Pb(NO3)2+K2CrO4 →PbrCrO4 +2KNO3 classify the chemical reaction

Answer:

2

Explanation:

According to the concept of valency, 2 moles of oxygen are needed to react with 100.0 grams of aluminum.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

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Answer:

36

Explanation:

There are 6 Carbon atoms, 12 Hydrogen atoms, and 18 Oxygen atoms.

Explanation:

Due to the positive value of the change in temperature, this is an endothermic reaction.

Since the forward reaction is endothermic, increasing the temperature increases the equilibrium constant (k).

In an equilibrium system, the position of the equilibrium will move in a way to annul the change made to the system. An increase in temperature for an endothermic reaction would favour the reaction, leading to increase in amount of products and decrease in amount of reactants.

Answer:

26.34 moles

Explanation:

Answer:

1+2 = 12

Explanation:

this is a math equation, not a chemical formula

Answer:

The ability of an atom to attract electrons.

Explanation:

Electronegativity is the ability of an atom to attract electrons.  In a bonded pair, electrons tend to stay closer to the more electronegative atom.  Atoms become more electronegative near the top right of the Periodic Table, with the highest electronegativity being Fluorine.

Answer:

D. The flesh should return to normal after you press it.

Explanation:

The water content stored in the flesh of the fish, paired with the elasticity are both indicators of freshness, and will cause the flesh to return to normal after its been pressed.

Given :

Number of He atoms, [tex]n = 3.4\times 10^{24}[/tex] atoms.

To Find :

How many grams are their in given number of He atoms.

Solution :

We know, molecular mass of He is 4 g. It means that their are [tex]6.022 \times 10^{23}[/tex] atoms in 4 g of He.

Let, number of gram He in [tex]3.4\times 10^{24}[/tex] atoms is x , so :

[tex]x = \dfrac{3.4\times 10^{24}}{6.022\times 10^{23}}\times 4\\\\x = $$22.58\ g[/tex]

Therefore, grams of He atoms is 22.58 g .

Answer:

Ok so, I would say D) because decreasing the blood glucose is actually recycling the organic chemicals. Your body uses everything in your body, filtering out the unusable chemicals and such.

Explanation:

Science :3

Answer:

Explanation:

Gravity and oppositely charged particles will both experience attractive forces

Answer: 2 moles

Explanation:

AM of Al 27

Na more reactive than Cu

Given

Copper in a solution of NaCl

Required

The displacement theory

Solution

A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

The voltaic series:  

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au  

The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)  

The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)

Reaction

Cu + NaCl≠

The existing copper element can not replace the sodium element, which is on the left side so the reaction will not occur.

But if it is reversed, then a reaction can occur

2 Na + CuCl2 → Cu + 2 NaCl

Answer:

A reflected ray always comes off the surface of a material at an angle equal to the angle at which the incoming ray hit the surface. In physics, you'll hear this called the law of reflection. You've probably heard this law stated as "the angle of incidence equals the angle of reflection

Explanation:

Answer: Equilibrium

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equals to rate of the backward reaction which means the products are being made as quickly as reactants

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

Answer:

monke

Explanation:

because my mum told me we are all monke

Answer:

a) Chlorine Trifluoride

b) Dichlorine Heptoxide

GOOD LUCK FOR FUTURE! :)

Answer:

The correct answer is - alkali or base.

Explanation:

The litmus paper test is used to find whether a solution is basic or acidic. In a litmus paper test, a litmus paper is a dip in a particular or desired solution that turns the color of litmus paper to red, blue, or purple based on the pH of the solution.

If the paper turns red it means the solution is acidic, in a neutral solution it turns to the purple color and if the blue color appears then it is a basic or alkali solution. The solution of baking soda turns litmus paper into blue color which means baking soda is most likely a base.

Answer:

D) A positive but not linear relationship

Explanation:

This comes from the equation Ek=1/2mv^2

Where Ek is Kinetic Energy, m is mass, and v is the speed (or velocity).

As we can see in the equation, the relation is not linear but quadratic and it is positive.

Answer:

D) A positive but not linear relationship

Explanation:

Speed is equal to distance divided by time. ... Therefore, the kinetic energy of an object is proportional to the square of its velocity (speed). In other words, If there is a twofold increase in speed, the kinetic energy will increase by a factor of four.

Explanation:

Prior preparation is required in a location at risk of natural disasters, this includes a communication system and infrastructure aimed at protecting and educating society. Technology is extremely important for the prevention of natural disasters, through forecasting and monitoring systems it is possible to map and analyze the possible risks and anticipate them with the necessary solutions, such as removing a population from a certain location with a risk of drilling.

It is necessary for the population to be aware, understand the alerts and signals issued in case of risk and follow the guidelines of the trained authorities, in this way it is possible to mitigate the effects of natural disasters.

Answer:

See Explanation

Explanation:

The question is incomplete; as the mixtures are not given.

However, I'll give a general explanation on how to go about it and I'll also give an example.

The percentage of a component in a mixture is calculated as:

[tex]\%C_E = \frac{E}{T} * 100\%[/tex]

Where

E = Amount of element/component

T = Amount of all elements/components

Take for instance:

In [tex](Ca(OH)_2)[/tex]

The amount of all elements is: (i.e formula mass of [tex](Ca(OH)_2)[/tex])

[tex]T = 1 * Ca + 2 * H + 2 * O[/tex]

[tex]T = 1 * 40 + 2 * 1 + 2 * 16[/tex]

[tex]T = 74[/tex]

The amount of calcium is: (i.e formula mass of calcium)

[tex]E = 1 * Ca[/tex]

[tex]E = 1 * 40[/tex]

[tex]E = 40[/tex]

So, the percentage component of calcium is:

[tex]\%C_E = \frac{E}{T} * 100\%[/tex]

[tex]\%C_E = \frac{40}{74} * 100\%[/tex]

[tex]\%C_E = \frac{4000}{74}\%[/tex]

[tex]\%C_E = 54.05\%[/tex]

The amount of hydrogen is:

[tex]E = 2 * H[/tex]

[tex]E = 2 * 1[/tex]

[tex]E = 2[/tex]

So, the percentage component of hydrogen is:

[tex]\%C_E = \frac{E}{T} * 100\%[/tex]

[tex]\%C_E = \frac{2}{74} * 100\%[/tex]

[tex]\%C_E = \frac{200}{74}\%[/tex]

[tex]\%C_E = 2.70\%[/tex]

Similarly, for oxygen:

The amount of oxygen is:

[tex]E = 2 * O[/tex]

[tex]E = 2 * 16[/tex]

[tex]E = 32[/tex]

So, the percentage component of oxygen is:

[tex]\%C_E = \frac{E}{T} * 100\%[/tex]

[tex]\%C_E = \frac{32}{74} * 100\%[/tex]

[tex]\%C_E = \frac{3200}{74}\%[/tex]

[tex]\%C_E = 43.24\%[/tex]

Answer:

261.3368

Explanation:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Ba(NO3)2, or 261.3368 grams.

Answer:

Explanation:

The objects velocity will decrease because the force is opposing its motion

Answer:

By passing the gas through lime water

Explanation:

The equation of the reaction of vinegar with  calcium carbonate in the form of marble chips is shown below;

CaCO3(s) + 2CH3COOH(aq) ---------> Ca(CH3COO)2(aq) + H2O(l) + CO2(g).

We can see from the reaction equation that the gas produced is carbon dioxide. This gas is identified by passing the gas through lime water. If lime water turns milky, then the gas is truly carbon dioxide.

Answer:

it is synthesis reaction

Answer:

3.

D. Philippine Atmospheric, Geophysical and Astronomical Services

Administration (PAGASA)

Explanation:

4.C. 62.0 kph

3) The agency that tracks the activities of typhoon that enters PAR is; D. Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA)

4) The speed of the typhoon is; C: 62 kph

3) PAR simply means Phillipines Area of responsibility.

Now this PAR is an area located at the Northwestern Pacific and it is the place where the Philippines' national meteorological agency called Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) usually monitors the weather occurrences.

This means that the typhoons that enter PAR would also be monitored by PAGASA.

4) we are given;

Distance of Typhoon Grasya from Bislig city; d = 186 km

Time at which landfall is expected; t = 3 hours.

Formula for speed is;

Speed = distance/time

Speed = 186/3

Speed = 62 kph

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Explanation:

The reaction is given as;

SO2(g) ⇄ S(s) + O2(g) ΔH° = 297 kJ

This reaction is an endothermic reaction because of the positive value of the  ΔH°. Increasing the temperature for an equilibrium reaction with froward reaction being endothermic leads to increase in equilibrium constant (K).

Regarding equilibrium concentration;

In an equilibrium reaction, any change to the system is annuled. If there is an increase in temperature, in order to annul that, the forward reaction is favoured leading to increase in concentration of of the products and decrease in reactants.