Step 3: Measure Solubility in Cold Water

10
0
-10


80
100 m
60
-40
20

Temperature of the water to the nearest degree:

ANSWER IS 2°C. !!!

Answer:

Purple flowers are dominant

Explanation:

B is the answer ,ammonium accepts a proton and becomes ammonium ion

Answer:

The reaction of an acid and a base is called a neutralization reaction. ... However, in the reaction between HCl(aq) and Mg(OH) 2(aq), additional molecules of HCl and ... First, we will write the chemical equation with the formulas of the reactants ... The chloride ions are the only spectator ions  I THINKS

Explanation:

Answer:

a) 600 J

b) 75 W

Explanation:

Force= 400 N, distance = 150 cm = 1.5 m, time= 8s

a) Work is the product of force acting on an object and distance (or displacement). The S.I unit of work is the joules.

Work = force × distance = 400 × 1.5 = 600 J

b) Power is the amount of energy transferred per unit time. It is the ratio of work to time. The S.I unit of power is watt

Power = work/time = 600 / 8 = 75 W

Answer:

All the pure substances are made up of atoms and group of atoms known as molecules. They also have weight, volume and colour white solids also have the shape and hardness or texture. Pure substances also have points at which they boil and solidify.

Answer:

Pure substances are defined as substances that are made of only one type of atom or molecule. The purity of a substance is the measure of the extent to which a given substance is pure.

Explanation:

Answer:

Ok so the first step is glycolysis(which involves 10 different 'steps') which is conducted in the cytosol, so this is where  glucose breaks down  into two molecules of pyruvate.

The breakdown of glucose releases energy which changes ADP to ATP and NAD+ to  NADH.

The second step is commonly known as the Krebs Cycle or Citric Acid Cycle(involves 11 steps). This is where pyruvate is broken down into 3CO2.

The breakdown of pyruvate releases energy which changes ADP to ATP,  NAD+ to NADH and FAD+ to FADH2  

The third step is known as oxidative phosphorylation, this is where energy from NADH and FADH2  is used to generate a H+ gradient, which changes ADP to ATP.

Answer:

Glycolysis, Citric Acid Cycle, and the Electron Transport Chain  

Explanation:

Cellular respiration is the process in which cells break down glucose and release the stored energy to make ATP.

Step 1 — Glycolysis

Glycolysis is the conversion of glucose — a C₆ molecule — into two C₃ (pyruvate) fragments.

Step 1a. The linking reaction — pyruvate oxidation  

In preparation for the second step, each pyruvate ion loses a carbon atom as CO₂ and forms a two-carbon acetyl group.

The acetyl group is transferred to Coenzyme A to produce acetyl CoA.

Step 2 — the Citric Acid Cycle (CAC)

The acetyl CoA enters the CAC.

In various redox reactions, the C atoms in the acetyl group are oxidized to CO₂.

The electrons are passed to energy-storing molecules like NADH and FADH₂.

3. Step 3 — the Electron Transport Chain (ETC)

The NADH and FADH₂ pass their electrons to the Electron Transport Chain

In a series of redox reactions, the electrons reduce oxygen to water.

The energy released converts ADP to ATP (oxidative phosphorylation)

The whole purpose of respiration is to oxidize glucose to CO₂ and water and use the energy produced to form ATP.

One molecule of glucose produces 2 ATP in glycolysis, 2 in the CAC, and 34 in the ETC.

Answer:

The new volume is 1,000ml

Explanation:

Mathematically, we know that the number of moles per ml(volume) should be constant irrespective of the increase.

Initially, we have a volume of 500 ml and number of moles of 2.5 moles

The ratio of the number of moles to the volume is 2.5/500 = 0.005 mole/ml

Now, this is expected to remain the same even if we have an increment.

let’s call the new volume x

0.005 mol/ml = 5 moles/x ml

x = 5/0.005 = 1,000 ml

Answer:

B. CH₅N

Explanation:

The combustion reaction of a compound CₐHₓNₙ with O₂ is:

CₐHₓNₙ + O₂ → a CO₂ + X/2 H₂O + n NO₂

Where 1 mole of CₐHₓNₙ with an excess of O₂ produce a moles of CO₂, X/2 moles of H₂O and n moles of NO₂

Thus, you need to convert the mass of CO₂ and H₂O to moles to find the C:H ratio and determine a possible empirical formula thus:

Moles CO₂ (Molar mass 44g/mol):

44g ₓ (1mol / 44g) = 1 mole CO₂ = 1 mole C

Mole of H₂O (Molar mass 18g/mol):

45g ₓ (1 mol / 18g) = 2.5 moles H₂O = 5 moles H

Thus, in the compound you have 5 moles of H per mole of C, and a possible empirical formula is:

The only structure that meet this C:H ratio

The most likely empirical formula for the one that exemplifies a specimen of the compound containing the element C, H, and N which are completely combusted in oxygen to generate 44g Co2, 45g of H2O, and a little NO2 would be:

B). CH₅N

The reaction of combustion taking place in the compound CₐHₓNₙ using [tex]O_{2}[/tex] (oxygen) would be:

[tex]C_{a} H_{x} N_{n} + O_{2}[/tex]  → [tex]aCO_{2} + X/2 H_{2}O + nNO_{2}[/tex]

In this reaction, 1 mole belonging to [tex]C_{a} H_{x} N_{a}[/tex] having additional [tex]O_{2}[/tex] (oxygen) leads to generating '[tex]a[/tex]' moles of [tex]CO_{2}[/tex] (Carbon dioxide), [tex]X/2[/tex] number of moles of [tex]H_{2}O[/tex](Hydrogen), and n amount of moles of Nitrogen([tex]N[/tex]).

Therefore, it will be required to transform the mass of [tex]CO_{2}[/tex] and [tex]H_{2}O[/tex]  in the form of moles to deduce the ratio C:H to look for the likely empirical formula.

 [tex]CO_{2}[/tex] Moles                                                       (∵ Molar mass [tex]= 44g/mol)[/tex]

= [tex]44g[/tex] × [tex](1mol/44g)[/tex]

[tex]= 1 mole[/tex] of  [tex]CO_{2}[/tex]

[tex]= 1 mole[/tex] of C

[tex]H_{2}O[/tex] Moles                                                   (∵ Molar mass =[tex]18g/mol)[/tex]

[tex]= 45g[/tex] ₓ [tex](1 mol / 18g)[/tex]                          

[tex]= 2.5 moles[/tex]  [tex]H_{2}O[/tex]

[tex]= 5[/tex] [tex]moles of H[/tex] because (H * 2)

∵ The C:H ratio is 1:5 implying that formula would include 5 H moles and 1 C mole. So, CH₅N is the correct option.

Thus, option B is the correct answer.

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Answer:

Sodium (Na) — Will lose electrons

Silicon (Si) — Will lose electrons

Argon (Ar) — No reaction

Hope this helps.

Answer:

Explanation:

The higher the melting point of a substance, then the higher the force of attraction. Which means there is direct relationship between the melting point and force of attraction.

The increasing order of interparticle force of attraction of the the three particles are

Z(398) Y(314) X (298)

I.e Particle " Z " have highest melting point, follows by particle "Y" follows by particle "X

NOTE: The melting point of a substance refers to the

temperature whereby there there is a change from solid state to liquid state, it is dependent on the pressure of the system

Respiration occurs in the mitochondria

Answer:

mitochondria

Explanation:

Respiration happens in the cells of plants, animals and humans, mainly inside mitochondria.

Answer:

Titrations. Because a noticeable pH change occurs near the equivalence point of acid-base titrations, an indicator can be used to signal the end of a titration. When selecting an indicator for acid-base titrations, choose an indicator whose pH range falls within the pH change of the reaction.

Hope it helped!!

Answer:

Milk of Magnesia would consume the most stomach acid at almost 3 times the amount as baking soda.

Explanation:

Baking Soda = NaHCO3(s)+HCl(aq)=H20(l)+CO2(g)

NaHCO3 Molar mass of 84.007 g/mol

0.012 Moles of NaHCO3 and since an equal ratio of HCl is required

we therefore neutralize 0.012 Moles of HCl

Milk of magnesia = Mg(OH)2(s)+2HCl(aq)=2H20(l)+MgCl2(aq)

Mg(OH)2(s) Molar mass: 58.3197 g/mol

0.017 Moles of Mg(OH)2 and the ratio is 2:1, so 2 moles for each 1 mole of Mg(OH)2, so we need 0.034 Moles of HCl

Answer:

the carbon monoxide will release blue fumes

Answer: Thus [tex]CH_3CH(OH)CH_3[/tex] is a secondary alkanol.

Explanation:

Alkanol are compounds which contains carbons bonded by single bonds and contains hydroxy (-OH) as functional group.

Primary alkanol are those compounds which contain hydroxyl group attached a carbon which is further attached to a single carbon atom. Example: [tex]CH_3CH_2CH_2OH[/tex] and [tex]CH_3CH_2CH_2CH_2OH[/tex]

Secondary alkanol are those compounds which contain hydroxyl group attached to a carbon which is further attached to two more carbon atoms.Example: [tex]CH_3CH(OH)CH_3[/tex]

Tertiary alkanol are those compounds which contain hydroxyl group attached to a carbon which is further attached to three more carbon atoms. Example: [tex]C(CH_3)_3OH[/tex]

Thus [tex]CH_3CH(OH)CH_3[/tex] is a secondary alkanol.

Answer:

a) 64.27%

b) 58%

c) ethanol is the limiting reactant

d) ethanol is the limiting reactant

Explanation:

We have to note that the expected yield is the theoretical yield while the actual mass or amount of product formed is the actual yield.

a) theoretical yield=68.3g

Actual yield= 43.9 g

Percentage yield= 43.9/68.3 ×100

Percentage yield= 64.27%

b) theoretical yield= 0.0722 moles

Actual yield = 0.0419

Percentage yield= 0.0419/0.0722 × 100

Percentage yield= 58%

c) note that the limiting reactant yields the least number of moles of product

Ethanol will be the limiting reactant since it is not present in excess.

d) from the reaction equation;

1 mole of acetic acid produces 1 mole of ethyl acetate

0.58 moles of ethanol produces 0.58 moles of ethyl acetate

1 mole of acetic acid yields 1 mole of ethyl acetate

Hence 0.82 moles of acetic acid yields 0.82 moles of ethyl acetate

Hence ethanol is the limiting reactant.

Answer:

copper cathodes are normally referred to when talking about copper. Cathode is the purest form of copper and is the feedstock used to produce copper wire, cable, sheet, strip, tube, etc.

Explanation:

Answer:

255.5cm³

Explanation:

A solution that is 38.08 % by weight has 38.08g of sulfuric acid per 100g of total solution. Thus, mass of solution you need to obtain 125g is:

125g H₂SO₄ × (100g solution / 38.08g H₂SO₄) = 328.3g of solution

As density of the solution is 1.285g / cm³, the volume of 328.3g is:

328.3g × (1cm³ / 1.285g) = 255.5cm³

Answer:

Because electronegativity of Oxygen is higher than electronegativity of Carbon.

Explanation:

The electrons in a bond between carbon and oxygen, C-O, closer to the oxygen atom than the carbon atom because electronegativity of Oxygen is higher than electronegativity of Carbon.

Answer:

c

Explanation:

the mitochodria is the protien power house of the cell

Answer:

A) H2O2

Explanation:

Hydrogen peroxide is written as H2O2, which is the chemical formula of the compound, but this can be simplified. Since both H and O have the subscript of 2, they can be simplified to 1, so the empirical formula for H2O2 would be just H and O together (Brainly won't let me say the empirical form because it has the same spelling as a swear word). Thus, the empirical formula and chemical formula are different.

In the case of the other options, they are all in their simplest form and cannot be simplified further, so they are already in their empirical form, so both the chemical form and empirical form are the same.

In order to determine the amount of water that evaporates from we need to convert the mass into volume.

The builders and the density use the plaster of Paris called POP and are a CaSO4 x 1/2 H2O is used for the airtight containers to stop them from taking in water vapors from the air and changes into gypsum that is  CaSO4 x 2H2O. The answer is given as below. Answer:

The plaster of Paris is used for coating the walls and the celling from the aspects of molding. Its also used for casting decorative elements.

It absorbs water from the air and vapor evolves when the 2.00 kg of gypsum is heated at 110 degrees. C.

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Answer: 30.06% is your answer.

I hope this helps.

Stay safe and have a good day :D

Answer:

they stick together as a group and that they berly fought or argue

Answer:first get a jar

Explanation:

Patrick that’s a jokers side special

Answer: Aluminum Carbonate

Explanation:

Answer:

Aluminum carbonate.

Explanation:

It is an aluminum salt form of carbonic acid.

Answer: to find a cure for the common cold to produce insulin for diabetics

Explanation: It has helped many people

Answer: 204 L

Explanation:

According to ideal gas equation:

[tex]PV=nRT[/tex]

P = pressure of gas = 0.262 atm

V = Volume of gas = ?

n = number of moles = [tex]\frac{\text {given mass}}{\text {molar mass}}=\frac{11.7g}{4g/mol}=2.92[/tex]

R = gas constant =[tex]0.0821Latm/Kmol[/tex]

T =temperature =[tex]-50^0C=(273+(-50))K=223K[/tex]

[tex]V=\frac{nRT}{P}[/tex]

[tex]V=\frac{2.92\times 0.0820 L atm/K mol\times 223K}{0.262atm}=204L[/tex]

Thus volume occupied by 11.7 g of Helium in a balloon is 204L

Answer:

no

Explanation:

it only shows the atomic number and basically the chemical behavior of the element

Answer:

2

Explanation:

The compound H2CCH2 has the condensed formula C2H4. The name of the compound is ethene. The compound is unsaturated, that is, it contains multiple bonds. The compound has a formula which fits into the general molecular formulae of alkenes (olefins) which his CnH2n.

Olefins have a double bonds between the carbon atoms. That is , the two carbon atoms in Olefins are connected via a double covalent bond. This now implies that the two carbon atoms in ethene (C2H4) are connected by two covalent bonds in the lewis structure of the molecule as is common for Olefins.

In the Lewis dot structure for [tex]\rm H_2CCH_2[/tex], there is one covalent bond present between the carbon atoms. The correct answer is option c.

A dot structure is a method of depicting an atom's valence electrons by placing dots around the atomic symbol. One valence electron is represented by each dot.

In the Lewis dot structure of [tex]\rm H_2CCH_2[/tex], there is one bond between the carbon atoms. This is because each carbon atom has two electrons in its valence shell, and each hydrogen atom has one electron in its valence shell.

The two carbon atoms share two electrons to form one covalent bond, and each carbon atom also shares one electron with a hydrogen atom to form two additional covalent bonds.

Therefore, the correct answer is option c. There is one bond (covalent bond) between the carbon atoms in the Lewis dot structure for [tex]\rm H_2CCH_2[/tex].

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Answer:

Energy is absorbed by the atom.

Explanation: