If an object is moving right at 10 N and a force is applied from the left at 8N, what is the net force on the object?

Answer:

Because in methane atoms of carbon and hydrogen are present in simplest ratio of 1:4 that can not be simplified further in whole number so its Emperical formula is same as molecular formula.

Explanation:

The molar concentration of the HCl solution is 1.2 M.

The balanced chemical equation for the reaction between HCl and NaOH is:

HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)

From the equation, we can see that one mole of HCl reacts with one mole of NaOH.

Given that 15.0 mL of 0.40 M NaOH is required to neutralize 5.0 mL of HCl, we can use the following equation to calculate the concentration of HCl:

moles of NaOH = concentration of NaOH x volume of NaOH (in liters)

moles of HCl = moles of NaOH (since they react in a 1:1 ratio)

concentration of HCl = moles of HCl / volume of HCl (in liters)

Converting the volumes to liters:

Volume of NaOH = 15.0 mL = 0.015 L

Volume of HCl = 5.0 mL = 0.005 L

Substituting the values:

moles of NaOH = 0.40 M x 0.015 L = 0.006 moles

moles of HCl = 0.006 moles (since they react in a 1:1 ratio)

concentration of HCl = 0.006 moles / 0.005 L = 1.2 M

As a result, the HCl solution has a molar concentration of 1.2 M.

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Answer: Sublimation absorbs energy.

Explanation:

\(element \: with \: 2 \: atomic \: number \\ \\ is \: stable \: because \: it \: has \: already \: \\ \\ completed \: its \: orbit \: \\ \\ but \: atomic \: number \: with \: 3 \: and \: 9 \\ \\ will \: have \: to \: become \: stable \: \\ \\ after \: giving \: one \: electron \\ \\ so \: \: element \: with \: 3 \: and \: 9 \: atomic \: number \\ \\ is \: most \: reactive\)

A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that  the train is moving with uniform velocity with no acceleration because there is no change in velocity.

This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.

If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.

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The combustion reaction of propanol, represented as 2C₄H₁₀(1) + 13O₂(g) → 8CO₂(g) + 10H₂O(1), involves the transfer of heat from the surroundings to the system. This exothermic process releases energy, as indicated by the negative enthalpy value of -442 kJ.

The combustion of propanol results in the formation of carbon dioxide (CO₂) and water (H₂O), while consuming oxygen (O₂) in the process.

This reaction is commonly used to provide heat in various applications, such as heating systems and fuel combustion.

By understanding the thermodynamics of this reaction, it becomes evident that it releases a substantial amount of energy in the form of heat, making it a valuable source of warmth and power.

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Answer:

25.56 degrees Celsius

Explanation:

Answer:

2 mol/L

Explanation:

Molarity is Moles/Liters, you just simple divide 5 moles ÷ 2.5 L =2 mol/L

Answer:

429 calories

Explanation:

Using the specific heat equation, Q=mcΔt and solving for Q will give the number of calories.

Q=(250 g)(0.033 cal/g*C)(52C)= 429 cal

Answer:

Mechanical energy is energy that results from movement or the location of an object. Mechanical energy is the sum of kinetic energy and potential energy.

Explanation:

Nuclear energy is energy resulting from changes in the atomic nuclei or from nuclear reactions.

Example: Nuclear fission, nuclear fusion, and nuclear decay are examples of nuclear energy. An atomic detonation or power from a nuclear plant are specific examples of this type of energy.

Answer:

D) The rate of the forward reaction would decrease

Explanation:

The statement that describes effect on the reaction of increasing the temperature is "the rate of the forward reaction would decrease."

Temperature is the measurement of a body's level of hotness or coolness.

The average kinetic energy of the system is measured by temperature. The kinetic energy of particles in a matter raises as they move faster, which boosts the temperature of the system. When two bodies of differing temperatures come into touch, heat is the energy exchanged between them.

The term "exothermic reaction" refers to a reaction that releases energy. An exothermic reaction, in other words, produces heat. The temperature of the reaction will rise unless it is cooled in some way. When you use an external heater to raise the temperature, it slows or reverses the reaction, reducing the number of products while increasing the amount of reactants.

Hence the correct answer is D.

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Fire is a risk in all commercial kitchens. Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires.

What is an accidental fire?

Accidental fires are those in which the proven cause does not involve any deliberate human act to ignite or spread the fire.

Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires. Employers must implement effective administrative controls to protect employees and the business from the dangers of fire.

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Answer:

False

Explanation:

The increase of methane and Carbon dioxide helps trapping the heat inside Earth's atmosphere, temperature increases and this leads to global warming

(a) By using the formula \(K = 0.5 * m * v2\) to determine an object's kinetic energy, we can determine the electron's speed in the hydrogen atom's lowest energy state. This results in an effective current of \(3.52 x 10-13 A\) for this orbiting electron.

An electron's rate of motion through space is referred to as its speed. It is used to determine how fast something is moving and is normally stated in metres per second (m/s). A multitude of variables, including an electron's energy, mass, and exposure to electric and magnetic fields, can have a significant impact on how fast an electron moves. Electrons can move at rates that range from less than a metre per second to almost the speed of light in the setting of atomic and molecular physics. When free electrons are present in a substance, such as a metal, they can occasionally flow through it at extremely fast speeds, which increases the material's electrical conductivity.

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Answer: The volume of 9.7 tons of given ethylene glycol is 0.0079 \(m^{3}\).

Explanation:

Given: Density = 1.11 \(g/cm^{3}\)

Mass = 9.7 tons

Convert tons into lb as follows.

\(1 ton = 2 \times 10^{3} lb\\9.7 ton = 9.7 ton \times 2 \times 10^{3} \frac{lb}{1 ton}\\= 19.4 \times 10^{3} lb\)

Now, lb is converted into kg as follows.

\(1 kg = 2.2046 lb\\1 lb = 0.453592 kg\\19.4 \times 10^{3} lb = 19.4 \times 10^{3} lb \times 0.453592 \frac{kg}{1 lb}\\= 8.79 kg\)

1 kg = 1000 g

So, 8.79 kg = 8790 g

Density is the mass of a substance divided by its volume. Hence, volume of ethylene glycol is calculated as follows.

\(Density = \frac{mass}{volume}\\1.11 g/cm^{3} = \frac{8790 g}{volume}\\volume = 7918.92 cm^{3} (1 cm^{3} = 10^{-6} m^{3})\\= 0.0079 m^{3}\)

Thus, we can conclude that the volume of 9.7 tons of given ethylene glycol is 0.0079 \(m^{3}\).

Rubbing alcohol evaporates quickly at room temperature" is a physical property.  "A slice of apple will turn brown if left out in the air" is a chemical property.  "Sodium metal (Na) reacts violently with water" is a chemical property.  "Chlorine gas (Cl2) is a yellowish-green color" is a physical property.  "The chemical compound nitrogen triiodide (NI3) explodes with just the slightest touch" is a chemical property.  "Mercury (Hg) is a liquid at room temperature" is a physical property.

physical: Evaporation is a physical property because it is a change in the state of a substance (from liquid to gas) that does not involve a chemical reaction.

chemical: The browning of an apple slice is a chemical change because it involves a chemical reaction that produces new substances.

chemical: The reaction of sodium metal with water is a chemical change because it involves a chemical reaction that produces new substances.

physical: Color is a physical property because it is a characteristic that can be observed without changing the substance's chemical composition.

chemical: Nitrogen triiodide exploding is a chemical change because it involves a chemical reaction that produces new substances.

physical: Mercury is a liquid at room temperature because of its atomic structure and the physical state of matter is determined by the strength of the intermolecular forces between atoms.

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The student is correct because organisms are more likely to be preserved in sedimentary rock than in igneous rock.

Sedimentary rocks are formed by the accumulation or deposition of mineral or organic particles at the Earth's surface, followed by cementation. Sedimentation refers to the processes that cause these particles to settle in place. Sedimentary rocks form from previously existing rocks or fragments of once-living organisms. They form as a result of deposits accumulating on the Earth's surface. Layering or bedding in sedimentary rocks is common. Sedimentary rocks are formed by sediment accumulation. Sedimentary rocks are classified into three types. Clastic sedimentary rocks form as a result of mechanical weathering debris accumulation and lithification. Breccia, conglomerate, sandstone, siltstone, and shale are some examples.

Here,

Because organisms are more likely to be preserved in sedimentary rock than in igneous rock, the student is correct.

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Answer: 45

Explanation: it would be 45 bc if the value is 5 and over the number goes up and if it is lower than 5 it would stay the same.

Answer:

45 is the answer

Explanation:

Answer:

Tungsten carbide (chemical formula: WC) is a chemical compound (specifically, a carbide) containing equal parts of tungsten and carbon atoms.

Answer:compound

Explanation:

Answer:

Chemical Potential Ener

The volume of 1.00 mole of carbon dioxide is 22.4 L.

According to the Ideal Gas Law, 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.

At STP (standard temperature and pressure), the pressure is 1 atm and the temperature is 273 K. The gas constant R is 0.08206 L atm mol^-1 K^-1.

For 1 mole of any ideal gas at 22.4 L., the volume is 22.4 L. This is known as the molar volume of an ideal gas at STP.

Therefore, the volume of 1.00 mole of carbon dioxide at STP is 22.4 L.

So the correct answer is (b) 22.4 L.

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Considering the definition of atomic number, the number of electrons in this oxygen ion is 18.

All atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).

The atomic number represents the number of protons present in the nucleus of an atom of any element. If the atom is electrically neutral, the number of electrons is equal to the number of protons.

The atomic number of oxygen is 16. If it is a neutral atom, the number of protons and the number of electrons is 16.

Anions are negatively charged ions. They are formed as a consequence of the gain of electrons. Therefore, anions are characterized by having more electrons than protons in their composition.

In this case, an ion of the element oxygen (O) has an overall charge of -2. It means that the neutral atom has gained 2 electrons, so it will have a number of electrons of 18.

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Answer:

–253.5 °C

Explanation:

We'll begin by calculating the number of mole in 6 g of CO₂. This can be obtained as follow:

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO₂ = 6 g

Mole of CO₂ =.?

Mole = mass / molar mass

Mole of CO₂ = 6 / 44

Mole of CO₂ = 0.136 mole

Next, we shall convert 225 mL to L.

1000 mL = 1 L

Therefore,

225 mL = 225 mL × 1 L / 1000

225 mL = 0.225 L

Next, we shall determine the temperature of the gas. This can be obtained as follow:

Pressure (P) = 0.855 atm

Volume (V) = 0.225 L

Number of mole (n) = 0.136 mole

Gas constant (R) = 0.0821 atm.L/Kmol

Temperature (T) =?

PV =nRT

0.855 × 0.255 = 0.136 × 0.0821 × T

0.218025 = 0.0111656 × T

Divide both side by 0.0111656

T = 0.218025 / 0.0111656

T = 19.5 K

Finally, we shall convert 19.5 K to degree celsius (°C). This can be obtained as follow:

T(°C) = T(K) – 273

T(K) = 19.5 K

T(°C) = 19.5 – 273

T(°C) = –253.5 °C

Therefore, the temperature of the gas is –253.5 °C

Answer:

C) The products have more energy stored in their chemical bonds.

Explanation:

In such reactions that absorb energy, the products have more energy stored in their chemical bonds.

For endothermic changes, heat is absorbed from the surrounding hence the surrounding becomes colder at the end of the changes.

The heat energy level of the products is higher than that of the reactants.

Answer:

To identify which half-cell reaction combination produces the cell reaction with the highest positive cell emf, we must compute and compare the cell potentials for each combination.

When the first and second half-reactions are combined, we get:

Cu(s) + Ag+(aq) = Ag(s) + Cu2+(aq)

This reaction's cell potential is:

Ecell is equal to E°(Cu2+/Cu). - E°(Ag+/Ag)

(0.337 V) - (0.799 V) = Ecell

Ecell is equal to -0.462 V.

----------------------------------------------------------

Combining the first and third half-reactions, we get:

Ag+(aq) + Ni(s) → Ag(s) + Ni2+(aq)

The cell potential for this reaction is:

Ecell = E°(Ni2+/Ni) - E°(Ag+/Ag)

Ecell = (-0.28 V) - (0.799 V)

Ecell = -1.079 V

--------------------------------------------------------------

Combining the first and fourth half-reactions, we get:

Ag+(aq) + Cr(s) → Ag(s) + Cr3+(aq)

The cell potential for this reaction is:

Ecell = E°(Cr3+/Cr) - E°(Ag+/Ag)

Ecell = (-0.74 V) - (0.799 V)

Ecell = -1.539 V

-----------------------------------------------------------

Combining the second and third half-reactions, we get:

Cu2+(aq) + Ni(s) → Cu(s) + Ni2+(aq)

The cell potential for this reaction is:

Ecell = E°(Ni2+/Ni) - E°(Cu2+/Cu)

Ecell = (-0.28 V) - (0.337 V)

Ecell = -0.617 V

------------------------------------------------------------------------

Combining the third and fourth half-reactions, we get:

Ni2+(aq) + Cr(s) → Ni(s) + Cr3+(aq)

The cell potential for this reaction is:

Ecell = E°(Cr3+/Cr) - E°(Ni2+/Ni)

Ecell = (-0.74 V) - (-0.28 V)

Ecell = -0.46 V

----------------------------------

As a result, the second and fourth combinations of half-cell reactions result in the cell reaction with the highest positive cell emf: Cu2+(aq) + Ni(s) Cu(s) + Ni2+(aq). This reaction has a cell potential of -0.617 V.

To determine the combination of half-cell reactions that leads to the cell reaction with the largest positive cell emf, we need to look at the reduction potentials of the half-reactions. The half-reaction with the highest reduction potential will be the one that is most likely to occur as reduction is the gain of electrons.

To calculate the overall cell potential, we need to subtract the reduction potential of the anode (where oxidation occurs) from the reduction potential of the cathode (where reduction occurs). The half-reaction with the higher reduction potential will be the cathode, and the other half-reaction will be the anode.

Therefore, we need to look for the combination of half-reactions where the difference between the reduction potentials is the highest.

1st and 2nd: .799 - .337 = .462
1st and 3rd: .799 - (-.28) = 1.079
1st and 4th: .799 - (-.74) = 1.539
2nd and 3rd: .337 - (-.28) = .617
3rd and 4th: (-.28) - (-.74) = .46

The combination with the highest difference in reduction potentials is 1st and 4th, with a difference of 1.539. Therefore, the cell reaction with the largest positive cell emf would be Ag+(aq) + Cr(s) → Ag(s) + Cr3+(aq).

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