Note: Please show all work and calculation setups to get full credit. T. he following may be used on this assignment: specific heat of (water=4.184 J/g oC; ice=2.03 J/g oC; steam=1.99 184 J/g oC); heat of fusion of water=80. cal/g; heat of vaporization=540 cal/g; 1cal=4.184J. Calculate the energy required (in J) to convert 25 g of ice at -15 oC to water at 75 oC.​

Answer:

1 Spinal fluid

2 Milk

3 Saliva

4 Urine

5 Gastric content

Explanation:

Hello there!

In this case, according to the given information, it turns out firstly necessary for us to calculate the pH of both gastric content and spinal fluid by using the following equations and works:

[tex]pH_{gastric}=-log(10^{-2})=2.0\\\\pH_{spinal}=14+log(10^{-6.6})=7.4[/tex]

Thus, we rank them as follows:

1 Spinal fluid

2 Milk

3 Saliva

4 Urine

5 Gastric content

Regards!

Answer:

Ph level 0-7 is a acid

ph level 7-14 is base

bases turn paper blue

acids dissolve metal

acids contain hydrogen ions

Explanation:

I dont know the last one all I know that they become neutral when acids and bases are mixed.

Helium atom would have the highest kinetic energy.

Kinetic energy is a form of energy that a gas has by reason of its motion.

If work, which transfers energy, is done on a gas by applying a net force, the gas speeds up and thereby gains kinetic energy

Different gas particles move at different speeds with there definite kinetic energy—gases with smaller particles tend to be moving faster at the same temperature, which means they have a higher speed.

Helium is the smallest particles and thus, it will be the gas with the highest speed.

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Answer:

the 2nd and 5th

Explanation:

they are both correct

Answer:

b and d | Glucose is a reactant in both photosynthesis and cellular respiration. | Carbon dioxide is a product of both photosynthesis and cellular respiration.

Explanation:

hope this helps.

Answer:

[tex][H^+]=[OH^-]=1.0x10^{-7}M[/tex]

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate the relative concentrations by using the following equations:

[tex]pH+pOH=14\\\\pH=-log([H^+])\\\\pOH=-log([OH^-])[/tex]

Thus, we realize that both pH and pOH are the same, 7, so that the concentration of H⁺ and OH⁻ are virtually the same, and can be calculated as follows:

[tex][H^+]=[OH^-]=10^{-7}=1.0x10^{-7}M[/tex]

Regards!

Answer:

68.97g of milk must be added

Explanation:

To solve this problem we need to use the equation:

Q = C*m*ΔT -Coffee cup calorimeter equation-

This equation relates mass and change in temperature with heat of solution, Q.

The energy that decreases in the milk is the same that increases in the milk. That is:

Q(milk) = Q(tea)

Using the equation:

4.184J/molK* Mass milk * (65.0°C - 7.00°C) = 4.184J /molK * 200g (Tea) * (85.0°C - 65.0°C)

Mass milk * 58.0°C = 200g * 20.0°C

Mass milk = 4000g°C / 58.0°C

Mass milk =

68.97g of milk must be added

Answer:

CH3CH2CH2CH3 + Cl2 --------> CH3CH2CH2CH2Cl + HCl

Explanation:

Alkanes react with halogens in the presence of light to yield alkyl halides. The degree of substitution increases as the reaction progresses. The reaction occurs by free radical mechanism.

The reaction between butane and chlorine molecule to yields a monosubstitution product occurs as follows;

CH3CH2CH2CH3 + Cl2 --------> CH3CH2CH2CH2Cl + HCl

Answer:

See explanation

Explanation:

Let us look at the reaction again;

Cr2O7 2- (aq) + H2O(l)⇄ 2CrO4 2-(aq) + 2H^+(aq)

When we add sodium hydroxide to the system as shown, the hydroxide ion removes the hydrogen ion thereby leaving a large concentration CrO4^2-(aq) in the system this causes the solution to turn green(equilibrium position shifts to the right).

The net ionic equation is;

OH^-(aq) + H^+(aq) ----> H2O(l)

The reaction;

OH^-(aq) + H^+(aq) ----> H2O(l) is exothermic hence, if the temperature of the system is increased, the equilibrium position will shift towards the left hand side and the solution turns orange.

Answer:

3.09 M

Explanation:

The reaction that takes place is:

First we calculate how many Ca(OH)₂ moles reacted, using the given volume and concentration:

Then we convert Ca(OH)₂ mmoles into mmoles of acetic acid, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate the molarity of acetic acid, using the number of moles and given volume:

Answer:

The Cell Wall

Explanation:

Answer:

C

Explanation:

Answer:

The density should be 2.8 g/mL.

Explanation:

To solve this problem, we must remember that we find density using the following formula:

Density = mass/volume

Therefore, if we plug in the values we are given in the problem, we get:

Density = 70 g / 25 mL

Density = 2.8 g/mL

Therefore, the correct answer is 2.8 g/mL.

Hope this helps!

Answer:

ee = 96%

Explanation:

Enantiomeric excess, ee, is a way to express a mixture that is not enantiomerically pure. It is defined as 100 times the ratio between the  differences of amounts of enantiomers and the total amunt. that is:

ee = |A-B|/ A+B * 100

ee = |98%-2%| / 98+2 * 100

Answer:

[tex]^{218}_{85}At\rightarrow ^{214}_{83}Bi+^{4}_{2}He[/tex]

Explanation:

Hello there!

In this case, since the radioactive reaction for the alpha emission of astatine-218 to bismith-214 involve the release of a helium atom as shown below:

[tex]^{218}_{85}At\rightarrow ^{214}_{83}Bi+^{4}_{2}He[/tex]

Whereas the atomic number decreases by 2 and the mass number by 4 in agreement to the release of the Helium atom.

Regards!

Vascular tissue

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Cross section of celery stalk, showing vascular bundles, which include both phloem and xylem.

Detail of the vasculature of a bramble leaf.

Translocation in vascular plants

This article is about vascular tissue in plants. For transportation in animals, see Circulatory system.

Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally. There are also two meristems associated with vascular tissue: the vascular cambium and the cork cambium. All the vascular tissues within a particular plant together constitute the vascular tissue system of that plant.

The cells in vascular tissue are typically long and slender. Since the xylem and phloem function in the conduction of water, minerals, and nutrients throughout the plant, it is not surprising that their form should be similar to pipes. The individual cells of phloem are connected end-to-end, just as the sections of a pipe might be. As the plant grows, new vascular tissue differentiates in the growing tips of the plant. The new tissue is aligned with existing vascular tissue, maintaining its connection throughout the plant. The vascular tissue in plants is arranged in long, discrete strands called vascular bundles. These bundles include both xylem and phloem, as well as supporting and protective cells. In stems and roots, the xylem typically lies closer to the interior of the stem with phloem towards the exterior of the stem. In the stems of some Asterales dicots, there may be phloem located inwardly from the xylem as well.

Between the xylem and phloem is a meristem called the vascular cambium. This tissue divides off cells that will become additional xylem and phloem. This growth increases the girth of the plant, rather than it

Answer:

question 1, i'd say not enough information

question 2, do you know of potassium bromine lowers the entropy of the water solution or raises the entropy level? if so entropy is either A or C

question 3, i'd say entropy is less than 0, but i don't know because i never learned this in school

Explanation:

we don't know the original volume of gas and only know the elements that are in it

Answer:

H3PO4

Explanation:

The H3PO4 is an acid as it release H+ ion when dissolved in a solution and H3PO4 is known as phosphoric acid

burning of fossil fuels is the answer

Answer:

burning of fossil fuel

Explanation:

Answer:

V1 = 8.3 mL

Explanation:

Step 1: Given data

Initial volume (V1): ?

Initial concentration (M1): 6.0 M

Final volume (V2): 50.0 mL

Final concentration (M2): 1.0 M

Step 2: Calculate the volume of the initial solution

We want to prepare a dilute solution from a concentrated one. We can calculate the volume of the initial solution using the dilution rule.

M1 × V1 = M2 × V2

V1 = M2 × V2 / M1

V1 = 1.0 M × 50.0 mL / 6.0 M = 8.3 mL

We will take 8.3 mL of the 6.0 M solution and add water until we have 50.0 mL.

Answer:

See explanation

Explanation:

SN2 reaction is a synchronous reaction in which the leaving group departs as the nucleophile is being attached to the substrate in a single step. This makes it imperative to use a good leaving group when carrying out an SN2 reaction such as the one shown in the question.

The addition of a small amount of NaI acts as a sort of external nucleophile which assists the departure of the leaving group thereby enabling the reaction to proceed faster. This occurs because the iodide ion is very good leaving group.

Answer:

Research that releases a poisonous gas into the air.

Explanation:

Since I don't know the options I will guess it is ^

Answer:

16.48 mL.

Explanation:

From the question given above, the following data were obtained:

Initial pressure (P₁) = 1 atm

Initial temperature (T₁) = 0 °C

Initial volume (V₁) = 30 mL

Final temperature (T₂) = 27 ° C

Final pressure (P₂) = 2 atm

Final volume (V₂) =?

Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Initial temperature (T₁) = 0 °C

Initial temperature (T₁) = 0 °C + 273

Initial temperature (T₁) = 273 K

Final temperature (T₂) = 27 °C

Final temperature (T₂) = 27 °C + 273

Final temperature (T₂) = 300 K

Finally, we shall determine the final volume of the gas. This can be obtained as:

Initial pressure (P₁) = 1 atm

Initial temperature (T₁) = 273 K

Initial volume (V₁) = 30 mL

Final temperature (T₂) = 300 K

Final pressure (P₂) = 2 atm

Final volume (V₂) =?

P₁V₁ / T₁ = P₂V₂ / T₂

1 × 30 / 273 = 2 × V₂ / 300

30 / 273 = 2 × V₂ / 300

Cross multiply

273 × 2 × V₂ = 30 × 300

546 × V₂ = 9000

Divide both side by 546

V₂ = 9000 / 546

V₂ = 16.48 mL

Therefore, the final volume of the gas is 16.48 mL.

Answer:

(CH3)2N(CH2)

Explanation:

A hydrogen bond occurs in a molecule when hydrogen is covalently bonded to a highly electronegative atom.

That means that if we are looking for a compound in which there is no hydrogen bonding, we are actually looking for the compound in which hydrogen is not directly linked to an electronegative atom.

If we look at the options carefully, the compound that has such characteristic is only (CH3)2N(CH2) which is a tertiary amine. The nitrogen is directly linked to three alkyl groups and no hydrogen atom hence the molecule does not exhibit hydrogen bonding.

The symbol of the element in which it's ion has 38 protons, 36 electrons, and 40 neutrons is ⁷⁸₃₈Sr

To obtain the symbol of the element, we shall obtain the mass number of the element. This is shown below:

Mass number = Proton + Neutron

Mass number = 38 + 40

Mass number = 78

Finally, we shall determine the symbol of the element. Details below:

From the periodic table, the element with atomic number of 38 is Strontium.

Thus, the symbol of the element will be ⁷⁸₃₈Sr

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Answer:

What's the equation?

Answer:

14.5 g

Explanation:

its true

Answer:

True

Explanation:

hope this helps mate

Answer:

A mixture is matter that can vary in composition. ... A heterogeneous mixture is a type of mixture in which the individual substances are not evenly mixed. Because the substances in a heterogeneous mixture are not evenly mixed, two samples of the same mixture can have different amounts of the substance.

Explanation: