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Answer:

a

Explanation:

The force acting downwards or opposite to normal force which reduces the movement is indicated with a negative sign. Hence, the force of -7N is frictional force.

Force is an external agent acts on a body to change it from the state of rest or motion. There are various forces such as frictional force, magnetic force, gravitational force etc.

Frictional force is the resistive force which make the object resistive in motion. Thus it is indicated with a negative sign. Gravitational force is the force by which an object attracts other objects into its centre of mass.

Hence, gravitational force also making the body resistive to motion. Here, -10 N is the gravitational force acting on the box and it experience a force of -7N which also resists its force in the opposite direction of the normal force.

Hence, -7N is the force of  friction acting on the body.

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Answer:

Melting

Explanation:

Answer:

that the polar bear will come out again in 2 years

For a neutralization reaction, more heat is evolved and Q is doubled.

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Complete question:

A ball with a weight of 0.5 kg is sitting on a shelf that is 3 meters high. What is the gravitational potential energy of the ball ?

Help me! This is 8th grade sci btw

Answer:

the gravitational potential energy of the ball is is 14.7 J.

Explanation:

mass of the ball, m = 0.5 kg

height above the ground on which the ball is sitting, h = 3 m

The gravitational potential energy of the ball is calculated as follows;

P.E = mgh

P.E = 0.5 x 9.8 x 3

P.E = 14.7 J

Therefore, the gravitational potential energy of the ball is is 14.7 J.

To prevent more than one sperm from entering the egg.

What is oocyte?

An oocyte , or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis, forming oogonia. During oogenesis, the oogonia become primary oocytes. An oocyte is a form of genetic material that can be collected for cryoconservation.

When the sperm and egg fuse it triggers a release of calcium ions, which cause the cortical granules inside the egg to fuse with the plasma membrane. As they fuse, these granules release their contents outside of the cell, toward the remains of the zona pellucida.

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About 0.0288 g of HCl is required to b added to 500 grams of distilled water to make a solution of pH 2.8.

To find the amount of HCl to be added in distilled water, we follow these steps,

Step 1: Calculate the concentration of H⁺ ions in the solution using the pH.

pH = -log[H⁺]

2.8 = -log[H⁺]

[H⁺] = 1.58 × 10⁻³ M

Step 2: Write the balanced chemical equation for the dissociation of HCl in water and determine the mole ratio of HCl to H⁺ ions.

HCl + H₂O → H₃O⁺ + Cl⁻

The mole ratio of HCl to H⁺ ions is 1:1.

Step 3: Calculate the moles of H⁺ ions in the solution.

moles of H⁺ = [H⁺] × volume of solution

moles of H⁺ = (1.58 × 10⁻³ M) × 0.5 L

moles of H⁺ = 7.90 × 10⁻⁴ mol

Step 4: Calculate the moles of HCl needed to produce the desired amount of H⁺ ions.

moles of HCl = moles of H⁺

moles of HCl = 7.90 × 10⁻⁴ mol

Step 5: Calculate the mass of HCl needed using its molar mass.

mass of HCl = moles of HCl × molar mass of HCl

mass of HCl = (7.90 × 10⁻⁴ mol) × (36.46 g/mol)

mass of HCl = 0.0288 g

Therefore, approximately 0.0288 g of HCl needs to be dissolved in 500.0 mL of distilled water to create a solution with a pH of 2.8.

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Complete question - How much HCl (in grams) needs to be dissolved in 500.0 mL of distilled water to create a solution with a ph of 2.8.

The volume, in l, of 10.0 m hcl needed to make 2.00 l of 2.00 m hcl solution by dilution with water is 0.400 L. The correct answer is option b (0.400 L).

To make a 2.00 M HCl solution by diluting 10.0 M HCl, we can use the formula:

M1V1 = M2V2 ,where M1 is the initial concentration (10.0 M), V1 is the initial volume (unknown), M2 is the final concentration (2.00 M), and V2 is the final volume (2.00 L).

Rearranging this equation to solve for V1, we get:

V1 = (M2V2) / M1

Plugging in the values, we get:

V1 = (2.00 M x 2.00 L) / 10.0 M

V1 = 0.400 L

Therefore, the volume of 10.0 M HCl needed to make 2.00 L of 2.00 M HCl solution by dilution with water is 0.400 L.

Dilution is defined as the process of adding more solvent to a solution. When diluting a solution, the concentration of the solute is reduced. It's important to note that when diluting a solution, the number of moles of the solute remains the same.

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Only 1% of the wavelengths of visible light are absorbed by photosynthetic pigments. Photosynthesis is the process by which plants convert sunlight into usable chemical energy in the form of glucose.

However, not all wavelengths of light are equally effective at driving photosynthesis. In fact, plants are only able to use a narrow range of wavelengths that fall within the visible spectrum (400-700 nm). This is because the pigments in chloroplasts have evolved to absorb light within this range, while reflecting or transmitting light outside of it. Furthermore, the efficiency with which plants are able to convert absorbed light energy into chemical energy is relatively low. This is due to a number of factors, including losses of energy through heat dissipation, photorespiration, and inefficiencies in the carbon fixation process.

As a result, only a small fraction of the total solar radiation that strikes a plant is ultimately converted into usable chemical energy. While the exact percentage may vary depending on a variety of factors (e.g. plant species, environmental conditions), it is generally estimated to be around 1%. In contrast, a significant portion of the solar radiation that strikes a plant is either reflected or absorbed as heat energy. This is because most plant surfaces (e.g. leaves, stems) have a high albedo, or reflectivity, which causes much of the incident radiation to bounce back into the environment. Additionally, some solar energy is absorbed by non-photosynthetic tissues such as the plant's woody stem or soil. In summary, the low conversion efficiency of photosynthesis and the limited range of wavelengths that can be absorbed by chloroplasts are the main reasons why only a small fraction of the solar radiation that strikes a plant is converted into usable chemical energy.

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Answer:Graduated Cylinder

Explanation:

You use the water displacement test to find the volume of irregular shaped objects.

Answer:

Graduated Cylinder

Answer:

The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way

Explanation:

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This equation represents the solid iron (Fe) reacting with the aqueous copper(II) nitrate (Cu(NO3)2) solution to produce aqueous iron(II) nitrate (Fe(NO3)2) and solid copper (Cu).

In this situation, a chemical reaction does occur between iron (Fe) and copper(II) nitrate (Cu(NO3)2). The iron reacts with the copper(II) ions in the solution to form iron(II) ions and copper metal.

The balanced chemical equation for the reaction is:

Fe(s) + Cu(NO3)2(aq) → Fe(NO3)2(aq) + Cu(s)

This equation represents the solid iron (Fe) reacting with the aqueous copper(II) nitrate (Cu(NO3)2) solution to produce aqueous iron(II) nitrate (Fe(NO3)2) and solid copper (Cu).

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The minimum number of components needed to describe this system is 2 i.e Magnesium and Iron.

The minimum number of components needed to describe a system is determined by the number of independent chemical species. In this case, the system consists of two solid solutions, olivine and orthopyroxene, each of which can vary in composition between Mg2SiO4 and Fe2SiO4, and between MgSiO3 and FeSiO3, respectively.

To describe the composition of each solid solution, we need two components: Mg and Fe.

Olivine is a mineral that belongs to the nesosilicate group, which is a type of silicate mineral. It is commonly found in igneous rocks such as basalt and gabbro. Olivine is typically green in color and has a glassy luster.

Orthopyroxene is a group of silicate minerals that are commonly found in igneous and metamorphic rocks. It is usually green to brown in color and has a prismatic or tabular crystal habit.

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The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

B. Ca

Explanation:

Let's look at the electron configurations of all four elements (I am going to write it in noble gas configuration to make it simpler):

Mg electron configuration: [Ne]3s2

Ca electron configuration: [Ar]4s2

Ar electron configuration: [Ar]

K electron configuration: [Ar] 4s1

We notice that Ca has two electrons in the 4s sublevel, which satisfies what the question is asking for.

The answer is thus B. Ca.

Answer:

:)

Explanation:

Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.

The empirical formula of the compound is \(CdC_{4} H_{6} O_{4}\).

To determine the empirical formula of a compound, we need to find the simplest whole-number ratio of atoms present in the compound. We can calculate this ratio using the given masses of the elements.

Given:

Mass of Cd = 112 g

Mass of C = 48 g

Mass of H = 6.048 g

Mass of O = 64 g

Step 1: Convert the masses of each element into moles using their respective molar masses.

Molar mass of Cd = 112 g/mol

Molar mass of C = 12 g/mol

Molar mass of H = 1 g/mol

Molar mass of O = 16 g/mol

Number of moles of Cd = 112 g / 112 g/mol = 1 mol

Number of moles of C = 48 g / 12 g/mol = 4 mol

Number of moles of H = 6.048 g / 1 g/mol = 6.048 mol

Number of moles of O = 64 g / 16 g/mol = 4 mol

Step 2: Find the simplest whole-number ratio of the moles of each element by dividing each mole value by the smallest mole value.

Ratio of Cd : C : H : O = 1 mol : 4 mol : 6.048 mol : 4 mol

Dividing by 1 mol gives:

Ratio of Cd : C : H : O = 1 mol : 4 mol : 6.048 mol : 4 mol

Approximating to the nearest whole numbers, we get:

Ratio of Cd : C : H : O = 1 : 4 : 6 : 4

Step 3: Write the empirical formula using the simplified ratio.

The empirical formula of the compound is  \(CdC_{4} H_{6} O_{4}\).

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By balancing the equation the ratio between CO₂ and H₂O is 4:6. By calculating we get the number of molecules of Carbon dioxide produced is 5.63 ×10²³.

The reaction here is the Ethane and oxygen reacts to form Carbon dioxide and water. The reaction is

 C₂H₆ + O₂   -----------> CO₂ + H₂O

We can balance the reaction

2C₂H₆ + 7O₂  ----------> 4CO₂ + 6H₂O

2 moles of ethane reacts with 7 moles of oxygen to get 4 moles of carbon dioxide and 6 moles of water.

Here 8.45× 10²³ molecules of water is produced

To find the number of moles, use the equation,

Number of moles = Number of molecules / Avogadro's number

                             = 8.45× 10²³/ 6.022× 10²³

                             = 1.403 moles

Ratio between CO₂ and H₂O is 4:6. Using proportions the moles of CO₂ is  \(\frac{4}{6} = \frac{x}{1.403}\)

x = 1.403 × 4/6 = 0.935 moles

Number of molecules in 0.935 moles of Carbon dioxide  = 0.935 × 6.022×10²³ = 5.63 ×10²³

So, the answer is 5.63×10²³

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Complete question is given as the image.

Energy required : 4.23 x 10⁹ J

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

\(\tt V=L\times W\times H\\\\V=10\times 4\times 3=120~m^3\)

ρ = 1000 kg/m³

\(\tt mass=\rho\times V\\\\mass=1000~kg/m^3\times 120~m^3=120,000~kg\)

c water = 4200 J/ kg ° C  

\(\tt Q=m.c.\Delta T\\\\Q=1.2\times 10^5\times 4200\times (28.6-20.2)\\\\Q=42336\times 10^5=4.23\times 10^9~J\)

Horus, the god of the sky, was one of the most significant deities in ancient Egypt. The pharaoh was believed to be the personification of Horus on earth.

Horus was one of the most ancient and vital deities in the Egyptian religion. He was known as the god of the sky and, later on, the god of war and hunting. Horus was often depicted as a falcon or a human figure with a falcon's head. In ancient Egyptian society, the pharaoh was considered the most powerful and divine person. The pharaoh was believed to be the living Horus and the son of Osiris and Isis.

The Egyptian king was considered Horus on earth, and he was tasked with maintaining order and stability throughout the kingdom. Horus was considered the patron god of the pharaohs, and many of them were named after him. The Egyptians believed that the pharaoh was responsible for maintaining Ma'at, the divine order of the universe. The king was believed to be the mediator between the gods and the people and was responsible for ensuring that the gods were pleased with their offerings.

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Answer:

wat dose dis du

Explanation:

u to frend lit me now if yu need help with yur math and english homewirk. me got anser 2 evryting

Answer:

The electromagnet and wire have to be in contact to apply the force.

Explanation:

To calculate the percentage of limestone dissolved in each solution, subtract the final mass from the initial mass, divide by the initial mass, and multiply by 100.

To determine the percentage of limestone dissolved in each solution, we follow a simple formula using the initial and final mass of the limestone.

First, subtract the final mass from the initial mass to find the mass that dissolved. Then, divide this value by the initial mass to get the fraction of limestone dissolved. To express this fraction as a percentage, multiply it by 100.

The formula can be summarized as follows:

Percentage of limestone dissolved = [(Initial mass - Final mass) / Initial mass] * 100

By using this formula for each acid concentration, you can calculate the percentage of limestone dissolved in each solution. This analysis allows you to quantify the effectiveness of the acid concentration in dissolving the limestone.

Remember to consult the math review or resources on percentages if you need further assistance with the calculations.

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Answer:

The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch

Explanation:

Answer:

decrease

Explanation:

In double replacement reactions, the two metals will not combine with each other when products are formed because the atoms of metals contain less than half the full complement of electrons in their outermost shell.

This is referred to as a type of reaction in which the positive and negative ions of two compounds exchange places to form two new products or substances.

The two metals will not combine with each other when products are formed because of their atoms having less than the required electrons which is needed to complement those in the outermost shell.

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The mass of KClO₃ that was decomposed in the given reaction by the ideal gas equation is approximately 7.19 grams.

Given:

Pressure (P) = 0.964 atm

Volume (V) = 0.65 L

Temperature (T) = 22 °C = 22 + 273.15 = 295.15 K

The ideal gas law: PV = nRT

Where:

P = Pressure in atm

V = Volume in liters

n = Number of moles

R = Ideal gas constant = 0.0821 L·atm/(mol·K)

T = Temperature in Kelvin

n = (PV) / (RT)

n = (0.964 atm) × (0.65 L) / (0.0821 L·atm/(mol·K) × 295.15 K)

n ≈ 0.0294 mol

2 moles of KClO₃ produce 1 mole of O₂. Therefore, the number of moles of KClO₃decomposed would be:

Moles of KClO₃= 2 × 0.0294 mol

Moles of KClO₃≈ 0.0588 mol

Molar mass of KClO₃= 122.55 g/mol

Mass of KClO₃= Moles of KClO₃× Molar mass of KClO₃

Mass of KClO₃≈ 0.0588 mol × 122.55 g/mol

Mass of KClO₃≈ 7.19 grams

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Answer:

The answer is 2.

Explanation: