The _____ identifies an element.

Answer:

Ionic equations and net ionic equations are usually written only for reactions that occur in solution and are an attempt to show how the ions present are reacting. While ionic equations show all of the substances present in solution, a net ionic equation shows only those that are changed during the course of the reaction.

Explanation:

example: Mg + 2 HCl MgCl2 + H2

Answer:

v = 10 cm³

Explanation:

Given data:

Mass of sample = 80 g

Density of sample = 8 g/cm³

Volume of sample = ?

Solution:

We will calculate the volume by rearranging the density formula,

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

d =m/v

d = density

m =mass

v = m/d

Now we will put the values in formula,

v = 80 g / 8 g/cm³

v = 10 cm³

Answer:

1 joule

Explanation:

If you drop a softball from just above your knee, the kinetic energy of the ball just before it hits the ground is about 1 joule

Answer:

When the ball is held up, it has a lot of potential energy and no kinetic energy. As it falls, it starts losing it's potential energy and speeds up to get more kinetic energy. When it hits the floor it has no potential energy, but lots of kinetic energy.

Determining if a rock is magnetic is an example of investigating an intensive property.

C. determining if a rock is magnetic

Explanation:

Intensive properties don't rely upon the measure of the substance present. A few instances of serious properties are shading, taste, and dissolving point. Partitioning one broad property by another broad property, by and large, gives a concentrated worth—for instance, mass (broad) isolated by volume (broad) gives thickness (escalated). The proportion between the two broad properties is a concentrated property. For instance, mass and volume are broad properties, however, their proportion (thickness) is a concentrated property of issue.

Intensive properties are independent of the amount of substance present. The example of investigating an intensive property given is 'determining if a rock is magnetic'. This is distinguished from extensive properties, like mass, length, and volume.

An intensive property is a property of a substance that does not depend on the amount of the substance present. They include properties like temperature, color, hardness, melting point, boiling point, pressure, molecular weight, and density. Among the examples provided, the one that involves an investigation of an intensive property is 'determining if a rock is magnetic'. Whether a rock is magnetic or not is independent of the amount of material you have.

This is contrasted with extensive properties, which do depend on the amount of the substance present. Examples of these would include mass, length, and volume—all options provided except determining if a rock is magnetic.

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The theory of Plate Tectonics describes the forces and motion of Earth's plates. This theory explains the movement of the Earth's crust on a semi-fluid layer beneath, resulting in geographical phenomenon like earthquakes and mountain formations.

The theory which describes the motion of and the forces driving the Earth's plates is D. Plate Tectonics. The Plate Tectonics theory encompasses the concept of the Earth's crust being made up of large pieces, known as plates, that float on a semi-fluid layer underneath. Over time, these plates shift, bump into each other, or even slip beneath one another, causing many of the Earth's major geographical features such as mountains, valleys, earthquakes and volcanoes. This theory has greatly contributed in our understanding of the Earth's geology, and it complements A. First Law of Motion and B. Third Law of Motion, which are principles from Physics that describe general motion and forces, not specifically Earth's plates.

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Answer: 51g

Explanation:

n = m/M (where 'n' is the number of moles, 'm' is the mass and 'M' is the molar mass)

n = 3 moles (Given in the question)

M = 17

(This is because nitrogen has a relative mass of 4u and hydrogen has a relative mass of 1u)

We can rearrange the equation and get that

n * M = m

Therefore, 3 * 17 gives you the mass of 3 moles of ammonia

Which is 51g.

Answer: 51g

Explanation:

To solve for the mass of 3 moles of ammonia(NH3), let's get the mass of 1 mole of ammonia(NH3)

1mole of ammonia (NH3) = 14 +(3x1) = 17g.

Therefore,

3 moles of NH3 = 3 x 17 = 51g

The correct answer is (B) This represents a chemical change only.

The fact that a gas is produced in a new and different substance indicates a chemical change. Chemical changes denote the formation of new substances having their own set of chemical qualities. When heat is applied to the substance, it undergoes a chemical reaction giving birth to a given gas.

This transformation entails the rearrangement of atoms and the breaking or formation of chemical bonds. Physical changes, on the other hand, do not alter the chemical composition of a substance. They have changes in physical properties like shape, size, or state of matter without actually forming new substances.

Since the production of another gas indicates a chemical change, the correct statement amidst these options is that the scenario reflects such (option B).

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Answer:

                     The chemical formula of Formaldehyde is H₂CO and the structural formula is attached below,

                     The chemical formula of Ammonia is NH₃ and the structural formula is attached below,

FORMALDEHYDE:

                              As shown in structure, there are two different types of bonds in formaldehyde,

        (i) C-H Bond

        (ii) C-O Bond

So the electronegativity difference of these bonds are,

(i) C-H Bond

           Electronegativity of Carbon      =  2.5

           Electronegativity of Hydrogen  =  2.1

                                                               _______

           Electronegativity Difference  =       0.4 (non-polar bond)

(ii) C-O Bond

           Electronegativity of Oxygen      =  3.5

           Electronegativity of Carbon       =  2.5

                                                               _______

           Electronegativity Difference  =       1.0   (polar bond)

AMMONIA:

                              As shown in structure, there is one type of bond in ammonia, and that is N-H bond

So the electronegativity difference in this bond is,

N-H Bond

           Electronegativity of Nitrogen      =  3.0

           Electronegativity of Hydrogen    =  2.1

                                                               _______

           Electronegativity Difference  =        0.9   (polar bond)

Answer:

Morphine Sulfate 10 mg/ml solution for injection

Explanation:

Each ml of solution for injection contains 10 mg Morphine Sulfate

This medicine contains a maximum of 3.3 mg of sodium per each 1 ml ampoule.

Answer:

binary fission

Explanation:

Answer:

12

Explanation:

2x6

Answer: 18 moles

Explanation:

 in order to find that u need to take the coefficents of each of the compounds.  that gives a ratio of 2:3.

now we find out how many each unit is: 2x = 12x = 6

now, we multiply it by 3 to find the number of moles of O23(6) = 18 mol O2.  

Answer:

It is less

Explanation:

At low temperatures and pressures, the volume of a real gas is generally smaller compared to the volume of an ideal gas under the same conditions.

This is due to the fact that real gases exhibit intermolecular interactions, such as attractive forces between the gas molecules. These interactions cause the gas particles to be closer together and occupy a smaller volume compared to an ideal gas, which assumes no intermolecular forces and occupies a larger volume.

At low temperatures, the kinetic energy of gas particles decreases, and the intermolecular forces become more significant. This leads to a reduction in the overall volume of the gas as the particles are more closely packed.

Therefore, at low temperatures and pressure, the volume of real gas is smaller than ideal gas.

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Final answer:

To react completely with 4.5 moles of FeO, 81.0 grams of aluminum are required, based on the stoichiometry of the chemical equation and the molar mass of aluminum.

Explanation:

To find out how many grams of aluminum are needed to react completely with 4.5 mol of FeO, we need to first examine the specific reaction between aluminum (Al) and iron(III) oxide (Fe₂O₃). The balanced chemical equation is:

2 Al(s) + 3 FeO(s) → 3 Fe(s) + Al₂O₃(s).

From this equation, we can deduce that 2 moles of Al are needed to completely react with 3 moles of FeO. Therefore, for 4.5 moles of FeO, the molar ratio of Al to FeO (2:3) indicates that (4.5 mol FeO) × (2 mol Al / 3 mol FeO) = 3 mol Al are required.

The molar mass of Al is 27.0 g/mol. To convert moles of Al to grams, we multiply the moles of Al needed by the molar mass of Al:

3 mol Al × 27.0 g/mol = 81.0 g Al.

Thus, 81.0 grams of aluminum are needed to react completely with 4.5 mol of FeO.

A. The kinetic energy of gas particles is higher in hot food than in cold food.

Explanation:

The smell of a hot food moves faster than the smell of a cold food because the kinetic energy of gas particles is higher in hot food than in cold food.

Let us establish that the smell of the food perceived are gases from the food.

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Final answer:

The smell of hot food moves faster than cold food because A. The kinetic energy of gas particles is higher in hot food than in cold food. As temperature increases, particles move faster, spreading the smell more quickly.

Explanation:

The smell of hot food moves faster than the smell of cold food because of the kinetic energy of gas particles. As the temperature of a substance increases, so does the kinetic energy of its particles. Higher kinetic energy results in particles moving faster, which facilitates quicker dispersion of the smell.

Therefore, the correct answer to this question is A. The kinetic energy of gas particles is higher in hot food than in cold food. The kinetic-molecular theory explains that an increase in temperature leads to a greater average kinetic energy of the particles. As a result, the particles in the gas move more rapidly and the scent of hot food diffuses more quickly than that of cold food.

Answer:

The mass of CH4 is 60, 29 grams.

Explanation:

We use the weight of the atoms C and H for calculate the molar mass:

Weight of CH4= weight C+ 4 x weight H= 12,01 g/mol +4 x 1,008g/mol=

Weight of CH4 =16, 042 g/mol

1molCH4-----16, 042grams

3,758 mol CH4--X= (3,758 mol CH4 x 16, 042 grams)/1 mol CH4=60,285836 grams

Answer: 1.15x10²³ molecules C

Explanation: solution attached:

Convert mass of C to moles using its molar mass then multiply to the Avogadro's number.

Hey There !:

Molar mass of H₂O = 18.01 g/mol

Therefore:

1 mol H₂O ----------------- 18.01 g/mol

9.00 moles ---------------- ( mass of H₂O )

mass of H₂O = 9.00 x 18.01 / 1

mass of H₂O = 162.09 / 1

mass of H₂O = 162.09 grams

I hope that it helps !

2 HCl + Ca(oh)2 ---------- CaCl2+ 2 H2O

Answer:

2HCl + Ca(OH)2 -> CaCl2 + 2H2O

Explanation:

This is the balanced equation for this problem the original answer was not balanced properly

Answer: 12.3 g H2O

Explanation: solution attached:

Answer:

radiation

Explanation:

Explanation:

Using the periodic table, to predict the chloride that is ionic or not, we should first understand how ionic compounds are formed.

Ionic compounds are formed between  a highly electronegative element and less electronegative one.

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Answer & Explanation:

As the ball falls towards the ground, its gravitational potential energy is transformed into kinetic energy. The kinetic energy of an object is the energy it possesses due to its motion.

Answer:

all of em

Explanation:

Final answer:

When a fluid cools, the density increases as molecules move closer together due to a decrease in kinetic energy, causing the fluid to sink.

Explanation:

Density of the fluid increases as the temperature decreases and molecules move closer together due to a decrease in kinetic energy, causing the fluid to sink. This phenomenon is observed in various liquids, including water, where as the temperature drops, the density of the liquid increases.

Answer: Disilicon hexabromide ( Si2Br6 )

Explanation: First name the prefix of the first element then the prefix of the second element and change bromine to -ide.

The chemical formula of the covalent compound with 2 silicon and 6 bromine atoms has been [tex]\rm \bold{Si_2Br_6}[/tex].

The chemical formula has been the representation of the chemical compound that has been consisting of the number of atoms of each element that are present in the compound.

The chemical formula has been written with the elemental symbol, having the number of atoms of each element in the subscript.

The given covalent compound has been consisted of:

2 Silicon atoms = [tex]\rm Si_2[/tex]

6 Bromine atoms = [tex]\rm Br_6[/tex]

The chemical formula of the compound has been = [tex]\rm Si_2Br_6[/tex].

The chemical formula of the covalent compound with 2 silicon and 6 bromine atoms has been [tex]\rm \bold{Si_2Br_6}[/tex].

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The answer can be solved using Gay-Lussac's law. Relevant values are plugged into the formula where P1/T1=P2/T2 and solving for P2 yields 0.890 atm.

This is a chemistry problem related to the Gas Law, specifically, Gay-Lussac's law, which states that the pressure of a gas is directly proportional to its temperature, provided its volume remains constant.

Since the problem does not mention a change in volume, we can assume it's constant. The formula for Gay-Lussac's law is P1/T1=P2/T2, where P is the pressure, T is the temperature, and subscripts 1 and 2 refer to the initial and final conditions.

We are given: P1 = 0.750 atm, T1 = 45 C = 318.15 K (converted to Kelvin using the formula K = C + 273.15), and T2 = 105 C = 378.15 K. We are asked to solve for P2.

Plug these values into the formula: (0.750 atm / 318.15 K) = P2 / 378.15 K.  By cross-multiplying and dividing, we solve for P2: P2 = (0.750 atm x 378.15 K) / 318.l5 K = 0.890 atm.

None of the given choices match the calculated answer, suggesting there may be a typo or error in the question.

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Answer: The earth is like a recycling center because as things are being used other organisms can use their waste to live.

Explanation: The cycle is cyclic allowing for the cycle to never end unless things are destroyed.

Earth is compared to a gigantic recycling center due to its natural recycling processes like the water and carbon cycles, and human-driven recycling practices. While recycling reduces environmental impact compared to using primary resources, challenges such as plastic waste remain significant, exemplifying Earth's complex role in managing and recycling its resources.

The Earth can be likened to a gigantic recycling center due to its processes that replicate recycling. Much like a recycling center, the Earth undergoes continuous cycles of using, reusing, and disposing materials. For example, within the water cycle, water is evaporated, condensed, and precipitated repeatedly, ensuring it's continuously recycled. The carbon cycle sees carbon atoms move from atmosphere to plants, to animals, and back to the atmosphere. This demonstrates Earth's natural capacity to recycle nutrients and elements, keeping ecosystems functioning.

Beyond natural cycles, human activities also contribute to Earth's role as a recycler. Material recycling, including metal and paper, has environmental impacts but is still favorable compared to using primary resources. The energy required for recycling metals, especially aluminum, is less than that for extracting and processing the raw materials. Recycling paper saves trees, a vital resource, and maintains biodiversity. However, plastic recycling is less efficient in terms of energy and resource use, so reducing its use is preferable.

Challenges arise when the conversation turns to the sheer volume of waste humans produce, like over 300 million metric tons of plastic annually, some ending up in places like the Great Pacific Garbage Patch. Despite recycling efforts, the quest for waste management solutions persists. These facts showcase Earth's extensive recycling mechanisms, both natural and human-driven.

Answer:

3, the mitochondria has a certain shape and number 3 has the same shape.

Explanation:

Answer: It is number 3

Explanation: I am doing the test right now

Have a good day/night! :)