PLEASSSSEEEE HEEEEELLLLLPPPPP

Positive DH values
Select one:
a. always cause a process to proceed spontaneously
b. tend to cause a process to proceed spontaneously
c. tend to prevent a process from proceeding spontaneously
d. always prevent a process from proceeding spontaneously

Answer: unlike, will not scatter

Explanation:

Colloids are unlike solutions because their dispersed particles are much larger than those of a solution. The dispersed particles of a colloid cannot be separated by filtration, but they scatter light, a phenomenon called the Tyndall effect.

Answer:

0.200 M

Explanation:

Begin by finding how many moles of KCl there are by using the molarity and given volume:

[tex]\frac{0.600 mol}{1000 mL} x \frac{200.0 mL}{1} = 0.12 mol KCl[/tex]

(Remember that molarity is mol/L, which is equal to mol/1000 mL.)

Next, divide the moles of KCl by the new volume (after dilution):

[tex]\frac{0.12 mol KCl}{600.0 mL} x \frac{1000 mL}{1 L} = \frac{0.200 mol KCl}{1 L} = 0.200 M[/tex]

The new concentration is 0.200 M.

The new concentration of the KCL solution is 0.200M

HOW TO CALCULATE CONCENTRATION:

C1V1 = C2V2

Where;

C1 = initial concentration of the solution

C2 = final concentration of the solution

V1 = initial volume of the solution

V2 = final volume of the solution

V1 = 200mL

V2 = 600mL

C1 = 0.600 M

C2 = ?

C2 = C1V1 ÷ V2

C2 = (0.600 × 200) ÷ 600

C2 = 120 ÷ 600

C2 = 0.2M

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Answer:

hi

Explanation:

than you for points and thank me if you like

Answer:

Two physical properties that would allow differentiation between copper, lead and iron shot are - Color and Density

COPPER - Color - Copper has a reddish brown color .

                Density - Density of copper is 8.96 [tex]g/cm^{3}[/tex]

LEAD - Color - Lead is grey in color.

           Density - Density of Lead is 11.34[tex]g/cm^{3}[/tex]

IRON SHOT - Color-  Iron shot is in grey color with extra shine .

                       Density - Density of iron shot is 10.49 [tex]g/cm^{3}[/tex]

Explanation:

COPPER- Copper (Cu) is a reddish, highly ductile metal that belongs to Group 11 (Ib) of the periodic table and is a particularly excellent conductor of electricity and heat. Copper is found in nature in its free metallic state.

LEAD- Lead (Pb) is a soft, silvery white or grayish metal in Periodic Group 14 (IVa). Lead is a weak conductor of electricity and is very malleable, ductile, and thick. Lead, which has been known since antiquity and is considered the oldest of metals by alchemists, is extremely durable and corrosion-resistant, as evidenced by the continued use of lead water pipes constructed by the ancient Romans.

IRON SHOT - Small round iron balls used as projectiles are known as iron shot. Balance scales are used with simple weights. Iron balls are used in the shot put competition.

Hence , the differentiation is mentioned in the above answer.

The unknown element is most likely a metalloid. Metalloids have  shiny surface  and conduct electricity less than metals but are brittle in nature.

Metalloids are a class of elements having chemical and physical properties intermediate to that of metals and non-metals.

Like metals, metalloids have shiny  surfaces and appear like a metal but they conduct heat and electricity not as much as metals do.

Boron, germanium, silicon etc. are metalloids and they can form alloys with other metals to be useful in many applications. Metalloids are brittle in nature and thus break easily.

Hence, the sample that the student have is a metalloid and 3rd option is correct.

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Answer:

Explanation:What is the demand factor for three commercial ranges?

Answer:

no equivalent peak, upfield between 0 and 3 ppm

Explanation:

NMR stands for nuclear magnetic resonance. It is a spectroscopic technique that is used for observing the local magnetic fields around an atomic nuclei. It is used to study the chemical, physical and biological properties of the matter.

In the context, the structures of the benzaldehyde and the benzyl alcohol are distinguished by the proton NMR. The hydrogen atom of aldehyde appears downfield between 9 and 11 ppm and also there is no equivalent peak for the alcohol.

The methylene hydrogens will only be significant upfield between the 0 and 3 ppm peak between the given structures.  

Answer:

Option D. 3 ppm isopropanol

Explanation:

The following data were obtained from the question:

Mass of isopropanol = 6 mg

Mass of water = 2 Kg

Isopropanol concentration =?

The isopropanol concentration can be obtained as follow:

Concentration = mass isopropanol / mass of water

Isopropanol concentration = 6 mg / 2 kg

Isopropanol concentration = 3 mg/Kg

Finally, we shall convert 3 mg/Kg to ppm. This can be obtained as follow:

1 mg/Kg = 1 ppm

Therefore,

3 mg/Kg = 3 ppm

Thus, we can conclude that the concentration of isopropanol is 3 ppm.

The colors used to indicate the change in average temperature over time from 1884 to 2012 can vary depending on the specific visualization or representation being used.  However, in many temperature visualizations, a common color scheme is employed to represent temperature anomalies or changes relative to a reference period.

In this color scheme, cooler temperatures are often represented by shades of blue or green, while warmer temperatures are depicted by shades of yellow, orange, or red. The intensity or darkness of the colors may also correspond to the magnitude of the temperature change.

For example, if a visualization shows a map with regions colored in blue or green, it suggests that those areas experienced a cooling trend or had lower average temperatures during the specified time period. Conversely, if the map shows regions colored in yellow, orange, or red, it indicates a warming trend or higher average temperatures.

By examining the distribution of colors on the visualization, one can gain insights into the spatial patterns and changes in average temperatures over the specified time frame.

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Answer:

letter C I'm not sure to my answer but hope it can hrlp

The reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

A saturated solution is one that contains as much solute as it can normally hold at a particular temperature.

We know that magnesium hydroxide is less soluble than potassium hydroxide. Hence, the reason why magnesium hydroxide is  less basic than a saturated solution of potassium hydroxide is that magnesium hydroxide is less soluble than potassium hydroxide.

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Answer:

yes

Explanation:

it is

Answer: D. form cations.

I think

Explanation:

Answer:

The correct answer is -

1.  a) The bubbles will shrink, some may vanish.

2. a) Can A will make a louder and stronger fizz than can B.

Explanation:

In the first question, it is given that the bottle is not opened and therefore, squeezing the bottle filled with a carbonated drink will increase the pressure on the carbonated liquid which forces the bubbles to dissolve or displace or vanish as it moves to empty space.

Thus, the correct answer would be - The bubbles will shrink, some may vanish

In the second question, there are two different conditions for two different unopened cans of carbonated water that are different temperatures one at the garage with higher temperature and one in the fridge at low temperature. As it is known that higher the temperature less will be solubility of gas in liquid so gas in can A will be less soluble which means it has more gas and it will make louder and stronger fizz than B which was stored at low temperature.

thus, the correct answer would be - Can A will make a louder and stronger fizz than can B.

Answer:

three reasons

Explanation:

plasma membrane, cytoplasm, nucleus 2)The three main components of the lipid bilayer portion of a plasma membrane are phospholipids, cholesterol, and glycolipids.

Answer:

[tex]T_{EQ}=42.1\°C[/tex]

Explanation:

Hello there!

In this case, since we are looking for an equilibrium temperature, we can evidence how the net heat flow is 0 as all the heat released by the hot brass is absorbed by the water:

[tex]Q_{brass}+Q_{water}=0[/tex]

Thus, by writing that equation in terms of mass, specific heat and temperature we obtain:

[tex]m_{brass}C_{brass}(T_{EQ}-T_{brass})+m_{water}C_{water}(T_{EQ}-T_{water})=0[/tex]

Thus, by applying the following algebra, it is possible to arrive to a clean expression to obtain the equilibrium temperature:

[tex]m_{brass}C_{brass}T_{EQ}+m_{water}C_{water}T_{EQ}=m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}\\\\T_{EQ}(m_{brass}C_{brass}+m_{water}C_{water})=m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}\\\\T_{EQ}=}\frac{m_{water}C_{water}T_{water}+m_{brass}C_{brass}T_{brass}}{m_{brass}C_{brass}+m_{water}C_{water}}[/tex]

Then, by plugging the masses, specific heats and initial temperatures in, we obtain:

[tex]T_{EQ}=\frac{130g*4.184\frac{J}{g*\°C} *35.0\°C+130g*0.380\frac{J}{g*\°C}*120.0\°C}{130g*4.184\frac{J}{g*\°C} +130g*0.380\frac{J}{g*\°C}}\\\\T_{EQ}=42.1\°C[/tex]

Best regards!

Answer:

A. It denatures and coagulates during cooking.

(Photo for proof at the bottom.)

Explanation:

All proteins coagulate by heat. Its natural characteristics disappear, or denatures, when cooked. Heat causes proteins to vibrate, and breaks bonds that hold the complex shape of the proteins. These broken strands of protein then stick together. In basic terms, the structure of protein changes when cooked.

Here's a photo of Edge incase you're doubtful.

Please click the heart if this helped.

Answer:

A

Explanation:

EDGE 2022

Yes. Light from the sun can pull energy out of the ink, causing it to become visible

___________________________________

Sorry if wrong

Answer:

a) 0.714g of bicarbonate of soda are required.

b) 0.221g of Al(OH)₃ are required

Explanation:

The reactions of HCl with bicarbonate of soda and aluminium hydroxide are:

HCl + NaHCO₃ → H₂O + NaCl + CO₂

3 HCl + Al(OH)₃ → 3H₂O + AlCl₃

The moles of HCl that we need neutralize are:

50mL = 0.050L * (0.17mol / L) = 0.0085 moles HCl

To solve these problem we need to find the moles of the antacid using the chemical reaction and its mass using its molar mass;

a) Moles NaHCO₃ = Moles HCl = 0.0085 moles

The mass is -Molar mass NaHCO₃: -84g/mol-

0.0085 moles * (84g / mol) = 0.714g of bicarbonate of soda are required

b) 0.0085 moles HCl * (1mol Al(OH)₃ / 3mol HCl) = 2.83x10⁻³ moles Al(OH)₃

The mass is -Molar mass: 78g/mol-:

2.83x10⁻³ moles Al(OH)₃ * (78g/mol) =

According to the percent composition concept, the percent of chloride ion  is 96.07%.

Percent composition  is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.There are two types of percentage compositions percent weight by volume and percent volume by volume .Advantages of using percent compositions is that molecular weight of compound is not required.

In the given example, percent of chloride ion is estimated as, mass of chloride ion/mass of AgCl×100

On substitution in above formula, percent composition=1.0881/1.1324×100=96.07%.

Thus, the percent of chloride ion is 96.07%.

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Answer:

Work Done= Force×Displacement

Thus

Work Done = 20×10

Work Done = 200Joules

Answer:

1/2

Explanation:

Half of 6 is 3 so therefore it is a half.

Answer:

See explanation

Explanation:

Electron affinity is the energy released when an extra electron is added to a neutral gaseous atom. A negative value of electron affinity indicates that energy is given out and vice versa.

Metals have positive electron affinity since electrons rarely accept electrons, so;

Na(g)+ 1e^- → Na^-(g)      positive

Mg(g)+1e^- → Mg^-(g)      positive

For the last case; Br(g)+ 1e^- → Br^-(g), the electron affinity for the non-metals is negative. hence the answer

Answer:

Explanation:

The molecular formula for Guanylate is [tex]\mathbf{C_{10} H_{14} N_5O_8 P}[/tex]

This is calculated by the addition of the atomic weight of all the atoms taking part in the molecule.

i.e. (10 × C) +  (14 × H) + (5 × N) + ( 8 × O) + (1 × P)

= (10 × 12) +  (14 × 1) + (5 × 14) + ( 8 × 16) + (1 × 30)

= 120 + 14 + 70 + 128 + 30

= 362 g/mol

The diagram for the tautomers of hypoxanthine can be seen in the image attached below.

Dihydrouridine is available and can be seen in tRNAs and rRNAs. It is an exceptionally preserved and adjusted base. It is a pyrimidine nucleoside that is shaped by the expansion of two hydrogen atoms to uridine. By the expansion of two hydrogen atoms to uridine makes it completely soaked and no presence of any two-fold or double bond.  

Catalytic reduction of carbon-carbon double bonds in Dihydrouridine synthase occurs at positions 5 and 6 on the uridine base.  

Hence, 5 and 6 carbon particles inside the uracil moiety of this nucleotide have two hydrogens each connected to them.

Answer:

0.082 moles

Explanation:

To answer this question we'll need to use the definition of molarity:

We are given the molarity and mililiters, so now we convert 205 mL into L:

Now we can calculate the number of moles:

0.400 M = moles / 0.205 L

Answer:

water - Yes because the do drink water

Air - yes they need to breath or alse they would not do good

warmth - yes or they die from coldness

Light - yes to get there food

soil - yes nution for there roots

Explanation:

Hopes it helps

Explanation:

I hope this helps Chemistry is so hard and I hate it

I think it's ethane. It might be wrong tho.