Answer:
The independent variable controls the dependent variable.
Explanation:
Which of the answer choices correctly identifies a scenario that displays evidence a chemical reaction is occurring?
Paper absorbs liquid and sinks.
Sugar burns and turns black.
Water boils and evaporates.
Glass vibrates and shatters.
Answer: Option (b) is the correct answer.
Explanation:
A chemical reaction is the one in which there occurs change in the chemical composition of a substance in order to result in the formation of a new compound.
For example, when sugar burns then it means it is chemically reacting due to which it turns into black.
On the other hand, a physical change is the one in which there occurs no change in chemical composition of a substance. As a result, no new compound is formed.
For example, Paper absorbs liquid and sinks, Water boils and evaporates, and Glass vibrates and shatters are all physical changes.
Thus, we can conclude that sugar burns and turns black correctly identifies a scenario that displays evidence a chemical reaction is occurring.
Is coffee a pure substance or a mixture?
Answer:
its is a subtance
Explanation:
ifff im wrong im soooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo sorry.# i wasted my time on that lol.
Coffee is considered a mixture rather than a pure substance because it is made up of multiple components that can be separated. Coffee is a mixture, not a pure substance, due to the variety of components that combine to make it, such as caffeine, water, oils, and other organic compounds.
Explanation:In chemistry, coffee is considered a mixture rather than a pure substance. A mixture is a combination of two or more substances that are not chemically joined together. Coffee is made up of various components such as water, caffeine, oils, and flavor compounds, which can all be separated through various methods.
For example, if you were to run a coffee extraction process using water, you would separate the soluble components of coffee from the insoluble ones. This demonstrates that coffee is not chemically pure but rather a mixture.
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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.
How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred
Match each processes with the correct transfer of energy.
~Energy Loss ........ ~Energy Gain
Freezing
Sublimation
Evaporation
Melting
Deposition
Condensation
freezing-energy lost (exothermic)
sublimation-energy gain (endothermic)
evaporation- energy gain(endothermic)
Melting- energy gain(endothermic)
deposition- energy lost(exothermic)
condensation-energy lost(exothermic)
Answer:
freezing-energy lost (exothermic)
sublimation-energy gain (endothermic)
evaporation- energy gain(endothermic)
Melting- energy gain(endothermic)
deposition- energy lost(exothermic)
condensation-energy lost(exothermic)
how does the universe move?
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.
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
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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The units for density take the form of a mass unit divided by a(n) ____________ unit
Explain the value or importance of using the International System of Units when describing motion. Provide an example that supports your reasoning.
Animal
Explanation:
e e e e e e e e e e e e e e e e e e.
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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which of the following elements does not form a monatomic ion? A.potassium B.sulfur C.chlorine D.xenon
Xenon does not typically form a monatomic ion.
Explanation:In this question, we need to identify the element that does not form a monatomic ion. A monatomic ion is an ion consisting of only one atom.
Potassium (K) forms a monatomic ion with a charge of +1, sulfur (S) can form a monatomic ion with a charge of -2, and chlorine (Cl) can form a monatomic ion with a charge of -1.
However, xenon (Xe) does not typically form a monatomic ion. Xenon belongs to the noble gas family and is highly stable due to its full valence electron shell, so it rarely forms ions.
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Leon made a chart to summarize some characteristics of LED light bulbs.
Which headings best complete the chart?
X: Cost-Effectiveness
Y: Time-Effectiveness
X: Time-Effectiveness
Y: Cost-Effectiveness
X: Benefits
Y: Risks
X: Risks
Y: Benefits
The answer is C. X: Benefits
Y: Risks
Answer:
x benefits y risks
Explanation:
Calculate the mass of oxygen that combines with 20.4g of magnesium to form 34.0g of magnesium oxide
To solve such this we must know the concept of double displacement reaction. Therefore, the mass of oxygen is 27.2g when 20.4g of magnesium react with 34.0g of magnesium oxide.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
2Mg+ O [tex]_2[/tex][tex]\rightarrow[/tex]2MgO
mass of Magnesium =20.4g
Molar mass of magnesium =24gmol
moles of magnesium =0.85moles
moles of magnesium = moles of oxygen =0.85moles
Mass of oxygen =Molar mass of oxygen ×moles of oxygen
=32g/mol×0.85moles
=27.2g
Therefore, the mass of oxygen is 27.2g.
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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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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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explain how you can use physical properties to compare substance
To compare a substance physically, different methods have been applied like measure the dimensions of an object, calculation of volume. physical property also tell you whether the substance is a solid, liquid, or a gas.
What are the difference between chemical and physical property ?Chemical properties of a substance can be measured when a substance undergoes any type of chemical change where as Physical properties does not require any chemical changes, it can be directly observed.
A chemical reaction is conducted to show the chemical property of a substance where as no chemical reaction is required to determine the physical property.
In Chemical properties the compounds are connected by the chemical bonds while in Physical properties the compounds do not show such a relationship.
Some of the Chemical properties include Compressibility, flammability, toxicity, radioactivity while physical properties include Molecular weight, melting point, length, color, odor, shape.
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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.
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.
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
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 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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sand grains, pebbles, mud, shells, and leaves are all examples of _________________
Answer:
The correct answer is "sediment".
Explanation:
A sediment is defined as a solid material that settles down to the bottom of a liquid. Sand grains, pebbles, mud, shells, and leaves are all examples of sediment. The size of a sediment variables from small particles that could be of 2 millimeters (in the case of sand grains), to particles as large as 250 millimeters (in materials such as cobble).
1.Hydrogen is colorless odorless gas that is less dense than air it will react with oxygen to form water which of the following is a chemical property of hydrogen?
It is a gas
it is less dense than air
It is colorless
It reacts with oxygen to form water
2. Sodium is a shiny solid at room temperature it will react with chlorine to form table salt it will react violently with water which of the following is a physical property of sodium?
It is a solid at room temperature
it reacts with chlorine to form table salt
it reacts violently with water
3.Mercury has a density of approximately 5.43 g/ml. If a sample of mercury has a volume of 10ml, what must be the mass of the samples
54.3g
5.43g
0.543g
4.57g
A physical propery of halite (table salt) is its chemical composition.
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
how many mg of a 31-mg sample of calciul 47 remains after 45 days
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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What kind of Romance Novels would kids between the age of 14-18 read. Whether it is an actual book or a book made on sites like Wattpad.
Give a description of your characters, story plot, time/setting, etc.
Is there magic? Is it realistic? Fiction or Nonfiction, why? Vampires? Talking animals?
Anyone have any ideas when it comes to finding that perfect Romance Novel?
Note: I am not talking about a book that is required in school to read. I am talking a book that you randomly find, and actually, think it would be interesting to read.
For ages 14-18, young adult romance novels are popular, often blending aspects of realism and romanticism. Examples include books like 'Twilight', 'The Fault in Our Stars', and 'Divergent'. These novels provide relatable plots and characters while offering an escape into various genres like fantasy, mystery, and dystopian fiction.
Explanation:Teenagers between the ages of 14-18 often lean towards young adult romance novels that incorporate elements of fantasy, mystery, and realism. Two popular categories of stories that these novels might follow are romance and the bildungsroman, a genre focusing on the growth of its main character, fitting given the phase of life teenagers are in.
For example, 'Twilight' by Stephenie Meyer that offers a blend of romance and fantasy with the main characters being a teenage girl and a vampire, set in contemporary times. Other examples are 'The Fault in Our Stars' by John Green, a poignant love story between two teenagers met at a cancer support group, and 'Divergent' by Veronica Roth that blends romance with dystopian fiction.
The beauty of these novels is they take variations from the type of normal life (romanticism) and incorporate them into real life settings (realism). These stories provide young readers an escape from their day-to-day lives, while also offering relatable plots and characters that they can connect with on a personal level. Regardless of whether the novels have elements like magic, vampires, or talking animals, the primary focus rests on the exploration of human emotions, friendships, and romances, imparting a sense of both imagination and reality.
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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.