Please help me with these. I'm trying to finish this course today and I don't want to fail this assignment. The questions are attached.

Answer:

it is 12

Explanation:

because matter can put be created or destroyed

Answer:

C.

Explanation:

A mixture contains two or more substances.

A compound contains elements in a fixed ratio.

P = Element

Q = Compound

R = Mixture

The correct order is C.

The carbon dioxide (CO2) can stimulate ventilation by binding both peripheral and central chemoreceptors. When CO2 levels rise in the body, it can cross the blood-brain barrier and stimulate the central chemoreceptors located in the brainstem, as well as the peripheral chemoreceptors located in the carotid bodies.

This results in an increase in ventilation, as the body attempts to eliminate excess CO2 and maintain normal pH levels in the blood.
Peripheral chemoreceptors are located in the carotid and aortic bodies, which are sensitive to changes in arterial blood gases.

They are responsible for detecting changes in oxygen (O2), CO2, and pH levels in the blood. Central chemoreceptors, on the other hand, are located in the brainstem and are mainly responsive to changes in CO2 levels.

When CO2 levels increase in the body, it can stimulate both peripheral and central chemoreceptors, leading to an increase in ventilation.
CO2 is a chemical that can stimulate ventilation by binding both peripheral and central chemoreceptors. This mechanism helps the body maintain normal pH levels in the blood and prevent respiratory acidosis.

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1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg

The volume of iceberg = 7670 cubic feet.

Density of ice = 0.917 g/cm\(^{3}\)

so, Density is given by,

Density = mass / volume

density of ice =  (0.917 /1000) kg/cm\(^{3}\)

1 cm\(^{3}\) = 0.00003531 ft\(^{3}\)

therefore,

0.000917 kg/cm\(^{3}\) = (0.000917 × 0.00003531 ) kg/ft\(^{3}\)

                            = 0.0000000324 kg/ft\(^{3}\)

now,putting the values in formula , we get,

Density = mass / volume

mass = density × volume

         = (0.0000000324 × 7670 ) kg

         = 0.0002483 kg

Hence,An iceberg has a volume of 7670 cubic feet. The mass of the ice (in kg) composing the iceberg is 0.0002483 kg.

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To calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of tungsten, we can use the Heisenberg uncertainty principle Average speed is 0.17% .

Heisenberg principle states that the product of the uncertainty in position and momentum of a particle cannot be less than a certain value, h/4π, where h is Planck's constant.
In this case, we are interested in the uncertainty in speed, which is related to momentum by the equation p = mv, where m is the mass of the electron. We can assume that the electron is confined to a spherical region of radius equal to the radius of the tungsten atom, which is about 1.37 Atom (1 Atom = 10⁻¹⁰ m).
The average orbital speed of the electrons in a tungsten atom is about 2.8 x 10⁶ m/s. To find the least possible uncertainty in speed, we can use the equation Δp Δx ≥ h/4π, where Δx is the uncertainty in position, which we can take to be the radius of the atom.
Δp = Δ(mv) = m Δv, since the mass of the electron is constant.
Δv ≥ h/4πmΔx
Δv ≥ (6.626 x 10⁻³⁴ J s)/(4π x 9.109 x 10⁻³¹ kg x 1.37 x 10⁻¹⁰ m)
Δv ≥ 4.63 x 10³ m/s
The least possible uncertainty in the speed of an electron in an atom of tungsten is about 0.17% of the average speed (4.63 x 10³ m/s divided by 2.8 x 10⁶ m/s, multiplied by 100%), which we can round to two significant digits as 0.17%.

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Answer:

Molar mass of gas = 160 g/mol

Explanation:

Given data:

Mass of sample gas = 1.28 g

Temperature of sample gas = 127°C (127+273 = 400K)

Pressure of sample gas = 1 atm

Volume of sample gas = 0.250 L

Molar mass of gas = ?

Solution:

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K

Now we will put the values in formula.

1 atm × 0.250 L = n × 0.0821 atm.L/ mol.K ×400K

0.250 L.atm   = n ×32.84atm.L/ mol

n = 0.250 L.atm/32.84atm.L/ mol

n = 0.008 mol

Molar mass of gas:

Number of moles = Mass/molar mass

0.008 mol = 1.28 g / molar mass

Molar mass = 1.28 g / 0.008 mol

Molar mass = 160 g/mol

Answer:

evaporation

Explanation:

When water is heated, it evaporates. The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor. Heat from the sun, or solar energy, powers the evaporation process.

Answer:

● They have more than two carbons that are bonded to only one other

Explanation:

They have carbons bonded in a single row from one end of the molecule to the other end of the molecule. ... The straight-chain alkane has two more hydrogen atoms than the cycloalkane

Answer:

D. They have carbons bonded in a single row from one end of the molecule to the other end of the molecule.

Explanation:

I got it wrong when I chose C - They have more than two carbons that are bonded to only one other carbon. So yeah p.s UNUS ANNUS

Answer: A.

Explanation: When light passes through a small hole, it creates an inverted image on the opposite side. In this case, since the arrow is pointing up, the inverted image will appear pointing down on the opposite wall. Furthermore, since the box has a hole on its left side, the inverted image will be shifted towards the left.

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Volcanoes are closely associated with plate tectonic activity. Most volcanoes, such as those of Japan and Iceland, occur on the margins of the enormous solid rocky plates that make up Earth's surface.

Hope it helps!

Brainliest pls....

Follow me! ;)

Answer:

They are closely related the most to Plate Tectonics. They're usually at Convergent plate boundaries.

Explanation:

Hope this helped! Sorry if I'm wrong.

-Bella

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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The equilibrium constant for the reaction is determined by using the equation ΔG° = -RT ln(K) and the given ΔG° value of -34.5 kJ.

The equilibrium constant can be calculated by using the equation ΔG° = -RT ln(K), where ΔG° is the standard Gibbs free energy change, R is the gas constant, T is the temperature in Kelvin, and K is the equilibrium constant. By rearranging the equation, we can solve for K.

To determine the equilibrium constant, substitute the given ΔG° value (-34.5 kJ) into the equation and calculate K using the known values of R (gas constant) and T (temperature in Kelvin).

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Answer:

The molecular weight of CO is 28.01g/mole.

Answer:

LiOH

Explanation:

LiOH has the tag "aq" which stands for aquatic.

Our answer is LiOH.

Solution

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Precautions with Potentiometer:

1. emf of the cell connecting in primary circuit must be more than or equal to the emf of the cell of secondary circuit otherwise zero deflection can not be obtained.

2. All the high potential points or positive terminals should be connected at A

3. Balancing length should be calculated from A

4. Area of cross-section of the wire should be uniform otherwise potential gradient will not be constant.

5. Current should not be passing through potentiometer wire for a long time otherwise this will heat up the wire and will changes its resistance and hence potential gradient will also changed.

The goodyear blimp is filled with nearly 203,000 cubic feet of Helium gas.

The helium inside the Goodyear blimp is considered to be an ideal gas.

The ideal gas law relates the pressure, volume, number of moles, and temperature to each other for an ideal gas, which is a reasonable assumption for the noble gases.

In such a case, all gases obey an equation of state known as the ideal gas law: PV = nRT, where n is the number of moles of the gas and R is the universal (or perfect) gas constant, 8.3144626 joules per kelvin per mole.

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Answer:

Lead

Explanation:

While taking sample from flint's distillery, theybfoind 13000 ppb or parts per billion lead in the water itself

Answer:

Liquid isopropanol.

Explanation:

Liquid isopropanol will evaporate earlier than water because the boiling point of isopropanol is less than water. That liquid which have high boiling point require more heat energy for change into vapor state as compared to those liquids that has low boiling point. The isopropanol has boiling point i.e. 82.5 °C while on the other hand, water has boiling point i.e. 100 °C so we can say that isopropanol will evaporate first.

The liquid that will be the first to evaporate within 5 minutes is; Liquid Isopropanol

We have the 2 liquids as;

Liquid Isopropanol

Liquid water

Now, since we are dealing with the one that will evaporate within five minutes, we need to know their boiling points.

From online research;

Boiling point of liquid isopropanol is 82.5°C

Boiling point of liquid water is 100°C

Now, we are told that the same energy is transferred for both liquids. However, boiling point of the liquid with the lower boiling point will be achieved first and as a result will evaporate first since the next stage after boiling point is evaporation of steam.

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According to the research, a vapor is a substance that is in the gas phase at a temperature at which it would normally be a solid or liquid.

It is the state in which a gas is found when it is at a level below its critical point.

A vapor is the result of heating an element that, at room temperature, is usually a solid or liquid.

Therefore, we can conclude that according to the research, a vapor is a substance that is in the gas phase at a temperature at which it would normally be a solid or liquid.

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Answer

find out the number of moles and use the molar ratio (numbers in front of formulas (in this case they are all 1) to determine how many moles of each product you are going to get theoretically

n=m/M is the equation to use to get moles here

30.8 gm/32.04 g/mol=0.9612 moles of the methanol and also of the formaldehyde so

0.9612 moles of the formaldehyde x molar mass (M) 30.73 g/mol= 29.54 gm which is the theoretical yield you already have the actual yield of 24.7 gm

then divide the actual by the theoretical to get the % yield which is 83.6%

Explanation:

Answer:

5.3 mL

Explanation:

We solve this problem using Archimede's principle, which states that the volume displaced by a submerged object is equal to the volume of the object.

With that in mind we calculate the volume of water displaced by the medallion:

As the medallion displaced 5.3 mL of water when submerged, the volume of the medallion is also 5.3 mL.

Answer: ITS D

Explanation: i was just looking answers for my test and this is my sisters account

The pressure of gas in a container is measured using a manometer with a tolerance of 0.509 atm. The pressure of an enclosed gas is measured using an open-end mercury manometer, like the one in this image.

However, unless clearly stated otherwise, a U-shaped tube that is partially filled with fluid is what is typically meant when using the term "manometer." To demonstrate how air pressure affects a liquid column in a laboratory experiment, you can quickly construct this kind of manometer. A manometer is a gauge used in science to measure pressure. The fourth and most basic state of matter is gas (the others being solid, liquid, and plasma). A pure gas might contain a single atom (e.g. a noble gas like neon).

The pressure of gas in a container is measured using a manometer is

(354*0.975 )- 344.65 = 0.509 atm.

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A manometer with a tolerance of 0.509 atm is used to measure the pressure of gas in a container.

However, The open-tube manometer is a U-shaped tube that is partially filled with fluid, usually mercury or water. Which is commonly intended when using the term "manometer" unless it is specifically indicated otherwise. This form of manometer can be easily built to demonstrate how air pressure influences a liquid column in a laboratory experiment.  The pressure that is measured is related to the difference in height of the fluid at the two ends of the U-shaped tube.

Finally pressure of gas in a container is measured using a manometer is

(354×0.975 )- 344.65 = 0.509 atm.

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Explanation:

C = Xv

v = C/X = (3.00 * 10^8 m/s) / (5.88 * 10^8 m)

= 0.51 Hz.

Answer:

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define RxN

Mg (s) + CO₂ (g) → MgO (s) + C (s)

Step 2: Balance RxN

2Mg (s) + CO₂ (g) → 2MgO (s) + C (s)

The molarity of the lithium chloride solution is 0.671 M.

Molarity is a unit of concentration used to measure the amount of solute dissolved in a given volume of solution. It is defined as the number of moles of solute dissolved in one liter of solution, and its unit is moles per liter (mol/L).

To calculate the molarity of the solution, we need to divide the number of moles of solute by the volume of solution in liters.

Molarity = moles of solute/volume of solution in liters

In this case, we are given that 1.59 mol of lithium chloride is dissolved in enough water to make 2.37 L of solution. Therefore, the molarity will be calculated as

Molarity = 1.59 mol / 2.37 L

Molarity = 0.671 M

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An example of where dry deposition would be higher than wet deposition is Mediterranean regions like Greece, Malta, Cyprus.

An example of where wet deposition would be higher than dry deposition are rainforest areas.

Dry deposition is described as the free fall to Earth directly from the atmosphere of atmospheric trace gases and particulate matter.

Wet deposition is the process whereby atmospheric gases mix with suspended water in the atmosphere and are then washed out through rain, snow or fog.

Wet deposition includes rain, sleet, snow, or fog that has become more acidic than normal while dry deposition is known as another form of acid deposition, and this is when gases and dust particles become acidic.

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