Rougher surfaces create more friction, so more force is needed to move something over a rougher surface, true or false

To calculate the experimental mass percent of barium in the sample, we need to use the following formula:
Experimental Mass Percent = (Mass of Barium / Mass of Sample) x 100

Given that the mass of the barium collected was 0.844 g and the mass of the sample was 1.52 g, we can substitute these values into the formula to calculate the experimental mass percent:
Experimental Mass Percent = (0.844 g / 1.52 g) x 100
Simplifying the equation:
Experimental Mass Percent = 0.555 x 100
Calculating the value:
Experimental Mass Percent = 55.5%
So, the experimental mass percent of barium in the sample is 55.5%. The experimental mass percent of barium in the sample is 55.5%. To calculate the experimental mass percent, we divided the mass of barium collected by the mass of the sample and multiplied the result by 100. This gives us the proportion of barium in the sample, expressed as a percentage. To calculate the experimental mass percent of barium in the sample, we used the formula (Mass of Barium / Mass of Sample) x 100. Given that the mass of barium collected was 0.844 g and the mass of the sample was 1.52 g, we substituted these values into the formula to calculate the experimental mass percent. By dividing 0.844 g by 1.52 g, we obtained the proportion of barium in the sample. Multiplying the result by 100, we converted this proportion into a percentage. The final result, 55.5%, represents the experimental mass percent of barium in the sample. This calculation allows us to quantify the amount of barium present in relation to the total sample mass.

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Answer:

Bubbling and fizzing are likely to occur when a new substance is formed. The other examples are simply changing to a different form of the same substance.

Answer:

C. The rate of cellular respiration in the tank was much higher than

the rate of photosynthesis

Explanation:

In nature, cellular respiration and photosynthesis are opposite metabolic reactions. Cellular respiration, which is the process of releasing energy, requires oxygen while photosynthesis, which is the process of manufacturing foods by green plants, releases oxygen into the atmosphere. The two equations are as follows:

Photosynthesis:

6CO2 + 6H2O → C6H1206 + 6O2 (oxygen released)

Respiration:

C6H1206 + 6O2 (oxygen used) → 6CO2 + 6H2O

According to this question, 10 snails and two small aquatic plants were added to a closed glass tank half full with water. It was observed that all the snails died. This is most likely due to the fact that the rate of cellular respiration in the tank was much higher than the rate of photosynthesis.

In other words, the usage of oxygen via cellular respiration was much higher than the release of oxygen via photosynthesis.

Answer:

1. Snails carry out respiration only

2. Aquatic plants carry out both respiration and photosynthesis Although the aquatic plants can absorb carbon dioxide and release oxygen through photosynthesis, the amount of snail is much more than that of the aquatic plants.

During night time,the absence of light prevent the plants from carrying out photosynthesis. No oxygen is released at this time. There is a net release of carbon dioxide in the closed system and hence the snail died of suffocation.

Answer:

Kinetic energy is transferred from the leg to the ball

Explanation:

Before kicking the ball, you'll need to run to where the position of the ball is which implies that your leg is not at rest, immediately you kick the ball, you will be transferring the kinetic energy of your leg to the ball.

Kinetic energy is transferred from the leg to the soccer ball.

Kinetic energy is the strength of the movement, observable as the movement of an item, particle, or set of debris. Any item in movement is the usage of kinetic energy: someone taking walks, a thrown baseball, a crumb falling from a table, and a charged particle in an electric-powered field are all examples of kinetic electricity at work.

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The orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

To find the orbital period (P) of an asteroid with a given semi-major axis (a), we can use Kepler's third law:

a³ = P²

Given that the semi-major axis (a) is 73.4 AU, we can substitute this value into the equation and solve for the orbital period (P):

(73.4 AU)³ = P²

(73.4)³ AU³ = P²

P² = (73.4)³ AU³

Taking the square root of both sides:

P = sqrt((73.4)³) AU

Using a calculator to evaluate the expression, we find:

P ≈ 1652.0 AU

Therefore, the orbital period of the asteroid, carried out to 4 significant digits, is approximately 1652.0 years.

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Answer:

Explanation:

To determine the Ka of the unknown acid, we can use the following steps:

Step 1: Calculate the number of moles of NaOH used.

moles of NaOH = Molarity × Volume of NaOH used

moles of NaOH = 0.0950 mol/L × 0.0300 L

moles of NaOH = 0.00285 mol

Step 2: Calculate the number of moles of acid used.

moles of acid = moles of NaOH (because they react in a 1:1 ratio)

moles of acid = 0.00285 mol

Step 3: Calculate the concentration of the acid.

the concentration of acid = moles of acid/volume of acid used

volume of acid used = volume of water + volume of NaOH used

volume of acid used = 25.0 mL + 30.0 mL = 55.0 mL = 0.0550 L

the concentration of acid = 0.00285 mol / 0.0550 L

concentration of acid = 0.0518 M

Step 4: Calculate the initial moles of acid in the solution.

moles of acid initially = concentration of acid × volume of water used

moles of acid initially = 0.0518 mol/L × 0.0250 L

moles of acid initially = 0.00130 mol

Step 5: Calculate the moles of acid that reacted from the initial amount to the endpoint.

moles of acid reacted = moles of acid initially - moles of acid at the endpoint

moles of acid reacted = 0.00130 mol - 0.00285 mol

moles of acid reacted = -0.00155 mol (negative because the acid was completely neutralized)

Step 6: Calculate the concentration of H+ ions at the equivalence point.

At the equivalence point, all the acid has been neutralized by the base, so the number of moles of H+ ions is equal to the number of moles of OH- ions. Therefore, the concentration of H+ ions is equal to that of OH- ions at the equivalence point.

moles of OH- ions = moles of NaOH used = 0.00285 mol

volume of solution at equivalence point = volume of water + volume of NaOH used

volume of solution at equivalence point = 25.0 mL + 30.0 mL = 55.0 mL = 0.0550 L

concentration of OH- ions = 0.00285 mol / 0.0550 L

the concentration of OH- ions = 0.0518 M

So, the concentration of H+ ions is also 0.0518 M at the equivalence point.

Step 7: Calculate the pKa of the acid.

The Henderson-Hasselbalch equation can be used to calculate the pKa of the acid:

pKa = pH + log([A-] / [HA])

At the equivalence point, the concentration of the acid is equal to the concentration of its conjugate base, so [A-] / [HA] = 1.

Therefore, pKa = pH + log(1) = pH

At the midpoint of the titration, the pH of the solution is equal to the pKa of the acid. According to the question, at the midpoint of the titration, the pH was 6.50. Therefore, the pKa of the acid is 6.50.

Step 8: Calculate the Ka of the acid.

The Ka of the acid can be calculated from the pKa using the formula:

Ka = 10^(-pKa)

Ka

A thistle funnel is a laboratory glassware that is used for adding liquids to small mouth containers without spilling or splashing.

Thistle funnel is designed with a long, slender stem and a wide conical top that tapers down to a small outlet. The thistle funnel is often used in analytical chemistry for transferring small quantities of liquid from one container to another.

One of the most common uses of a thistle funnel is during the filtration process. When separating solid particles from a liquid, the funnel is placed on top of a filter paper inside a filter flask. The liquid mixture is poured into the funnel, and the liquid is collected in the filter flask while the solid particles are retained on the filter paper.

Another use of the thistle funnel is during the addition of reagents or solutions to a reaction mixture.

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Answer:

When you are in the laboratory and take a direct sniff the chemicals you are using, you run the risk of damaging your mucous membranes or your lungs. When its necessary to smell chemicals in the lab, the proper technique is to cup your hand above the container and waft the air towards your face.

Gas is a naturally odourless substance, but the completely harmless artificial smell is added to make it more detectable. The substance is called mercaptan and gives off a strong sulphur like smell.

Answer:

I think this the asnwer a satellit

Sorry if it incorrect

Have a nice day

Answer:

The Answer is Satellite.

Explanation:

An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon.

Answer:

The greenhouse effect

Explanation:

The greenhouse effect is a straightforward method that heats the Earth's exterior. When the Sun's rays touch the Earth's environment, some of it is bounced back to space and the rest is grasped and re-heated by greenhouse gases. The consumed energy heats the environment and the exterior of the Earth.

As the names suggest, a physical change affects a substance's physical properties, and a chemical change affects its chemical properties. Many physical changes are reversible (such as heating and cooling), whereas chemical changes are often irreversible or only reversible with an additional chemical change.

(hope this helps ^^)

Answer:

dang this hard I don't understand...

Answer:

if im not mistaken that's a jetstream

HCl>H2S>PH3

Explanation:

Acidity is directly proportional to non metallic character. as we move in period (i.e. from left to right) non metallic character increases hence acidic strength increases.

The order of the acidic strength from strongest to weakest: HCl > H₂S > PH₃. Therefore, option (a) is correct.

The acidic strength measures the ability of the acid to lose its H⁺ ion. In general dissociation of acid can be shown as:

HA  →  H⁺ + A⁻

Some examples of strong acids are hydrochloric acid, perchloric acid  (HClO4), sulfuric acid (H2SO4), etc.

For the given acids, with the increase in the electronegativity from phosphorous to chlorine in the period. The bond pair of electrons attract more strongly by the electronegative atom.

Due to this, the weaker bond can easily donate the proton. Hence, HCl has a greater tendency to liberate proton (H⁺) than phosphine (PH₃). After dissociation,  the anion can be easily stabilized by a more electronegative Chlorine atom.  

Therefore, the order of acidic strength for the given acids is HCl> H₂S > PH₃.

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Answer:

1,2million or meter

Explanation:

or 1 million until 7m

Based on the given description, the student is most likely describing a liquid.

As we know, liquids do not have any definite shape, but they do have a definite volume. This is because the particles of matter in a liquid are close together, but they are still able to flow past each other. Due to this property, liquid take the shape of its container.

Some examples of liquids include water, oil, and gasoline.

Other states of matter include solids and gases.

Solids have a definite shape and volume, and the particles of matter in a solid are not able to flow past each other.

Gases have no definite shape or volume, and the particles of matter in a gas are very far apart and are able to move freely.

Thus, the correct answer is liquids.

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Enthalpy, in a technical sense, refers to the internal energy needed to create a system as well as the energy needed to create space for it by establishing its pressure, volume, and displacing its surroundings.

In a thermodynamic system, energy is measured by enthalpy. Enthalpy is a measure of a system's overall heat content and is equal to the system's internal energy plus the sum of its volume and pressure.

A state function that is entirely based on state functions P, T, and U is how enthalpy is also described.

Here the equation used is:

q = n × ΔH

n = Mass / Molar mass

n = 253 / 122.55 = 2.064 mol

q =  2.064 × -91 = -187.82 kJ

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Answer:

58.44 g/mole

Explanation:

To calculate the molar mass of NaCl (sodium chloride), we need to find the sum of the atomic masses of sodium (Na) and chlorine (Cl) off the periodic table.

Atomic mass of Na = 22.99 g/mol

Atomic mass of Cl = 35.45 g/mol

Molar mass of NaCl = Atomic mass of Na + Atomic mass of Cl

= 22.99 g/mol + 35.45 g/mol

= 58.44 g/mol

Therefore, the molar mass of NaCl is 58.44 g/mol.

The molarity of the NaOH solution is 0.0754 M. Answer: 0.0754 M.

Molarity can be defined as the number of moles of solute present in per liter of solution. To calculate the molarity of the NaOH solution, we need to use the given information. Given that 35.22 mL of NaOH solution completely neutralizes a solution containing 0.544 g of KHP.We can use the formula for molarity:

Molarity = (mass of solute / molar mass of solute) / volume of solution in L

First, we need to calculate the number of moles of KHP.Number of moles of KHP = mass of KHP / molar mass of KHP

Number of moles of KHP = 0.544 / 204.22 = 0.00266 mol

Now, we can use the balanced chemical equation for the reaction between NaOH and KHP:

NaOH + KHC8H4O4 → KNaC8H4O4 + H2O

From the equation, we can see that one mole of NaOH reacts with one mole of KHP. Therefore, the number of moles of NaOH used in the reaction is also 0.00266 mol.Since the volume of the NaOH solution used is 35.22 mL, we need to convert it into liters.Volume of NaOH solution used = 35.22 mL = 0.03522 L

Now we can calculate the molarity of the NaOH solution:

Molarity = number of moles / volume of solution

Molarity = 0.00266 / 0.03522

Molarity = 0.0754 M

Therefore, the molarity of the NaOH solution is 0.0754 M. Answer: 0.0754 M.

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The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6. Therefore, there are 6 protons in the nucleus of this element. The correct answer is B. 6.

The atomic number of an element represents the number of protons in the nucleus. In this case, the atomic number is 6, which means there are 6 protons in the nucleus. The atomic mass is the sum of the number of protons and neutrons in the nucleus. Since the atomic mass is 12.01 and the atomic number is 6, we can subtract 6 from 12.01 to get the number of neutrons. This gives us a neutron count of approximately 6.01.

Therefore, The answer is B. 6 protons are in the nucleus of this element.

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The tank contains 200 gallons of brine solution with 3 lb of salt. At t = 0, another solution is poured at 6 gal/min, leaving the tank at the same rate. The incoming rate of salt is 18 lb/gal, and the outgoing rate is 6 gal/min. The solution's volume remains constant.

Given that,Initially, the tank holds 200 gallons of brine solution containing 3 lb of salt.At t = 0, another brine solution containing 3 lb of salt per gallon is poured into the tank at the rate of 6 gal/min.The mixture leaves the tank at the same rate.The volume of the tank remains constant.

Now, let's assume that x(t) be the amount of salt in the tank at time t.Therefore,x(0) = 3 lb.

Now, let's find the differential equation that x(t) follows.

In the tank, the incoming rate of salt = 3 lb/gal x 6 gal/min = 18 lb/min.The outgoing rate is 6 gal/min.

The volume of the tank is constant, and it is equal to 200 gallons.∴ (d/dt)x(t) = (18 - 6x(t)/200) lb/min = (9 - 3x(t)/100) lb/min (On dividing by 2)Separating the variables and integrating, we get:

∫(1/9 - x/300) dx = ∫dt Let u = x/300,

then du = (dx/300)Hence,

∫(1/9 - x/300) dx = ∫\(dt(u/2 - u^2/2)\) = t + C [Where C is the constant of integration]

x/600 - x^2/600 = t + C

Now, we need to find the value of C.

\(C = x(0)/600 - x(0)^2/600C\)

3/600 - 9/360000C = -1/2000

Hence,

\(x/600 - x^2/600 = t - 1/2000\)

Multiplying by 600 on both sides, we get,

\(x - x^2 = 600t - 0.3\)...(1)

Now, we need to find the value of t at which the mixture in the tank contains 6 lb of salt.Substituting x = 6 in equation (1), we get:6 - 6^2 = 600t - 0.3...5 = 600t...t = 5/600 = 0.00833 hours = 0.5 minutes

Therefore, the time at which the mixture in the tank contains 6 lb of salt is 0.5 minutes (approximately).Hence, the correct option is 0.02 min.

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Answer:

1. FeO

2.

3. Ba(NO3)2

4. Ca(OH)²

Explanation:

sorry I didn't knew of no 2 the others were on my book but not that one, and of no 4 the power 2 must be down

Answer: conjugate base of a weak acid

Explanation: If the anion is a conjugate base of a weak acid, the solution would be basic. This is because weak acids do not produce enough hydrogen ions in the solution so does not really affect the acidity, so the conjugate base can react with water in the solution to produce a basic solution.

Answer:

b

Explanation:

i looked it up on Google

Beans are processed through 'nibbing'. During the nibbing process, the roasted cocoa beans are crushed and ground into a paste called cocoa mass or cocoa liquor.

This cocoa mass can then be further processed to separate the cocoa solids from the cocoa butter, which is the fat component of the cocoa bean. The separated cocoa solids and cocoa butter are used in the production of chocolate. Pure cocoa mass (cocoa paste) in solid or semi-solid form is known as chocolate liquor. It includes about equal amounts of cocoa butter and solid cocoa, much like the cocoa beans (nibs) from which it is made. It is made from fermented, dried, roasted, and separated from their skins cocoa beans. To make cocoa mass (cocoa paste), the beans are pulverised.

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The symbοls fοr these elements are:

A chemical element is a chemical substance that cannοt be brοken dοwn intο οther substances. The basic particle that cοnstitutes a chemical element is the atοm, and each chemical element is distinguished by the number οf prοtοns in the nuclei οf its atοms, knοwn as its atοmic number.

Fοr example, οxygen has an atοmic number οf 8, meaning that each οxygen atοm has 8 prοtοns in its nucleus. This is in cοntrast tο chemical cοmpοunds and mixtures, which cοntain atοms with mοre than οne atοmic number.

The chemical elements that meet the given criteria (atοmic number less than 15 and atοmic mass greater than 23.9u) are:

Therefοre, the symbοls fοr these elements are:

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Nanomaterials, whether natural, engineered, organic, or inorganic, offer various applications across industries. However, their environmental health and safety impacts need to be carefully evaluated and managed to mitigate any potential risks.

Understanding their properties, fate, and behavior in different environments is crucial for responsible development, use, and disposal of nanomaterials.

Natural Nanomaterials:

Examples: Carbon nanotubes (CNTs) derived from natural sources like bamboo or cotton, silver nanoparticles in natural colloids, clay minerals (e.g., montmorillonite), iron oxide nanoparticles found in magnetite.

Uses: Natural nanomaterials have various applications in medicine, electronics, water treatment, energy storage, and environmental remediation.

Environmental health and safety impacts: The environmental impacts of natural nanomaterials can vary depending on their specific properties and applications. Concerns may arise regarding their potential toxicity, persistence in the environment, and possible accumulation in organisms. Proper disposal and regulation of their use are essential to minimize any adverse effects.

Engineered Nanomaterials:

Examples: Gold nanoparticles, quantum dots, titanium dioxide nanoparticles, carbon nanomaterials (e.g., graphene), silica nanoparticles.

Uses: Engineered nanomaterials have widespread applications in electronics, cosmetics, catalysis, energy storage, drug delivery systems, and sensors.

Environmental health and safety impacts: Engineered nanomaterials may pose potential risks to human health and the environment. Their small size and unique properties can lead to increased toxicity, bioaccumulation, and potential ecological disruptions. Safe handling, proper waste management, and risk assessment are necessary to mitigate any adverse effects.

Organic Nanomaterials:

Examples: Nanocellulose, dendrimers, liposomes, organic nanoparticles (e.g., polymeric nanoparticles), nanotubes made of organic polymers.

Uses: Organic nanomaterials find applications in drug delivery, tissue engineering, electronics, flexible displays, sensors, and optoelectronics.

Environmental health and safety impacts: The environmental impact of organic nanomaterials is still under investigation. Depending on their composition and properties, they may exhibit varying levels of biocompatibility and potential toxicity. Assessments of their environmental fate, exposure routes, and potential hazards are crucial for ensuring their safe use and minimizing any adverse effects.

Inorganic Nanomaterials:

Examples: Quantum dots (e.g., cadmium selenide), metal oxide nanoparticles (e.g., titanium dioxide), silver nanoparticles, magnetic nanoparticles (e.g., iron oxide), nanoscale zeolites.

Uses: Inorganic nanomaterials are utilized in electronics, catalysis, solar cells, water treatment, imaging, and antimicrobial applications.

Environmental health and safety impacts: Inorganic nanomaterials may have environmental impacts related to their potential toxicity, persistence, and release into ecosystems. Their interactions with living organisms and ecosystems require careful assessment to ensure their safe use and minimize any negative effects.

Understanding their properties, fate, and behavior in different environments is crucial for responsible development, use, and disposal of nanomaterials.

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The molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol. Details on how to calculate molecular mass can be found below.

The molecular mass of a gas can be calculated by using the following expression:

Molecular weight of the gas = mass × volume at STP (22.4L)/ volume of gas

= 0.344 × 22.4/0.2

= 7.7056/0.2

= 38.53g/mol

Therefore, the molecular mass of the gas if 200 mL of gas weighs 0.344 grams at STP is 38.53g/mol.

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The reaction between solid sodium and iron III oxide is:

2 Na(s) + Fe2O3(s) → 2 NaFeO2(s) + 1/2 O2(g).

Sodium is a chemical element with the symbol Na and atomic number 11. It is a soft, silvery-white metal that belongs to the alkali metal group in the periodic table. Sodium is highly reactive, particularly in the presence of water, and is never found free in nature. It was first isolated by Sir Humphry Davy in 1807 using electrolysis. Sodium is an essential element for all living organisms, and it plays a crucial role in various physiological processes, including fluid balance, nerve impulse transmission, and muscle function. Sodium is also widely used in the production of many industrial chemicals, including sodium hydroxide (caustic soda), sodium carbonate (washing soda), and sodium bicarbonate (baking soda). Sodium compounds are also used in the manufacturing of soaps, detergents, paper, and textiles. However, excessive sodium intake can lead to health problems such as high blood pressure and cardiovascular diseases.

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