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Lorico [155]
3 years ago
11

A measurement has two parts a number and a

Chemistry
1 answer:
givi [52]3 years ago
5 0

Answer:perimiter

Explanation:

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How does carbon dioxide behave differently (its properties) as a gas compared with as a solid?
MaRussiya [10]
<span> is made up of a carbon atom covalently double bonded to two oxygen atoms. Carbon dioxide exists in Earth's atmosphere as a trace gas at a concentration of about 0.04 percent by volume.</span>
5 0
3 years ago
Write a balanced equation for the single-replacement oxidation-reduction reaction described, using the smallest possible integer
jeyben [28]

Answer:

\rm Cl_2 + 2\; KBr \to Br_2 + 2\; KCl.

One chlorine molecule reacts with two formula units of (aqueous) potassium bromide to produce one bromine molecule and two formula units of (aqueous) potassium chloride.

Explanation:

<h3>Formula for each of the species</h3>

Start by finding the formula for each of the compound.

  • Both chlorine \rm Cl and bromine \rm Br are group 17 elements (halogens.) Each
  • On the other hand, potassium \rm K is a group 1 element (alkaline metal.) Each

Therefore, the ratio between \rm K atoms and \rm Br atoms in potassium bromide is supposed to be one-to-one. That corresponds to the empirical formula \rm KBr. Similarly, the ratio between

The formula for chlorine gas is \rm Cl_2, while the formula for bromine gas is \rm Br_2.

<h3>Balanced equation for the reaction</h3>

Write down the equation using these chemical formulas.

\rm ?\; Cl_2 + ?\; KBr \to ?\;Br_2 + ?\; KCl.

Start by assuming that the coefficient of compound with the largest number of elements is one. In this particular equation, both \rm KBr and \rm KCl features two elements each.

Assume that the coefficient of \rm KCl is one. Hence:

\rm ?\; Cl_2 + 1 \; KBr \to ?\;Br_2 + ?\; KCl.

Note that \rm KBr is the only source of \rm K and \rm Br atoms among the reactants of this reaction.

There would thus be one \rm K atom and one \rm Br atom on the reactant side of the equation.

Because atoms are conserved in a chemical equation, there should be the same number of \rm K and \rm Br atoms on the product side of the equation.

In this reaction, \rm Br_2 is the only product with \rm Br atoms.

One \rm Br atom would correspond to 0.5 units of \rm Br_2.

Similarly, in this reaction, \rm KCl is the only product with \rm K atoms.

One \rm K atom would correspond to one formula unit of \rm KCl.

Hence:

\displaystyle \rm ?\; Cl_2 + 1 \; KBr \to \frac{1}{2}\;Br_2 + 1\; KCl.

Similarly, there should be exactly one \rm Cl atom on either side of this equation. The coefficient of \rm Cl_2 should thus be 0.5. Hence:

\displaystyle \rm \frac{1}{2}\; Cl_2 + 1 \; KBr \to \frac{1}{2}\;Br_2 + 1\; KCl.

That does not meet the requirements, because two of these coefficients are not integers. Multiply all these coefficients by two (the least common multiple- LCM- of these two denominators) to obtain:

\displaystyle \rm 1\; Cl_2 + 2 \; KBr \to 1\;Br_2 + 2\; KCl.

7 0
3 years ago
During the isothermal heat addition process of a Carnot cycle, 900 kJ of heat is added to the working fluid from a source at 400
Alinara [238K]

Answer:

the entropy change of the fluid during the process process is is 1.337 kJ/K, the change for the source is -1.337 kJ/K and the total entropy change is 0

Explanation:

since the Carnot cycle is a reversible cycle, the entropy change is related with the heat exchanged through:

ΔS =∫dQ/T

since the temperature remains constant

ΔS =∫dQ/T=(1/T)*∫dQ = Q/T

Q= heat added to the system

T= absolute temperature = 400°C= 673 K

therefore

ΔS = Q/T = 900 kJ/ 673 K = 1.337 kJ/K

ΔS working fluid = 1.337 kJ/K

since the process is reversible, the entropy change of the universe (total entropy change)  is 0 (there is no entropy generation). thus

ΔS universe = ΔS working fluid + ΔS source = 0

ΔS source= -ΔS working fluid = -1.337 kJ/K

7 0
2 years ago
Help me plzzzzz ASAP!!!!!
lianna [129]

Answer:

The first one is synthesis

3 0
2 years ago
The atoms of platinum and silver are identical (true or false)
koban [17]

Answer:

I think it's false but not sure

3 0
2 years ago
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