solve find the value of x​

Answer:

C

ok please mark me brainlist

Answer:

did not

Explanation:

ask

Answer:

False. Answer in pic above

In fact protons have no role in chemical reactions. The regrouping of atoms itself forms the new products in chemical reactions. The reactions involves the loss/gain or sharing of electrons.

A chemical reaction is a chemical change in which two or more atoms combine together to form a new product or a compound decomposes to form its constituent compounds. This  involves breaking or making of bonds.

In a chemical reaction, no change occurs in the nuclear composition but the valence electrons are involved in the reaction. Atoms loss or gain electrons or share valence electrons with other atoms to form ne compounds.

The electrostatic force of attraction or the overlapping of atomic orbitals make the new products in a chemical reaction. Hence, the statement is false.

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density = 2.013g/cm3

Explanation:

density = mass/volume

density = 453g/225cm3

density = 2.013g/cm3

Answer:

Ni^2+

Explanation:

The following data were obtained from the question:

Proton = 28

Electron = 26

Neutron = 34

Next, we shall determine the atomic number of the element.

Atomic number of an element is simply defined as the number of protons in the atom of an element.

Thus,

Atomic number = proton number

Proton = 28

Atomic number = proton number = 28

Atomic number = 28

Therefore, the element is Nickel since no two elements have the same atomic number.

Finally, we shall determine the charge on the Nickel atom as follow:

Proton = 28

Electron = 26

Charge on atom =

Charge on atom = Proton – Electron

Charge on atom = 28 – 26

Charge on atom = +2

Therefore, we can represent the Particle as Ni^2+

Answer:

D.

Explanation:

A. is double replacement. Ex. AX + BY -> AY + BX

B. is synthesis Ex. A + B -> AB

C. is synthesis

D. is Single replacement -> A + BX -> Ax + B

- Study definitions and examples of these and that will help.

When zinc react with sulfuric acid, then zinc sulphate is formed.  Zn + H₂SO₄ → ZnSO₄ + H₂ this reaction is replacement reaction.

One element in a molecule is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.

One element in a compound is switched out for another in a single replacement reaction. In a double-replacement process, the anions or cations of two ionic compounds are switched. In a double-replacement reaction known as a precipitation, a solid precipitate is one of the products.

One ingredient replaces another comparable element in a compound in a single-replacement reaction.

Thus, option D is correct.

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Answer:

The answer is ice water, since the particles of a solid have very low kinetic energy.

Explanation:

Answer:

Iced water.

Explanation:

It's a solid. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy.

As water freezes, it does so because after thermal energy leaves the particles, the average translational+rotational kinetic energy decreases, but the total average kinetic energy does not... and the temperature does not change either.

Answer:

c5mvmifvidvj8dvj9r kf9,g

Answer:

it provides oxygen for the human to breathe

Explanation:

During photosynthesis plants absorbs carbon dioxide from the atmosphere and release oxygen into the air. Hence, it increases the level of oxygen for breath.

Photosynthesis is a biological process by which green plants produce energy and molecular oxygen in leaf by the aid of light energy. The photoactive pigments chlorophyll in green leaves absorbs light energy sufficient for this process.

The photosynthetic reaction involves combination of carbon dioxide and water to form glucose and oxygen as written below:

[tex]\rm 6H_{2}O + 6CO_{2} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}[/tex].

Therefore, photosynthesis decrease the level of carbon dioxide and increase the level of oxygen in the air . Thus, plant biomass helps us to provide oxygen to breath.

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Burning and other changes in matter do not destroy matter. The mass of matter is always the same before and after the changes occur. The law of conservation of mass states that matter cannot be created or destroyed

The thing that is happen in a food sample as it is burned is the chemical and physical change.

Comubustion reactions are those reactions in which organic compound get burnt in the presence of oxygen for the formation of carbon dioxide gas and water molecule.

If the food sample contains the organic compound then it will convert into water and carbon dioxide gas and if it contains the matter in the form of inorganic compounds then it will convert into another product but having the same mass.

Hence if matter of food sample is burned then it will convert into small products as a result of physical or chemical change.

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What are the choices? I'll answer once you tell me those

Answer:

sunlight is an abiotic factor

Explanation:

Answer: 4

Hope this helps!

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Answer:

C option is the correct answer

Answer:

A

You do not know if the advertisement is lying to you. Controlled experiments will be biased and personal websites will say what they think, not following the data & science.

Options are provided in the given question, so the complete question is as follows:

Laboratory equipment is cleaned and properly stored after use primarily so that —

A. chemical products can be measured and recorded as data

B. time is saved in setting up the next experiment

C. toxic materials can be kept in the laboratory

D. the possibility of contamination in the laboratory is minimized

Answer:

D. the possibility of contamination in the laboratory is minimized

Explanation:

After the completion of experiments, all the laboratory equipment should be cleaned and properly stored to minimize the possibility of contamination in the laboratory.

Any contamination in the laboratory can affect the experiment and will not give an accurate result, so it is important to clean and store the equipment properly.

Hence, the correct answer is "D".

Answer:

their correct

Explanation:

your answers are correct

Answer:

An alkali metal present in period 2 have larger first ionization energy.

Explanation:

Ionization energy:

The amount of energy required to remove the electron from the atom is called ionization energy.

Trend along period:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

Trend along group:

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.

As the size of atom increases the ionization energy from top to bottom also  decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.  Thus alkali metal present in period 2 have larger ionization energy because of more nuclear attraction as compared to the alkali metal present in period 4.

Answer:

Conducting experiments and using the scientific method.

Explanation:

Scientists (and other people) test hypotheses by conducting experiments. The purpose of an experiment is to determine whether observations of the real world agree with or conflict with the predictions derived from a hypothesis. If they agree, confidence in the hypothesis increases; otherwise, it decreases.

Answer:

the answer is  7.936X 10⁻⁷kg.... the unit for volume must be cm³

Explanation:

we know,

ρ =m/v

given,

ρ =19.84/1000X(100)²= 1.984X10⁻⁶kg/m²

V (volume of the container means the volume of the element)=2.5 m³

NOW putting in the equation

1.984X10⁻⁶/2.5=m

or, m=7.936X 10⁻⁷kg(ANS)

thank u(i am not 100% sure but think it shoud be the answer)

Answer:

kilo gram

Explanation:

kilogram(kg)

Answer:

Kilogram (Kg).......

Answer:

Yes, the given instance is an example of a trade-off.

Explanation:

Answer:

meter

Explanation:

Answer:

they repel each other

Explanation:

A is the ans

Answer:

The density of the pebble is 0.483g/mL (rounded), but it's 0.48333333333333 without rounding. Hope this helped! :)

Explanation:

Volume= 6.0mL                                           Density=Mass/Volume

Mass= 2.9g

D=2.9g/6.0mL

D=0.48333333333333g/mL

    or

D≈0.483g/mL

Answer:

OH-

Explanation:

it's consists of an oxygen and hydrogen atom held together by a covalent bond and carries a negative electric charge

Answer:

chalk

Explanation:

most of them are utensils

Answer:

Formal

Explanation:

Answer:

I think its formal because the question looks a bit fancy by using all the present perfect tense..

hope this helped you

please mark as the brainliest ( if its correct)(ㆁωㆁ)

Answer:

Explanation:

A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.

As an acid

Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O

As a base

3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O

NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water