selected, the IT Manager informs the admin and waits for their approval.
6. If the admin approves, the IT Manager finalizes the vendor selection and prepares the purchase request.
7. The IT Manager then sends the purchase request to the Procurement Supervisor.
8. The Procurement Supervisor receives the request and issues a purchase order to the chosen vendor.
9. The Procurement Supervisor reviews the vendor's invoice and processing time.
10. If the processing time elapses and the tracking number has not been received, the Procurement Supervisor cancels the order.
11. If the vendor provides the tracking number within the processing time, the Procurement Supervisor collects the product once it is delivered.
12. At the same time, the Procurement Supervisor submits the payment to the vendor.
13. Once both steps are completed, the purchase process is considered finished, and the purchase is completed.
This process ensures that there is a clear and systematic approach to purchasing items, from the initial request to the final delivery and payment. Each step is important in maintaining accountability and efficiency in the procurement process.
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How much water is needed to make 7.2moles of glucose?\(6CO2 + 6H2O -\ \textgreater \ C6H12O6 + 6O2\)
Answers
Approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
The balanced equation provided is:
6CO2 + 6H2O -> C6H12O6 + 6O2
From the equation, we can see that for every 6 moles of water (H2O), 1 mole of glucose (C6H12O6) is produced. Therefore, we need to determine the amount of water required to produce 7.2 moles of glucose.
The mole ratio between water and glucose is 6:1. This means that for every 6 moles of water, we obtain 1 mole of glucose. To find the amount of water needed for 7.2 moles of glucose, we set up a proportion using the mole ratio:
(6 moles H2O / 1 mole glucose) = (x moles H2O / 7.2 moles glucose)
Solving for x, we can cross-multiply:
6 moles H2O * 7.2 moles glucose = x moles H2O * 1 mole glucose
43.2 moles H2O = x moles H2O
Therefore, we need 43.2 moles of water to produce 7.2 moles of glucose.
To convert moles of water to grams, we need to know the molar mass of water, which is approximately 18 g/mol. Using the molar mass, we can calculate the mass of water needed:
Mass of water = moles of water * molar mass of water
Mass of water = 43.2 moles * 18 g/mol
Mass of water = 777.6 g
Therefore, approximately 777.6 grams of water is needed to make 7.2 moles of glucose based on the balanced equation.
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how salty is the ocean
Answers
Answer:
very
Explanation:
really salty
Answer: 35 grams of dissolved salts in each liter
Explanation:
It is written as 35 ‰ The normal range of ocean salinity ranges between 33-37 grams per liter (33‰ - 37‰).
Enter the number of electrons in each energy level (shell) for each of the elements. If the energy level does not contain any electrons, enter a 0. It may help to refer to the periodic table. K: =1 =2 =3 =4
Answers
The element with the symbol "K" refers to potassium. To determine the number of electrons in each energy level (shell) for potassium, we can refer to the periodic table.
Potassium has an atomic number of 19, indicating that it has 19 electrons. The electron configuration of potassium is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. Based on this configuration, we can assign the number of electrons in each energy level as follows:
=1 (first energy level): 2 electrons
=2 (second energy level): 8 electrons
=3 (third energy level): 8 electrons
=4 (fourth energy level): 1 electron
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the amount of energy absorbed or released in the process of melting or freezing is the same per gram of substance.
Answers
"The amount of energy absorbed or released in the process of melting or freezing is the same per gram of substance" is true.
The amount of energy absorbed or released during the process of melting or freezing, known as the heat of fusion, is the same per gram of substance. This is a fundamental property of phase transitions. When a substance undergoes melting, it absorbs heat energy to break the intermolecular forces holding the particles together and transition from a solid to a liquid state. Conversely, during freezing, the substance releases the same amount of heat energy as it transitions from a liquid to a solid state, with the particles forming ordered arrangements and reestablishing intermolecular forces. Since the heat of fusion is a specific characteristic of a substance, it remains constant per gram of the substance, regardless of the quantity being melted or frozen.
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Describe the orbital diagram of an atom with eight electrons. Explain how this orbital diagram demonstrates Hund's rule.
Answers
The orbital diagram of the eight electron atom is shown in the image attached.
What is Hund's rule?The Hund's rule states that the electrons that are found in atom must be filled singly first before pairing can occur. In this case we are dealing with an atom that has a total of eight electrons.
In looking at the orbital diagram, we are going to observe that the five orbitals would first be filed then we would now start to pair the orbitals until we fill in all of the eight electrons as shown in the image attached.
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Answer:
We have an electron that has six electrons, and there are two electrons that singly occupy the 2p orbitals. According to Hund's rule, electrons arise singly in an atom before pairing occurs.
Explanation:
Where are the filings located?
Answers
Answer: Go access the EDGAR database, go to the SEC's web site - www.sec.gov - and find the section entitled "Filings and Forms (EDGAR)." Click on "Search for Company Filings." When you get to the screen entitled "Search EDGAR Database," click on "Companies and Other Filers."
At what temperature will 24.6 g Cl2 (g) exert a pressure of 652 mmHg when confined in a 8.5 1 L container?
Answers
The temperature at which 24.6 g of chlorine gas, Cl₂ will exert a pressure of 652 mmHg when confined in a 8.5 1 L container is -16 °C
How do I determine the temperature?We'll begin by obtaining the number of mole of chlorine gas, Cl₂ in the container. Details below:
Mass of chlorine gas, Cl₂ = 24.6 gMolar mass of chlorine gas, Cl₂ = 2 × 35.5 = 71 g/molMole of of chlorine gas, Cl₂ =?Mole = mass / molar mass
Mole of of chlorine gas, Cl₂ = 24.6 / 71
Mole of of chlorine gas, Cl₂ = 0.346 mole
Finally, we shall determine the temperature. This is shown below:
Pressure (P) = 652 mmHg = 652 / 760 = 0.858 atmVolume (V) = 8.51 L Mole of of chlorine gas, Cl₂ (n) = 0.346 moleGas constant (R) = 0.0821 atm.L/Kmol Temperature (T) =?PV = nRT
0.858 × 8.51 = 0.346 × 0.0821 × T
Divide both sides by (0.346 × 0.0821)
T = (0.858 × 8.51) / (0.346 × 0.0821)
T = 257 K
Subtract 273 to obtain answer in °C
T = 257 - 273
T = -16 °C
Thus, can conclude that the temperature is -16 °C
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An atom of which element has the greatest attraction for the electrons in a bond with a hydrogen atom
Answers
Answer: Fluorine
Explanation: There are many variables that can affect the strenght of attraction of the electrons in a chemical bond.
The most significant of them is the electronegativity: a meassure of the affinity an element has with the electrons . The higher the electronegativity, the stronger the attraction with electrons.
Brainliest pls Have a nice day
Choose the groups of molecules below in which all the molecules are all polar. 1) HF, CH3CI, H20 II) HF, H2O, N2 III) SIHCl3, O2, H20 IV) CCl4, HCI, NH3 V) HF, CH4,
Answers
The correct answer is group I) HF, CH3CI, H2O, where all the molecules are polar.
The group of molecules in which all the molecules are polar is:
I) HF, CH3CI, H2O
In this group, all three molecules have a significant difference in electronegativity between the atoms, resulting in a polar covalent bond. HF (hydrogen fluoride) is a polar molecule due to the electronegativity difference between hydrogen and fluorine. CH3CI (chloromethane) is also polar because of the electronegativity difference between carbon and chlorine.
H2O (water) is a well-known polar molecule due to the electronegativity difference between oxygen and hydrogen atoms.
The other groups listed (II, III, IV, V) contain at least one molecule that is not polar:
- II) N2 (nitrogen gas) is nonpolar as it consists of two nitrogen atoms with identical electronegativity.
- III) O2 (oxygen gas) is nonpolar for the same reason as N2, and SIHCl3 (silicon tetrachloride) is nonpolar due to its symmetrical tetrahedral shape.
- IV) CCl4 (carbon tetrachloride) is nonpolar due to its tetrahedral shape and symmetrical distribution of charge, while HCI (hydrogen chloride) is polar.
- V) HF is polar, but CH4 (methane) is nonpolar as it has a symmetrical tetrahedral shape with the same electronegativity for all atoms.
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One mole of ANY element contains the:
same mass as one mole of any other element
same number of atoms as one mole of any other element
same gram-formula-weight as one mole of any other element
both the first and second choices
Answers
Answer:
1)The molar mass of an atom is simply the mass of one mole of identical atoms. However, most of the chemical elements are found on earth not as one isotope but as a mixture of isotopes, so the atoms of one element do not all have the same mass.
2)Equally important is the fact that one mole of a substance has a mass in grams numerically equal to the formula weight of that substance. Thus, one mole of an element has a mass in grams equal to the atomic weight of that element and contains 6.02 X 1023 atoms of the element.
Answer:all thing will be moving around
What volume of hydrogen gas, in mL, is produced from 0.128 g Mg reacting with an excess of HCI at a pressure of 1.28 atm and a temperature of 312 K?
Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g)
Answers
Answer:
132 mL of hydrogen gas is produced.
Explanation:
0.128 g Mg * (1 mol Mg/24.31 g Mg) * (1 mol H2/1 mol Mg) = 0.00526 mol H2
P = 1.28 atm
V = ?
n = 0.00526 mol
R = 0.08206 L·atm/mol·K
T = 312 KV = nRT/P
V = (0.00526 mol)(0.08206 L·atm/mol·K)(312 K) / (1.28 atm)
V = 0.132 L = 132 mL
Molality is a way to express the concentration of a solution that represents the number of moles of
solute per kilogram of solvent. How does molality of a sucrose solution affect the freezing point of
the solution?
Answers
Answer:
45
Explanation:
lactic acid has a pka equal to 3.86. what fraction of total lactic acid will be dissociated to lactate at ph 7.00?
Answers
The lactic acid has a pka equal to 3.86. the fraction of total lactic acid will be dissociated to lactate at pH 7.0 is 1.3 × 10³.
given that :
pH = 7.0
the pka value for the lactic acid = 3.86
according to the Henderson hasselbalch we get :
pH = pka + log [ H] / [HA]
substituting all the values ,we get
pH = pka + log [ H] / [HA]
7 = 3.86 + log [ H] / [HA]
log [ H] / [HA] = 3.14
[ H] / [HA] = 10 ^ 3.14
[ H] / [HA] = 1380.3
[lactate]/ [lactic acid] = 1.3 × 10³
thus, the ratio of the [lactate]/ [lactic acid] = 1.3 × 10³
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How many moles of glucose, C6H12O6, are in a sample which weighs 75.5 g? (Hint: your answer needs to be less than the 1 mole b/c you're asked about the mole equivalent of 75.5g, which is less than 1 mole of glucose)
Answers
There are 0,419 moles of glucose in a sample that weights 75.5g.
To calculate the amount in moles of glucose in 75.5g, we first need the molar mass of this compound. To calculate that I'll be using the following atomic mass values:
C: 12
H: 1
O: 16
To calculate the molar mass, we multiply the number of atoms by the respective atomic mass:
(6 * 12) + (12 * 1) + (6 * 16) = 180 g/mol
Since the molar mass is 180 g/mol, we know that each mol has 180 g of glucose:
1 mol glucose ---------- 180g glucose
x --------------------------- 75.5g glucose
Solving for x, we have x = 0.419 moles of glucose
Balanced chemical equation for the combustion of biodiesel
Answers
Answer:
carbon dioxide + water+ energy+ soot+carbon monoxide
How many milliliters of 0. 250M NaOH is required to neutralize 30. 4mL of 0. 152M HCl?
Answers
Approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.
To determine the volume of 0.250 M NaOH required to neutralize 30.4 mL of 0.152 M HCl, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between NaOH and HCl:
NaOH + HCl -> NaCl + H2O
From the balanced equation, we can see that the stoichiometric ratio between NaOH and HCl is 1:1. This means that for every mole of NaOH, we require an equal number of moles of HCl to neutralize.
First, let's calculate the number of moles of HCl present in the given volume:
Moles of HCl = concentration of HCl * volume of HCl
= 0.152 M * 30.4 mL
= 4.6208 mmol (millimoles)
Since the stoichiometric ratio is 1:1, the number of moles of NaOH required to neutralize the HCl is also 4.6208 mmol.
Now, let's calculate the volume of 0.250 M NaOH needed to contain 4.6208 mmol:
Volume of NaOH = (moles of NaOH) / (concentration of NaOH)
= 4.6208 mmol / 0.250 M
= 18.4832 mL
Therefore, approximately 18.4832 mL of 0.250 M NaOH is required to neutralize 30.4 mL of 0.152 M HCl.
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You have 1684.6 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of solvent are in the solution?
Answers
Answer:
1623.62
Explanation:
The first step is to calculate the mass of sodium hypochlorite
1684.6× 3.62/100
1684.6× 0.0362
60.98252
Therefore the mass of the solvent can be calculated as follows
1684.6-60.98252
1623.62
1(c) Covert the units please
Answers
Answer:
7000000 milligrams
Formula:
multiply the mass value by 1e+6
How many moles of NH3 are produced in the reaction of 3.3 moles of N2?
N2 + 3H2 = 2NH3
Answers
Answer:
6.6 moles of NH3
Explanation:
3.3 mol N2 * (2 mol NH3/ 1 mol N2) = 6.6 mol NH3
explain all the 4 quantum numbers in detail
Answers
\(HELLO!\)
To completely describe an electron in an atom, four quantum numbers are needed:
Energy (n).Angular momentum (ℓ).Magnetic moment (mℓ).Spin (ms).\(MiraculousAlejandra\).
Weite the reaction of galactose with methanol and mineral acid ?
Answers
Answer: Here u go!
Explanation:
Glucose reacts with methanol in the presence of HCl and gives α and β glucoside. Glucoside formation is due to the reaction of alcohol with glucoside -OH group of glucose. β, D glucose is forms β, D-methyl glucoside. In the same way, fructose forms fructoside. 2. Oxidation Glucose when treated with bromine water, forms gluconic acid.
Hope this helps!
a large rainstorm hits your town and it rains all day. how does this event relate to the water cycle?
Answers
When a large rainstorm hits your town and it rains all day, is a stage of water cycle known as precipitation.
What is water cycle?
The water cycle shows the continuous movement of water within the Earth and atmosphere.
There are three main parts to the water cycle and they are listed below:
Evaporation, Condensation PrecipitationThe evaporation of water occurs when the water on earth surface such as lakes, rivers, ocean, etc, gains heat, turn into water vapour and escapes into the atmosphere.
The next stage after evaporation in water cycle is condensation, the warmer water vapour comes in contact with cooler air in the atmosphere or clouds, lose heat and form water droplets which accumulates in the cloud.
The last stage in the water cycle is precipitation; when the condensed water droplets in the cloud saturates the cloud, it precipitates in form of rain fall, and the process continues to infinite.
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How many orbitals correspond to each of the following designations?
(a) 3p;
(b) 4p;
(c) 4p
;
(d) 6d;
(e) 5d;
(f) 5f;
(g) n = 5;
(h) 7s.
Answers
(a) The designation 3p corresponds to one orbital.
(b) The designation 4p corresponds to three orbitals.
(c) The designation 4p corresponds to three orbitals.
(d) The designation 6d corresponds to five orbitals.
(e) The designation 5d corresponds to five orbitals.
(f) The designation 5f corresponds to seven orbitals.
(g) The designation n = 5 corresponds to 50 orbitals.
(h) The designation 7s corresponds to one orbital.
(a) The designation 3p corresponds to one orbital. In the p sublevel, there is a single set of three orbitals: px, py, and pz. The designation "3p" specifies that we are referring to the p orbital within the third energy level.
(b) The designation 4p corresponds to three orbitals. Similar to (a), the p sublevel has three orbitals: 4px, 4py, and 4pz. The "4p" designation indicates that we are referring to the p orbitals within the fourth energy level.
(c) It seems that there was a repetition of the 4p designation in your list. So, again, the 4p designation corresponds to three orbitals.
(d) The designation 6d corresponds to five orbitals. The d sublevel has five orbitals: 6dx^2-y^2, 6dz^2, 6dxy, 6dxz, and 6dyz. The "6d" designation indicates that we are referring to the d orbitals within the sixth energy level.
(e) The designation 5d corresponds to five orbitals. Similarly to (d), the d sublevel has five orbitals: 5dx^2-y^2, 5dz^2, 5dxy, 5dxz, and 5dyz.
(f) The designation 5f corresponds to seven orbitals. The f sublevel has seven orbitals: 5fz^3, 5fxz^2, 5fyz^2, 5fxyz, 5fx(x^2-y^2), 5fy(x^2-y^2), and 5f(x^2-3y^2).
(g) The designation "n = 5" represents all orbitals within the fifth energy level. The number of orbitals in a given energy level is determined by the formula 2n^2, where n is the principal quantum number. Therefore, for n = 5, there are 2 * 5^2 = 50 orbitals.
(h) The designation 7s corresponds to one orbital. The s sublevel contains a single orbital: 7s. The "7s" designation indicates that we are referring to the s orbital within the seventh energy level.
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Under conditions of extreme heat and pressure, sedimentary rock can transform into metamorphic rock. True or false?
Answers
Answer:
Sedimentary rocks like bituminous coal, limestone, and sandstone, given enough heat and pressure, can turn into nonfoliated metamorphic rocks like anthracite coal, marble, and quartzite. Nonfoliated rocks can also form by metamorphism, which happens when magma comes in contact with the surrounding rock
Explanation: THEREFORE I'D SAY TRUE!
WILL MARK BRAINLIEST
Answers
Answer:
B) inertia
Explanation:
Sorry if wrong
—
A- free fall is when an item falls freely
B- when an item remains still, unless it is forced
C- momentum is the quantity of motion of a making body
D- maximum velocity of an object
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The first location of chemical and mechanical digestion is the stomach. true/ false
Answers
The first location of chemical and mechanical digestion is the stomach. This statement is false.
Digestion is the breaking down of large insoluble food molecules into smaller water-soluble food molecules so that they can be absorbed into the aqueous plasma. In certain organisms, these small substances are absorbed from the small intestine into the bloodstream. Digestion is important for breaking down food into nutrients that the body uses for energy, growth, and cell repair that it needs to survive.
The digestive system has many forms. A basic distinction is made between internal and external digestion. External digestion evolved early in evolutionary history, and most fungi still rely on it. During this process, enzymes are secreted into the organism's environment, where organic substances are decomposed and some of the products diffuse back into the organism. Animals have a tube (alimentary canal) where internal digestion takes place. This is more efficient as more decomposition products can be trapped and the internal chemical environment can be more effectively controlled.
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When you get home, you smell cookies baking. You respond by walking toward the kitchen. Many signals move through your
nervous system in this process. Which component is involved first? (1 point)
O axons in your motor neurons
axons in your sensory neurons
Odendrites in your motor neurons
O dendrites in your sensory neurons
Answers
Answer:
dendrites in your sensory neurons
Explanation:
Sensory neurons are first activated, then the stimulus is transmitted horizontally between them, spreading perception through the olfactory bulb that captures the smell of a baked cookie.
After this, the axons are activated to transmit to the motor neurons that will carry out the action of walking towards the kitchen.
A student has a sample of aluminum with a mass of 27g and a volume of 10 cm3. What is the density of aluminum?
Answers
If you observe a Full Moon on January 12th, on what date would you observe the next New Moon?
Answers
January 19
Explanation:
every first 7 days of a month the moon roughly starts its full moon phase