Many chlorophytes are unicellular, but others are larger and more complex. What does this indicate regarding the evolutionary history of chlorophytes?.

Answer:

Ans no 1. As magnesium used to react with oxygen and due to the reaction the mass (weight) of magnesium increases , this reaction between oxygen and magnesium which form magnesium oxide in the air by forming white smoke increases the mass of magnesium

Answer:

Explanation:

NH3 + H2O ⇌ NH4  + OH-

0.35                              0.35

-log[OH-] = -log0.35 = 0.46 = pOH

14 - 0.46 = 13.54 = pH

The aspect of the experiment that is missing from the experimental design for the determination of the boiling points of water and ethanol is deciding on the appropriate equipment.

The correct option is C.

Experiments are scientific procedures that are designed to test a hypothesis in order to prove or disprove the hypothesis.

Also, experiments are done to make discoveries as well as to repeat or confirm a fact.

In designing an experiment, the following components of the experimental design are necessary:

For example, in an experiment to determine the boiling points of water and ethanol, appropriate equipment such as a thermometer is needed.

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Complete question:

A student decides to conduct an investigation to determine the boiling points of water and ethanol. The student will heat samples of water and ethanol, and measure the temperature at which the samples boil. The student will conduct the investigation three times. Which aspect is missing from the experimental design?

determining the procedure

determining what data to collect

deciding on the appropriate equipment

deciding on the number of trials to perform

Electrical Bonding Evidence Quick Check

1. melting point, boiling point, surface tension, and vapor essence

2. deciding on appropriate equipment

3. mix ice with water until equilibrium is reached but some ice remains that is no longer melting

4. it ensures that results are accurate

5. the student should take the average of the results from all four trials

hope i helped ya muah xx

The water molecule has a total of 10 protons and 10 electrons (8 from the oxygen atom and 1 from each of the two hydrogen atoms). Since it has the same number of protons and electrons, the water molecule is neutral. The electron cloud model shows where electrons are in a molecule.

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The characteristic of a mineral that is NOT found in volcanic glass and the reason it is not considered a mineral is the orderly crystalline structure.

Volcanic glass is a non-crystalline mineraloid that is formed as a result of the rapid cooling of lava. Types of glass include obsidian, pumice, and tuff. The lack of an orderly crystalline structure is the primary characteristic that separates volcanic glass from minerals. Mineral characteristics include a natural, inorganic, crystalline structure that is defined by chemical composition and atoms that are arranged in a regular, repetitive pattern.

Volcanic glass, on the other hand, lacks this kind of ordered crystalline structure. Glass can have the same chemical composition as minerals, but it is amorphous and lacks the distinctive repeating patterns of a crystalline structure.

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answer is B value of approximation

solving

The heat of vaporization for water is 40.7 kJ/mol, which means that it takes 40.7 kJ of energy to convert 1 mole of water from a liquid to a gas phase.

The energy required to boil the water is given as 63.8 kJ.

We can set up a proportion using these values:

40.7 kJ/1 mol = 63.8 kJ/x mol

To solve for x (the number of moles of water), we can cross-multiply and solve the equation:

40.7 kJ * x mol = 63.8 kJ * 1 mol

x mol = (63.8 kJ * 1 mol) / 40.7 kJ

x mol ≈ 1.57 mol

Since we know the molar mass of water is approximately 18.015 g/mol, we can convert moles to grams:

1.57 mol * 18.015 g/mol ≈ 28.29 g

Therefore, the mass of the sample of water is approximately 28.29 grams.

Answer:

1. 104000m

2. 160mm

3. 5600000 mg

Answer: Quadrant 1: (1/3, 2 1/3)

Quadrant 2: (-1 1/3, 3 1/3)

Quadrant 3: (-3, -10), (-3 1/3, -1 1/3)

Quadrant 4: (9, -1), (1 1/3, -1 1/3)

Explanation:

Graph these coordinates on an XY plane to visualize which quadrant they land in.

Answer:

addition

Explanation:

because you add the two chlorides by breaking the carbon carbon double bond

Answer:

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Explanation:

Orbitals:

Types:

There are 4 types of main orbitals.

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Answer: Option (A) is the correct answer.

Explanation:

An atom who has seven valence electrons in its ground state will have the following electronic configuration in its sub shells as 2, 7.

Thus, there will be in total 9 electrons and it is known that fluorine has atomic number 9.

Whereas sodium has 2, 8, 1 electrons in its sub-shell.

Calcium has 2, 8, 8, 2 electrons in its sub-shell and oxygen has 2, 6 electrons in its sub-shell.

Thus, we can conclude that out of the given options, fluorine is the element whose atom in the ground state has seven valence electrons.

The self-diffusivity (D) of copper can be calculated by using the given data and the equation c(x, t) = (x²/4Dt) * (√(R/D) - 1).

The equation c(x, t) = (x²/4Dt) * (√(R/D) - 1) relates the concentration of the radioactive isotope of copper (c) at a distance (x) from the end of the bar to the self-diffusivity (D) of copper and the annealing time (t).

I₁ = It counts/(min m²)

= 500 counts/(min m²)

I₂ = 500 counts/(min m²)

x₁ = mm

x₂ = 400 mm

t = 10 hours

= 600 minutes

We can use the given equation with the measured counts (I₁ and I₂) to calculate the ratio R/D.

R/D = (I₂/I₁)²

Substituting the values:

R/D = (500/500)²

= 1

We may now rearrange the equation to find D:

D = (x²/4ct) * (√(R/D) - 1)

Substituting the known values:

D = (x₁²/4ct) * (√(1/D) - 1)

= (x₁²/4ct) * (√(1/D) - 1)

Substituting the given values:

x₁ = mm

= 0.001 m

t = 10 hours

= 600 minutes

D = (0.001²/4 * 0.001 * 600) * (√(1/D) - 1)

= 1.6667 * (√(1/D) - 1)

To determine the value of D, we can numerically solve this equation. By substituting different values for D and iterating until the equation is satisfied, we can determine the self-diffusivity of copper.

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The energy needed to decompose 10.8 grams of N₂O5 is 110 kJ.

It takes 110 kJ of energy to decompose 2 moles of N₂O5 (the molecular weight of N₂O5 is 108 g/mol). Since 10.8 grams of N₂O5 is equal to 0.1 moles, it takes 110 kJ of energy to decompose 0.1 moles of N₂O5, which is the same as decomposing 10.8 grams of N₂O5.

Answer:

44.8 g

Explanation:

Density = mass / Volume

Mass = density x Volume = 8.96x 5 = 44.8 g

Answer:

2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

Explanation:

Answer: 2Ga(OH)3 + 3Hg2Cl2 → 6Hg(OH) + 2GaCl3

reaction type: Double Displacement

1. The independent variable in this experiment is the concentration of salt solutions that the sunflower plants receive.

2. The dependent variable in this experiment is the height of the sunflower plants after the two-week period.

3. The control variable in this experiment is the plant that receives pure water, which serves as a control group for comparison to the plants that receive salt solutions.

Other control variables may include the type of sunflower plant, the amount of water each plant receives, the amount of sunlight, the temperature, etc. These control variables are kept constant to ensure that any observed differences in plant height can be attributed to the concentration of salt solutions and not to other factors.

The conclusion of the answer is that in an experiment where three sunflower plants are watered with salt water of varying concentrations and a fourth plant is watered with pure water, the independent variable is the concentration of salt solutions, the dependent variable is the height of the sunflower plants after two weeks, and the control variable is the plant that receives pure water.

Control variables are kept constant to ensure that any observed differences in plant height can be attributed to the concentration of salt solutions and not to other factors.

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Answer

- What is an electron?

An electron a stable subatomic particle with a negative charge of electricity, it is found in all atoms and acting as the primary carrier of electricity in solids.

- How does the electrons movement creates an electric current?

Electrons flow in a certain rate, creating an electric current. So the electrons moving freely from one place to another place will conduct electric current.

The answer is d) combination of all. Crystals can have different shapes and structures depending on the arrangement of atoms in the crystal lattice. Some crystals may have a cubic structure, while others may have a rhombus or octahedral structure. Therefore, "crystal of atom" can have a combination of all these structures.

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Option D depicts the initial atoms when sodium and oxygen form an ionic compound. It shows two atoms of sodium, each having one valence electron, and one atom of oxygen, having six valence electrons.

The formation of an ionic compound between sodium and oxygen involves the transfer of electrons from sodium to oxygen, resulting in the formation of oppositely charged ions. In the initial state, sodium (Na) has one valence electron while oxygen (O) has six valence electrons. Sodium will lose one electron to become a positively charged ion (Na+), and oxygen will gain two electrons to become a negatively charged ion (O2-). Option D depicts the initial atoms when sodium and oxygen form an ionic compound. It shows two atoms of sodium, each having one valence electron, and one atom of oxygen, having six valence electrons. This arrangement represents the transfer of electrons from sodium to oxygen, resulting in the formation of Na+ and O2- ions. Options A, B, and C do not depict the correct arrangement of atoms in the initial state before the formation of the ionic compound between sodium and oxygen.

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Answer:

1. Heat from the pan transfers directly to the oil. 2. Heat from the pan transfers directly to the oil. 3. heated by the radiation in the microwave.

Explanation:

Answer:

The number of years it would take you to earn what Mike Trout will earn on his contract is 4,265

Explanation:

Mike Trout of the Los Angeles Angels has a contract worth $426,500,000

On the other side, you earn $100,000 per year.

To calculate the number of years it would take for you to earn what Mike Trout will earn from his contract, you must divide the amount Mike earned by the amount you earned during a year:

$426,500,000 ÷ $100,000 per year= 4,265

The number of years it would take you to earn what Mike Trout will earn on his contract is 4,265

The average speed in miles per hour, given the data is 13 miles per hour

Speed is the distance travelled per unit. Mathematically, it can be expressed as:

Speed = distance / time

This is the total distance travelled divided by the total time taken to cover the distance.

Average speed = total distance / total time

The following data were obtained from the question:

The average speed can be obtained as follow:

Average speed = total distance / total time

Average speed = 6.5 / 0.5

Average speed = 13 miles per hour

Thus, the average speed is 13 miles per hour

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Explanation:

e 20 neutrones

Answer:

31 neutrons

Explanation:

Potassium has 19 protons (you can tell by the atomic number)

Potassium-50 is an isotope, meaning that there are a different amount of neutrons than normal.

Protons never change so subtract 50 from 19 to get the number of neutrons.

Answer:

∆T = imK

∆T = Change in boiling point (B.P.)

i = van't Hoff factor = 2 for NaCl (Na+ and Cl2_

m = molality = 0.321 m

k = boiling point constant for water = 0.512 deg/m

∆T = (2)(0.321)(0.512) = 0.329 degrees

Since the normal B.P. for water is 100ºC, the new boiling point of this solution is 100 + 0.329 = 100.329ºC

So Our Answer is 100.329ºC

The boiling point of the 0.321 m NaCl solution has been 100.329 degrees Celsius.

The boiling point has been defined at the temperature at which the liquid started to convert to gas.

The van't Hoff factor has been a value of the number of ions formed by the dissociation of 1 formula unit of a compound.

The change in the boiling point of the sample, (\(\Delta T\)) has been given by:

\(\Delta T=imK\)

Where, the van't Hoff factor for NaCl, i =-2

The molality of the sample, m =0.321 m

The boiling point constant of water, \(K=0.512\;^\circ m^-^1\)

Substituting the values for change in temperature (\(\Delta T\)):

\(\Delta T=2\;\times\;0.321\;\times\;0.512\;^\circ C\\\Delta T=0.329\;^\circ C\)

The change in the temperature of the water on the addition of NaCl has been 0.329 degrees Celsius.

The initial temperature of the water has been 100 degrees Celsius. The new temperature (T) of the NaCl solution has been:

\(T=100\;+\;0.329\;^\circ \text C\\T=100.329\;^\circ \text C\\\)

The new boiling point of the NaCl solution has been 100.329 degrees Celsius.

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Answer:

The normal melting and boiling points are those when the pressure is 1 atmosphere. These can be found from the phase diagram by drawing a line across at 1 atmosphere pressure.

Explanation:

i hope it helped you

Answer: gasoline, water, sea water, chloroform and mercury so B

Explanation:

Answer:

Explanation:

P = 2.35g

Cl= 0.539 g

% MASS = mass of  X/ mass of a compound

 % mass of P =   2.35 / (2.35+ 0.539) =  81.34%

  % mass of Cl =  0.539 /(2.35+ 0.539) =  18.66 %

Answer:

what the person above me said

Explanation:

Therefore, there are 0.50 moles of KOH present in 250 mL of a 2.0 M solution of KOH.

How many moles of KOH are present in 250 mL of a 2.0 M solution of KOH?

To find the number of moles, we can use the formula:

Moles = Molarity x Volume

Given:
Molarity (M) = 2.0 M
Volume (V) = 250 mL

First, we need to convert the volume from milliliters to liters by dividing it by 1000:
Volume (V) = 250 mL ÷ 1000 = 0.25 L

Now we can substitute the values into the formula:

Moles = 2.0 M x 0.25 L
Moles = 0.50 moles

Therefore, there are 0.50 moles of KOH present in 250 mL of a 2.0 M solution of KOH.

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Answer:

437 g

Explanation:

as mass = density × volume