glass
Which chemical or physical change is an
exothermic process?
O the baking of cookies
o the combustion of gasoline
O the evaporation of water from a pool
the cold pack reaction
(NH4NO3 + H2O+heat → NH, OH + HNO3)
DONE

Answer:

240g

Explanation:

Using the equation m=pV, where m=mass, p=density, and V=Volume

m=(6)(40)=240

m=240

Answer: fixed shape and volume

Explanation:

i took the quiz so its right

Answer:

Explanation:

The number of formula units can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.002 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

answer

Explanation:

Ionic bond is a type of chemical bond that attract between oppositely charged ions.

Answer:

410.196 J/[kg*°C].

Explanation:

1) the equation of the energy is: E=c*m*(t₂-t₁), where E - energy (523 J), c - unknown specific heat of copper, m - mass of this copper [kg], t₂ - the final temperature, t₁ - initial temerature;

2) the specific heat of copper is:

[tex]c=\frac{E}{m*(t_2-t_1)}; \ => \ c=\frac{523}{0.085*(45-30)}=\frac{523}{1.275}=410.196[\frac{J}{kg*C}].[/tex]

Answer:

I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced

Explanation:

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.

The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

For more information about earthquake, refer to the link:

https://brainly.com/question/1296104

Answer:

3Mg+2FeCl3------------3MgCl2+ 3Fe

X=10

Explanation and workout is in the photo attached with this answer

The formula mass of hydrated sodium sulfate is Na₂SO₄.10H₂O. The value of x is equal to 10.

A mole is the amount of substance containing the same number of elementary entities as the number of atoms present in a pure sample of any element.

A mole is also described as the amount of a substance that contains 6.022×10²³ fundamental entities of the given substance.

The mole concept is a convenient method of representing the amount of a substance.

Given, the mass of the hydrated sodium sulfate = 10.0g

The mass of the anhydrous sodium sulfate is produced = 4.40g

Mass of the water evaporated as water on heating = 10.0 - 4.40 = 5.6g

The number of moles of water = 5.6/18 = 0.31 mol

Similarly, the number of moles of sodium sulfate = 4.4/142.04 = 0.031 mol

The ratio of the number of the moles of the sodium sulfate and water:

[tex]\frac{n(H_2O)}{n(NaSO_4)}=\frac{0.31}{0.031} = 10[/tex]

Therefore, the ten moles of water will be evaporated for the one mole of sodium sulfate. Therefore, the formula mass is Na₂SO₄.10H₂O.

Learn more about the mole concept, here:

https://brainly.com/question/22540912

#SPJ2

Taking into account the definition of calorimetry, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body can receive or give up without affecting its molecular structure. If the molecular structure does not change, the state (solid, liquid, gaseous) does not change. Since the molecular structure does not change, a change in temperature is observed.

In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case, you know:

Replacing in the expression to calculate heat exchanges:

1800 J= 4.18[tex]\frac{J}{gC}[/tex]× 5 g× ΔT

Solving:

1800 J ÷ (4.18[tex]\frac{J}{gC}[/tex]× 5 g)= ΔT

ΔT= 86.12 C

In summary, the change in temperature of a 5.0 g sample of water that loses 1800J of heat energy is 86.12 C.

Learn more:

Explanation:

divide the weight in grams by the atomic mass from the periodic table, then multiply the result by Avogadro's number..

Hope this works!!

Answer:

i need an aswer for this question too

Explanation:i think the balanced net equation is s0sr4 but thats probably wrong lol

[tex]\huge\underline\mathtt\colorbox{cyan}{A. Element L}[/tex]

Explanation:

Because the unidentified element has exactly the same Bright-Line Spectra of wavelength in nanometeres as does element L.

[tex]\huge\bold{\purple{\bold{⚡BeBrainly⚡}}} [/tex]

The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.

BALANCING EQUATION:

4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl

Learn more at: https://brainly.com/question/21049751?referrer=searchResults

Answer:212

Explanation:yeah

Answer:

The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.

Answer:

im only good at math

Explanation:

Answer: As K+ is a very weak conjugate acid of KOH, hence it has no ability to react with either OH– ion or with water molecules ions.

Explanation: Name of Molecule Potassium hydroxide

Chemical formula KOH

pH value 12 to 13

Conjugate acid K+

Answer: bro- i have no idea wat science that is but heres the water cycle-

noooooooooooooooooooooo

Explanation:

If the pH is between 0 and 7, then we have an acid.

If the pH is between 7 and 14, then we have an alkaline base.

If pH = 7, then it's neutral.

Answer:

0-7

Explanation:

Hope this helps!

Answer:

0.25

Explanation:

no.of moles =10/40

Answer:

c

Explanation:

beacause Câu 1: Trình bày phương pháp hóa học nhận biết

Answer:

In simple terms, the endothermic reactions absorb energy from the surrounding that is in the form of heat. On the other hand, an exothermic reaction releases energy into the surrounding of the system. A popular example of an endothermic chemical reaction is photosynthesis.

(i searched in g o o gle)

Answer:

Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.

Explanation:

OR USE GATORADE AND POWERADE. BE A MAN.

Answer:

When a substance is heated ,the kinetic energy of its molecules also increase.

Explanation:

K.E is directly proportional to T

Based on the balanced equation, the mole ratio of Iron to Sulphur is 8 to 1.

This means that for every mole of sulfur, 8 moles of iron is needed for the reaction.

∴ since the moles of Sulfur = 8.49 moles

                 ⇒ moles of Iron = 8.49 moles × 8

                                            = 67.92 moles