3.0 x 10 23 molecules of element Z have a mass of 38 g. What is the mass of 1 mole?

Answer:

The two factors that increase the size of a population are natality, which is the number of individuals that are added to the population over a period of time due to reproduction, and immigration, which is the migration of an individual into a place.

Answer:

Option A, Tectonic plates above the currents move toward each other.

Option C, One plate will submerge beneath another plate.

Option D, A convergent boundary is formed at the site of the collision.

Explanation:

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

- Tectonic plates above the currents move toward each other;

- One plate will submerge beneath another plate;

- A convergent boundary is formed at the site of the collision;

The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.

Answer:

weak acids have a pH of less than 2

Answer:

These reactions are similar because the process is similar and the products are carbon dioxide they are different because the substances are different to outgo these reactions

Explanation:

In water, oxygen is covalently bonded to two hydrogen atoms. Oxygen has the formal charge of zero and hydrogens also has the formal charge of zero.

Formal charge of an atom is the charge it possess in a compound. The formal charge of an atom is found out from its valence electrons, lone pair of electrons and bond pairs.

The equation of formal charge is written as follows:

Formal charge = Valence electrons - (Lone pair + bond pair)

In water, oxygen covalently bonds to two hydrogen atoms. The bond pair of electrons from oxygen is 2.

number of valence electrons in oxygen = 6

no.of lone pairs = 4

Then FC = 6 - (4 + 2) = 0

Therefore, the formal charge of oxygen in water is zero.

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Answer:

We can seprate oil and water by the process of seprating funnel

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem

Explanation:

Hey there! :)

Answer:

C. Number of outer shell electrons.

Explanation:

Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.

For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.

Answer:

number of outer shell electrons.

Explanation:

Answer:

The evidence goes against A. Expanding Earth and B. Contracting Earth

Answer : The mass of [tex]O_2[/tex] produced is, 384 grams.

Explanation : Given,

Moles of [tex]KClO_3[/tex] = 8.00 mol

First we have to calculate the moles of [tex]O_2[/tex]

The balanced chemical equation is:

[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]

From the reaction, we conclude that

As, 2 moles of [tex]KClO_3[/tex] react to give 3 moles of [tex]O_2[/tex]

So, 8.00 mole of [tex]KClO_3[/tex] react to give [tex]\frac{3}{2}\times 8.00=12[/tex] mole of [tex]O_2[/tex]

Now we have to calculate the mass of [tex]O_2[/tex]

[tex]\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2[/tex]

Molar mass of [tex]O_2[/tex] = 32 g/mole

[tex]\text{ Mass of }O_2=(12moles)\times (32g/mole)=384g[/tex]

Therefore, the mass of [tex]O_2[/tex] produced is, 384 grams.

Answer:

Cl₂ > Br₂ > I₂

Explanation:

An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.

Oxidizing ability decreases down the group.

Therefore Cl₂ > Br₂ > I₂

Answer:

34.08 g

Explanation:

Take the atomic mass of N=14.0, H=1.0/

no. of moles=mmass/molar mass

no. of moles of N2 used = 28.02 / (14x2)

=1.0007mol

From the equation, the mole ratio of N2 : NH3 = 1: 2,

so one mole of N2 produces 2 moles of NH3.

Using this ratio, we can deduce that the no. of moles of NH3 = 1.0007x2

= 2.001428mol

mass = no. of moles x molar mass

Hence,

mass of NH3 produced = 2.001428 x (14+1x3)

= 34.03

≈C

Answer:

Ph.D

Explanation:

For the most part, research scientists need a bachelor's degree in a highly associated field. A master's degree or a doctorate is frequently expected.

Answer:

52. The alcohol USED => methanol, CH3OH

The carboxylic acid USED => propanoic acid, CH3CH2COOH.

53. The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Explanation:

52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:

CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O

The alcohol used: methanol, CH3OH

The carboxylic acid used: propanoic acid, CH3CH2COOH.

53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react

Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:

HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O

The alcohol USED => Ethanol, CH2CH3OH

The carboxylic acid USED => Formic acid, HCOOH.

Answer:

Energy was added, so the reaction is endothermic.

Explanation:

Answer:

A. Energy was added, so the reaction is endothermic

Explanation:

Answer:

i think its false because heat is defined as the sum of kinetic enegry present in the molecules of substances.

Answer:

When reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. When a product is added, the equilibrium moves in order for reactants to reduce the stress.

Explanation:

:)

It should be noted that when a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product.

It should be noted that a reactant simply means a substance that takes part in a chemical reaction to form products.

When a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. Also, when a product is added, the equilibrium moves in order for reactants to reduce the stress. This is vital for the reaction.

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Answer:

c). 2-iodopropane

14) C). Fluoroethene

16) D). More chemically reactive

17) 1). High temperature combustion  - Dioxins/furans

2). Pulp and paper industry  - SO2(g)

3). Pesticides  - Phosphates

4). Sour gas plants - Nox(g)

Explanation:

The correct name for molecule I would be '2-iodopropane' where the number 2 reflects the position of iodine. There are three carbons and 8 hydrogen atoms which reflect that it is an alkane compound. In the given carbon chain. In this chain of three carbons, iodine is present on the second carbon. Therefore, option C is the correct answer.

14). The appropriate name for molecule III exemplifies Fluoroethene as it consists of two carbons due to which it belongs to the 'ethane' group and it bears the prefix 'fluoro as it belongs to fluorine group and the suffix '-ene' due to double bond.

16). Synthetic hydrocarbons are 'more chemically reactive' and therefore, it generates greenhouse gases and leads to climate change, global warming, depletion of the ozone layer, etc.

17). 1). Dioxins are generated as a result of high-temperature combustion processes like commercial waste incineration or burning of fuels.

2). Pulp and paper industry releases various gases like nitrogen oxide, sulfur dioxide SO2(g), carbon dioxide, etc.

3). Phosphate is the pollutant released from pesticides that badly affects the fertility of the soil.

4). Nox(g) nitrogen oxide released by sour gas plants and coal-fired emissions is a major contributor to increased greenhouses gases and global warming.

Answer: Plasma

Explanation: Plasma is the state of matter where the substance is ionized and has no definite shape or volumen. The fact of being ionized makes the substance a good electrical conductor.

Matter generally exists in three physical states, namely solid, liquid and gaseous states. The three states mainly differ in the arrangement of particles and the force of attraction among the constituent particles. Here plasma is characterized by ionized particles. The correct option is C.

Plasma is a hot ionized gas which contains equal numbers of positively and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that it is considered as the fourth state of matter.

Since plasma are made up of electrically charged particles, they are strongly influenced by electric and magnetic fields while neutral gases are not. Like gases plasmas have no fixed shape or volume and are less dense than solids or liquids.

Plasma is a superheated matter, so hot that the electrons are ripped away from the atoms forming ionized gas. It comprises over 99% of the visible universe.

Thus the correct option is C.

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Answer:

Four ways to test a copper penny are given below:-

Explanation:

Answer:

A. 20 grams of milk at 10°C

Explanation:

Since we refrigerate milk, it would be cooler than the room temperature, which standard norm is 25°C. So the milk has to be colder than the room temperature. Therefore, our answer is A.

Answer: A is the correct answer

Explanation:

The temperature of room temperature is more than that and you need to keep it colder, hope this helped!

Answer:

12%

Explanation:

Answer:

A. Argon

Explanation:

Argon is a nonmetal. It is a noble gas with an atomic number of 18.

Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.

Given the following data:

An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.

This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.

In Chemistry, the following chemical elements have this atomic number:

Note: Both group 1 and 2 chemical elements are metals.

However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.

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A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.

Hence, Option (B) is correct answer.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

Now lets check all options one by one

Option (A): Double displacement

A double displacement is a chemical reaction in which elements are exchange between the two compounds.  In the given reaction F₂ is not a compound. so this reaction cannot occur

Hence, option (A) is incorrect.

Option (B): Single displacement

A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.

In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.

Hence, option (B) is correct.

Option (C): Synthesis

A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.

In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.

Hence, option (C) is incorrect.

Option (D): Decomposition

A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.

In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.

Hence, option (D) is incorrect.

Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.

Hence, Option (B) is correct answer.

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Answer:

D. 1:1

Explanation:

For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).

So, the mole ratio of chlorine to calcium chloride is 1:1.

Hope this helps. :)

The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.

Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.

Given chemical reaction is:

Ca + Cl₂ → CaCl₂

From the stoichiometry of the given reaction it is clear that,

1 mole of chlorine = reacts with 1 mole of calcium chloride

So, mole ratio = Chlorine / calcium chloride = 1:1

Hence required mole ratio is 1:1.

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Answer:

Solar elevation.

Ozone.

Cloud cover.

Ground surface reflectivity.

Altitude.

Aerosols and pollutants.

Direct and diffuse UV.

I'm not sure if this was what you were looking for, but if it helps please mark me as brainliest.

Answer:

it is 90.0

Explanation: