Earth's southern hemisphere generally experiences colder temperatures in
July than it does in January. Which statement explains why?
O A. The southern hemisphere is tilted away from the Sun in January.
O B. Sunlight strikes the southern hemisphere at a more direct angle in
July.
O C. The Sun produces more energy in June, July, and August than it
does in December, January, and February.
D. Sunlight in the southern hemisphere is more spread out in July.

Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree celsius of one gram of a substance. Therefore, the initial temperature of water is  27.0°C.

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

Enthalpy=mass of solution× specific heat capacity of solution ×Change in temperature.

Enthalpy=1000 J

mass of water=0.05kg

Change in temperature=50-initial

specific heat capacity of solution=4.2

Substituting all the given values we get

1000 J= (0.05kg)(4.2)(50-initial)

initial temperature= 27.0°C

Therefore, the initial temperature of water is 27.0°C.

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Answer:

attractive force

Explanation:

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Answer:

energy flow and nutrient cycles ( photosynthesis , food webs, decomposition webs) sediment transport and soil formation. the water cycle. reproduction/ regeneration mechanisms.

Answer:

68133080.02 g

Explanation:

I believe that the question is to find the mass of air in the room and not the molar mass of air since the molar mass of air was already given in the question as 28.97 g/mol.

Now, if 1 mole of a gas occupies 22.4 L

x moles of air occupies 52,681,428.8 Liters

x = 1 * 52,681,428.8 /22.4

x = 2351849.5 moles of air

Now, number of moles = mass/ molar mass

but molar mass = 28.97 g/mol

2351849.5 = mass/28.97

mass = 2351849.5 * 28.97

mass = 68133080.02 g

a. volume of NO : 41.785 L

b. mass of H2O : 18 g

c. volume of O2 : 9.52 L

Given

Reaction

4 NH₃ (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (l)

Required

a. volume of NO

b. mass of H2O

c. volume of O2

Solution

Assume reactants at STP(0 C, 1 atm)

Products at 1000 C (1273 K)and 1 atm

a. mol ratio NO : O2 from equation : 4 : 5, so mo NO :

[tex]\tt \dfrac{4}{5}\times 0.5=0.4[/tex]

volume NO at 1273 K and 1 atm

[tex]\tt V=\dfrac{nRT}{P}=\dfrac{0.4\times 0.08206\times 1273}{1}=41.785~L[/tex]

b. 15 L NH3 at STP ( 1mol = 22.4 L)

[tex]\tt \dfrac{15}{22.4}=0.67~mol[/tex]

mol ratio NH3 : H2O from equation : 4 : 6, so mol H2O :

[tex]\tt \dfrac{6}{4}\times 0.67=1[/tex]

mass H2O(MW = 18 g/mol) :

[tex]\tt mass=mol\times MW=1\times 18=18~g[/tex]

c. mol NO at 1273 K and 1 atm :

[tex]\tt n=\dfrac{PV}{RT}=\dfrac{1\times 35.5}{0.08206\times 1273}=0.34[/tex]

mol ratio of NO : O2 = 4 : 5, so mol O2 :

[tex]\tt \dfrac{5}{4}\times 0.34=0.425[/tex]

Volume O2 at STP :

[tex]\tt 0.425\times 22.4=9.52~L[/tex]

Answer:

Calculate it, times 6.022

Answer:

In a formula unit of mg (OH)2, there are one magnesium ion and two hydroxide ions, or one magnesium, two oxygen, and two hydrogen atoms

Answer:

20 atoms

Explanation:

Answer:

The formula is Na2C2O4

Explanation:

I hope this helps

Explanation:

CH₃CH₃ + Cl₂ → CH₃CH₂Cl + HCl

Option which is NOT correct is

Option A (It's not an elimination reaction)

Therefore,

Option A is correct✔

Answer:

d-the reaction released large amounts of energy when nuclei split apart

Explanation:

no explain

Answer:

4 moles of HCl are produced.

Explanation:

Given data:

Mass of hydrogen = 4 g

Number of moles of HCl = ?

Solution:

H₂ +  Cl₂   →    2HCl

Number of moles of hydrogen:

Number of moles = mass/molar mass

Number of moles = 4 g/2 g/mol

Number of moles = 2 mol

now we will compare the moles of hydrogen and HCl.

                 H₂        :        HCl

                  1          :          2

                  2         :         2/1×2 = 4 mol

Thus, 4 moles of HCl are produced.

Answer:

I am explain you in image

Answer:

In the laboratory, sulphur dioxide is prepared by the reaction of metallic sulphite or a metallic bisulphite with dilute acid.

Explanation:

For example, a reaction between the dilute sulphuric acid and sodium sulphite will result in the formation of SO2. 2.

Answer:

ok

Explanation:

Answer:

The answer is B and D.

Explanation:

prove me wrong

Answer: b an d

Explanation:

Answer:

(a) because they are not being mixed

From the following given options, the picture showing the mixture of elements is Picture (a) i.e, Mixture of O₂ and N₂.

In chemistry, a mixture is a material made up of two or more different chemical substances which are not chemically bonded.

A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

Therefore, From the following given options, the picture showing the mixture of elements is Picture (a) i.e, Mixture of O₂ and N₂.

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Answer:

125cm^3

Explanation:

A cube has a side that is 5cm long, and a cube has all even sides. To determine the volume, you need to multiply the length, width, and height. Because all these numbers are 5, you do 5*5*5, or 5^3 power, which is 125

Answer:

10000 g BaNO₃

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

3.02 × 10²⁵ formulas units BaNO₃

Step 2: Identify Conversions

Avogadro's Number

Molar Mass of Ba - 137.33 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of BaNO₃ - 137.33 + 14.01 + 3(16.00) = 199.34 g/mol

Step 3: Convert

[tex]3.02 \cdot 10^{25} \ formula \ units \ BaNO_3(\frac{1 \ mol \ BaNO_3}{6.022 \cdot 10^{23} \ formula \ units \ BaNO_3} )(\frac{199.34 \ g \ BaNO_3}{1 \ mol \ BaNO_3} )[/tex] = 9996.79 g BaNO₃

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

9996.79 g BaNO₃ ≈ 10000 g BaNO₃

Answer:

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Explanation:

Answer:

P4O10 + 6H2O → 4H3PO4

so 1,6,4

The balanced equation is :

                                P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.

The unbalanced equation is -

                              P₄O₁₀ + H₂O ⇒ H₃PO₄

There are 4 P on the reactant side, to balance P atom we need to add P on the product side also.

                             P₄O₁₀ + H₂O ⇒ 4 H₃PO₄

To balance the O atom on both sides, add coefficient 6 in front of water and this gives the balanced equation is written as -

                              P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄

Therefore,

The balanced equation is :

                                P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄

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Answer:

Energy of an electron is quantinized means the electrons can possess only specific individually separated values.

These energy levels are stable and are stationary along with different energy value.  The electron remains in the state until energy is absorbed or released.

The electrons absorb energy when it moves from lower energy state to higher energy state. The electrons lose energy when it moves from higher energy state to lower energy state and thus emit radiations corresponding to the energy gap and is called as quanta.

Answer:

Tara does not get the same results when she conducts the experiment

Explanation:

The most likely reason Tara suggested to Victor to perform the experiment again before publication would be because she did not get the same results when she conducted the experiment.

A good scientific research or experiment should have an element of reproducibility. In order words, the claim made in published scientific research should be reproducible by any other scientist that decides to replicate the research. Tara repeated Victor's experiment in order to check its reproducibility and when she could not reproduce the results, she had to tell Victor to conduct the experiment again before deciding to publish it.

Answer:

(1) n-Octane

(2) 2-methyl-Heptane

(3) 3-methyl-Heptane

(4) 4-methyl-Heptane

(5) 2-ethyl-Hexane

(6) 3-ethyl- Hexane

Explanation:

We are given Octane which has the chemical formula as C8H18, and we need to find its three possible structures.

Isomerism is defined as the phenomenon in which a chemical compound will consist of the same chemical formula but it will have different orientation or bond arrangements. in simpler meaning isomers of a compound has same chemical formula but has different structures.

Some possible isomers of the compound Octane are given as in terms of their IUPAC names.

Chemical formula : C8H18

(1) n-Octane

(2) 2-methyl-Heptane

(3) 3-methyl-Heptane

(4) 4-methyl-Heptane

(5) 2-ethyl-Hexane

(6) 3-ethyl- Hexane

Answer:

B. insulator

hope it helps

The materials which prevents flow of electric current through it is called insulators. Thus, option B is correct. The materials which allow the current are conductors.

There are three types of substances based on their conducting nature. The materials which are highly conducting electrically at normal condition are called conductors. For example: metals.

Materials which does not conduct electricity at any condition are called insulators. Insulators prevent the flow of free electrons and thus are resistant to electric shock, example: wood

Some materials which does not conduct at normal temperature but, will conduct at higher temperature and also upon  mixed with other materials are called semiconductors. example:  silicon. Therefore, option B is correct.

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Answer:

1. The graph where x axis and y axis are present is called coordinate.

4. 18

Answer: A

Explanation:

Table salts and table sugars are pure substances. The correct option is c.

Pure substances are those substances that are made up of only one kind of atoms. They have definite mass and chemical composition. Some examples of pure substances are salt, sugar, baking soda, etc.

All chemical elements are pure substances. Table salt is an ionic compound that is made up of two elements, sodium, and chloride.  It comes under pure substance as it do not contain any impurities.

Table sugar is a compound that is made up of three elements, carbon, hydrogen, and oxygen. It is a pure substance because it has fixed a chemical composition and no impurities are present in it.  They are crystals.

Thus, the correct option is c. pure substances.

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