Chemistry High School

Mark brainly if answered correctly

Answers

Answer 1

ROW - ( 3 ) is correct

SYSTEM (A)

Respiratory system - here gaseous exchange takes place.

SYSTEM (B)

Digestive system - here nutrients from food is absorbed and assimilated .

SYSTEM (C)

Excretory system - removal of waste occurs

Related Questions

Which is NOT an application of chemistry to life? *

a. Fertilizers used by farmers

b. Soaps used to clean

c. Medicine used by doctors

d. Hammer used by construction worker

Answers

I’m pretty sure it’s D

Which set of elements represents a period within the Periodic Table?

H, He, Ar , Xe , Rn ,

N, P, As, Sb , Bi

K, V, Fe, Ga , Kr

La, Pa, Sm, Tb, Yb

Answers

Which set of elements represents a period within the Periodic Table?

H, He, Ar , Xe , Rn ,

N, P, As, Sb , Bi

K, V, Fe, Ga , Kr

La, Pa, Sm, Tb, Yb Which set of elements represents a period within the Periodic Table?

H, He, Ar , Xe , Rn ,

N, P, As, Sb , Bi

K, V, Fe, Ga , Kr

La, Pa, Sm, Tb, Yb

Plants and animals both use the process of _____ to release stored energy.

Answers

Answer:

The sun.

Explanation:

Sun is the ultimate source of energy. All living things on the earth using the energy comes from the sunlight.

Plants using sunlight to fuel the process of photosynthesis. Photosynthesis is the process of transforming of water and carbon dioxide to oxygen and glucose. The amount of energy used to drive the photosynthesis process is stored in the glucose molecules.

Organism feed on plants and breaking down the glucose molecules to release the stored energy. The release energy is utilized by the cells present in the organisms.

Autotrophs also have the ability to make their own food, so they are also using the energy from the sun to make their food.

science:my chosen place is bonifacio global city
i choose this place because?

Answers

Answer:

Rewrite the following sentence in reported speech

The chair person said,"A hearty welcome to all present!"

What is the atomic number of an atom? Why is this number important?

Answers

The number of protons in an atom is called its atomic number. This number is very important because it is unique for atoms of a given element. All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms

Your friend sits on a 25.0L exercise ball, squishing the ball so that it is only 17.5L. What is the pressure inside the ball if the outside air pressure is 100. kPa?

Use the Boyle's Law equation to determine the answer.

Answers

Answer:

Explanation: because i took the test and got a 100

If 190dm of hydrogen gas collected at 20°c and 760mmHg .Calculate it's volume at stp (standard pressure=760mmHg

Answers

Answer:

177.1 L

Explanation:

The excersise can be solved, by the Ideal Gases Law.

P . V = n . R . T

In first step we need to determine the moles of gas:

We convert T° from, C° to K → 20°C + 273 = 293K

We convert P from mmHg to atm → 760 mmHg = 1atm

1Dm³ = 1L → 190L

We replace: 190 L . 1 atm = n . 0.082 . 293K

(190L.atm) / 0.082 . 293K = 7.91 moles.

We replace equation at STP conditions (1 atm and 273K)

V = (n . R .T) / P

V = (7.91 mol . 0.082 . 273K) / 1atm = 177.1 L

We can also make a rule of three:

At STP conditions 1 mol of gas occupies 22.4L

Then, 7.91 moles will be contained at (7.91 . 22.4) /1 = 177.1L

A sample of an unknown liquid has a volume of 12.0 mL and a mass of 6 g. What is its density?

A. 2 g/cm3
B. 0.5 g/cm
C. 5.0 g/cm3
D. 0.2 g/cm3

Answers

[tex]\large \mathfrak{Solution : }[/tex]

volume = 12 ml = 0.012 litres = 0.012 cm³

mass = 6 g

And the relationship between mass, volume and density can be depicted by :

[tex] \boxed{density = \dfrac{mass}{volume} }[/tex]

[tex]density = \dfrac{6}{0.012} [/tex]

[tex]density = \dfrac{6000}{12} [/tex]

[tex]density = 500 \: \: g/cm {}^{3} [/tex]

therefore, density = 500 g/cm³

The thermal energy of matter increases when ___.

A. Heat flows of the matter
B. The mass of the matter decreases
C. Heat flows into the matter
D. The temperature decreases

Answers

A. heat flows of the matter is what i would put

What is represented by this notation?

Na loses one proton to Cl.
Na loses one electron to Cl.
Na gains two protons from Cl.
Na gains one electron from Cl.

Answers

Answer:

it's the third

Explanation:

I need to fill 20 spaces. don't mind that

Answer:

Na gains two protons from Cl.

Explanation:

this should help

Which type of stoichiometry problems does not require the use of molar mass?

Answers

Answer:

Explanation:

It is volume-volume problems that does not require the use of molar mass.

What is one way that the kidneys help maintain homeostasis in the body?
A They regulate the temperature of the body
B They regulate the distribution of energy in the body
C They regulate the amount of oxygen in the body
D They regulate the amount of water in the body

Answers

Answer:

they regulate the amount of water in the body.

Explanation:

The kidneys help maintain homeostasis by regulating the concentration and volume of body fluids. For example, the amount of H+ and HCO3 - secreted by the kidneys controls the body's pH.

What are the chemical reactions involved in CO2 emission?

Answers

In co2 there’s combustion because it comes from burning fossil fuels

Find the final product for: Li + Br and show work.

Answers

Lithium is atomic number 3, so it has valency 1

While, Bromine is atomic number 35, and has valency 1

Lithium has an extra electron while Bromine need an electron, since they both need and have one electron, the form

LiBr (Lithium Bromide) where Li is +ve charged and Br is -ve charged

Happy to help :)

Helllpppppppppppppppppppp

Answers

Answer:

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Explanation:

21.82 L of 4.65 M HCl is added to 9.31 L of 8.55 M NaOH. What is the concentration of HCl in the resulting solution? **hint: make ICE table

A)1.90 M

B)0.952 M

C)10.3 M

D)0.702 M

E)0.644 M

Answers

Answer:

Explanation:

First you multiply 4.65 with 21.82 to get the mols of hcl, which is 101.463. Then you make an ice table. The ice table should look like this:

HCl + NaOH = 12NaCl + H2O

101.463 6.022e23 1.989e30

As the ice table above shows, you will have 1.989e30 mols of nacl after the reaction. With that information, you can then divide it by 2.833333333333333e30 to get 0.702 M.

is copper an elementary substance or a compound?

Answers

Elementary substance

5 Protons {+}
5 Electrons {-}
6 Neutrons {0}
What element is this ?

Answers

Answer:boron

Explanation:

What processes contribute water to surface water sources?(science)

Answers

Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. Although the total amount of water within the cycle remains essentially constant, its distribution among the various processes is continually changing.

NH₄⁺(aq)+NO₃⁻(aq) → NH₄NO₃(s)
How much energy is released when 3 moles of NH₄+ react?

1) -25.69 kJ
2) -51.38 kJ
3) -77.07 kJ
4) -102.76 kJ

Answers

I think the answer is number 3

A solution's hydrogen ion concentration is 1 x 10-SM.
What is the pH?

Answers

Answer:

the Ph is

Explanation:

90rn hub

Ayúdenme por favor
Please help me

Answers

The answers are;
2H2+O2===>2H2O
N2+3H2==>2NH3
C3H8+5O2==>4H20+3CO2
CH4+2O2===>CO2+2H2O
2HBr +Fe==>FeBr2 +H2
I hope it helped

For a solution, [H+] = 1 x 10-2M.
What is the pH?

Answers

Answer:

pH=2

Explanation:

-log(1 x 10-2)=2

An element A has an atomic number of 11 and another element B has an atomic number 17 (A
and B are not actual chemical symbols of elements)
i. What group on the periodic table does A belong?
ii. What type of bond will be formed between A and B? Explain.
(2mks
(1ml
iii.
Write the formula of the compound that will be formed between A and B.
(lm
b. Arrange the species X, X5+ and X. in order of increasing size.

Answers

Answer:

can anyone tell me how to get +7!67:$'!$

10 moles of potassium hydroxide in 5.16 L of solution

Answers

Answer:

The molarity is 8.52M

Explanation:

molality = moles of solute/kg of solvent = 5.2mol/kg

moles of solute = 5.2mole

mass of solute = moles of solute × MW = 5.2 × 56.106 = 291.8g

mass of solvent = 1kg = 1000g

Mass of solution = mass of solute + mass of solvent = 291.8g + 1000g = 1291.8g

Density of KOH = 2120g/L

Volume of solution = mass/density = 1291.8/2120 = 0.61L

Molarity = number of moles of solute/volume of solution = 5.2/0.61 = 8.52M

The concentration in the solution is 1.94 mol/L

From the question,

We are to determine the concentration of 10 moles of potassium hydroxide in 5.16 L of solution.

From the formula

Number of moles = Concentration × Volume

Then, we can write that

[tex]Concentration = \frac{Number\ of\ moles}{Volume}[/tex]

From the question,

Number of moles of potassium hydroxide (KOH) = 10 moles

Volume of solution = 5.16 L

∴ Concentration of the solution = [tex]\frac{10}{5.16}[/tex]

Concentration of the solution = 1.94 mol/L

Hence, the concentration in the solution is 1.94 mol/L

Learn more here: https://brainly.com/question/19196652

Here is the complete question:

Calculate the concentration in each of the following solutions:

1. 10 moles of potassium hydroxide in 5.16 L of solution

Help plzzZZZZ I really need help with this

Answers

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Please help me classify properly.

Answers

Answer:C

Explanation:

Homogeneous Mixture

Answer:

homogeneous mixture

Explanation:

it is the same throughout so therefore it can be separated

Please help!!
The diagram shows the electron configuration of an atom of an element for the electrons in the s and p orbitals.
What is the group number of the element in the periodic table?

A) 1
B) 2
C) 13
D) 15

Answers

Answer:

Explanation:

because since the outer shell has 5 electron then add 5 and 10 to get 15

What is the speed of a bird that flies 25 meters in 25 minutes?

Answers

Answer:

1mpm(1 meters per minute) Explanation: Speed:Distance/time 25/25=1 plz mark as brainliest

Answer:

1mpm(1 meters per minute)

A solute can be obtained from a solution by...

Answers

Answer:

Evaporating the solvent

Explanation:

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