HELLOSOEOODORODODODORRLKRKLRLRLF

Answer:

Atomic number is protons

Explanation:

Protons = positive charge

Answer:

This question is incomplete

Explanation:

This question is incomplete but the completed question is below;

"The following list of properties is most descriptive of a(n) ______

1. High melting point, conductor of electricity when dissolved in water

2. Low melting point, non-conductor of electric current

3. Malleable, ductile, insoluble in water.

The choices for all 3 are: a) metallic solid b) molecular solid c) ionic solid d) all of these e) none of these f) more than one of these"

1. Ionic solid: Ionic solids are solids that have ionic/electrovalent bonds holding it's constituent molecules together. These bonds are strong bonds that involve the transfer of electrons from one constituent atom (the metal) to another constituent atom (the nonmetal). This strong bond causes the solid to have a high melting and boiling point. Also, when dissolved in water, the constituent atoms (involved in the electron transfer) dissociate to form ions (become charged) and thus easily carry electric charges (i.e conduct electricity).

Examples are Sodium Chloride and Potassium Iodide

2. Molecular solids: These are solids whose constituent molecules are held together by a weak bond/force known as Van der Waal forces. This forces are easily broken down when subjected to heat and thus the molecular solids have a low melting point. Also, these solids do not have carriers of heat or electric charges in them and are thus non-conductors of electric current.

Examples are Ice (frozen water) and sucrose

3. Metallic solids: These of solids made from constituent metal atoms only. The nuclei of these constituent metal atoms have the ability to move past one another without disrupting there metallic bonding; it is for this reason they are malleable and ductile. There constituent atoms however do not dissociate in water and are thus insoluble in water.

Examples are aluminium and copper crystal.

There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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First, let's see the proportion of the chemical equation:

8 moles of HNO₃ need to react with 3 moles of Cu.

You have 2.0 mol of HNO₃, so you can use the rule of 3 to find out how many moles of Cu you will need.

8 moles of HNO₃ ----- 3 moles of Cu

2 moles of HNO₃ ----- x moles of Cu

8x = 3 × 2

x = 6/8

x = 0.75 moles of Cu.

But you need to find how many grams. To find out, you need to know what the atomic mass of Cu. You can consult the periodic table to find out, the atomic mass of copper is 63.6 g/mol.

Now you need to transform moles into grams:

63.6 g of Cu ---- 1 mol of Cu

x g of Cu ---- 0.75 mol of Cu

x = 63.6 × 0.75

x = 47.7 g

Answer: It is needed 48 g of Cu to react with 2.0 mol of HNO₃.

The heat of formation of CuBr₂ (s) = -141.8 kJ/mol

The heat of reaction ΔH = ∑ΔHproducts - ∑ΔHreactants

ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]

where ΔHCuBr₂ (s) = heat of formation of CuBr₂ (s),  ΔHCl₂ (g) = heat of formation of Cl₂ (g) = 0 kJ/mol, ΔHCuCl₂ (s) = heat of formation of CuCl₂ (s) = -205.9 kJ/mol, ΔHBr₂(l) = heat of formation of Br₂(l) = 0 kJ/mol and ΔH = heat of reaction = 64.1 kJ/mol

Substituting the values of the variables into the equation, we have

ΔH = ΔHCuBr₂ (s) + ΔHCl₂ (g) - [ΔHCuCl₂ (s) + ΔHBr₂(l)]

64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol - [-205.9 kJ/mol + 0 kJ/mol]

64.1 kJ/mol = ΔHCuBr₂ (s) + 0 kJ/mol + 205.9 kJ/mol - 0 kJ/mol

64.1 kJ/mol = ΔHCuBr₂ (s) + 205.9 kJ/mol

ΔHCuBr₂ (s) = 64.1 kJ/mol - 205.9 kJ/mol

ΔHCuBr₂ (s) = -141.8 kJ/mol

So, the heat of formation of CuBr₂ (s) = -141.8 kJ/mol

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From the given data, the name of the hydrated salt would be  \(CoCl_2.83H_2O\).

The formula of the hydrated salt can be determined using the empirical formula approach. That is, we will find the mole equivalent of the anhydrous salt and the water of hydration and then combine them into a single formula after dividing by the smallest mole.

First, we need to determine the mass of the anhydrous salt and the water of hydration.

Mass of crucible (x) = 12.090 g

Mass of hydrated salt + crucible (y) = 16.250 g

Thus, the mass of the hydrated salt can be determined by subtracting x from y.

Mass of hydrated salt = 16.250 - 12.090 = 4.16 g

Mass of hydrate + crucible after evaporating off the water (z) = 12.424 g

Mass of anhydrous salt = z - x

                                      = 12.424 - 12.090

                                      = 0.334 g

Mass of water = 4.16 - 0.334

                        = 3.826 g

Now, let's find the moles:

Molar mass of \(CoCl_2\) = 129.839 g/mol

Molar mass of water = 18.01 g/mol

Mole of \(CoCl_2\) = 0.334/129.839 = 0.00257 mol

Mole of water = 3.826/18.01 = 0.2124 mol

Dividing through by the smallest mole

\(CoCl_2\) =  0.00257 / 0.00257  = 1

water = 0.2124/ 0.00257 = 83

Thus, the formula of the hydrate would be \(CoCl_2.83H_2O\)

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Answer:

The waters' temp increased

Explanation:

The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.

Answer:

Salt water

Explanation:

Please mark me brainliest and thank me.

Answer:

the answer slat water

Explanation:

The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg

To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:

F = (G * m1 * m2) / \(r^{2}\)

where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.

Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):

1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)

Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.

The question was incomplete. find the full content below:

Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid

A. 3.4 x \(10^{11}\) kg

B. 8.3 x \(10^{12}\) kg

C. 1.2 x \(10^{12}\) kg

D. 1.2 x \(10^{10}\) kg

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Answer:

I) descending order first highest to smallest Ar Ne He ii) Bromomethane chloromethane Fluoromethane

0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

we can see that 3 moles of lithium hydroxide (LiOH) are produced for every 1 mole of lithium nitride (Li₃N) that reacts.

To determine the mass of LiOH produced from 0.38 g of Li₃N, we need to first calculate the number of moles of Li₃N present:

molar mass of Li₃N = 3 x atomic mass of Li + 1 x atomic mass of N

= 3 x 6.94 g/mol + 1 x 14.01 g/mol

= 34.83 g/mol

moles of Li₃N = mass / molar mass

= 0.38 g / 34.83 g/mol

= 0.01093 mol

Since the balanced equation shows that 1 mole of Li₃N produces 3 moles of LiOH, we can calculate the number of moles of LiOH produced:

moles of LiOH = 3 x moles of Li₃N

= 3 x 0.01093 mol

= 0.03279 mol

Finally, we can use the molar mass of LiOH to convert from moles to grams:

molar mass of LiOH = atomic mass of Li + 1 x atomic mass of O + 1 x atomic mass of H

= 6.94 g/mol + 15.99 g/mol + 1.01 g/mol

= 23.94 g/mol

mass of LiOH produced = moles of LiOH x molar mass of LiOH

= 0.03279 mol x 23.94 g/mol

= 0.785 g

Therefore, approximately 0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

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In the periodic table, positive ions grow in magnitude from left to right, whereas negative ions grow in magnitude from right to left.

The periodic table shows that there are more valence electrons on the right than the left. The maximum amount of ionic charge that an element can hold fluctuates as the quantity of valence electrons rises.

Metals on the periodic table's left side mostly produce positively charged ions. These ions get stronger with time, increasing in size.

The negative charges on the ions that nonmetals on the right side of the periodic table produce, have a diminishing magnitude with time.

For example, when we move from atomic number10 to 11, because we are changing from a noble gas to a very reactive alkali metal, moving from such an element with a full octet to one with just the outermost electron, which readily relinquishes it in order to follow the octet rule, there is a very significant degree of change in reactivity.

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They form after violent eruptions blow lava fragments into the air, which then solidify and fall as cinders around the volcanic vent.

Usually the size of gravel, these cinders are filled with many tiny bubbles trapped in the lava as it solidifies. Cinder cones stand at heights of tens of meters to hundreds of meters. Cinder cones form from ash and magma cinders--partly-burned, solid pieces of magma, that fall to the ground following a volcanic eruption. This type of eruption contains little lava, as the magma hardens and breaks into pieces during the explosion.

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Answer:

I think it is a)in freshwater lakes,rivers,and stream

Answer:

a) in freshwater lakes, rivers, and streams

Answer:

This question contains a lot of subsections. Please find the variables to each question below

Explanation:

Hypothesis is a testable explanation to a scientific question. It aims at proffering a testable solution to an observed problem. It usually goes in an IF, THEN format.

Dependent variable is the variable being measured in an experiment, while the independent variable is the variable that is manipulated or changed by the experimenter.

The control group is the group that does not receive the experimental treatment while constant is the variable that is kept unchanged for all groups in the experiment.

Based on this explanation, find the answers to the hypothesis, independent variable, dependent variable, constant, and control groups to each question.

2. Dependent variable: How easy it is to remember

Independent variable: Color of the text

Control: Group given Black and White text to read

Constants: Same text

3. Hypothesis: If the temperature is increased, THEN the speed of ants increases or move faster

Independent variable: TEMPERATURE

Dependent variable: SPEED OF ANTS

Control: Ants placed in room temperature

Constants: SAME KIND OF ANTS

4. Hypothesis: IF the pH of the soil is acidic or alkaline, THEN the growth of strawberries will be inhibited

Independent variable: pH of soil

Dependent variable: Growth of strawberries

Control: Strawberries grown in a Neutral pH soil

Constants: Same type of plants (strawberries)

5. Hypothesis: IF caffeine is taken, then the blood pressure will be increased or raised.

Independent variable: CAFFEINE

Dependent variable: BLOOD PRESSURE

Control: Group given no caffeine

Constants: Same amount of caffeine

6. Hypothesis: IF music is played, THEN the heart rate increases

Independent variable: MUSIC

Dependent variable: HEART RATE

Control: Groups placed where no music is played

Constants: Same type of music, same time music runs for etc.

7. Hypothesis: IF bleach is present/used, THEN bacteria will die

Independent variable: Bleach

Dependent variable: Death of bacteria

Control: Bacteria given no bleach

Constants: Same species of bacteria, Same type of bleach

Answer:

Matter can be broken down into two Zalo categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.

The experiment looks into how temperature impacts how quickly magnesium metal reacts with hydrochloric acid. The creation of hydrogen gas over time is used to determine the dependent variable, which is the reaction rate.

The experiment can be run at various temperatures to change the experiment's independent variable, which is the reaction mixture's temperature. Higher temperatures cause molecules to move more quickly, increasing the likelihood of reactant collisions and kinetic energy. By enabling more successful collisions between magnesium atoms and hydrochloric acid, can quicken the reaction and increase the amount of hydrogen gas produced. In contrast, it is anticipated that the reaction rate will be slower at lower temperatures since there will be less molecular mobility and fewer successful collisions.

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--The complete Question is, What is the effect of temperature on the rate of reaction between hydrochloric acid and magnesium metal?

The dependent variable in this experiment is the rate of reaction, which can be measured by monitoring the production of hydrogen gas over time. The independent variable is the temperature of the reaction mixture, which can be controlled and varied by conducting the experiment at different temperatures.--

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart. Option A)

The assumption that accounts for the great compressibility of gases compared to liquids and solids is assumption 1: Gases are made up of molecules which are relatively far apart.

In gases, the molecules are widely spaced and have significant gaps between them. This allows gases to be easily compressed under pressure. When external pressure is applied to a gas, the molecules can be brought closer together, reducing the volume occupied by the gas. The gaps between the molecules provide room for compression, allowing gases to occupy a smaller volume.

In contrast, liquids and solids have molecules or particles that are closely packed together. The intermolecular forces in liquids and solids are stronger, limiting their compressibility. The molecules or particles are already in close proximity, leaving little room for further compression.

Therefore, the assumption that gases consist of molecules that are relatively far apart accounts for their greater compressibility compared to liquids and solids. Hence Option A) is correct.

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Answer:

480 mins

Explanation:

Answer:First we will find the volume of the tank.

Volume of right cylinder = pi * r² * h

⇒  3.14 * 6 ² * 4

⇒ 3.14 * 36 * 4

⇒452 . 16 feet³

Now as  1 cubic foot of water is about 7.5 gallons we will and rate 10 gallons per minute.

So, every minute 10/ 7.5 ≅ 1.34 cubic foot is getting filled.

Time taken = 452.16/ 1.34  ≅ 337.43 minutes

Which means 5.62 hours approximately and when rounding to the nearest tenth 5.6 hours.

Explanation:That is the answer

Answer:

4.255 J/ K

Explanation:

Given data :

mass of Gallium = 16 gm

molar mass = 69.723 g/mol

hence no of moles = 16 / 69.723 = 0.23 moles --------- ( 1 )

Δh ( heat fusion ) = 5.59 KJ/mol

Temperature = 29.8°C = 302.8 k

Determine the entropy change of gallium

Δs ( entropy change ) =  heat fusion / temperature

 = ( 5.59 * 1000) J/mol / 302.8 = 18.46 J/k*mol

Hence entropy change of gallium

= Δs * no of Gallium moles

= 18.46 * 0.23 = 4.255 J/ k

I hope this is right haha

Answer:

0.7692 M

Explanation:

\(m\) = Mass of sample = \(20\ \text{g}\)

\(V\) = Volume of solution = \(150\ \text{mL}\)

\(V_1\) = Initial volume taken out of the stock solution = \(15\ \text{mL}\)

\(Mo\) = Molar mass of NaOH = \(39.997\ \text{g/mol}\)

\(V_2\) = Final volume of solution = \(65\ \text{mL}\)

Molarity of stock solution is given by

\(M_1=\dfrac{m}{MoV}\\\Rightarrow M_1=\dfrac{20}{39.997\times 0.15}\)

\(M_1V_1=M_2V_2\\\Rightarrow M_2=\dfrac{M_1V_1}{V_2}\\\Rightarrow M_2=\dfrac{\dfrac{20}{39.997\times 0.15}\times 0.015}{0.065}\\\Rightarrow M_2=0.7692M\)

The concentration of NaOH for the final solution is 0.7692 M