can someone help me with number 2

Answer:

Plant cells are surrounded by a cell membrane and outside this is a fairly rigid cell wall. The cell wall gives the plant cell a more definite shape than an animal cell. Animal cells do not have a cell wall.

Explanation:

True because It is flexible, but provides strength to the cell which helps protect the cell against physical damage. It also gives the cell its shape and allows the organism to maintain a certain shape o

Answer:

1. 0.1712M

2. 6.86mg/mL Ca, 12.14mg/mL Cl, 6860000ug/L Ca, 12140000ug/L Cl, 6860mg/L Ca, 12140mg/L Cl, 6860ug/mL Ca, 12140ug/mL Cl.

3. 6860ppm Ca and 12140ppm of Cl.

4. 1.5mL of the 1000ug/mL barium standatd must be taken.

Explanation:

1. Molarity is defined as the amount of moles of solute (Calcium chloride) present in 1L of solution.

The moles of CaCl₂ are:

1.9g CaCl₂ * (1mol / 110.98g) = 0.01712 moles

In 100mL = 0.10L:

0.01712mol / 0.10L = 0.1712M

2. The masses of Calcium and Chloride ions are:

1.9g * (40.078g Ca / 110.98g) = 0.686g Ca

And:

1.9g - 0.686g Ca = 1.214g Cl

mg/mL:

686mg Ca / 100mL = 6.86mg/mL Ca

1214mg Cl / 100mL = 12.14mg/mL Cl

ug/L:

686000ug / 0.1L = 6860000ug/L Ca

1214000ug/ 0.1L = 12140000ug/L Cl

mg/L:

686mg Ca / 0.1L = 6860mg/L Ca

1214mg Cl / 0.1L = 12140mg/L Cl

ug/mL:

686000ug Ca / 100mL = 6860ug/mL Ca

1214000ug Cl / 100mL = 12140ug/mL Cl

3. ppm are defined as mg/L, the ppm of Ca are 6860ppm Ca and 12140ppm of Cl

4. The solution must be diluted from 1000ug/mL to 30ug/mL, that is a dilution of:

1000ug/mL / 30ug/mL:

33.33 times must be diluted the solution.

As final volume of the diluted solution must be 50mL, the volume of the standard needed is:

50mL / 33.33 times = 1.5mL of the 1000ug/mL barium standatd must be taken

Answer:

Scientists hypothesized that WNS, caused by the fungus Pseudogymnoascus destructans, makes bats die by increasing the amount of energy they use during winter hibernation. Bats must carefully ration their energy supply during this time to survive without eating until spring

Explanation:

Answer:

86% - 14% = 72%

Explanation:

Answer: A I believe

Explanation:

Answer:

Heat deals more with thermal energy whereas temperature deals with molecular kinetic energy.

Answer:

.0466 L

Explanation:

To start off, use dimensional analysis to convert everything to standard PV=nRT units.

[tex]\frac{39.0}{1}[/tex] x [tex]\frac{1}{1000}[/tex] = .039 L

[tex]\frac{802}{1}[/tex] x [tex]\frac{1}{760}[/tex] = 1.055 atm

17 +273 = 290

...and so on.

Solve for n for the starting pressure, volume and temp. You'll need it for the final equation.

n= PV/RT [tex]\frac{1.055 *.039}{.0821 * 290}[/tex]= .0017 number of moles

Solve for volume of the end point.

V= nRT/P [tex]\frac{.0017*.0821*280}{.838}[/tex] = .0466 L of helium, or 46.6ml Less pressure means it will take up more space.

Answer:

Yes, biomass is a renewable energy source

Explanation:

Biomass—renewable energy from plants and animals

Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. Renewable resources are replenished naturally and over relatively short periods of time.

Answer:

Explanation:

Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies while renewable resources are replenished naturally and over relatively short periods of time. Yes, Biomass is renewable organic material that comes from plants and animals.

Mole (mol): the amount of material counting 6.02214 × 1023 particles. The value of the mole is equal to the number of atoms in exactly 12 grams of pure ... A silver ring contains 1.1 x 1022 silver atoms. How many moles of silver are in ... Answers. 1. (a) 2.26 × 10. 24 silver atoms; (b) 1.42 × 10. 24 xenon atoms (c) 3.07 × 10.

Explanation:

During burning, elements in the coal are  converted to compounds called oxides.

An oxide is a compound formed by combination of an element with oxygen. Usually, when an element is burnt in oxygen, it combines with oxygen in the presence of heat to form oxides.

Coal contains carbon, nitrogen and sulfur. When coal is burnt, these elements combine with oxygen to form oxides. The products of combustion of coal are oxides of sulfur, oxides of carbon and oxides of nitrogen.

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Answer:

False, the independent variable goes on the bottom

The statement “In a graph, the independent variable will always go on the side.” is false. The correct option is B.

A graph is a simple way of representing data. It shows the relation between two or more data with lines, numbers, and charts. The mathematical graphs are of different types. Mainly, a graph has a line and an x-axis and y-axis.

The x-axis contains the independent variable, which is written n the bottom of the graph, horizontally. The y-axis contains the dependent variable, which is written on the left side of the graph vertically.

The independent variable change, but the dependent variable do not change. It is the input. The independent variable changes with the time or what is written on the dependent variables.

Thus, the correct option is B. False.

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Answer:

D) Trees

Explanation:

I'm sure its trees, because once you cut all trees you cant regenerate, or replenish them. hope im right, sorry of its wrong!!

The factor that would help to determine the distance of the ship from the fish would be  The amount of time it takes the sound waves to travel to the fish and back to the boat​.

This is the term that is used to refer to the total distance that would be traveled by a wave in a given cycle. The distance is usually calculated by the use of lambda. The use of Sonar would have to be determinant on the sound that is being heard.

We would have to check the way that the sound would have to come from the ship and then the way that it would have to be go back to the given boat that is used to report and find the school of fisn.

Hence we would say that The factor that would help to determine the distance of the ship from the fish would be  The amount of time it takes the sound waves to travel to the fish and back to the boat​.

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Answer:

1) combustion

2) double replacement

3) combination

4) combustion

Explanation:

The combustion of a compound refers to the reaction of that compound with oxygen to produce heat and light. In reactions (1) and (4) above, ethanol and methane reacted with oxygen to yield carbon dioxde and water. This is a combustion reaction.

Reaction(2) is a double replacement reaction because the both cations exchange their anion partners in the product.

Reaction (3) is a combination reaction. It involves the joining of two elements to form a new compound.

Answer:

corrosion resistance.

Explanation:

In summary, stainless steel does not rust because it is sufficiently reactive to protect itself from further attack by forming a passive corrosion product layer. (Other important metals such as titanium and aluminum also rely on passive film formation for their corrosion resistance.)

Oxygen

hope that helped.

Answer:

Explanation:

Diamond has lesser density than platinum . So , if we take equal mass of both , the volume of mass of platinum will be far less .

The density of both diamond and platinum are  more than water so both of them will be drowned in water completely . They will not float . On being drowned , platinum will displace lesser volume of water because of its less volume . So volume change in case of platinum mass will be far less . The volume change for diamond will be more because of its bigger size.

Answer:

Which atom is oxidized in the reaction of benzhydrol with bleach?

Explanation:

n this experiment, students will perform a simple oxidation reaction of a secondary

alcohol. Recall that Oxidation Is a Loss of electrons while Reduction Is a Gain of electrons (OIL

RIG). In order to apply this mnemonic, you must know the oxidation states of each atom within

the compound, with particular interest on carbon. Carbon can carry oxidation states ranging

from -4 to +4. A few examples are shown in Figure 1 below. It is also common for carbon to

carry an oxidation state of -3, -1, +1, and +3.

Figure 1. Examples of carbon’s oxidation levels.

You may have noticed that all of the compounds in Figure 1 are neutral and carbon has

zero formal charge in each example. The concept of oxidation state and formal charge are

similar with one important difference in the calculation. Both are calculated by taking the

difference between the valence electrons (from the periodic table) and the number of electrons

belonging to that atom within the molecule. For a given atom, the valence electrons will never

change but the electrons ‘belonging’ the atom in the molecule will vary depending on number of

lone pairs and attachments to more or less electronegative atoms. The important difference in

the calculation of oxidation states and formal charge is based on the following assignment of

bonding electrons (Figure 2). This is how the highlighted carbon in ethanol can have an

oxidation state of -1 but a formal charge of zero.

- Oxidation states assign bonding electrons to the more electronegative atom in a bond,

except when the two atoms are the same and the bonding electrons are split equally.

Answer:

so the reaction would probably would be a chemical reaction

"When benzophenone reduces to diphenylmethanol, leftover products include the CH2OH and NaBH3 species. The energetic CH2OH and NaBH3 quickly bond to give (CH2OH)H3B-Na+. This complex is the main second product of benzophenone reduction."

Reactant Ratios

"In life, four benzophenone molecules react with each BH4 complex. Since four benzophenone molecules each attract a hydrogen atom from the “BH4” hydrogen donor, four “CH2OH”s bond with each boron (B) atom. Realistically, the secondary product is (CH2OH)4B-Na+ and four diphenylmethanol molecules. Focusing on one benzophenone molecule at a time is helpful for explaining and understanding reaction steps."

i hope it helps

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Answer:

Carbon dioxide and water are turned into sugar and oxygen

Answer: ΔH for the dissolution of [tex]NH_4NO_3[/tex] is +26.0205 kJ/mol

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

[tex]Q=m\times C\times \Delta T[/tex]

Q = Heat released by solution  = ?

C = heat capacity = [tex]4.18J/g^0C[/tex]

Initial temperature of water  = [tex]T_i[/tex] = [tex]25.008^0C[/tex]

Final temperature of water  = [tex]T_f[/tex]  = [tex]23.348^0C[/tex]

Change in temperature ,[tex]\Delta T=T_f-T_i=(23.348-25.008)^0C=-1.66^0C[/tex]

Putting in the values, we get:

[tex]Q=75.0g\times 4.18J/g^0C\times -1.66^0C=-520.41 J[/tex]

As heat released by water is equal to heat absorbed by dissolution of [tex]NH_4NO_3[/tex]  

[tex]\text{Moles of}NH_4NO_3=\frac{\text{given mass}}{\text{Molar Mass}}=\frac{1.60g}{80g/mol}=0.02mol[/tex]  

Enthalpy change for 0.02 moles of [tex]NH_4NO_3[/tex] = 520.41 J

Enthalpy change for  1 mole of [tex]NH_4NO_3[/tex] = [tex]\frac{520.41}{0.02}\times 1=+26020.5J=+26.0205kJ[/tex]

ΔH for the dissolution of [tex]NH_4NO_3[/tex] is +26.0205 kJ/mol

Answer:

Purple flowers

Explanation:

Usually the dominant allele is a capital letter.

From the question, purple flowers are dominant to white flowers while white are recessive.

PP = Purple

pp = White

Answer:

Mostly purple flowers itself

Answer:

Your answer would be C.

Explanation:

Gamma radiation, unlike alpha or beta, does not consist of any particles, instead consisting of a photon of energy being emitted from an unstable nucleus. Having no mass or charge, gamma radiation can travel much farther through air than alpha or beta, losing (on average) half its energy for every 500 feet.

Gamma particles has no mass or charge.

Gamma radiations is a kind of radiations, which are emitted during a nuclear reaction. Gamma radiations are emitted in the form of photons of energy, they did not carry any particles like alpha, beta and proton. So, because of not carrying any particle this radiations have no mass and as it is on the form of energy they also do not carry any charge.

Hence, the particles which has no mass or charge is gamma.

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Answer:

0.71 g/mL

The liquid is diethylamine

Explanation:

Mass of the liquid = 1.23 kg of 1.23 * 10^3 g

Volume of the liquid = 1737.cm3

Let us remember that density is obtained as;

Density= mass/volume

Density= 1.23 * 10^3 g/1737cm^3

Density= 0.71 g/cm^3

Since we know that 1 mL=1 cm3 . So, 1 g/mL=1 g/cm3

So we can also write;

Density= 0.71 g/mL

The liquid is diethylamine

To solve this we must be knowing each and every concept related to speed. Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.

Speed may be defined as the distance traveled by an item in the amount of time it requires to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction. The term "velocity" refers to the combination of direction and speed.

The average speed is the total distance traveled by the item in a particular time frame. A scalar quantity is average speed. The magnitude of a scalar quantity indicates that it has no direction.

Mathematically,  

speed of light=2.998 x 10⁵m/s.

Time = (1.496x10⁸ km x 1000m/km) / (2.998 x  10⁵ m/s)

       =5x10⁵s

Therefore, 5x10⁵s it take light to travel from the Earth to the Sun.

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