I need help pls! :[​

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:

exposure to radiation i think

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:

A) The chemical formula is K2S, and the name is potassium sulfide. Explanation:

edge

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:

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]

.

Work completed : 15 J

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

W = F x d  

W = Work, J, Nm  

F = Force, N  

d = distance, m  

Force=F= 5 N

Distance=d=3 m

Work :

[tex]\tt W=5\times 3\\\\W=15~J[/tex]

Answer:

Gas/vaporization

Explanation:

The most stare has the high volume is the gas state. So the answer is between vaporization and sublimation

Answer:

Submilation

Explanation:

Answer:

b

Explanation:

I think B because its saying that perhaps watering with salt water would make them grow faster, you don't know yet unless tested.

Answer:

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

Answer:

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

Answer:

Increase.

Explanation:

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

Hope this helped!

Answer:

I am pretty sure that the answer is 20%

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.

To learn more about chemical formula, refer to the link below:

https://brainly.com/question/11995171

#SPJ5

Answer: K2SO4 + 2H2O

Explanation:

I got it right

Answer:

K2SO4 + 2H2O

Explanation:

Answer: any answer choices

Explanation:

Answer:

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

Answer:

its b beacuse different things have different mass

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!

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.

Read related link on:

https://brainly.com/question/18731255

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.

Learn more: https://brainly.com/question/19182491

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:D. Solid

Explanation:

A. Disorganized

B. Amorphous

C. Liquid

D. Solid

Answer:

by mixing red and yellow

Explanation:

Answer:

Either the sun or by mixing red and yellow together because they make orange.

Explanation:

Brainliest pls

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

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:  

A: cold, cyclonic wind

B: deep ocean water

C: cold ocean water

E: warm ocean water

F: a strong cold front​

You only need A, B, C, E, F not D because that for tornadoes buddy.

energy which a body possess by virtue of being in motion

ex: a river flowing at a certain speed comprises kinetic energy as water has a certain velocity and mass

Answer:

Explanation:

The number of moles of glucose can be found by using the formula

[tex]n = \frac{m}{M} \\ [/tex]

where

n is the number of moles

M is the molar mass

m is the mass of the substance

First we must find the molar mass of glucose

[tex]M(C) = 12 , \: \: \: M( H_2) = 1 \: \: , \: \: M(O_2) = 16 \\ [/tex]

The molar mass of glucose is

[tex]M(C_6H_{12}O_6) = (12 \times 6) + 12 + (16 \times 6) \\ = 72 + 12 + 96 \\ \\ = 180 \: \: g/mol \: \: \: [/tex]

mass = 640 g

So we have

[tex]n = \frac{640}{180} = \frac{64}{18} = \frac{32}{9} \\ = 3.5555..[/tex]

We have the final answer as

Hope this helps you

Answer:

a and b

Explanation: