the continents of earth were clutered to gether in formation that a scientist named what

Answer:

I'm pretty sure that the answer is D.

Answer:

gas

Explanation:

The gas molecules are far apart and as such, when heated they gain more kinetic energy thereby colliding with one another and with the wall of the container thereby exerting pressure and also they can be compressed by reducing the distance between between the molecules.

Matter is anything that is made up of atoms. Matter can be solid, liquid or gas.  Out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Anything around us that can be physically seen and touched are matter.

The intermolecular forces of attraction between the particles is highest in solid and lowest in gas. So, gas can be easily expand by increasing temperature. As the temperature increases the randomness between the particles also increases and hence particles move apart and expand. On decreasing pressure or temperature the randomness of particles decreases and hence particles comes closer and get compressed.

Thus out of solid, liquid and gas, gas is the matter that expand on heating and compressed on cooling

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Answer:

Acid-Base

Combustion

Combination

Decomposition

Explanation:

(1)  KOH is acid and HBrO is a base which reacts to form water , thus it is an example of acid-base reaction.

(2) In the reactants Oxygen gas is used , whenever Oxygen comes in a reaction it is an example of Combustion reaction as the other reactant starts burning.

(3) Here two reactant combines to produce a single product , thus it is an example of Combustion Reaction.

(4) Here A single reactant decomposes to form two products in this reaction , thus it is an example of Decomposition Reaction.

Answer:

48

Explanation:

So all we have to consider here is the atomic number. Remember that in a neutral atom the amount of electrons = the amount of protons.

Also that the atomic number = the number of protons.

So we can say that in an atom with atomic number 48, there are 48 protons and therefore 48 electrons.

An atom of an element with an atomic number of 48 and mass number of 120 contains 48 electrons, indicating that it is a neutral atom. The number of neutrons can be determined by subtracting the atomic number from the mass number, which in this case, gives 72 neutrons.

The atomic number of an element 48 in this case, defines the number of protons in its nucleus and also, in a neutral atom, the number of electrons. Therefore, an atom of an element with an atomic number of 48 contains 48 electrons. The mass number (120) is the sum of the number of protons and neutrons in the atom's nucleus. To find the number of neutrons, we subtract the atomic number from the mass number (120-48), which gives us 72 neutrons.

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Answer:

Temperature is an indicator of average kinetic energy

Explanation:

Temperature of any substance is proportional to the average kinetic energy associated with the random motion of the atoms or molecules from which substances are formed.

Answer:

2Ag₂O  →  4Ag + O₂

Explanation:

Chemical equation:

Ag₂O  →  Ag + O₂

Balanced chemical equation:

2Ag₂O  →  4Ag + O₂

The given reaction is the decomposition of silver oxide. The silver oxide is decomposed into its constituent element silver and oxygen.

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

This reaction also followed the law of conservation of mass because there are equal number of atoms of all elements on both side of equation.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Answer:

provide rewards to use solar power

Explanation:

Using solar power we can avoid bad energy like Coal, oil, natural gas, uranium and water from a dam.

All these kinds of energy producing air pollution, water pollution, or greenhouse gases.

But solar power has some toxic materials, also, using a lot of water to keep and clean solar power. In addition, if we create a solar power near a river or lake may cause damage.

We must think in these factors before to do a solar power.

Answer:

The scientist have developed to classify organisms because the living things with similarities can put into groups, which can further make easy to understand the relationship between them.

Explanation:

The scientist have classified organisms in different groups which can make their study easier. In this manner the organisms with same character will be in same group and their relationship and behavior with themselves as well as with others can be studied easily. It will make things less confusing. In this way the inheritance and genetic behavior can also be studied easily. This classification are based on various other categories like structure, function and also relationship with others.

Answer:

'classification allows for better identification of new organisms.'

Explanation:

Answer:

Cardiac muscle cells are found only in the heart, and are specialized to pump blood powerfully and efficiently throughout our entire lifetime. Four characteristics define cardiac muscle tissue cells: they are involuntary and intrinsically controlled, striated, branched, and single nucleated.

Explanation:

Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has a striated appearance, is under involuntary control, contains intercalated discs for coordinated contraction, and is highly endurance.

Cardiac muscle is a specialized type of muscle tissue found only in the heart. It has unique characteristics that allow it to efficiently contract and relax, enabling the heart to pump blood throughout the body.

Some key characteristics of cardiac muscle include:

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Answer:

D They are heterotrophs

Explanation:

All fungi are eukaryotes, and most are muticellular. Only the fungi called yeasts are unicellular. Fungi are heterotrophs.

HOPE THIS HELPS! HAVE A GREAT DAY!! :)

Mushrooms, bread moulds, and yeasts are classified as fungi based on the characteristics of being D. heterotrophs.

An important characteristic used to classify mushrooms, bread moulds, and yeasts as fungi is that they are heterotrophs. Heterotrophs are organisms that obtain their nutrients by consuming other organic matter. In the case of fungi, they obtain their nutrients through extracellular digestion, breaking down organic materials externally and absorbing the nutrients.

This is in contrast to autotrophic organisms, which can produce their own food through processes like photosynthesis. Thus, are organisms that cannot produce their own food and rely on consuming other organisms or organic matter. They encompass a wide range of species, from herbivores that eat plants to carnivores that prey on other animals, and even decomposers that feed on dead organic material.

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Answer:

x = 2.2*10^23 molecules of H2O

Explanation:

H = 1g

O = 16g

H2O = 1g*2 + 16g

H2O = 18g = 1 mol of H2O

18 g___1 mol of H2O

6.38g__ x = 0.354 mol of H2O

1 mol______6.22*10^23 molecules

0.354 mol__x = 2.2*10^23 molecules of H2O

Answer:

c.mountain ranges

Explanation:

scientists wondered how they where formed and came to the conclusion that they might be forced upward by movement of the earths crust

Answer:

mountain ranges

Explanation:

The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called plate tectonics, and buckle up like the hood of a car in a head-on collision.

Answer: Adolf Hitler was a German politician and he made the Nazi Party. He rose to power when he was the chancellor. He was also a dictator and he caused World War 2 when he invaded Poland September 1, 1939.

Answer: Adolf Hitler created the Nazi Party. He was a dictator and he rose to power when he was the chancellor in 1933 and then Fuhrer in 1934. He was the cause of World War 2 when he had invaded Poland.

*Fuhrer is a German term which means "The Leader".

Answer:

464.1 J absorbed.

Explanation:

Given data:

Specific heat of zinc =  0.39 J/g°C

Mass of zinc = 34 g

Temperature changes = 22°C to 57°C

Energy absorbed or released = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 57°C -  22°C

ΔT = 35°C

Q = m.c. ΔT

Q = 34 g. 0.39 J/g°C. 35°C

Q = 464.1 J

Answer:

A: 238 g

B: 224 g

Explanation:

Data given:

A.

number of moles of H₂O₂ = 7.00 mole

mass of H₂O₂ = ?

B.

number of moles of NaOH = 5.60 mole

mass of NaOH = ?

Solution:

Part A:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of H₂O₂ = 2(1) + 2(16)

Molar Mass of H₂O₂ = 2 + 32

Molar Mass of H₂O₂ = 34 g/mol

Put values in equation 1

                 mass in grams = 7.00 mol x 34 g/mol

                 mass in grams =  238 g

mass of H₂O₂ = 238 g

_______________________

Part B:

Formula will be used

               no. of moles = mass in grams / molar mass

As we have to calculate mass of substance

So, rearrange the above equation

             mass in grams =  no. of moles x molar mass . . . . . . (1)

Molar Mass of NaOH = 23 + 16 + 1

Molar Mass of NaOH  = 40 g/mol

Put values in equation 1

                 mass in grams = 5.60 mol x 40 g/mol

                 mass in grams =  224 g

mass of NaOH = 224 g

Answer: option C.

Explanation: aldehyde has a functional group R—CHO

Answer:

a. Be and Mg

Explanation:

Be (beryllium) and Mg (magnesium) are both found in the alkaline earth metals family (group 2) on the periodic table. Elements in the same family or group have similar properties,

Ca and Br are in groups 2 and 17

Cl and Ar are in groups 17 and 18

Na and P are in groups 1 and 15

Answer:

To find how many feet their are in 58 yards, you have to multiply 58 yards by 3, because their are 3 ft per yard.

Explanation:

58 * 3 = ?

58 * 3 = 174 feet

Your answer is 174 feet.

I hope this helps!

Oxygen is the most active non-metallic element in Group 16 of the periodic table, also known as the oxygen family. This is primarily due to its small atomic size relative to other elements in the group.

The most active non-metallic element in Group 16 of the periodic table is oxygen. Group 16 elements are also known as the oxygen family. These elements become less active as you move down the group due to an increase in atomic size, which contributes to a decrease in electronegativity. Among the members of this group, oxygen has the smallest atomic size, making it the most active nonmetal in this group. Examples of other elements in this group are sulfur, selenium, tellurium, and polonium, but oxygen is significantly more reactive.

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Answer:

Based on whether an element is a metal or non-metal, or their charge if given.

Explanation:

Cations are positively charged ions. Elements that are metals become positively charged.

Anions are negatively charged ions. Elements that are non-metals become negatively charged.

To identify the cation and anion in an ionic compound, name the cation first and the anion second without including the word 'ion'. If the cation can have multiple charges, include either the oxidation number according to the Stock system or use -ous/-ic suffixes in the classical system. The formula must reflect a balance of total positive and negative charges to ensure electrical neutrality.

To identify the cation and anion in an ionic compound, you follow specific nomenclature rules. The name of the ionic compound is written with the cation name first, followed by the anion name, without using the word ion for either. For example, to name Ba(NO₃)₂, you would call it barium nitrate, naming the metal barium as the cation followed by the anion nitrate.

When a cation has more than one possible charge, the compound is named either using the Stock system, which includes the cation's oxidation number, or by using the classical system, which includes the Latin-based name of the cation with the suffix -ous or -ic. For instance, FeCl₃ is named iron(III) chloride in the Stock system or ferric chloride in the classical system because iron can have multiple oxidation states.

To determine the correct number of ions for the formula, the overall charge of the compound must be neutral. This means the total positive charge of the cations must balance the total negative charge of the anions. Thus, writing the chemical formula involves deducing the correct ratio of ions so that their charges cancel each other out.

Answer:

O3+, O3, O3-

Explanation:

O3- has the highest bond angle because it has the highest electro negative value. Increase in electronegativity leads to increase in bond angles so as to minimize interelectronic repulsion between the electrons. Decrease in electronegativity leads to decrease in bond angle because the repulsion is minimized.

In general, the more electronegative an ion is, the larger the bond angle. The more electropositive an ion is, the smaller the bond angle. Hence cations are smaller than anions.

The bond angles of O3+, O3, and O3- can be ordered as O3- < O3 < O3+ from smallest to largest based on electron geometry and electron-electron repulsion.

When ordering the bond angles of O3+, O3, and O3- from smallest to largest, we must consider the electron geometry of each molecule/ion. In general, bond angles tend to decrease as the number of non-bonding electron pairs increases, due to the increased electron-electron repulsion.

In the case of O3+, it has fewer non-bonding electron pairs than neutral O3, leading to greater bond angles. O3, or ozone, has a bent molecular geometry, with a bond angle of roughly 117 degrees. O3-, or the ozone ion, has more non-bonding electrons, which will reduce the bond angle.

So, the bond angles would most likely be ordered as follows: O3- < O3 < O3+.

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Answer:

A.

Explanation:

A base is a substance that produces hydroxide ions in an aqueous solution.

A base is defined as a compound that produces hydroxide ions in solution (option A).

A base in chemistry is a water-soluble compound having bitter taste, that turn red litmus blue, and react with acids to form salts.

Asides the above properties of a base, a base is capable of producing hydroxide ions (OH-) when dissociated in an aqueous solution.

Examples of bases that would dissociate in water to produce hydroxide ions are as follows:

Therefore, option A is correct.

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Answer:

The solution is made up of the solvent and solute.

The solvent and solute are separated by physical means.

Explanation:

Any mixture must have a solvent and solute, or else it can't be classified as a mixture.

Additionally, I took a test and debated between the "distillation" and "physical means" problem, and got the "distillation" one wrong. It does make sense; evaporation is a physical mean through which the solvent is separates from the solute, even if it isn't caused by humans.

The 4th one just sounds absurd, and I would be shocked if it were correct.

Answer:

Explanation:

The process of dissolving carbon dioxide in water and soft drinks is called carbonation, when there is a fizz, the carbon dioxide escapes from the water as an effervescence.

Due to the increase in atmospheric pressure in the mine, the ability of the dissolved carbon dioxide in the drink to escape is reduced, this accounts for why the drinks tastes flat.

When the miner gets to the ground surface, the atmospheric pressure becomes normal, so in the miner's stomach the carbon dioxide in the soft drink escapes and this results in the miner's continuous belching.

Answer:

Flammability is a material’s ability to burn in the presence of oxygen.

Explanation:

Flammability can be described as the ability of a substance to get ignited. Flammability will lead to fire or combustion. Some substances are highly flammable like Benzene. Other tend to be just flammable. And there are also compounds which will nor be flammable at all as they won't react with oxygen. Examples of these substances include helium, steel or glass.

The flammability of a substance shall be considered a very important aspect when storing or transporting a substance.

Answer:

m = E × Q

And Q = I × t

m = E × I × t

Where m = mass in grams

Q = quantity of electricity in coulomb

I = current in ampere

t = time in seconds

E = electrochemical equivalent of the substance

Explanation:

Answer:

energy can neither be created nor be destroyed but it can only change  from one form to another or transfer from one to another object this is the simplest way of understanding the law of conservation of energy. In simple line its the transfer of energy only.

so now the potential energy is the energy that is in stored form while kinetic energy is that energy which an object contain due to any particular motion.

like a ball is thrown in air so the energy through which it goes upward is kinetic energy and for downward movement of ball it need another energy which is potential energy(in the stored form) and by using this energy it goes downward.

Answer:

Option A: Second equation by 2 and reversing the first equation

Explanation:

In order for the equation to become balanced by elements, dividing the second equation by 2 and then reversing the first equation to simplify the equation correctly is how you can then add the intermediate chemical equations. Took the test on edg and it was correct :)

In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side

They provide brief information about the amount of chemicals participating in a reaction.

In the given reaction,

Multiplying the second equation by 2 gives -

2H₂ + 2F₂ = 4HF

And then reversing it and adding to the first one gives -

      4HF = 2H₂ + 2F₂

2H₂ + O₂ = 2H₂O

The hydrogens on both the sides cancel out and we are left with

                                       4HF + O₂ = 2H₂O + 2F₂

Therefore, In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the second equation by 2 and reversing it and the correct option is option D.

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