CHEMISTRY HIGH SCHOOL

Determine the new temperature when the volume a gas at 1.56L and 20.0 ˚C changes to 2.02L. Please show work

Answers

Answer 1

Answer:

Answer:

T₂ = 379.4 K

Explanation:

Given data:

Initial volume = 1.56 L

Initial temperature = 20°C (20+273 = 293 K)

Final volume = 2.02 L

Final temperature = ?

Solution:

The given problem will be solve through the Charles Law.

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₂ = V₂T₁ /V₁

T₂ = 2.02 L × 293 K / 1.56 L

T₂ = 591.86 L.K / 1.56 L

T₂ = 379.4 K

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Which compound contains both ionic and covalent bonds?(1) ammonia
(2) methane
(3) sodium nitrate
(4) potassium chloride

Answers

Answer is (3)- Sodium Nitrate.

Normally ionic bonds can be seen betweenmetals and non-metals while covalentbonds present betweennon-metals. Another thing that determines the bond nature is electronegativityvalue of the atoms.If the electronegativity differenceis high, then that bond tends to be an ionic bond.

Sodium nitrate consists of Na⁺ and NO₃⁻ ions. Hence, the bondbetween Na⁺ and NO₃⁻ is an ionicbond.

NO₃⁻ is made from N and O. Both are non-metallicatoms. The electronegativities of N and O are 3.0 and 3.5 respectively. Hence, there is nobig difference betweenelectronegativity values (3.5 - 3.0 = 0.5). Hence, the bondbetween N and O is a covalentbond.

Compound (3) sodium nitrate contains both ionic and covalent bonds.

Compound (3) sodium nitrate contains both ionic and covalent bonds. Sodium nitrate consists of the ions Na+ and NO3-, where the bond between Na+ and NO3- is predominantly ionic, and the bond within the NO3- ion is covalent. The sodium ion (Na+) donates an electron to the nitrate ion (NO3-), resulting in an ionic bond. However, within the nitrate ion, the nitrogen (N) and oxygen (O) atoms share electrons, forming covalent bonds.

Learn more about compound here:

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All scientists observing the same event will record identical descriptions.

Answers

TRUE OR FALSE
always find the important keyword in this case IDENTICAL which means: similar in every detail; exactly alike.
FALSE because scientists all have different ways of thinking and they might observe things from a different perspective.

Answer:

FALSE

Explanation:

i got it right

Why is H2SO4 regarded as an ampholyte

Answers

I think sulfuric acid cannot be regarded as an ampholyte. Ampholytes are amphoteric molecules or that contains both acidic and basic groups. An amphoteric compound can react both as an acid and a base which sulfuric acid is not capable.

The bacteria that causes a disease is called a(n)A. Pathogen
B. Pandemic
C. Epidemiology
D. Toxicology

Answers

The answer is A

The bacteria that cause disease are known as pathogens. The term pathogen is used to refer to all types of disease causing microorganisms. These include bacteria, fungi, protozoa and fungi.

Bacteria. Microscopic organisms that come in many shapes and sizes. Some bacteria that cause disease in man are Salmonella typhi which causes typhoid and Streptococcus pyogens which causes sore throat.

Virus. A virus is a microscopic entity much smaller than even bacteria and can only exist inside a host such as a cell. It cannot live on its own. Some viruses that cause disease are HIV which causes AIDS and Rhino virus which causes colds.

Fungi. These are a group of unicellular or multicellular microscopic organisms that live by feeding on organic matter. A type of fungus that causes disease is Trichophyton mentagrophyte which is responsible for athlete's foot.

Protozoa. A group of one celled organisms which live in water. Entamoeba histolytica is a protozoa, an amoeba which causes amoebic dysentery in man.

Which type of radiation is identical in mass and charge to a helium nucleus?a. beta
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d. positron

Answers

The best answer to the question 'Which type of radiation is identical in mass and charge to a helium nucleus?' would be letter b. Alpha radiation is similar to the mass and charge to a helium nucleus. An alpha particle has two protons and two neutrons.

Answer:

The correct answer is b.

Explanation:

Alpha particles are fully ionized helium (4He) nucleus. These nucleus consist of two protons and two neutrons. They are positively charged (+2) due to the absence of electrons. It has the same mass as the He atom (6,64 * $10^(-27)$ kg) or (4 uma), and the same charge (3,2 * $10^(-19)$ C).

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Sodium chloride, NaCl forms in this reaction between sodium and chlorine. 2Na(s) + Cl2(g) → 2NaCl(s) How many moles of NaCl result from the complete reaction of 3.9 mol of Cl2? Assume that there is more than enough Na.