Which is an example of the electromagnetic force?
- A compass needle points north toward earths magnetic pole
- An iron nail rolls off a table and falls to the ground
- the moon pulls on the water in earths oceans, causing tides
- protons that make up a nitrogen atom stays together in the nucleus

Answer:

1. some thing that has matter is an apple, a person,a table. things that does 2.not Light.,Sound.,Heat.Energy.Gravity.Time.A Rainbow.Love.

3. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

4.A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. Absolute confirmation of a chemical change can only be validated by chemical analysis of the products!

5.Precipitate: In chemistry, a solid formed by a change in a solution, often due to a chemical reaction or change in temperature that decreases solubility of a solid. In meteorology a precipitate is liquid or solid water (rain, snow, etc.) falling from the sky.

6.n 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.

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Explanation:

Answer:

I guess number three (3) Is wrong

Answer: taking thisin advanced middle  school math doubt thats college

Explanation: has to be b or c, asked my teacher honestly everybody on here said b but 1 person said 3 which is partially incorrect but uh

Answer:

You answer is correct

Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.

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Answer:

3.3g

Explanation:

Given parameters:

Mass of HCl  = 13.5g

Unknown:  

 Mass of water produced  = ?

Solution:

The reaction equation is shown below;

         2HCl   +  CaCO₃  →  CaCl₂  +  CO₂  + H₂O

To solve this problem, let us find the number of moles of the given specie first then we can use that to find the mass of the unknown water.

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

           Molar mass of HCl  = 1 + 35.5  = 36.5g/mol

  Number of moles of HCl  = [tex]\frac{13.5}{36.5}[/tex]   = 0.37mol

From the balanced chemical reaction;

      2 mole of HCl will produce 1 mole of H₂O

     0.37mole of HCl will produce [tex]\frac{0.37}{2}[/tex]   = 0.19mole of H₂O

So to find the mass of H₂O;

   Mass  = Number of moles x molar mass

         Molar mass of H₂O  = 2(1) + 16  = 18g/mol

  Mass of H₂O  = 0.19 x 18  =3.3g

Answer:

[tex]\Delta G^0_{rxn}=16.81kJ[/tex]

Explanation:

Hello!

In this case, since the Gibbs free energy of any process is related with the enthalpy change, temperature and entropy change as shown below:

[tex]\Delta G^0=\Delta H^0-T\Delta S^0[/tex]

For a chemical reaction it is simply modified to:

[tex]\Delta G^0_{rxn}=\Delta H^0_{rxn}-T\Delta S^0_{rxn}[/tex]

Thus, since the enthalpy of reaction is given as -304.2 kJ and the entropy as -414.2 J/K (-0.4142 kJ/K), at 775 K the Gibbs free energy of reaction turns out:

[tex]\Delta G^0_{rxn}=-304kJ-775K*(-0.4142\frac{kJ}{K} )\\\\\Delta G^0_{rxn}=16.81kJ[/tex]

Whose result means this is a nonspontaneous reaction.

Best regards!

Answer:

Chemical

Explanation:

Answer:

The study of chemistry is about the learning of chemist arts

Answer:

Liquids, They are the only one that can change shape to fit the container

Answer:

option A  is correct.

Explanation:

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

Explanation:

Aluminium hydroxide is amphoteric. Because it reacts with both acids and bases. Like any conventional base, the OH radical in Al(OH)3 neutralizes H+ to make water and an aluminium salt. Al(OH)3 solid will also react with excess OH– to dissolve and form the complex ion [Al(OH)4]−.

Answer:

Answer: Aluminium hydroxide ,AI(OH)3,is found in nature as the mineral gribbsite (also know as hydrargillite) and its three much rarer poly morphs

Explanation:

yan lang po ang alam ko

Answer:

1.11g/cm³

It will sink

Explanation:

Given parameters:

Dimension of the kryptonite:

    W = 3cm

     L  = 6.0cm

     H = 4.0cm

Mass  = 80g

Unknown:

Density of the kryptonite = ?

Solution:

The density of a substance is its mass per unit volume;

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

 Now let us find the volume;

 Volume  = L x W x H  = 3 x 6 x 4 = 72cm³

So;

    Density  = [tex]\frac{80}{72}[/tex]  = 1.11g/cm³

The substance will not float in water because its density is greater than that of water. It will sink in water.

Answer:

I just did the assignment it's "decreases"

Explanation:

If you guys came from Ed-genuity (i'm writing it like that because apperantly that is a swear word?) That means the next questions are "As you move from left to right across the periodic table, electronegativity..." and "As you move from top to bottom within a group, the first ionization energy...".

for electronegativity, it's increases and for ionization energy it's decreases. Hope this helps!

Answer:

1. Decreases

2. Increases

3. Decreases

Answer:

[tex]833.72\ \text{torr}[/tex]

Explanation:

[tex]P_g[/tex] = Pressure of gas = [tex]106\ \text{mmHg}[/tex]

[tex]P_a[/tex] = Atmospheric pressure = 0.958 atm

Absolute pressure is given by

[tex]P=P_g+P_a[/tex]

[tex]\Rightarrow P=\dfrac{106}{760}+0.958[/tex]

[tex]\Rightarrow P=1.097\ \text{atm}=1.097\times 760=833.72\ \text{torr}[/tex]

The pressure of the gas in the tank is [tex]833.72\ \text{torr}[/tex]

Answer:

Unicellular organisms contain one cell and all of their functions are based on that one cell whereas multicellular organisms contain more than one cell and their functions are divided amongst different cells like nervous cells, cardiac muscle cells etc.

Explanation:

While multicellular creatures have numerous cells, unicellular organisms only have one.

A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.

Prokaryotic and eukaryotic organisms are the two broad categories into which all organisms fall.

Unicellular organisms only have one cell, whereas multicellular species have many. While multicellular creatures carry out various cell functions through a clearly defined set of cells, unicellular organisms combine all cellular functions into one cell.

Multicellular and unicellular organisms are comparable in that they exhibit nearly all of the life's processes and functions, including metabolism and reproduction.

They have RNA and DNA, which can show a variety of lifestyles vital to the majority of the ecosystem in which we currently live.

Thus, these are some similarities and differences between unicellular and multicellular organisms.

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Answer:

[tex]\Delta _rH=17.51\frac{kJ}{mol}[/tex]

Explanation:

Hello!

In this case, since the enthalpy change for any process is computed by subtracting the enthalpy of the final state and the enthalpy of the initial state, for the given phase change, we subtract the enthalpy of the liquid (final state) and the enthalpy of the solid (initial state) considering this a melting process:

[tex]\Delta _rH=-390.76\frac{kJ}{mol} -(-408.27\frac{kJ}{mol} )\\\\\Delta _rH=17.51\frac{kJ}{mol}[/tex]

Which makes sense because this process absorbs energy.

Best regards!

The enthalpy change for the sublimation of LiCl(s) → LiCl(l) is 17.51 kJ/mol.

The enthalpy change for the phase change is given by;

ΔH°fproducts - ΔH°freactants.

From the available information in the question;

ΔH°fLiCl(s)   = -408.27 kJ/mol

ΔH°fLiCl(l) = -390.76 kJ/mol

Hence;

ΔH°reaction = (-390.76 kJ/mol) - (-408.27 kJ/mol)

ΔH°reaction = 17.51 kJ/mol

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Answer:

C.

Explanation:

Answer:

C

Explanation:

Answer:

.

Explanation:

Answer:

b

Explanation:

causes onj the scale of 2 3 4 it equals s

Answer: So if you had 570 cm of ribbon, then 570%2F8.5=67.05 which means that about 67 students can do the experiment (round down to the nearest whole number).

Explanation: If you had 8.5 cm of ribbon, then only 8.5%2F8.5=1 student can do the experiment. If you had 17 cm of ribbon, then 17%2F8.5=2 students can do the experiment.

Answer:

Electronegativity increases as you move across the periodic table from left to right.

Explanation:

Answer:

increases

Explanation:

Answer:

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

Explanation:

the volume of the block is 4 x 2 x 4.5 and that equals 36. Divide the mass by the volume and you get [tex]\frac{18}{36}[/tex] which is equal to 2 g per cubic centimeters

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Answer:

Longer wavelengths

Explanation:

The type of wavelength in UV/V spectroscopy is absorbed by easily excited electrons will be longer wavelengths.

The distance a wave-particle travels after completing one oscillation would be its wavelength.

The electric charge of the electron, a subatomic particle, would be a negative elementary charge.

Between around 200 nm (only in near-ultraviolet ) and 800 nm, and absorption spectrometer operates (near infra-red). In that location, only a small fraction of the potential electron jumps can absorb light.

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Molar mass of MgCl₂ : 95 g/mol

An atomic mass unit ( amu or "u") is a relative atomic mass of 1/12 the mass of an atom of carbon-12.  

The molar mass(molecular mass-formula mass) of a compound is the sum of the relative atomic mass (Ar) of the constituent elements of the compound

Can be formulated :  

M AxBy = (x.Ar A + y. Ar B)  

Compound MgCl₂

[tex]\tt M=Ar~Mg+2.Ar~Cl\\\\M=24+2.35.5\\\\M=24+71\\\\M=95~g/mol[/tex]

Answer:

cuticle

Explanation:

Hope this help :)

Answer:

B(cuticle)

Explanation:

Answer:

Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.

Answer:

A. Metal mixture is impure

Answer:

Density = 1.56 g/mL

Explanation:

We have two sort of concentrations in here, so let's combine them.

% by mass means grams of solute in 100 g of solution

M means, moles of solute in 1L of solution.

We know that our solute is KOH (Molar mass = 56.1 g/mol)

We convert the moles of solute to grams:

56.1 g/mol . 13.9 moles = 779.79 g

Now, we know that 50 g of solute are in 100 g of solution

Then, 779.79 g of solute will be contained in (100 . 779.79)/50 = 1559.58 g of solution

Density = mass / volume

1559.58 g of solution / 1000 mL of solution = 1.56 g/mL