Why are plastic building blocks good for building molecules
Potassium chloride and silver acetate react to produce silver chloride and potassium acetate. Which reaction has occurred?
Answer:
double replacement reaction
Explanation:
Suppose you have 100 kg of fresh strawberries what would be the approximate mass of strawberries after you freeze dry them
The approximate mass of strawberries would be the same on freezing as according to the law of conservation of mass , mass can neither be created nor destroyed, it would only have change in density.
What is law of conservation of mass?
According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.
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Which element has the same number of energy levels as aluminum (Al) and the same number of valence electrons as calcium (Ca)? A. Beryllium B. Sodium C. Potassium D. Magnesium
Magnesium (Mg) shares the same number of energy levels as aluminum and the same number of valence electrons as calcium, making it the correct answer.
Explanation:The element that has the same number of energy levels as aluminum (Al) and the same number of valence electrons as calcium (Ca) is magnesium (Mg). Aluminum, with atomic number 13, has an electron configuration of [Ne]3s²3p¹, which means it has 3 energy levels. Calcium, with atomic number 20, has an electron configuration of [Ar]4s², which indicates it has 2 valence electrons. Looking at the options provided, we see that magnesium, which has an atomic number of 12 and an electron configuration of [Ne]3s², shares the same number of energy levels as aluminum (3 energy levels) and the same number of valence electrons as calcium (2 valence electrons).
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Which statements accurately describe density? Check all that apply.
Density is a derived unit of measurement.
Density is measured using only a balance or scale.
Density is measured with units such as grams.
Density is the ratio of mass to volume.
Density is a physical property of an object.
Explanation:
Density is the mass of an object or substance per unit volume. The symbol for density is [tex][/tex] and it can be calculated using the formula as follows.
[tex]\rho[/tex] = [tex]\frac{mass}{volume}[/tex]
Density is derived from mass which can be in grams or kilograms and volume which can be in liters etc. Therefore, density is a derived unit of measurement. We do not need any balance or scale to determine the density.
The statements in the options that accurately describe density are as follows.
Density is the ratio of mass to volume.Density is a physical property of an object. Density is a derived unit of measurement.The length of a copper wire is 1.6 centimeters (cm). What is the length of this wire in meters (m)?
Changes of state are a result of a change in the______of the matter.
Answer: -
Kinetic energy.
Explanation: -
Solids have the least kinetic energy and the highest intermolecular force of attraction among the three states of matter.
When heat energy is supplied to the solid, the kinetic energy of the solid particles increases. At some point, the kinetic energy becomes comparable to the intermolecular force of attraction. At that point solids change into liquids.
When further heat energy is given, at certain point the kinetic energy becomes far greater than the intermolecular forces of attraction. At that point it becomes gas.
Why are both absolute dating and relative dating used to determine the age of fossils?
PLEASE HELP FAST WILL MARK BRAINLIEST
Which element(s) is/are not balanced in this equation?
Pb(NO3)2 + 2KCl -> PbCl2 + KNO3
A.) K
B.) K, N, and O
C.) N amd O
D.) Pb, N, and O
(Even though you don't need the Periodic Table to figure this out, feel free to use it if you think it will help you)
Which statement is true about proper storage of flammable liquids? A. Store liquids in approval metal safety containers or original containers. B. Transfer liquids to plastic containers to enable more space on shelves. C. When not in use, containers should be open to allow release of vapor.
Answer: Option (A) is the correct answer.
Explanation:
A flammable liquid is a liquid which immediately catches fire when exposed to air, that is, flammable substances are combustible in nature.
Therefore, they need to be kept safely in a container with a lid that can prevent entrance for air. Hence, otherwise it would be unsafe to handle to liquid.
Thus, we can conclude that store liquids in approval metal safety containers or original containers.
PLEASE HELP IM GIVING A LOT OF POINTS! I'm losing a rank because of this!
1.Beatrice is pushing a heavy box. She pushes with a force of 40 N. How can you determine if Beatrice is doing work?
2. Beatrice pushes the box 2 meters to the right. What formula should you use to calculate the amount of work done on the box?
3. How much work does Beatrice do pushing the box?
THANK YOU FOR YOUR TIME!
1. since Beatrice is applying force to the box, she is doing work
2. formula is work = force x displacement
3. displacement = 2 meters, force = 40 N
work = 40 x 2 = 80 Joules
Answer:
1. since she is applying force to the box, she is doing work
2. formula of work = force x displacement
3. displacement = 2 meters, force = 40 N
work = 40 x 2 = 80 Joules
Explanation:
whats between -999 and 1000
in terms of newtons 3rd law of motion desribe this picture.
Newton's third law is: For every action, there is an equal and opposite reaction.
Newton's third law of motion declares that forces always come in action-reaction pairs; every action force has an equal and opposite reaction force. This principle explains the motion and equilibrium in every interaction between two objects, highlighting the intrinsic symmetry of forces in nature.
Explanation:Newton's third law of motion is a fundamental principle that provides insight into the interactions between two objects. The law states that for every action, or force, exerted by one object onto another, there is an equal and opposite reaction force. This means that whenever one body applies a force onto a second body, the first body will experience a force that is equal in magnitude but opposite in direction. This reciprocal action is what maintains the balance of forces in the universe.
For example, if you were to push against a wall, the wall pushes back against you with an equal force in the opposite direction. This is why you do not move the wall, and you feel the force of your own push being reflected back onto you. Another classic illustration is when two ice skaters push off against each other; both move in opposite directions due to the equal but opposing forces exerted.
In any interaction, no force exists alone; there are always action-reaction pairs. These forces are part of the same interaction and cannot be separated, reflecting a basic symmetry in nature. Newton's third law reveals the connectedness of forces and ensures that there is a constant state of motion or equilibrium in a system as long as external forces are balanced.
To which period does the Lanthanide series belong? Actinides?
The Lanthanide series belongs to the f-block of the periodic table, while the Actinide series belongs below the Lanthanide series in the f-block.
Explanation:The Lanthanide series belongs to the f-block of the periodic table and is located below the main body of the periodic table. It consists of the 15 elements from lanthanum (atomic number 57) to lutetium (atomic number 71). The Lanthanide series is also known as the rare earth elements.
The Actinide series, on the other hand, belongs to the f-block of the periodic table and is located below the Lanthanide series. It consists of the 15 elements from actinium (atomic number 89) to lawrencium (atomic number 103). The Actinide series is also known as the actinides.
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Solution A has twice as much solute as solution B is it possible for the solutions to have the same concentration
Which of these peices off evidence did Alfred Wegners original theory of continental drift have access to?
reversing paleomagnetism in rocks on the ocean floor
a seafloor that was geologically active with earthquakes, volcanoes, and mountain chains
seafloor spreading at mid-ocean ridges
mountains in North America appearing to match up with mountains in Northern Europe
The answer is A seafloor that was geologically active with earthquakes, volcanoes, and mountain chains.
since esters are cleaved on hydrolysis, the molecular weight of the acid derived from an ester is always lower than the molecules weight of the ester. however, esters are equally liquids while carboxylic acids are usually solids. suggest reasons for this observation and explain.
Answer:
Explanation:
Esters contains a double bond between carbon atom and oxygen atom while carboxylic acid lack double bond between carbon and oxygen atom.The lack of double bond in carboxylic acid make the force of interaction between carbon and oxygen strong and particles become tightly packed which make carboxylic acid solid. The presence of double bond in esters make the force of interaction weak thus they are liquid.
Sediment deposited where a river flows into an ocean or lake can build up a land form is called what?
Gretchen wants to run a test to discover whether glass, copper, wood, or plastic conduct electricity. She sets up a circuit connecting a battery to a light bulb, with a small gap she will use to test the conductivity of the different substances. One at a time, she connects the circuit with the chosen test material, and records whether or not the light bulb comes on. The variables in this experiment are
The plastic, wood, copper, and glass are the variables. The variables in an experiment are the things we can change and then test.
Complete the sentence. When a base is added to water, hydronium ions __________.
increase
decrease
stay the same
disappear
When a base is added to water, hydronium ions decrease
Explanation
When we add a base to the water, then the concentration of H⁺ ions is decrease.
What is base?According to the Arrhenius theory of acids and base, bases are those substances which gives hydroxide ions (OH⁻) to the solutions.
As we know that water (H₂O) molecules dissociates into hydronium ions (H⁺) ion and hydroxide ions (OH⁻). So when we add base in the water then this base gives hydroxide ion to the solution as a result of which concentration of OH⁻ ions increases in the solution and concentration of H⁺ ions decreases.
Hence, option (2) is correct i.e. decrease.
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Identify three factors that characterize aquatic systems.
Aquatic systems are characterized by abiotic factors, biodiversity, and water quality/chemistry. Each of these factors impacts the types of organisms that can survive in the environment and overall health of the system.
Explanation:Aquatic systems are characterized by three principal factors: abiotic factors, biodiversity, and water quality/chemistry.
Abiotic factors refer to the nonliving elements like sunlight, temperature, and salinity that directly affect the organisms living in these ecosystems. For example, in warmer temperatures, the water can hold less dissolved oxygen which can limit the types of species that can survive.
Biodiversity pertains to the variety of life forms present in the aquatic environment. It can range from microscopic organisms like phytoplankton to large mammals such as whales. The level of biodiversity often provides a measure of the health of the system.
Water quality/chemistry is extremely important in determining the types of organisms that can live in an aquatic habitat. Factors such as pH level, the amount of dissolved oxygen, nutrient content, and presence of pollutants all play an essential role.
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A mole is equal to 6.02 x 10²³, just like a dozen is equal to 12. So if you have a mole of carbon atoms, you have 6.02 x 10²³ carbon atoms. Likewise, if you have a dozen carbon atoms, you have 12 carbon atoms. The atomic mass on the periodic table is also known as the MOLAR MASS. The molar mass is the mass of 1 mole of the element. Therefore, 1 mole of carbon has a mass 12.01g/mole. How many atoms are in 5.2 grams of carbon? Please show your work. (This is a unit conversion problem.)
Use chemistry in a sentence not love chemistry science chemistry
Answer:
Pollution in our environment is actually changing the chemistry of large bodies of water.
Explanation:
Pls mark brainliest.
Answer:Chemistry is the branch of science that deals with the properties, composition, and structure of elements and compounds, how they can change, and the energy that is released or absorbed when they change.
Explanation: verified answer
50 pennies or other coins (all coins must be the same value)
If you do not have 50 pennies, you may cut 50 penny shaped pieces of paper and put an x on only one side of each piece of paper.
Procedure:
The coins represent a material that will decay over time. As time passes, some of the material will change from one substance to another. Each time you turn a penny over, you are representing the original (parent material) substance changing into another substance (daughter material).
1. Turn all 50 coins heads up. Imagine that 5 years have gone by.
2. Turn 25 coins tails up. You now have 50% parent material and 50% daughter material. What is the half life of this substance? (20 Points)
3. Imagine that another half life has gone by. Remember that ONLY the parent material can change to the daughter material. Turn over your pennies to represent the passing of another half life. How much total parent material and how much total daughter material do you now have? You may express your answer in number of pennies or in %. (Note: Since you cannot turn over half a penny, round the actual number of pennies you would turn over up.) (20 points)
4. How many half lives will pass before you have only 3 pennies that are parent material and 47 pennies that are daughter material? (20 Points)
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Hope this helps...
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Question 1: Turn 25 coins tails up. You now have 50% parent material and 50% daughter material. What is the half life of this substance? (20 Points)
Answer:
Based upon the given information, we can assume that the half life of this coin material is 5 years.
Question 2: Imagine that another half life has gone by. Remember that ONLY the parent material can change to the daughter material. Turn over your pennies to represent the passing of another half life. How much total parent material and how much total daughter material do you now have? You may express your answer in number of pennies or in %. (Note: Since you cannot turn over half a penny, round the actual number of pennies you would turn over up.) (20 points)
Answer:
Based upon the given information from Question 2 and Question 3, we can assume that 13 additional coins would be turned over. We started with 50, than flipped 50% of them over, and now another 50% over. We have 12 coins left.
Question 3: How many half lives will pass before you have only 3 pennies that are parent material and 47 pennies that are daughter material? (20 Points)
Answer:
Based upon the given information from all the questions, and based upon our answers we can assume this:
1st half-life: 50 turned to 25 coins
2nd half-life: 25 turned to 12 coins
3rd half-life: 12 turns to 6 coins
4th half-life: 6 turns to 3 coins
So, after 4 half-lives (or after 20 years) we would have 3 coins left that have parent material.
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The products in a decomposition reaction _____.
include an element and a compound
are compounds
are elements
can be elements or compounds
Answer:
can be elements or compounds.
Explanation:
A decomposition reaction occurs when one compound origin two or more compound, or when it breaks and form its elements. For example:
2NaN₃(g) → 3N₂(g) + 2Na(s)
It was formed a compound (N₂) and an element (Na).
which of these describe radiation?
A: transfer of heat between two objects that are touching
B: transfer of heat by the actual movement of warmed matter
C: the process in which energy is emitted by one object transmitted through space and absorbed by another
D: the process in which energy is released by molecules breaking apart
which of these conduction?
A: transfer of heat between two objects that are touching
B: transfer of heat by the actual movement of warmed matter
c: the process in which energy is emitted by one object transmitted through space and absorbed another
D: the process in which energy is released by molecules breaking apart
which of these describes how heat transferred by conduction
A: air molecules touch the warm ground heating them up
B: warm air rises and takes heat with it eventually it cools and sinks
C: sunlight travels through space without the aid of fluids or solids
D: air at the equator rises and sinks at the poles
1. Radiation is the process in which energy is emitted by one object transmitted through space and absorbed by another.
2. Conduction is transfer of heat between two objects that are touching.
3. An example of conduction is when air molecules touch the warm ground, which heats them up. Therefore, For 1. option C, 2. option A, 3. option A is correct.
What is radiation ?The term radiation is defined as the energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field linked with it, and has wave-like properties.
Conduction is heat transportation between two objects that are touching each other. When two objects touch and one has a greater temperature than the other than heat is transferred to the object with the lower temperature.
A common example of conduction is the process of heating a pan on a stove. The heat from the burner convert directly to the surface of the pan.
Thus, For 1. option C, 2. option A, 3. option A is correct.
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In the chemical symbol for nitrogen gas, N2, what does the “2” represent?
please help meeeeee brainly given!
Answer:
The one you chose is the correct answer! You can count on the other persons answer.
Explanation:
Also.... Im in CAVA too, 6th grade
balance the equation: ch4 + 02 --> co2 + h2o
Answer:
CH4 + 2O2 → CO2 + 2H2O
ch4 +202-->co2+2h20
Steps in Balancing a Chemical Equation
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
Steps in Balancing a Chemical Equation
Count each type of atom in reactants and products. ...
Place coefficients, as needed, in front of the symbols or formulas to increase the number of atoms or molecules of the substances. ...
Repeat steps 1 and 2 until the equation is balanced.
Complete the sentence. The higher the hydrogen ion concentration, the ______ the pH.
higher
lower
closer to 7
closer to 14
Answer: Higher the hydrogen ion concentration, lower will be the pH.
Solution:
The negative logarithm of hydrogen ion concentration in mol per litre of the solution.
pH= power of hydrogen ions
[tex]ph=-log[H^+]=log\frac{1}{[H^+]}[/tex]
As we can see from the formula ,if the concentration of hydrogen ion is inversely proportional to pH.
The higher the hydrogen ion concentration, the lower the pH. Therefore, option B is correct.
The pH scale is a measurement of the acidity or alkalinity of a solution. It ranges from 0 to 14, with 7 being considered neutral. A pH value below 7 indicates acidity, while a pH value above 7 indicates alkalinity.
The pH of a solution is determined by the concentration of hydrogen ions (H+) present in the solution.
When the concentration of hydrogen ions increases, the solution becomes more acidic, and the pH value decreases. This is because hydrogen ions are responsible for the acidic properties of a solution.
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