Calculate the number of total atoms in 195 grams of Ni(OH)2.

Explanation:

Not only did outermost electron determine the valence electron, but also periodic table. whatever group they fall into in periodic table each valence electrons present in a particular atom e.g K and Ca belong to group 1 and 2 respectively and k has 1 and Ca have 2 in each outermost electron

Answer:

5.3 mL

Explanation:

1 g = 1 mL

5.3 g

= 5.3 x 1

= 5.3 mL

Answer:

Speed can be thought of as the rate at which an object coverse distance

B) Reate distance

Answer:

the people injected with the drug are the variable group while the people injected with the harmless solution are the control group

Answer:

One of water's most significant properties is that it takes a lot of energy to heat it. Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.

Explanation:

Answer:

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CONTENTS

PHYSICAL GEOLOGY

Chapter 2 Minerals

2.1 Electrons, Protons, Neutrons, and Atoms

All matter, including mineral crystals, is made up of atoms, and all atoms are made up of three main particles: protons, neutrons, and electrons. As summarized in Table 2.1, protons are positively charged, neutrons are uncharged and electrons are negatively charged. The negative charge of one electron balances the positive charge of one proton. Both protons and neutrons have a mass of 1, while electrons have almost no mass.

Table 2.1 Charges and masses of the particles within atoms

Elementary Particle Charge Mass

Proton +1 1

Neutron 0 1

Electron −1 ~0

The element hydrogen has the simplest atoms, each with just one proton and one electron. The proton forms the nucleus, while the electron orbits around it. All other elements have neutrons as well as protons in their nucleus, such as helium, which is depicted in Figure 2.2. The positively charged protons tend to repel each other, and the neutrons help to hold the nucleus together. The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic mass is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.

For most of the 16 lightest elements (up to oxygen) the number of neutrons is equal to the number of protons. For most of the remaining elements, there are more neutrons than protons, because extra neutrons are needed to keep the nucleus together by overcoming the mutual repulsion of the increasing numbers of protons concentrated in a very small space. For example, silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28. The most common isotope of uranium has 92 protons and 146 neutrons. Its atomic number is 92 and its atomic mass is 238 (92 + 146).

helium atom

Figure 2.2 A depiction of a helium atom.

The dot in the middle is the nucleus, and the surrounding cloud represents where the two electrons might be at any time. The darker the shade, the more likely that an electron will be there. An angstrom (Å) is 10-10m . A femtometre (fm) is 10-15m. In other words, a helium atom’s electron cloud is about 100,000 times bigger than its nucleus.

Electrons orbiting around the nucleus of an atom are arranged in shells — also known as “energy levels.” The first shell can hold only two electrons, while the next shell holds up to eight electrons. Subsequent shells can hold more electrons, but the outermost shell of any atom holds no more than eight electrons. The electrons in the outermost shell play an important role in bonding between atoms. Elements that have a full outer shell are inert in that they do not react with other elements to form compounds. They all appear in the far-right column of the periodic table: helium, neon, argon, etc. For elements that do not have a full outer shell, the outermost electrons can interact with the outermost electrons of nearby atoms to create chemical bonds. The electron shell configurations for 29 of the first 36 elements are listed in Table 2.2.

Answer:

It is melting chocolate and freezing water.

Explanation:

If your melting melting chocolate it would turn into a liquid and if you freeze

water then you are turning liquid to a solid.

Melting chocolate and freezing water are the examples of phase change.

A phase change is a change in the states of matter. For example, a solid may become a liquid. This phase change is called melting. When a solid changes into a gas, it is called sublimation.

A phase transition is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas.

There are eight thermal processes through which matter can attain phase change. They are melting, freezing, evaporation, condensation, sublimation, deposition, ionization, and recombination.

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Answer:

boiling

Explanation:

Answer:

ajajbshdbrbxjdnd djxbxbx

Explanation:

hdjdndjsosnbdjdkx dkdmdbdjd

Answer:

The assumption is quite reasonable.........

A lightbulb contains Ar gas at a temperature of 295K and at a pressure of 75kPa. The light bulb is switched on, and after 30 minutes its temperature is 418 K. What is a numerical setup for calculating the pressure of the gas inside the light bulb at 418K?

Explanation:

P

1

T

1

=

P

2

T

2

given constant

n

, and constant

V

, conditions that certainly obtain with a fixed volume light bulb.

And so

P

2

=

P

1

T

1

×

T

2

=

75

⋅

k

P

a

295

⋅

K

×

418

⋅

K

≅

100

⋅

k

P

a

.

Had the light bulb been sealed at normal pressure during its manufacture, what do you think might occur when it is operated?

Answer:

Generally, interactions with air, water and living organisms cause the weathering of rocks. Although there are two major types of weathering processes, physical weathering and chemical weathering cannot be separated, and they often work together at different rates to break large rocks into smaller pieces over time.

Explanation:

hope this helps if not sorry :)

Answer:

Explanation:

movement of water from high potential to low potential

Answer:

10.793 kilometres per hour

Answer:

First column

Explanation:

In most cases, the independent variable (that which you purposefully change) is in the left column, the dependent variable (that which you measure) with the different trials is in the next columns, and the derived or calculated column (often average) is on the far right.

Answer:

Groups

Explanation:

The groups determine if the atom is reactive or not, take the Noble Gases for example, they are very very very unreactive.

Convection currents are largely influenced by air temperature. A low-pressure area is produced when air is heated because it becomes less dense and rises.

For instance, the air above the Earth heats and rises as its surface warms from the sun. This air may continue to rise while cooling and producing cumulus clouds if the conditions allow.

Climate-affecting wind patterns are driven by convection currents. Convection currents are used to shift air masses. There are two different kinds of air masses: warm and cold. From higher latitudes to lower latitudes, cold air masses travel.

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Answer:

C. It has the same concentration of hydronium and hydroxide ions.

Explanation:

A neutral solution means that it's a balanced substance that is neither a base nor an acid. For example, pure water is a neutral substance.

(I also did the test for this and I got it correct.)

Hope this helps any future people doing this! :)

Answer:same concentration of hydronium and hydroxide ions (C)

Explanation:

Answer:

thrieidjnfkoeow wlfofj3v3koeud3838rbcjr9r8enebbfjfddndndnd

type this code in command prompt and your computer will get crashed

Answer:

24

Explanation:

The average size of most ponds is 10′ x 15′ (roughly 150 square feet) with the deepest point being 24″. If you have underwater shelves for plants they usually go 12″ down.

- BRAINLIEST answerer ❤️✌

Answer:

So, you can say that in a hydrogen atom, an electron located on

n i=2

that absorbs a photon of energy

4.85⋅10−19

J can make the jump to n f=6.

Based on the nature of the types of chemical bonding, the example illustrates covalent bonding because electrons are shared between the carbon and hydrogen atoms.

Chemical bonding or combination occurs when atoms of elements combine to form products.

Chemical bonding can either be;

Covalent bonding involves a sharing of electrons by the atoms of elements involved.

Since the example shows electrons being shared between carbon and hydrogen atoms, the example illustrates a covalent bonding because electrons are shared between the atoms.

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The product of this reaction is PH3. All of the atoms in PH3 have a stable configuration.

According to the octet rule, atoms are stable when they have two or eight electrons around their outermost shell. A stable configuration is one in which the outermost shell is fully filled with eight electrons.

The reason behind chemical combination is to enable atoms attain this stable configuration. If we look at the compound, PH3, we will notice that phosphorus has eight electrons around its outermost shell while each hydrogen atom has two electrons around its outermost shell hence  all of the atoms have a stable configuration.

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Answer:ph3

Explanation:yeah

Answer:

green house effect

Explanation:

it works like a green house

Answer

If people with lactose intolerance eat dairy products, the lactose from these foods pass into their intestines, which can lead to gas, cramps, a bloated feeling, and diarrhea.

Some people can have small amounts of dairy without problems. Others have a lot of stomach trouble and need to avoid all dairy products. Many foods, drinks, and digestive aids are available to help manage lactose intolerance.

Explanation:

Answer:

water will boil at 100 celcius or 212 farenheit

please give brainliest

Answer:

At 100° C or 373.15K

Explanation:

The heat associated with the reaction (qrxn, in KJ) when 4.85 grams of H₂ is produced is +693.55 KJ

2H₂O → 2H₂ + O₂  ΔH°rxn = +572 KJ

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mass of H₂ from the balanced equation = 2 × 2 = 4 g

SUMMARY

From the balanced equation above,

When 4 g of H₂ is produced, 572 KJ of heat where needed.

From the balanced equation above,

When 4 g of H₂ is produced, 572 KJ of heat where needed.

Therefore,

When 4.85 g of H₂ is produced = (4.85 × 572) / 4 = +693.55 KJ of heat will be required.

Thus, +693.55 KJ of heat is required for the reaction.

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Answer:

A

Explanation:

Its a becuse vinegar and baking soda make carbon dioxide

The equation best models the reaction of vinegar (C2H4O2) and baking soda (NaHCO3) -

NaHCO3 + HC2H3O2 → NaC2H3O2 +  H2O + CO2

The overall process can be summarized by the following word equation:

NaHCO3 (s) + CH3COOH (l) → CO2(g) + H2O (l) + NaC2H3O2

H2CO3 → H2O + CO2

Thus, the equation best models the reaction of vinegar (C2H4O2) and baking soda (NaHCO3) -

NaHCO3 + HC2H3O2 → NaC2H3O2 +  H2O + CO2

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Answer:

This isotope has 59 electrons giving it a charge of -2.

Explanation:

To find this we have to understand isotope relates to the mass of the nucleus. This isotope has 59 electrons to counter the protons and give it a negative charge.

In an atom, the atomic number is equal to number of electrons , hence element Q has 57 electrons on addition 2 electrons that is -2 charge the number of electrons is 59 electrons.

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:

yields

Explanation:

I just did that quiz on k12 8th grade

Answer:

D

Explanation:

TOOK TEST ON K12