14. from left to right across a period, what change is occurring within the atomic nuclei?
a.
b.
c.
d
a proton is gained.
an electron is gained.
a neutron is lost.
the electron cloud size is decreasing.
Answers
Answer:
A.) a proton is gained
Explanation:
A.) is correct. Protons are located in an atom's nucleus. As you travel to the right on a period, the elements are gaining more protons. For instance, magnesium, which is one space to the right of sodium, has one more proton than sodium.
B.) is incorrect. Like protons, as you travel to the right across a period, each element gains another electron. However, while the statement itself is true, electrons are not located in an atom's nucleus.
C.) is incorrect. Like protons, as you go across a period, the number of neutrons in the nucleus increases, not decreases.
D.) is incorrect. As noted in B.), the number of electrons in each element increases across the period. Therefore, as more electrons surround the nucleus, the electron cloud size increases.
Related Questions
Which of the following statements is false?
a) Ionic compounds are brittle because the atoms are in a crystalline arrangement
B)Ionic compounds are brittle because if ions are shifted like charged ions will repel
C) Metals are malleable when the atoms can slide past one another
d)Metals can be bent because their free flowing electrons can rearrange and still hold the atoms together
im pretty sure its A, but not positive, can someone explain?
Answers
Answer:
a is write
Explanation:
Why are all ionic compounds crystalline in structure?
Ionic compounds are generally hard, but brittle. ... The repulsive forces between like-charged ions cause the crystal to shatter. When an ionic crystal breaks, it tends to do so along smooth planes because of the regular arrangement of the ions.
what kind(s) of bonding takes place in naoh?
Answers
The combination of ionic bonding and polar covalent bonding in NaOH gives rise to its distinct chemical and physical properties.
In NaOH, sodium hydroxide, two types of bonding occur: ionic bonding and polar covalent bonding.
Ionic bonding is the primary type of bonding in NaOH. It involves the transfer of electrons from the metal atom (sodium, Na) to the non-metal atom (oxygen, O) and hydrogen (H). Sodium donates its outermost electron to the oxygen atom, resulting in the formation of a positively charged sodium ion (Na+) and a negatively charged hydroxide ion (OH-). The strong electrostatic attraction between these oppositely charged ions holds the compound together.
However, there is also a degree of polar covalent bonding within NaOH. The oxygen atom, being more electronegative than hydrogen, attracts electrons more strongly. As a result, the oxygen atom in the hydroxide ion (OH-) carries a partial negative charge, while the hydrogen atom carries a partial positive charge. This unequal sharing of electrons creates a polar covalent bond between the oxygen and hydrogen atoms within the hydroxide ion.
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Na-23 has 12 neutrons. What is it’s atomic number?
Answers
Answer:
11
Explanation:
Data obtained from the question include:
Mass number = 23
Neutron = 12
Atomic number =.?
Next, we shall determine the number of protons present in the element.
This can be achieved by doing the following:
Mass number = Proton + Neutron
Mass number = 23
Neutron = 12
Proton =...?
Mass number = Proton + Neutron
23 = Proton + 12
Collect like terms
Proton = 23 – 12
Proton = 11
The atomic number of an element is equal to the proton number.
Atomic number = proton number
Proton number = 11
Atomic number = proton = 11
Therefore, the atomic number is 11.
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a . Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a .
Answers
Answer:
1. suspencion
2.colloid
Explanation:
Answer:
Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a SUSPENSION.
Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.
Determine the number of moles of hydrogen atoms in each sample.
a. 0.0885 mol C4H10
b. 1.3 mol CH4
c. 2.4 mol C6H12
d. 1.87 mol C8H12
Answers
Answer: D
Explanation:
Determine the number of moles of hydrogen atoms in .0885 mol C4H10
Help please!!!!!!!!!! Both questions!!!!
Answers
on the second on its false.
Skepticism is important in this scenario because it would help him to learn from the investigations of his colleagues. Ask future questions related to the investigation. Communicate his results at a conference. Ensure that his conclusion is supported by evidence.
Answers
Answer:
hello your question is incomplete below is the missing part of the question
A biochemist performs an experiment to study the behavior of water molecules near proteins. He concludes that water molecules occur in groups of five in the presence of proteins.
answer : Ensure that his conclusion is supported by evidence.
Explanation:
Skepticism during the conduction of an experiment is an act/trait that a scientist possess that will make him/her repeat an experiment for the purpose of verifying the data gotten from the previous experiment
hence the answer to the question is to Ensure that his conclusion is supported by evidence.
How is the glucose level in the blood maintained? Which body system, organs, and hormones are used and what do they do?
Answers
Answer:
Explanation:
Insulin is an hormone used to regulate blood glucose, as it helps to maintain a balance. It allows for transport of glucose to organs such as liver.
The process of glucose regulation is a complex process. When food is eating glucose is absorbed into the bloodstream this happen from the gut and it raises the blood glucose level this causes insulin(hormone) to be released from the pancreas so glucose can move inside the cells and be used.
As glucose moves inside the cells, the glucose level inside the bloodstream returns to normal and insulin release slows down.
Glucose which is the main energy source used by cells is allowed to be taken up by muscles, liver and fat (adipose tissue) and use as a source of energy so they can function properly.
What Is the Acidity or pH of Milk?
Answers
Answer: 6.7 to 6.9
Explanation:
It is acidic because its pH ranges from 6.7 to 6.9. Lactic acid is the reason behind this. However, the specific pH value is less important to whether it is acid forming- or alkaline-forming.
Which grains cause acids to form?Acid-forming foods often contain highly processed grains, such as morning cereals, professionally produced baked goods, wheat products, and breads with a lot of yeast. When you desire more carbohydrate food in your diet, brown rice, oat, millet, quinoa, and buckwheat are excellent options.
What foods are the most acid-producing ones?Citrus fruit is the worst offenders. Since they have low pH values, they are acidic. Lemons, lemons, plums, grapes, grapefruits, and blueberries are the fruits with the highest acid content. Also high in acid are tomatoes, peaches, pineapples, oranges, and orange juice.
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What are pros and cons of hydrogen fuel cells?
Answers
Answer:
Pros: No vehicle emissions other than water vapor. Fuel economy equivalent to about twice that of gasoline vehicles. Hydrogen is abundant, and can be made from renewable energy. Cons: This space-age technology is expensive.
Answer:
The pros of hydrogen fuel cells are that they are very efficient, producing very little waste. They are also very stable, which makes them safe to use.
The cons of hydrogen fuel cells are that they can be expensive to produce and maintain, and they require a lot of energy to power them, meaning that they often aren't as efficient as they could be.
Despite these pros and cons, hydrogen fuel cells are still a very promising technology. With more research, attention, and development, they could be a powerful force in the fight against carbon emissions and global warming.
What are the two types of economic activity? Explain
Answers
Answer:
Economic activity: Activities that are related to the production and consumption of goods in return for money. The main motive is to earn money.
The economic activities are:
Primary activity: these are related to the extraction of natural resources.
Secondary activity: these are related to the processing of raw materials.
Tertiary activity: these are related to providing services.
Non-ferrous metal is NOT hardenable by heat treatment; it must
gain strength through a process such as tempering. Is this
statement TRUE or FALSE?
Group of answer choices
True
False
Answers
The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.
Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.
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Why a steel ball sinks in water but floats on mercury
Answers
Answer:
Mercury is a thick substance and able to sustain and hold anything with any metallics with metal, such as with water it is not working as water is a thin substance and not able to hold heavy things
Explanation:
22. What is the difference between lodine-130 and lodine-131?
Answers
The first radioiodine isotopes to be used to treat thyrotoxicosis were iodine-130 and iodine-131 in 1941, and thyroid cancer was added to their list of uses in 1943.
What is Reactor produced radioiodine?Iodine-131, the most frequently prescribed radioiodine isotope for treating thyroid conditions, is a radioactive created in reactors and is widely available in the market. Uranium-235 isotope fission and the so-called (n, ) reaction are its two primary production processes.Iodine-131 is a radioisotope that is simple to obtain in pure form as its chain yield is quite high and radioiodine isotopes with masses higher than 131 have a short half-life. Contrarily, Technetium-130 undergoes a reaction with (n, ) to produce Technetium-131m and Technetium-131g. Depending on whether a wet chemical separation or a dry distillation process is employed, TeO2 or Te-metal is the target material for irradiation.Iodine-131 has a high radiochemical purity and is marketed as a diluted sodium hydroxide solution. When using iodine-131 to identify organic molecules, it may interfere if a certain reducing agent is used to preserve the isotope in the form of iodide in certain solutions.Another radioisotope created in reactors is iodine-125, which is formed when Xenon-124 undergoes the (n, ) reaction. High chemical and radiochemical purity iodine-125 is marketed as a diluted sodium hydroxide solution. It contains 4 to 11 GBq/ml of radioactive material.To Learn more About radioiodine refer to:
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PLEASE HELP ME ASAP!!!
Answers
Answer:
yes it is balanced equation
hope it helps
and your day will be full of happiness
3 things to say when your girlfriend is sad?
Answers
Answer:
don't be sad you have a nice peach
babe you got that wap
don't be sad go get a tattoo
Answer:
Netflix and chill | do you need d!c rn ? | spoil her
Explanation:
Which of these is an example of how engineers have contributed to society?
A. Our current understanding of viruses
B. Nomadic tribes traveling in search of food to hunt and gather
C. The theoretical mathematics describing the orbits of planets
around the sun
D. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
Answers
An example of how engineers have contributed to society is option D. The seven-mile bridge that spans across the Gulf of Mexico to connect two cities of the Florida Keys.
It is an example of how engineers have contributed to society. Engineers played a crucial role in designing, planning, and constructing the bridge, which provides an essential transportation link between the two cities.
The bridge enables efficient and safe travel, connecting communities, promoting economic development, and improving accessibility for residents and visitors. Engineering expertise is necessary to address various challenges such as designing a structure capable of withstanding environmental conditions, ensuring structural integrity, and incorporating appropriate safety measures.
This example showcases how engineers contribute to society by creating infrastructure that enhances connectivity and supports the growth and well-being of communities. The correct answer is option d.
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Calculate the wavelengths of the following objects:
Part 1 (1 point)
See Periodic Table See Hint
a muon (a subatomic particle with a mass of 1.884 x 10-25 g) traveling at 340.0 m/s
nm
Part 2 (1 point)
an electron (me = 9.10939 x 10-28 g) moving at 4.15 x 106 m/s in an electron microscope
nm
Part 3 (1 point)
an 82.0 kg athlete running a "4-minute mile" (i.e. 4.00 min/mile)
x 10-25
nm
Part 4 (1 point)
Earth (mass = 6.00 x 10278) moving through space at 3.20 x 10m/s
x 10
nm
Answers
A list of the calorie content of foods indicates that a 10 oz chocolate shake contains 353 Calories. Express this value in Joules. (1 Calorie = 1000 calories; 1 calorie = 4.18 Joules)a. 84.4 J b. 84,400 J c. 148 J d. 1480 J e. 1480,000 J
Answers
A list of the calorie content of foods indicates that a 10 oz chocolate shake contains 353 Calories in Joules will be 14,80,000 J
To convert the calorie content from Calories to Joules, we need to multiply the value by the conversion factor.
One calorie is equal to 4.18 Joules. Therefore, one Calorie is equal to
4.18 x 1000 = 4180 Joules.
The 10 oz chocolate shake contains 353 Calories.
Thus, the energy content of the chocolate shake in Joules can be calculated as:
353 Calories x 4180 Joules/Calorie = 1,476,140 Joules
Therefore, the answer is e. 1,480,000 J (rounded to the nearest thousand).
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L. Complete this nuclear equation for the alpha decay of Uus-294 by writing a
notation for the missing product:
Answers
The nuclear equation for the alpha decay of Uus-294 is
\(^{294}{117} Uus\) →\(^{4}{2}He + ^{290}_{115}Mc\)
To complete the nuclear equation for the alpha decay of Uus-294, we need to determine the missing product.
During alpha decay, the emission of an alpha particle, composed of two protons and two neutrons, leads to the formation of a new nucleus.
The balanced nuclear equation for the alpha decay of Uus-294 can be represented as follows:
\(^{294}{117} Uus\) → \(^{4}{2}He +\)_____(missing product)
In this equation, the atomic number of the missing product must be two less than the atomic number of Uus-294 (117 - 2 = 115), and the mass number of the missing product must be four less than the mass number of Uus-294 (294 - 4 = 290).
Based on this information, the missing product can be identified as:
\(^{290}_{115}Mc\)
Mc stands for Moscovium, which has an atomic number of 115. By subtracting two from the atomic number of Uus, we obtain the atomic number of Mc. The mass number of Mc-290 is obtained by subtracting four from the mass number of Uus-294.
Therefore, the nuclear equation for the alpha decay of Uus-294 is:
\(^{294}{117} Uus\)→ \(^{4}{2}He + ^{290}_{115}Mc\)
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The complete question is :
Complete this nuclear equation for the alpha decay of Uus-294 by writing a
notation for the missing product:
\(^{204} {117} Uns\)→\(^{4} _{2} He +\)_____
How much heat is released when the temperature of 60g water decreases from 75 Celsius to 27 Celsius?
Answers
Answer:
The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state or phase change. Sensible heat is measured by the expression:
Q = c * m * ΔT
Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.
In this case:
Q= ?c= 4.184 \(\frac{J}{g*C}\)m= 60 gΔT= Tfinal - Tinitial= 27 C - 75 C= - 48 CReplacing:
Q= 4.184 \(\frac{J}{g*C}\) *60 g* (-48 C)
Q= -12,049.92 J
The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.
Which number is different for isotopes of the same element?
A number of electrons
B number of full shells
C number of nucleons
D number of protons
Answers
Answer:
D number of protons or atomic mass
it is option c
no of nucleons
Which describes the molecule shown below?
O A. Unsaturated alkyne
O B. Saturated alkane
O C. Saturated alkene
O D. Unsaturated alkane
Answers
The description of the molecules shown is it is unsaturated alkynes. The correct option is A.
What are unsaturated alkynes?Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.
The pie bond shows that the hydrogen atoms are lost from the alkanes.
Thus, the correct option is A, unsaturated alkynes.
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The amount of energy needed to heat 2.2 g of a substance from 50.0°C to 80.0°C is 11.8 J. What is the specific heat capacity of this sample?
Answers
The quantity of heat energy needed to raise the temperature of \(1\)gram of a substance by \(1\) degree Celsius is known as the substance's specific heat capacity. This material has a specific heat capacity of about \(0.180 J/(g^\circ C).\)
What bis the heat capacity?To determine the substance's specific heat capacity,
\(q = m \times c \times \delta T\)
where m denotes the substance's mass, c denotes its specific heat capacity, and T is the temperature change. Here, q denotes the amount of heat that is communicated.
The mass of the substance \((m = 2.2 g),\) the temperature change \((T = 80.0°C - 50.0°C = 30.0°C),\) and the heat energy communicated (q = 11.8 J) are all given in this problem.
When the formula contains these values,
\(11.8 J = 2.2 g \times c \times 30.0^\Circ\)
Solving for c, we get:
\(c = 11.8 J / (2.2 g \times 30.0°C)\)
\(c ≈ 0.180 J/(g°C)\)
Therefore, This material has a specific heat capacity of about \(0.180 J/(g^\circ C).\)
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What is the molarity if 1.3 moles of C6H1206 is dissolved in 3.2 L of water?
Answers
Answer:
0.40M
Explanation:
no of moles=molarity×volume of solution in litre
Which statement best explains why the compound H2O is not toxic to drink, but H202 is toxic to drink?
Can someone help me please, anyone?!!!
Answers
Answer:
Compounds change properties when the number of atoms changes
The statement best explains the compound H₂O is not toxic to drink, but H₂O₂ is toxic to drink is compounds change properties when the number of atoms changes. The correct option is C.
What are H₂O and H₂O₂?H₂O is the chemical formula of water. It is made up of joining hydrogen and oxygen. Water is an essential compound of life. It is present in three forms on the earth.
H₂O₂ is the chemical formula of hydrogen peroxide. It is more viscous than water, and it is used as an antiseptic and used in cleaning cut areas and wounds.
When the atoms are more added to a compound. It changes its property because it becomes a new and different compound. Water and hydrogen peroxide are different compounds.
Thus, the correct option is C. compounds change properties when the number of atoms changes.
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The amount of chemical that will dissolve in a solution increases exponentially as the temperature is increased. At 0∘ C,8 g of the chemical dissolves, and at 10∘ C,15 g dissolves. a. Write an equation to express the amount of chemical dissolved, y, in terms of temperature, L, in degrees Celsius. b. At what temperature will 17 g dissolve? a. The exponential equation is
Answers
The exponential equation is required to be written to express the amount of chemical dissolved, y, in terms of temperature, L, in degrees Celsius.
The equation can be represented as given below:
y = ae^(kL)Where y is the amount of chemical dissolved,L is the temperature in degrees Celsius,a and k are constants The equation can be used to find the values of constants a and k.Substituting the given values of temperature and the amount of chemical dissolved in the equation, we get8 = ae^(0k)15 = ae^(10k)Dividing the second equation by the first equation we get:
15/8 = e^(10k)(1)Taking natural logarithm on both sides, we get:ln(15/8) = 10k (2)Using equation (2), we can find the value of k and substitute it in any of the above two equations to find the value of a.k = ln(15/8) / 10 = 0.0562.Substituting the value of k in the second equation, we get:
15 = ae^(0.562 10)a = 1.76Substituting the value of a and k in the exponential equation y = 1.76e^(0.0562L).Therefore, the exponential equation to express the amount of chemical dissolved, y, in terms of temperature, L, in degrees Celsius is y = 1.76e^(0.0562L).
Now, we are required to find out the temperature at which 17 g of the chemical will dissolve. Using the above equation, we can find out the value of L as follows:
17 = 1.76e^(0.0562L)Dividing by 1.76 on both sides 9.659 = e^(0.0562L)Taking natural logarithm on both sides ln(9.659) = 0.0562LTherefore,L = ln(9.659) / 0.0562L = 27.15 degrees CelsiusTherefore, the temperature at which 17 g of the chemical will dissolve is 27.15 degrees Celsius.About TemperatureTemperature shows the degree or size of the heat of an object. Simply put, the higher the temperature of an object, the hotter it is. Microscopically, temperature shows the energy possessed by an object. What is the use of temperature? Temperature or temperature is a quantity used to determine whether an object is hot or cold.
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How many moles ar Li are in 9.53x^24 atoms of Li?
Answers
Answer: 15.83 mol
Explanation:
To convert from atoms to moles, we will need to use Avogadro's number.
Avogardo's number: 6.022×10²³ atoms/mol
\(9.53*10^{24} atoms*\frac{1mol}{6.022*10^2^3 atoms} =15.83 mol\)
Now, we know that there are 15.83 moles.
in the liquid state hydrogen is used as a fuel in
Answers
Answer:
Space Technology
Explanation:
The chemical equation below represents an unbalanced chemical reaction:
Fe + 0, → Fe,o,
When the equation is balanced, what coefficient is needed for Fe2O3?
A
1
B
2
С
3
D
4
Answers
Answer:
2
Explanation: