URGENT!!!! Write a lab conclusion on ionic and molecular compounds

Answer:

2.15 L

Explanation:

We can use the combined gas law to answer this:

P1V1/T1 = P2V2/T2

where P, V, and T are the Pressure, Volume, and Temperature (in Kelvin) for the initial (1) and final (2) states.  We may assume the pressure remains the same between both states (1 atmosphere. or standard pressure).  Ci=onvert the Celcius temperatures into Kelvin by add 273.15 to the C value.

We want the original volume, V1.  Rearrange the equation to solve for V1:

   V1 = V2(P2/P1)(T1/T2)

Note how the pressure and temperature variables are formatted:  as ratios.  This allows us to more easily visualize how the changes in both will impact the value of V1.  A rise in temperature between T1 and T2 would mean that the ratio (T1/T2) would be less than 1, so the initial volume, V1, would be smaller than the final volume, V2.  The raio of the pressures P2/P1 simply reduces to 1, since they are the same.  So even before we get our a calculator, we can predict that V1 will be smaller than V2.  

Enter the data:  V1 = (2.75L)*(1)*(273.15K/350K)

The pressure and temperature units cancel, leaving only voulume (Liters).

  V1 = 2.15L

This is less than 2.75L, which is what we already expected.  The initial volume is 2.15 L.

If an elephant of mass 500kg stands on the ground, each foot has an area of 0.08m2, the pressure exerted on ground is  15,625 Pa.

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid. A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.

Atmospheric pressure, which at sea level is roughly 15 pounds per square inch, is the weight of the atmosphere pressing down on each unit area of the Earth's surface. One pascal is equal to one newton per square meter when expressed in SI units, which is how pressure is calculated. Nearly 100,000 pascals of atmospheric pressure are present.

We have given that mass is 500kg and area of each leg is 0.08m²

The formula for Pressure is

Pressure = Force/Area

Let us find the weight first

⇒ weight = mass × g

= 500kg × 10N/kg

= 5000N

Total contact area = 0.08m² × 4

= 0.32m²

Finally, we will calculate the pressure

⇒ Pressure = Force/Area

= 5000N/0.32m²

= 15625 Pa

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Answer:

WHY DO YOU NEED HELP HUH

DON'T CHEAT READ AND STUDY

Explanation:

Answer:

It's C

Explanation:

A lady bug rests on the bottom of a tin can that is being whirled horizontally on the end of a string. Since the ladybug, like the can, moves in a circle, there must be a force acting on it.The force that acts on the ladybug in this scenario is called the centripetal force.

The centripetal force is responsible for keeping an object moving in a circular path and is directed toward the center of the circular motion. In this case, the string exerts the centripetal force on the ladybug. As the can moves in a circle, the string pulls the can inward, providing the necessary centripetal force to keep the ladybug moving in a circular path. The tension in the string provides the force required to maintain the ladybug's circular motion. According to Newton's second law of motion, the centripetal force required to keep an object moving in a circle is proportional to the mass of the object and the square of its velocity, divided by the radius of the circle. In the case of the ladybug on the can, the string applies the appropriate centripetal force to maintain the ladybug's circular motion despite the absence of any noticeable external force acting on it.

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The dilution of the final solution is 1/32 dilution. Option (a) is the correct answer.

To work out the general weakening of the last arrangement, we really want to duplicate the weakening elements of each step.

The primary weakening is a 1/8 weakening, and that implies that the centralization of the arrangement is diminished by a component of 1/8. Hence, the resultant arrangement is 1/8 of the first focus.

The subsequent weakening is a 1/4 weakening, and that implies that the convergence of the resultant arrangement is decreased by an element of 1/4.

To find the general weakening, we increase the weakening variables of each step:

1/8 x 1/4 = 1/32

Subsequently, the weakening of the last arrangement is 1/32 weakening. Choice (a) is the right response.

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To determine the order of the reaction with respect to B in the given reaction, we can use the rate law equation that describes how the initial concentrations of reactants A and B affect the rate of the reaction. The general form of the rate law equation is: rate = k[A]^m[B]^n where k is the rate constant, [A] and [B] are the initial concentrations of reactants A and B respectively, and m and n are the reaction orders with respect to reactants A and B respectively. The overall reaction order is the sum of the individual reaction orders (i.e. overall order = m + n). In the given experiments, the rate of the reaction is given along with the initial concentrations of reactants A and B in each experiment.

Experiment A / M B / M rateB / (M/sec) 1 0.00088 0.00061 0.0000509 2 0.00088 0.00953 0.1941The rate law equation can be rewritten in terms of the given data as: rateB / (M/sec) = k [A]^m [B]^n. For Experiment 1, the initial concentrations of reactants A and B are 0.00088 M and 0.00061 M respectively. The rate of the reaction is 0.0000509 M/sec.rateB / (M/sec) = k [A]^m [B]^n0.0000509 = k (0.00088)^m (0.00061)^n. For Experiment 2, the initial concentrations of reactants A and B are 0.00088 M and 0.00953 M respectively.

The rate of the reaction is 0.1941 M/sec. rateB / (M/sec) = k [A]^m [B]^n0.1941 = k (0.00088)^m (0.00953)^n. Dividing the two equations, we get:0.1941 / 0.0000509 = (0.00953)^n / (0.00061)^n Simplifying, we get:3632.7 = (15.6)^n. Taking the logarithm of both sides, we get: log 3632.7 = n log 15.6Solving for n, we get: n = log 3632.7 / log 15.6n ≈ 2.00Therefore, the order of the reaction with respect to B is 2.00.

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Answer:It represents a time line of something like something happend in 1972 and 1952 things like that. Hope it helps!

Explanation:

Answer:

False

Explanation:

Megafauna are large animals that roamed the Earth during the Pleistocene Epoch, 1.6 million - 10,000 years ago.

1) The speed of the particles would increase when heated

2) The balloon would expand when heated and contract when cooled.

3) On a hot day, the pressure of the gas in a beverage increases

4) The mercury thermometer works by expanding or contracting in response to temperature change.

We know that one of the effects of temperature is that it is able change the molecular motion of an object. Thus the molecules of an object are able to move faster when heat is applied and they are able to slow down when the heat is removed.

This is why a balloon would have a greater volume when the temperature is increased as the gas molecules spread out. The volume would reduce or decrease when the temperature is reduced.

Also, on a hot day, a beverage would tend to be more fuzzy as the pressure of the gas in the beverage would increase as the temperature is increased.

Lastly, when we use the mercury thermometer, the volume of the mercury would increase and this is the reason for the expansion of the mercury during temperature measurement.

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Answer:

a?

Explanation:cause if organism w is a fossil and organism y is a rock the rock is way older than a fossil so a

Answer:

the answer is C

Explanation:

just did the test and Y, and U are in the same layer...so both were alive over the same time span.

Answer:

D. Sound waves transfer energy through the vibration of particles in mediums.

Explanation:

It can be concluded from the experiment that sound waves will only propagate through vibration of particles in mediums.

The particles of the medium is the air.

Option A ; Sound waves are transverse waves; while this might be true or not, we cannot ascertain that through this experiment described.

Option B: this negates the conclusion that should be drawn from the experiment.

Option C: we cannot draw this sort of conclusion from such an experiment as this.

Therefore, the right choice is that, sound waves transfer energy through the vibration of particles in mediums.

When gathering glassware and equipment for an experiment, we must follow safety protocols.

Following protocols must be followed while handling glassware and equipment:

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Answer:

1 atom of zirconium

Explanation:

Zirconium sulfide or zirconium disulphide can be written as ZrS2.

The central carbon atom in glycine has four atoms and two lone pairs of electrons. Therefore, the electron geometry of the central carbon atom is octahedral, with bond angles of 90°, 180°, and 120°.The next step is to determine the molecular geometry. The molecular geometry in glycine is distorted tetrahedral, with bond angles of 120°.The approximate c-n-h bond angle in glycine is 120°.

The VSEPR theory defines that lone pairs occupy larger regions in space than bonding pairs. The VSEPR theory assumes that electron pairs are situated around the central atom in a way that minimizes electron-pair repulsions to form a shape that maximizes the distance between them. Therefore, in glycine, the approximate c-n-h bond angle is 120°. Thus, the correct option is (c) 120°.Explanation:The Lewis structure of Glycine:Glycine has 4 atoms and 2 lone pairs of electrons. It is an amino acid with NH2 as the amino group and COOH as the carboxylic group.Glycine Lewis structureGlycine molecule has two -CH2 groups on either side of the central carbon atom, to which the amino group and carboxyl group are attached. To determine the shape of the molecule, it is essential to understand the Lewis structure of the molecule. The next step involves the determination of the number of atoms and electron pairs around the central carbon atom.The VSEPR theory defines that the geometry of the molecule depends on the electron pairs' number in the central atom. The central carbon atom in glycine has four atoms and two lone pairs of electrons. Therefore, the electron geometry of the central carbon atom is octahedral, with bond angles of 90°, 180°, and 120°.The next step is to determine the molecular geometry. The molecular geometry in glycine is distorted tetrahedral, with bond angles of 120°.The approximate c-n-h bond angle in glycine is 120°.

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Answer:

2497 moles

Explanation:

human body = 75000 g

60% is H2O

so H2O = 0.60 x 75000 g =45000 g

molar mass of H2O =18.02

so

45000 g/18.02 g/mole = 2497 moles to correct sig fig

The molar concentration of a solution containing 469 grams of C6H12O6 in 82 milliliters of water is 31.7M.

The number of moles = 469g ÷ 180.156g/mol = 2.6mol

Volume of water in litres = 82/1000 = 0.082L

Concentration of solution = 2.6mol ÷ 0.082L = 31.71M

Therefore, the molar concentration of a solution containing 469 grams of C6H12O6 in 82 milliliters of water is 31.7M.

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Answer:

D.) All of the above

Explanation:

Anxiety can cause sweating, chaky hands, headaches etc

When you have a known concentration of acid and an unknown concentration of base, you can use an acid-base titration to determine the concentration of the base.

The experimental procedure for this would be as follows:Procedure:1. Measure a known volume of the acid (let's say 25 mL) into a flask using a pipette.2. Add a few drops of an indicator (phenolphthalein, for example) to the flask.3. Fill a burette with the base solution and record the initial volume of the base.4. Slowly add the base solution to the acid while stirring the flask.

The base solution should be added dropwise once you are close to the equivalence point. The point at which the indicator changes color (from colorless to pink) indicates the endpoint of the titration.5. Record the final volume of the base.6. Repeat the titration two more times.7.

Calculate the concentration of the base solution based on the volume of the base solution and the known concentration of the acid.

To calculate the concentration of the base solution, you would use the following formula: Molarity of base solution = (mL of base used x molarity of acid) / mL of acid used

For example, if you used 10 mL of base and 25 mL of acid with a concentration of 0.1 M, the molarity of the base would be:Molarity of base solution = (10 mL x 0.1 M) / 25 mL= 0.04 M

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The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.

Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis

The balanced chemical equation represents the mole ratio in which the chemicals combine.

In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.

Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.

But this quantity of Al has a mass in grams of

m = n × Mr

   = 8.70 mol × 27g/mol

   = 234.9 g

Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

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Answer:he final equation will be C3H8 + 502 ----> 3CO2 + 4H20.

Explanation:There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. The final equation will be There will be 10 oxygens on the products side and 2 on the reactants so to balance these out, we multiply the 02 on the reactants side by 5. The final equation will be C3H8 + 502 ----> 3CO2 + 4H20.

Answer:

a. 408g de NH3 son necesarios

b. 2.42x10²³ moléculas de agua se obtienen

Explanation:

a. Basados en la reacción, 2 moles de NH3 producen una mol de (NH2)2CO. Para resolver esta pregunta debemos convertir la masa de (NH2)2CO a moles. Estas moles a moles de NH3 y su respectiva masa:

Moles (NH2)2CO -Masa molar: 60.06g/mol-

720g * (1mol / 60.06g) = 11.99 moles (NH2)2CO

Moles NH3:

11.99 moles (NH2)2CO * (2mol NH3 / 1mol (NH2)2CO) = 23.98 moles NH3

Masa NH3 -17.031g/mol-:

23.98 moles NH3 * (17.031g / mol) = 408g de NH3 son necesarios

b. 1mol de CO2 produce  1mol de agua. Se debe convertir el volumen a moles usando PV = nRT. Estas moles = Moles de agua. 1mol = 6.022x10²³ moléculas:

Asumiendo STP:

PV = nRT; PV / RT = n

Donde P = 1atm a STP

V = 9L

R = 0.082atmL/molK

T = 273.15K a STP

1atm*9L / 0.082atmL/molK*273.15K = n

n = 0.402 moles CO2 = Moles H2O

Moléculas:

0.402 moles agua * (6.022x10²³ moléculas / 1mol) =

Secondary consumers are organisms that primarily feed on herbivores or other primary consumers.

They occupy the next trophic level above the primary consumers in a food web. They obtain energy by consuming the primary consumers and play an important role in regulating the population of herbivores.

Examples of commonly observed secondary consumers include:

Carnivorous mammals: Animals such as wolves, lions, and tigers that feed on herbivores like deer, zebras, or gazelles.

Birds of prey: Species like eagles, hawks, and owls that consume small mammals, reptiles, or other birds.

Carnivorous fish: Fish like pike, barracuda, or bass that prey on smaller fish or aquatic invertebrates.

Predatory insects: Insects such as spiders, mantises, or dragonflies that feed on other insects, including herbivorous insects.

In a specific food web, the identification of secondary consumers would depend on the specific organisms present and their feeding interactions. It would be necessary to analyze the trophic relationships among the organisms in the food web to determine the secondary consumers accurately.

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The approximate osmotic pressure of a 0.118 m aqueous solution of LiCl at 15 °C is 2128 torr.

The approximate osmotic pressure of a 0.118 m aqueous solution of LiCl at 15 °C can be calculated using the formula:

π = MRT

Where:

π = osmotic pressure

M = molarity of the solution

R = gas constant (0.0821 L·atm/mol·K)

T = temperature in Kelvin

First, we need to convert the temperature from Celsius to Kelvin:

T = 15 °C + 273.15 = 288.15 K

Next, we can plug in the values into the formula:

π = (0.118 mol/L)(0.0821 L·atm/mol·K)(288.15 K)

π = 2.80 atm

Finally, we need to convert the osmotic pressure from atm to torr:

1 atm = 760 torr

π = (2.80 atm)(760 torr/atm)

π = 2128 torr

Therefore, the approximate osmotic pressure of a 0.118 m aqueous solution of LiCl at 15 °C is 2128 torr.

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The capacity of stationary phases used in high performance liquid chromatography (HPLC) to distinguish between polar column and nonpolar chemicals can be used to classify them.

Extremely polar chemicals, which are difficult to separate under reversed-phase conditions, can be retained and separated successfully using hypercarb columns. This application has shown that: Polar chemical retention is good in hypercarb columns. The techniques created on Hypercarb columns are solid.

(We define a bond to be polar if there is a difference between the electronegativity of the atoms in the bond that is more than 0.4. The bond is effectively nonpolar if the difference in electronegativity is smaller than 0.4.) The molecule is nonpolar if there are no polar bonds.

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In the given reaction  ₉₆²⁴⁶Cm + ₆¹²C ---> 4 ¹on + X  it shows an example of an artificial transmutation reaction.

An artificial transmutation reaction may resemble this. The method of causing nuclear reactions by blasting atomic nuclei with high-energy particles like ions or neutrons is referred to as artificial transmutation.

In this instance, the transmutation is induced by bombarding the carbon nucleus (C) with additional particles or a high-energy beam, resulting in the production of the following products: Element X and 4 1on (Helium-4)

Blasting an element with a basic particle, an element can be artificially transmuted into a different element.

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Answer:

weight force (i.e. the weight of something)

the force of a bat on the ball.

the force of the hair brush on hair when it is being brushed.

the force of your foot pushing on the pedal when you ride your bike.

Explanation:

Answer:

Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and a rubber ball dropped together. Air resistance causes the feather to fall more slowly, while the ball falls more fast.

Answer:

reaction to cold pack: change in temperature

Evidence of a chemical reaction etc is change in composition

Explanation: composition is atoms changeing and etc, which is a chemical reacton i think. Change in temperture is alsoa  chemical reaction but cold packs

Answer:

Cold pack: absorbs heat (endothermic reaction)

Hot pack: releases heat ( exothermic reaction)

Explanation:

when a cold pack/hot pack is shaken, water mixes with the chemicals in the outer layer and reacts to release or absorb heat.

Answer:

Primary - Mouse , Secondary-Snake

Answer:

A Caterpillar is a primary consumer!

A mouse is secondary

and foxes and snakes are tertiary consumers!

Explanation:

Alright so lets looks back

Caterpillars eat leaves and grass called "Producers"

Mouses eat the primary producers and generically make less energy

Foxes and Snakes are the ones who eat the secondary consumers, so they are called tertiary consumers.

Hope this helps!