When placed in water, ice rises to the top of the liquid. unlike most solids that sink when placed in their liquid forms, ice floats because -?

Answers

Answer 1

ice has a lower density than liquid water which is why it floats, it is also why water expands when it freezes.

Related Questions

how many liters of nitrogen gas are needed to make 25 mol of nitrogen trifluoride

Answers

The reaction between N₂ and F₂ gives Nitrogen trifluoride as the product. The balanced equation is;

N₂ + 3F₂ → 2NF₃

The stoichiometric ratio between N₂ and NF₃ is 1 : 2
Hence,
moles of N₂ / moles of F₂ = 1 / 2
moles of N₂ / 25 mol = 0.5
moles of N₂ = 0.5 x 25 mol = 12.5 mol

Hence N₂ moles needed = 12.5 mol

At STP (273 K and 1 atm) 1 mol of gas = 22.4 L

Hence needed N₂ volume = 22.4 L mol⁻¹ x 12.5 mol
= 280 L

Calculate the number of moles of naoh present in 11.2 ml of 2.50 m naoh solution

Answers

Let's review what is given in this problem.

The volume of the solution is 11.2 milliliters, which is 0.0112 liters (multiply 11.2 mL with 1 L / 1000 mL to get 0.0112).

The molar concentration is 2.5 M. This means that there are 2.5 moles of NaOH per liter in the solution.

Multiply the volume and the molar concentration to get the moles of NaOH in the solution.

[tex]\text{moles of NaOH} = 0.0112 \: \text{Liter} \times \dfrac{2.5 \: \text{moles}}{1 \: \text{Liter}}[/tex]

The "Liter" will cancel out, leaving only moles.
After using a calculator (or computing by hand), you should get the following value:

[tex]0.028 \: \text{moles}[/tex]

Since the given values were given with 3 significant figures, let's change this answer so there are 3 significant figures.

Thus, your final answer is [tex]0.0280 \: \text{moles}[/tex]

Answer:

0.028 moles

Explanation:

you'll never delete me !!

Which blood vessels have thick, muscular, and elastic walls? Veins Arterioles Capillaries Arteries

Answers

The answer is arteries

The correct answer would be Arteries

Draw the electron dot formula for the hypochlorite ion, clo-. how many nonbonding electron pairs are in a hypochlorite ion? 1 6 7 2 none of the above

Answers

Answer:
There are 6 nonbonding electron pairs are in a hypochlorite ion.

Explanation:
Lewis structure of ClO⁻ is drawn as,

1) Add valence electrons of both elements along with additional one electron present in the form of negative charge on molecular ion, so,

Valence e⁻ of Cl = 7

Valence e⁻ of O = 6

e⁻ for negative charge = 1
------------
Total e⁻ 14

2) Draw both elements and connect them by single bond, and subtract 2 electrons from total valence electrons,
So,
14 - 2 = 12

Now distribute remaining 12 electrons on both element in order to complete their octet.

Result:
Each element gets three lone pair of electrons which are not involed in bonding. Therefore, overall 6 nonbonding electron pairs are present on ClO⁻ ion.

If the partial pressure of carbon dioxide gas in a blood capillary is 45 mm hg, what is the pressure expressed in inches of mercury? 0.059 in. hg 1.8 in. hg 4.5 in. hg 1,100 in. hg 0.87 in. hg

Answers

both inches of mercury and milimeters of mercury are units used to measure pressure .
in. Hg - inches of mercury
mm Hg - millimetres of mercury
1 mm Hg is equivalent to 0.0394 in. Hg
therefore 45 mm Hg is equal to 0.0394 in.Hg/mm Hg x 45 mm Hg = 1.8 in. Hg

correct answer is B - 1.8 in. hg

describe the difference between a monoprotic acid and a triprotic acid. How does a triprotic acid generate hydrogen ions?

Answers

With the Bronsted-Lowry theory of acids and bases, acids donate protons to other substances. A monoprotic acid is an an acid that can only supply one proton (hydrogen). A triprotic acid is an an acid that can supply up to three protons (hydrogens). A triprotic acid get get its hydrogen ions by receiving them from a base.

Final answer:

Monoprotic acids contain one ionizable hydrogen atom, while triprotic acids contain three ionizable hydrogen atoms. Triprotic acids, like phosphoric acid, generate hydrogen ions through stepwise ionization reactions.

Explanation:

A monoprotic acid is an acid that contains only one ionizable hydrogen. Examples of monoprotic acids include hydrochloric acid (HCl) and acetic acid (CH3COOH). On the other hand, a triprotic acid is an acid that contains three ionizable hydrogens. An example of a triprotic acid is phosphoric acid (H3PO4).

When a triprotic acid like phosphoric acid dissociates, it releases hydrogen ions (H+) in a stepwise manner. The acid goes through a series of ionization reactions, each removing one proton. For example, phosphoric acid first donates one hydrogen ion (H+) to form dihydrogen phosphate ion (H2PO4-), then donates a second hydrogen ion to form hydrogen phosphate ion (HPO42-), and finally donates the third hydrogen ion to form phosphate ion (PO43-).

If the number of moles of a gas initially contained in a 2.10 l vessel is doubled, what is the final volume of the gas in liters? (assume the pressure and temperature remain constant.) none of the above 8.40 4.20 1.05 6.30

Answers

Final answer:

According to Avogadro's Law, which assumes temperature and pressure to be constant, the volume of gas is directly proportional to the number of moles of gas. So, if the number of moles is doubled from an initial volume of 2.10L, the final volume will be 4.20L.

Explanation:

The initial query asked: If the number of moles of a gas initially contained in a 2.10L vessel is doubled, what is the final volume of the gas in liters? The answer lies within Avogadro's Law which states that there is a direct relationship between the amount of gas (in moles) and its volume, assuming that temperature and pressure are held constant. Therefore, if you double the moles of gas, you should also double the volume. Hence, if we double the initial 2.10L, we will end up with a final volume of 4.20L.

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Which law tells us the number of atoms of each element must be the same on both sides of a chemical equation?

Answers

I think the law in question here is the law of conservation of mass. All chemical equations have to adhere to the law of conservation of mass, that states that matter cannot be created or destroyed; thus, there must be the same number of atoms of each element on each side (right and the left side)of the chemical equation.

Consider the rate below
R=K(L)^2(XY)
What is the overall order of the reactants in this reaction? 0 1 2 3

Answers

The Order of Reaction is defined as, "the sum of the exponents of the concentration terms in the rate expression of the reaction".
The rate expression given is,

Rate = k [L]² [XY]
So,
The sum of exponents is,
2 + 1 = 3

It is a third order reaction, provided it is second order with respect to concentration of L and first order with respect to concentration of XY.

Result:
It is 3rd Order Reaction.

Calcite (the main mineral in limestone) is made of calcium carbonate (CaCO3). Dolomite, a related mineral, is made of magnesium carbonate (MgCO3). What happens if a geologist drips a small amount of vinegar (acetic acid) onto a sample of dolomite?

Answers

Answer: CO₂ will be formed, with the consequent fizzing effect.

Explanation:

1) Look at the chemical reaction that happens between magnesiumm carbonate and vinegard

MgCO₃(aq) + CH₃COOH(l) → CO₂ (g) + MgCOOH(aq) (it is not balance as it is only to show the products formed not to make calculations).

2) Then you see that CO₂ is evolving in the form of gas. That will cause the formation of bubbles (fizzing).

Dolomite is an anhydrous magnesium carbonate mineral that reacts with acetic acid (vinegar) to produce fizzing because of the carbon dioxide gas produced.

What is effervescence?

Effervescence is a fizz or release of bubbles of gases when it reacts with another substance. Carbon dioxide is released with a fizzing effect.

The reaction between dolomite and vinegar is shown as:

[tex]\rm MgCO_{3}(aq) + 2 CH_{3}COOH(l) \rightarrow CO_{2} (g) + H_{2}O + Mg(CH_{3}COO)_{2}[/tex]

From the reaction, it can be said that the release of carbon dioxide results in effervescence or fizz.

Therefore, a drop of acetic acid on dolomite results in effervescence.

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Atoms that have a positive or negative electrical charge are called ________.

A. magnetic
B. isotopes
C. metals
D. ions

Answers

ions are atom with positive and negative electrical charge

Answer: ions

Explanation:

NEED ASAP
Analyze the shape of H2O.
What is the shape of the H2O molecule?
Is it symmetrical?
Does this mean that the H2O molecule is polar or nonpolar?

Answers

Answer:

The answers are in the explanation.

Explanation:

Analyze the form of H2O: The water molecule is composed of an oxygen atom, linked to two hydrogen atoms. The oxygen atom shares one pair of electrons with each hydrogen atom, leaving two pairs of free electrons in the oxygen without sharing.

What is the shape of the H2O molecule? The pairs of unshared electrons exert a repulsion, so the molecule acquires the angular shape.

Is it symmetrical? The H2O molecule is asymmetric due to free electron pairs.

Does this mean that the H2O molecule is polar or non-polar? Does this mean that the molecule is polar, as the uneven distribution of electrons gives it a slightly negative charge near the oxygen atom and a slightly positive charge near the hydrogen atoms.

Have a nice day!

The H2O molecule looks like a bent or V-shaped. This is made up of two hydrogen atoms connected to a middle oxygen atom.

The H2O molecule is not symmetrical due to the lone pairs on the central oxygen atom.

The H2O molecule is polar due to the bent shape and unequal distribution of electron density.

What is the shape of the H2O molecule?

This arrangement makes the molecule have a curved shape. The H-O-H bond is polar because the oxygen and hydrogen have different attraction strengths.

However, the bent shape of the molecule creates an overall polarity. In water (H2O), the oxygen atom has a stronger pull on the shared electrons compared to the hydrogen atoms. This makes the oxygen atom attract the electrons closer to itself. As a result, one end of the molecule has a little bit more negative charge, while the other ends have a little bit more positive charges.

Answers

Answer:

Cellular respiration

Explanation:

Oxygen is required by the cell in the Krebs cycle as the ultimate proton acceptor (creating water an end product during making out ATPs). During the conversion of pyruvate from glycolysis to Acetyl-CoA that enters the Krebs cycle, the pyruvate is decarboxylated (or oxidized) hence creating carbon IV oxide as a byproduct.

For each pair of gases, select the one that most likely has the highest rate of effusion. Use the periodic table if necessary.

Answers

Answer:

Hydrogen

Methane

Ammonia

Fluorine

Explanation:

Edge 2023

How many unshared pairs of electrons does the nitrogen atom in ammonia possess?

Answers

In order to find the number of unshared electrons present on N atom in Ammonia (NH₃), we will first draw the lewis structure of Ammonia.

Step 1: Calculate number of Total valence Electrons:

# of Valence e⁻s in N = 5

# of Valence e⁻s in H₁ = 1

# of Valence e⁻s in H₂ = 1

# of Valence e⁻s in H₃ = 1
---------------
Total Valence e⁻s = 8

Step 2: Start drawing the structure:

Draw Central atom (N) in center surrounded by three H atoms. Connect N with each H atom through single bond and subtract e elctrons from total valence electrons for each single bon. Therefore, for three single bonds, 6 electrons are subtracted. i.e.

= 8 - 6

= 2

These two electrons left are added to N atom as a lone pair of electron.

Result:
Nitrogen atom in Ammonia possess 2 (two) unshared electrons marked as red in given picture.

The nitrogen atom in an ammonia molecule has one lone pair of electrons.

The nitrogen atom in an ammonia molecule (NH₃) has five valence electrons. According to its Lewis structure, nitrogen forms three covalent bonds with three hydrogen atoms. Each hydrogen atom donates one electron, filling its valence shell.

Nitrogen uses three of its five valence electrons in these bonds, resulting in three bonding pairs shared between nitrogen and hydrogen. The remaining two valence electrons on the nitrogen atom do not participate in bonding and are thus termed an unshared pair or a lone pair.

Therefore, the nitrogen atom in ammonia possesses one lone pair of electrons.

A 34.53 ml sample of a solution of sulfuric acid, h2s04, reacts with 27.86 ml of 0.08964 m naoh solution. calculate the molarity of the sulfuric acid solution

Answers

Final answer:

The molarity of the sulfuric acid solution is calculated by first determining the moles of NaOH used in the titration, then finding the corresponding moles of H2SO4 using the 1:2 mole ratio from the balanced equation, and finally, dividing the moles of H2SO4 by its volume in liters.

Explanation:

To calculate the molarity of the sulfuric acid solution, we need to follow these steps:

Write down the balanced chemical equation for the reaction: H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) + 2H2O (l).

Calculate the moles of NaOH used in the titration. Since the molarity of NaOH is given as 0.08964 M and the volume used is 27.86 mL, the moles of NaOH is (0.08964 M)(0.02786 L) = 0.002496 moles.

From the balanced equation it's evident that the mole ratio of H2SO4 to NaOH is 1:2, thus the moles of H2SO4 will be half the moles of NaOH, which is 0.002496 / 2 = 0.001248 moles.

Finally, divide the moles of H2SO4 by the volume of the sulfuric acid solution in liters to get the molarity of the solution. Therefore, molarity = 0.001248 moles / 0.03453 L = 0.03612 M.

which element is in the same "family" as chlorine (Cl) and fluorine (F)?
a. bromine (Br)
b. oxygen (o)
c. hydrogen (h)
d. lithium (Li)

Answers

Answer: [A]: "bromine (Br)" .
__________________________________________________
Note: "bromine" (Br) ; "chlorine" (Cl) ; and "fluorine" belong in the "halogen" family.
___________________________________________________Refer to the Period Table of Elements (shown below).

The vertical "columns" are referred to as: "groups"; or, "families". Refer to the "halogens"; or "halogen family" — circled in "black-color"; as follows:___________________________________________________

Bromine (Br) is in the same halogen family as chlorine (Cl) and fluorine (F) because they share similar chemical properties and have the same number of valence electrons. Option A is correct .

The element that is in the same 'family' as chlorine (Cl) and fluorine (F) is bromine (Br). These elements are part of the halogen family in the periodic table. Halogens are found in Group 17, and they share similar chemical properties, such as high reactivity and the tendency to form salts with metals.

For clarification, elements in the same group or family have the same number of valence electrons, which contributes to their similar chemical behavior. Bromine, like chlorine and fluorine, has seven valence electrons and forms similar types of compounds.

Oxygen (O), hydrogen (H), and lithium (Li) belong to different families: oxygen is a chalcogen, hydrogen is often placed in its own group due to its unique properties, and lithium is an alkali metal. Option A is correct .

How many mililiters of .75% sugar solution must be added to 100 ml of 1.5% sugar solution to form a 1.25% sugar solution?

Answers

you have to add 50 mL of 0.75% to 100 mL of 1.5% to get 150 mL of 1.25% of sugar solution.

What determines the strength of an arrhenius base? give one example each of an aqueous solution of a strong base and an aqueous solution of a weak base?

Answers

The strength of an Arrhenius base determines percentage of ionization of base and the number of OH⁻ ions formed.
Strong base completely ionize in water and gives a lot of hydroxide ions (OH⁻), for example sodium hydroxide: NaOH(aq) → Na⁺(aq) + OH⁻(aq).
Weak base partially ionize in water and gives a few hydroxide ions (OH⁻), for example ammonia: NH₃ + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq).

Final answer:

The strength of an Arrhenius base is determined by its ability to form hydroxide ions in solution, with strong bases fully dissociating and weak bases partially dissociating. Sodium hydroxide (NaOH) is a strong base that dissociates completely, while ammonia (NH3) is a weak base that only partially dissociates.

Explanation:

The strength of an Arrhenius base is determined by its tendency to form hydroxide ions (OH-) in an aqueous solution. This process is described by the reaction B(aq) + H2O(l) ⇒ HB+(aq) + OH-(aq), where B stands for the base and HB+ is its conjugate acid after accepting a proton from water. Strong bases completely dissociate in water, releasing a large amount of hydroxide ions, whereas weak bases only partially dissociate, resulting in a smaller amount of hydroxide ions.

An example of a strong base in aqueous solution is sodium hydroxide (NaOH), which fully dissociates to form Na+ and OH-. An example of a weak base is ammonia (NH3), which only partially dissociates in water, forming ammonium (NH4+) and hydroxide ions.

The relative strength of a base can also be quantified by its base-ionization constant (Kb). A larger Kb value indicates a stronger base, which means a higher concentration of hydroxide ions is produced in solution.

A hiker has packed a bag of chips as a snack. At the start of the hike the pressure was 1.5 atm and the temperature was 35*C. At the end of the hike the temperature has dropped to a 0.5*C. What is the pressure at the end of the hike? What would you expect to happen to the bag of chips?

Answers

According to Gay-Lussac's Law the temperature and Pressure are directly proportional to each other if the amount and volume of given gas are kept constant.
Mathematically for initial and final states it is expressed as,

P₁ / T₁ = P₂ / T₂ ----- (1)
Data Given;
P₁ = 1.5 atm

T₁ = 35 °C + 273 = 308 K

P₂ = ?

T₂ = 0 °C + 273 = 273 K

Solving Eq. 1 for P₂,

P₂ = P₁ T₂ / T₁

Putting values,
P₂ = (1.5 atm × 273 K) ÷ 308 K

P₂ = 1.32 atm
Result:
As the temperature is decreased so the pressure also decreases from 1.5 atm to 1.32 atm. Therefore the bag will contract.

If less than 1% of ethanoic acid is ionized in an instant, ethanoic acid is considered a __________ acid. hydrochloric weak strong sulfuric

Answers

If less than 1% of ethanoic acid is ionized in an instant, ethanoic acid is considered a weak acid.
Ethanoic (acetic) acid ionization: CH₃COOH(aq) ⇄ CH₃COO⁻(aq) + H⁺(aq).
In water ethanoic acid is mainly in CH₃COOH form, only 1% in CH₃COOH and H⁺ ions, because it gives little hydrogen ions, this acid is considered weak monoprotic acid.
In aqueous solution, acetic acid has a pKa value of 4.76.

A rock contains uranium 238 which has a half life of 4.5 billion years. if the rock is crushed and heated, the half life in urainium-238 will

Answers

The answer is remain the same.If the rock is cut, crushed, or heated, the length of the half life of the uranium would remain the same since these factors have no effect on half-life.Even though chemical changes were affected by temperature, the physical state, pressure, concentration, the chemical environment within the molecule, and any other changing factors, the half-life of a radioactive substance is independent of these influences.

Crushing and heating a rock containing uranium-238 does not change its half-life, which remains 4.5 billion years.

The half-life of a radioactive isotope like uranium-238 is the time it takes for half of its atoms to decay into another element.

For uranium-238, this duration is 4.5 billion years.If a rock containing uranium-238 is crushed and heated, the half-life of the uranium-238 will remain the same.This is because the half-life is a fundamental property of the radioactive nucleus and is not affected by external conditions like crushing or heating.

To summarize, the process of crushing and heating the rock does not alter the radioactive decay process or the half-life of uranium-238, which will remain constant at 4.5 billion years.

You need a 45% alcohol solution. on hand, you have a 480 ml of a 40% alcohol mixture. you also have 85% alcohol mixture. how much of the 85% mixture will you need to add to obtain the desired solution?

Answers

x ml of 85% mixture will needed to add

0.40*480 ml alcohol in 480 ml solution (40%)
0.85x alcohol in x ml solution (85%)

0.45(480 + x) in (480 + x)ml 0.45% solution

0.40*480+0.85x =0.45(480 + x)
192+0.85x=216+0.45x
0.85x-0.45x=216-192
0.4x=24
x=24/0.4=60 ml a 45% alcohol solution

Which is a characteristic of unsaturated fats?

A_They come from plant steroids.

B_They make up most animal fats.

C_They are liquids at room temperature.

D_They easily stack on top of each other.

Answers

Answer is C. They are liquids at room temperature.

Saturated fats are solid at room temperature, while unsaturated fats are liquid at room temperature.

Which carbohydrate provides energy for cows but only dietary fiber for humans?

A-cellulose

B-starch

C-glycogen

D-sucrose

Answers

The answer would be,
A - Cellulose
Take care ^-^

starch serves energy for cows and diets withhold many starches

Fluid in the semicircular canals stimulates impulses to the brain to maintain balance t or f

Answers

The answer is True. Fluid in the semicircular canals stimulates impulses to the brain to maintain balance. If the semicircular canals are damaged, the balance sense will be affected.

Which formula shown is incorrect for the name given? Which formula shown is incorrect for the name given? calcium nitrate: Ca(NO3)2 ammonium cyanide: NH4CN strontium carbonate: SrCO3 potassium acetate: KC2H3O2 lithium sulfate: LiSO4

Answers

Answer:

5.Lithium sulfate:[tex]LiSO_4[/tex]

Explanation:

We have to find the formula which is incorrect for the name given

1.Calcium nitrate :[tex]Ca(NO_3)_2[/tex]

We know that Charge on calcium ion =+2

Charge on nitrate ion=-1

Therefore, the formula of calcium nitrate is [tex]Ca(NO_3)_2[/tex].

Hence, it is true.

2.Ammonium cyanide:[tex]NH_4CN[/tex]

Charge on ammonium ion=+1

Charge on cyanide ion=-1

Therefore, the formula of ammonium cyanide is [tex]NH_4CN[/tex].

Hence, it is true.

3.Strontium carbonate :[tex]SrCO_3[/tex]

Charge on strontium ion=+2

Charge on carbonate ion=-2

Therefore, the formula of strontium carbonate is [tex]SrCO_3[/tex].

Hence, option is true.

4.Potassium acetate:[tex]KC_2H_3O_2[/tex]

Charge on potassium ion=+1

Charge on acetate ion=-1

Therefore , the formula of potassium acetate is [tex]KC_2H_3O_2[/tex].

Hence, option is true.

5.Lithium sulfate:[tex]LiSO_4[/tex]

Charge on lithium ion=+1

Charge on sulfate ion=-2

Therefore, the formula of lithium sulfate is [tex]Li_2SO_4[/tex].

But given formula is [tex]LiSO_4[/tex].

Hence, option is false.

NEED HELP FAST, THANKS!
What is the distance between two consecutive troughs called? A. period length B. trough length C. amplitude length D. wavelength

Answers

Wavelength is the distance between two consecutive troughs.

Which or the following solutions would have the highest concentration of hydronium ion and why?
A)1.0×10^-3 M HCl
B)1.0×10^-3 M HC2 H3 O2
C)0.050 M HCl
D)0.050 M HC2 H3 O2

(I already know that the answer is C I just don't know why)

Answers

Answer is: C)0.050 M HCl.
Chemical reaction 1: HCl(aq) + H₂O(l) → H₃O⁺(aq) + Cl⁻(aq).
Chemical reaction 2: CH₃COOH(aq) + H₂O(l) ⇄ H₃O⁺(aq) + CH₃COO⁻(aq).
Hydrochloric acid (HCl) is strong acid, which means that concencentration of hydronium ions are equal as concentration of hydrochloric acid:
A) c(HCl) = c(H₃O⁺) = 0.001 M.
C) c(HCl) = c(H₃O⁺) = 0.050 M is greater than A.
Acetic acid (CH₃COOH) is weak acid and does not dissociate completely as HCl, so concentration of hydronium ion in this solutions are very low.

If 65.1L of N2(g) is needed to properly inflate an airbag, how many grams of NaN3(s) are needed for the reaction

Answers

The equation for this reaction is as follow,

2 NaN₂ (s) → 2 Na (s) + 3 N₂ (g)

According to equation,

67.2 L N₂ (3 moles) is produced by = 102 g (2 moles) NaN₂
So,
65.1 L N₂ will be produced by = X g of NaN₂

Solving for X,
X = (102 g × 65.1 L) ÷ 67.2

X = 98.81 g of NaN₂

Result:
98.81 g of NaN₂ is required to produce 65.1 L N₂ to inflate airbag.

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