1. What is the function of the circulatory system? * 10 points A. Provide blood with oxygen from the air, & to get rid of carbon dioxide B. Carry oxygen, nutrients, waste, & to fight pathogens C. Secrete hormones to regulate the body and maintain homeostasis D. Produce red blood cells, white blood cells, & platelets

Answer:

the answer is "a" took the test

Explanation:

Answer:

n = 0.223 mol.

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:

[tex]PV=nRT\\\\[/tex]

Thus, by solving for moles we obtain:

[tex]n=\frac{PV}{RT}[/tex]

Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:

[tex]n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol[/tex]

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Answer:

the answer is A

Explanation:

Hopefully u get the answer right

Answer:

A

Explanation:

give me thanks not stars

Answer: The density of kerosene is [tex]2.7g/cm^3[/tex]

Explanation:

Density is defined as the mass contained per unit volume.

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

Given : Mass of kerosene = mass of beaker with kerosene - mass of empty beaker = 60 g - 20 g = 40 g

Volume of kersone = [tex]15cm^3[/tex]

Putting in the values we get:

[tex]Density=\frac{40g}{15cm^3}[/tex]

[tex]Density=2.7g/cm^3[/tex]  

Thus the density of kerosene is [tex]2.7g/cm^3[/tex]

Answer:

There is no picture but the one that is in motion in the picture has kinetic energy.

Explanation:

Kinetic energy is the energy of motion.

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Answer:

Deletion

Explanation:

A mutation refers to a change in the DNA sequence. This means that the original sequence of bases in the DNA has been altered permanently.

There are three types of DNA mutations;  base substitutions, deletions and insertions.

In the particular case of this question, the original is TTCGATA while the copy is TTGATA. If you look closely at the two, you will notice that the C has been omitted. This is an example of  deletion.

Answer: Energy = 10000J - 2000J = 8000J

Therefore, the energy is dissipated the skier moves down to the slope is 8000J

Explanation:

Answer:

HI and I-

Explanation:

Hello there!

In this case, according to the acid ionization of hydroiodic acid:

[tex]HI+H_2O\rightarrow I^-+H_3O^+[/tex]

Now, since the acid, HI, results in the conjugate base, I- and the base, H2O in the conjugate acid, H3O+, it is correct to assert that the acid-conjugate base pair is HI and I-

Best regards!

The acid-conjugate base pair in the reaction above is HI and I-. Details about conjugate base can be found below.

A conjugate base is the substance formed when an acid loses or donates its proton or hydrogen ion.

According to this question, the following reaction is given:

HI + H2O → H30+ + I-

The acid in this reaction is HI while the conjugate base is I-.

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Answer:

carbon electrode: delocalised electrons

molten mixture....: aluminium oxide ions

metal wire: Metal atoms

The free moving charged particles in the following substances are as follows;

Graphite, an allotrope of carbon has Delocalized (free-moving) electrons and these electrons serve to enable conductivity.

Although, cryolite is a bad conductor of electricity, when Molten Aluminium oxide and cryolite is used, the free moving Aluminium ions enable conductivity.

In metal wires, conductivity is solely the responsibility of metal ions.

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Answer:

7.The answer is 2.13 because if u add 3.23 and 4.51 and the answer is 7.74 and u add 2.13 to get 9.87. 3.23 + 4.51 + 2.13 is 9.87

Explanation:

Answer:

55mL

Explanation:

44g / 0.8g/mL = 55mL

Answer:

The volume at STP is 41.3mL

Explanation:

To solve this question we must find the volume using the combined gas law. The equation is:

P1V1 / T1 = P2V2 / T2

Where P is pressure, V volume and T absolute temperature of 1, initial state and 2, final state of the gas.

P1 = 718torr

V1 = 47.9mL

T1 = 26°C + 273.15 = 299.15K

P2 = 760torr at STP

V2 = ?

T2 = 273.15K at STP

Replacing:

718torr*47.9mL / 299.15K = 760torr*V2 / 273.15K

41.3mL = V2

Answer:    1.7x10^-5

Explanation:

pH + pOH = 14

14 - pH = pOH

14 - 9.23 = 4.77

pOH =4.77

[OH-] = 10^-pOH

         = 10^-4.77

         = 1.698243x10^-5

         = 1.7x10^-5

Answer:

I'm pretty sure a lot of them are melting because of global warming

Answer:

1.25 mL/s

Explanation:

Your are told that 25.0 mL of H2 was produced 20 seconds. This is equal to rate 25/20 = 1.25 mL/s

When a reaction progresses, the reactant concentration gradually decreases and the product concentration gradually increases. Here the rate of the reaction is 1.25 mL/s.

The rate of a chemical reaction is defined as the rate of decrease of concentration of a reactant or the rate of increase of concentration of a product. The rate of the reaction is usually expressed in units mol L⁻¹s⁻¹. The rate of the reaction are affected by several factors like concentration of the reactants, temperature, etc.

An equation which expresses the experimentally observed rate of a reaction in terms of the molar concentration of the reactants which determine the rate of the reaction is called rate equation.

Here it is seen that 25.0 mL of H2 was produced 20 seconds. So the rate is given as:

Rate = 25/20 = 1.25 mL/s

Thus the rate of the reaction is 1.25 mL/s.

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Answer:

Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different hydrocarbons condense at their specific boiling points, allowing them to be separated.

Answer:

when they have satisfied the octet rule naturally or through bonding to obtain full valence shells

Explanation:

Generally, most atoms of an element are unstable because they have a void in their electron shell to fill, hence, they need to react with other elements to fulfil this task of octet.

Octet rule states that atoms of elements engage in reactions to form compounds so they can have eight (8) valence electrons in their shell. Noble gases e.g argon, neon etc. are elements that have naturally satisfied this octet rule by possession of 8 valence electrons in their shell. Other elements that do not have this naturally becomes reactive and enter bonding with other atoms to obtain full valence shells.

Answer: CH4 + 1,5 O2 ⇒ CO + 2 H2O, then multiply numbers by 2

Explanation:

Answer:

Beryllium metal is relatively unreactive at room temperature, particularly in its massive form. Magnesium is more electropositive than the amphoteric beryllium and reacts more readily with most of the nonmetals.

Explanation:

When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.

The chemical element magnesium has the atomic number 12 and the letter Mg as its symbol. It is a glossy, gray metal with a low melting point, high chemical reactivity, and a low density. It only naturally occurs in mixtures with other elements, just like the other alkaline earth metals, and it almost always has an oxidation state of +2.

At room temperature, beryllium metal is largely non-reactive, especially in its massive form. Magnesium interacts more quickly with the majority of nonmetals because it is more electropositive than amphoteric beryllium.

Due to the electron being removed being in the 3-level rather than the 2-level and being further away from the nucleus's attraction, the first ionization energy of magnesium is lower than that of beryllium.

Thus, When it comes to the ease with which a positive ion or cation of the metal can form, beryllium is less reactive than magnesium.

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Answer:

190k 100 on the test

Explanation:

Answer: A heat energy of 50160 joules are required to heat 15 grams of ice from [tex]-200^{o}C[/tex] to [tex]1400^{o}C[/tex].

Explanation:

Given : mass of ice = 15 g

Convert grams into kg as follows,

[tex]1 g = 0.001 kg\\15 g = 15 g \times \frac{0.001 kg}{1 g}\\= 0.015 kg[/tex]

Initial temperature = [tex]-200^{o}C[/tex]

Final temperature = [tex]1400^{o}C[/tex]

Formula used to calculate the amount of heat energy is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat of substance (ice here has C = [tex]2090 J/kg ^{o}C[/tex])

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

Substitute the values into above formula as follows.

[tex]q = m \times C \times (T_{2} - T_{1})\\= 0.015 kg \times 2090 J/kg^{o}C \times [1400 - (-200)]^{o}C\\= 50160 J[/tex]

Thus, we can conclude that 50160 joules are required to heat 15 grams of ice from [tex]-200^{o}C[/tex] to [tex]1400^{o}C[/tex].

Answer:

Due its storing and holding ability.

Explanation:

It matter that the material from which the vat is made is metal because this vat is used for storing and holding liquids. Vat is a large container or tank that is used for storing or holding liquids in industrial sector. This vat is made of metal which increases its strength and durability. If the vat is made of wood or plastic so it can't hold huge amount of liquid or chemical due to its weak material so that's why it matters that the substance from which the vat is made is metal or not.

Answer:

1.08827 x 10^3 g.

Explanation:

The equation for the reaction is:

2LiOH + CO2  ---->  Li2CO3 +  H2O

Using the molar masses:

CO2 = 12.011 + 2* 16 = 44.011.

LiOH = 6.94 + 1.008 + 16 = 23.948

S0 44.011 of CO2 reacts with  2*23.948 g of LiOH

1.00 *10^3 g CO2 reacts  with   2*23.948 * 1.00 *10^3 / 44.011

= 1088.27 g LiOH.

Answer:

This is polar

Explanation:

If the arrows are of different lengths, and if they do not balance each other, the molecule is polar.

If the arrangement is asymmetrical, the molecule is polar.

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Answer:

Now, the molar solubility of lead(II) phosphate in water is said to be equal to 6.2⋅10−12mol L−1 . This means that in one liter of water, presumably at room temperature, you can only hope to dissolve 6.2⋅10−12 moles of lead(II) phosphate.

Explanation:

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