Help 15 points!!!
Complete the following combustion reaction.

The final temperature :T₂=411.125 K = 138.125 °C

Given

T₁=-20 °C+273 = 253 K

V₁=40 ml

V₂=65 ml

Required

Final temperature

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

Input the value :

T₂=(V₂.T₁)/V₁

T₂=(65.253)/40

T₂=411.125 K = 138.125 °C

Answer:

7.88g/mL is density of iron

Explanation:

As water and iron are insoluble, the volume of displaced fluid (Water) is equal to the volume of the solid (Iron). That means volume of the iron is:

24.19mL - 23.20mL = 0.99mL is the volume of iron

As density is the ratio between mass -7.8g- and volume of a compound -0.99mL- the density of iron is:

7.8g / 0.99mL =

Answer:

Gases have three characteristic properties: (1) they are easy to compress, (2) they expand to fill their containers, and (3) they occupy far more space than the liquids or solids from which they form.

Explanation:

Answer:

Mass of hydrogen gas produced = 0.2 g

Explanation:

Given data:

Number of moles of Mg = 0.2 mol

Number of moles of HCl = 0.2 mol

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Mg + 2HCl       →     MgCl₂ + H₂

Now we will compare the moles of of hydrogen with Mg and HCl.

                   Mg          :        H₂

                    1             :         1

                   0.2          :       0.2

                 HCl           :       H₂

                   2             :         1

                0.2            :         1/2×0.2 = 0.1

HCl produced less number of moles of hydrogen gas it will act as limiting reactant.

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.1 mol × 2 g/mol

Mass = 0.2 g

Answer: 64

Explanation:

Answer:

64

Explanation: add 6 to 58 and you get 64.

Answer:

Helium

He

atomic number 2.

It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas,

Explanation:

These different types of helium atoms have different masses (3 or 4 atomic mass units ), and they are called isotopes. For any given isotope, the sum of the numbers of protons and neutrons in the nucleus is called the mass number. This is because each proton and each neutron weigh one atomic mass unit (amu). By adding together the number of protons and neutrons and multiplying by 1 amu, you can calculate the mass of the atom. All elements exist as a collection of isotopes. The word ‘isotope’ comes from the Greek ‘isos’ (meaning ‘same’) and ‘topes’ (meaning ‘place’) because the elements can occupy the same place on the periodic table while being different in subatomic construction.

For part of our orbit the northern half of Earth is tilted toward the Sun. This is summer in the northern hemisphere; there are longer periods of daylight, the Sun is higher in the sky, and the Sun's rays strike the surface more directly, giving us warmer temperatures.

Answer:

the sun is further away

Explanation:

ignore

The coefficient of Ni+ in this reaction is 1 and that of C₄H₈N₂O₂  is 2 and the coefficient of the product Ni(C₄H₈N₂O₂ )₂ is 2. Hence option A 1,2,1 is correct.

A balanced reaction is represented by a chemical equation where all reactants and products are correct stoichiometry and their states are represented in brackets.

In a balanced chemical equation, each element have to equal in number on both side. For example, if there four oxygen in the reactant side then the product side must have four oxygens.

If the number is not equal we can balance them by multiplying with simple integers. These numbers are called coeffcients.

In the given reaction there are one nickel in both side but two C₄H₈N₂O₂ are there in the product side. Therefore we must multiply 2 for C₄H₈N₂O₂ in the reactant side.

Hence, we get the coefficient for C₄H₈N₂O₂  in reactant side 2 and in the product side for the nickel complex 1.Thus, option a 1,2,1 is correct.

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The average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.

The average distance between molecules of gaseous substance is greater than the average distance between molecules of liquid and solid substance.

The molecules of the gaseous substances always move with greater speed due to large distance between the molecules.

The molecules of a solid substance are closely packed together and this reduces the average speed of the molecules.

Nitrogen gas (N₂) is a gaseous substance while sodium chloride (NaCl) is a solid substance.

Thus, we can conclude that the average vibrational energy of nitrogen gas (N₂) at 22 c be greater than the average vibrational energy of NaCl at 22 c.

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Answer:

and your probably with that blond girl who always me

doubt she so much older than me she's every thing i'm in insecure about

Explanation:

Answer: and all my friends are tired of hearing how much i miss you but i kinda feel sorry for them cause they'll never know you the way i do , yea today i drove through the suburbs and pictured i was driving home to you.

Explanation:

Answer:

D. It is supported by adequate data

Explanation:

A theory is a well-substantiated explanation

Hope this helps!

Have a great day. :)

Answer:

hello the options related to your question is missing hence I will give you a general answer as regards to combination of atoms in a chemical reactions

answer :

In a chemical reaction the bonds that are found between the atoms of reactants are broken up and a different/new bonds are formed between the atoms of the various reactants involved in the chemical reaction to produce a new product.   during this process no new atoms are created but new bonds are created  to form a product

Example of such substance where atoms can combine together in a chemical reaction is : Iron sulfide  [ Fe(s) + S(s) → FeS(s) ]

Explanation:

In a chemical reaction the bonds that are found between the atoms of reactants are broken up and a different/new bonds are formed between the atoms of the various reactants involved in the chemical reaction to produce a new product.   during this process no new atoms are created but new bonds are created  

Example of such substance where atoms can combine together in a chemical reaction is : Iron sulfide  [ Fe(s) + S(s) → FeS(s) ]  i.e. combination of Iron atoms and sulfur atoms

0.9 mol KMnO

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

100 g KMnO

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Molar Mass of Mn - 54.94 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of KMnO - 39.10 + 54.94 + 16.00 = 110.04 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

0.90876 mol KMnO ≈ 0.9 mol KMnO

Answer:

991.997

Explanation:

Answer:

210 m in 3 sec

Explanation:

The speed of the Cheetah is given to be 70m/s .

   We know that:

         Speed  = [tex]\frac{distance }{time}[/tex]  

Now we find the choice that gives 70m/s:

480 m in 6 sec

          Speed  = [tex]\frac{480}{6}[/tex]   = 80m/s

600 m in 10 sec

           Speed  = [tex]\frac{600}{10}[/tex]   = 60m/s

210 m in 3 sec

            Speed  = [tex]\frac{210}{3}[/tex]   = 70m/s

300 m in 5 sec

          Speed  = [tex]\frac{300}{5}[/tex]    = 60m/s

So the solution is 210 m in 3 sec

Answer:

0.4m/s²

Explanation:

Given parameters:

Mass of student = 50kg

Force  = 20N

Unknown:

Acceleration = ?

Solution:

From Newton's second law of motion,

          Force  = mass x acceleration

   Acceleration  = [tex]\frac{Force }{mass}[/tex]   = [tex]\frac{20}{50}[/tex]    = 0.4m/s²

Answer:

A. An identification of the atoms in a molecule

Explanation:

The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.

Therefore, a chemical formula allows us to identify atoms that are within a molecule.

A molecule is a covalent compound that has discrete or separate units.

For example;

         HCl represents 1 mole of hydrogen chloride molecules consisting of 1 mole of hydrogen atoms and 1 mole of chlorine atoms.

Answer:

Yes.

Explanation:

Electric charge cannot change the elemental composition of a substance.

The application of charge to the aluminium foil does not change the composition of the foil and hence the foil will still be made up of aluminium atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

E) 1.56x10⁴g

Explanation:

Pounds and grams are both units of mass. Pounds are used in UK and USA. Grams is the unit of mass used in the international system of units, SI.

To convert pounds, lb, to grams, g, we need the equivalence between these 2 units of mass:

1lb = 453.6g

That means 1lb weighs 453.6g. 34.4lb weigh:

34.4lb * (453.6g / 1lb) = 1.56x10⁴g. That means right option is:

Answer:83.3 (kg*m)/s^2

Explanation:weight is the combination of the mass of an object and the gravitational force on it.

Weight=mass (kg) * gravity

Gravity=9.8 m/s^2

Weight= (8.5 kg)*(9.8 m/s^2)

There are 83.3N of weight in an object of mass 8.5 kg.

HOW TO CALCULATE WEIGHT:

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Answer:  Hydrogen that is not used in balloons because hydrogen burns very easily.

pls mark brainliest

Answer:

3

Explanation:

jdidsolslwoekdldloeo we

Answer:

what's the question man

Explanation:

Answer:

It is a metal

Explanation:

One of the properties of metals is that metals are malleable. What we mean by malleability is that the metal can be hammered into sheets that can be used for different applications.

Also, metals can react with chlorine when heated to yield diverse halides. This is true of most metal elements.

Answer: atomic mass

Explanation:

Mass Number. The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. The mass of the atom is a unit called the atomic mass unit (amu).

Answer:

Yttrium, Silver,Iron,Nickel and Copper I believe