Final answer:
The balanced chemical equation for the decomposition of copper(II) nitrate into copper(II) oxide, nitrogen dioxide, and oxygen is 2 Cu(NO3)2 ➔ 2 CuO + 4 NO2 + O2. This illustrates the conservation of mass by ensuring equal numbers of each type of atom on both sides of the equation.
Explanation:
The question you've asked pertains to balancing the chemical equation Cu(NO3)2 ➔ CuO + NO2 + O2. This process involves ensuring that the number of atoms for each element is the same on both sides of the equation.
To balance this equation, we start with the given substances and adjust the coefficients (the numbers in front of the chemical formulas) to make sure the atoms are balanced. After several steps of balancing, we arrive at the balanced equation:
2 Cu(NO3)2 ➔ 2 CuO + 4 NO2 + O2
This equation indicates that 2 moles of copper(II) nitrate decompose to form 2 moles of copper(II) oxide, 4 moles of nitrogen dioxide, and 1 mole of oxygen gas. The balancing process takes into account the conservation of mass, which states that atoms are neither created nor destroyed in a chemical reaction.
What energy transformation occurs when a battery-powered toy car is set into motion when it is switched on? chemical to mechanical to electrical electrical to mechanical to chemical electrical to chemical to mechanical chemical to electrical to mechanical
chemical because batterys then eletrical becuase you turn on the car then mechanical
Cells that perform a specific function in an organism ______.
Perform all of the functions
Are specialized
Are all the same
Can survive on their own
PLEASE NO INCORRECT ANSWES AND PLEASE ANSWER QUICKLY
Why do giraffes have long necks that allow them to eat leaves in trees? A. for acquiring energy
B. for reproducing
C. for maintaining structure
D. for protection
The first picture is for the first question and the second picture is for the 2nd question
Which is the topmost layer of the rock?
Layer A
Layer B
Layer C
Layer D
Which statement about the rock fossils is true?
Organism X existed for a short period of time.
Organism Y became extinct before organism X.
Organism X and organism Y existed at the same time.
Organism Z became extinct much before organism X.
Scientists find an artifact next to an index fossil. What can they conclude about the unknown age of the artifact?
The artifact is older than the index fossil.
The artifact is younger than the index fossil.
The artifact is approximately the same age as the index fossil.
The artifact's age is not related to that of the index fossil.
What process uses analysis of the decay of atomic particles to determine exact age?
Radioactive dating
Law of superposition
Relative dating
Geologic time
Answer:
1. B
3. C
4. its radioactive dating i learned about this
what element on the periodic table has a mass number of 155 and 99 for the number of electrons
Final answer:
The element with 99 electrons is Einsteinium (Es), and a mass number of 155 refers to the total number of protons and neutrons, indicating a specific isotope of Einsteinium with 56 neutrons.
Explanation:
The question asks about an element with a mass number of 155 and 99 for the number of electrons. Firstly, the number of electrons in an atom determines which element it is, as the number of electrons equals the number of protons in a neutral atom, known as the atomic number. With 99 electrons, we are referring to the element Einsteinium (Es), which is a synthetic element located in the actinide series of the periodic table.
The mass number mentioned, 155, typically refers to a specific isotope of an element, considering the mass number is the sum of the protons and neutrons within an atom's nucleus. Since Einsteinium has 99 protons (because it has 99 electrons), an isotope with a mass number of 155 would then have 56 neutrons (155 - 99 = 56).
It's also important to note that the mass number shown in parentheses on the periodic table represents the mass number of the most stable or most commonly occurring isotope for that element.
According to Dalton's atomic theory, which statement is true about atoms of the same element? They can be destroyed. They have identical mass. They have different properties. They can be divided into elements.
Answer:
The correct statement is :They have identical mass.
Explanation:
Matter is composed of smallest indivisible particle named atom.Atoms of same element have similar size , mass and chemical proprieties where as different atoms of different element differ in all those properties.An atom cannot be created or destroyed or further sub divided.Atoms of different elements combines together in a fixed ratio to from compounds.During a chemical reaction atoms are rearranged to form a new compounds.Which of these is an indication that a chemical reaction has occurred?
A.The melting of a substance
B.The boiling of a substance
C. The formation of precipatation
D The freezing of a substance
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which is the smallest particle into which a compound can be broken down and still remain the same compound
Which of the following are advantages of the SI system?
(Select all that apply).
A) It is easy to change from one unit to another.
B) It allows scientists to compare experimental results.
C) All its units are based on the number 100.
D) It is based on inches and pounds.
Answer:
it is easy to change...
it allows scientists...
Explanation:
The temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be A) 20 B) 100 C) 273 D) 303
The temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be 20 K. Thus option A is correct.
What is temperature?Temperature is defined as a measurement of an object or substance's warmth or coldness in relation to a reference value.
Temperature can also be defined as the average kinetic energy of the particles in an object.
Temperature scale is defined as a means of indicating or measuring temperature in relation to a unit of measurement and a starting point (0 or zero).
There are basically three types of temperature scale we use.
Celsius scaleKelvin scaleFahrenheit scaleThus, the temperature of a sample of water is changed from 10°C to 30°C. The same change in Kelvin would be 20 K. Thus option A is correct.
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some foods like enduves or brussel sprouts have a bitter taste recipe books often recommend cooking them with tomatoes vinegar or lemon juice why?
Recipe books suggest adding acidic ingredients like tomatoes, vinegar, or lemon juice to bitter foods to make them more palatable. The acidity helps to neutralize bitter flavors and enhances the dish's overall taste by adding a more acceptable sour taste.
The perception of bitterness in foods such as endives and Brussels sprouts is linked to the presence of certain compounds that can be indicative of toxic substances. The taste buds on the posterior tongue are especially sensitive to bitter tastes as a protective mechanism to induce the gag reflex to prevent the ingestion of potentially poisonous substances. To counteract the bitterness and make these foods more palatable, recipe books often recommend adding acidic ingredients like tomatoes, vinegar, or lemon juice. These acids can neutralize the bitterness to some extent and enhance the overall flavor profile of the dish by adding a sour element that is generally more acceptable to our taste palette.
Acids like citric acid found in lemon juice and acetic acid in vinegar are known to sour tastes which can help to balance or mask the bitter flavor. Moreover, acidic ingredients might also interact with volatile compounds that contribute to the bitterness, neutralizing them and making the food more enjoyable to eat.
You are outside on a clear night. You see the moon, but the face of the moon is all dark; no reflected light seen. This is most likely a _________ moon.
1.Why is there more mass in a metal spoon compared to a plastic spoon?
Metals have higher density than plastics. Hence they weigh more on small volume. Therefore a metal spoon has higher mass than a plastic spoon.
What is density ?Density of an object is the measure of the mass per unit volume of the substance. It describes how closely its particles are packed in its volume. The density of a substance depends on the bond type, pressure and temperature as well.
Metals are electropositive elements with greater densities. The metallic particles are held together by strong metal - metal bonds. This makes the metal lattice denser and hard.
Therefore, a metal spoon will have greater density and thereby mass in a given volume than plastic spoon which is of very less density compared to the metals.
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what is the total number of atoms in the formula below? NH3
In complete sentences, describe the flow of energy from the sun to producer and the to a consumer
Answer:
The chlorophyll in a plants leaves absorbs light energy from the sun which is then later used to make glucose and oxygen. Consumers eat the plants to get nutrients. Consumers get their energy from the food they eat.
Explanation:
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What are two physical properties that can help you identify a substance?
Final answer:
Two physical properties that are useful for identifying a substance are its density and melting point. Density helps determine whether the substance will float or sink, while the melting point assists in distinguishing substances under controlled temperature conditions.
Explanation:
Two physical properties that can help you identify a substance are its density and melting point. Density is a measure of how much mass is contained in a given volume and can be particularly useful when determining whether a substance will float or sink when placed in a fluid.
The melting point—the temperature at which a substance changes from a solid to a liquid—can also be unique to a substance and is especially useful when comparing similar looking materials under controlled temperature conditions.
For example, pure water has a density of 1 gram per cubic centimeter at room temperature, and ice, which is solid water, will float in liquid water due to its lower density. The melting point of water is 0 degrees Celsius, which is a well-known physical constant.
On the other hand, substances like gold and silver have melting points of 1064 degrees Celsius and 961.8 degrees Celsius, respectively, and much higher densities, allowing for easy distinction from substances with similar appearance but different physical properties.
In the periodic table, which elements had complete outer shells? Also include name and symbol
What is a hypothesis?
Answer:
a possible explanation or answer to a scientific question that is based on prior knowledge or research and is testable
Do water molecules leave or enter a cell in an isotonic solution?
If a mineral has a metallic shine to it, which property of a mineral is being measured
The property of the mineral is luster.
A metallic luster would reflect light the same way as a metal would.
D- Luster is your answer
What is the true about scientific idea
which property of the rock can be directly determine when the rock is placed in the overflow container
what do all electrolytes have in common?
Final answer:
Electrolytes share the property of being able to conduct electricity when in solution because they dissociate into ions. Ions like sodium, potassium, and chloride are vital for body functions such as nerve transmission and water balance. Nonelectrolytes, which do not dissociate into ions, cannot conduct electricity.
Explanation:
All electrolytes have the common property of being able to conduct an electric current when dissolved in water or melted. This is because electrolytes are composed of ions, which are electrically charged particles. When these ions are in solution, they move towards electrodes of opposite charge, enabling the flow of electricity. For instance, when sodium, potassium, and chloride dissolve in water, they dissociate into Na+, K+, and Cl- ions, respectively. This dissociation into ions is what makes these substances electrolytic.
Sodium, potassium, and chloride are particularly important in the human body for their roles in nerve impulse conduction, muscle contractions, and regulating water balance. They, along with other cations like calcium and magnesium and anions such as bicarbonate, phosphate, sulfate, organic acids, and proteins, help maintain the body's ionic balance, acid-base balance, and osmotic pressure in bodily fluids. Electrolytes are crucial for maintaining life processes.
By contrast, nonelectrolytes do not dissociate into ions and therefore do not conduct electricity when dissolved or melted. Substances such as glucose and ethylene glycol are examples of nonelectrolytes.
when 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n) A.) Element. B.) Compound. C.) Isotope. D.) Ion.
The correct answer to the question is option B. Compound
An element is a pure substance that can not be broken down into simpler substance.
A compound is a substance consisting of two or more elements chemically combined together.
Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number of the atoms involved.
An ion is an atom or group of atoms which possess an electric charge.
The combination of carbon and oxygen will produce a compound. This is true because the carbon and oxygen will be chemically combined together as a new bond will be formed between them given rise to a new substance.
C + O₂ —> CO₂Learn more: https://brainly.com/question/15647245
What is the SI base unit of temperature?
Answer:
Kelvin (K)
Explanation:
A reaction produces 0.829 moles of H2O. How many molecules are produced?
The reaction produces approximately 4.987 x 10^23 molecules of H2O.
Explanation:To determine the number of molecules produced, we need to convert the given moles of H2O to molecules. One mole of any substance contains Avogadro's number of molecules, which is approximately 6.02 x 10^23 molecules. Therefore, to convert moles to molecules, we multiply the number of moles by Avogadro's number.
0.829 moles x (6.02 x 10^23 molecules/mole) = 4.987 x 10^23 molecules
This representation shows the two hydrogen atoms (H) bonded to the oxygen atom (O). The angle between the hydrogen-oxygen-hydrogen atoms is approximately 104.5 degrees. Water is a polar molecule, meaning it has a slight electrical dipole moment due to the unequal sharing of electrons between the oxygen and hydrogen atoms, resulting in a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms. This polarity gives water unique properties, such as its ability to form hydrogen bonds and its importance in various biological and chemical processes.
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which of the following is an example of physical change?
A. crushing a soda can
B. copper tarnishing
C. baking a cake
D. mixing baking soda and vinegar
Crushing a soda can represents a physical change because the change is only in the shape, and the material of the can does not undergo a chemical transformation.
The student's question pertains to distinguishing between physical changes and chemical changes. In the list provided, option A, crushing a soda can, is an example of a physical change. This is because crushing the can changes its shape, but the material it is made of, typically aluminum, is not chemically altered in the process. There is no formation of new substances; the change is merely physical.
Let's review the other options briefly: B. Copper tarnishing is a chemical change because it involves the reaction of copper with sulfur compounds to form a new substance, copper sulfide. C. Baking a cake is a chemical change because new substances are formed as a result of the heat causing chemical reactions between the ingredients. D. Mixing baking soda and vinegar is also a chemical change because it results in the formation of carbon dioxide gas, water, and other substances.
What is the correct classification of a mixture in which both a solid and a liquid are visible? a homogeneous mixture and a solution a homogeneous mixture and a suspension a heterogeneous mixture and a solution a heterogeneous mixture and a suspension
Answer:
I think its c
Explanation:
The correct classification for a mixture with visible solid and liquid that can settle is a heterogeneous mixture and a suspension, like mud in water.
The correct classification of a mixture in which both a solid and a liquid are visible, and in which the particles can settle out, is a heterogeneous mixture and a suspension.
This is because heterogeneous mixtures consist of two or more substances that are not uniformly distributed, and in a suspension, the solid particles are large enough to eventually settle out from the liquid.
An example of such a mixture would be mud mixed with water. This is contrasted with a homogeneous mixture, or a solution, such as salt dissolved in water, where the different substances cannot be visually distinguished even under a microscope.
What is asubstance that flows Called
Elements that have the lowest density of all the metals are called