CHEMISTRY HIGH SCHOOL

1. Gas Formula Helium He Methane CHA Oxygen 0₂ Nitrogen N₂ Chlorine Cl₂ Relative atomic or molecular mass 4 ,16, 32 ,28 ,71 Look at the table and answer the following questions. (a) Which two gases will mix fastest? (b) Which gas will take least time to escape from gas syringe? (c) Which gas will diffuse slowest and why? Or (c) An unknown gas diffuses faster than 0₂ and slower than N₂, what can you about its molecular mass?

Answers

Answer 1

Answer:

Answer:

Explanation:

a) this is for the gases with lowest molecular mass meaning they are light and so move faster and so mix faster

b) The gas taking least time will be Cl2 as it is the heaviest gas and so moves the slowest

c) Same its Cl2 and same reason

d) This will be lighter than oxygen but heavier than nitrogen

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Which of the following about sodium atoms(Na) is NOT correct?1. All neutral sodium atoms have 11 protonsand 11 electrons.2. All sodium atoms have the atomic number11.3. All sodium atoms have the same numberof protons.4. All sodium atoms have 11 neutrons.5. All atoms with atomic number 11 aresodium atoms.
For the reaction C5H5N(aq) + H2O(l) C5H5NH+(aq) + OH-(aq), which of the following is a conjugate acid-base pair? a. C5H5N, C5H5NH+b. C5H5NH+, OH-c. H2O, OH-d. C5H5N, H2O
How many moles of NaNO, would you need to make 500 mL of a 2.5 Msolution of NaNO?

The process in which a substance changes from a gaseous state to the liquid state is

Answers

The process in which a substance changes from a gaseous state to a liquid state is condensation

hope this helps!!!

Answer:

Condensation is the change of state from a gas to a liquid

1.11g of methane CH4 is burned in a bomb calorimeter containing 1000 grams of water. The initial temperature of water is 24.85 degrees Celsius. The specific heat of water is 4.184 J/g degrees Celsius. The heat capacity of the calorimeter is 695 J/degrees Celsius. After the reaction the final temperature of the water is 35.65 degrees Celsius. Calculate the heat absorbed by the water. Then calculate the heat absorbed by the calorimeter.

Answers

Given:
M methane = 1.11g CH4
M calories = 1000g or g of H2O
C heat capacity = 4.184 J/g °C of H2O
C heat capacity = 695 J/°C
Ti = 24.85 °C
Tf = 35.65 °C

Ask: ΔH = ?
Formula: q=mCΔT
= (1000 g) (696 J/°C) (10.8°C)
= 7506000 J H2O (endothermic) release heat

q reaction = -q calorimeter
= -7506000 J = ΔH

What happens in a chain reaction

Answers

Answer: Neutrons released act as reactants in next reaction.

Explanation:

Nuclear chain reactions occur in fission reactions only. Nuclear fission reactions are defined as the reactions in which larger nuclide splits into two or more smaller daughter nuclides.

In nuclear chain reaction, the neutrons that are released in the previous fission reaction act as the starting material in the next reaction. Thus, this process continues to many reactions and hence, is known as nuclear chain reaction.

For Example: Uranium-235 on bombardment of 1 neutron undergoes fission reaction producing 3 neutrons and a huge amount of energy. The reaction follows:

$_(92)^(235)\textrm{U}+_0^1n\rightarrow 3_0^1n+_(36)^(92)\textrm{Kr}+_(56)^(141)\textrm{Ba}+\text{energy}$

Hence, neutrons released act as reactants in next reaction.

Hi there! A nuclear fission is a chain reaction. What happens in a food chain is that a uranium-235, which is a atom absorbs a neutron, and then it fissions into two new atoms. Which then releases three new neutrons and a lot of binding energy.

Enzymes are proteins that speed up chemical reactions in the body how do they workA. they increase the surface area of reactants
B.they increase the concentration of reactants
C.they decrease the concentration of products
D. They act as reactants

Answers

The answer would be D, Enzymes are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason enzymes are sometimes called biological catalysts.

Answer:

D) They act as reactants

Explanation:

I took the test.

Hope this helps!!

Which statement about subatomic particles is true?Protons are the only subatomic particles to have charge.
Electrons are the subatomic particles with the smallest mass.
Neutrons orbit the nucleus of the atom.
Subatomic particles all have the same mass.

Answers

The second option - electrons are the subatomic particles with the smallest mass.

Both protons and electrons have charge (protons are positive and electrons are negative)

Protons and neutrons both equal 1 amu (atomic mass unit), whereas electrons weigh about 1/1000 amu

Electrons orbit around the nucleus, whereas protons and neutrons are inside of the nucleus

And for the last option, I already answered it

Answer:

The second option - electrons are the subatomic particles with the smallest mass.

Explanation:

The atomic number is the _____. atomic mass number of neutrons protons plus the neutrons number of protons

Answers

The atomic number of an atom is determined by the number of protons present in the atom that is the atomic number and number of protons are same for an atom. It is unique for every atom.

Atomic mass: It is nearly equals to the sum of mass of subatomic particles present in the atom that is sum of proton and neutron.

Number of neutrons: in an atom, the number of neutrons are always equal to the number of protons. If the number of neutrons are different for a number of proton then it is said be an isotope of that atom.

Protons plus neutrons: Sum of number of protons and number of neutrons is said to be the mass number of that atom.

Hence, the atomic number is the number of protons.

It's the number of protons.
The table of elements organizes the elements by their number of protons/the atomic number as the number of protons of an element is fixed, unlike the number of electrons and neutrons.

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