PLSSS HELPPP MEEE WITH THIS QUESTIONNNNN NO GUESSING PLSSSS
Which process is shown in the plant cell below?

A= cell growth
B= cell reproduction
C= metamorphosis
D= photosynthesis

Answer: C

Explanation:

A P E X

The VSEPR theory predicts the shape and molecular geometry of the molecule.

Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.

It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.

They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.

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Answer:

They form K₂O (Potassium oxide) and HCl (Hydrochloric acid). This is because K and H are positively charged and O and Cl are negatively charged and cations only bond with anions.

Answer:

A lower pH of the mouth creates bad bacteria that eventually lead to decay of the tooth.  

It can be prevented by avoiding food that causes acidity.

Explanation:

Tooth decay is caused by the pH level in the mouth dropping below 5.5, meaning it is acidic. It can be prevented by brushing your teeth as toothpaste is an alkali which will neutralise the pH level in your mouth.

Hope this helps

Answer:

D is the correct answer acidity

Explanation:

pH is the logarithmic measurement of the H3O+-concentration in water solutions.

By definition: pH = -log[H3O+]

Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so

pH = -log(H3O+) = -log(1.0*10-7) = 7.0

Answer:

1. 1.72 moles of potassium.

2. All of the answers are true

3. Are used up during a reaction

Explanation:

Recall that the number of moles is obtained from;

Number of moles= Mass of potassium/ molar mass of potassium

Mass of potassium= 67 g

Molar mass of potassium= 39 gmol-1

Number of moles of K= 67 g/ 39 gmol-1

Number of moles = 1.72 moles of potassium.

2. When we look at all the options, we will realize that all the options are true. The rate of reaction doubles for each 10°C rise in temperature, increasing reactant concentration increases particle collision and ultimately increases the rate of reaction. Rate of reaction deals with rate of disappearance of reactants or rate of appearance of products.

3. Catalysts remain unchanged in a chemical reaction because they do not actually participate in the reaction. Hence they are not used up in any chemical reaction.

Answer:

Molar mass of BaSO4 = 137.3 + 32 + (16 ×4)

= 137.3 + 32 +64

= 233.3g/mol

Molar mass = mass/ number of moles

= 233.3 g/mol = mass/ 1 mol

mass = 233.3g

Hope this helps.

Answer:

In order to take steps by humans for controlling the change in climate.

Explanation:

It is important that scientist find out the change which occurs in the climate with the passage of time by performing experiments and also repeat the experiments in order to verify their findings. Due to these experiments, scientists also find out the reasons behind of climate change which enable us to take steps in preventing the change that occurs in the environment. it is also important for scientists to be able to explain how they know that climate has changed over time in order to explain that he is not assuming or making predictions, he has to provide evidence for his statement which is only be possible through experiments.

Answer:

There are C - C  bonds and C - H bonds.

trust me! I took a test with this question and got 100! :)

Explanation:

Answer:

One of the most common ways of producing UV light is passing an electric current through vaporized mercury or some other gas. This type of lamp is commonly used in tanning booths and for disinfecting surfaces. The lamps are also used in black lights that cause fluorescent paints and dyes to glow.Explanation:

Answer:

There are no oxygen

Explanation:

Hydro is used when naming hydrogen compound and oxo is used when naming oxygen compound

Answer:

12.78 or 12.80 mostly like 12.78

Explanation:

Answer:

Dmitri Mendeleev

Explanation:

He was a Russian Scientist who decided to reorganize the periodic table after other notable scientists such as Antoine-Laurent Lavoisier had also tried to organize it based on the states of matter of the elements.

Mendeleev reorganized the period in the order of increasing atomic mass although there were some other modifications by modern scientists.

Answer: A. 490.48mol

Explanation:

Using the ideal gas equation; PV =nRT

where P = Presssure = 200 atm

          V = Volume = 60L

          n = Number of moles

          R = Gas constant = 0.08206 L.atm/mol/K

          T = Temperature = 25 °C  + 273 = 298K

Make "n" the subject of the formular;

n =  PV /  RT

   =  200   x    60   /    0.08206 x  298

   =  490.73  mol, which is closest to  option A. 490.48mol

alkali metals

a.pex

yes

Answer:

Option C. By increasing the temperature

Explanation:

From the graphical illustration above, we see clearly that the volume and temperature of the gas are directly proportional. This implies that as the temperature increases, the volume will also increase and as the temperature decreases, the volume will also decrease. This can further be explained by using the ideal gas equation as shown below:

PV = nRT

P is the pressure.

V is the volume.

n is the number of mole.

R is the gas constant.

T is the temperature.

PV = nRT

Divide both side by P

V = nRT/P

Since n and P are constant, the equation above becomes:

V & T

V = KT

K is the constant.

The above equation i.e V = KT implies that:

As T increases, V will also increase and as T decreases, V will also decrease.

Considering the question given above,

The volume of the gas can be increased if the temperature is increased.

Answer:

147.222 degrees C

Explanation:

assuming its  297 F it should be correct

The temperature outside is 297°F then this temperature in celsius is equal to 147.22 °C.

Temperature can be described as a physical quantity that expresses quantitatively the perceptions of hotness or coldness. The most general scales are the Celsius scale with (°C), the Fahrenheit scale (°F), and the Kelvin scale (K), the latter being used predominantly for scientific purposes.

Fahrenheit to Celsius formula can be used to change the temperature from the scale Fahrenheit to degrees Celsius.

The formula that can be used to convert Fahrenheit to Celsius is given below:

[tex]\dusplaystyle ^oC = (^oF - 32) \times \frac{5}{9}[/tex]

Here, F represents the temperature in Fahrenheit, and C represents the temperature in Celsius.

Given the temperature in Fahrenheit = 297 °F

[tex]\dusplaystyle T( ^oC) = (297 - 32) \times \frac{5}{9}[/tex]

T = 147.22 °C

Therefore, the given temperature in celsius is equal to 147.22 °C.

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Answer:

Explanation:

In case of Water there are strong hydrogen boding excist as result shows high boiling point, wher as in case of methane the there is no hydrogen bond and excist weak vanderwall attraction between the molcuels so the lower boiling point.

Answer:

Strong Nuclear Force

Explanation:

Strong Nuclear Force; is the force that keeps the nucleons bound inside the nucleus of an atom. It is a short range attractive force that acts between all nucleons in the nucleus of the atom that is much stronger than electrical forces. 

Answer:

nuclear force

Explanation:

Answer:

the 3rd one (0.01 cm the one selected already)

Explanation:

copper wire isn't excessively big, and it wraps around the pencil because its malleable. I think that the most accurate would be 0.01 cm

Even though you asked for ONE WAY, I found some other good ways.

1. Thoroughly wash plastic soda bottles or milk jugs with warm, soapy water.

2. Store sealed containers in a dark, dry, and cool place.

3. If after six months you have not used the stored water, empty it from the containers and repeat steps 1 through 3 above.

Answer:

Explanation:

V1/T1 =V2/T2    at constnant pressure

Answer:

c

Explanation:

Answer:

The alkanes comprise a series of compounds that are composed of carbon and hydrogen atoms with single covalent bonds. This group of compounds comprises a homologous series with a general molecular formula of C n H 2 n+2 , where equals any integer.

Explanation:

The general formula for the alkane series is CnH2n+2

In this formula:

"Cn" shows how many carbon atoms are in the alkane molecule.

"H2n+2" shows the amount of hydrogen atoms in the alkane compound, with "n" being the number of carbon atoms.

Alkanes are a group of hydrocarbons that only have single bonds between their carbon atoms. The formula says that each carbon atom is connected to two hydrogen atoms. And the total number of hydrogen atoms in an alkane molecule is two more than double the number of carbon atoms.

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Answer and Explanation:

For computing the initial quantity of helium we have to apply the law of ideal gas which is shown below:

[tex]pV=nRT\[/tex]

[tex]n=\dfrac{pV}{RT}[/tex]

Now we have to compute the ratio between the initial and the final numbers of moles which is

[tex]\dfrac{n_1}{n_2}=\dfrac{\dfrac{p_1V_1}{RT_1}}{\dfrac{p_2V_2}{RT_2}}[/tex]

The statement defines that

[tex]T_1=T_2,~p_1=p_2.[/tex]

Therefore

[tex]\dfrac{n_1}{n_2}=\dfrac{V_1}{V_2}[/tex]

[tex]\dfrac{n_1}{3.8\times10^{-4}}=\dfrac{230}{860}\iff\\\\ n_1=\dfrac{3.8\times10^{-4}\times230}{860}[/tex]

[tex]\boxed{n_1\approx1.0\times10^{-4}~mol}[/tex]

And, the variables are known is starting volume and ending gas quantity

Answer:

beginning volume and ending quantity of gas

Explanation:

Answer:

Freshly prepared ferrous sulphate is used in brown ring test, because if FeSO4 is stored or it is the old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown-yellow coating of basic ferric sulphate, which is an adduct of ferric oxide and ferric sulphate

HEYA FRIEND

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HERE'S YOUR ANSWER

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It is used in brown ring test because , if Fe2So4 is stored or it is old one then it reacts with atmospheric oxygen and gets oxidized to form a corrosive brown yellow coating of basic ferric sulphate , which is an adduct of ferric oxide and ferric sulphate.

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HOPE IT WILL HELP YOU UP

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KATË

Answer:the branch of science which examines the material of the universe and changes that these materials undergo

Chemistry deals with composition,structure,properties of matter and changes that these materials undergo

Answer:

Volume=mass in g /density

Answer: 40cm^3 or 40ml

Explanation:

[tex]Density=\frac{mass}{volume}[/tex]

so 5=200/V

V=200/5

V=40cm^3

Answer:

Cooffee

Explanation:

the answer is coffee because coffee might be bitter

Answer:Coffee

Explanation:Water is neutral, while the other answers are mostly organic acids but salt water is neither acidic nor basic

Answer:

Explanation:es porque las especies con nichos idénticos tienen las mismas necesidades, lo que significa que competirían exactamente por los mismos recursos.