A rock's mass is a:
A. all of the above
B. chemical property
C. physical property
D. constant property

Magnesium reacts with Phosphorus and produce Magnesium phosphide. The equation is:

Mg + P ---> Mg₃P₂

The balanced equation is:

3 Mg + 2 P ---> Mg₃P₂

It need to have the same amount of atoms of each element on both sides of the equation.

Answer: 3 Mg + 2 P ---> Mg₃P₂

Answer:

63.55

Explanation:

4.500 x 10^5 amu x 1 Cu atom / 63.55 amu = 7081 Cu Atom

Cu 1 x 63.55 = 63.55

Explanation:

Our Direct Nanofiltration (dNF) membranes offer the unique combination of a low fouling hollow fiber configuration with the ability to remove organics and salinity (hardness) from water in one simple step. Other than a strainer, no further pre-treatment is required. We manufacture our membranes with a patented layer-by-layer process, where multiple nano-scale layers are deposited on a membrane support. This method enables very precise and controlled rejection and flux properties of the membrane. A unique solution for troubled water.

The order of increasing ionic property is;

WO3 < ZrS2 < MnS2< ZnS < MnS

Ionic compounds are compounds that contain an ion pair. Typically, ionic compounds are formed between metals and nonmetals.

The degree of ionic character depends on the type of metal involved and the magnitude of charge it carries.

Typically, first row transition metals form ionic compounds. The degree of ionic character depends on the row in which the metal is found and the magnitude of charge it carries.

Hence, the order of ionic character of the compounds from most ionic to least Ionic is; WO3 < ZrS2 < MnS2< ZnS < MnS.

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The total amount of hydrogen gas generated is 9.76 L, under the condition that 15.9 g of hydrochloric acid reacts with excess zine metal.

Furthermore the balanced chemical equation for the reaction between hydrochloric acid and zinc metal is:
2HCl + Zn → ZnCl₂ + H₂
The molar mass of HCl is 36.46 g/mol.
Then, 15.9 g of HCl is equivalent to 15.9 g / 36.46 g/mol = 0.436 mol of HCl.
As per  the balanced chemical equation, 1 mole of HCl reacts with 1 mole of Zn to produce 1 mole of H₂ gas.
Hence, 0.436 mol of HCl will produce 0.436 mol of H₂ gas.
In Stp (Standard Temperature and Pressure), one mole of any gas occupies 22.4 L.
So, 0.436 mol of H₂ gas will occupy:
0.436 mol × 22.4 L/mol = 9.76 L (approx)
Then, approximately 9.76 L of hydrogen gas will be produced when 15.9 g of hydrochloric acid reacts with excess zinc metal at STP.
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Answer:

1. Mg(CH3CO2)2  - magnesium acetate

2. NH4CN - ammonium cyanide

3. NaClO3 - sodium chlorate

To be able to examine different rocks for any desired purpose, such as a foundation rock, road metal, concrete aggregate, construction stones, or roofing material for ornamental purposes, civil engineers must have a thorough understanding of the characteristics of rocks.

The chemical makeup and bonding of minerals affect their physical characteristics. Some traits, like the hardness of a mineral, are more helpful for mineral identification.

Blocks of stone are used for foundations, walls, bridge piers, abutments, lighthouses, aqueducts, and retaining walls in civil and highway engineering. For masonry construction, lintels, and the vertical columns that support the building's floors, rocks are employed.

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The statement that best explains why the chemical equation provided for combustion of methane supports law of conservation of mass is as follows: There is same number of each kind of atom before and after the chemical reaction and the total mass remains the same (option D).

The law of conservation of mass is a conservation law that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.

The law of conservation of mass further explains that in a chemical reaction, the amount of each atom on both sides of the equation is the same.

According to this question, methane gets combusted in air. To fulfill the law of conservation of mass, the same number of each kind of atom before and after the chemical reaction and the total mass remains the same.

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Answer:

4.20 moles NF₃

Explanation:

To convert between moles of N₂ and NF₃, you need to use the mole-to-mole ratio from the balanced equation. This ratio consists of the coefficients of both molecules from the balanced equation. The molecule you are converting from (N₂) should be in the denominator of the ratio because this allows for the cancellation of units. The final answer should have 3 sig figs because the given value (2.10 moles) has 3 sig figs.

1 N₂ + 3 F₂ ---> 2 NF₃

2.10 moles N₂        2 moles NF₃
---------------------  x  ---------------------  =  4.20 moles NF₃
                                  1 mole N₂

Answer:

No question is being asked here.

Explanation:

If looking for the moles or grams of nitrogen gas you would have to use the ideal gas law: PV=nRT. If the movable piston moves and you are given more measurements you would use the combined gas law P1V1/T1=P2V2/T2

Answer:

A

Explanation:

it has a methyl group, ethyl group and amine group

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms.

The correct IUPAC name for the structure shown in the provided image is "ethylamine." The structure consists of a central nitrogen atom bonded to two carbon atoms. According to the IUPAC naming rules, the longest carbon chain is selected as the parent chain, which in this case consists of two carbon atoms. The substituent attached to the parent chain is an ethyl group, denoted as "C2H5". The amine functional group, which consists of the nitrogen atom, is named as "amine". Since there is only one amine group attached to the carbon chain, it is referred to as "ethylamine." Therefore, option C) "ethylamine" is the correct IUPAC name for the given structure.
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The kJ of the energy absorbed for the every mole of the carbon reacted is 104.8 kJ.

The chemical equation is as :

2C + 2H ---> C₂H₄   ,     ΔH = + 52.4 kJ/mol

The ΔH is the enthalpy change that is determined by the subtracting the energy of the reactants to the products.

The  ΔH = energy of the products - energy of the reactants

The expression for the energy is as :

q = n ΔH

Where,

n = number of the moles

ΔH = enthalpy change

The kJ of the energy absorbed for the every mole of the carbon reacted :

q = 2 mol × 52.4 kJ/mol

q = 104.8 kJ

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer: acid

Explanation:

Answer:

A) Acid

Explanation:

I got the same question and answered correctly

The highlighted apparatus are;

1) stirring rod

2) crucible

The term chemical reaction refers to the process by which two or more substances are combined to form a product. The product may look like or different from the reactants that were combined to produce it.

Now we can see the set up that was used as shown for the reaction of  dilute nitric acid with lead(II) oxide to prepare lead(II) nitrate.

The highlighted apparatus are;

1) stirring rod

2) crucible

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The following steps can be taken

Answer:

If there is a zero between two non-zero digits then it is also a significant figure. For example; 4.5006 have five significant figures. Zeroes at the end or on the right side of the number are also significant. For example; 0.500 has three significant figures.The number of significant figures in a number use the following 3 rules: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.

Conjugate acid-base pair is the combination of two compounds which can accept and donate hydrogen ions.

The compounds are HCI, H₂SO₄, HPO, Acetic acid, Formic Acid, HF, carbonic acid, ammonium ion, water, nitric acid.

a.

Conjugate bases of HCl is Cl⁻.

Conjugate bases of H₂SO₄ is HSO₄⁻.

Conjugate bases of HPO₄²⁻ is PO₄³⁻.

Conjugate bases of CH₃COOH is CH₃COO⁻.

Conjugate bases of formic acid is formate ion.

Conjugate bases of HF is F⁻.

Conjugate bases of carbonic acid is the bicarbonate.

Conjugate bases of ammonium ion ammonia.

Conjugate bases of water is H₃O⁺.

Conjugate bases of HNO₃ is NO₃⁻.

b.

HCl ⇄ H⁺ + Cl⁻

H₂SO₄ ⇄ 2H⁺ + SO₄²⁻

H₃PO₄ ⇄ H⁺ + PO₄³

CH₃COOH ⇄ H⁺ + CH₃COO⁻

HCOOH ⇄ H⁺ + HCOO⁻

HF ⇄ H⁺ + F⁻

H₂CO₃ + H₂O ⇄ HCO₃⁻ + H₃O⁺

Ammonia does not ionizes in water.

H₂O ⇄ H₃O⁺ + OH⁻

HNO₃ ⇄ H⁺ + NO₃⁻

c.

Strong acids: HCl, H₂SO₄, HNO₃,

Weak acids: H₃PO₄, CH₃COOH, HCOOH, HF, H₂CO₃, ammonium ion

Water is both weak and strong acid.

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Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.

Answer:

the attractive forces keep the particles together tightly enough so that the particles do not move past each other.

Explanation:

In the solid the particles vibrate in place.

Answer: The answer is actually competition

Explanation:

So she plants the flowers, then ignores them, not taking care of them. So when the weeds start to grow, and if they aren't pulled out, they start to steal the water from the flowers. So the flowers would try to take it back, but the weeds, because Samantha isn't taking care of them and pulling them out, keep growing. This lets the weeds take more water, causing the flowers to die.

Solution :

The partition coefficient

\($k_d= \frac{\text{(mass of caffeine in }CH_2Cl_2 / \text{volume of }CH_2Cl_2)}{\text{(mass of caffeine in water/ volume of water)}}$\)

   = 9.0

A). 1 x 200 mL extraction

Let m be the mass of caffeine in water

Mass of caffeine in \($CH_2Cl_2$\) = 100 - m

∴ \($\frac{(100-m)/200}{m/200}=9$\)

  \($\frac{100-m}{m}=9$\)

  \($10 \ m = 100$\)

\($m=\frac{100}{10}$\)

     = 10

Therefore, the mass remaining in the coffee is m = 10 mg

B). 2 x 100 mL extraction

First extraction :

Let \($m_1$\) be the mass of the caffeine in water.

Mass of caffeine in \($CH_2Cl_2$\) = 100 - m

∴ \($\frac{(100-m_1)/100}{m_1/200}=9$\)

  \($\frac{100-m_1}{m_1}=9$\)

  \($5.5 \ m_1 = 100$\)

\($m_1=\frac{100}{5.5}$\)

     = 18.18

Mass remaining in the coffee after the 1st extraction \($m_1$\) = 18.18 mg

Second extraction:

Let \($m_2$\) be the mass of the caffeine in water.

Mass of caffeine in \($CH_2Cl_2$\) = 18.18 - \($m_2$\)

∴ \($\frac{(18.18-m_2)/100}{m_2/200}=9$\)

  \($\frac{18.18-m_2}{m_2}=9$\)

  \($5.5 \ m_2 = 18.18$\)

\($m_1=\frac{18.18}{5.5}$\)

     = 3.3

Mass remaining in the coffee after the 1st extraction \($m_2$\) = 3.3 mg

Types of luminous flames:

1. Yellow Luminous Flame

2. Smoky Luminous Flame

3. Orange Luminous Flame

4. Blue Luminous Flame

Luminous flames are characterized by their visible glow, which is caused by the incomplete combustion of fuel. The presence of soot particles in the flame causes the emission of light. There are different types of luminous flames, which can be classified based on their fuel composition and burning conditions. Here are some common types of luminous flames:

1. Yellow Luminous Flame: This is the most common type of luminous flame, often seen in open fires, candles, and gas stoves. It appears yellow due to the presence of soot particles in the flame. Yellow flames indicate incomplete combustion of hydrocarbon fuels, such as methane, propane, or natural gas. The high carbon content in these fuels leads to the formation of soot, which emits visible light.

2. Smoky Luminous Flame: This type of flame is characterized by a significant amount of black smoke and soot production. It is commonly observed in poorly adjusted or malfunctioning burners or engines. The excessive presence of unburned fuel in the flame results in incomplete combustion and the emission of dark smoke particles.

3. Orange Luminous Flame: An orange flame indicates a higher combustion temperature compared to a yellow flame. It is often seen in more efficient burners or when burning fuels with a higher carbon content, such as oil or diesel. The higher temperature helps in burning more of the carbon particles, reducing the amount of soot and making the flame appear less yellow.

4. Blue Luminous Flame: A blue flame is typically associated with complete combustion. It indicates efficient burning of fuel, resulting in minimal soot formation. Blue flames are commonly observed in gas burners or Bunsen burners. The blue color is a result of the combustion of gases, such as methane, in the presence of sufficient oxygen.

It's important to note that the luminosity of a flame can vary depending on factors such as fuel-air mixture, combustion temperature, and the presence of impurities. Achieving complete combustion and minimizing the production of soot is desirable for efficient and cleaner burning processes.

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Answer:

N₂ + 3H₂ → 2NH3

4Fe + 2Cl₂ → 4FeCl

Explanation:

This equations are now balanced

pls rate as brainliest

Answer: 0.85 hertz

Explanation: Calculator said so also 0.85 is decimal form for 85

Answer:

Water when it freezes into ice

Explanation:

Most liquids expand when heated and contract when cooled, water behaves in an anomalous fashion. Water rather expands when cooled and contracts when heated.

Water usually contracts on cooling from any temperature until 4°C, after 4°C, the water begins to expand rapidly. Hence water has its least volume at 4°C and increases rapidly afterwards.

Thus the largest volume change for water occurs during freezing since it expands when cooled.

The heat of reaction, or enthalpy of reaction, for a chemical reaction is the change in enthalpy that occurs when a certain number of reactants are converted to products. It is denoted by ∆H and is defined as the enthalpy of the products minus the enthalpy of the reactants.

To calculate the heat of reaction for the given reaction, we can use the following equation:

∆H = ∑nH°(products) - ∑nH°(reactants)

where ∑n is the sum of the stoichiometric coefficients of the reactants and products, and H° is the standard enthalpy of formation of the species.

The standard enthalpy of formation of a species is the enthalpy change that occurs when 1 mole of the species is formed from its elements in their standard states. It is denoted by H°f and is defined as the enthalpy of the species minus the sum of the enthalpies of the elements in their standard states.

For the given reaction, we can calculate the heat of reaction as follows:

∆H = (2 CO + 4 H₂O) - (2 CH₄ + 3 O₂)

= (2 CO + 4 H₂O - 2 CH₄ - 3 O₂)

= (2 CO - 2 CH₄ + 4 H₂O - 3 O₂)

= 2(H°f(CO) - H°f(C) - H°f(H₂)) + 4(H°f(H₂O) - H°f(H) - H°f(O)) - 3(H°f(O₂) - 2H°f(O))

= 2(-110.5 kJ/mol - 0 kJ/mol - 0 kJ/mol) + 4(-285.8 kJ/mol - 0 kJ/mol - 0 kJ/mol) - 3(-493.5 kJ/mol - 2(-0 kJ/mol))

=∆H = 2(-110.5 kJ/mol - 0 kJ/mol - 0 kJ/mol) + 4(-285.8 kJ/mol - 0 kJ/mol - 0 kJ/mol) - 3(-493.5 kJ/mol - 2(-0 kJ/mol))

= 2(-110.5 kJ/mol) + 4(-285.8 kJ/mol) - 3(-493.5 kJ/mol)

= (-221 kJ/mol) + (-1143.2 kJ/mol) - (-1480.5 kJ/mol)

= (-221 kJ/mol) + (-1143.2 kJ/mol) + 1480.5 kJ/mol

= (-221 kJ/mol) + (-1143.2 kJ/mol) + 1480.5 kJ/mol

= (-221 kJ/mol) + (-1143.2 kJ/mol) + 1480.5 kJ/mol

= (-221 kJ/mol) + (-1143.2 kJ/mol) + 1480.5 kJ/mol

= (-221 k

An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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