Why does a reaction slow down with time?
O A. The exponents in the equation change.
B. Molecules stop reacting when they collide.
C. The rate constant decreases over time.
D. The reactant concentrations decrease.

Answer:

Explanation:

157

Answer:

[tex]\boxed {\boxed {\sf 4.80 \ grams \ Xe}}[/tex]

Explanation:

To convert from atoms to grams, we must first convert atoms to moles, then moles to grams.

To convert from atoms to moles, we must use a special number called Avogadro's number. It tells us the number of particles in 1 mole. In this case, the particles are atoms of xenon.

[tex]6.022 * 10^{23} \ atoms \ / 1 \ mol[/tex]

We can write this number as a ratio or fraction.

[tex]\frac{6.022 * 10^{23} \ atoms} { 1 \ mol}[/tex]

Then, multiply by 2.20 * 10²² atoms.

[tex]2.20 * 10^{22} \ atoms \ Xe *\frac{6.022 * 10^{23} \ atoms \ Xe \ } { 1 \ mol \ Xe}[/tex]

We want the atoms of xenon to cancel, so we flip the fraction.

[tex]2.20 * 10^{22} \ atoms \ Xe *\frac{1 \ mol \ Xe\ } { 6.022 * 10^{23} \ atoms \ Xe }[/tex]

Now, we can multiply and the atoms of xenon will cancel.

[tex]2.20 * 10^{22} \ *\frac{1 \ mol \ Xe\ } { 6.022 * 10^{23} \ }[/tex]

[tex]\frac {2.20 * 10^{22} *1 \ mol \ Xe\ } { 6.022 * 10^{23} \ }[/tex]

[tex]\frac {2.20 * 10^{22} \ mol \ Xe\ } { 6.022 * 10^{23} \ } = 0.03653271338 \ mol \ Xe[/tex]

Now, convert moles to grams. We need to find the molar mass of xenon, which is on the Periodic Table.

Now, use the molar mass as a ratio.

[tex]\frac{131.29 \ g \ Xe}{1 \ mol \ Xe}[/tex]

Multiply by the number of moles we found above.

[tex]0.03653271338 \ mol \ Xe * \frac{131.29 \ g \ Xe}{1 \ mol \ Xe}[/tex]

The moles of xenon will cancel.

[tex]0.03653271338 * \frac{131.29 \ g \ Xe}{1 }[/tex]

The 1 as a fraction is irrelevant, so we can just multiply.

[tex]0.03653271338 * {131.29 \ g \ Xe= 4.79637994 \ g \ Xe[/tex]

The original number (2.20) had 3 significant figures (2,2, and 0). We must round to 3 sig figs, which is the hundredth place.

The 6 in the thousandths place tells us to round the 9 to a 0 in the hundredth place, which bumps the 7 to an 8. We must still leave the 0 though, because it is the third significant figure.

[tex]4.80 \ g \ Xe[/tex]

There are about 4.80 grams of xenon in 2.20 *10²² atoms.

Answer:

The solution was unsaturated

Explanation:

B.) absorb energy as it goes to the ground state

Answer:

b

Explanation:

Answer: false

Explanation:

Answer:

Rb+

hope it's right:)

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Answer:

Graphite is insoluble in water and organic solvents - for the same reason that diamond is insoluble. Attractions between solvent molecules and carbon atoms will never be strong enough to overcome the strong covalent bonds in graphite. conducts electricity.

Explanation:

Brainlest please?

Answer:

Bro,it's  number A

+3

Explanation:

The oxidation number for chlorine in HClO2 is plus three because oxygen is more electronegative than chlorine and is assigned negative two for each oxygen and hydrogen had a plus one. The sum of oxidation numbers is equal to the charge on the molecule, in this case zero.

An independent variable in chemical reactions showing reactivity of metals with  hydrochloric acid is concentration of acid.

Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.

There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical reactions:

1) inorganic reactions

2)organic reactions

3) biochemical reactions

During chemical reactions atoms are rearranged and reactions are accompanied by an energy change as new substances are formed.

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Answer:

iron

Explanation:

the rest are chemical compouds like h20 and NaCl and cabron dioxide is one too

Explanation:

We can tell if a chemical reaction has taken place when one or more of the following things happen:

1.There has been a colour change inside the reaction flask.

2. A gas has formed. Usually we know a gas has formed when we can see bubbles.

3.A solid has formed.

hope this answer helps!!!

Explanation:

A Chemical Reaction Is Usally Accompaneid by easly observed physical effects such as the emissions of heat and light the information of a precipitate the evaluation of gas,or a color change

ye

Explanation:

yes of course you can

Answer:

properties that have volume, mass, weight, length or circumference.

Explanation

these all can be measured

Answer: 17.2 g

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of} HgS=\frac{20.0 g}{233g/mol}=0.085moles[/tex]

The balanced chemical equation is:

[tex]4HgS(s)+4CaO(s)\rightarrow 4Hg(l)+3CaS(s))+CaSO_4(s)[/tex]  

According to stoichiometry :  

4 moles of [tex]HgS[/tex] produce =  4 moles of [tex]Hg[/tex]

Thus 0.085 moles of [tex]HgS[/tex] will require=[tex]\frac{4}{4}\times 0.085=0.085moles[/tex]  of [tex]Hg[/tex]

Mass of [tex]Hg=moles\times {\text {Molar mass}}=0.085moles\times 200.6g/mol=17.2g[/tex]

Thus 17.2 g of [tex]Hg[/tex] will be produced form 20.0 g of HgS.

Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, system attains stability when a system loses energy.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

q = n ×ΔH

where

q = amount of heat

n = no of moles

ΔH = enthalpy

n = w / M.M

w = given mass

M.M = molar mass

If the system loses a certain amount of energy, that same amount of energy is gained by the surroundings. The enthalpy value comes out to be negative. The reaction is called exothermic reaction. System attains stability when a system loses energy.

Therefore, system attains stability when a system loses energy.

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Given :

15 gram of ice is kept at 0°C.

To Find :

How much heat is required to melt 15 grams of ice at 0°C.

Solution :

We know, specific heat of Ice, L = 334 J/g.

Heat required to melt m gram of ice to water at 0°C is :

[tex]H = mL\\\\H = 15\times 334\ J\\\\H = 5010\ J\\\\H = 5.01\ kJ[/tex]

Therefore, heat is required to melt 15 grams of ice at 0°C is 5.01 kJ.

Explanation: D and G

Answer:

0.07 moles of water

Explanation:

Given data:

Number of molecules of water = 4.22×10²²

Number of moles of water = ?

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules of water

4.22×10²²  molecules × 1 mol /6.022 × 10²³ molecules  

0.7 ×10⁻¹ mol

0.07 moles of water

Answer:

Maaaan f pluto

Explanation:

All my homies hate pluto

Well scientificly yes, I agree. This mainly is due to the fact that pluto does not meet the qualifications of a planet and behaves more similarly to the patterns of a dwarf planet. For example, pluto moves in an oblong cycle around the sun and not a "perfect circle". It almost seems that pluto is thrown off its path.

Answer:

yes

Explanation:

Answer:

Yes it can

Explanation:

Answer:

Hot chocolate is as straightforward as drinks go: at its core, it's milk, cocoa powder, and sugar. Despite its simplicity, this cold-weather classic is swirling with science. The backbone of any decent hot chocolate is milk. Beyond water, milk is perhaps the most basic and familiar substance to humans.

Answer:

metallic

Explanation:

Answer:

aaaaahhhhhhhhhhhhhhhhhhhhhhhhhh

Explanation:

Answer:

Ionic bonding occurs when atoms either gain or lose one or more valence electrons, resulting in the atom having either a negative or positive charge.

Through ionic bonding, an atom of each element will combine with the other to form a molecule, which is more stable since it now has a zero charge.

Explanation:

Answer:

Ionic bonding occurs when atoms either gain or lose one or more valence electrons, resulting in the atom having either a negative or positive charge.

Explanation:

Hope this helps!!:)

Answer:

its b

Explanation:

Answer:

B. Water exhibits strong adhesion and cohesion, which allows capillary action to occur.