Help plz!!!!!!!!!! Urgent

Answer:

NH4

Explanation:

Answer: the answer is A or Tributaries, River system and rivers

Explanation: Its A i had the same question last year for my 10th grade assignment

Answer:

Limitations of Rutherford Atomic Model

Although the Rutherford atomic model was based on experimental observations it failed to explain certain things. Rutherford proposed that the electrons revolve around the nucleus in fixed paths called orbits. ... Ultimately the electrons would collapse in the nucleus.

Answer:

A) Km

B) m

C) cm

D) mm

Explanation:

A) The distance between Chicago and Saint Louis is quite a distance and would be best presented in the largest multiple of the SI unit of length.

For example if the distance is 500000 m, it's a bit bogus to write, so we can simplify by writing in terms of 10^(-3) m which is in km.

Thus, we can write as 500000 × 10^(-3) km = 500 km

B) By standard measurement, the size of a bedroom is usually: 3.6 m × 3.6 m.

This not complex to write and can be kept as it is in metres.

C) The average dimension of a textbook is around 0.25 m by 0.2 m.

Let's get rid of the decimal by converting to terms of 10² m which is expressed as cm.

Thus, dimension is now: (0.25 × 10²) by (0.2 × 10²) = 25 cm by 20 cm

D) Average thickness of a hair in metres is 8 × 10^(-5) m.

Now this is a bit long. So we can express is in terms of 10^(3) m which is an expression denoted by millimeter (mm).

Thus, thickness is 8 × 10^(-5) × 10³ = 0.08 mm

Answer:

potential energy (im positive that its right)

The type of clothe that you would wear when visiting the mesosphere are the winter clothes.

Mesosphere is used to describe the coldest part of the earth whose temperature is -85°C.

An individual that wants to visit such a cold area should wear clothes that would provide such with warmth such as the winter clothes.

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Answer:

The answer would be 80kg

Explanation:

Have a good day.

Answer:

It is 20. g HF

Explanation:

H2 + F2 ==> 2HF  ...  balanced equation

Since the question is asking us to find the mass of product formed, we will want to first convert the molecules of H2 into moles of H2 (we could do this at the end of the calculations, but it's just as easy to do it now).

moles of H2 present (using Avogadro's number):  

3.0x1023 molecules H2 x 1 mole H2/6.02x1023 molecules = 0.498 moles H2

From the balanced equation, we see that 1 mole H2 produces 2 moles HF.  Therefore, we can now find the theoretical mass of HF produced from 0.498 moles H2:

0.498 moles H2 x 2 moles HF/1 mol H2 = 0.996 moles HF formed.

The molar mass of HF = 20.01 g/mole, thus...

0.996 moles HF x 20.01 g/mole = 19.93 g HF = 20. g HF formed (to 2 significant figures)

Answer:

4.91

Explanation:

From the given information:

The millimoles of aniline = 100* 0.3065 = 30.65

30.65 millimoles HNO3 must be added to reach the equivalence point.

30.65 = V x 0.5774

V = 30.65/0.5774

V = 53.08 mL HNO3 must be added

Thus, total volume = 53.08 + 100 = 153.08 mL

[salt] = 30.65 /  153.08 = 0.20022 M

At equivalence point :

pOH = 1/2 [pKw + pKb + logC]

pOH = 1/2 [14 + 4.87 + log 0.20022 ]

pOH =9.086

pH = 14 - 9.086

pH = 4.914

pH ≅ 4.91 to 2 decimal places.

Answer:

D

Explanation: When you chill a substance when it is mixed with another substance, ( chilled vinegar mixed with sodium bicarbonate will react slower for instance) it reacts slower do to the molecules slowing down when chilled.

[tex]\huge\boxed{Option D}[/tex]

a liquid mixture in which the the solute which is in a smaller proportion is uniformly distributed within the the solvent which is the major component is called a solution.

It increases the rate of reaction,  because when we stir the solute in the solution, the mixed solute particles are distributed more further than when they are left stationary, making the environment (which surrounds the solute) less concentrated by the dissolved solute thus the rate increases and more solute is mixed.

No, A reacting substances  in water are those which can react with water that are Ionic metal. Water is made of ions [tex]H^+ and OH^-[/tex]. Substances(solute), they mix or dissolve more because Solutes ions interact with the ions of a water(solvent), thus breaking the bonds between the solute and then ions of solute form bond with the ions of water. Thus the rate increases in water.

No, because by the increase in temperature, the kinetic energy of more  molecules of a substance increase which results in reaching the threshold energy(minimum energy required by the molecules to change into product) of more molecules. So less molecules are left with low energy.

Yes, the rate of reaction decreases because  the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less molecules make up to the threshold energy. So decrease in temperature lowers the rate of the reaction.

Answer:

D. The total amount of energy in the system always stays the same

Explanation:

In the closed system, the total amount of energy in the system always stays the same.

Closed system is a arrangement in which exchange of energy or any material is restricted.

If any reaction is carried out in a closed system then energy of the system may convert from internal energy to potential or from potential to kinetic energy. But the total energy of the closed system is always remain same as before and after the reaction.

Hence option (D) is correct.

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Answer:

Yes

Explanation:

Sulfur and Sodium will have the same number of electron shells.

  Electronic configuration of

           k   l  m

  Na = 2  8  1

   S =  2  8  6

We see that the have the same energy level.

Also, they belong to the same period on the periodic table. Elements in the same period will have equal number of shell.

Answer: Disproportionation reaction

Explanation: A reaction where a compound undergoes oxidation as well as reduction. 2H2O2=2H2O + O2 here hydrogen peroxide is oxidized to oxygen and is reduced to water.

Answer: B (Decomposition)

Explanation: A P E X X X

Covalent compounds are named by using numerical prefixes to identify the number of atoms in the molecule. E.g. Mono, Di, tri, tetra, etc.

In the naming, never use mono- for the first element.

The first element keeps its name.

The second element always end in the suffix -ide.

Drop the double vowel for the prefix and the element of the second element in the compound.

Hope this helped!

It will be the same, as explained by conservation of mass.

hope this helped!

Answer:

Electrons

Explanation:

The breaking and forming of bonds between atoms in substances results in changes in the number of electrons in the substance.

Answer:

D. A process that breaks down large rocks into smaller pieces.

Explanation:

Physical weathering if referred to the process of rocks breaking apart without changing their chemical composition. If you look at the other answers, none of them match the description of physical weathering.

Answer:

A process that breaks down large rocks into smaller pieces.

Answer:

The preceding temperature is equivalent to approximately 9.6 K => -263.5 °C

Explanation:

Given the provided problem, the formula may be substituted by the corresponding values:

Pressure (P)= 932 mmHg ==> 1.2 atm

Volume (V) = 2,300 mL ==> 2.31 L

Moles (n) = 3.51 moles ==> 3.51 mol

Proportional constant of ideal gas constant: (R) = 0.08206

Therefore, we can equate the following:

T= (PV)

     nR

T= (1.2 atm · 2.31 L)

   (3.51 mol · 0.08206)

T= 9.6 K ==> -263.5 °C

Thus, the cumulative temperature given the substituents/substance is equivalent to -263.5 °C.      

Answer:

Dana filtered the sample and larger granules of the sample were left behind.

Explanation:

If a substance is pure, it will have a uniform composition throughout. It will not separate into particles of various sizes.

One of the characteristics of pure substances is that they are homogeneous. A mixture is definitely made up of particles of various sizes.

Since the particles was filtered and larger granules were left behind, the sample has been separated by a physical method (filtration). Only a mixture can be separated by physical methods. It is not a pure substance.

Answer:

1.Difference.

Mixtures are physically combined and can be separated by physical means while compounds are chemically combined and are separated by chemical means.

2.Mixtures do not have mixed boiling and melting points while compounds have mixed boiling and melting points.

2.Similarity.

Both mixtures and compounds are composed of two or more substances or elements combined.

Both can be separated.

Mixtures and compounds are alike in the following ways:

1. Both mixture and compound contains two or more substances.

2. Both mixture and compound can be separated.

3. Both mixture and compound have physical properties.

Mixtures and compounds are different in the following ways:

1. A mixture contains two or more substances that are not chemically combined together while a compound contains two or more substances chemically combined together.

2. A mixture can be separated by physical methods while a compound can only be separated by chemical methods.

3. Mixtures can not be represented using a chemical formula. Compounds can be represented by chemical formula.

4. Examples of mixtures include: milk, kerosene in water etc. Examples of compounds include water, sodium chloride etc

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Answer:

142.04 g/mol  is the answer to your question.

Answer:An alcoholic drink is a drink that contains ethanol, a type of alcohol produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcohol plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages.

Explanation: vodka the preferred alcoholic beverage of choice among alcoholics? #3 Doesn't make you feel bloated or full like beer does. It goes down quickly and smooth. #4 Gets you drunk just as fast as any other hard liquor can, and obviously much faster than beer or wine.

Answer:

Potassium

General Formulas and Concepts:

Chem

Explanation:

The Periodic Trend for 1st Ionization Energy is increasing up and to the right. That means He would have the highest I.E and therefore take the most amount of energy to remove an electron.

Potassium and Gallium are both in Period 4. Potassium is element 19 and Gallium is element 31.

Potassium's electron configuration is [Ne] 4s¹ and Gallium's electron configurations is [Ne] 4s²3d¹⁰4p¹. Since both are in Period 4, they have the same number of core e⁻. Therefore, the shielding effect is the same.

However, since Gallium is element 31, it has 31 protons compared to Potassium, which is element 19 and has 19 protons. Gallium would have a greater Zeff than Potassium as it has more protons. Therefore, the FOA between the electrons and nucleus of Ga is much stronger than that of K. Thus, Ga requires more energy to overcome those FOA to remove the 4p¹ e⁻. Since K has less protons, it will have a smaller Zeff and thus less FOA between the e⁻ and nucleus, requiring less energy to remove the 4s¹ e⁻.

Answer:

the correct answer in energy

Explanation:

The term refers to the ability to do work is energy. The correct option is A.

Energy is the quantitative property that is required by the body to do some work. It is a conserved quantity, but can not be created or destroyed.

Animals and plants get energy from food.

Thus, the correct option is A. energy.

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Answer:

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Answer:

It is chemical Change

Explanation:

Because you are changing the substance.

Answer: it moves faster

Explanation:

When heat is added it gains thermal energy therefore it moves faster as things heat up and it loses thermal energy when it gets cooler causing particles to move slower