A radioactive element has a half- life of 2 days. Which fraction represents the amount of an original sample of this element remaining after 6 days?

Answer:

A component's mass number (A) is the amount of the quantity of protons and the quantity of neutrons. The little commitment of mass from electrons is dismissed in ascertaining the mass number.

Explanation:

Answer:  It is more difficult to remove a valence electron from a Chlorine (Cl) atom

Explanation:

Ionization energy is the energy required to remove the valence electron from an isolated gaseous atom.

Magnesium (Mg) is the 12th element of periodic table and has an atomic number of 12. The electronic configuration is 2, 8, 2. It can easily lose its valence 2 electrons to attain stable configuration.

Chlorine (Cl) is the 17th element of periodic table and has an atomic number of 17. The electronic configuration is 2, 8, 7. It has a tendency to gain electron to attain stable configuration. It cannot lose its valence electron easily as the valence electrons experience more nuclear charge.

Thus it is more difficult to remove a valence electron from a Chlorine (Cl) atom

Chlorine(Cl) is the more difficult to remove a valence electron from which is

because it needs one electron to achieve a stable octet configuration.

Magnesium (Mg) is an element which has an atomic number of 12. The

electronic configuration is 2, 8, 2. This means it has to lose its  2 valence

electrons needed to attain a stable octet configuration.

Chlorine (Cl) is an element which has an atomic number of 17. The electronic

configuration is 2, 8, 7. This means it has to gain one valence electrons

needed to attain a stable octet configuration.

Thus it is more difficult to remove a valence electron from a Chlorine (Cl)

atom than Magnesium atom.

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Answer:

the rate of reaction would decrease

Explanation:

Answer:

A

Explanation:

In a hot car, the air molecules are heated, which cause them to speed up. The fast speed of these air molecules cause them to bounce off each other and the walls faster and harder, which will increase the pressure in the car.

We have that what happens inside a closed car on a hot day is

From the question we are told

What happens inside a closed car on a hot day?

A. The pressure inside the car increases.

B. The number of molecules increases.

C. The volume inside the car increases.

D. The molecules of gas slow down.

Generally

Inside a closed car on a hot day the volume inside a car increases.

the molecules of gas gets active with increase in kinetic energy of the molecules increases hitting the walls of the car and the sun also expands the metal walls of the car

Thereby increasing the pressure of molecules in the car

Inside a closed car on a hot day the volume inside a car increases.

Hence

What happens inside a closed car on a hot day is

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Answer:

Flashlight

Explanation:

A flashlight gives out heat

hope this helps...

Answer:

Explanation:

ok if yes do follow

Answer:

Exothermic reaction for the HCl, endothermic reaction for the water

[tex]2803.28\ \text{J}[/tex]

Explanation:

Heat was lost by HCl as its temperature lowered, so it was an exothermic reaction for the HCL.

Heat was gained by water as its temperature increased, so it was an endothermic reaction for the water.

m = Mass of water = 100 g

c = Specific heat of water = [tex]4184\ \text{J/kg}^{\circ}\text{C}[/tex]

[tex]\Delta T[/tex] = Change in temperature of water = [tex](31.3-24.6)^{\circ}\text{C}[/tex]

Heat is given by

[tex]Q=mc\Delta T\\ =0.1\times 4184\times (31.3-24.6)\\ =2803.28\ \text{J}[/tex]

Heat gained by water is [tex]2803.28\ \text{J}[/tex].

The relative molecular mass of the gas​ : 64 g/mol

Given

Helium rate = 4x an unknown gas

Required

The relative molecular mass of the gas​

Solution

Graham's Law

[tex]\tt \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

r₁=4 x r₂

r₁ = Helium rate

r₂ = unknown gas rate

M₁= relative molecular mass of Helium = 4 g/mol

M₂ = relative molecular mass of the gas​

Input the value :

[tex]\tt \dfrac{4r_2}{r_2}=\sqrt{\dfrac{M_2}{4} }\\\\16=\dfrac{M_2}{4}\\\\M_2=64~g/mol[/tex]

Answer:

6.02 x 10²³molecules

Explanation:

From the problem statement, we have been given the number of moles of the carbon dioxide to be 5.47°;

  Any number raised to the power of 0 is 1,

So,

 The number of carbon dioxide is 1

From mole concept;

    1 mole of any substance contains 6.02 x 10²³molecules

The number of molecules in the carbon dioxide is 6.02 x 10²³molecules

Answer:784.532 newton

Answer:

It would be thermal energy.

Explanation:

Thermal energy is the energy transfer of heat which is created while doing physical activity.

Answer:

maybe 2455.2, good luck

Answer:

Decomposition

Explanation:

H2CO3 Breaks down to H2O and CO2

Answer:

E

Explanation:

The molecules A and B are shown in the image attached.

Intermolecular hydrogen bonding exists between hydrogen and an electronegative atom when the hydrogen is attached to a strongly electronegative atom. Hydrogen bonding is common in compounds such as HF, HCl, H20, CH3OH etc

Hydrogen bonding can occur between atoms 2 and 4 since they satisfy the conditions mentioned above. atom 3 can not participate in hydrogen bonding because the hydrogen is not attached to a highly electronegative element,

In this exercise we have to use the knowledge of chemistry to be able to describe the hydrogen bonds in the informed molecules:

We can say that the hydrogen bonds are all single in both molecules and we get in molecule A one bond and in molecule B six bonds.

Intermolecular hydrogen stick exists middle from two points hydrogen and an electronegative smallest part of something when the hydrogen is socially join to a strongly electronegative smallest part of something. Hydrogen fasten is generally known fashionable compounds such as HF, HCl, H20, CH3OH etc

Hydrogen fasten can occur middle from two points atoms 2 and 4 because they satisfy the environment noticed above. atom 3 can not take part in hydrogen fasten because the hydrogen exist not attached to a very electronegative essential feature.

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The theoretical yield of urea : = 227.4 kg

Given

Reaction

2NH3(aq)+CO2(aq)→CH4N2O(aq)+H2O(l)

128.9 kg of ammonia

211.4 kg of carbon dioxide

166.3 kg of urea.

Required

The theoretical yield of urea

Solution

mol Ammonia (MW=17 g/mol)

=128.9 : 17

= 7.58 kmol

mol CO₂(MW=44 g/mol) :

= 211.4 : 44

= 4.805 kmol

Mol : coefficient of reactant , NH₃ : CO₂ :

= 7.58/2 : 4.805/1

=3.79 : 4.805

Ammonia as limiting reactant(smaller ratio)

Mol urea based on mol Ammonia :

=1/2 x 7.58

=3.79 kmol

Mass urea :

=3.79 kmol x 60 g/mol

= 227.4 kg

Answer:

yes

Explanation:

big brain

Explanation:

kinetic energy is the energy an object has while in motion, if I'm walking I have kinetic energy

Answer:

Kinetix energy: of an object is the energy that it possesses due to its motion. ( nvm sorry youre working on chemistry)

Answer:

Mud

Explanation:

Mud is a solid mass and water is a liquid mass.  The water takes some attributes of the solid and mixes the two forms of matter.  both masses create mud  it's basic alchemy

Explanation:

An element is a distinct substance that cannot be split - up into simpler substances. Such substances consist of only one kind of atom.

From the list, the elements are:

helium

aluminum

A compound is substance composed of two or more kinds of atoms or elements joined together in a definite grouping. The properties of a compound are distinct and different from those of the individual elements that are combined in its make - up.

methane

water

Table sugar

A mixture is a substance made up of indefinite composition. The constituents reacts differently to changed conditions. They are easily separated into constituents by physical methods.

Vinegar

Steel

Milk

Answer:

Explanation:

The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom. ... (10-15 m is typical for the smaller nuclei; larger ones go up to about 10 times that.) Mass. Although it is very small, the nucleus is massive compared to the rest of the atom.

Answer: No that is false.

Explanation: There are 6 basic elements of life here they are. Have cells, have chemicals, respond to stimuli, reproduce, grow and develop, and use energy.

Answer:

b) 2

Explanation:

The Wurtz reaction is a reaction in which the hydrocarbon chain in lengthened by reaction two alkyl halides with sodium. The reaction is carried out in dry ether.

When methyl iodide reacts with  ethyl iodide, two products are formed; the hydrocarbon product and sodium iodide.

                              Na/Ether

CH3CH2I + CH3I ----------> CH3CH2CH3 + 2NaI

Answer:

5 1 2 4and 3 this is correct way

Answer:

A chemical change

Explanation:

The marshmallow turning brown and bubbling implies that a chemical change has taken place.

For chemical changes to occur, we observe any of the following:

ii. Two signs that shows a chemical change has taken place is that:

Answer:

atomic number of phosphorous is 15. It has zero charges because it has equal number of protons and electrons

Explanation: