A first-order reaction has a half-life of 16.7 s . How long does it take for the concentration of the reactant in the reaction to fall to one-fourth of its initial value?

It is Scandium or Sc

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The correct density of helium should be in [tex]\( \text{kg/m}^3 \)[/tex]. The calculated mass of helium in the blimp is approximately 1,121.908 kg.

The question asks us to find the mass of the helium in a blimp. To do this, we need to use the density of helium and the volume of the blimp.

However, the density provided in the question is not correctly stated because density should be mass per volume, usually given in grams per liter [tex](\( \text{g/L} \))[/tex] or kilograms per cubic meter [tex](\( \text{kg/m}^3 \))[/tex].

Assuming that the correct density of helium is 0.1786 [tex]\( \text{kg/m}^3 \)[/tex] (as would be common for a question of this nature), and the volume of the helium is given as [tex]\( 6.28 \times 10^9 \)[/tex] milliliters, we first need to convert the volume from milliliters to cubic meters to match the units of the density [tex](since \( 1 \) mL = \( 1 \times 10^{-6} \) \( \text{m}^3 \))[/tex].

First, convert the volume:

[tex]\( \text{Volume in cubic meters (m}^3\text{)} = 6.28 \times 10^9 \) mL \( \times 1 \times 10^{-6} \) \( \text{m}^3/\text{mL} \)\\ \( = 6.28 \times 10^3 \) \( \text{m}^3 \)[/tex]

Then calculate the mass: [tex]\( \text{Mass} = \text{Density} \times \text{Volume} = 0.1786 \) \( \text{kg/m}^3 \) \( \times 6.28 \times 10^3 \) \( \text{m}^3 \)[/tex]

[tex]\( \text{Mass of helium} = 1,121.908 \) kg[/tex]

The mass of helium in the blimp is approximately 1,121.908 kilograms.

fresh air for breathing

ability to sustane life

treat peoples breathing problem

energy in automobiles

industriel procces

Explanation:

Water has a formula which represents two hydrogen atoms are attached to one oxygen atom. Therefore, the formula of water is [tex]H_{2}O[/tex].

Salt is also known as sodium chloride. Its formula represents that one sodium atom is attached to one chlorine atom, therefore, its formula is NaCl.

Carbon dioxide has a formula which represents one carbon atom is attached to two oxygen atoms. Therefore, its formula is [tex]CO_{2}[/tex].

Methane has a formula which represents one carbon atom is attached to four hydrogen atoms. Therefore, its formula is [tex]CH_{4}[/tex].

Thus, we can conclude that [tex]H_{2}O[/tex] is water, [tex]CO_{2}[/tex] is carbon dioxide, NaCl is salt, and [tex]CH_{4}[/tex] is methane.

The various compounds along with their corresponding formula would be as follows:

Water is made up of two atoms of hydrogen and an atom of oxygen bonded together as H2O.

Common salt consists of an atom each of sodium and chlorine bonded together as NaCl.

Carbon dioxide consists of an atom of carbon and two atoms of oxygen bonded together as CO2.

Methane consists of an atom of carbon and four atoms of hydrogen bonded together as CH4.

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Answer is: 1p.

First energy level only have one sublevel 1s.

Second energy level has 2s and 2p, third has 3s, 3p and 3d and fourth has 4s, 4p, 4s and 4f.

Aufbau principle is a scheme used to reproduce the electron configurations of the ground states of atoms by successively filling subshells (orbitals) with electrons in a specific order.

Filling subshells in the following order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f.

The following which is not a possible sublevel is 1p. Thus option 1 is correct.

Electronic configuration is defined as a symbolic representation of the manner in which the electrons of its atoms are distributed over different atomic nuclei.

It can also be defined as distribution of electrons around the nucleus.

The general electronic configuration is

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p.....

Sublevel is defined as a level that is lower than or subordinate to another level.

Thus, the following which is not a possible sublevel is 1p. Thus option 1 is correct.

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Answer:

Metalloids

Explanation:

You can boil or evaporate the water and the salt will be left behind as a solid. If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water. One way to separate salt and water at home is to boil the salt water in a pot with a lid. So, I would say maybe oil.

It is so strict because a foreign species could compete with a native species and drive it to extinction.

vinegar and antacids.

The density of an object, a fundamental principle in physics, is calculated by dividing its mass by its volume. In the case of the iron piece that has a mass of 63.5g and a volume of 11.6 cm3, its density is calculated to be 5.47 g/cm3.

The density of an object is calculated by dividing its mass by its volume. This concept is a fundamental principle in physics. In this case, the piece of iron has a mass of 63.5g and a volume of 11.6 cm3. Thus, the density can be calculated using the formula density = mass/volume.

So, density = 63.5g / 11.6 cm3 = 5.47 g/cm3. Therefore, the density of the given piece of iron is 5.47 g/cm3.

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The atomic number is the number of protons, so this atom has 23 protons.

That would be 2 grams.

well the mass of 0.1 mole or 0.000000000001 centi

The correct answer is option (C). Typically protons cannot be removed from the atom.

Protons, along with neutrons, are the subatomic particles that make up the nucleus of an atom. They are held together by the strong nuclear force, which is one of the four fundamental forces of nature. This force is so strong that it overcomes the electromagnetic repulsion between the positively charged protons. As a result, protons cannot be easily removed from the atom through typical chemical reactions or processes.

Electrons, on the other hand, are much less massive and are bound to the atom by the electromagnetic force, which is weaker than the strong nuclear force. Electrons can be removed or added to an atom during chemical reactions, a process that results in the formation of ions.

Neutrons are neutral particles found in the nucleus along with protons. While they are not electrically charged like protons, they still contribute to the mass of an atom and play a role in nuclear reactions. Similar to protons, neutrons are also held in the nucleus by the strong nuclear force and cannot be removed through chemical means.

Tachyons are hypothetical particles that are said to move faster than the speed of light. They are not part of the known structure of atoms and are not considered in the context of typical atomic or chemical processes.

Take the number of the exponent and move the decimal that many places.  If it is positive move it left and if it is negative move it right.

For Example:

2.57x10³= 2570

Fill in any access spaces with zero.

Taking that same number to the negative 3 power

2.57x10^-3

0.00257

I put a 0. to show it is a distinctive decimal.

Take the number of the exponent and move the decimal that many places.  If it is positive move it left and if it is negative move it right.

For Example:

2.57x10³= 2570

Fill in any access spaces with zero.

Taking that same number to the negative 3 power

2.57x10^-3

0.00257

I put a 0. to show it is a distinctive decimal.

An atom is the smallest unit of matter that retains all of the chemical properties of an element. Atoms are made up of smaller particles called subatomic particles, including protons, neutrons, and electrons. Different types of atoms correspond to the different elements on the periodic table.

Among the options you provided, option 'a' most accurately describes an atom: An atom is the smallest particle of an element. Indeed, an atom is the smallest unit of matter that retains all of the chemical properties of its corresponding element. For example, one gold atom retains all of the properties of the element gold.

Atoms themselves are composed of even smaller particles called subatomic particles, including protons, neutrons, and electrons. These subatomic particles contribute to the atom's mass and unique properties. The number of protons and neutrons gives mass to the atom while the number and arrangement of electrons determine the element's properties.

It's also important to note that while all matter is made up of atoms, not all substances are made of the same atoms as suggested by option 'd'. Each type of atom corresponds to a specific element on the periodic table, and these different types of atoms can combine in various ways to form all the diverse substances we see in our universe.

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The technical term for the study of the origins of the universe is cosmogony, although informally the term cosmology covers this as well. Answer: The universe is composed of matter and energy.

The origin of the universe, its elements, and its structure are studied in the field of astronomy which is referred to as cosmology. It also studies the evolutionary theory of the universe.

Cosmology is the astronomical branch that studies and analyzes the evolution and origin of the universe and the celestial or astronomical bodies found in them.

It is a scientific study that explores and researches the physical and chemical properties of the universe and its element based on the hypothesis and observed facts.

It even deals with the human and organismic origin and earth as the only planet that sustains life. The big bang theory is the most exemplified study in cosmology.

Therefore, cosmology is the study of the origin and structure of the universe.

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A neutral atom has equal number of protons and electrons. A +ion or cation is an atom that has lost electrons, thus having a net positive charge. A -ion or anion is an atom that has gained electrons, resulting in a net negative charge.

An atom is considered neutral when it has an equal number of protons and electrons. The protons carry a positive charge and the electrons carry an equal magnitude of negative charge, so when the numbers are equal, their charges cancel each other out, leading to a balanced, or 'neutral', overall charge.

A +ion, or cation, is an atom (or a molecule) that has lost one or more electrons. Since electrons have negative charge, the loss of electrons leads to an excess of positive charge, making the atom or molecule a positive ion.

Conversely, a -ion, or anion, is an atom (or a molecule) that has gained one or more electrons. Since electrons carry negative charge, the gaining of electrons leads to an excess of negative charge, making the atom or molecule a negative ion.

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Answer:

oxygen, hydrogen, nitrogen, phosphorus, and sulfur

Explanation:

Oxygen and hydrogen

a: is the correct anwser

Final answer:

A graduated cylinder is the correct tool for measuring the volume of liquid, with readings taken at the meniscus's lowest point. Pan balances and scales measure mass, not volume, and metric rulers are for measuring length.

Explanation:

The student asked which tool could be used to measure the volume of a liquid. The correct answer is a graduated cylinder. Graduated cylinders are precision instruments commonly used in labs to measure liquid volumes accurately. They can measure in units such as milliliters (mL) and centiliters (cL), offering flexibility for small or large amounts.

To use a graduated cylinder, you should first place it on a level surface and then pour the liquid into the cylinder. Observe the liquid level and make a reading at the bottom of the meniscus, the curve seen at the top of the liquid layer. The meniscus occurs because of the surface tension of the liquid in contact with the container. The correct volume will be where the lowest point on the meniscus aligns with the cylinder's measuring scale.

Other instruments such as a pan balance, scale, and metric ruler are not suitable for measuring liquid volumes. A pan balance and a scale are designed to measure mass, and a metric ruler is typically used for measuring lengths.

Answer:

B. Lindsay measures the sizes of the craters on the Moon.

Explanation:

Science is about making a hypothesis, doing experiments, making observations, recording data, analyzing data, interpretation of the data, and writing meaningful conclusion. Here Lindsay measures the sizes of the craters on the Moon, which falls under making observations and recording data so Lindsay is ding experiments.  

Dominick is simply using technology, Murray is simply guessing a number and Isabel’s invention falls under engineering.  

Answer:

the action of becoming destroyed and removed via air, rain, or even other natural phenomena

Explanation:

Do you relizes how many activities lead to global warming? When gas is burned in a car, it produces carbon dioxide (a green house gas). The carbon dioxide then floats up towards the atmosphere and becomes part of the atmosphere. This then causes the heat from the sun to get trapped, bouncing from the atmosphere to the earth. The sun will never stop producing heat which will only lead to the world getting hotter as each decade goes by.  

Hope this helps you!

Many every day activities lead to global warming because they produce pollution. When gas is burned in a car, it produces carbon dioxide, a Greenhouse gas. It floats up towards the atmosphere, and makes holes in the atmosphere which lets in those harmful UV radiation and sometimes also adds more atmosphere which could turn earth into the next venous. This causes the heat from the sun to get trapped, bouncing from the earth to the atmosphere. The sun doesn't stop producing heat, so the world gets hotter, causing many changes in temperature each decade that goes by.

hope that helped

Potassium Does! Hope that helps

Potassium has 19 protrons and 20 neutrons. We can easily tell this because on The Periodic Table, potassium (symbol "K") is number 19. Meaning it has 19 protons and 19 electrons.

A food web illustrates a snake eating a rat. What is the role of the snake in the food web?

A. Decomposer

B.Secondary consumer

C.Primary consumer

D.Producer

Answer:

B.Secondary consumer

Explanation:

A food web is a natural relationship in a food chain among organisms in an ecological community.

A secondary consumer in this system has to do with organisms that eat primary consumers, which means that they consume another animal or organism without producing.

Therefore, in a food web illustrates a snake eating a rat, the role of the snake in the food web is secondary consumer.

The maximum number of dots an electron dot diagram can have is EIGHT.

The maximum number of dots drawn on a side of a chemical symbol in an electron dot diagram is TWO.

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The maximum number of dots an electron dot diagram can have is (D:Eight). The maximum number of dots drawn on a side of a chemical symbol in an electron dot diagram is (A:two)

By convention,

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Accuracy

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Accuracy is a measure of how close a measurement is to its true value, and it is influenced by systematic errors. It differs from precision, which is about the consistency of repeated measurements. An accurate measurement aligns closely with the accepted true value.

Accuracy is a measure of how close a measurement is to its true value. In science, accuracy is crucial because it indicates the degree to which a measured value aligns with the accepted true value of that quantity.

They would be apart of the Eukarya kingdom

Answer:

Comprehensive Science FLVS right, I took the end module exam to. It is Eukarya

Explanation:

When methane is burned with oxygen, the products are carbon dioxide and water. If you produce 18 grams of water from 8 grams of methane and 32 grams of oxygen, how many grams of carbon dioxide were produced in the reaction?

Solution:

32 - 18 = 14

14 + 8 = 22

Answer:

22