Why does the temperature of heated water change when you increase the volume?

Answers

Answer 1

Answer: By heating the water the temperature of 0C to 4C, one can observe a decrease in its volume. In this temperature range, there is the phenomenon of anomalous thermal expansion of water.
The volume of water in the range of 0C to 4C decreases and 4C to 100C from growing. This anomalous behavior of water is associated with the fact that liquid water a temperature slightly above 0C, there are remnants of the loose structure of the ice. The temperature increase destroys this structure, allowing denser packing of the molecules, and thus the volume of water decreases.

Answer 2

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Which of the following two elements will likely form a covalent bond? N and O K and Cl Li and F Na and Sr

Answers

Covalent bonds are also called molecular bonds. These chemical bondings involves atoms sharing electron pairs. Covalent bonding usually happen between 2 non-metals. Non metals are usually found in the left and right most sides of the periodic table. Hence, the answer will be A. N and O since both elements are non-metals.

Answer: N and O

Explanation:

An ionic bond is formed when a metal completely transfers its valence electron to a non metal.

Covalent bond is formed by sharing of electrons between two non metals.

A. N and O both are non metals and thus form a covalent bond.

B. K is a metal and Cl is a non metal and thus form an ionic bond.

C. Li is a metal and F is a non metal and thus form an ionic bond.

D. Na and Sr both are metals

Please help I cant figure this outformula is m(t) = Mo e^-rt
decay rate is r= ln2/h. Radium-221 has a half-life of 30 seconds. How long will it take for 90% of a sample to decay = o-rt

Answers

half life formula is t1/2 = ln2/lambda
Where lambda is the decay constant
Rewriting we get lambda = ln2 / t1/2
Subbing in 30 seconds as half life we get lambda= 0.0231049 approx.
I assume only mass of radium is what you want.
Hence he have the formula
m=mo e^-lambda x t
Where m is mass after time
Mo is initial mass.
For 90% to decay, m/mo x100% = 90%
Hence m/mo = 0.1 this is because 90% has decays so we are left with 10%
Rearranging, m=mo e^-lambda x t
We obtain
(m/mo)=e^-lambda x t
Subbing in above values we get,
0.1=e^-0.0231049 x t
Take ln on both sides to get
ln(0.1) = -0.0231049 x t
Hence,
t = ln(0.1) / (-0.0231049)
t= 99.65787 s
It takes about 100 seconds for 90% to decay

Which barium salt is insoluble in water?A) BaCO3. B) BaCl2
C) Ba(ClO4)2. D) Ba(NO3)2

Answers

$\boxed{{\text{A) BaC}}{{\text{O}}_{\text{3}}}}$ is insoluble in water.

Further Explanation:

Solubility rules

These help in predicting whether the given compound is soluble or insoluble in nature. Some of the solubility rules are as follows:

1. Group 1A compounds are soluble in nature.

2. All the common compounds of ammonium ion and all acetates, chlorides, nitrates, bromides, iodides, and perchlorates are soluble in nature. But the ions whose chlorides, bromides, and iodides are not soluble are ${\text{A}}{{\text{g}}^ + }$ , ${\text{P}}{{\text{b}}^(2 + )}$ , ${\text{C}}{{\text{u}}^ + }$ and ${\text{Hg}}_2^(2 + )$ .

3. All common fluorides, except for ${\text{Pb}}{{\text{F}}_{\text{2}}}$ and group 2A fluorides are soluble. Also, all sulfates except ${\text{CaS}}{{\text{O}}_{\text{4}}}$ , ${\text{SrS}}{{\text{O}}_{\text{4}}}$ , ${\text{BaS}}{{\text{O}}_{\text{4}}}$ , ${\text{A}}{{\text{g}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$ and ${\text{PbS}}{{\text{O}}_{\text{4}}}$ are soluble.

4. All common metal hydroxides except ${\text{Ca}}{\left( {{\text{OH}}} \right)_{\text{2}}}$ , ${\text{Sr}}{\left( {{\text{OH}}} \right)_{\text{2}}}$ , ${\text{Ba}}{\left( {{\text{OH}}} \right)_{\text{2}}}$ and hydroxides of group 1A and that of transition metals are insoluble in nature.

5. All carbonates are insoluble in nature, except for sodium, potassium and ammonium.

6. Salts having ions like $\text{Cl}^-$ , $\text{Br}^-$ or $\text{I}^-$ are generally soluble except those of $\text{Ag}^+$ , $\text{Pb}^(2+)$ and ${\left( {{\text{H}}{{\text{g}}_2}} \right)^{{\text{2 + }}}}$ .

7. Group 1A and group 2A perchlorates are soluble in nature.

8. All sulfates of metals are soluble, except for lead, mercury (I), barium, and calcium sulfates.

9. The salts having nitrate ions are soluble in nature.

According to the solubility rules, only carbonates of sodium, potassium and ammonium are soluble in nature. So barium carbonate $\left( {{\text{BaC}}{{\text{O}}_{\text{3}}}} \right)$ is insoluble in nature. But chlorides, nitrates and perchlorates of barium are soluble in water. Therefore option A is the correct answer.

Learn more:

Identify the precipitate in the reaction: brainly.com/question/8896163
What type of reaction occurs by mixing barium sulfide and sulfuric acid? brainly.com/question/5464325

Answer details:

Grade: Senior School

Chapter: Chemical reaction and equation

Subject: Chemistry

Keywords: barium, water, insoluble, solubility rules, soluble, insoluble, water, BaCO3.

BaCO₃ is generally considered insoluble in water. Carbonates are often insoluble, except for some alkali metals and ammonium carbonates. Therefore, option A is correct.

The solubility of salt depends on its nature and the interactions between its ions and water molecules. In this case, determine the solubility of each salt by considering the common solubility rules.

BaCl₂ is soluble in water. Chlorides (Cl-) are mostly soluble except for a few exceptions, such as silver chloride, lead chloride, and mercury(I) chloride.

Ba(ClO₄)₂ is soluble in water. Perchlorates (ClO4-) are typically soluble.

Ba(NO₃)₂ is soluble in water. Nitrates (NO3-) are mostly soluble.

Based on the solubility rules, the salt that is insoluble in water is BaCO₃ (barium carbonate).

To learn more about the solubility, follow the link:

brainly.com/question/28170449

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A group of students were discussing the lonization energies of Selenium and Flourine. Which student is correct for the reason why their element has the highest lonization energy? O A Student C says F because the larger the atom, the stronger the attraction between protons and valence electrons. The stronger the attraction the more energy is needed to remove a valence electron. B. Student B says Se because the smaller the atom, the stronger the attraction between protons and valence electrons. The stronger the attraction, the more energy is needed to remove a valence electron. C. Student D says F because the smaller the atom, the stronger the attraction between protons and valence electrons. The stronger the attraction, the more energy is needed to remove a valence electron. OD. Student A says Se because the larger the atom, the stronger the attraction between protons and valence electrons. The stronger the attraction the more energy is needed to remove a valence electron.

Answers

The correct student is Student D, who says that Fluorine (F) has the highest ionization energy because the smaller the atom, the stronger the attraction between protons and valence electrons.

The stronger the attraction, the more energy is needed to remove a valence electron.

Ionization energy refers to the energy required to remove an electron from an atom. Smaller atoms have a stronger attraction between the positively charged protons in the nucleus and the negatively charged electrons in the outermost energy level. As a result, it takes more energy to remove an electron from a smaller atom like fluorine. This is because the electrons are held more tightly due to the stronger attraction.

So, the reasoning provided by Student D correctly explains why Fluorine has the highest ionization energy among Selenium (Se) and Fluorine (F).

Learn more about ionization energy from the link given below.

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I think the Answer is C because Flourine is stronger in electron attraction and is smaller so it has a stronger electronic pull. Hope this helps :)

Pls help me on question 30 I don't know how to do it

Answers

The rate law for a reaction that is first order in both reactants is Rate=k[A][B]. Therefore to find the rate you plug in the values you are given to get the equation rate=0.5×0.0183×0.0168 to get Rate=1.54×10⁻⁴ mol/Ls.

I hope this helps. Let me know in the comments if anything is unclear.

The process of a material going through a change of state from a gas to a liquid is called

Answers

The process of a Material Going from a Gas to liquid is known as Condensation

this is condensation (like when steam turns to water on the sides of a hot drink)

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