A sheet of aluminium foil is held in front of a radioactive source. Two types of radiation are detected on the other side. What type of radiation will not be detected?.

Answer:

comes from a translation of the German word Edelgas, which means noble gas.

Why Are Noble Gases Called Noble? The term “noble gas” comes from a translation of the German word Edelgas, which means noble gas. German chemist Hugo Erdmann coined the phrase in 1898. Like a nobleman might consider it undignified to associate with commoners, noble gases tend not to react with other elements.

Explanation:

hope it helps

Answer:

See explanation

Explanation:

There are different kinds of analytical balances that read the mass of objects weighed in them to one, two, three or four decimal places as the case may be.

Most common analytical balances read the mass of objects to two or three decimal places hence the last 1 after the decimal point are likely to be approximated.

Hence, the scale may read 16.12 as the case may be.

Answer:

This is because the material of which the football is made up of expands during the day due to hot summer where the particles of it try to move away from each other whereas at night due t less temperature the contract therefore the football feels softer as before

Answer:+5

Explanation:

The oxidation number of the phosphorus (P) in phosphate (PO₄³⁻) is +5.

This is because oxygen (O) has an oxidation number of -2 and there are four oxygen atoms in the phosphate ion, giving a total charge of -8. Since the overall charge of the ion is -3, this means that the oxidation state of phosphorus must be +5 to account for the total charge of the ion.

Answer:

10.2 times 7.0 times 15.1 times 32.9 times

Explanation:

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

Learn more about chemical equations,here:

https://brainly.com/question/19626681

#SPJ1

The temperature of the gas after it has been stretched out to 7.50 L is 11.7 C.

This can be determined using the combined gas law equation, which states that P1V1/T1 = P2V2/T2. Since the pressure of the gas is constant, we can simplify the equation to V1/T1 = V2/T2.

Substituting the given values, we have:

(5.00 L)/(17.5 + 273.15 K) = (7.50 L)/(T2 + 273.15 K)

Solving for T2, we get:

T2 = (7.50 L)/(5.00 L) x (17.5 + 273.15 K) - 273.15 K = 284.8 K

Converting this to Celsius, we have:

T2 = 284.8 K - 273.15 K = 11.7 C

Therefore, the temperature of the gas after it has been stretched out to 7.50 L is 11.7 C.

Know more about Ideal Gas law here:

https://brainly.com/question/4147359

#SPJ11

Four distinct kinds of brass are

Copper zinc brasses contain a combination of copper (Cu) and zinc (Zn). Tin brasses are produced using copper (Cu), zinc (Zn) and tin (Sn). Leaded brasses are involved copper (Cu), zinc (Zn) and lead (Pb). Further kinds of brasses incorporate alpha brass, beta brass and alpha-beta brass.

There are over 60 sorts of brass, the most fundamental categorisation can be considered to bunch all brasses into three primary families, copper zinc brasses (Cu-Zn), Leaded brasses (Cu, Zn, Pb) and tin brasses (Cu, Zn, Sn) these can then be further sub-divided by their more unambiguous properties and uses.Brass is a composite of copper and zinc; how much zinc present is the principal factor influencing types, or grades, of brass. The utilization of brass is legitimate as far back as the third thousand years BCE around the Aegean, Iraq, Georgia and Turkmenistan regions despite the fact that there have been a few segregated finds in China tracing all the way back to the fifth thousand years BCE. The Roman realm involved brass for their coins, and it even gets a notice in the Ruler James' Book of scriptures and in a portion of crafted by Shakespeare.

Brass has a very decorative, radiant brilliant gloss; joined with its high functionality and sturdiness, it provides an ideal answer for the production of hard wearing parts that likewise may should stylishly please. It is utilized to make instruments, machined parts, evaporator parts, fireboxes, elaborate castings, shop fittings, expelled segments, design expulsions, clasp, window outlines, stepped parts, blanked plates, heat exchangers and general copper-smithing applications. Brass doesn't 'ignite' when it is struck, which makes it suitable for use in risky or possibly flammable environments.

Find out more about Brass

brainly.com/question/24088418

#SPJ4

Answer:

the rust formed because of the water sitting in sied a metal bowl for  long time but they can fix this if they get filters

Explanation:

Answer:

Explanation:

The number of molecules can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 4.8 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Josh is washing glasses with soap and water. He is afraid to carry the glasses because they are slippery. Josh could dry them with a towel to keep the glasses from being slippery.

Glasses are visual eyewear that have lenses fixed in a frame that holds them in front of a person's eyes. The frame often has a bridge over the nose and arms that rest over the ears. Glasses are also known as eyeglasses or spectacles.

The term "glasses" likely originated from the word "spyglass," which was originally used to describe "a pair of eyeglasses" that had to be held up to the eyes in order to be fully effective.

Eyeglasses, often known as glasses or spectacles, are lenses that are mounted in frames and worn in front of the eyes to improve vision or to correct astigmatism, myopia, or hyperopia.

Thus,  Josh could dry them with a towel to keep the glasses from being slippery.

To learn more about glasses, follow the link;

https://brainly.com/question/9399000

#SPJ5

The question is incomplete, the complete question is shown in the image attached.

Answer:

1) No, it has the right number of valence electrons but does not satisfy the octet rule.

2) Yes

3) No, it has the wrong number of valence electrons, the correct number is 16

Explanation:

If we look at the first structure in the image(HCN), it easy to see from inspection that nitrogen has three valence electrons as it is normally supposed to have. However, if we count all the electrons around nitrogen, we will notice that they are six instead of eight. Thus nitrogen has not satisfied the octet rule here.

The structure HBr satisfies the octet rule, hence it is a reasonable Lewis structures for the compound shown.

CO2 has 16 valence electrons but the structure shown contains about 20 valence electrons hence it is not a reasonable Lewis structure for the compound.

Yes, in HCO⁺ the proposed lewis structure is reasonable.

No, COCl₂ has the wrong number of valence electrons.

No, OH⁻ has the right valence electron but does not obey the octet rule.

The correct structure for the question can be seen in the image attached below.

Thus, the atoms obey the octet rule and the number of calculated valence electrons corresponds with what we have in the given structure.

Yes, the structure is correct and reasonable.

The calculated number of valence electrons is different from the given structure of 26e⁻, so we can say No, it has a wrong number of valence electrons.

But both H, as well as, O do not obey the octet rule. Therefore, we say No, it has the right number of valence electron but do not obey the octet rule.

Learn more about valence electrons here:

https://brainly.com/question/12717954?referrer=searchResults

Answer:

A

Explanation:

Aromatic hydrocarbons are denser and have poorer self-ignition qualities, and also, they produce more soot in burning.

Answer:

Explanation:

Here, we want to get the new volume of the gas without changing the pressure

From Charles' law, we know that temperature and volume are directly proportional

We have that as:

From the question, we have the given values (we have to convert the given temperature values to Kelvin by adding 273.15 K) as:

V1 is 7.6 L

V2 = ?

T1 is 8 + 273.15 = 281.15 K

T2 is 22 + 273.15 = 295.15 K

Substituting the values, we have that as follows:

Answer:

F₂ (g) + FeI₂ (aq) →  FeF₂ (aq) +  I₂ (l)

Explanation:

Our reactants are:

F₂ → Fluorine gas, a dyatomic molecule

FeI₂ → Iron (II) iodine

Our products are:

I₂ → Iodine

FeF₂ → Iron (II) fluoride

Then, the reaction is:

F₂ (g) + FeI₂ (aq) →  FeF₂ (aq) +  I₂ (l)

We see it is completely balanced.

Answer:

About 7.89g/cm^3, I think.

Explanation:

Find the volume. Divide the mass by the volume.

An empty graduated cylinder is weighs 55.5 g. when filled with the 71.5 ml of  unknown liquid, it weighs 135.0 g. The density of the unknown liquid in g/ml is 29.5 g/L.

The given data :

The mass of empty graduated cylinder = 55.5 g

The volume of the unknown liquid = 50 mL

The mass after the liquid is filled = 135 g

The mass of the liquid = total mass - mass of cylinder

                                      = 135 - 55.5

                                       = 79.5 g

The density is given as :

Density = mass / volume

             = 79.5 / 50

             = 29.5 g/ml

Thus, the density is 29.5 g/L.

To learn more about graduated cylinder here

https://brainly.com/question/2916871

#SPJ4

Ethanol, propane, and butane are all examples of fuels that contain chemical energy. This chemical energy is stored within the molecules of the fuel and can be released during a chemical reaction, such as combustion, to produce heat and/or light energy.

When ethanol, propane, or butane is burned, the chemical bonds between the atoms within the molecule are broken, releasing energy in the form of heat and light. This energy can then be harnessed for various purposes, such as heating buildings or powering vehicles. Overall, the energy content of a fuel depends on the specific molecules it contains and their chemical structures.

To know more about Ethanol click this link -

brainly.com/question/25002448

#SPJ11

The observation that shows a change in state of matter has occurred is option A) Wood burns, producing gas and an ashy residue.

A change in state of matter refers to the transformation of a substance from one physical state to another, such as from solid to liquid, liquid to gas, or vice versa. In option A, when wood burns, it undergoes a chemical reaction known as combustion.

During combustion, the wood reacts with oxygen in the air and undergoes a transformation from a solid state to a gaseous state, producing gas (such as carbon dioxide and water vapor) as well as an ashy residue (solid carbon and other impurities remaining after the combustion process). This change in state is accompanied by the release of heat and light.

Option B, where dew forms on the grass overnight, does not indicate a change in state of matter. Dew formation is a physical process known as condensation, where water vapor in the air cools down and changes into liquid water droplets upon contact with a colder surface (such as grass). In this case, the state of matter remains the same (from a gaseous state to a liquid state), and no new substances are formed.

Option C, where an alkali indicator changes color when added to a cleaner, also does not represent a change in state of matter. It suggests a chemical reaction between the alkali indicator and the cleaner, resulting in a color change. However, the states of matter involved (liquid or solid) do not change during this process.

In summary, option A is the observation that indicates a change in state of matter, as it involves the transformation of wood from a solid state to a gaseous state during combustion.

For more such question on matter visit:

https://brainly.com/question/1172629

#SPJ8

The hydronium ion concentration is \(3.85 \times10-13M\). The formula for the conjugate acid of Cl− is HCl, and the formula for the conjugate base of NH4+ is NH3.

The hydroxide ion concentration in an aqueous solution at 25 ∘C is 0.026M.

The pOH is 1.

Since \(pH + pOH = 14,\)

therefore,

\(pH = 14 - pOH\)

\(pH = 14 - 1\)

\(pH = 13.\)

Therefore, the pH of this solution is 13.

Now, we will calculate the hydronium ion concentration, using the relation;

\(Kw = [H+][OH-]\)

Where

\(Kw = 1.0 \times 10-14[H+][OH-]\)

\(Kw = 1.0 \times10-14[H+][0.026]\)

\(Kw = 1.0 \times10-14[H+]\)

\(Kw = \frac{ (1.0 \times 10-14)}{[0.026][H+]}\)

\(Kw = 3.85 \times 10-13M\)

Therefore, the hydronium ion concentration is \(3.85 \times10-13M.\)

The formula for the conjugate acid of Cl− is HCl, and the formula for the conjugate base of NH4+ is NH3.

For such more questions on hydronium ion

https://brainly.com/question/31742102

#SPJ8

Answer:

4 yards/second is the answer

Answer:

the answer is 4 yards per second

Explanation:

80 yards in 20 seconds

20+20+20+20=80

there are 4, 20s to make 80

in other words...

80÷4=20

hello

the answer to the question is:

a dioxide bond which consists of two ¹⁶O or two oxygens (O2) is a strong stable bond

whereas a sulfide bond consisting of two ³²S or two sulfurs (S2) is not as strong of a bond due to its larger size compared to a dioxide bond

if you're comparing a dioxide molecule to an atom of sulfur, since sulfur naturally is less stable and more reactive, and oxygen bonded molecule either with another oxygen or hydrogen is more stable

in addition, atoms are less stable than molecules, hence a sulfur atom is less stable than a dioxide molecule

Answer:

social studies

Explanation:

Answer:

The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.

Hope this helps :)

Answer:

The limiting reagent is CuCl

Explanation:

The initial number of moles of aluminum, Al = 4.5 moles

The number of moles of copper, Cu = 6.5 moles

The given chemical reaction is presented as follows;

2Al + 3CuCl → 2AlCl₃ + 3Cu

Therefore, we have, 2 moles of aluminum combine with 3 moles of CuCl produces 2 moles of AlCl₃ and 3 moles of Cu

1 mole of Al will combine with (3/2) moles of CuCl,

Therefore, 4.5 moles of Al will combine with (4.5 × (3/2) = 6.75) 6.75 moles of CuCl

Given that the number of moles of CuCl present is only 6.5 moles which is less than the 6.75 moles required to combine with the 4.5 moles, the 6.5 moles of CuCl limits the amount of AlCl₃ and Cu produced, and therefore the CuCl is the limiting reagent.

Answer:

Moles Lost = 0.0335 moles

Explanation:

This type of question requires the Ideal Gas Law equation. The equation looks like this:

PV = nRT

In this formula,

-----> P = pressure (kPa)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (8.314 L*kPa/mol*K)

-----> T = temperature (K)

(Step 1)

To find how many moles were lost, you first need to find how many moles you had to begin with. This can be done by plugging the starting values into the equation and solving for "n". But first, you need to convert Celsius to Kelvin (by adding 273.15).

P = 225 kPa                  R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 25°C + 273.15 = 298.15 K

n = ?

PV = nRT

(225 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(298.15 K)

618.75 = n(2478.8191)

0.250 = n

(Step 2)

Next, you need to find the number of moles in the container after it has been re-sealed. The volume is the same because the container did not change. The process should be the same as above.

P = 185 kPa                   R = 8.314 L*kPa/mol*K

V = 2.75 L                     T = 10°C + 273.15 = 283.15 K

n = ?

PV = nRT

(185 kPa)(2.75 L) = n(8.314 L*kPa/mol*K)(283.15 K)

508.75 = n(2354.1091)

0.216 = n

(Step 3)

Finally, you can find the number of moles lost by subtracting the final amount of moles from the original amount. When doing this calculation, I used the value of the moles saved in my calculator (with more decimal places) to get a more accurate number.

Moles Lost = Initial Moles - Final Moles

Moles Lost = 0.250 moles - 0.216 moles

Moles Lost = 0.0335 moles