Question 4 (1 point)
How much energy is needed to melt 15.4 grams of water at 0 degrees Celsius? (AHrus-334 J/g)
b
21.7)
5.1)
5.1 kJ
21.7 kJ
с
d

Answer:

Explanation:

D. Se2−

Selenium is in Group 16 of the periodic table, and it typically has 6 valence electrons. To achieve a stable set of valence electrons, it will either try to gain two more electrons to form Se²⁻or lose six electrons to form Se⁶⁺. Therefore, the correct option is option D.

An ion is an atom or a molecule that has gained or lost one or more electrons, resulting in an unequal number of protons and electrons. When an atom gains electrons, it becomes negatively charged and is called an anion. Conversely, when an atom loses electrons, it becomes positively charged and is called a cation.

Ions play a crucial role in chemical reactions and the formation of chemical compounds, as they are attracted to one another based on their opposite charges. This process helps stabilize the electron configuration and achieve a more stable, lower-energy state.

Thus, the ideal selection is option D.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 9 × 3

We have the final answer as

Hope this helps you

Answer:

Relative atomic mass  = 24.32 amu.

Explanation:

Given data:

Relative atomic mass of Mg = ?

Abundance of Mg-24 = 79.0%

Abundance of Mg-25 = 10.0%

Abundance of Mg-26 = 11.0%

Solution:

Relative atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) +  (abundance of 3rd isotope × its atomic mass)  / 100

Relative atomic mass  = (79.0×24)+(10.0×25) +(11.0×26) /100

Relative atomic mass =  1896 + 250 + 286 / 100

Relative atomic mass  = 2432 / 100

Relative atomic mass  = 24.32 amu.

Answer:

Salt particles move about the water. Each particle is surrounded by water molecules.The water particles (molecules) keep the salt particles from rearranging themselves back into a salt crystal. Salt particles are carried throughout the solution surrounded by water particles.

As the water evaporates less and less water molecules are present to keep the salt particles apart. The salt therefore recrystalises and can be collected.

Explanation:

Hope this helped!

-B

Answer:

Potential Energy

Explanation:

By compressing the spring there is more potential energy.

Answer:

[tex]Fe_{2} O_{3}[/tex]

Explanation:

Answer:

a chemiacal

Explanation:

Initial volume of graduated cylinder = 30.0 mL

Final volume of graduated cylinder after adding rock = 75.0 mL

Volume of the rock = Final volume of graduated cylinder after adding rock - Initial volume of graduated cylinder

= (75.0 - 30.0) mL

= 45.0 mL

Mass of the rock = 55.0 g

[tex] \rm Density = \dfrac{Mass}{Volume} \\ \\ \rm = \dfrac{55}{45} \\ \\ \rm = 1.23 \: g/mL[/tex]

[tex] \therefore [/tex] Density of the rock = 1.23 g/mL

Answer:

1.Irreversible

2.Physical

3.

Answer:

Zinc, copper sulfate

Explanation:

The reactants are the ones on the left side

In the given reaction, it is clearly visible that Zinc and Copper (II) sulfate are the reactants in the equation below. Thus, the correct options are A and C.

Reactants may be defined as substances or compounds that undergo chemical reactions and have been altered during the course of an incident. Such compounds or substances most of the time are catalyzed by numerous catalysts in order to accomplish the conversion of reactancts substances faster.

The given reaction illustrates an example of a displacement reaction. During this reaction, when zinc is added to copper sulfate solution, zinc displaces copper and forms zinc sulfate solution. It will demonstrate a type of redox reaction.

This happens because on the basis of the reactivity series which determines that zinc is considered to be more reactive than copper.

Therefore, in the given reaction, it is clearly visible that Zinc and Copper (II) sulfate are the reactants in the equation below. Thus, the correct options are A and C.

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Answer:

Single-Replacement Reaction

General Formulas and Concepts:

Types of Reactions

Explanation:

Step 1: Define reaction

CaCl₂ + F₂ → CaF₂ + Cl₂

Step 2: Identify backplate

Single-Replacement Reactions: A + BC → AB + C

BC = CaCl₂

A = F₂

AB = CaF₂

C = Cl₂

Answer:

I answer this question I think I said the second one

Answer:

yep its the second one

Explanation:

Answer:

B

Explanation:

The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions.

Answer:

c. alcohol

it has no substance

Answer:

A

Explanation:

The number of molecules of Cl₂ that would be formed from the reaction mixture that produces the greatest amount of products is 4.

Molecular diagrams are the representations of the chemical reaction, with the help of molecular orbital theory. They show the chemical bonding and linear combination of the elements.

Now, here the reaction is

4HCl(g)+O₂(g)→2H₂O(g)+2Cl₂(g)

Diagram b has 8 molecules of HCl (limit reagent) and 3 molecules of O₂. This is the reaction that will produce the greatest amount of product.

Hence, b is taken for the number of chlorine.8 molecules of HCl need to combine with 2 molecules of oxygen to produce 4 molecules of Cl₂. The reaction's stoichiometry shows this to be the case.

Thus, there will be four, 4 molecules of chlorine that would be formed from the reaction.

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Answer:

The air in the atmosphere consists of nitrogen, oxygen, which is the life-sustaining substance for animals and humans, carbon dioxide, water vapour and small amounts of other elements (argon, neon, etc.). Higher in the atmosphere air also contains ozone, helium and hydrogen.

Explanation:

:))

Answer:

radiation and reflection

Explanation:

Energy is send from space to earth by radiation and reflection. The most predominant way in which heat is transferred from earth to space is by radiation.

Answer:

radiation and reflection

hope helps you

have a nice day

Answer:

Climates at different latitudes are similar to one another.

Explanation:

The choice that is not a proof of Wegener's concept of concept of continental drift is that climates at different latitudes ae similar to one another.

Answer:

Climates at different latitudes are similar to one another.

Answer:

Explain that as the water evaporates, water molecules go into the air. The water molecules that evaporate become a gas called water vapor. Only the water evaporates, leaving the sodium and chloride ions behind. The sodium and chloride ions attract each other and re- form salt crystals.

Hope this helps!! :D

The right options is a cation and an anion !

Answer:

Choice B, as time goes on the surface level rises and stuff buried underground gets further and further below surface level.

Explanation:

9.0122 g be Maybe, sorry i don't think so

In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.

The molar mass of each element can be found on the periodic table.

To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:

Therefore, the sample with 21.62 g of boron (B) contains the most atom

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Answer:

33.33 Watt

Explanation:

we know that P= W/t

W= work

t= time (in seconds)

so here

W= 100,000J

and t= 50 min= 50×60 sec= 3000 s

so P= 100,000/ 3000

=100/3 = 33.33Watt

mass of calcium oxide equals 89.23 g

molar mass of calcium oxide equals 56 G / Mole

the formula which is used as much of CaO equals molar mass of CaO

now put all of the Given values in this formula, we would get the moles of calcium oxide.

moles of CaO= 88.23g over 56g/mole which would get you 1.593 moles

Answer: The suffixes of the names of polyatomic ions have a pattern associated with them. ... For example, the sulfite ion has three oxygen atoms whereas the sulfate ion has four oxygen atoms.

Answer:

7... simalair: made of more than 2 things    DIffernt: elemants are made of atoms.

Explanation:

Answer: A.) The reactant that is used up first in a reaction

The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end. A limiting reagent is the reactant that is used up first in a reaction. Therefore, option A is correct.

A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.

The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced. Calculate how many moles of each reactant are present and contrast this ratio with the mole ratio of the reactants in the balanced chemical equation to get the limiting reactant.

The terms limiting reagent and limiting agent may also be used to describe the limiting reactant.

Thus, option A is correct.

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Answer

2,8,18,18,1

Explanation:

Given:

The overall average speed = 25 cm/s.

The overall average speed increased by 10%.

To find:

The new overall average speed.

Solution:

We have,

Overall average speed = 25 cm/s.

The overall average speed increased by 10%. So, the new average speed is

New overall average speed = Initial average speed + 10% of initial  overall average speed

[tex]\text{New overall average speed}=25+\dfrac{10}{100}\times 25[/tex]

[tex]\text{New overall average speed}=25+2.5[/tex]

[tex]\text{New overall average speed}=27.5[/tex]

Therefore, the new overall average speed is 27.5 cm/s.