2) design an experiment to determine the effect of changing the temperature (cold to freezing) of the catalase on the rate of reaction

The fact that an airplane flying due east from an airport will eventually return to its starting point indicates that the Earth is a sphere due to the curvature of the Earth's surface.

How can an airplane flying due east provide evidence for the shape of the Earth?

By continuing to fly east, and with enough fuel, the airplane will eventually reach the same airport it started from. The longest eastward journey would occur from an airport located at one of the Earth's poles. Very short journeys would occur near the equator.

The fact that the airplane returns to its starting point indicates that the Earth is a sphere, as it would not be possible on a flat plane. This phenomenon is due to the curvature of the Earth's surface, which causes the plane's trajectory to follow a circular path along the Earth's surface.

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Answer:  19.54 grams H2H4 remain

Explanation:

The moles of each reagent are calculated by dividing the mass of each by its molar mass (g/mole).  

N2H4:  (93.1g/(32.0 g/mole) = 2.908 moles

N2O4:  (105.7g/92.0 g/mole) = 1.149 moles

The balanced equation says we need  one mole N2O4 per 2 moles N2H4.  This means the 1.149 moles of N2O4 will consume 2*(1.149 moles) = 2.298 moles of N2H4.  Since we start with 2.908 moles, (2.908 - 2.298) = 0.611 moles N2H4 will remain unreacted.  Bummer.  Multiply by the molar mass of N2H4 to obtain 19.55 grams unreacted N2H4.  

Answer:

Molecules of oxygen \(= 6.86 * 10^{23}\)

Explanation:

The balanced equation of reaction between iron and oxygen is  

4 Fe     +  3 O2  → 2 Fe2O3

4 moles of iron react with 3 moles of oxygen.

Mass of one mole of iron is 55.845

number of iron moles in 84.9 grams of solid iron is equal to

\(\frac{84.9}{55.845} \\= 1.52\)

Now 1 mole of iron will react with \(\frac{3}{4} = 0.75\) mole of oxygen

Thus 1.52 moles of iron will react with \(0.75 * 1.52 = 1.14\) moles of oxygen

Number of atoms of oxygen in 1.14 moles

\(1.14* 6.02 * 10^{23}\\\)

\(= 6.86 * 10^{23}\)

The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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In an ecosystem, the  impact of soil Science to the development of Ghana's agriculture is that it provides suitable conditions for root germination and growth.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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​

You could form approximately 5.8 grams of methanol (CH3OH) from the given gas mixture at STP.

Using the Ideal gas equation;

n = PV / RT

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

From the question;

nCO = n / 2

nH2 = n / 2

Then;

n = (1 atm * 7.82 L) / (0.0821 L·atm/(mol·K) * 273.15 K)

n = 0.362 mol

nCO = n / 2 = 0.362 mol / 2 = 0.181 mol

nH2 = n / 2 = 0.362 mol / 2 = 0.181 mol

By stoichiometry;

methanol= nCO = 0.181 mol

Mass of methanol =  0.181 mol * 32.04 g/mol

= 5.8 g

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Answer:

128.4 g

Explanation:

Step 1: Given data

Step 2: Determine the total mass of the sample

The mass percent of element X in X(NO₃)₂ is 52.55%, that is, there are 52.55 g of X every 100 g of X(NO₃)₂. Then, the mass of X(NO₃)₂ that contains 67.50 g of X is:

67.50 g X × 100 g X(NO₃)₂/52.55 g X = 128.4 g X(NO₃)₂

The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist

Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature

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Answer:A Geiger counter is an instrument used for detecting and measuring ionizing radiation. Also known as a Geiger–Müller counter (or Geiger–Muller counter), it is widely used in applications such as radiation dosimetry, radiological protection, experimental physics, and the nuclear industry.

Answer:

Geiger counter

scintillation counter

dosimeter

film badge

detection of ionizing radiation

detection of radiation in the environment

determination of the concentration of radio isotopes in the body

film sensitive to radiation

Explanation:

on edg

Answer:

A generator which spins when electricity Is connected to the motor.

The part or electric motor marked in the given image is called an armature. It is an electromagnet that spins when its is pushed by the magnets either side. Hence, option b is correct.

An electric motor is a device which converts electrical energy to mechanical energy. The majority of electric motors operate by generating force in the form of torque imparted to the motor shaft through the interplay of the magnetic field of the motor and electric current in a wire winding.

Although an electric generator and an electric motor are technically equivalent, an electric generator uses a reversed power flow to transform mechanical energy into electrical energy.

Electric motors can be powered by alternating current (AC) sources like a power grid, inverters, or electrical generators or by direct current (DC) sources like batteries or rectifiers.

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The order of the resonance structures is C > A > B.

In the order of thermodynamic stability we have A > C >D >B

The compounds have one stereogenic center.

The average of all potential resonance structures for a molecule or ion is represented by the hypothetical molecule known as a resonance hybrid.

When a molecule or ion may be described by two or more Lewis structures that only differ in the arrangement of electrons, resonance occurs. In other words, resonance structures have the same atomic arrangement but have different electron distributions.

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Answer: The final pressure inside the tank is 8.41 kPa.

Explanation: We can use the combined gas law to solve this problem, which relates the pressure, volume, and temperature of a gas:

(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.

We are given P1 = 25.0 kPa, T1 = -50 C = 223 K, and V1 is unknown. We also know that the temperature decreases by a factor of three, so T2 = T1/3 = 223/3 K.

To find V2, we need to assume that the steel container is rigid and its volume remains constant. Therefore, V1 = V2, and we can cancel out the volume from the equation:

P1/T1 = P2/T2

Substituting the values, we get:

P2 = P1 * T2 / T1 = 25.0 * (223/3) / 223 = 8.41 kPa

Therefore, the final pressure inside the tank is 8.41 kPa.

Answer:

So if pressure of a gas is increased by 25%, the volume of a gas is decreased by 25%.

Explanation:

the answer is oxygen very easy

Answer:

well, oxidizing, and you can use special produvcts to stop it, and you can get it for cheap

Answer:

C). The previously known outcome of an observation or experiment can be used as solid proof that a newly-created scientific hypothesis is absolutely true.

Explanation:

A Scientific hypothesis is characterized as the proposed explanation or an educated guess about a natural phenomenon on the basis of previous knowledge as well as observation. All the given statements are true regarding a scientific hypothesis that it is 'an educated guess which explains the reason why a specific phenomenon occurs', 'being testable in a manner that could be replicated by other', 'an explanation for a natural phenomenon' except for that  the 'truth of a scientific hypothesis can never be assured completely with a solid proof as it always has chances of being expanded.' Thus, option C is the correct answer.

Answer:

D) it is quantitative observation

The chemist measurement is a quantitative inference and the correct option is option B.

Quantitative means measuring a quantity - putting a value to something.

For example, The rate of a reaction can be measured by measuring the time it takes for a change to happen, such as the time taken for a piece of magnesium ribbon to dissolve in acids of different concentrations.

Qualitative means without determining a value.

This is usually done by making a comparison, e.g. the magnesium dissolves more quickly in this acid than in that one, or making observations like lithium compounds produce a red flame colour while sodium compounds produce a yellow one.

Therefore, the chemist measurement is a quantitative inference and the correct option is option B.

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Answer:

It’s Photosynthesis

Explanation:

Don’t click the file it’s a virus ! Also I hope I helped!

Answer:

2.67 M

Explanation:

Molarity, which is the molar concentration of a substance, can be calculated using the formula;

M = n/V

Where;

M = molarity (M)

n = number of moles (mol)

V = volume (Litres)

Based on the provided information in this question, mass of lithium sulfate (Li2SO4) = 734g, volume = 2.5L

Using mole = mass/molar mass

Molar mass of Li2SO4 = 7(2) + 32 + 16(4)

= 14 + 32 + 64

= 110g/mol

Mole = 734/110

Mole (n) = 6.67moles

Molarity = n/V

Molarity = 6.67/2.5

Molarity = 2.668

Molarity of Li2SO4 in the solution is 2.67 M

Answer:

The molarity of the solution is 2.672\(\frac{moles}{liter}\)

Explanation:

Molarity (M) is a way of expressing the concentration of solutions. It is defined as the number of moles of solute per volume of solution. The Molarity of a solution is determined by the following expression:

\(Molarity=\frac{number of moles}{volume}\)

Molarity is expressed in units \(\frac{moles}{liter}\).

Being the molar mass of Li₂SO₄ 109.94 g/mol, then you can apply the following rule of three: if 109.94 grams are present in 1 mole, 734 grams will be present in how many moles?

\(amount of moles=\frac{734 grams*1 mole}{109.94 grams}\)

amount of moles= 6.68 moles

Then:

Replacing in the definition of molarity:

\(Molarity=\frac{6.68 moles}{2.5 L}\)

and solving you get:

Molarity= 2.672\(\frac{moles}{liter}\)

The molarity of the solution is 2.672\(\frac{moles}{liter}\)

Answer:

Potential energy. Kinetic energy can be stored. ... If we drop the object from the shelf or release the spring, that potential energy is converted back into kinetic energy. Kinetic energy can also be transferred from one body to another in a collision, which can be elastic or inelastic.

The mass of 2.75 L of isobutane (C₄H₁₀) gas at STP is 7.13 g

To determine the mass of 2.75 L of isobutane,

First, we will determine the number of moles of the isobutane present at STP.

From the equation of ideal gas, we have that

\(PV=nRT\)

∴ \(n = \frac{PV}{RT}\)

Where P is the pressure

V is the volume

n is the number of moles / amount

R is ideal gas constant

and T is the temperature

From the question,

V = 2.75 L

At STP

P = 1 atm

R = 0.0821 atm L/mol K

T = 273 K

Putting these values into the equation, we get

\(n = \frac{1 \times 2.75}{0.0821 \times 273}\)

n = 0.1227 moles

∴ The number of moles of isobutane present is 0.1227 moles

Now, for the mass

Using the formula

\(Number \ of \ moles =\frac{Mass}{Molar \ mass}\)

Then,

Mass = Number of moles × Molar mass

Molar mass of isobutane = 58.12 g/mol

∴ Mass of the isobutane = 0.1227 moles × 58.12 g/mol

Mass of the isobutane = 7.13 g

Hence, the mass of 2.75 L of isobutane (C₄H₁₀) gas at STP is 7.13 g

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Answer: Oxygen

Explanation: Its found on the periodic table as an element.

number 1 is...

Explanation:

B (i think)

Answer:

The first image = double replacement

Second = single replacement

Third = Decomposition

Fourth = Combination

Explanation:

1. a color from each pair is being swapped and replacing each other so there is a double replacement

2. only the blue and the red are changing places so it is single replacement

3. the pair is being separated (decomposed)

4. the red and green are coming together (combined)

The answer is A: Oil.

Answer:

Explanation:

A. Oil

hope it helps!

We can actually deduce here that the purpose of this assignment is to teach students about decomposition reactions and allow them to determine the percent yield.

By performing the experiment, students will gain a better understanding of the concepts involved and how they relate to their overall learning.

The specific focus of this assignment is the decomposition of sodium bicarbonate (NaHCO3) to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). The unbalanced chemical equation for this reaction is:

NaHCO3 (s) + heat -> Na2CO3 (s) + H2O (g) + CO2 (g)

To understanding the reaction itself, students will also learn about the concept of percent yield. Percent yield is a measure of the efficiency of a chemical reaction and is calculated by dividing the actual yield of the desired product by the theoretical yield, then multiplying by 100.

This calculation allows students to assess how well the reaction proceeds in terms of producing the expected amount of sodium carbonate.

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Answer:

lithosphere (land)

hydrosphere (water)

biosphere (living things)

atmosphere (air).

Answer:

The balanced equation for the reaction of NH3 and O2 is: 4 NH3 + 5 O2 -> 4 NO + 6 H2O.

From the balanced equation, it can be determined that for every 4 moles of NH3, 5 moles of O2 are needed to react.

To convert 14.8 g of NH3 to moles, the following calculation can be used: 14.8 g NH3 / 17.03 g/mol = 0.87 moles NH3.

Therefore, the number of moles of O2 needed to react with 14.8 g of NH3 is: 0.87 moles NH3 * (5 moles O2 / 4 moles NH3) = 1.09 moles O2.

To convert moles of a substance to grams, the following calculation can be used: moles x molar mass (in g/mol)

Therefore, the number of grams of O2 needed to react with 14.8 g of NH3 is: 1.09 moles O2 * (32.00 g/mol) = 35.1 g O2

Answer:

The answer to the question is true.

Given the flow rate and the amount of nitroglycerine contained in the IV bag, the patient should receive 63 milliliters per hour.

Rate of prescribed dose by IV:

2.10×10²ug/min = 210 ug/min

Available:

50 mg nitroglycerin= 50000 ug

Available Volume: 150ml

Hence,

50000 ug = 250 ml

and volume for 210 ug = x

We cross multiply to find x

x = 210 × 250/50000

x = 1.05ml

Meaning that in a single minute, 1.05mL is been infused into the patient

Now, for an hour, ( 60 minutes ) the volume infused will be;

1 min = 1.05mL

60 min = x

We cross multiply to find x

x = 1.05 × 60/1

x = 63mL

Therefore, given the flow rate and the amount of nitroglycerine contained in the IV bag, the patient should receive 63 milliliters per hour.

What is nitroglycerin?

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