CaCO3 Calcium oxide and carbon dioxide

Answer:

-171.79 KJ

Explanation:

We must keep in mind that water freezes at 0 degrees centigrade

Recall that heat lost during freezing can be obtained from;

H = mc(θ2 - θ1)

m = mass of the water = 350 g/1000 = 0.35 Kg

c = specific heat capacity of water = 4,200 J/kg°C

θ2 = final temperature = 0°C

θ1 = initial temperature = 37°C

H= 0.35 * 4,200 * (0 - 37)

H = -54390 J = -54.39 KJ

Energy given out when 1 mole of water freezes at its freezing point = -6.04 kJ

For 350 g of water; 350 g/18 g/mol *  -6.04 kJ  = -117.4 kJ

Hence total energy removed = (-54.39 KJ) + (-117.4 kJ) = -171.79 KJ

Answer:

3 we have three states of matter

Answer:

We have THREE (3) states of matter namely;

*Solid state

*Liquid state

*Gaseous state

Answer:

This did not change the latex/composition of the balloon it just filled and went out.

Explanation:

Its the same way you fill a container without it being a chemical change.

Answer:

Do you want someone to go through and answer all of these questions??

Explanation:

I am on the dox, but idk if I could finish it fast enough to put the link in here. Is there a way to delete answers?

Answer:

A

Explanation:

Hopefully this helps

What, if anything, is wrong with the nuclear equation shown below?

a. the daughter product has the wrong atomic number.

b. The daughter product has the wrong mass number.

c. The particle labeled "e" should have a mass number of 1.

d. There is nothing wrong with the equation.

Answer:

a. the daughter product has the wrong atomic number.

Nice written.

Is it written by you yourself or you have copied it from somewhere?

A moist red litmus paper is used for testing ammonia gas  because ammonia is a base which turns moist red litmus paper blue.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

Learn more about base,here:

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Answer:

2.3 * 1,000 = 2,300

Explanation:

Cl2 + 2RbI → 2RbCl + I2  is possible while I2 + NiBr2 → NiI2 + Br2 is not possible.

It will do us a lot of good to write out the equations again;

Cl2 + 2RbI → 2RbCl + I2       Yes

I2 + NiBr2 → NiI2 + Br2         No

If we look at the reaction closely, they are displacement reactions. It is worthy to note that a specie can only displace another specie which lies below it in the activity series. The activity series is an arrangement of elements in order of decreasing reactivity.

The activity series of the halogens is; fluorine > chlorine > bromine > iodine.

Since chlorine is above iodine in the activity series, Cl2 + 2RbI → 2RbCl + I2 is possible.

Iodine is less than bromine in the activity series hence the reaction  I2 + NiBr2 → NiI2 + Br2 is not possible.

Learn more: https://brainly.com/question/14365792

Answer:

Cl2 + 2RbI --> 2RbCl + I2 = yes

I2 + NiBr2 --> NiI2 + Br2 = no

Explanation:

I just took the assinment

Answer:

532 moles of O atoms.

Explanation:

Given data:

Number of moles of oxygen atom present = ?

Number of molecules of N₂O₅= 6.41×10²⁵ molecules

Solution:

First of all we will calculate the number of moles of N₂O₅.

1 mole = 6.022×10²³ molecules

6.41×10²⁵ molecules × 1 mol /6.022×10²³ molecules

106.4 mol

Number of atoms of O:

1 mole of N₂O₅ contain 5 moles of O atoms.

106.4×5 = 532 mol

A decrease in velocity occurs at point D to E in the given displacement - time graph.

Velocity is defined as the time rate of change of displacement with time. It is measured in meters per second.

A decrease in velocity occurs when there is a small change in displacement at a large amount of time.

v = Δx/Δt

v = (60 - 40)/(60 - 40) = 1 m/s

v = (60 - 60)/(80 - 60) = 0 m/s

Thus, a decrease in velocity occurs at point D to E in the given displacement - time graph.

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Answer:

An ionic bond is formed when a metallic element and a non-metallic element form a compound.

Explanation:

As you may know, each atom contains a set amount of electrons. For example, Hydrogen has one electron, helium has two electrons, lithium has three electrons and so on.

Electrons come in shells. The first shell can hold 2 elections at most, and each shell past this point can hold 8 electrons. When an atom has a filled outer shell, it is considered stable. (This so why the noble gases are unreactive- they have a full outer shell of electrons.)

This is why compounds can form- it is the chemical bonding of 2 or more chemical elements: take NaCl, sodium chloride, or SO2, sulphur dioxide.

You specifically asked about ionic bonds. Ionic bonds, as expressed above, form between a compound of a metallic and non metallic element.

Let's take sodium chloride as an example. Sodium has 1 electron in its outer shell and chlorine has 7. Both need a full outer shell to become stable. Because of this, the sodium atom loses its only electron in its outer shell to become a sodium ion and the chlorine atom gains the electron to become a chlorine ion as well. Because of this, both ions have a full outer shell, rendering them stable.

Now, because the sodium ion is short of one electron, it has more protons than electrons, resulting in it having a positive charge. The chlorine ion is the opposite, having a negative charge.

Answer:

1.33 × 10²⁴ molecules CO₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

97.3 g CO₂

Step 2: Define conversions

Avogadro's Number

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol

Step 3: Convert

[tex]97.3 \ g \ CO_2(\frac{1 \ mol \ CO_2}{44.01 \ g \ CO_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ CO_2}{1 \ mol \ CO_2} )[/tex] = 1.33138 × 10²⁴ molecules CO₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules.

1.33138 × 10²⁴ molecules CO₂ ≈ 1.33 × 10²⁴ molecules CO₂

Answer: No, it is a rule. The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied.

Answer:

a: cells

Explanation:

just did it. your welcome have a nice day

answer :- The smallest unit of life that conducts all life function are cell

Answer:

it is false it cannot be a model

Answer:

A.

Explanation:

Answer:

The charge an element would have if it lost or gained electrons

The half-life of this radioisotope : 12 hr

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

t=48 hr

[tex]\tt \dfrac{Nt}{No}=\dfrac{1}{16}[/tex]

The half-life :

[tex]\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr[/tex]

Answer:

1. earth metal 2. halogen 3.The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.

Inventor: Dmitri Mendeleev please name most brainliest

Answer:

ok how about you answer my question, why would a moderator delete ALL of my answers to peoples questions?! now i have negatove points. smh

Explanation:

ugh sorry -_-

Answer:2.Plants have oxygen in them they also breathe oxygen and help the climate 3.there are all kinds of plants but the very first plant was a tree. 4. You might think plants are genetal normally they are but some types of plants can be very feisty such as the plant that eats stuff like actually opens it mouth some people think this is amazing and can lead to bigger things.! 5. Normally you see the pants normal size like little and pretty but there is enormous plants around the world that can get up to as big as a couch or bigger.

Explanation:

Sorry if I did bad lol

Answer:

no <3

Explanation:

Answer:

brody this aint the place for that daddy;)( no homo tho i aint with that gay stuff)

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question we have

[tex]density = \frac{23.73}{3.0} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

so they can find the aswer and not get hurt

Explanation:

The scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.

Einstein model is called as Einstein solid model. He stated as ever solid atom oscillate with the same frequency and contain large number of three dimensional quantum harmonic oscillation.

Bohr atomic model stated that electron revolve around the nucleus in its stable orbital without emitting radiant energy. It is primitive model of hydrogen atom. Bohr has given the expression l = nh / 2π

Where n = principle quantum number, l = angular momentum and h = plank constant

Thus, the scientist Neil Bohr has investigated the atom to be young and unattached to Albert Einstein thinking because he is fearless of his thinking and ready to find an explanation.

To learn more about Einstein model, refer to the link below:

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Answer:

Pressure decreases with increasing altitude

Explanation:

At higher elevations, there are less air moecules.

Explanation:

The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.

The answer to this is true.

Answer:

1. freshwater and marine.

2. Living parts of plants and animals

3. Only plants

4. Meats and plants

5. Meats

6. Other: (Anything they can find that's edible)

7. Break down dead plants and animals into nutrients

8. Prey

9. Rainfall

10. Deserts

Let me know if this helped! Have a nice day! Tell me if these are correct and if any are wrong!

ΔH for this reaction : -2668.4 (exothermic)

The change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation  

The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)  

(ΔH) can be positive (endothermic = requires heat) or negative (exothermic = releasing heat)  

The value of ° H ° can be calculated from the change in enthalpy of standard formation:  

∆H ° rxn = ∑n ∆Hf ° (product) - ∑n ∆Hf ° (reactants)  

you can search the value of ΔHf on the internet

∆H ° rxn =( ∆H Al₂O₃+∆H AlCl₃+3.∆H NO + 6.∆H H₂O)-(∆H Al+∆H NH₄ClO₄)

[tex]\tt \Delta H^o~rxn=(-1669.8+-704+(3\times 90.4)+(6.\times -241.8)-(3\times 0+3\times -295)\\\\\Delta H6o~rxn=-3553.4+885=-2668.4~kJ/mol[/tex]