A sample taken from a layer of mica in a canyon has 2.10 grams of potassium-40. A test reveals it to be 2.6 billion years old. How much potassium-40 was in the sample originally if the half-life of potassium-40 is 1.3 billion years?

Answer: -COOH

Explanation: In general, carboxylic acids are represented by the formula RCOOH, where R is a hydrocarbon group and COOH is the fuctional group.

-

-

The functional group for a carboxylic acid is -COOH.

An organic acid containing a carboxyl group. The simplest examples are methanoic (or formic) acid and ethanoic (or acetic) acid.

Organic acids such as acetic acid all contain a functional group called a carboxyl group. The carboxyl group contains the C=O. of the carbonyl group, with the carbon atom also being bonded to a hydroxyl (−OH) group. The simplest carboxylic acid is acetic acid [tex](CH_3COOH)[/tex]

Hence, the functional group for a carboxylic acid is -COOH.

Learn more about the carboxylic acid here:

https://brainly.com/question/15522377

#SPJ2

Answer:

There are 0.1 moles of solute in 250 mL of 0.4 M solution.

Explanation:

First, recognize that the molar concentration tells you how many moles of the solute are present in one liter of solution. In a 0.4 M solution, there are 0.4 moles of solute in every liter of solution. You can determine the number of moles of solute in 250 mL of the solution using dimensional analysis.

250 ml . 1L/1000 L . 0.4mol / 1L

Units of liters and milliliters cancel, leaving you with a final answer in units of moles, at 0.1 mol.

Explanation: I THINK THAT YOUR POSITIVELY CHARGED HAIR WOULD BE ATTRACTED TO THE NEGATIVELY CHARGED BALLOON AND WOULD RISE UP TO MEET BALLOON.

HOPE THIS HELPS....

Answer:

C) Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon.

Explanation:

Your positively charged hair would be attracted to the negatively charged balloon and would rise up to meet the balloon. This answer is explained in the prompt.

Answer:

yeast

Explanation:

I believe the answer is Big Science.

A population is all the organisms of a single species in a given area

Answer:

Explanation:

A population is a group of organisms of the same type. A population is a group of members that belong to the same species.

Therefore, an organism is a part of a population.

Answer:

carbonic acid

Explanation:

Carbonic acid refers to the natural existent acid in our atmosphere which is produced when water reacts with water vapor and it makes rain naturally acid. As a result, rainwater is always acidic. On the other hand, acid rain occurs when precipitation contains a higher than normal acidity  and a pH lower than 5.0.

Answer:

Carbonic acid

Explanation:

Hello,

In this case, due to the increasing concentration of carbon dioxide in the atmosphere, when it rains, the following chemical reaction occurs between water and carbon dioxide:

[tex]CO_2+H_2O\rightarrow H_2CO_3[/tex]

Whose product is known as carbonic acid and it is the natural source of acidity in acid rain.

Regards.

Answer:2 AL + FEN2 = 2 ALN + FE

Explanation: AL might be an improperly capitalized: Al. One of your compounds is AL (A and L). Did you mean Al (aluminum)?

FEN2 might be an improperly capitalized: FeN2. ALN might be an improperly capitalized: AlN

FE might be an improperly capitalized: Fe

Base pairs.

Four + Five = Nine

The third letter in base is S.

IT ADDS UP.

In DNA, hydrogen bonds form base pairs between adenine and thymine or guanine and cytosine, which stabilize the double helix structure.

The hydrogen bonds between adenine (A) and thymine (T) or guanine (G) and cytosine (C) form base pairs that join the two strands of the DNA double helix. In DNA, adenine forms a base pair with thymine and guanine forms a base pair with cytosine. These base pairs are fundamental in the structure of the DNA double helix. The arrangement was suggested by Chargaff's Rules and is consistent with Watson and Crick's proposed model of DNA. Two hydrogen bonds form in an A-T base pair and three in a G-C base pair, maintaining the stability of the DNA structure.

https://brainly.com/question/31452456

#SPJ11

Answer:

Explanation:

C

Answer: 141,95 g

The answer is -B

if temperature and pressure are constant, the number of particles is proportional to the volume. Another way to keep the pressure constant as the volume increases is to raise the average force that each particle exerts on the surface. This happens when the temperature is increased.

Answer:

B, The volume will decrease.

Explanation:

Answer:

the oxidized substance will have electrons as products (i think)

Explanation:

The first step to balance any redox reaction is to separate the reaction into half-reactions. The substance being reduced will have electrons as reactants, and the oxidized substance will have electrons as products. (Usually all reactions are written as reduction reactions in half-reaction tables.

Half-reactions are used to form the overall redox reaction by first balancing them separately and then adding them together. This process, also known as the half-reaction method, provides a systematic way to balance and understand complex redox reactions.

Half-reactions are combined to form the overall redox reaction by balancing them separately first, and then adding them together. The half-reaction method involves balancing the oxidation and reduction half-reactions separately and then combining them. The overall redox reaction is obtained through this process.

Let's take a simplified example:
Imagine a redox reaction with Fe²+ and Cr₂O7²-. The two half-reactions occurring here would be the oxidation of Fe²+ to Fe³+ (oxidation half-reaction), and the reduction of Cr₂O7²- to Cr³+ (reduction half-reaction).

These half-reactions are balanced separately, where we match the electron loss in the oxidation half-reaction with the electron gain in the reduction half-reaction. The balanced half-reactions are then added together to give the overall redox equation.

To summarize, the half-reaction method is a systematic approach that allows us to simplify and understand complex redox reactions by breaking them down into manageable pieces.

https://brainly.com/question/20689685

#SPJ3

A quality I would say of a physical substance is hardness

Hardness

it's something you can see and tell without changing the composition of matter

In the electron sea model, metallic bonding is characterized by delocalized electrons freely moving around the metal ions, serving as a 'glue' that holds the atoms together. This model is known as the simplest metal bonding model.

The electron sea model is a representation of metallic bonding where valence electrons are free to move around, and hence are considered 'delocalized'. This forms a 'sea' of electrons that surrounds the positive metal ions. This model is the simplest metal bonding model, not the most complicated one. It is not characterized by the transfer or sharing of valence electrons (as with ionic or covalent bonding, respectively), but on the free movement of the electrons among a lattice of atomic cores. The delocalized electrons do serve as a kind of 'glue' that holds the metal atoms together, providing the electrical conductivity and malleability characteristic of metals. However, it's incorrect to say these electrons are attracted to specific nuclei - they are collectively interacting with many nuclei.

https://brainly.com/question/14638762

#SPJ6

The electron sea model describes metallic bonding as a delocalization of valence electrons among metal ions, without specifying attachment to individual atoms. It is the simplest metal bonding model, where the 'sea' of delocalized electrons acts as the glue holding the metal structure together.

The electron sea model is a framework used to describe metallic bonding, where the key characteristics involve the delocalization of valence electrons among metal ions. According to this model, metallic bonding results not from the transfer of electrons, as in ionic bonding, nor solely from the sharing of electrons, as in covalent bonding, but rather from a pooling of electrons resulting in a sea of electrons that are delocalized and free to move around. These delocalized electrons are not attached to any specific atom but are instead shared among many atoms, providing the characteristic malleability and conductivity of metals.

Regarding the options provided, the descriptions that are accurate for the electron sea model are:

The statements that electrons are attracted to specific nuclei and that they serve as the glue to keep metal atoms together do not represent the electron sea model adequately, as the electrons are not tied to any particular metal ion.

https://brainly.com/question/14638762

#SPJ3

Answer:

Ok so its not dust particles i have proof i choose it and it was wrong but i have been working and the answer is sun rays i looked at  images online and i found the same image so its sun rays i hope this helps.

In this illustration, the rings around the Sun represent sun rays. Sunlight, or radiation from the Sun, is a bundle of electromagnetic waves that range from infrared (IR) to ultraviolet rays (UV)

Crepuscular rays are produced when sunlight passes through gaps in clouds and continues into an environment that contains dust and/or haze. They are also known as sun rays and sunbeams.

Sunlight, specifically infrared, visible, and ultraviolet light, is a type of electromagnetic radiation emitted by the Sun.

On Earth, sunlight is reflected and filtered by the atmosphere, and when the Sun is above the horizon, it is seen as daytime.

Sunlight, or radiation from the Sun, is a bundle of electromagnetic waves that range from infrared (IR) to ultraviolet rays (UV). The electromagnetic spectrum naturally includes visible light, which lies between IR and UV.

To learn more about sun rays, refer to the below link:

https://brainly.com/question/335235

# SPJ2

Answer:

Dependent variable

Hope this helps :)

Have a great day !

5INGH

Brainliest please

Explanation:

Answer:

5746.0 mL.

Explanation:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and P are constant, and have two different values of V and T:

V₁T₂ = V₂T₁

V₁ = 6193.0 mL, T₁ = 62.3°C + 273 = 335.3 K.

V₂ = ??? mL, T₂ = 38.1°C + 273 = 311.1 K.

∴ V₂ = V₁T₂/T₁ = (6193.0 mL)(311.1 K)/(335.3 K) = 5746.0 mL.

Body systems associated with gases(particularly that which was asked):

• Respiratory System.

• Cardiovascular System or Circulatory System or Vascular System.

Note: All these three are the names of the same thing i.e cardiovascular system, circulatory system and vascular system.

Answer:20 kg * 2.2 lb/kg * 50 mg/lb * 1mL/100mg = 22 mL

Explanation:

Answer:

The correct answer is option (D) 22mL

Explanation:

Solution:

Given:

liquid concentration = 100mg/mL

weight = 20kg

dosage = 50mg/lb

converting the dosage from mg/lb to mg/kg, we have

1kg = 2.2046lb

therefore, dosage = 50mg * 2.2046/kg = 110.23mg/kg

The required solution can be obtained using the formula below

Dose = weight in kg * dosage in mg/kg ---------------1

liquid dose = dose/liquid concentration----------------2

Substituting into equation 1, we have

Dose = 20kg * 110.23mg/kg =  2204.6mg

For liquid dose, substitute into equation 2

Liquid dose = 2204.6mg/100mg/mL

                                       22. 046mL

Approximately 22mL

Therefore, 22mL is needed to be administered to the 20kg patient

Yes, radioactive decay releases energy

it is a double replacement

Answer:

Double Replacement

Explanation:

Answer:

B) The farther away from the Sun, the thinner a planet's atmosphere. Closer planets need more protection from the heat.

Explanation:

The planets closest to the Sun are the inner, or terrestrial, planets and are similar to Earth in some ways. They are rocky and dense, have few moons, no rings, and are relatively small. These planets also differ in many ways, as shown in the chart. For example, Venus is the hottest planet on the chart, even though Mercury is closer to the Sun. The temperature difference between Venus and Earth is significantly greater than the difference between Venus and Mercury, even though Venus lies close to midway between those two planets.

Answer:

[tex]\Huge \boxed{\mathrm{A}}[/tex]

Explanation:

The terrestrial planets are the planets closest to the Sun.

Venus is the hottest planet, the temperature on Venus is higher than the temperature on Mercury and Earth.

Venus has a thick dense atmosphere, composed of primarily carbon dioxide and clouds of sulfuric acid, that traps the Sun’s heat, resulting in high temperatures. The atmosphere of Venus is more denser than the atmosphere of Mercury and Earth.

The decay of a carbon-11 atom decreases the number of protons and increases the number of neutrons and causes it to emit radiations.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

When an atom undergoes decay, the number of protons present in the nucleus are decreased and radiations are emitted.

Learn more about atom,here:

https://brainly.com/question/1566330

#SPJ4

The decay of a carbon-11 atom undergoes beta-plus decay (β+ decay)and this causes it to emit emits a positron (β+) and a neutrino (v).

Step 1: Unstable Nucleus

A carbon-11 atom has an unstable nucleus because it contains an excess of protons compared to neutrons. This instability makes it prone to radioactive decay.

Step 2: Positron Emission

During positron emission, a process that stabilizes the nucleus, the following occurs:

Answer:

They are both involved in gas exchanges.

Explanation:

This is the answer because:

1) Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. Inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

2) Also, capillaries are located inside the lungs. Therefore, whenever we breathe in air we exchange gasses.

Hope this helps! :D

One similarity between the lungs and capillaries is that they are both involved in gas exchanges.

Capillaries may be defined as a network of blood vessels that supplies blood as well as oxygen throughout the body.

Both the lungs and the capillaries are actively involved in the exchange of gases in and out of the body. The capillaries are connected to the walls of the alveoli where oxygen and carbon dioxide diffuse. Carbon dioxide is exhaled outside by the lungs, while the oxygen is attached to the RBCs and travels to the heart.

Therefore, one similarity between the lungs and capillaries is that they are both involved in gas exchanges.

To learn more about Gaseous exchanges, refer :

brainly.com/question/8606959

#SPJ2

Answer: option D

Explanation:

Since optical isomers are of 2 types called Enantiomers and Diastereomers

Enantiomers are non super impossible mirror images to each other. Examples, a man's right and left hand, Gloves

Diastereomers are non super impossible non mirror images

Answer: A

When Boron-10 is struck by neutrons, it produces Lithium-7 and an alpha particle.

This is done to control the number of neutrons available to interact with Boron to control the overall reaction rate

Answer:

Option A                          

Explanation:

The reaction:

¹⁰B + ¹n  →  ⁷Li + ⁴He

Correspond to a boron neutron capture therapy, which is used for treating malignant tumors and extracutaneous melanomas.

In the reaction, the boron-10 captures the neutrons and undergoes nuclear fission to produce nuclei lithium-7 and alpha particles (nuclei ⁴He) than can kill the tumor cells.        

Hence, the correct answer is option A) when boron-10 is struck by neutrons, it produces lithium-7 and an alpha particle.

I hope it helps you!    

yup it's correct because we multiply cm by cm twice

Yes, "cm²" does indeed represent square centimeters, and it indicates an area measurement in the metric system.

The "cm" stands for centimeters, which is a unit of length, and the "²" denotes the square, signifying the second power or exponent of the unit. In mathematical terms, when you square a unit of length (in this case, centimeters), you are calculating the area.

For example, if you have a square with sides each measuring 5 centimeters, the area would be expressed as:

5 cm [tex]\times[/tex] 5 cm = [tex]5^2 \, \text{cm}^2\)[/tex] =  25 [tex]cm^2[/tex]

This concept extends to any shape or object where you need to measure the surface or coverage in two dimensions. The square unit (²) implies the measurement is being squared, representing an area rather than a linear measurement.

Answer:

Gas particles have a small volume relative to the spaces between them.

Explanation:

The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.

The energy formed by the motion of particles is called kinetic energy.

According to the question, the postulates are as follows:-

For more information about kinetic energy, refer to the link:-

https://brainly.in/question/3403229

a compass works with magnetic field the answer is d