Answer is: B) velocity because the direction is changing.
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.
1. What determines the reactivity of an atom?
Answer:
Valence Electrons is the answer.
Explanation:
Valence electrons are the outermost shell of electrons in an atom. The valence electrons determine the reactivity to chemical reactions an atom has. This is because those with the same number of valence electrons have similar chemical properties. It is also why elements with the same number of valence electrons are put in the same group on the periodic table.
The reactivity of an atom is determined by the number of valence electrons it has.
What determines the reactivity of an atom?Valence electrons are the electrons found in the outermost energy level of an atom. These little particles called electrons are very important in how chemicals react and stick together.
Atoms with not enough electrons in their outermost shell (called valence shell) are more likely to react with other atoms. These tiny particles called atoms want to gain, lose, or share electrons so that they can have a stable arrangement with complete outer shells.
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why did the people of chungungo need to use nets to catch moisture in the air
The people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.
What is moisture in the air?The moisture in the air is the tiny water droplets that are present in the environment or in the air it is mostly present in the cold zone of the environment.
The chungungo is a desert coast area and their is lot of the shortage of the water in their areas and the chances of rain is very low so the people of there use the net to capture the water drops from the air.
Therefore, people of chungungo need to use nets to catch moisture in the air to capture the water droplets present in the environment and collect the water for various uses.
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Final answer:
The people of Chungungo use nets to capture moisture from the air due to limited fresh water sources in their region. This technique is a form of atmospheric water collection and has historical precedence dating back to the Old Stone Age.
Explanation:
The people of Chungungo needed to use nets to catch moisture in the air because they inhabit an area with limited access to fresh water. This innovative method allows them to collect water from fog and mist, which is especially valuable in arid or semi-arid regions where rainfall is scarce. Using nets as a form of atmospheric water collection is an ancient technique with roots tracing back to the Old Stone Age, as evidenced by archaeological findings similar to the limestone “sinkers” from the Maedun cave in South Korea, which date to 27,000 BC. These sinkers were tied to nets to catch small fish in streams, showcasing the long history of using nets for various forms of capturing and harnessing natural resources.
Martha has a large amount of 1.25 M H2SO4 in her lab. She needs 36 grams of H2SO4 for a chemical reaction she wants to perform. How many liters of solution should she use?
Final answer:
To find the volume of 1.25 M H₂SO₄ solution needed for 36 grams of H₂SO₄, calculate the moles of H₂SO₄ and divide by the molarity. Martha should use approximately 294 ml of the solution.
Explanation:
To determine the volume of 1.25 M H₂SO₄ solution Martha should use to obtain 36 grams of H₂SO₄, we must first calculate the number of moles of H₂SO₄ in 36 grams.
The molar mass of H₂SO₄ is (2×1.01) + 32.07 + (4×16) = 98.09 g/mol. Therefore, the number of moles of H₂SO₄ is:
Number of moles = Mass / Molar mass
Number of moles = 36 g / 98.09 g/mol
Number of moles ≈ 0.367 mol
Next, we use the molarity of the solution to find the volume needed:
Molarity (M) = Moles of solute / Volume of solution in liters (L)
Therefore, Volume of solution = Moles of solute / Molarity
Volume of solution = 0.367 mol / 1.25 M
Volume of solution ≈ 0.294 L
Finally, to convert liters to milliliters we multiply by 1000 ml/L:
Volume of solution ≈ 0.294 L × 1000 ml/L = 294 ml
Martha should use approximately 294 ml of the 1.25 M H₂SO₄ solution to get 36 grams of H₂SO₄.
Sherry combined water, lemon juice, and sugar in a pitcher. Sherry has made a homogeneous mixture or heterogeneous mixture
Mixture is homogeneous in case when lemon juice is filtered. But if it is not properly filtered and contains pulp or seed then the resultant mixture would be the heterogeneous.
ExplanationMixture are created using two or more chemical substances. If all the substances in the mixture are in the same phase then it would be a homogeneous mixture else if two substances that differ in a phase from the mixture it is a heterogeneous mixture.
For example freshly squeezed lemon juice, water and mixture of a sugar is homogeneous when lemon is properly filtered because all are present in a same phase.
When Sherry combined water, lemon juice, and sugar in a pitcher, she created a homogeneous mixture, a combination of substances that are uniformly mixed together.
Explanation:Sherry has made a homogeneous mixture when she combined water, lemon juice, and sugar in a pitcher. A homogeneous mixture, also known as a solution, is a combination of substances with a composition that is uniform throughout. For example, when sugar is stirred into a glass of water, it dissolves in the water and the sugar molecules are evenly distributed throughout the mixture, making it homogeneous. In contrast, a heterogeneous mixture is a combination of substances whose composition can vary from point to point because the substances do not thoroughly mix; an example would be oil and vinegar salad dressing.
A homogeneous mixture is a combination of substances with a composition that is uniform throughout. Sherry's combination of water, lemon juice, and sugar in a pitcher would be considered a homogeneous mixture because the components are evenly distributed and the mixture appears uniform.
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Which term is described as a flat expanse of ocean floor
the answer is guyots
The solubility of kcl in ethanol is 0.25 g / 100 ml at 25 oc. how does this compare to the solubility of kcl in water?
Final answer:
The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. Compared to the solubility of KCl in water, KCl is much more soluble in water than in ethanol.
Explanation:
The solubility of KCl in ethanol is 0.25 g/100 mL at 25°C. This means that at this temperature, 0.25 grams of KCl can dissolve in 100 mL of ethanol. Comparing this to the solubility of KCl in water, we can see that the solubility of KCl in water is generally much higher. While the solubility of KCl in ethanol is 0.25 g/100 mL, the solubility of KCl in pure water at 25°C is 27.8 g/100 mL. Therefore, KCl is much more soluble in water than in ethanol.
What role do the coefficients serve in a chemical reaction?
Coefficients balance the equation with respect to the law of conservation of energy.
Coefficients increase the products to increase the efficiency of the reaction. Coefficients balance the equation with respect to the law of conservation of mass. Coefficients increase the reactants to help the reaction proceed.
The coefficients balance the equation with respect to the law of conservation of mass.
A coefficient in a balanced chemical reaction is a numeral written before the symbol of a compound or an element. Also known as a stoichiometric coefficient.The coefficient is used to balance the number of elements present on the reactant and product sides of a chemical reaction.The balancing of the number of elements on both sides is done because the chemical reaction follows the law of conservation of mass.So, from this, we can conclude that the coefficients balance the equation with respect to the law of conservation of mass.
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A theory derived from a literal interpretation of the genealogies of Scripture (as that worked out by Ussher) implies that the earth was created about_______ years ago.
Answer:
Six thousand
Explanation:
The Ussher sequence is a seventeenth century order of the historical backdrop of the world detailed from a strict perusing of the Old Testament by James Ussher, the Archbishop of Armagh.
Priest James Ussher, a 17th-century Anglican pastor and scriptural researcher had the appropriate response. aaccording to him, in a 1658 sequence titled The Annals of the World, God made the world on October 23, 4004 BCE which accounts for 6000 years for the age of the earth.
Mendeleev organized his Periodic Table by _____ in the same way that today's Periodic Table is organized by atomic number.
Mendeleev organized his Periodic Table by increasing atomic mass in the same way that today's Periodic Table is organized by atomic number.
What is Periodic Table?A periodic table, also known as an elemental periodic table, is a tabular representation of the chemical elements.
It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.
Mendeleev positioned elements in rows in his periodic table by increasing atomic mass.
Elements with lower atomic masses were located on the left within a row.
Every time the chemical characteristics of the elements repeated, Mendeleev began a new row. As a result, all of the elements in a column shared the same properties.
Because of the arrangement of the elements, it is known as the periodic table.
Thus, the he arranged it by increasing atomic mass.
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Final answer:
Dmitri Mendeleev organized the original Periodic Table by atomic mass and predicted undiscovered elements by leaving gaps for them, differing from the modern table's organization by atomic number.
Explanation:
The Russian chemist Dmitri Mendeleev organized his Periodic Table by atomic mass, unlike the modern Periodic Table which is organized by atomic number. He encountered a challenge where he had to list some elements out of order of their atomic masses to align them with others of similar chemical properties. Mendeleev was developing a chemistry textbook for his students and needed a logical way to present the known elements.
During this process, Mendeleev left gaps in his Periodic Table to maintain the grouping of chemically similar elements, predicting the existence of undiscovered elements that would fit into these gaps. These gaps provided the periodic table with a predictive value which was validated when elements like gallium, scandium, and germanium were discovered with properties closely matching his predictions.
Making models involves creating representations of complex objects or processes to help people study and understand things that cannot be observed directly. A. true B. false
The statement is true; models are used to represent complex systems that are difficult to study directly, such as subatomic particles or large-scale environmental processes.
Explanation:Making models involves creating representations of complex objects or processes to help people study and understand things that cannot be observed directly. The correct answer to the student's question is A. True.
Scientific models are simplified versions of a part of the real world that help us understand, analyze, and predict behaviors of complex systems. These models can take the form of physical constructions, mathematical equations, computer programs, or simulations. For instance, atomic models allow us to visualize and understand the structure of an atom, even though atoms are far too small to be seen with the bare eye.
Models are particularly beneficial in fields like physics, where phenomena at very small scales or very high speeds occur, which are beyond human perception. However, it is essential to acknowledge that models are approximations and are not as detailed as the real phenomena they represent, and it's important to understand their limitations.
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how many mg of a 31-mg sample of calciul 47 remains after 45 days
How many atom of cd are in 3.00g of cadmium
You must first convert the supplied value to moles because the molar mass of cadmium is 112.41 grams. Divide 3 grams by the molar mass of 112.41 grams to accomplish that. Consequently, there are 1.601022 cadmium atoms in a 3.00 gram of cadmium.
What is the best way to find number of atom in an element?Using the periodic chart, calculate the element's molar mass. Divide the given mass in grams by the molar mass to get the number of moles.
Multiply the number of moles by Avogadro's number to obtain the total number of atoms.
The amount of units in one mole of any substance is known as Avogadro's number, and it is equal to 6.02214076 1023.
Depending on the substance and the nature of the reaction, the units may be electrons, atoms, ions, or molecules (if any).
Therefore, 3.00g of cadmium contain 1.60×1022 atoms.
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To find the number of atoms of cadmium in 3.00 grams, divide the mass by the molar mass of cadmium to get moles and then multiply by Avogadro's number. The calculation reveals there are approximately 1.61 x 10²² atoms of Cd in 3.00 grams.
To determine how many atoms of cadmium (Cd) are in 3.00 grams of cadmium, we use Avogadro's number and the molar mass of cadmium. The first step is to find the number of moles of cadmium in 3.00 grams.
Calculate the number of moles of cadmium: Number of moles = mass (in grams) / molar mass (in grams per mole). The molar mass of cadmium is approximately 112.411 g/mol.
Multiply the number of moles by Avogadro's number (6.022 x 10²³ atoms/mol) to obtain the number of atoms.
Here's the calculation:
Number of moles = 3.00 g / 112.411 g/mol = 0.0267 mol
Number of atoms = 0.0267 mol x 6.022 x 10²³ atoms/mol = 1.61 x 10²² atoms of Cd
A farmer wants to determine if a new fertilizer gives a better crop yeild than her old fertilizer. she spreads the old fertilizer in field A, which crop had a brand new irrigation system. she spreads the new fertilizer in field B, which has a irrigation system that will be repaired next season. at the end of growing season, field A has a better yeild. the farmer determines that her old fertilizer is the better fertilizer. this an example of which of the following A. cultural bias B. personal bias C. data presentation error D. experimental bias
Answer: D. experimental bias
Explanation:
An experimental bias is the condition in which the experimenter manipulate the experimental procedure, equipment and even the results so as to obtain the desired outcome.
The given situation is an example of experimental bias this is because of the fact that field A was supplied with old fertilizers and brand new irrigation system but field B was supplied with new fertilizers and irrigation system which will be repaired in next season. Hence, a experimental bias is done so as to show that the old fertilizer is better than the new one.
Suppose the half-life of an element is 10 years. How many half-lives will it take before only about 6% of the original sample remains?
3 half-lives
4 half-lives
5 half-lives
6 half-lives
Explain how the temperature of a substance is related to the kinetic energy of its molecules.
When an article is in motion then the measure of energy stored in it is called kinetic energy.
Kinetic energy is required to speed up the body of the given mass so that it moves from the resting state. It is present only when the object is moving.The kinetic energy of the object can be calculated by the unit Joules and by the formula:[tex]\text{Kinetic}\; \text{Energy} &= \dfrac{1}{2}\; \text{mv}^{2}[/tex]
where, m = mass of the article in kg
v = velocity in [tex]\dfrac{\text{meter}}{\text{seconds}}[/tex]
The temperature of any object is relevant to the kinetic energy that the object possesses.When the temperature of an object is increased some of the temperatures gets consumed in the form of energy while the remaining energy is used in increasing the movement of the object.
Therefore, the kinetic energy is directly proportional to the temperature.
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What is the mass of 3.25 moles of fluorine which has a molar mass of 18.998 g per mole
Want answers and how to do this, please.
Which of the following explains why metals are able to be pounded, extruded, bent, and shaped without breaking?
The reason the metals are malleable, is because they have mobile electrons in their s orbitals.
The ions create a lattice-like structure held together by the metallic connections. Metallic bonds are what allow metals to flex without breaking and conduct electricity.
What is metallic bond ?Chemical bonds known as metallic bonds are produced by the electrostatic attraction of positively charged metal ions and conduction electrons. The sharing of free electrons among a structure of positively charged ions could be used to characterize it.
Metal atoms form metallic connections. Ionic bonds link metals to non-metals, whereas metallic bonds link many metal atoms. Metallic bonding can be observed in action on copper wires and sheets of aluminum foil.
When the charge is dispersed over a broader area than the size of a single atom in a solid, metallic bonds are created. Most left-handed elements in the periodic table form metallic bonds.
Thus, Metallic bonds are what allow metals to flex without breaking and conduct electricity.
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The units for density take the form of a mass unit divided by a(n) ____________ unit
true or false there are more electrons than protons and negatively charged atom
What happens to mass and energy in a closed system?
Answer: Only energy can enter or exit a closed system
Explanation: Apex
The mass and energy in a closed system did not change, it conserved. In a reaction, the mass of the reactant will be equal to the mass of the product.
What is a closed system?A closed system is a thermodynamic system, in which there is no transfer of energy and mass with the outer environment. There is no change in a system to take place.
Thus, the mass and energy in a closed system did not change, it conserved. In a reaction, the mass of the reactant will be equal to the mass of the product.
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All organic compounds are found in living organisms. True or False
The answer is actually False.
Answer:
FALSE
Explanation:
I got the question correct.
Relate the statement “You can’t get something for nothing” to the law of the conservation of mass.
How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred
A substance that is dissolved in another substance is which of the following?
A)Saturation
B)Solubility
C)Solute
D)Solvent
Its not D, im not quite sure but if you have to guess then choose ab or c
C. Is your Answer (Solute)
Took The Test
Which state of matter does this image represent? Image of lightning Solid Liquid Gas Plasma
Which of the following elements is the most reactive? Beryllium Calcium Magnesium Barium
Answer:
Barium
Got this on a test and got it right! :)
A neutral atom of chlorine (Cl) has an average mass of 35 amu and 17 electrons. How many neutrons does it have?
17
35
18
52
This is a type of element that has many valence electrons, not a conductor.
The type of elements that have many valence electrons and are not good conductors are called nonmetals. They are known for their hard and brittle nature with high to very high melting points. While they can conduct electricity as a liquid, in solid state they are poor conductors.
Explanation:The elements referred to in the question are called nonmetals. These elements, which are often found on the right side of the periodic table, have many valence electrons and are poor conductors of electricity. Some examples of nonmetals include nitrogen, oxygen, and the noble gases.
Nonmetals have various physical and chemical properties that distinguish them from metals. For instance, they are usually hard and brittle, and can conduct electricity as a liquid but not as a solid. Additionally, nonmetals have high to very high melting points. All these features are due to their electrons being more tightly bound to their nuclei than in metals.
Another category closely related to nonmetals are the metalloids, like boron, silicon, germanium, arsenic, antimony, and tellurium. These elements exhibit properties of both metals and nonmetals. Although they may appear metallic, they do not conduct electricity as well as metals and hence can be considered as semiconductors. Their chemical behavior also falls between that of metals and nonmetals.
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what do geologists use index fossils for?
A. dating of rock layers
B. identifying the type of rock in a rock layer
C. providing evidence of climate change
D. tracking migration of prehistoric species
Geologists use index fossils for dating of rock layers
Geologists use index fossils to determine the age of rocks. Index fossils are also known as key fossils; they define dating of rock layers.
Further ExplanationSome of the characteristics of fossil index include:
It is widespread Not many in geologic time It is also distinctiveIndex fossils are defined as “commonly found” because they are widespread but limited in a period of time. If an index fossil is found in a particular layer, the layer will determine the age of the layer, therefore with the use of index fossils, one can easily define the geological periods. In many cases, the geological periods can last as far as tens of millions of years.
Index fossils have a very short life span, therefore the age at which they are found defines their age. They are used to determine the period and eras of the geological time scale.
Geological time scale is also known as GTS, it refers to a system of dating which relates stratigraphy to time. Geological time scale is used by Geologists to determine the period and the relationship of events that have taken place in the history of the earth.
Therefore, Geologists use index fossils for dating of rock layers
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Describe why index fossils are useful to geologists https://brainly.com/question/7541527Index fossils allow geologists https://brainly.com/question/10022663KEYWORDS:
rock layersindex fossilsgeologistsgeological time scalewidespreadGeologists use index fossils for dating rock layers. The correct answer is option A.
An index fossil is a fossil that is known to have lived during a specific geologic time period. By identifying the index fossils in a rock layer, geologists can determine the age of the rock layer.
Index fossils are used because they are widespread, abundant, and have a short geologic range. This means that they are found in many different locations, are common in the fossil record, and only existed for a relatively short period of time.
By comparing the index fossils found in different rock layers, geologists can determine the relative ages of the rock layers.In conclusion, to date rock layers, geologist use index fossil.Option A is the correct answer.
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