Answer:
Explanation:
A double repalcement reaction is a type of reaction in which there is exchange of ions between two compounds leading to the formation of new products. It is also known as double displacement reaction.
BC+DE produces BE+CD.
A double replacement reaction leads to the formation of two new compounds Be and CD.
How does the volume occupied by a cubic centimeter compare with the volume occupied by a millimeter
In 1895, X-rays were accidentally discovered during a scientific experiment. Today, X-rays are used to screen luggage in airports. This is an example of _____.
society influencing technology
society influencing science
science influencing technology
science influencing society
Which of the following has the least number of identified substances?
*compounds
*elements
*molecules
*subatomic particles
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How many oxygen atoms are in 7.20 moles of H2SO4?
There are approximately 1.73 x 10^25 oxygen atoms in 7.20 moles of H2SO4. This is calculated by determining the number of oxygen atoms per mole of H2SO4 (4), then multiplying that by the number of moles (7.20) and by Avogadro's number.
Explanation:The student is asking about the number of oxygen atoms in 7.20 moles of H2SO4. The molar mass of H2SO4 is approximately 98.09 g/mol and it is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms.
One mole of H2SO4 contains 4 moles of oxygen, so 7.20 moles of H2SO4 would contain 7.20 * 4, which equals 28.8 moles of oxygen. Since a mole of any substance contains Avogadro's number (6.022 x 10^23) of entities (atoms, in this case), 28.8 moles of oxygen atoms would contain 28.8 * 6.022 x 10^23 oxygen atoms.
Doing the math, we find that there are approximately 1.73 x 10^25 oxygen atoms in 7.20 moles of H2SO4.
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Which metals will be able to reduce copper ions in solution
help with number 5 please
How is earths environment unique in the solar system
Where is earths mantle located
What symbol is used to separate the products from each other or the reactants from each other in a chemical reaction
A. An equal sign
B. An arrow pointing to the left
C. An arrow pointing to the right
D. A plus sign
A chemical reaction includes two or more reactants and the products separated by an arrow. The reactants are separated each other by a plus sign and the same in between the products.
What is a reaction?A chemical reaction is the combination of two or more reactants or reacting species. Through effective collision, they form products.
The reactants and products are separated each other by a right arrow. Let A and B the reactants and C be the product. Then, the reaction is written as below:
A + B [tex]\rightarrow[/tex] C.
Sometimes the reactions can be reversible where we can use a reversible arrow ' ⇄ ' which indicates that the products can in turn convert into the reactants.
Sometimes an equal sign is used to indicate the product side in a reaction but it is not scientific and an arrow is used more properly.
Therefore, the symbol used to separate reactants from each other r products from each other is a plus sign. Hence, D is correct.
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Final answer:
In a chemical equation, reactants are written on the left hand side and products on the right hand side. The arrow is used to indicate the direction of the reaction, and plus signs (+) separate individual reactant and product formulas.
Explanation:
A chemical equation uses symbols to describe a chemical reaction. In a chemical equation, reactants are written on the left hand side of the equation and the products on the right. The arrow is used to show the direction of the reaction. Plus signs (+) separate individual reactant and product formulas.
All of the following are types of electromagnetic radiation except?
visible light
microwaves
plasma
gamma rays
In scientific method, results are shared during _____.
1.data analysis
2.observation
3.communication
4.data collection
The hardest mineral is called________, while the softest is called __________.
A cube of ice melts in a beaker to form 10 g of water. What is the best estimate of the mass of the ice cube?
2 g
5 g
10 g
15 g
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The unit m3 measures a. length b. area c. volume d. time
The unit m3 or cubic meters is used to measure volume in the International System of Units. Volume is the amount of space a three-dimensional object occupies.
Explanation:The unit m3 or cubic meters is used to measure volume, not length, area, or time. Volume refers to the amount of space that a three-dimensional object occupies, which is measured in cubic units. In the International System of Units (SI), the standard unit of volume is cubic meters.
For example, if you have a box that is 1 meter long, 1 meter wide, and 1 meter high, its volume would be 1 cubic meter (m3).
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The unit m³ represents volume, which can be visualized as a cube with an edge length of 1 meter. The concept of a cubic meter also influences other derived quantities like density. Understanding volume extensively helps with tasks involving unit conversions.
Explanation:The unit m³ (cubic meter) represents volume, not length, area, or time. It is measured as the product of three lengths. This is most easily visualized by imagining a cube with an edge length of exactly one meter. This cube, which has both length, width, and height of 1 meter, would occupy exactly one cubic meter of space. Figure 1.25 illustrates this concept by comparing different units of volume with relatable objects.
The concept of a cubic meter also relates to the physical quantity of density, which is the mass per volume and can be expressed in units like kilograms per cubic meter (kg/m3).
Derived quantities like volume can be expressed using SI base units such as this. Understanding the concept of volume, measured in cubic meters, helps with computational tasks, particularly those involving conversion between different units.
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Compare the solubility of olive oil and acetic acid in water. Why is one substance more soluble than the other?
Acetic acid is highly soluble in water due to its polar nature, while olive oil's nonpolar properties result in low solubility.
Acetic acid is highly soluble in water due to its polar nature, allowing it to interact with water molecules through hydrogen bonding. On the other hand, olive oil is nonpolar and lacks the ability to form significant interactions with water, resulting in low solubility.
The presence of a carboxylic acid group in acetic acid facilitates its solubility in water by enabling hydrogen bonding with water molecules. In contrast, the predominantly nonpolar nature of olive oil limits its solubility in water due to a lack of interactions with water molecules.
Overall, the polar vs. nonpolar properties of acetic acid and olive oil play a crucial role in determining their solubility in water.
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In the scientific method, what does the purpose do?
A. It tells what the conclusion should be
B. It states why the research is being done
C. It states why all other theories are wrong
D. It helps to analyze the experiment
Explain how independent assortment occurs in cells and explain its importance.
Independent Assortment is the second law of inheritanceTraits are passed from parents to offspring independently of one another.Independent assortment is random and occurs during Metaphase I of meiosis.There are two possible alignments for the chromosomes.Since the alignments are random and not assigned, genetic variation occurs.
If an object’s mechanical energy is equal to its potential energy how much kinetic energy does the object have how do you know
Final answer:
If an object's mechanical energy is equal to its potential energy, the kinetic energy of that object is 0 joules because the total mechanical energy is the sum of kinetic and potential energy which must remain constant in the absence of non-conservative forces.
Explanation:
If an object's mechanical energy is equal to its potential energy (PE), this means that the object has no kinetic energy (KE) at that moment. We deduce this from the principle that the mechanical energy of a system is conserved in the absence of non-conservative forces, such as friction or air resistance. Therefore, if mechanical energy equals potential energy, then the equation KE + PE = constant simplifies to 0 + PE = constant, which indicates that KE must be 0 joules because all the mechanical energy is stored as potential energy.
how can something with different atoms be a pure substance and not a mixture
what is the basis of an organic molecule?
Describe two ways in which atoms and molecules from solid?
Methane reacts with oxygen to produce carbon dioxide and water. What are the products of this reaction? A. methane and water B. oxygen and carbon dioxide C. methane and oxygen D. carbon dioxide and water
The correct answer is D. carbon dioxide and water
an element that is liquid at room temperature but gas at 100 degrees
Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?
Particles move independently of one another and are widely spaced.
Which of the following is a valid reason why a scientist might reject a scientific theory
A scientist might reject a scientific theory when contradictory observations are found, as scientific theories must be based on testable and falsifiable evidence that can withstand rigorous scrutiny.
Explanation:Valid Reasons for Rejecting Scientific Theories
A scientist might reject a scientific theory for several valid reasons. However, the reason that aligns with the scientific method and process is the discovery of contradictory observations. When experimental results or observations do not support the theory or directly conflict with it, scientists must reconsider and potentially discard the current theory. This is because a central tenet of the scientific method is that hypotheses and theories must be testable and falsifiable. If evidence accumulates that contradicts a theory, the responsible scientific action is to refine or replace the theory to better reflect the evidence.
Theories are not discarded due to public opinion, religious opposition, or legal and institutional votes, as these are external to the empirical basis of science. Rather, scientific theories are constantly subjected to scrutiny and must withstand rigorous testing and confirmation from multiple independent sources. This iterative process ensures that scientific knowledge evolves and becomes more robust over time.
The discovery that uranium is a radioactive element was made by Marie Curie. True or False
Answer:
True
Explanation:
10x4 Thousands = _ Thousands =
Answer:
40 Thousands
Explanation:
This is a multiplication account. Although the value seems very high, you can first ignore the name "Thousands" by multiplying only the decimal numbers and adding "Thousands" at the end.
Thus:
10x4 = 10 + 10 + 10 + 10 ----> 40 Thousands
describe how crust forming on the surface of lava illustrates the principle that removing heat from a system may result in a change in state.
Final answer:
Crust forming on lava showcases how heat removal can induce a state change. Lava is defined as a molten rock that is from a volcano or from a fissure in the surface of the earth.
Explanation:
Crust forming on the surface of lava illustrates the principle that removing heat from a system may result in a change in state. As lava cools and solidifies on the Earth's surface, the heat is extracted from the molten rock, causing it to transition from a liquid state to a solid state, forming new crust. This process exemplifies how altering the thermal energy within a system leads to a change in the physical state of the material.