When K2Cr2O7 is cooled from 80oC to 20oC, how much solute will precipitate out of the solution?

Answer:

An example of heatwaves showing physical and chemical change is with a burning candle, when a candle burns, there is both a physical and chemical reaction.

The physical change is quite obvious and in fact, it can be seen. When the candle burns, the wax slowly melts and the candle gets smaller and smaller. This wax, as can be seen, will drip onto the candle and stick to it. When this wax forms back into a solid and stays on the candle, that is another physical change that can occur.

The chemical reaction can be a little less obvious. The first is that the heat produced by the candle consumes both the oxygen around it, as well as the fuels coming from the flame. This will then lead to carbon dioxide emissions produced by the flame, which by the way should never be inhaled. This is the chemical change that takes place in the reaction.

Answer:

L=0.85M

Explanation:

ca3 (po4)

66gX1mol/310.18g=2.2178mol/2.5

Answer:

Option (2)

Explanation:

Boyle's states that at constant temperature, volume of a gas is inversely proportional to the pressure exerted by the gas.

In other words, at constant temperature, multiplication of pressure and volume of the gas is constant.

PV = k

Here 'k' = constant

From the graph attached,

[tex](V_3,P_3)[/tex] represents (0.5, 200).

0.5 × 200 = k

k = 100

For pressure 'P' = 150 kPa

150 × V = 100

V = [tex]\frac{100}{150}[/tex]

V = 0.67 L

Option (2) is the answer.

Answer:

2 is the right answer so be it

Explanation:

babe I wish I knew I would tell you

Answer:

Not all men are like this. It depends on how they were raised

Answer: The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]

Explanation:

[tex]HC_2H_3O_2\rightarrow H^+C_2H_3O_2^-[/tex]

 cM           0M           0M

[tex]c-c\alpha[/tex]        [tex]c\alpha[/tex]          [tex]c\alpha[/tex]  

So dissociation constant will be:

[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]

a) Given c= 0.10 M and [tex]\alpha[/tex] = ?

[tex]K_a=1.8\times 10^{-5}[/tex]

Putting in the values we get:

[tex]1.8\times 10^{-5}=\frac{(0.10\times \alpha)^2}{(0.10-0.10\times \alpha)}[/tex]

[tex](\alpha)=0.013[/tex]

[tex]\%(\alpha)=0.013\times 100=1.3\%[/tex]

b) Given c= 0.010 M and [tex]\alpha[/tex] = ?

[tex]K_a=1.8\times 10^{-5}[/tex]

Putting in the values we get:

[tex]1.8\times 10^{-5}=\frac{(0.010\times \alpha)^2}{(0.010-0.010\times \alpha)}[/tex]

[tex](\alpha)=0.041[/tex]

[tex]\%(\alpha)=0.041\times 100=4.1\%[/tex]

The percent ionization is higher for 0.010 M solution of [tex]HC_2H_3O_2[/tex]

Answer:

7:4

Explanation:

The coefficients of a balanced chemical equation give us the mole ratios. The coefficient of carbon dioxide here is 4 and oygen is 7.

Answer:

electroluminescence is a production of light by the flow of electrons, as within certain crystals. An example is at most resataurants with a bright sign that either says open or closed.

Explanation:

Answer:

B.

Solar energy is converted into chemical potential energy, which is found in the products like glucose.

Explanation:

According to photosynthesis phenomena ,the statement which compares energy transformations in ecosystem  within photosynthetic organisms is statement B.

It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy  through the process of cellular respiration.

Some of the energy which is converted  is stored in molecules of carbohydrates like sugar and starches  which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis  are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.

The process begins with proteins absorbing light energy  which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.

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Answer:

Boron

Explanation:

Answer:

Boron

Explanation:

Boron is the first element of Group 13 and is the only metalloid of the group. Its chemical symbol is B, and it has an atomic number of 5. Boron has the electron configuration [He] 2s 2 2p 1 and prefers an oxidation state of +3. Boron has no natural elemental form; it forms compounds which are abundant in the Earth's crust.

Answer:

52- the 30 he has already = $22

22/5= 4.4

he will have to babysit 5 times

Answer:

The growing human population is putting increasing demands on natural resources.

Explanation:

In an ecosystem, the most important reason for people to carefully manage natural resources is that the  growing human population is putting increasing demands on natural resources.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

50distance and 10minutes time

Explanation:

because it's the best object

Answer:

Explanation:    

Answer:

Decomposers (either Secondary Consumer or Tertiary Consumer)

Explanation:

Decomposers eat dead materials and break them down into chemical parts. ... They keep the ecosystem free of the bodies of dead animals or carrion. They break down the organic material and recycle it into the ecosystem as nutrients. Vultures, Blowflies, hyenas, crabs, lobsters and eels are examples of scavengers.

Answer:

Ye,,it is true that Mars is bigger than mercury.

Explanation:

Actually,Mercury is the smallest planet in the solar system.

Answer:10-^7M

Explanation: this is a neutral solution as the [H+] and [OH-] is of same value ie,10-^7M

Answer:

vapor pressure, atmospheric pressure

Explanation:

the boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.

(I'm not too sure if this is right but I think it is)

Answer:

13

Explanation:

proton plus neutron equal to atomic mass

Answer:

B. Calculate the mass of iron produced from the reaction

Explanation:

Sana makatulong mark me as a brainliest

Answer:

i don't know the answer now please sorry for the day before the end of the following is Open you have a good time with the button in the top right of

Answer:

3*0.35L = 1.05L

Explanation:

For part A, we need the ratio of moles of propane to moles of oxygen to get the volume of oxygen required.

The equation tells us there are 5 moles of oxygen gas required to combust 1 mole of propane.

So the required volume of oxygen is 5*0.35L = 1.75L

The equation also tells us that 3 moles of carbon dioxide are produced from the combustion of one mole of propane.

Therefore the produced volume of carbon dioxide is 3*0.35L = 1.05L

Answer:

Initial velocity (u) = 0 m/s

Final velocity (v) = 60 m/s

Time (t) = 7 sec

Acceleration (a) = ?

a = (v-u)/t

a = (60-0)/7

a = 60/7

a = 8.57 m/s²

Answer:

A

Explanation:

True igneous rock forms cooling of magma fast on the top

Answer:

The answer is A. True

Explanation:

Answer:

34.429%

Explanation:

Answer:

It's a metaphor. It's comparing Jordan and their emotions to a tornado

Answer:

Explanation:

are you doing your mid term?well i got c

Answer:

D

Explanation:

Compounds 1 and 3 are lonic.Because ionic compounds are composed of oppositely charged ions that are attracted to one another,

they require more energy to melt than covalent bonds. just usign he process of elimination you get rid of A and B becuase covalant compound contaIN same negatively charged particles that contain requrie less energy to melt and since two and four have low melting point its d

Answer:

I believe that it would be copper because copper is all of those things.

Explanation:

Answer:55ml

Explanation:

Answer:

d. Because those chemicals are easily made when CO2 reacts with water, forming H2CO3 (via carbonic anhydrase

The pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻)  , Option D

A buffer is a  combination of a weak acid (or base) and a salt that contains the conjugate of that weak acid or base.

A buffer solution is added to maintain the pH of any solution

The buffer  of carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻)  is used to maintain the balance of acid and base in the body.

It is used to maintain the pH level of the body between 7.35 and 7.45 , as the pH level higher than 7.8 and lower than 6.8 can lead to death.

Therefore the pairs of substances form a buffer system for human blood is carbonic acid (H₂CO₃) and bicarbonate anion (HCO₃⁻)  , Option D

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