What is the coefficient?
A. A whole number that appears in front of a compound or element in a balanced chemical equation.
B. A whole number that appears as a subscript in front of a formula in a balanced chemical equation
C. A whole number that appears as a subscript at the end of a formula in a balanced chemical equation.
D. A whole number that appears as a subscript at the end of a formula in a balanced chemical equation

Explanation:

Biotic factor affect an organisms survival

The biotic factors in an ecosystem are the living organisms, such as animals. Biotic factors in an ecosystem are the participants in the food web, and they rely on each other for survival. These living organisms affect each other and influence the health of the ecosystem.

Abiotic factor affect an organisms survival

Abiotic factors are all of the non-living things in an ecosystem. Both biotic and abiotic factors are related to each other in an ecosystem, and if one factor is changed or removed, it can affect the entire ecosystem. Abiotic factors are especially important because they directly affect how organisms survive.

Answer:

120g

Explanation:

Step 1:

We'll begin by writing the balanced equation for the reaction.

Sn + 2HF —> SnF2 + H2

Step 2:

Determination of the number of mole HF needed to react with 3 moles of Sn.

From the balanced equation above,

1 mole of Sn and reacted with 2 moles of HF.

Therefore, 3 moles Sn will react with = 3 x 2 = 6 moles of HF.

Step 3:

Conversion of 6 moles of HF to grams.

Number of mole HF = 6 moles

Molar Mass of HF = 1 + 19 = 20g/mol

Mass of HF =..?

Mass = number of mole x molar Mass

Mass of HF = 6 x 20

Mass of HF = 120g

Therefore, 120g of HF is needed to react with 3 moles of Sn.

To calculate the temperature increase, use the heat equation q = m × c × ΔT. Given that 15.4 g of silver absorb 332 J and the specific heat is 0.24 J/g°C, solving for ΔT yields a temperature increase of approximately 89.8°C.

To calculate how much the temperature of the silver will increase when it absorbs heat, you can use the formula:

q = m × c × ΔT

where

We can rearrange the formula to solve for ΔT (change in temperature):

ΔT = q / (m × c)

In this case

Therefore, the change in temperature is:

ΔT = 332 J / (15.4 g × 0.24 J/g°C) = 332 J / (3.696 J/°C) ≈ 89.8°C

The temperature of the silver will increase by approximately 89.8°C.

A child complains that his soup is too hot. His mother places an ice cube in the soup to cool it.

How will the soup's thermal energy behave?

Answer:

It will flow from the soup to the ice cube

Explanation:

When an ice cube with low thermal energy is in a hand that has higher thermal energy, thermal energy will flow from the hand to the ice cube in the form of heat.

Answer:

B. It will flow from the soup to the ice cube

Explanation:

Answer:

B

Explanation:

A characteristic of members of the domain Bacteria is that they: C. lack a nucleus in their cells.

A cell can be defined as the fundamental, functional, structural and smallest unit of life, which is primarily found in all living organisms.

Basically, all living organisms are broadly classified into two (2) main categories according to their cell type and these are;

The domain Bacteria are generally prokaryotes, which means that they are prokaryotic cells with bacterial rRNA but no nuclear membrane.

In conclusion, all members of the domain Bacteria lack a nucleus in their cells.

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Answer: C. Quart

Explanation:

Quart is a unit of measurement for liquids and is equivalent to 2 pints.

Quart is a unit which is used rarely if ever in science labs.

Units are used in measurement and have a definite magnitude which is defined and adopted by law and is used as a standard for measurement of same kind of quantity. Any other quantity of the same  kind  is expressed as a multiple of unit of the measurement.

There are many system of units which are common out of which International System of units  is the modern form of the metric system.

The fields of science, engineering  make use of units  which aids researchers in problem solving . The system of units varies from country to country  and the different system of units are SI system,MKS system and CGS system .

Centimeter, gram and millimeter are SI units which are used in science labs while quart is a non-SI unit and is not oftenly used in labs.

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Answer:

Kinetic energy, [tex]K=2.53\times 10^6\ J[/tex]

Explanation:

We have,

Mass of the truck is 2500 kg. It is moving with a speed of 45 m/s.

It is required to find the kinetic energy acting on the truck. As it is moving with some velocity, it will have kinetic energy. The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex], m is mass and v is velocity

[tex]K=\dfrac{1}{2}\times 2500\times 45^2\\\\K=2.53\times 10^6\ J[/tex]

So, the kinetic energy of the truck is [tex]2.53\times 10^6\ J[/tex].

Answer: 1.0 mole of sodium

Explanation:

40.0 g NaOH  x __1 mol__ x __2 mol Na__ = 1 mol of Na

                            39.999 g      2 mol NaOH

Answer:

the answer is (WIND) trust me its right good luck on the test

Explanation:

Answer:loss of electrons

Explanation:

The change occurring at the anode in an operating electrochemical cell is the loss of electrons [4 ] , which is called oxidation. This is in contrast to the cathode, where reduction occurs and electrons are gained.  Option 4 is correct .

In an operating electrochemical cell, the change that occurs at the anode is the loss of electrons. This process is known as oxidation. Remember that oxidation can be easily recalled using the mnemonic 'OIL RIG' which stands for Oxidation Is Loss, Reduction Is Gain of electrons. Therefore, the correct option from the provided choices would be 4: loss of electrons.

To give a practical example, consider a zinc electrode undergoing oxidation in a voltaic cell. Here, zinc atoms at the anode lose electrons to become zinc ions (Zn²⁺). This can be represented by the half-reaction Zn(s) ⇒ Zn²⁺ (aq) + 2e
The released electrons then travel through an external circuit to reach the cathode.

Furthermore, in the process of reduction, occurring at the cathode, copper ions (Cu²⁺) in the solution gain electrons to become solid copper (Cu). This indicates that while the anode loses electrons, the cathode gains them, completing the circuit and allowing the cell to do work.

Answer:

When water droplets get too heavy.

Explanation:

Hope this helps.

Answer:

when the ☁ cant hold no more rain

Explanation:

Answer:

a) 171

Explanation:

We can find the mass (in grams) of a sample by multiplying the amount of moles by the molar mass.

In this case, we know we have 0.500-mol and would multiply it by the molar mass, 342.3g/mol, to give us the answer of 171.15g rounded down to 171g.

Equation: 0.500mol x 342.3g/mol = 171.15g

Answer:

171

Explanation:

Edg

Answer:

Molar mass = 102.5 g/mol

Density = 4.19 g/L

Explanation:

To find the molar mass, we first need to find how many moles are in the sample. To do this, we can use the PV=nRT equation.

P = 600 torr * (1 atm/760 torr) = 0.79 atm

V = .1 L

n = this is the number of moles and what you are solving for

R = gas constant = 0.08206 L*atm/moles*K

T = 140 C + 273 = 413 K

Plug these values into the PV=nRT equation:

n = (.1 L*.79 atm)/(0.08206*413 K)/

n = .00233 moles

To find the molar mass divide the grams by the moles

0.239 g / .00233 moles = 102.5 g/mol

For the second part of the problem, you need to use this equation:

d (denstiy) = (P*molar mass)/ R*T

d = (1 atm * 102.5 g/mol) / (.08206*298 K)

d = 4.19 g/L

The molar mass of the halogen gas is 12.39 g/mol. The density of the gas at 1.00 atm and 298 K is 0.505 g/L.

a. To calculate the molar mass of the halogen gas, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, let's convert the temperature from Celsius to Kelvin:

T = 140 °C + 273.15 = 413.15 K

Next, let's convert the pressure from Torr to atm:

P = 600.0 Torr / 760.0 Torr/atm = 0.7895 atm

Now, let's rearrange the ideal gas law equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

n = (0.7895 atm * 0.1000 L) / (0.0821 atm L/mol K * 413.15 K)

n = 0.01928 mol

Finally, let's calculate the molar mass by dividing the mass of the sample by the number of moles:

Molar mass = 0.239 g / 0.01928 mol = 12.39 g/mol

b. The density of a gas can be calculated using the ideal gas law equation:

density = (molar mass * pressure) / (gas constant * temperature)

Using the given values:

density = (12.39 g/mol * 1.00 atm) / (0.0821 atm L/mol K * 298 K)

density = 0.505 g/L

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Final answer:

The greatest biodiversity is found in environments with a wide variety of ecosystems, especially in the tropics. Biodiversity, which includes all life forms and ecosystems, is crucial for ecological balance and human well-being. Despite its importance, biodiversity is at risk due to inadequate knowledge and human activities.

Explanation:

The environment with the greatest biodiversity is the one with the greatest variety of ecosystems. Biodiversity encompasses all of the variety of life that exists on Earth, including the diversity of genes, species, and ecosystems. It's well-documented that biodiversity is highest in the tropics, which is home to numerous endemic species and biodiversity hotspots. The variety of ecosystems ranging from coral reefs to prairies contributes to this richness in species. Yet, despite the high biodiversity in such regions, there is also a significant risk of biodiversity loss due to limited knowledge about these species and the impact of human activity.

The importance of biodiversity extends beyond the ecological realm and significantly affects human health and agriculture. A diverse array of species contributes to the robustness of ecosystems, which is essential for the survival and welfare of human populations. The loss of biodiversity can upset the interconnectedness of species, leading to detrimental impacts on the environment and human societies.

Answer:

It is traveling at 170 miles per hour.

Explanation:

divide 340 by 2 because right now it's at 340 miles per two hours.

You get 170 miles per hour.

A racing car travels 340 miles in 120 minutes. The speed travelled by the car are 2.83 Miles / minutes.

Speed is defined as a measurement of the length of time it takes for an object to travel a certain distance. The amount of something that happens or changes in a unit of time is referred to as its rate. You can determine an object's speed if you know how far it moves in a specific amount of time. The distance an object travels in a given amount of time is its speed.

Speed can be expressed as

Speed = Distance / Time

Given, Distance = 340 miles

Time = 120 minutes

Speed = 340 miles / 120 minutes

Speed  = 2.83 Miles / minutes

Thus, a racing car travels 340 miles in 120 minutes. The speed travelled by the car are 2.83 Miles / minutes.

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Answer:

d

Explanation:

The distance between the planet earth and the sun compared with the distances between the planet Earth and other stars is the Sun is many thousands of times closer to Earth than any other star. The correct option is D.

In one year, the Earth completes its orbit around the Sun. The plane of the Earth's route around the Sun has a slope on its rotation axis. As the Earth revolves around the Sun, this angle of the Earth is affected by the seasons. All planetary growth is supported by the energy provided by the Sun.

We are moving away from the Sun extremely slowly due to a certain impact. That is how the Sun and the Earth interact tidally. The Earth is pushed further away from the Sun as a result of the Sun's revolution slowing down. You may read more about tides and how the Earth-Moon system affects them here.

Therefore, the correct option is D. The Sun is many thousands of times closer to Earth than any other star.

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Answer:

Vector

Explanation:

A measurement that includes both magnitude and direction is called a vector. It's a quantity fully defined by these two properties. Examples are force, velocity, and displacement.

Any measurement that includes both magnitude and direction is called a vector. A vector is a quantity that is fully explained by both direction and magnitude. For instance, force is a good example of a vector because it includes information about the intensity of force (magnitude) and the direction in which it's applied. Other examples of vectors include velocity and displacement.

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Answer: The new pressure if the temperature is kept constant is 1.5 atm

Explanation:

To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.

The equation given by this law is:

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1\text{ and }V_1[/tex] are initial pressure and volume.

[tex]P_2\text{ and }V_2[/tex] are final pressure and volume.

We are given:

[tex]P_1=1atm\\V_1=750mL\\P_2=?\\V_2=500mL[/tex]

Putting values in above equation, we get:

[tex]1\times 750mL=P_2\times 500mL\\\\P_2=1.5atm[/tex]

Thus new pressure if the temperature is kept constant is 1.5 atm

To compress nitrogen at 1 atm from 750 mL to 500 ml, while keeping the temperature constant, the new pressure must be 1.5 atm. This is calculated using Boyle's Law, which states that the pressure and volume of a gas have an inverse relationship when the temperature is held constant.

To solve this problem, we need to use Boyle's Law, which states that the pressure and volume of a gas have an inverse relationship when the temperature is kept constant. This means if you increase the volume, the pressure decreases and vice versa. The formula for Boyle's Law is P1V1 = P2V2.

In this problem: P1 = initial pressure = 1 atm. V1 = initial volume = 750 mL. V2 = final volume = 500 mL. We are asked to find P2 (final pressure).

Using Boyle's Law (P1V1 = P2V2), we can set up our equation like this: 1 atm * 750 mL = P2 * 500 mL. Solving for P2, we find that P2 = (1 atm * 750 mL) / 500 mL = 1.5 atm.

So, to compress nitrogen at 1 atm from 750 mL to 500 ml, the new pressure must be 1.5 atm when the temperature is kept constant.

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Answer:

a and c on edge

Explanation:

Answer:

A- It represents a reaction that involves rearrangement of atoms.

B- It represents a reaction in which hydrogen electrons and oxygen electrons undergo change.

Answer:

Da Answer

Explanation:

Ionic bonds formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal.

An ionic compound is typically formed between a metal, which becomes a cation, and a nonmetal, which becomes an anion. The ions are held together by electrostatic attractions known as ionic bonds, producing a neutral compound.

An ionic compound is typically formed between a metal and a nonmetal. This occurs when the metal atom loses one or more electrons, forming a positively charged ion known as a cation, while the nonmetal atom gains those electrons, forming a negatively charged ion known as an anion. The resulting ionic compound is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions.

For example, sodium metal (Na), which is from group 1 of the periodic table, tends to lose one electron and become a sodium cation (Na+). Chlorine gas (Cl2), from group 17 of the periodic table, can accept one electron to form two chloride anions (Cl-). When these ions combine, they form sodium chloride (NaCl), where each sodium ion is paired with a chloride ion, making the compound neutral as a whole, with a zero net charge.

Answer:

If there are resource shortages, many species (not just humans) may not have the things they need to survive, and can result in conflicts.

Explanation:

Answer:

CO₃²⁻ + Ca²⁺ → CaCO₃(s)

Explanation:

In a net ionic equation there are listed just the ions that are involved in the reaction.

For the reaction:

Na₂CO₃(aq) + Ca(NO₃)₂(aq) → 2NaNO₃(aq) + CaCO₃(s)

Ions are:

2 Na⁺ + CO₃²⁻ + Ca²⁺ + 2 NO₃⁻ → 2 Na⁺ + 2 NO₃⁻ +  CaCO₃(s)

Thus, ions that react are just CO₃²⁻ and Ca²⁺ and net ionic equation is:

CO₃²⁻ + Ca²⁺ → CaCO₃(s)

The net ionic equation for the reaction between Na2CO3 and Ca(NO3)2, removing the spectator ions, is 2Na+ + CO32- + Ca2+ → CaCO3 + 2Na+.

You were asked to write the net ionic equation for the reaction that occurs when solutions of Na2CO3 and Ca(NO3)2 are mixed. The net ionic equation only includes those substances and ions in the ionic compounds that undergo a chemical change. In this case, they are the ions that combine to form the precipitate CaCO3.

The net ionic equation removes any spectator ions (ions that do not participate directly in the reaction but exist in the solution). In this reaction, the nitrate ions (NO3-) and the sodium ions (Na+) are the spectator ions, as they remain in the solution and do not form a part of the precipitate.

Therefore, the net ionic equation is: 2Na+ + CO32- + Ca2+ → CaCO3 + 2Na+

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Answer:

Zero point five Molar solutions

Explanation:

In chemistry, there are units for expression the concentration of a solution. The concentration of a solution is defined as the amount of solute present in a given volume of solvent. There are diverse units of concentration recognized in chemistry with each one written in its own unique way and with its own unique symbols. Some concentration units are even expressed in percentage.

However, molar concentration is shown as M (upper case letter M). This unit is alternatively written as molL-1. When we write 0.5 M, we pronounce it as zero point five molar.

Answer:

Explanation:

Because the powder has more finer and larger surface area hence it absorbed faster and it becomes more effective in performance compared to the tablet that will still need to be dissolved before it is been assimilated into the body system.

D is the answer to the question.

Answer: 8.33 mol of HCl (Hydrochloric Acid)

Explanation:

150 g H2O  x __1 mol__ x __1 mol HCl__  =  8.33 mol of HCl

                         18.016 g        1 mol H2O

The combination of K1+ (potassium ion) and NO1-2 (nitrate ion) results in the formation of a stable compound with the formula KNO3.

The combination of the ionic species K1+ (potassium ion) and NO1-2 (nitrate ion) results in the formation of a stable compound through ionic bonding. The chemical formula for this compound is KNO3.

In KNO3, the potassium ion (K1+) donates one electron to the nitrate ion (NO1-2), forming a positively charged potassium ion and a negatively charged nitrate ion. The ionic bond between them is strong and results in the overall neutral charge of the compound.

Potassium nitrate (KNO3) is a well-known salt with various applications. It is commonly used in fertilizers, food preservation, and the manufacturing of fireworks. The balanced formula reflects the conservation of charge in the chemical reaction, ensuring that the total positive charge from potassium ions is equal to the total negative charge from nitrate ions.

In summary, the correct formula for the compound formed by the combination of K1+ and NO1-2 ions is KNO3, where the potassium ion and nitrate ion combine through ionic bonding to create a stable, electrically neutral compound.

Final answer:

The combination of potassium  and nitrite nitrite  forms the ionic compound KNO2, which is known as potassium nitrite.When combining these two nitrite , it is essential to balance the charges to form a neutral compound.

Explanation:

The correct formula that would result from the combination of the ionic species potassium and nitrite  is KNO2. To write the formula of an ionic compound, the total positive charge must balance the total negative charge. When a metal reacts with a non-metal, the electrons that are in the metal are transferred to the non-metal which then forms an ion. The compound in the results is called an ionic compound. Because potassium has a charge of 1+ and nitrite has a charge of 1−, they combine in a 1:1 ratio to form potassium nitrite.

nonpolar covalent bond (with LD force)