Answer:
12 protons and 12 neutrons are present in Mg and
38 protons and 50 neutrons are present in Sr
Explanation:
Answer:
For ²⁴Mg
1. Proton number = 12
2. Neutron number = 12
For ⁸⁸Sr:
1. Proton number = 38
2. Neutron number = 50
Explanation:
For ²⁴Mg:
1. Determination of the number of proton.
The atomic number of an element is simply defined as the number protons in the atom of the element. The atomic number of ²⁴Mg is 12 since no two elements have the same atomic number.
Atomic number = 12
Proton number = Atomic number
Proton number = 12
2. Determination of the Neutron number.
Mass number = 24
Proton number = 12
Neutron number =?
Mass number = Proton + Neutron
24 = 12 + Neutron
Collect like terms
Neutron = 24 – 12
Neutron number = 12
For ⁸⁸Sr:
1. Determination of the number of proton.
The atomic number of ⁸⁸Sr is 38.
Atomic number = 38
Proton number = Atomic number
Proton number = 38
2. Determination of the Neutron number.
Mass number = 88
Proton number = 38
Neutron number =?
Mass number = Proton + Neutron
88 = 38 + Neutron
Collect like terms
Neutron = 88 – 38
Neutron number = 50
why can fluids flow but solids can’t?
Answer:
Fluids can flow because their molecular structure is different. Instead of being tightly packed, like a solid, there are fewer molecules per unit in a liquid than a solid. This gives the molecules of a liquid space to move around, and it flows because liquids take the shape of their container(s). These molecules usually tend to bump into each other and this causes the liquid to move as well
Answer:
Because the particles don't move, solids have a definite shape and volume, and can't flow. LIQUIDS - This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container.
Explanation:
hope this helps
help with this asap please
ΔH rxn = 434.7 kJ
Further explanationGiven
C+O₂⇒CO₂ ΔH=-393.5 (reaction 1)
2CO+O₂⇒2CO₂ ΔH=-566 (reaction 2)
2H₂O⇒2H₂+O₂ ΔH=483.6 (reaction 3)
Required
ΔH rxn
Solution
Reaction 1 : no change
C+O₂⇒CO₂ ΔH=-393.5
Reaction 2 : the reaction is reversed and divided by 2
CO₂⇒ CO+1/2O₂ ΔH=-283
Reaction 3 : divided by 2
H₂O⇒H₂+1/2O₂ ΔH=241.8
-------------------------------------------
C+H₂O⇒CO + H₂ ΔH rxn= -434.7 kJ
hi does anyone know what the answer to this is? i really need help
Answer:
The answer is
H. Met, Val, Lys, Arg, Gin, Ser
Explanation:
what is the mass of H2o required to dissolve 14.5g of glucose
if the molality of solution is 0.24 molal
Answer:
Mass of water = 0.33 Kg
Explanation:
Given data:
Mass of water = ?
Mass of glucose = 14.5 g
molality of solution = 0.24 m
Solution:
Number of moles of glucose:
Number of moles = mass/molar mass
Number of moles = 14.5 g/ 180.156 g/mol
Number of moles = 0.08 mol
Mass of water:
Molality = number of moles of solute / Kg of solvent
0.24 m = 0.08 mol / Kg of solvent
Kg of solvent = 0.08 mol / 0.24 m
Kg of solvent = 0.33 Kg
You are asked to get a compound that has a low melting point and cannot
conduct electricity, which would you pick if you saw three bottles labeled as LICI,
NaBr, and BrF. What type of bond did you get?
Answer:
the third
Explanation:
Scientists use the chemical and physical properties of matter to differentiate substances. Which of the following is a chemical property?
(A) A starch sample turns blue when introduced to iodine
(B) Gold's property of malleability allow it to be shaped into a ring.
(C) Salts exhibit electrical conductivity.
(D) A metal is identified by its density.
Answer:
a.) A starch sample turns blue when introduced to iodine
Explanation:
A is a chemical change whereas the other answers would be physical changes.
The chemical property has been the turning of the iodine blue with starch introduction. Thus, option A is correct.
The substance properties can be differentiated as Physical properties and chemical properties. Physical properties can be defined as the properties that do not lead to the change in the chemical composition of the compound, For example, electrical conductivity, malleability, density, etc.
The properties of the compound that have been led to the change in the chemical composition of the compound have been termed chemical properties. For example. burning, reduction, etc.
Since the starch sample has been reacted with iodine there has been a chemical change that leads to the product of blue color. Thus, the starch turning iodine blue has been the chemical property. Thus, option A is correct.
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Typhoons are large storms that form over the Pacific Ocean Hurricanes are large storms that form over the Atlantic Ocean. Which of the following are essential components in the formation of a hurricane
or a lyphoon
A High pressure, high temperature, cyclonic winds, dry air
B. High pressure cool temperature, strong winds, humid air
cWarm front, clouds, low pressure, high slevation
D Low pressure, warm temperature, warm ocean waters, spiraling winds
how does reducing the temperature of chemical reaction affect the rate at which it occurs?
Answer:
When you lower the temperature, the molecules are slower and collide less. That temperature drop lowers the rate of the reaction. When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions.
Explanation:
would u like to do a zoom?
If u can...
im just bored and my friend fell asleep on me :/
Temperature measures the average kinetic energy of particles of the substances. Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
What is temperature?Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.
Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.
When the temperature is reduced, the molecules move more slowly and collide less. The reaction's pace is slowed as the temperature drops. When the pressure is increased, the molecules have much less area to travel in. The number of collisions rises as the density of molecules increases.
Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
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Convert 6.21 km to m
If you leave your home at noon, and the speed limit is 50 km/h on the highway, what is the approximate time will you get to Atlantic City if Atlantic City is 150 km away? (obeying the speed limit of course)
Answer:
The time you will get to Atlantic City is 3 pm
Explanation:
Given;
speed limit, v = 50 km/h
distance to be traveled, d = 150km
The time of the motion is given as;
time = distance / speed
t = (150 km) / (50 km/h)
t = 3 hours
Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;
time to get home = 12 pm + 3hours = 3 pm
Therefore, the time you will get to Atlantic City is 3 pm
How do the physical and chemical properties of wood contribute to the function of the synthetic products made of wood?
Wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature.
What is wood?Wood is one of the most common and useful natural materials. It is the main tissue that supports and conducts nutrients in trees and other plants. Wood comes in a variety of colours & grain patterns and is produced by numerous botanical species, comprising both gymnosperms & angiosperms.
Its wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature. Unfavourable weather and unexpected temperatures will have an impact on the wood's strength. Among its attributes are mechanical, chemical, and physical qualities.
Therefore, wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time.
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What are some examples of HIGH resistance? Question 2 options:
long wire, wide wire, more resistors
wide wire, short wire, less resistors
long wire, narrow wire, more resistors
narrow wire, less resistors, long wire
(PLEASE HURRY! I NEED TO FINISH THIS QUIZ)
Answer:
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
Explanation:
longer wires have greater resistance. The longer the wire the greater the resistance.
The answer is Long wire, Narrow wire, more resistors
Evidence:
Help pls!
How can you use a chemical reaction to remove a contaminant from a solution?
Answer:
reverse osmosis
Explanation:
Water treatment is often complicated because it deals with the chemical makeup of the water, which varies widely. The first step is to determine what contaminants should be removed. Unfortunately, this is not always a straightforward process. Many contaminants make themselves known in obvious ways, such as iron or hydrogen sulfide, which can cause taste and odor issues. Other contaminants, such as arsenic or pesticides, are only uncovered through a sophisticated laboratory analysis.
It is important to test the water so that the right type of treatment system can be selected. Keep in mind, however, that more than one analysis may be necessary to get a baseline because water quality fluctuates. More information on possible contaminants in a specific area can be obtained by talking to residents, the local health department, the water department, or the state geological society. In addition, your laboratory should be able to recommend appropriate tests based on a customer’s concerns and the information provided about the water source. It is important not only to address customers’ concerns but also to educate them about potential contaminants they may not have considered.
Which of the following does not describe a physical property of iron?
A
Iron is silvery-white or gray in color.
B
Iron has a boiling point of about 3,000°C.
C
Iron is a magnetic element.
D
Iron and sulfur react to form iron sulfide.
Answer:
B
Explanation:
Iron becomes liquid when we heat it to a temperature of 1535° C this is it's melting point. If we further heat the liquid to 3,000° C it boils; iron is a gas above this temperature.
Explain the bond between Mg2C12 and also what type of bond will it be ionic or covalent?
What is the rise in sea level between 1930 and 2003?
A)
About 20cm
B)
About 16cm
C
About 12cm
Answer:
about 16
Explanation:
its 20 - ( approximately 5)
= approximately 16
Answer:
It should be (C) about 12cm
conditions for reaction of oxygen and copper
state the observation of the reaction
write the equation
About ______ impact the creators have been recognized on earth.
A) one thousand
B) 50
C)500
D)150
An apple, potato, and onion all taste the same if you eat them with your nose plugged
true or false
i know the answer do you?
Answer:
Ummm it would just be indistinguishable ..and i don’t think u well taste when u plug your nose so ldk but ig it is true let me know if am wrong
Explanation:
Please help I’ll give you guys brainiest!
Thank youuuuuuu :))
Answer:
in left direction
mark me as brainelist
Answer:
left
Explanation:
the force pulling the object is greater on the left than the right and therefore the object will be pulled to the left
What are the flocculation basins?
Answer:
The flocculation basin often has a number of compartments with decreasing mixing speeds as the water advances through the basin. ... This compartmentalized chamber allows increasingly larger floes to form without being broken apart by the mixing blades.
This table shows the pH values of different solutions. A 2-column table with 4 rows. The first column labeled solution has entries W, X, Y, Z. The second column labeled p H has entries 6, 5, 1, 3. Which ranks the solutions from the strongest to weakest acid? W X Y Z Y W X Z W X Z Y Y Z X W
Answer:
D- Y -Z -X -W
:)
The solution with lowest pH are more acidic and those with higher pH values are basic. The given solutions can be ranked from the strongest to weakest acid as Y Z X W.
What is pH?pH of a solution is the measure of its H+ ion concentration. Mathematically it is the negative logarithm of H+ ion concentration of the solution. The acidic solutions contains more H+ ions.
A pH value of 7 represents a neutral solution. The pH above 7 is basic solution and a solution with pH below 7 is acidic in nature. A pH scale can be used to measure the range.
The pH of 1 and 3 indicates strong acidic solutions and 5 and 6 are weakly acidic . The lowest value of pH indicates highest acidity. Therefore, the correct order is Y Z X W.
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PLEASE HELP
Fossil fuels are burnt in power plants to produce electricity. Which one of the
following sequences show the correct order of energy transformation?
Answer:
a
Explanation:
Chemical then thermal because the carbon emissions produce heat
Then kinetic because there is energy transfer then electric because that's the finished result
What's the Balance equation for:
_C4H10O +_ O2--->_CO2+_H20
Answer:
C₄H₁₀O + 6O₂ ⇒ 4CO₂ + 5H₂O
Explanation:
Match the amount of reactants and products on both sides of the equation.
In the Bronsted-Lowry model of acids and bases, an _____ is a hydrogen donor and a _____ is a hydrogen acceptor.
Answer:
According to Bronsted-lowry concept an acid is a hydrogen donnor and a base is a hydrogen acceptor.
Explanation:
Which of the following methods can be used to completely separate a solution containing alcohol and water?
A) Evaporation and distillation
B) Filtration
C)Floatation or centrifuge
D) Magnetism
The chemical formula for the ionic compound aluminum sulfite is Al2(SO3)3. Explain why there are 2 cations for every 3 anions in this compound.
Please help lol
Answer: It is a 2:3 ratio because Al has a +2 charge and S and O both have a -2 charge. It takes 2 Al to bring 3 SO3 to a neutral state.
Explanation:
Using principles of atomic structure, explain why the atomic radius of Te is less than the ionic radius of Te2− . Photoelectron spectroscopy data for the 1s sublevel of Te and the 1s sublevel of O are represented below. In terms of Coulomb's law and atomic structure, explain why the peak for O is positioned so far to the right of the peak for Te .
Answer:
See explanation
Explanation:
Let us recall that a negative ion is formed by addition of electrons to an atom. When electrons are added to the atom, greater interelectronic repulsion increases the size of the Te^2− hence it is greater in size than Te atom. Therefore, the ionic radius of Te^2− is greater than the atomic radius of Te.
In the second question, oxygen is positioned so far to the right because it has a far smaller nuclear charge compared to Te. Hence in the PES spectrum, the 1s sublevel of oxygen lies far to the right of that of Te.
Using principles of atomic structure, the reason why the atomic radius of Te is less than the ionic radius of Te²− is because of the Electrostatic force of repulsion between the negatively charged electrons of Te²- thereby causing the ion to be bigger than the neutral atom.
We must remember that negative ions are formed as a result of the addition of electrons to an atom.On this note, the electrostatic force of repulsion between the negatively charged electrons of Te²- ion becomes greater. Hence, the Te atomic radius is less than the ionic radius of the Te²- ion.By considering the second scenario, the element oxygen is positioned so far on the right because it has a very much smaller nuclear charge compared to Te.
As a result, in the PES spectrum, the 1s sublevel of oxygen lies far to the right of the 1s sublevel of Te.
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Nuclear fusion reactions release more energy than fission reactions while also generating less waste. However, nuclear fusion reactors are not currently used to generate electricity.
What is the main reason for this?
Nuclear fusion reactions release high energy and required tremendous temperature of nuclear reactors is the main reason for not used to generate electricity.
What are nuclear reactions?Nuclear reactions are those reactions which are taking place in the nucleus of any unstable atom and produces energy.
As in the question it is given that nuclear fusion reactions releases more energy and less wastage, but this energy are releases in the tremendous amount which can be proved harmful for the environment and the humans. To carry out this reaction we have to maintain the very high temperature of nuclear reactors of about 6 times greater than sun's temperature, which is not possible manually.
Hence, high temperature of nuclear reactors and high amount of energy released is the main reason.
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Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained
Answer:
They each have the same number of protons.
Explanation:
Full question: Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained. What is true about all uranium atoms?Answer:
They each have the same number of protons
Explanation:
All uranium isotopes have 92 protons in their nucleus. However, they differ in the number of neutrons in the nucleus, hence this also translates to varying mass numbers (which is the sum of neutrons and protons in the nucleus). The most common isotopes of uranium are; U-238, U-235, and U-234