Can somebody plz help and these t or f questions correctly (only if u really know the correct ones) thx sm! :3

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Answer:

Acetone

Explanation:

Chromatography has to do with the separation of substances by eluting the components of the solute using a mobile phase. The composition of the mixture to be separated decides the mixture of solvents (mobile phase) that are to be used for elution.

In this case the mixture to be separated comprises of substance A which is polar and substance B which is non polar. It is observed that the mobile phase moves B up the plate but not the polar substance, A. This means that a polar solvent such as acetone should be added to the mobile phase in order to achieve better elution of A.

Answer:

Heyya!

Here are your answers along with the questions:-

Answer:

0.974 atm; 740 mm Hg; 98.7 kPa; 0.987 bar

Friction acts in the opposite direction to the direction of an object's motion. Therefore, option (b) is correct.

Friction can be defined as the resistance provided by the surfaces that are in contact when they pass over each other. Friction offers the traction that is required to walk without slipping.

Friction can be described as a force that is dependent on external factors.  Friction depends upon the nature of the two surfaces that are in contact and on the smoothness or roughness of the two contacted surfaces. When one body moves over the surface of another, these irregularities on the surface of the bodies get entangled and develop friction.

Friction depends upon the force that is exerted on these surfaces and increases when the force is applied along with the irregularities. Types of Friction are Rolling friction, Static friction, Sliding friction, and Fluid friction.

The force of friction acts in the opposite direction to the direction of an object's motion.

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Answer: As sodium carbonate is added, bubbles of carbon dioxide form. When all the acid has been neutralised, adding sodium carbonate will no longer produce bubbles of carbon dioxide gas. The final rinsing with water should remove traces of the water soluble salt formed.

Explanation:

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Answer:

1.46 mol of H₂

Explanation:

This easy question can be solved by a rule of three.

At STP conditions, we know that 1 mol of any gas is contained in 22.4L.

So let's make the operation:

22.4L is the volume for 1 mol of any gas, at STP

32.6 L may be the volume for (32.6 . 1) /22.4 = 1.46 moles.

We can also apply, the Ideal Gases Law.

At STP conditions, Temperature is 273.15 K and pressure is 1 atm

P . V = n . R . T

n = (P . V) / R. T → (1 atm . 32.6L) / (0.082 . 273.15K)

n = 1.455 mol

Jennifer has a jar full of stones. For one year, Jennifer shakes the jar several times each day. The illustration below shows the changes that occurred after one year, and this shows that because of the fragmentation, this happens.

Initially, before a year, there were many rocks, but as she continuously shrank the box, that led to the fragmentation. Due to vibration for a long time, the larger rocks break into the smaller particles as a result of the amount of rocks converted into the small particles and sands. These smaller stone fragments may then accumulate at the bottom of the jar as a result of this there is a decrease in the overall number of stones in the jar.

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Answer: The pH of the solution is 8.8

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.pOH is calculated by taking negative logarithm of hydroxide ion concentration

[tex]pH=-\log [H^+][/tex]

[tex]pOH=-log[OH^-][/tex]

pH+pOH=14

Putting in the values:

[tex]pH+5.2=14[/tex]

[tex]pH=8.8[/tex]

Thus pH of the solution is 8.8

Answer:

d

Explanation:

because the water has to be more , the KBR Is (excess) but however it is saturated!

thank you

Answer:

translate DNA into RNA I hope it helps

Answer:

_________(question)__________

. A green colour substance 'X' is heated strongly. Its colour changes to 'Y' and smell of burning sulphur is given out.

Explanation:

___(answer)___

a.

_______________

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Answer:

529.50g

Explanation:

Molar mass find by looking at the periodic table and add all the molar mass of the chemicals together

Mg=24.30g

N=14.01g

O=16.00g

Mg(NO3)2=24.30+(14.01+16.00x3)x2=148.32g/mol

148.32x3.57=529.50g

Answer:

The pricing strategy is an important element in setting up the selling price of a product.

Explanation:

The pricing strategy is an important consideration while fixing up the selling price of product manufactured. When setting up a selling price of a product, the companies set up product calculation. Businesses should decide the pricing strategy before they advertise the products to the customers.  

There are mainly 5 benefits to the businesses while doing a product calculation. They are:

--- Doing competition based pricing enables the company to compete with the rival companies product and is based on the market based study. Competition pricing is a useful tool for the retailers as well as the small businesses.

---  Doing a cost plus pricing helps the total cost of making the product and also an add up in the market in order to determine the pricing of the product.

--- Dynamic pricing :

    Dynamic pricing is a non static pricing. Dynamic pricing is an efficient method for the market based on the supply and demand.

--- Penetration pricing :

 Penetration pricing is used by the large companies which is used to capture the market share by the setting product prices at the below market level so as to gain customers.

--- Doing a research for the price skimming helps the company to set up the accurate price for the product rather than readjusting the prices of the product later on based on the demand and the supply.

Answer:

[tex]T_f=57.3\°C[/tex]

Explanation:

Hello there!

In this case, for this calorimetry problem, it is possible to realize that the hot water at 87.6 °C is cooled down whereas the cold water at 34.5 °C is heated up, according to:

[tex]Q_{cold}=-Q_{hot}[/tex]

Which in terms of mass, specific heat (cancelled out because they have the same value for being water) and temperature difference, is:

[tex]m_{cold}C_{cold}(T_f-T_{cold})=-m_{hot}C_{hot}(T_f-T_{hot})\\\\m_{cold}(T_f-T_{cold})=-m_{hot}(T_f-T_{hot})[/tex]

Thus, solving for the final temperature, we obtain:

[tex]T_f=\frac{m_{cold}T_{cold}+m_{hot}T_{hot}}{m_{cold}+m_{hot}}[/tex]

Then, we plug in to obtain:

[tex]T_f=\frac{200g*34.5\°C+150g*87.6\C}{200g+150g}\\\\T_f=57.3\°C[/tex]

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Answer:

devide by avogadro constant 6.02*10^23

Explanation:

Explanation:

[tex]31.5 \: g \: aommnia \: \times \: \frac{1 \: mol \: ammonia}{8 \: g \: ammonia \: } \: \times \frac{3 \: mol \: hydrogen}{2 \: mol \: ammonia} \: \times \frac{1 \: g \: hydrogen}{1 \: mol \: hydrogen} = \: 5.90625 \: g \: hydrogen \: must \: react \: [/tex]

Answer:

[tex]\boxed {\boxed {\sf C. \ Provide \ the \ water \ needed}}[/tex]

Explanation:

Photosynthesis is an extremely important process for plants, algae, and some bacteria. It helps create their "food", which is glucose. It is turned into energy so the organism can grow, repair damages, and carry out other processes.

The equation for photosynthesis is as follows:

[tex]H_2O+CO_2+energy \rightarrow C_6H_{12}O_6 + O_2[/tex]

Water, carbon dioxide, and light energy from the sun are converted to glucose and oxygen.

Roots are important for obtaining water. Since they reach into the soil, they can absorb the water. Then, capillary action draws the water up the stem into the xylem and then into the leaves, where photosynthesis occurs.

Answer:

Three ways I can come up with are increasing the temperature, increased the amount of solvent, and using a solvent with similar polarity as the solute.

Explanation:

Answer:

See explanation

Explanation:

1) The reaction of magnesium with oxygen is;

Mg(s) + O2(g) -----> MgO2(s)

The oxidizing agent is the reactant whose oxidation number decreases from left to right in the reaction equation. The oxidation state of oxygen decreased from zero to -2 hence oxygen is the oxidizing agent in the reaction.

2) The advantages of fuel cell includes;

i) it is a clean source of energy

ii) Fuel cells operate quietly and do not constitute noise pollution

One disadvantage of the fuel cell is that its operation is costly.

3) Electrolytic and voltaic cell are similar because they are both electrochemical cells and involve a transfer of electrons between two electrodes.

Electrolytic cells do not operate spontaneously while voltaic cells operate spontaneously. In the volatic cell the anode is negatively charged while the cathode is positively charged. In the electrolytic cell, the anode is positively charged while the cathode is negatively charged.

Answer:

E. 5.049

Explanation:

Multiply the concentration by volume (in liters) first to get moles of NaOH. Then multiply by the molar mass of NaOH to convert to grams.

0.18 M • 0.7000 L = 0.126 mol NaOH

0.126 mol • 39.997 g/mol = 5.040 g --> The closest answer seems to be e. 5.049 g

Answer:

1×10^5

Explanation:

Pressure = Force/Area

P= 10/0.0001

P= 10000

P=1×10^5

Answer:

0.38

Explanation:

The formula for finding density is mass/volume. So the equation becomes 6.39/16.5 which gives you 0.38

According to the website that I use to figure out things about science or chemistry and that stuff... The answer is 3.5 L KBr x 1.7 mol KBr solute / 1 L KBr solution x 1 mol Cl2 / 2 mol KBr x 70.9 g Cl2 / 1 mol Cl2 = 211 g Cl2.

Answer:

alkali metals

alkali earth metals

transition metals

non metals

noble gases

halogens

rare earth metals

Explanation:

Answer:

Ocean waves are longitudinal waves, Sound waves are transverse waves. Ocean waves are electromagnetic waves, Sound waves are mechanical waves. A Sound wave of over 20,000 Cycles per Seconds is inaudible to Humans.

Explanation:

Answer:

Ocean waves are mechanical waves while Sound waves are electromagnetic waves

Explanation:

Answer:

Here is every answer for analog and digital (in order)

Analog:

Digital (in order):

Explanation:

I did mine in bullet points, hopefully this helped!

Analog:

Signal Shape: Smooth and continuous

Numerical Values for Signal Estimations: Analog signals speak to one ceaseless variable as the result of another ceaseless time-based variable.

Amount of Information that can be transmitted: analog circuits can conduct as it were reasonably low-speed information communications.

Energy necessities: light, sound, temperature, position, and pressure Privacy and security : not encrypted

Clarity of Signal: clamor influences clarity and quality, commotion is amplified,

Digital:

Signal shape: stepping, square, and discrete

Numerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement

Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly.

Energy requirements: voltage, accoustic pressure.

Privacy and security: encrypted

Clarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is high

Analog signal could be a continuous signal which speaks to physical estimations.

Digital signals are discrete time signals created by computerized balance.

Example :Human voice in discuss, analog electronic gadgets. Computers, CDs, DVDs, and other advanced electronic gadgets.

Mmmmmmmh prolly fake stone

Answer:

GUESS IT IS FAKE.........?