A person who has a mass of 60kg run up a flight of stairs 12m high in 20 seconds What is the weight of the person​

Answer: Acceleration can be defined as the rate at which velocity changes

Acceleration has the units m/s2.

Hope this helps! :D

Hello There!

"ACCELERATION" can be defined as the rate at which velocity changes

Answer:

D

Explanation:

The reactants are butane gas and oxygen, and the product is carbon dioxide and water VAPOR. The letter beside the water formula means it's a gas.

Final answer:

The correct word equation is that butane gas reacts with oxygen gas to form carbon dioxide gas and water vapor. This is a combustion reaction where the hydrocarbon butane combusts in the presence of oxygen to produce these products.

Explanation:

The correct word equation for the reaction 2C₄H₁₀ (g) + 13O₂ (g) ⇒ 8CO₂ (g) + 10H₂O (g) is D) Butane gas reacts with oxygen gas to form carbon dioxide gas and water vapor.

In this reaction, butane (C₄H₁₀) and oxygen (O₂) are the reactants, while carbon dioxide (CO₂) and water (H₂O) are the products. Since the reaction includes the conversion of gases and no liquids are mentioned in the context of products, we can conclude that the water produced is also in gaseous form which is commonly referred to as water vapor.

A complete combustion reaction always yields carbon dioxide and water as products, assuming ample oxygen is available. If the reaction had incomplete combustion, carbon monoxide (CO) could be present, but this is not indicated in the given equation.

Answer: For Number #1)

The solution above is an acidic solution  

Kw= {H+}*{OH^-}

[OH^-] =Kw/[H+]

OH^-= 1.0*10^14/ 1.0*10^-4  

=1.0*10^4

Answer:

1) [OH-] = 1*10⁻¹⁰ mol/L

Solution is Acidic

2) V = 14.4 L

3) q = -26125 J

4) Concentration of NaCl = 2.59 M

Explanation:

1) Given:

[H+] = 1*10⁻⁴ mol/L

Formula:

[tex][H+][OH-] = 10^{-14} \\[/tex]

[tex][OH-] = \frac{10^{-14} }{10^{-4} } \\\\[OH-] = 1*10^{-10} mol/L[/tex]

[tex]p[H] = -log[H+] = -log[10^{-4} ] = 4[/tex]

Since pH < 7, the solution is acidic

2) Given:

Initial conditions:

Pressure, P1 = 1 atm

Temperature, T1 = 273 K

Volume, V1 = 10.0 L

Final conditions:

Pressure, P2 = 2.0 atm

Temperature, T2 = 512+273 = 785 K

Volume, V2 = ?

Formula:

[tex]\frac{P1V1}{T1} = \frac{P2V2}{T2} \\\\V2 = \frac{P1V1}{T1} * \frac{T2}{P2} \\\\V2 = \frac{1*10.0}{273} * \frac{785}{2} = 14.4 L[/tex]

3) Given:

Volume of tea = 250 ml

Initial temp T1 = 375 K

Final temp, T2 = 350 K

Formula:

Energy transferred, q = mcΔT = mc(T2-T1)

m = mass of tea (water) = density * volume = 1 g/ml * 250 ml = 250 g

c = specific heat of tea (water) = 4.18 J/ gK

ΔT = T2-T1 = 350-375 = -25 K

q = 250*4.18*(-25) = -26125 J

4) Given:

Volume of sea water = 0.500 L

Mass of NaCl = 75 g

Molar mass of NaCl = 58 g/mol

Formula:

[tex]Molarity = \frac{Moles \ NaCl}{Volume\ of\ solution} \\\\Moles\ NaCl = \frac{mass}{molar\ mass} = \frac{75}{58} =1.293\\\\Molarity = \frac{1.293}{0.500} =2.59 M[/tex]

The names of the organic compounds are.

CH- (methyl radical)

CH2 (methylene)

Organic compounds are molecules that contain carbon atoms bonded to other atoms, typically hydrogen, oxygen, nitrogen, sulfur, or halogens. These compounds form the basis of life on Earth and are essential to many biological processes. They are also widely used in industry and technology, including in the production of plastics, fuels, medicines, and many other materials.

Organic compounds can be categorized into different functional groups based on the type of atom or group of atoms bonded to the carbon backbone. These functional groups determine the chemical and physical properties of the compound, such as its reactivity, solubility, and melting point. Some common functional groups include alkanes, alkenes, alkynes, alcohols, ethers, amines, carboxylic acids, esters, and amides.

The names of the organic compounds are.

CH- (methyl radical)

CH2 (methylene)

CH (methylidyne)

CH (methylidyne)

HC- (carbene)

-CH- (methylene bridge)

CH (methylidyne)

CH (methylidyne)

CH (methylidyne)

CH (methylidyne)

CH, JCH-CH2-CH-SCH (mixture of methylidyne and other functional groups)

CH3CH-CH (1-butene)

3-ethyl-4-methylheptane

2,3,5-trimethylheptane

2-methylpropane

H€¢¢¢-H (a molecule of hydrogen gas)

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The examples provided contain different types of organic compounds. The first compound is named as 3-ethyl-2,2-dimethylheptane. The second compound is named as propene, and the third compound is named as 2-pentene. These names follow the IUPAC nomenclature rules for alkanes and alkenes.

The longest chain has seven C atoms, so we name this molecule as a heptane. We find two one-carbon substituents on the second C atom and a two-carbon substituent on the third C atom. So this molecule is named 3-ethyl-2,2-dimethylheptane.

Here are some basic rules for naming alkenes from the International Union of Pure and Applied Chemistry (IUPAC):

Final answer:

The speed of light waves can decrease when they pass from a faster medium to a slower medium, which happens when moving from a solid to a gas, a liquid to a gas, a gas to a liquid, or a solid to a liquid.

Explanation:

The speed of light waves can change when they pass from one medium to another. Generally, the speed of light waves decreases when they move from a faster medium to a slower medium. Based on this, the changes in the medium that will likely cause the speed of light waves to decrease are:

Answer:

Explanation:

A hydrated compound is one that contains water molecules chemically bonded. So,  the correct question is how many waters are bonded to sodium suilfate?

The latin prefix deca means ten (10), and the word hydrate means that contains water; then, decahydrate is used in chemistry to designate a compound that is bonded to 10 parts (molecules) of water.

Hence, sodium sulfate decahydrate means that each molecule of the compound is bonded to 10 molecules of water.

In the chemical formula, the water molecules of a hydrated compound are shown after the chemical formula of the compound using a period and a coefficient (the number of water molecules bonded) before the water molecules.

Then, given that the chemical formula for sodium sulfate is Na₂SO₄, the chemical formula for sodium sulfate decahydrate is Na₂SO₄·10H₂O.

It is the first one that's correct...

Science is characterized by asking questions about the natural world. It involves a methodical process of observation, hypothesizing, experimentation and conclusion. Science does not use opinions to make conclusions but relies on systematic observation, experimentation and testing to ascertain facts.

A characteristic of science is that it asks questions about the natural world. This process is often initiated by observation, leading scientists to generate questions they wish to answer. Science employs systematic methods for observing the universe, forming theories and testing hypotheses to understand how the world operates.

In essence, science seeks to discover and describe the underlying order within nature. It's through the rigorous processes of observation, hypothesis formulation, experimentation, and conclusion that science separates facts from opinion, aiming to describe the universe accurately as it is and not as imagined or wished.

This investigative approach isn't conducted by single individuals; it's a collaborative endeavor involving many scientists. Most importantly, science does not use opinions to draw conclusions. Rather, it bases conclusions on evidence and facts gathered systematically through experiments, observations, and testing.

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This is filler, the answer is in the image.

Answer: I think it is HPDE.

Answer:

50CuS2 + 260HNO3 = 50Cu(NO3)2 + 100H2SO4 + 80N2O + 3H2O

Explanation:

Answer:

It is the Avogadro's Law that should be used  to determine the relationship between the volume and the number of moles in the equation. This law relates the volume and the the amount in moles of a gas.

that should be used  to determine the relationship between the volume and the number of moles in the equation. This law relates the volume and the the amount in moles of a gas.

Answer:

Volume = lwh

Explanation:

Answer:

Empirical Observation, Replicable Experiments, Provisional Results, Objective Approach, and Systematic Observation.

Answer:

Reliable science refers to the approximate result that is obtained after conducting various methods for the same experiment. All scientific results are based on the evidences that are obtained by conducting experiments. This derived value confirms the accuracy of the result. The more similar the result obtained by approaching various scientific methods in a particular experiment, the more is the reliability. A reliable scientific experiment shows a minimum error.

Reliable science includes an experiment with proper observation, careful reading, gathering the proper information and modeling with a justifying conclusion.

The energy change of the system was calculated using the formula q = mcΔT. After finding the energy change per gram of water, it was converted to energy change per mole of solute giving the heat of the solution, ΔH = -8.0 kJ/mol.

The energy change in a system is given by the formula: q = mcΔT, where m is the mass of the system, c is the specific heat capacity and ΔT is the change in temperature.

We are given that the temperature decreases so the reaction is endothermic (heat is absorbed) and we use a positive q. The mass of the water is 100g, c for water is 4.18 J/g°C, and ΔT = Final temp - Initial temp = 21.56°C - 25.00°C = -3.44°C.

So, q for water = (100g)*(4.18 J/g°C)*(-3.44°C) = -1438.72 J. We want the answer per mol NaNO3 so we get the molar mass of NaNO3= 85 g/mol. So 15.3 g is 15.3 g ÷ 85 g/mol = 0.18 mol NaNO3.

Finally, q for the solution = q for water ÷ moles of solute = -1438.72 J ÷ 0.18 mol = -7993.7 J/mol. This is the heat of solution in J the question asks for the answer in kJ so we convert, ΔH = -8.0 kJ/mol.

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To calculate Delta H for a solution in a calorimeter, utilize the formula for specific heat capacity, and then calculate the change in enthalpy on basis of moles of solute and heat energy extracted. This example uses nano3 as the solute in a water solution and measures the corresponding decrease in temperature.

The process of calculating Delta H involves using the formula for specific heat capacity Q = mcΔt, which is heat energy equals mass times specific heat capacity times change in temperature. The change in enthalpy, or Delta H, is then -Q divided by the number of moles of the solute, which in this case is nano3. With the given values, we can use the specific heat capacity of water (4.184 J/g°C), the mass of water (100g), and the change in temperature (25.00°C to 21.56°C). Performing necessary calculations, we finally find the value of Delta H for this solution process.

Specific heat capacity, change in enthalpy (Delta H), and moles of solute are the principal factors in determining the behavior of this solution in the calorimeter.

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Every half-life, we end up with half of the material we started with. At the beginning, we have all of the material, which we can represent with the number 1. After one half-life, we have 1 • 1/2 = 1/2 left.

After two: 1/2 • 1/2 = 1/4

Three: 1/4 • 1/2 = 1/8

Four: 1/8 • 1/2 = 1/16

And five: 1/16 • 1/2 = 1/32.

In general, after n half-lives, we’ll have 1/(2^n) of the material left over.

Answer:

The correct answer is :1 by 32 of the original sample

Explanation:

Formula used :

[tex]A=\frac{A_o}{2^n}[/tex]

where,

A = amount of reactant left after n-half lives = ?

[tex]A_o[/tex] = Initial amount of the reactant = 100 g

n = number of half lives

If five half-lives have occurred.

[tex]A=\frac{A_o}{2^5}[/tex]

[tex]A=\frac{A_o}{32}[/tex]

Hence, the correct answer is :1 by 32 of the original sample

Answer:

A reaction is spontaneous if ΔG is negative.

Explanation:

If ΔG is negative, the reaction is spontaneous.

If ΔG = zero, the reaction is at equilibrium.

If ΔG is positive, the reaction is non-spontaneous.

Answer:

A) Homogeneous

Explanation:

Hope this helped :)

Answer:

Cao,NaNo3,Nacl sucrose and cuo

Explanation:

Hygroscopic substances attract water from their surroundings with examples including saltwater, soap, and toothpaste, while deliquescent substances, such as KOH and CaCl₂, can absorb enough water to dissolve. Hygroscopic materials contain bound water, which is tough to remove and can cause shrinkage upon removal.

Hygroscopic substances are those that readily attract and absorb water from their surroundings. Examples include saltwater, soap, toothpaste, bleach, cleaning agents, limewater, and ammonia water. Deliquescent substances are a subset of hygroscopic materials but are so good at absorbing water that they can dissolve in the absorbed water and form a solution. Substances like potassium hydroxide (KOH) and calcium chloride (CaCl₂) are examples of deliquescent materials.

A hygroscopic material consists of all three phases: gas, liquid water, and solid, and it contains bound water, which is strongly bonded to the material and difficult to remove. In contrast to this bound water, free water can be removed through methods such as capillary diffusion and convection flow. When bound water is removed by drying or frying, hygroscopic materials often shrink.

Solution is here,

for initial case,

temperature(T1)=70°C=70+ 273=343K

vloume( V1) =45 L

for final case,

temperature( T2)=?

volume(V2)= 91.3 L

at constant pressure,

V1/V2 = T1/T2

or, 45/91.3 = 343/ T2

or, T2= (343×91.3)/45

or, T2=695.9 K = (695.9-273)°C=422.9°C

The temperature needed for a sample of gas to occupy 91.3 L, when originally it occupied 45.0 L at 70.0°C at constant pressure, is about 423.71°C.

This question pertains to the ideal gas law equation (P1V1/T1 = P2V2/T2, where P is pressure, V is volume, and T is temperature), we must first convert our temperatures to Kelvin (K) since the ideal gas law uses absolute temperature. To convert from degrees Celsius to K, add 273.15, thus 70.0°C becomes 343.15K. As the problem states pressure is constant, we can ignore that component of the equation and it simplifies to V1/T1 = V2/T2.

By rearranging the equation to solve for V2, we get V2 = V1 (T2/T1). Given the volume of the gas at the initial temperature (V1 = 45.0 L), and temperature T2 with unknown value, we rewrite the equation as T2 = (V2 * T1) / V1. Substituting the given values into the equation gives T2 = (91.3 L * 343.15K) / 45.0 L, which calculates to approximately 696.86K, converting back to Celsius gives us around 423.71°C.

So, your sample of gas would need to be heated to approximately 423.71°C in order for it to occupy a volume of 91.3 L at constant pressure.

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A pH is an easy way to describe the acidity of a solution (determined by the [H+] concentration) - it’s easier to say that a cup of coffee has a pH of 5 rather than saying that the “hydrogen ion concentration is 10^-5 molar”.

The way pHs work is through logarithms, which convert a set of values into a new one using a base value. For example, pHs use a base 10 to simplify the numbers, while earthquake energy scales use a base of 32. An increase of 1 on the logarithmic scale is an “n” times increase in the scale, where “n” is the base of the logarithm. So, for example, in the case of pH, three solutions with a pH of 5, 6, and 7 can be related; the pH scale uses base ten, so the pH 6 solution is 10x more acidic than the pH 7, and the pH 5 is 100x (10x10) more acidic than the pH 7. For earthquakes, a magnitude 5 earthquake is 32x weaker than a magnitude 6 and 1,024x (32x32) weaker than a magnitude 7.

The pH formula looks like this:

pH = -log [H+]

The negative sign basically serves to make the low end acidic; without the negative, a pH of 14 would be extremely acidic instead of basic. It’s one of those things that you’ll just have to remember.

So, for your solution, just enter the concentration into the formula:

pH=-log[1.0 x 10^-4] = 4

The pH of this solution would be 4.

Hope this helps!

C, because specific heat is measured in Joules/grams°C

Answer: B) 1 Calorie

Explanation: The heat required to raise the temperature of 1 gram of a substance by 1 degree C is known as its specific heat capacity.

Specific heat capacity of water is [tex]\frac{4.184Joule}{g*0_C}[/tex] and we know that, 4.184 Joule = 1 Calorie

So, specific heat capacity of water is [tex]\frac{1Calorie}{g*0_C}[/tex] and hence the correct choice is B.

Answer:

C: It is conserved

Explanation:

The reaction neither lost (exothermic) or gained (endothermic) energy, therefore the total energy remained the same and was conserved.

Answer:

D: It is converted

Explanation:

according to the law of conservation of energy:

In physics and chemistry, the law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time.

Meaning that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another without any loss of energy

Answer:

The right choice is  V₂ = 195.7 L

Explanation:

where, P is the pressure of the gas in atm.

V: is the volume of the gas in L.

n: is the no. of moles of the gas in mol.

R:  is the general gas constant,

T: is the temperature of the gas in K.

If n is constant, and have different values of P, V and T:

(P₁*V₁) / T₁ = (P₂ * V₂) / T₂

Knowing that:  

V₁  =  225 L  ,         P₁ = 0.940 atm

T₁ = 25  °C + 273  =  298 K

V₂  =  ??? L,           P₂ = 0.990 atm  

T₂ = 0 °C + 273  =  273 K

applying in the above equation

(P ₁* V₁) / T₁ = (P₂ * V₂) / T₂

(0.940 atm * 225 L) / 298 K= (0.990 atm  * V₂) / 273 K

V₂ = (0.940 atm * 225 L * 273 K) / (298 K * 0.990 atm)

V₂ = 195.7 L

So, the right choice is:

V₂ = 195.7 L

By applying the combined gas law, the new volume of the air-filled balloon, considering changes in pressure and temperature, is approximately 188.2 L.

Given:

V1 = 225 L

P1 = 0.940 atm

T1 = 25 °C

P2 = 0.990 atm

T2 = 0 °C

To find: V2

We can use the combined gas law to solve this problem:

P1V1 / T1 = P2V2 / T2, where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.

Rearranging the equation to solve for V2, we get:

V2 = V1 × (P1 / P2) × (T2 / T1)

Plugging in the given values, we get:

V2 = 225 L × (0.940 atm / 0.990 atm) × (273 K / 298 K)

V2 = 188.2 L

So, the new volume of the balloon is indeed 188.2 liters.

Bromine --> Br: Period 4, Group 17 [Halogen]

Answer:

The limiting reactant is AlCl₃ and the excess reactant is NaOH.

Explanation:

3NaOH(aq) + AlCl₃(aq) → 3NaCl(aq) + Al(OH)₃(s)↓,

It is clear that 3.0 moles of NaOH(aq) react with 1.0 mole of AlCl₃(aq) to produce 3.0 moles of NaCl(aq) and 1.0 mole of Al(OH)₃(s).

no. of moles of NaOH = mass/molar mass = (8.0 g)/(40.0 g/mol) = 0.2 mol.

no. of moles of AlCl₃ = mass/molar mass = (4.0 g)/(133.34 g/mol) = 0.03 mol.

∴ 0.09 mol of NaOH (the remaining 1.1 mol is in excess) reacts completely with 0.03 mol of AlCl₃.

the limiting reactant is AlCl₃ and the excess reactant is NaOH.

Answer:

b. Drainage basin

Explanation:

Earth's atmosphere is unique due to the presence of life that has influenced its composition, unlike the atmospheres of Venus and Mars, which do not support life and have atmospheres dominated by carbon dioxide and lacking in water vapor.So,option B is correct.

The composition of Earth's atmosphere is different from the atmospheres of Venus and Mars primarily because Earth has life, and Venus and Mars do not. This is option B. All three planets started with similar chemicals, but their evolutionary paths diverged because of factors such as their distance from the sun and geological activities. Earth's atmosphere, rich in oxygen and water vapor, not only supports life but has been shaped by it through processes like photosynthesis. In contrast, Venus has a thick atmosphere dominated by carbon dioxide with extreme surface pressure and temperature, making it hot and dry. Mars has a thin atmosphere, also mostly carbon dioxide, and is cold and dry, but it has signs that it once had conditions suitable for life.

The presence or absence of life significantly influences the atmospheric composition. Life on Earth has contributed to the oxygen levels and the presence of water vapor. The lack of life on Venus and Mars means that these planets have been unable to develop the same balance of gases that supports life here on Earth. Consequently, each planet's atmosphere is a result of its unique environmental conditions and history.

From the information provided in question, the metal is copper.

The specific heat capacity of a substance is an intrinsic property. It can be used to identify a substance. Intrinsic properties are characteristic of substances. From the information provided, we can obtain the specific heat capacity of the metal.

Using;

H = mcdT

Where;

H = Heat absorbed

m = mass of the metal

c = specific heat capacity of the metal

dT = temperature change

20 J = 0.0052 Kg × c × ( 40.0°C - 30.0°C)

c = 20 J/0.0052 Kg × ( 40.0°C - 30.0°C)

c = 385 JKg-1°C-1

The metal is copper.

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Final answer:

When water boils, the water’s internal kinetic energy increases, and upon reaching the boiling point, the energy input turns into potential energy to convert water to steam. Air bubbles seen are not from the atmosphere but from dissolved gases, and the water's temperature does not increase beyond the boiling point.

Explanation:

When water is boiling in a pot, several physical changes occur. The water’s internal kinetic energy is increasing due to the heat supplied, which causes the water molecules to move faster. As the temperature of the water reaches the boiling point, the added energy goes into breaking the intermolecular forces, converting liquid water into water vapor, which is observed as boiling. This process is known as the phase transition from liquid to gas.

Air bubbles from the atmosphere are not being absorbed; instead, existing dissolved gases in the water can form bubbles. The water's temperature does not continue to increase once it reaches the boiling point, which for pure water at sea level is 100°C. At this point, any extra energy supplied by the stove is used to turn the water into steam, which is a process that involves gaining internal potential energy, rather than increasing temperature. Lastly, individual water molecules are indeed escaping from the pot, forming steam as they enter the gas phase.

Answer:

Ag(s) or Solid Silver. Silver in a solid phase has a face centered cubic crystal structure. Among your choices, silver is the only example of particles that are arranged in their crystal structure while the other choices are gases and liquid. Liquid and gases have loose atoms that do not form crystal structures.

Explanation:

Answer:

11.66 L.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(V₁n₂) = (V₂n₁).

V₁ = 25.5 L, n₁ = 3.5 mol.

V₂ = ??? L, n₂ = 3.5 mol - 1.9 mol = 1.6 mol.

∴ V₂ = (V₁n₂)/(n₁) = (25.5 L)(1.6 mol)/(3.5 mol) = 11.66 L.

Hello!

A 25.5 liter balloon holding 3.5 moles of carbon dioxide leaks. If we are able to determine that 1.9 moles of carbon dioxide escaped before the container could be sealed, what is the new volume of the container?​

V1 (initial volume) = 25.5 L

n1 (initial number of moles) = 3.5 mol

V2 (final volume) = ? (in L )

Note: there was a leak in the number of moles, so we have:

n2 (final number of moles) = 3.5 mol - 1.9 mol = 1.6 mol

By Avogadro's Law it is known that the volume is directly proportional to the number of gas particles, that is, the larger the number of moles of gas, the greater its volume, on which we have the following relation:

[tex]\boxed{\dfrac{V_1}{n_1} = \dfrac{V_2}{n_2}}[/tex]

We apply the data to the formula, we have:

[tex]\dfrac{V_1}{n_1} = \dfrac{V_2}{n_2}[/tex]

[tex]\dfrac{25.5}{3.5} = \dfrac{V_2}{1.6}[/tex]

multiply the means by the extremes

[tex]3.5*V_2 = 25.5*1.6[/tex]

[tex]3.5\:V_2 = 40.8[/tex]

[tex]V_2 = \dfrac{40.8}{3.5}[/tex]

[tex]V_2 = 11.657... \to \boxed{\boxed{V_2 \approx 11.66\:L}}\:\:\:\:\:\:\bf\green{\checkmark}[/tex]

Answer:

The new volume of the container is approximately 11.66 liters

________________________

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Answer:

your answer is B:  Hydrogen sulphide

Explanation: