someone help me please i’ll give brainly

Answer:

Beryllium

Explanation:

Given parameters:

Number of protons = 4

Number of neutrons  = 5

Number of electrons  = 4

Unknown:

Element = ?

Solution:

To determine an element, the atomic number is the most important identifier.

The atomic number is the number of protons in an atom.

Since the atom here has a proton number of 4, checking on the periodic table, it is Beryllium, Be

Answer:

mass number

Explanation:

The sum of the protons and neutrons in an atom equals the mass number of such an atom.

So;

Mass number = number of protons + number of neutrons.

Answer:

The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring. In order for a reaction to take place, there must be a change in the elemental composition of the substance in question. Thus, we shall simply refer to physical "reactions" as physical changes from now on.

Introduction

Physical changes are limited to changes that result in a difference in display without changing the composition. Some common changes (but not limited to) are:

Texture

Color

Temperature

Shape

Change of State (Boiling Point and Melting Point are significant factors in determining this change.)

Physical properties include many other aspects of a substance. The following are (but not limited to) physical properties.

Luster

Malleability

Ability to be drawn into a thin wire

Density

Viscosity

Solubility

Mass

Volume

Any change in these physical properties is referred to as a physical change. For further information, please refer to Properties of Matter.

Chemical changes, on the other hand, are quite different. A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs. The following are indicators of chemical changes:

Change in Temperature

Change in Color

Noticeable Odor (after reaction has begun)

Formation of a Precipitate

Formation of Bubbles

Note: When two or more reactants are mixed and a change in temperature, color, etc. is noticed, a chemical reaction is probably occurring. These are not definite indicators; a chemical reaction may not be occurring. A change in color is not always a chemical change. If one were to change the color of a substance in a non-chemical reaction scenario, such as painting a car, the change is physical and not chemical. This is because the composition of the car has not changed. Proceed with caution.

Answer:

d. the strength of the forces between its atoms​

Explanation:

The strength of the intermolecular forces between the atoms of the pure substance will determine the type of substance it is when heated to 100°C.

Answer:

633.5

Explanation:

The total presser is 650.00 mmHg, and it is collected over water, which at 19c is 16.5 mmHg. Therefore, to get the total pressure of H2 you would subtract the partial pressure of water from the total pressure.

650-16.5=633.5

633.5 mmHg is the pressure of hydrogen gas formed in mmHg.

According to the Dalton's law of partial pressure, the total pressure of a gas mixture is the sum of all the partial pressure of the individual gases present in the mixture of gases.

Hence;

Total pressure = pressure of hydrogen gas + vapour pressure of water

pressure of hydrogen gas = Total pressure - vapour pressure of water

vapour pressure of water at 19°C = 16.5 mmHg

pressure of hydrogen gas =  650.0 mmHg - 16.5 mmHg

pressure hydrogen of gas =  633.5 mmHg

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Answer:Hey there

Here are 50 simple balanced chemical equations...

1) 2Fe2O3+3C--->4Fe+3CO2

2)H2SO4+

CaCO3--->CaSO4+H2CO3

3) 2H2+02--->2H20

4) CH3COOH+

C2H5OH ---> CH3COOC2H5

+H2O

5) 1 AgNO3 + 1 LiOH --> 1 AgOH + 1 LiNO3

6) CH4+2O2--->CO2+2H2O.

7) Sn+2H2SO4-->SnSO4+2H2O

+SO2

8) CuO+H2SO4--->CuSO4+H2

9) Mg3N2 + 3H2O ---> 3MgO + 2NH3

10) N2 + O2 ---> 2 NO

11) 2 CH4 + 3 O2 ---> 2 CO + 4 H2O

12) 6 CO2 + 6 H2O ---> C6H12O6 + 6 O2

13) 2 AgI + Na2S ---> Ag2S + 2 NaI

14) Ba3N2 + 6 H2O --->

3 Ba(OH)2 + 2 NH3

15) 4 FeS + 7 O2 --->2 Fe2O3 + 4 SO2

16) PCl5 + 4 H2O ---> H3PO4 + 5 HCl

17) 3 CaCl2 + 2 Na3PO4--->Ca3

(PO4)2 + 6 NaCl

18) 2 As + 6 NaOH --->2 Na3AsO3 + 3 H2

19) 12 HClO4 + P4O10 ---> 4 H3PO4 + 6 Cl2O7

20) 10 KClO3 + 3 P4 ---> 3 P4O10 + 10 KCl

21) SnO2 + 2 H2 ---> Sn + 2 H2O

22) 3 KOH + H3PO4 ---> K3PO4 + 3 H2O

23) 3 Hg(OH)2 + 2 H3PO4 ---> Hg3(PO4)2 + 6 H2O

24) 2 KNO3 + H2CO3 ---> K2CO3 + 2 HNO3

25) Na3PO4 + 3 HCl ---> 3 NaCl + H3PO4

26) TiCl4 + 2 H2O ---> TiO2 + 4 HCl

27) C2H6O + 3 O2 ---> 2 CO2 + 3 H2O

28 4 NH3 + 5 O2 ---> 4 NO + 6 H2O

29) B2Br6 + 6 HNO3 ---> 2 B(NO3)3 + 6 HBr

30) 8 CO + 17 H2 ---> C8H18 + 8 H2O

31) 4 NH4OH + KAl(SO4)2·12H2O ---> Al(OH)3 + 2 (NH4)2SO4 + KOH + 12 H2O

32) 2 Fe + 6 HC2H3O2 ---> 2 Fe(C2H3O2)3 + 3 H2

33) N2+3H2--->2NH3

34) N2 + 3H2 ---> 2NH3

35) Al2O3+3H2SO4--->Al2

(SO4)3 +3H2O

36) HCl+NH3--->NH4Cl

37) 2Na + 2H2O = 2NaOH + H2

38) C6H12O6--->6C+6H2O

39) CuO+H2SO4--->CuSO4+H2

40) COH12O6--->2CO2

+2C2H5OH

41) FeCl3+Fe2O3--->3FeOCl

42) NaCl+AgNO3--->NaNO3

+AgCl

43) HCl+NH3--->NH4Cl

44) 2Al+6HCl--->2AlCl3+3H2

45) Ca + 2HCl = CaCl2 + H2

46) CaCO3 + H2SO4 = CaSO4 + H20 + CO2

47) 3H2SO4 + 2Fe ---> Fe2(SO4)3 + 3H2

48) Mg3N2 + 3H2O ---> 3MgO + 2NH3

49) CH4+ O2 ---> CO2 + H2O

50) Cl2 + SO2 + H2O ---> HCl + H2SO4

If I have repeated any equation, please do tell me.

Hope this helps you dear!!

Explanation:

Answer:

I am pretty sure that the answer is 20%

Answer:

the first one

Explanation:

Answer:

pretty sure its table salt

Answer:

The answer would be vegetable soup i think.

Hope this helps :D

Answer:

Increase.

Explanation:

All neutralization reactions are actually exothermic (meaning they exude heat).

Hope this helped!

Mass Fe₂(SO₄)₃ : 31.79 g

Reaction

2FePO₄ + 3Na₂SO₄ ⇒ Fe₂(SO₄)₃ + 2Na₃PO₄

mol FePO₄ (MW=150,82 g/mol) :

[tex]\tt \dfrac{24}{150.82}=0.159[/tex]

mol  Fe₂(SO₄)₃ : mol FePO₄ = 1 : 2, so mol Fe₂(SO₄)₃ :

[tex]\tt \dfrac{1}{2}\times 0.159=0.0795[/tex]

mass Fe₂(SO₄)₃ (MW=399,88 g/mol) :

[tex]\tt 0.0795\times 399,88 g/mol=31.79~g[/tex]

Answer:

exposure to radiation i think

Explanation:

% m/v of the solution = 0.2%m/v

[tex]\tt Percent~m/v=\dfrac{mass~solute(g)}{volume~solution(ml)}\times 100\%[/tex]

or

% m/v = g solute / 100 ml solution

Concentration : 2 g sodium borate / L water

For 10 L⇒20 g Sodium borate

[tex]\tt \%m/v=\dfrac{20~g}{10,000~ml}\times 100\%\\\\\%m/v=0.2\%[/tex]

Answer:

The correct answer is from areas of high concentration to low concentration.

Explanation:

A concentration gradient exists for these molecules, so they have the potential to diffuse into (or out of) the cell by moving down it.

Hope this Helps!

Answer:

A. Some forces cause objects around us to move,

C. Every force can be identified as one of the fundamental forces,

D. Force is the ability to change motion and transfer matter,

Explanation:

Force basically is defined as pull or push on a body. Forces are known to cause the change in motion of a body as the amount of force applied is attenuated.

Answer:

D

Explanation:

Answer: K2SO4 + 2H2O

Explanation:

I got it right

Answer:

K2SO4 + 2H2O

Explanation:

Answer:

Condensation

Explanation:

When thermal energy is added ti a substance the temperature rises, this causes solids to melt, liquid ti evaporate, or a solid to sublimate. when the pressure is applied to a substance, it can cause thus substance to condense.

Answer:

New volume V2 = 120.4 ml

Explanation:

Given:

Pressure P1 = 1.12 atm

New pressure P2 = 1.12[1+0.25] = 1.4 atm

Old volume V1 = 150.5 ml

Find:

New volume V2

Computation:

P1V1 = P2V2

(1.12)(150.5) = (1.4)(V2)

V2 = 120.4 ml

New volume V2 = 120.4 ml

Mass of X produced : D. 4.6 g

Reaction

Decomposition of Magnesium nitrate into Magnesium oxide, Oxygen, and Nitrogen oxides

2 Mg(NO₃)₂ → 2 MgO + 4 NO₂ + O₂

mol Magnesium nitrate-Mg(NO₃)₂(MW=148,3 g/mol) :

[tex]\tt \dfrac{7.4}{148.3}=0.05[/tex]

mol ratio Mg(NO₃)₂ : NO₂ = 2 : 4, so mol  NO₂ :

[tex]\tt \dfrac{4}{2}\times 0.05=0.1[/tex]

mass NO₂(MW=46 g/mol) :

[tex]\tt 0.1\times 46~g/mol=4.6~g[/tex]

.

Answer:

energy goes into the chemical and cool downs the surrounding area.

Answer:

Compare qualitative and quantitative physical properties. Use examples of properties listed in Tables 4.2 and .3 as part of your answer

can be observed and described without detailed measurement, usually obvious and easy to observe. For example, odor can be described as sweet, pungent and or moldy.

Quantitative Physical Properties

can be measured and assigned a value, for example melting points and boiling points could be considered a quantitative physical property

Why is the melting point considered a physical property?

Because you are not creating a new substance in the process of melting it. If you melt gold, it will still remain gold just in a different form.

What property determines the choice of material that is used for the inside of an electrical wire and the material that is used for the outside of the wire?

The conductivity of the material will determine the material needed for both the inside and outside of an electrical wire. The electrical wires ability to conduct electricity, or give off heat will allow us to have an idea as to what type of material may insulate or protect the electrical wire.

When might a large volume of material have little mass?

When the material weighs less. For example, Styrofoam with the volume of 500 cm (cubed) has a smaller mass in comparison to 500 cm (cubed) of Gold. Since the density in Styrofoam is little, the mass of it would also be little in contrast to an element like gold, which has a higher density therefore it has a higher mass.

Gold has a density of 19.3g/cm (cubed). Iron pyrite, commonly known as fool's gold because of its color, has a density of 5.02g/cm (cubed). Suppose you find a golden solid that has the mass of 25.04g and a volume of 4.99 cm (cubed). Have you found gold or iron pyrite?

Do the math

The density of red wine vinegar is 1.01g/cm (cubed), and the density of olive oil is 0.92g/cm (cubed). A salad dressing consisting of these two ingredients was left sitting too long. The ingredients separated in the bottle. Which ingredient is in which layer?

do the math

Water is unique because the density of its solid, ice, is less than the density of its liquid. Describe how life would be if this were not true.

think about it and say it out loud

Answer:

{CH4 +2O2 ->CO2 + 2H2O}}}

Answer:

CH4 + 202----->CO2 + 2H2O

Answer:

D. All of the above

Fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.

Chemical formula is defined as a chemical elements numbers and symbols are used to provide information about the chemical quantities of atoms that make up a certain chemical compound or molecule.

It is also defined as any of numerous statements of a chemical compound's content or structure.

There are mainly three types of chemical formulas.

Thus, fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.

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The iron has become part of a A. compound with the sulfate, which must be separated through chemical methods.

Iron (II) sulfate is also referred to as ferrous sulfate is a reducing agent. The hydrates form is used for the treatment of iron deficiency.

It should be noted that a chemical change is involved in the formation of iron (II) sulfate. It can't be separated by physical means and isn't reversible.

In this case, iron (II) sulfate will be separated by chemical methods.

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Iron sulfate is a compound which can be separated through chemical methods.

Iron is present in a compound form with the sulfate, which must be separated through chemical methods because both iron and sulfate reacts with each other through making of chemical bonds with each other. Those elements that combine with each other chemically at a fix ratio can be separated from each other through chemical methods.

While on the other hand, in mixture substances combine with each other physically so they can be separated from each other through physical methods so we can conclude that iron sulfate is a compound which can be separated through chemical methods.

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