Dry ice changes from a solid to a gas in a process known as A. Melting B. Freezing C.sublimation

Answer:

Fossil Fuels are exhaustible natural resources, because they can't be renewed. Once these fuels are used up, there are NONE left! We can change that by reducing the amount we use. It takes millions of years for it to be remade, and we will soon die out before that happens. Thats why fossil fuels are exhaustible. :)

Explanation:

Hope this helps! :)

Answer:

the answer b because

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles AgNO3, or 169.8731 grams.

Explanation:

Explanation:

3Mg(s) + N2(g) = Mg3N2(s)

First check that the equation is balanced. In this case, it is.

Assuming that magnesium is the limiting reactant:

       We find that the atomic mass of magnesium is approximately

       24.3g, so the molecular weight is just 24.3g\mol

    2. Next we need the mole to mole ratio. As there are 3

        magnesiums for 1 magnesium nitride (shown by the coefficients), the                    

        mole to mole ratio is 1 mol Mg3N2\3 mol Mg.

    3. We need the amount of the substance, in grams. Since you have not    

        stated it in the question, I'll just do 10g AS AN EXAMPLE. Note that    

       depending on the amount, the LIMITING REAGENT MAY DIFFER.

   4.  Finally, we need the molecular weight of Mg3N2, which we can easily    

        calculate to be around 100.9\mol.

   5.  Putting this all together, we have 10gMg⋅ (mol Mg\24.3gMg)

        (1mol Mg3N2\ 3mol Mg) (100.9g Mg3N2\mol Mg3N2)

        the units will cancel to leave gMg3N2 (grams of magnesium nitride):

       10gMg ⋅ (mol Mg\24.3gMg) (1mol Mg3N2\3mol Mg)

       (100.9g Mg3N2\mol Mg3N2)

Doing the calculation yields approximately 13.84g.

Assuming that nitrogen is the limiting reactant:

Similarly, following the above steps but with 10g of nitrogen yields 36.04g

In conclusion, as we produce less amount of Mg3N2 when we assumed that Mg was the limiting reagent, magnesium is the limiting reagent and nitrogen is the excess.

Note: This is in THIS CASE, where we have 10g of both. The answer may vary depending on the amount of each substance.

Answer:

  1.46×10^25 molecules

Explanation:

Each mole of N₂ reacts with 3 moles of Mg to form 1 mole of Mg₃N₂. That is, the number of moles of product is equal to the number of moles of nitrogen gas when excess magnesium is present.

There are 6.022×10²³ molecules in each mole of a substance, so the number of molecules of Mg₃N₂ is

  (24.3 mol)(6.022×10²³ molecules/mol) = 1.46×10²⁵ molecules

Answer:

speed = 16 kilometers per hour

= 16 km/h

Explanation:

Mark brainliest plssssss

Answer:

2  L

Explanation:

The volume of Sulfur dioxide-SO₂ at STP : = 102.144 L

Given

4.56 mol Sulfur dioxide-SO₂

Required

The volume

Solution

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

so for 4.56 mol :

= 4.56 x 22.4 L

= 102.144 L

1. 12 L = 12 dm³

2. 3.18 g

Given

1. Reaction

K₂CO₃+2HNO₃⇒ 2KNO₃+H₂O+CO₂

69 g K₂CO₃

2. 0.03 mol/L Na₂CO₃

Required

1. volume of CO₂

2. mass Na₂CO₃

Solution

1. mol K₂CO₃(MW=138 g/mol) :

= 69 : 138

= 0.5

mol ratio of K₂CO₃ : CO₂ = 1 : 1, so mol CO₂ = 0.5

Assume at RTP(25 C, 1 atm) 1 mol gas = 24 L, so volume CO₂ :

= 0.5 x 24 L

= 12 L

2. M Na₂CO₃ = 0.03 M

Volume = 1 L

mol Na₂CO₃ :

= M x V

= 0.03 x 1

= 0.03 moles

Mass Na₂CO₃(MW=106 g/mol) :

= mol x MW

= 0.03 x 106

= 3.18 g

Answer:

welcome to 2021 dude

its been a long time since i answered this but here is my new account

Explanation:

Answer:

genes

Explanation:

Answer:

c

Explanation:

it is c but im not exactly sure

you have a 25% chance tho

sorry

2H₂+O₂⇒ 2H₂O

Given

Chemical equation :

2H₂+O₂⇒

Required

Compound produced

Solution

In determining the product that may be produced is to use the principle of the law of conservation of mass where the number of atoms/elements in the reaction either before the reaction (reactants) or after the reaction (products) is the same so that a balanced chemical equation is formed.

In the above reaction, there are two elements that play a role in the reaction, namely H and O

So that the resulting product also has these 2 elements, so we can ignore options A and C because there are elements C and Cl, while choice B does not contain the element H

The right choice: D

Answer:

C. Alpha

Explanation:

In a nuclear reactor facility, radioactive decay takes place, which is any several processes by which unstable nuclei emit subatomic particles and ionizing radiation and disintegrate into one or more smaller nuclei. A scientist working under this condition is likely to be exposed to alpha particles because it contains a minimal absorption range and they are the least dangerous regarding external exposure.

Answer:

what is the question i could help if u gave me the question but i don't see it  

Explanation:

Explanation:

The more reactive element replaces less reactive element during chemical reaction.

Since, potassium is more reactive than beryllium. When potassium reacts with beryllium choride, it replaces beryllium and forms potassium chloride and produces beryllium.

Beryllium is produced due to the fact that the more reactive element in the reaction would have to take over the element that is less reactive.

In this reaction the element that is more reactive is potassium. When the reaction takes place it would take over and replace beryllium due to this quality.

Hence beryllium chloride would become potassium chloride from the resulting reaction.

Read more on chemical reactions here:

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Answer:

12.92

Explanation:

Answer:   a

Explanation:

2344

The statement that best describes where and why a particular type of rock may be found is that Metamorphic rock may be found at location B, where magma escapes from the area where oceanic crust dives under continental crust.

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.

They are made up of oceanic crust and continental crust. Earthquakes occur around mid-ocean ridges and the large faults which mark the edges of the plates.

Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.

Therefore, The statement that best describes where and why a particular type of rock may be found is that Metamorphic rock may be found at location B, where magma escapes from the area where oceanic crust dives under continental crust.

Learn more about Tectonic Plates, here:

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Mass of Cu : 95.319 g

Given

9.03 x 10²³atoms of Copper

Required

mass of Cu

Solution

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

Mol of Copper :

n = N/No

n = 9.03 x 10²³/6.02.10²³

n = 1.5

Mass of Copper :

= mol x Ar Cu

= 1.5 x 63,546 g/mol

= 95.319 g

9.03 × 10²³ atoms of copper have a mass of 95.3 g.

We want to convert 9.03 × 10²³ atoms of copper to grams. We will need a series of conversion factors.

A conversion factor is an arithmetical multiplier for converting a quantity expressed in one set of units into an equivalent expressed in another.

The required conversion factor is Avogadro's number: there are 6.02 × 10²³ atoms in 1 mole of atoms.

9.03 × 10²³ atoms × (1 mol/6.02 × 10²³ atoms) = 1.50 mol

The required conversion factor is the molar mass of copper: 63.55 g/mol.

1.50 mol × 63.55 g/mol = 95.3 g

9.03 × 10²³ atoms of copper have a mass of 95.3 g.

Learn more about Avogadro's number here: https://brainly.com/question/7287712

Answer:

6amu

Explanation:

mass=proton+neutron

mass of cl2=2(16+16)=64amu

Answer:

It's B.

Explanation:

I got it wrong, it's B

Answer:

c

Explanation:

I know it's c because I have done the test

Answer:

neon 21 ang sagot diyan

Explanation:

iyan ang sagot ko its a frank hindi yan ang sagot ko

Answer:5.02228

Explanation: My bad I put it in scientific notation not standard. Sorry. Heres the right answer

Answer:Iron combines with oxygen to produce rust, which is the compound named iron oxide

Explanation:

Answer:

228.7[tex]dm^{3}[/tex]

Explanation:

According to Boyle's law

P1V1 = P2V2

where P1& P2 are initial and final pressure

and V1& V2 and initial and final volumes respectively.

Given:

P1 = 136atm, P2 = 131.6atm

V1 = 142[tex]dm^{3}[/tex]; V2 = ?

V2 = [tex]\frac{P1V1}{P2}[/tex] = [tex]\frac{136*142}{131.6}[/tex]

= 146.7[tex]dm^{3}[/tex]

Total volume, V = V1 + V2

=146.7 + 142

= 228.7[tex]dm^{3}[/tex]

what are the following things

Metals are good conductors and shows some peculiarities such as luster, ductility, malleability,etc. Brittleness is not associated with metals since they are hard. Hence option A is correct.

Metals are electropositive elements with good conductivity. Metals are classified into the s block and d block of periodic table. Thus alkali metals, alkaline earth metals and transition metals are the classes of metals.

Metals are rich in free electrons thereby, they capable of conducting electrically and thermally. Other features that metals have , they are hard and not brittle. Metals are malleable and ductile.

Malleability is the property by which it can be pressed into different shapes easily without cracking. Ductility means they can be plastically deformed into thin wires without fracture.

Metals are shining and this property is called lustrous. Hence all the properties such malleability, ductility and luster are features of metals but they are not brittle. Hence option A is correct.

To find more about metals, refer the link below;

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Your question is incomplete. But your complete question probably was:

Which of the following is NOT a property of metals associated with metallic bonds?

A Brittleness

B Malleability

C Ductility

D Luster

Answer:

Asthenosphere

Explanation:

The asthenosphere is the hot, weak, inner part of the upper mantle. Although it is solid, it can flow like a thick, heavy liquid.

Answer:

A

add a coefficient 2 before Fe and a 3 before H2O

Answer:

Option A. Add a coefficient 2 before Fe and a 3 before H2O

Explanation:

Fe₂O₃ + 3H₂ —> Fe + H₂O

The above equation can be balance by as follow:

Fe₂O₃ + 3H₂ —> Fe + H₂O

There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 before Fe as shown below:

Fe₂O₃ + 3H₂ —> 2Fe + H₂O

There are 3 atoms of O on the left side and 1 atom on the right side. It can be balance by putting 3 before H₂O as shown below:

Fe₂O₃ + 3H₂ —> 2Fe + 3H₂O

Now the equation is balanced.

Thus, the student should add a coefficient 2 before Fe and a 3 before H2O

Answer:

63.499%

Explanation:

Answer:

There are 2.7× 1023atoms in 0.45 mol of Al.

Explanation:

Answer:

do not care

Explanation: