CAN SOMEONE PLEASE HELP ME WITH MY CHEMISTRY ASSIGNMENT.

Answer:

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.

Explanation:

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Answer:

The modern periodic table has a lot to say about the chemical elements, besides the atomic number, atomic weight, and symbol of the identified elements. For example, chemical elements falling in the same group share common properties, which are different from other groups. Also, go through the periodic table trends and you will come to know a regular pattern in the alteration of physical and chemical properties of elements, as you go from left to right, from top to down direction, and vice versa.

Explanation:

I hope this gives an idea to your question - Good luck ^w

Answer: The concept behind hydroelectric power is simple: Rather than combusting fossil fuels, like coal, oil, or natural gas, which put over 52 million kilotons of greenhouse gases into the atmosphere each year, dams block the water flowing in rivers or lakes and use the force of the would-be flow to turn turbines,

Explanation:

Explanation:

From the question , arranging the organization levels from largest to smallest we have

Hope this helps you

Answer:

Organism , organ system , organ , tissue , cell

Explanation:

I took the test but it was backwards hope that helps!

Answer:

PH₂ = 0.2 atm

C) About 0.20atm, because H2 comprises 20% of the total number of moles of gas.

Explanation:

To determine the partial pressure of hydrogen gas (H2) in the mixture,

Partial pressure H₂ = Ptotal * xH₂

xH₂ = Mole fraction of H₂ = ∩H₂ / ( ∩H₂ + ∩O₂ + ∩N₂)

xH₂ = 0.01 / (0.01 + 0.015 + 0.025)

xH₂ = 0.01/0.05

xH₂ = 0.2

therefore

PH₂ = pT * xH₂

PH₂ = 1.0 atm * 0.2

PH₂ = 0.2 atm

so the correct option is C)  About 0.20atm, because H2 comprises 20% of the total number of moles of gas.

The correct answer to the question is Option C. About 0.20 atm, because H₂ comprises 20% of the total number of moles of gas.

We'll begin by calculating the mole fraction of Hydrogen (H₂) in the mixture.

Mole of Hydrogen (H₂)  = 0.01 mole

Mole of Oxygen (O₂)  = 0.015 mole

Mole of Nitrogen (N₂)  = 0.025 mole

Total mole = 0.01 + 0.015 + 0.025 = 0.05 mole

Mole fraction = mole of gas / total mole

Mole fraction of Hydrogen (H₂) = 0.01 / 0.05

NOTE: The mole fraction of Hydrogen, H₂ (i.e 0.2) in the mixture is exactly 20%.

Finally, we shall determine the partial pressure of Hydrogen, H₂. This can be obtained as follow:

Mole fraction of Hydrogen (H₂) = 0.2

Total pressure = 1 atm

Partial pressure = mole fraction × total pressure

Partial pressure of Hydrogen (H₂) = 0.2 × 1

From the calculations made above, we can see that the correct answer to the question is:

Option C. About 0.20 atm, because H₂ comprises 20% of the total number of moles of gas.

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Answer:

56,9

Explanation:

According to molar concentration, 6.113 grams of  sodium chloride are there in 55.0 ml of a 1.90 M aqueous solution of sodium chloride.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in first formula mentioned gives, mass= 1.90×58.5×0.055=6.113 g.

Thus,6.113 grams of  sodium chloride are there in 55.0 ml of a 1.90 M aqueous solution of sodium chloride.

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Explanation:

Which of the following is not a postulate of the kinetic molecular theory?

Answer is

option D. the collisions between gas molecules are elastic

Hope it will help you

Answer:2. C Hydrochloric acid

Explanation:

Answer:

the answer to #2 ic C. hydrochloric acid.

Explanation:

Answer:

24.088 * 10^23 atoms

Explanation:

The number of atoms in 4 moles of any atom is a constant since 1 mole has 6.022 * 10^23 atoms which is not affected by any property of any atom

So, 4 moles of Na will have 4 * 6.022 * 10*23 atoms

24.088 *10^23 atoms are present in 4 moles of any element

Answer:

The volume of the pycnometer is determined by using distilled water at 20°C with a known density of 0.99820 g/mL.

the density is to be calculated by

density=mass/volume

Explanation:

To determine the volume of the pycnometer, it is pertinent that we list out the parameters given for the mass and obtain the difference between them.

From the information given:

The mass difference = (36.842 - 27.314)  g

= 9.528 g

Now,

Using the relation for density, mass, and volume:

[tex]\mathbf{density = \dfrac{mass}{volume}}[/tex]

Making the volume the subject of formula:

[tex]\mathbf{volume = \dfrac{mass}{density}}[/tex]

[tex]\mathbf{volume = \dfrac{9.528 \ g}{0.99704 \ g/mL}}[/tex]

[tex]\mathbf{volume = 9.5568 \ mL}[/tex]

Here, the volume of the pycnometer is equivalent and used as the same volume of the chloroform.

From the given information, the mass difference of the chloroform is:

= (41.428 - 27.314) g

= 14.114 g

Using the equation for density:

[tex]\mathbf{density = \dfrac{mass}{volume}}[/tex]

[tex]\mathbf{density = \dfrac{14.114 \ g}{9.556 \ mL}}[/tex]

∴

The density of the chloroform is = 1.477 g/mL

Therefore, we can conclude that the volume of the pycnometer is 9.5568 g and the density of the chloroform is 1.477 g/mL

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Answer:

Californium and Berkelium

Explanation:

Both are in California.

These elements are 98 and 97 on the Periodic Table of Elements, respectively.

Answer:

1- charge

Explanation:

Answer:b

Explanation: took the test

Prism separate white light, such as that from the Sun according to their wavelength.

Prism is an optical object which have three flat polished surfaces and a triangular shape, from which refraction of light takes place.

When the sunlight or any vissible light falls on the surface of prism then the refraction of light takes place and due to refraction bending of light at different angles according to their wavelength takes place. As we know that vissible light consist all colors, so the separation of white light into the colors takes place through prism.

Hence white light gets separated through prism.

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Answer:

6.32 × 10⁻³

3.2560008× 10⁷

5.630× 10⁰

9.5002× 10¹

Explanation:

Scientific notation is the way to express the large value in short form.

The number in scientific notation have two parts.

The digits (decimal point will place after first digit)

× 10 ( the power which put the decimal point where it should be)

For example:

0.00632

In scientific notation =  6.32 × 10⁻³

32,560,008

In scientific notation  = 3.2560008× 10⁷

5.630

In scientific notation  = 5.630× 10⁰

95.002

In scientific notation  = 9.5002× 10¹

Answer:

1. 10⁻³

2. 10⁷

3. 10⁰

4. 10¹

Scientific notation is where you make a large number into a smaller form.

The numbers and exponents are the answers. Here are the parts:

10 = the base

⁻³ = the exponent/power

Hope this helps!

Answer:

if you are talking about miles the answer would be is 0.0001509932(divided by 160934)

if you are talking about mililiters it would be 24.3(multiply times one)

hope this helps

Answer:

true

Explanation:

Answer:

They give water to the agricultural industry.

They consume a large amount of energy.

They aid with habitat protection.

The environmental impact can be high.

They distribute accessible drinking water.

An atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

Atom are defined as smallest unit into which matter can be divided without the release of electrically charged particles.

It can also be defined as the building blocks of matter and were created after big bang theory.

Mass are defined as quantitative measure of inertia, fundamental property of all matter.

Elements are defined as a pure substance consisting of only one type of atom which all has the same numbers of protons in their nuclei.

As ratio of element A to element B is given then the ratio will be 3:1

Thus, an atom of element A has a mass of 2 units, while an atom of element B has a mass of 5 units, the ratio of element A to element B in a compound that had a mass of 11 units is 3:1

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The ph value of human saliva is between 6.2-7.6 with 6.7 being the average pH

ph value of human saliva is 7 and 6

Answer:

…mixture of two stable isotopes—boron-10 (19.9 percent) and boron-11 (80.1 percent); slight variations in this proportion produce a range of ±0.003 in the atomic weight.

Explanation:

When 325 g of CHCl3 is produced, approximately 99.29 grams of HCl are produced.

To determine the amount of HCl produced when 325 g of CHCl3 (chloroform) is produced, we need to use the balanced chemical equation for the reaction:

CHCl3 + 2NaOH -> NaCl + H2O + CCl4

From the balanced equation, we can see that the stoichiometric ratio between CHCl3 and HCl is 1:1. This means that for every 1 mole of CHCl3, 1 mole of HCl is produced.

To calculate the number of moles of CHCl3, we need to divide the given mass (325 g) by its molar mass:

Molar mass of CHCl3 = 12.01 g/mol (C) + 1.01 g/mol (H) + 3 x 35.45 g/mol (Cl) = 119.38 g/mol

Moles of CHCl3 = 325 g / 119.38 g/mol = 2.72 mol

Since the stoichiometric ratio between CHCl3 and HCl is 1:1, the number of moles of HCl produced is also 2.72 mol.

To calculate the mass of HCl, we multiply the number of moles by its molar mass:

Molar mass of HCl = 1.01 g/mol (H) + 35.45 g/mol (Cl) = 36.46 g/mol

Mass of HCl = 2.72 mol x 36.46 g/mol = 99.29 g

This calculation is based on the stoichiometric ratio between CHCl3 and HCl, where 1 mole of CHCl3 produces 1 mole of HCl. By converting the given mass of CHCl3 to moles and then multiplying by the molar mass of HCl, we can determine the mass of HCl produced.

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Answer:

1. chlorine ion 2. methylene

Explanation:

I think #2 is right. i'm not sure.

Answer:

35.8 grams

Explanation:

Multiply the density of ethyl alcohol by the volume because this will cause the units of mL to cancel out leaving you with the grams, or mass.

1.79 x 20 = 35.8

Combining "hydro" and "genes" in the context of the Latin roots, we can interpret it as "water origin" or "water-related origin."

The term "hydro" in Latin means "water." It is derived from the Greek word "hydor," which also signifies water. "Hydro" is commonly used as a prefix in scientific terms related to water or hydrogen. In the context of chemistry, "hydro" often denotes a compound or process involving water or hydrogen atoms. For example, hydrocarbon refers to organic compounds composed solely of hydrogen and carbon atoms.

On the other hand, "genes" in Latin is derived from the Greek word "genos," which translates to "origin" or "birth." In biology, the term "genes" refers to the segments of DNA that contain instructions for the development and functioning of living organisms. Genes determine various traits, such as physical characteristics, behavior, and susceptibility to certain diseases. They play a fundamental role in the transmission of hereditary information from one generation to another.

This interpretation aligns with the understanding that hydrogen, which is essential for life and abundant in water, plays a vital role in various biological and chemical processes.

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Answer:

Density of copper = 8.9 g/cm³

The density of liquid mercury is 13.6 g/cm³ which means mercury is denser than copper so copper will float on liquid mercury.

Explanation:

Given data:

weight of copper metal = 1896 g

Dimensions of block = 8.4 cm, 5.5 cm, 4.6 cm

Density of copper = ?

Will it float to the liquid mercury = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

volume of coper metal =  8.4 cm × 5.5 cm × 4.6 cm

volume of coper metal =212.52 cm³

d = 1896 g/ 212.52 cm³

d = 8.9 g/cm³

The density of liquid mercury is 13.6 g/cm³ which means mercury is denser than copper so copper will float on liquid mercury.

Answer:

Use appropriate cut-resistant gloves to handle broken glass. Use forceps, tongs, scoops, or other mechanical devices for removing or retrieving broken glass from the work area or a fume hood. A dustpan and brush should be used to clean up shards/small pieces of broken glass, Pasteur pipettes, or shards of glass.

Explanation:

Answer:

Step away from the mess and have a teacher/gaurdian access the situation.

Answer:

51.14%

Explanation:

The following data were obtained from the question:

Mass of hydrated salt = 7.212 g

Mass of anhydrous salt = 3.524 g

Percentage mass of water =..?

Next, we shall determine the mass of the water in the hydrated salt. This can be obtained as follow:

Mass of hydrated salt = 7.212 g

Mass of anhydrous salt = 3.524 g

Mass of water =.?

Mass of water = (Mass of hydrated salt) – (Mass of anhydrous salt)

Mass of water = 7.212 – 3.524

Mass of water = 3.688 g

Finally, we shall determine the percentage mass of water in the hydrated salt as follow:

Percentage of water

= mass of water /mass of hydrated salt × 100

Percentage of water = 3.688/7.212 × 100

Percentage of water = 368.8/7.212

Percentage of water = 51.14%

Therefore, the percentage of water in the hydrated salt is 51.14%

Answer:

the one that uses radio communication is FM Radio