If you are given a 2,900-gram sample of Hydrogen, and hydrogen has a half-life of 2,450 years. How much hydrogen is left after 19,600 years?

Answer:

Explanation:

This question is a little indirect but what should be noted is that the control group of any experimental research is the group that is not subjected to any form of treatment and is the first group in which the other groups (experimental groups) are compared to.

The control group in the experiment described in the question is the group placed in the bathtub with no water

In Absorption Experiment,

Water location is the independent variable in this experiment.

Room Temperature in the material is dependent variable in this experiment.

Type of a material is a controlled variable in this experiment.

Absorption experiment is nothing but the experiment of absorption of water in a material (sponge).

Experiment requires vessel, water and sponge.

Processor - take a vessel, pour water into it and dip sponge. take out the sponge. After taking of out sponge, water appears to be decreased from the vessel and sponge gets heavier. When we squeeze the the sponge, water drops down. It is because of water is absorbed by the spouge.

There are number of pores in the sponge, which absorbs the water.

Water location is the independent variable.

In this experiment Room Temperature is dependent variable in this experiment rate of absorption increases with increase in the temperature. decrease in the temperature cause to solidify the water. Type of a material is a controlled variable, we can change type of the material.

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The heat evolved or absorbed in an open system, where reactants and products are constantly in contact with their environment and there is constant pressure, is equivalent to the change in enthalpy.

Under conditions of constant pressure, the change in enthalpy of the reacting species equals the amount of heat evolved or absorbed in a chemical reaction. This is referred to as the reaction's enthalpy change (H). A thermodynamic property called enthalpy (H) denotes a system's overall heat capacity. The difference between the enthalpy of the products and the reactants determines the change in enthalpy of a reaction. The heat evolved or absorbed in an open system, where reactants and products are constantly in contact with the environment and there is constant pressure, is equivalent to the change in enthalpy (H), because the heat is being exchanged with the environment. The name of this law is Hess's Law.

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List 1 is the best choice of materials because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

Composting is the process whereby remains of organic matter are keep in a favorable environment and conditions in order to allow for decomposition.

Compost consists of the right mix of biotic factors suchas worms and fungi as well as abioticfactors such as water and sun.

Therefore, based in the materials provided, List 1, because it has a balance between biotic decomposers and abiotic factors needed for the worms and composting.

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All of the elements in the boron group except boron are: metal.

An element is a chemical substance that is made up of only one type of atom, which is identified by its atomic number (the number of protons in its nucleus). Elements are classified into groups based on their chemical and physical characteristics. The Periodic Table of Elements is a chart that organizes the elements into columns (groups) and rows (periods) based on their electron configuration.

The elements in the boron group are boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). Boron is the only non-metal in this group. All of the other elements are metals, and they have some characteristics in common. They are all relatively soft, have low melting points, and are good conductors of heat and electricity. They are also all trivalent (having a +3 oxidation state).Aluminium (Al), Gallium (Ga), Indium (In), and Thallium (Tl) are the elements present in the boron group except boron.

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Using the expression of Clausius-Clapeyron equation we can calculate the vapor pressure. Putting all the values in the expression we get the result.

The vapor pressure can be defined as the force that an evaporating substance exerts against the walls of a sealed container. ln (P1/P2) = (ΔHvap. /R) (1/T2 - 1/T1). where, P1 and  P2 are the vapor pressures at two temperatures T and T2 . A solution made from 23.5 g of glycerin in 130 g of methanol at 50 °C. The vapor pressure of pure methanol at 50 °C is 400 torr. Clausius-Clapeyron equation allows to estimate the vapor pressure at another temperature if the vapor pressure is known at some temperature and if the enthalpy of vaporization is known. The partial vapor pressure of a component in a mixture is equal to the vapor pressure of the component at that temperature multiplied by the component's mole fraction.

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Answer:

per and cent, per means for every and cent is a value, percent would be a value of or for every value

Explanation:

In foreign nations where cholera is present, avoid consuming raw foods or water unless they are well-known to be safe or have undergone the necessary treatment (option b).

Antibiotics are drugs that treat bacterial illnesses in people and animals by either annihilating the bacteria or making it harder for them to develop and multiply. Germs are what bacteria are. They are everywhere in our bodies, both inside and outside, as well as in the surroundings.

Antibiotics frequently cause stomach pain, diarrhea, and nausea as side effects. Dehydration and other issues can sometimes result from these symptoms. Inquire of your doctor on possible antibiotic side effects and drug interactions.

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Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of silver = 0.25 cm³

density = 10.5 g/cm³

The mass is

mass = 10.5 × 0.25 = 2.625

We have the final answer as

Hope this helps you

Answer:

8.11

Explanation:

pH = -log[H+]

pH = -log[7.8 x \(10^{-9}\)]

pH = 8.107905...

pH = 8.11

In the event that a thermometer breaks, the most important action to take is to pick up the broken glass and dispose of it properly.

You should also clean the area to ensure that there are no remaining pieces of glass. Additionally, it is important to tell the teacher about the accident right away and not try to save the red alcohol or pay for a replacement thermometer, as this is not necessary.

Calling 911 is not necessary, unless someone is injured by the broken thermometer. When cleaning up a mercury spill, it is important to use caution and protective gear, such as gloves, goggles, and a face mask, to reduce the risk of exposure to mercury vapors. You should also make sure to keep any children and pets away from the spill area.

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Answer:

KCI

Explanation:

I took the test

The reason KCl or potassium chloride, an electrovalent chemical, conducts electricity when it is liquid or molten is because the electrostatic forces of attraction are weaker in the fused form or in aqueous solution.

For a substance to conduct electricity, charged particles like electrons and ions must be allowed to move around freely within it. Like many other ionic compounds, potassium chloride possesses fixed ions in its solid state that prevent it from moving or conducting electricity. For example; Hydrogen chloride is a polar covalent molecule that can ionize in solution and serve as an electrolyte.

An great electrical conductor is potassium. Its atomic radius is bigger because it contains four shells with just one electron in the outermost shell. It is a powerful conductor of electricity because it has a lower ionization energy and a higher number of free electrons. Mineral deposits and igneous rocks are the sources of potassium.

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Answer:

A. cycas

1. it is thick and scaly

2. it grow relatively slowly and have a large, terminal rosette of leaves.

B. bamboo

1. it is very durable

2. it is both flexible and elastic

C. lemna

1. it grows as simple free-floating thalli on or just beneath the water surface

2. it are small, not exceeding 5 mm in length

D. paddy

1. it is variety purity

2. it degree of purity

E. sugarcane

1. it is bear long sword-shaped leaves

2. it's stalks are composed of many segments, and in each joint there is a bud

There are 7 electrons on the third energy level

The maximum number of electrons that can be filled in the nth electron shell is 2n²(n=shell)

• K shell (n = 1) maximum 2 x 1² = 2 electrons  

• L shell (n = 2) maximum 2 x 2² = 8 electrons  

• M shell (n = 3) maximum 2 x 3² = 18 electrons  

• N shell (n = 4) maximum 2 x 4² = 32 electrons  

Electron configuration of Si : 1s²2s²2p⁶3s²3p⁵ = 17 electron

The electron distribution :

K shell(n=1) ⇒the first energy level= 2  

L shell(n=2) ⇒the second energy level= 8

M shell(n=3)⇒the third energy level = 7

Explanation:

answer is you're question

comman factors that can lead to high blood pressure include.

Answer:

The volume of the gas at 100°C is 4.6189 liters.

Explanation:

For this problem we are going to use Charles' law. Charles' law states that the volume is directly proportional to temperature given that the pressure is constant. In order to use the equation, the unit of temperature should be in Kelvin.

The working equation is:

=

where V1 and T1 are the initial volume and temperature while V2 and T2 are the final conditions.

Let us convert first the temperatures before solving for the final volume.

To convert Celsius to Kelvin just add 273.15 to temperature in Celsius.

50°C + 273.15 = 323.15 K

100°C + 273.15 = 373.15 K

Solving for the final volume:

V₂ =

V₂ =

V₂ = 4.6189 L

Therefore the final volume of the gas at 100°C is 4.6189 L.

Explanation:

The anhydrous magnesium sulfate required to dry a di-ethyl ether solution after performing extractions involving water is enough such that some powder remains free flowing in solution with swirling without clumping.

Extraction is a process which involves transfer of a solute from one phase to another. A cup of tea or coffee prepared represents a process of extraction.The flavor and odor components are extracted from the dried material into the water.

Anhydrous magnesium sulphate works as a drying agent. Magnesium sulfate (MgSO₄) works by forming complex with H₂O in the solvent. It forms a hydrated MgSO₄ precipitate. This precipitate is then filtered out by gravity, which yields an anhydrous product. Due to the high affinity towards water molecules, MgSO₄ removes any amount of water from the extracts.

Due to the presence of an active hydrogen atom, ethyl alcohol reacts with magnesium metal. Diethyl ether, does not have any replaceable hydrogen atom. So, it does not react with magnesium sulfate, therefore, can be dried by anhydrous magnesium sulfate.

Complete question is -

How much anhydrous magnesium sulfate is required to dry a diethyl ether solution after preforming extractions involving water?

Select answer and submit.

a. Enough to cover the tip of your scoopula once

b. 1 g/mL of diethyl ether

c. Enough such that some powder remains free flowing in solution with        

   swirling without clumping

d. Anhydrous magnesium sulfate doesn't dry diethyl ether

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Temperature in degrees Celsius is considered an interval level of measurement.

In the context of temperature, interval measurement means that the differences between temperature values are meaningful and can be quantitatively compared. It allows for the calculation of temperature differences and the determination of intervals between temperature values. However, there is no inherent meaningful zero point in degrees Celsius. For example, a temperature of 0 degrees Celsius does not indicate the complete absence of heat. Therefore, ratios of temperature values, such as doubling or halving, do not hold the same significance as they would in a ratio level of measurement.

It's important to note that the choice of temperature scale, such as Celsius, Fahrenheit, or Kelvin, is a matter of convention and does not affect the level of measurement.

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The level of measurement for temperature in degrees Celsius is interval level of measurement.

What is level of measurement?

In statistics, the level of measurement describes the nature of the variable or data. In research studies, researchers make use of different data types based on their nature.

Four levels of measurement are used, which are nominal, ordinal, interval, and ratio levels.

These levels vary in terms of the characteristics of the variables measured.Nominal level of measurement refers to qualitative variables, which are categorized and identified based on their characteristics.

Ordinal level of measurement refers to variables that can be ordered, and the difference between them is not necessarily constant.

Interval level of measurement involves variables that are ordered, and the difference between them is constant.

Ratio level of measurement involves variables that are ordered, and the difference between them is both constant and meaningful.

Based on the above discussion, the level of measurement for temperature in degrees Celsius is interval level of measurement.

This is because temperature in degrees Celsius involves values that are ordered, and the difference between them is constant.

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When natural conditions are present in a free market then, the natural monopoly arises. Dstv is unique and has no other substituents that make them an example of monopoly.

Monopoly is the dominance of a single product, goods, service, business, etc. in the market or the economic sector that excludes the other competitors. They can be the single seller that sells in the business.

DStv is a monopoly in America and includes natural gases, electricity, and communication services. It has no other competitor in the market and has control over others. They are the sole service provider and have no close substitutes.

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Explanation:

solution 1) homogeneous

2) do not scatter light

3) cannot be separated by filtration

Colloids 1) heterogeneous

2) scatter light

3) cannot be separated by filtration

suspension 1) heterogeneous

2) may either scatter light or be opaque

3) can be separated by filtration

Here's a step to draw resonance structures in organic chemistry:

There must be genuine Lewis structures in every resonance structure. (Remember that all the guidelines that apply to Lewis structures still hold true here.) The only difference in resonance structures' atom connection and electron configuration. (Electrons move; atoms NEVER do.)

The electron count and net charge are identical for all resonance configurations. (An atom's formal charge may differ, but the net charge, which is the total of all charges, must be the same.)

Only electrons and lone pair electrons (NEVER move bonds!) can be transferred by employing one of the following three transformations to move electrons from a region with a greater electron density to one with a lower electron density:

To depict the motion of the electrons in the "original" resonance structure, use curved arrows. By following the arrows, the "new" resonance structure should be a "product" that is automatically created.

Determine the "new" structure's formal charge and note any non-zero formal charges.

example attached below

Only the electrons can move around in this example because there is only one link and no lone pairs. The low electron density region, or carbocation, is present next to the bond. As a result, it makes sense to transfer the electrons to the position next to the carbocation to create another bond, which results in the "new" structure. Here, the two resonance structures are identical.

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Answer:

Elements?

Explanation:

Im not sure but I think its elements because carbon dioxide is, and the others sound like it too

Answer:

36.02g bbbbbbbbbbb hbbnjkkkj

Answer:

36.02g

Explanation:

Hope this helps!

Chemical equation: 3H₂ + N₂ → 2NH₃  Now we will compare the moles of ammonia with hydrogen from balance chemical equation:  H₂ :  NH₃  , 3  : 2 2   :  2/3×2 = 1.3 mol , Percent yield = 60.%.

The % ratio of the theoretical yield to the actual yield is known as the percent yield.It is calculated as the theoretical yield multiplied with 100% divided by the experimental yield.The percent yield equals 100% if the theoretical and actual yields are equal.

Percent yield is calculated as follows: percent yield = actual yield / anticipated yield multiplied by 100.We're going to discuss yield in percentage.The ratio between actual yield versus theoretical yield is known as percent yield.

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Answer: The molarity is 0.25 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

\(Molarity=\frac{n\times 1000}{V_s}\)

where,

n = moles of solute

\(V_s\) = volume of solution in ml

moles of \(CO_2\) = \(\frac{\text {given mass}}{\text {Molar mass}}=\frac{11g}{44g/mol}=0.25mol\)

Now put all the given values in the formula of molality, we get

\(Molarity=\frac{0.25\times 1000}{1000ml}\)

\(Molarity=0.25M\)

Therefore, the molarity is 0.25 M

Answer:

Mountains

Explanation:

Mountains are colder than the lower elevations.  When humid air enters a cooler region, the saturated air begins to cool  and this reduces the ability of the air to maintain the evaporated water is the gas state.  Molecules of water have reduced enerfy at the cooler temperatures.  They will slow down and coalesce with other water molecules to form small droplets of water.  The atmoshere cannot hold these heaevier droplets and they begin to fall  (i.e., rain).

One migh ask why does the air temperature drop at higher altitudes?  Heat rises, so why shouldn't it be warmer on top a mountain, compared to the valley.  The reason is that the atmosphere becomes less dense the further from Earth's center on gets.  This less dense air has a lower water saturation point, so it rains.

Answer: I would usually try my BEST to get help from yt videos. I recommend using yt that give the most kindergarten type speaking technique, this is really weird to say but it helps just incase you can be stressed out about the words being given by teachers in Chemistry. And I recommend writing down the notes when they explain as well. Hope this helps!

The great ocean conveyor belt is a model that describes how ocean currents circulate thermal energy around the Earth.

Thermal energy is a type of energy that is associated with an object's or system's temperature. It is the energy that is transferred between two systems or objects as a result of a temperature difference. Thermal energy can be transferred through three methods: conduction, convection, and radiation.

Conduction is the transfer of thermal energy through a material without the material itself moving. Convection is the movement of fluids such as air or water that transfers thermal energy. The transfer of thermal energy via electromagnetic waves, such as light or infrared radiation, is known as radiation.

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