Answer:
Alpha decay
Explanation:
₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴ + energy
Properties of alpha radiation:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
Homework help :)
Give an example where the following energy changes would take place:
Electric to Thermal
Chemical to Thermal
Electric to Mechanical
1. A toaster draws electric current (electrical energy) from a wall outlet and converts these moving electric charges into heat (thermal energy) in the filaments that turn red hot to cook your toast.
Examples of Chemical Energy to Thermal Energy:2. Coal is burned at a power plant. The chemical energy released as the coal is burned heats water and turns it into steam. The chemical energy causes the liquid water molecules to move faster increasing their thermal energy.
In an experiment using a calorimeter, the following data were obtained: what is the total number of joules absorbed by the water?
A.) 1,000
B.) 1,500
C.) 6,300
D.) 4,500
Which conclusion is best supported by Julie’s observations?
A. The liquid is a pure substance because it is colorless.
B. The liquid is a mixture because its temperature rises.
C. The liquid is a pure substance because it remains liquid when cold.
D. The liquid is a mixture because it has a gas dissolved in a liquid.
How does the law of conservation of mass apply to this reaction: C2H4+3O2----> 2H2O+2CO2
A.Only the oxygen needs to be balanced
B. The equation needs to be balanced. There are fewer oxygen atoms in the equation than hydrogen and carbon
C.The law of conservation of mass has already been applied
D. Each element needs to be balanced
The answer is; C
There are 2 Carbons, 4 Hydrogens, and 6 oxygens on both sides
All the moles of the elements on the right of the reaction equation are balanced with those on the left of the equation. These moles are indicated by the number in front of the symbols of the elements. This ensures that the first law of thermodynamics is observed. This law states that no matter or energy can be destroyed or created; It can only be transformed.
Option C. The law of conservation of mass has already been applied, is the correct option
The question asks how the law of conservation of mass applies to the chemical reaction C₂H₄ + 3O₂ ---> 2H₂O + 2CO₂.
Law of Conservation of Mass This means that the number of each type of atom in the reactants must be equal to the number of each type of atom in the products.
Balancing the Equation
In the given reaction: C₂H₄ + 3O₂ ---> 2H₂O + 2CO₂, we need to ensure that each element is balanced on both sides of the equation.
Since the number of atoms for each element is the same on both sides of the equation, the law of conservation of mass has been applied, and the equation is balanced.
Therefore, the correct answer is C .The law of conservation of mass has already been applied.
what is the name of the compound that has the formula Li2SO3?
a. lithium sulfite
b. lithium sulfate
c. bilithium trisulfate
d. bilithium trisulfide
The name of the compound that has the formula Li₂SO₃ is lithium sulfite, it is an ionic compound, hence option A is correct.
Although lithium sulfate doesn't often increase in solubility with temperature like other salts do, it is soluble in water. Instead, because its dissolution is an exothermic process, its solubility in water declines as temperature rises.
It is simple to hydrolyze and absorb water vapor from the air, which releases gaseous hydrogen sulphide, which is extremely hazardous.
Lithium sulfite easily to dissolve in water, ethanol, acid, and base; difficult to dissolve in alkali.
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the formula for sodium sulfide is Na2S. explain what this formula means.
When metals and non metals combine in fixed proportion then a chemical compound is formed. The given Formula represents 2 sodium (Na) atoms and one sulfur (S) atom.
What is chemical formula?Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral.
The formula for sodium sulfide Na₂S means 2 sodium (Na) atoms and one sulfur (S) atom are there. 2 sodium (Na) atoms and one sulfur (S) atom combine to form Na₂S.
Therefore, formula represents 2 sodium (Na) atoms and one sulfur (S) atom.
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Which of these are examples of complex patterns of inheritance? Options:
1. light exposure affecting wing color in birds
2. a trait, such as height, being determined by at least four genes
3. a single gene mutation affecting a person’s speech, body strength, and weight
4. three alleles that can determined wing color
5. all of the above
Complex patterns of inheritance include traits affected by environmental factors, polygenic inheritance where traits are controlled by multiple genes, single gene mutations impacting multiple traits, and the presence of multiple alleles for a single trait.
Explanation:The examples of complex patterns of inheritance include:
Light exposure affecting wing color in birds.Polygenic inheritance, such as height being determined by at least four genes.A single gene mutation affecting a person’s speech, body strength, and weight.Three alleles that can determine wing color.All of the above.Polygenic inheritance refers to a trait that is controlled by more than one gene. In humans, traits like skin color, height, and weight are examples of polygenic characteristics. This type of inheritance can result in many possible phenotypes. Additionally, the phenomenon of multiple alleles exists when more than two alleles are present in a population, such as the ABO blood type alleles (IA, IB, and i).
Overall, complex inheritance patterns involve the interaction of multiple genes, the presence of multiple alleles within a population, and can also be influenced by environmental aspects.
The carbohydrates seen here contains 3 common elements.They are....
A) carbon,hydrogen,and oxygen
B) oxygen,nitrogen,and sulfur
C) hydrogen,oxygen,and nitrogen
D)carbon dioxide, hydrogen,and phosphorus
3. Give three examples of how microorganisms might demonstrate the characteristics of life
PLease help me i will give brianlist i am siooo desperte please
Answer:
they grow, reproduce and die.
Explanation:
Microorganisms are a way of life that cannot be visualized without the aid of a microscope. These tiny beings can be found in the air, on the ground, and even in man. These tiny beings are not all the same, they can be very different in size and way of life. However, they all have in common a very simple structure and the impossibility of being seen without the use of a microscope. In addition, microorganisms can represent some characteristics of life, since as well as living beings in gereal they grow, reproduce and die.
In your own words, what is homeostasis?
Answer:
homeostasis is the stabilizing of an organism's internal condition
how many electrons are present if a bromine ion has a charge of -1
magnesium chloride is an example of an ionic compound, which is a compound composed of what?
What are the similarities and differences between heat and thermal energy? Need to know for quiz tomorrow:( PLEASE HELP!!!
Final answer:
Heat is the transfer of thermal energy between objects, while thermal energy is the total kinetic energy of all particles in an object. Heat causes a change in temperature, while thermal energy affects the overall temperature of an object.
Explanation:
Differences between Heat and Thermal Energy:
1. Definition: Heat is the transfer of thermal energy from an object at a higher temperature to an object at a lower temperature. Thermal energy is the total kinetic energy of all the particles in an object.
2. Transfer: Heat can be transferred between objects, while thermal energy remains within an object.
3. Temperature Change: Heat transfer causes a change in temperature, while thermal energy affects the overall temperature of an object.
Similarities between Heat and Thermal Energy:
1. Units: Both heat and thermal energy are measured in Joules.
2. Related: Heat is a form of thermal energy and both are related to the movement of particles.
3. Conservation: Both heat and thermal energy obey the law of conservation of energy.
In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?
A) the boiling point of water
B) the boiling point of sugar
C) the identity of the black substance
D) temperature at which sugar evaporates
The boiling point of sugar is a must to determine if a chemical change has occurred or not. Thus, the correct option is B.
What is Chemical change?A chemical change is the change which occurs when one substance combines with the other substance in solution. For examples while heating the sugar, it reacts with the oxygen gas present in the environment.
If we dissolve sugar in a glass of water, we can evaporate the water to get back to the solid sugar in the vessel. This is a physical change called a phase transition. A phase change involves a change in the state or form of the new substance formed.
Sugar does not boil, but instead will get re-crystallized in the beaker at a much higher temperature of about 320°F. As the temperature keeps on increasing, the water in the beaker will reach its boiling point, and turn into steam in the process of evaporation. Meanwhile, the sugar in the solution will begin to re-crystallize in the bottom of the vessel.
Therefore, the correct option is B.
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A student weighs out 0.477 g of KHP (molar mass = 204.22 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton.
The molarity of NaOH solution is [tex]\boxed{{\text{0}}{\text{.0635 M}}}[/tex]
Further Explanation:
The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:
1. Molarity (M)
2. Molality (m)
3. Mole fraction (X)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M, and its unit is mol/L.
The formula to calculate the molarity of NaOH solution is as follows:
[tex]{\text{Molarity of NaOH solution}}=\frac{{{\text{amount}}\;\left({{\text{mol}}} \right)\;{\text{of}}\;{\text{NaOH}}}}{{\;{\text{volume }}\left({\text{L}}\right)\;{\text{of}}\;{\text{NaOH solution}}}}[/tex] ...... (1)
Firstly the volume is to be converted into L. The conversion factor for this is,
[tex]{\text{1 mL} ={\text{1}}{{\text{0}}^{{\text{-3}}}}{\text{ L}}[/tex]
So the volume of NaOH solution can be calculated as follows:
[tex]\begin{aligned}{\text{Volume of NaOH solution}}&=\left({{\text{36}}{\text{.78 mL}}}\right)\left({\frac{{{\text{1}}{{\text{0}}^{-3}}{\text{ L}}}}{{{\text{1 mL}}}}}\right)\\&=0.03678\;{\text{L}}\\\end{aligned}[/tex]
The number of moles of KHP can be calculated as follows:
[tex]{\text{Moles of KHP}} = \frac{{{\text{Given mass of KHP}}}}{{{\text{Molar mass of KHP}}}}[/tex] …… (2)
The given mass of KHP is 0.477 g.
The molar mass of KHP is 204.22 g/mol.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Moles of KHP}}&=\left({{\text{0}}{\text{.477 g}}}\right)\left({\frac{{{\text{1 mol}}}}{{{\text{204}}{\text{.22 g}}}}}\right)\\&={\text{0}}{\text{.0023357 mol}}\\\end{aligned}[/tex]
Since KHP is a monoprotic acid and NaOH is also monobasic. Therefore equal moles of KHP and that of NaOH will react and thus become equal. The moles of NaOH is 0.0023357 mol.
The moles of NaOH are 0.0023357 mol.
The volume of NaOH solution is 0.03678 L.
Substitute these values in equation (1).
[tex]\begin{aligned}{\text{Molarity of NaOH solution}}&=\frac{{{\text{0}}{\text{.0023357 mol}}}}{{{\text{0}}{\text{.03678 L}}}}\\&={\text{0}}{\text{.063504 M}}\\&\approx {\text{0}}{\text{.0635 M}}\\\end{aligned}[/tex]
So the molarity of NaOH solution is 0.0635 M.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: molarity, NaOH, KHP, monoprotic, amount of NaOH, molarity of NaOH solution, 0.003678 L, 36.78 mL, 0.0635 M, molarity of NaOH solution, 0.477 g and 204.22 g/mol.
The concentration of the stock NaOH solution is 0.0635 mol/L.
Given:
Molar mass of KHP = 204.22 g/mol
Mass of KHP used = 0.477 g
Number of moles of KHP = mass / molar mass
= 0.477 g / 204.22 g/mol
= 0.002336 mol
Since KHP is an acid with one acidic proton, it reacts with one mole of NaOH in a 1:1 ratio.
Therefore, the number of moles of NaOH used in the titration is also 0.002336 mol.
The volume of NaOH solution used = 36.78 mL
= 0.03678 L
The concentration of NaOH solution = number of moles/volume in liters
= 0.002336 mol / 0.03678 L
= 0.0635 mol/L
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Light that bounces off a surface is said to be
A. reflected
B. refracted
C. absorbed
D. radiated
Which factor impacts the possible number of ways in which different atoms can be put together?
Which mineral property can be determined simply by observation
Answer is: luster.
Luster is example of qualitative observations.
Qualitative observations are information about the quality of substances.
In qualitative observation, informations are collected using senses (sight, hearing, taste, smell and touch).
Qualitative observations are not measurable and cannot be recorded in terms of numbers.
Luster is the way light interacts with the surface of a mineral.
Other example is cleavage, the tendency of mineral to split along definite crystallographic structural planes.
According to the United Nations, how many people lack access to safe drinking water?
What are chicken nuggets made of
Give 20 points and brainliest, please answer quickly!!!
The idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth can best be explained by which of Steno's principles?
A. principle of superposition
B. principle of horizontality
C. principle of original lateral continuity
D. principle of faunal succession
(It didn't have science so I chose chemistry as the subject :/)
The idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth can best be explained by the principle of horizontality. Thus, the correct option for this question is B.
What do you mean by Steno's principle of horizontality?Steno's principle of horizontality may be defined as the process through which the succeeding layers of sediment and sedimentary rocks are significantly accumulated in an identical fashion in order to help geologists to understand different layers.
According to the context of this question, Steno's principles of horizontality determine the actual existence of sedimentary rocks with respect to time. Apart from this, it is also known as the law of original horizontality. It also describes the complete process of patterns in which rock layers are deposited.
Therefore, the principle of horizontality is explained by the idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth.
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You want to investigate how the color of light affects the growth of plants. The best resource for reliable scientific information to help you with your hypothesis would be a(n)
A. book on the species of plants grown in your area
B.magazine article on gardening
C.article documenting experiments with their results
D.website containing information about light sources
Answer: C.article documenting experiments with their results
Explanation:
An independent variable is the variable that can be changed or manipulated so as to determine the result of such change on the dependent or the experimental variable.
In the given study, the color of light is the independent variable the effect of which is to be determined over the plant growth which is the dependent variable.
The information related to this experiment can be observed on the article documenting the experiments similar experiment. This will have valid and reliable information.
What provides clues about how igneous rocks were formed? A color B Texture C Luster D Streaks
Which of the following is an example of velocity? Question 15 options: A plane travelling south towards the Bahamas. A man running 7 miles per hour west. A car sitting at a stop sign? A dog running at 5 miles per hour.
Answer is: A man running 7 miles per hour west.
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.
Answer: A man running 7 miles per hour west.
Explanation: Vector quantity is a quantity which has both magnitude and direction.
Scalar quantity is a quantity which has only magnitude.
Velocity is a vector quantity which expresses the speed of the body along with the direction in which it is moving.
[tex]v=\frac{distance}{time}=\frac{miles}{hour}[/tex]
Thus the correct option is A man running 7 miles per hour west.
the term Reuther Ford gave to the positively charged particles in the nucleus of an antom was
true or false: the part of photosynthesis that does not require light is the Calvin cycle
explain the process that forms a normal fault ad leads to an earthquake along the fault. Describe the fault, the type of stress that produces it, and events during the earthquake
Answer:
the plates move which causes an earthquake.
Explanation:
i learned about this.
Answer:
i have no clue
Explanation:
which two elements in the periodic table have the same number of electrons in their outer orbitals?
Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell?
Scandium
Cesium
Iodine
Xenon
Answer:
Cesium
It is the most reactive element on the periodic table.
Baking soda is mixed with water, and no bubbles are produced. When baking soda is mixed with vinegar, it bubbles and foams rapidly.
What chemical property of baking soda is shown in the scenario?
flammability
reactivity
boiling point
color change
Answer:
reactivity
Explanation: