Can someone please show me how to solve this?

Answer:

1. plasma; 2. qualitative; 3. matter;

Explanation:

PLASMA is a gaseous state of matter that contains appreciable numbers of electrically charged particles.

Diamond is harder than graphite. This is a QUALITATIVE observation.

Chemistry is defined as the study of MATTER.

Plasma  is a gaseous state of matter that contains appreciable numbers of electrically charged particles.Diamond is harder than graphite. This is a qualitative observation.Chemistry is defined as the study of matter.

Matter in chemistry, is defined as any kind of substance that has mass and occupies space that means it has volume .Matter is composed up of atoms which may or not be of same type.

Atoms are further made up of sub atomic particles which are the protons ,neutrons and the electrons .The matter can exist in various states such as solids, liquids and gases depending on the conditions of temperature and pressure.

The states of matter are inter convertible into each other by changing the parameters of temperature and pressure.Matter is always conserved  according to law of conservation of matter.

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Answer:

When we move from the bottom to the top of the periodic table:

Both electronegativity and ionisation energy increases.

Explanation:

The ionization energy I is the energy needed to start an electron to a gaseous atom, isolated and in a fundamental state. The electrons are attracted to the nucleus, so it is necessary to provide energy to start them. You should keep in mind that the electrons of the last layer are always lost, because they are the weakest attracted to the nucleus.

In a group, the ionization energy increases upwards because when passing from one element to the bottom, it contains one more layer of electrons. Therefore, the valence layer electrons, being further away from the nucleus, will be less attracted to it and it will cost less energy to pluck them.

On the other hand, electonegativity is defined as the ability of an element to attract electrons that link it to another element.

When descending within the same group, the atomic radius increases and the ionization energy decreases, indicating that the electrons are less attracted to the nucleus and therefore the electronegativity decreases from top to bottom.

A person having trouble breathing could be a sign of

d. All of the above(alcohol overdose, depressant overdose, or stimulant overdose)

Most instances of windedness are because of heart or lung conditions. These organs are engaged with shipping oxygen to your tissues and removing carbon dioxide, and issues with both of these cycles influence your relaxation.

At a party, if a person feels trouble breathing then it can be due to an alcohol overdose, depressant overdose, or stimulant overdose.

Thus, option D is correct.

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Answer:

It's an homogeneous Mixture

hehe

Answer:

An acid dissociation constant, K a, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction ↽ − − ⇀ − + + known as dissociation in the context of acid–base reactions.

Explanation:

Answer:

2FeBr3 + 3Na2S ➡️ Fe2S3 + 6NaBr

Answer:

D

Explanation:  government

business

citizens

The correct answer is option d all of the above.

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Answer:

So the empirical formula is C14H18N2O5

Explanation:

C = 57.2% = 12g/mol

H = 6.1% = 1g/mol

N = 9.5% = 14g/mol

O = 27.2% = 16g/mol

Empirical Formula for compound hmm

Assume

C = 57.2g

H = 6.1g

N = 9.5g

O = 27.2g

So we have

C = 57.2g/12g =  4.76  moles

H = 6.1g/1g      =  6.10   moles

N = 9.5g/14g   =  0.68  moles

O = 27.2g/16g =  1.70   moles

Divide each mole value by the smallest number of moles calculated.  Round to the nearest whole number.

C =  4.76  moles / 0.68 moles = 7

H = 6.10   moles / 0.68 moles = 9

N = 0.68  moles / 0.68 moles = 1

O = 1.70   moles / 0.68 moles = 2.5

Ok so we now have the ratios but for O it's 2.5, have to be whole numbers so we will need to double all the numbers.

C = 14

H = 18

N =  2

O =  5

So the empirical formula is C14H18N2O5

Answer:

the air would be much cleaner and better for us to breath.

Explanation:

Answer:

The two objects have the same electric charge.

Explanation:

Electrically charged objects repel if they are both of the same charge, ie plus plus or minus minus.

The statement, that describes two electrically charged objects repel one another is "the two objects have the same electric charge."

The feature of subatomic particles that causes them to experience a force when put in an electric and magnetic field is known as electric charge.

When one or more items are electrically charged, electrostatic interactions are widespread. Two items with opposing charges will attract each other.

Unlike the attractive force between two items with opposite charges, two objects with like charges repel each other. In other words, a positively charged object will repel another positively charged object. This repelling force will separate the two items.

Hence the correct answer is the two objects have the same electric charge.

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Answer:

Water H2O

Explanation:

A solvent is defined as being able to dissolve other substances, the fertilizer is being dissolved in the water prior to watering the plants, therefore the water is the solvent in this case.

Answer:

D. 15g

Explanation:

The law of conservation of mass states that, in a chemical reaction, mass can neither be created nor destroyed. This means that the amount of matter in the elements of the reactants must be equal to the amount in the resulting products.

In this question, 25 grams of a reactant AB, was broken down in a reaction to produce 10 grams of products A and X grams of product B. According to the law of conservation of mass, the mass of the reactant must be equal to the total mass of the products. This means that 25 grams must also be the total mass of both products in this reaction. Hence, if product A is 10 grams, product B will be 25 grams - 10 grams = 15 grams.

Therefore, product B must be 15 grams in order to form a total of 25 grams when added to the mass of product A. This will equate the mass of the reactant AB and fulfill the law of conservation of mass.

Answer:

a ,e

Explanation:

math

They all have the same mass number

Answer:

D. Na2CO3

Explanation:

I'm just guessing tbh

Answer: 149

Explanation:

Using the ideal gas equation; PV = nRT

P= Pressure = 0.910 atm,     T= Temperature = ?

V= Volume = 4.0L                  R = Gas constant = 0.08206 L.atm/mol/K

n = number of moles = 0.297

Making 'T' the subject of the formular, we have;

T = P V/ n R   =  0.910  x 4  /  0.297 x 0.08206

                       =  149

Answer:

346.5 cm³ or 347cm³

Explanation:

v1/T1 = v2/T2

417/278 = v2/231

v2 = 346.5 cm³

Answer:

The new volume of the balloon is [tex]346.5\ cm^3[/tex].

Explanation:

Initial volume of a balloon is 417 cm³

The temperature decreases from 278 K to 231 K.

It is required to find the new volume of the balloon if the pressure is constant pressure. At constant pressure, volume is directly proportional to the temperature. So,

[tex]V\propto T[/tex]

i.e.

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

V₂ is final volume.

[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{417\times 231}{278}\\\\V_2=346.5\ cm^3[/tex]

So, the new volume of the balloon is [tex]346.5\ cm^3[/tex].

Answer:

Both contain a hydroxyl group on the second carbon.

Neither contain a hydroxyl group on an end chain carbon.

Explanation:

2,2-butanediol Formula: C4H10O2

2,3,4-pentanetriol Formula: C5H12O3

Both contain a hydroxyl group on the second carbon.

Neither contain a hydroxyl group on an end chain carbon.

Answer: The molarity of [tex]Br^-[/tex] anions in the chemist's solution is 0.0084 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in ml

moles of [tex]FeBr_3[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{0.0411g}{295.6g/mol}=0.00014mol[/tex]

Now put all the given values in the formula of molality, we get

[tex]Molarity=\frac{0.00014\times 1000}{50}=0.0028[/tex]

As 1 mole of [tex]FeBr_3[/tex] gives = 3 moles of [tex]Br^-[/tex]

0.0028 moles of [tex]FeBr_3[/tex] gives = [tex]\frac{3}{1}\times 0.0028=0.0084 moles[/tex] of [tex]Br^-[/tex]

Thus the molarity of [tex]Br^-[/tex] anions in the chemist's solution is 0.0084 M

Answer:

Question 1

Which type of bond describes the coming  together and sharing of two unpaired outer  electrons, one from each atom?

A. Single covalent bond.

Definition of single covalent bond:

A single covalent bond is when only one pair of electrons is shared between atoms.

Question 2

What is the name of this molecule (CO2) that  forms by burning of fuels and is one of the  gases that contributes to global  warming/climate change?

C. Carbon dioxide.

Answer:

It is calcualted based ion the  yield from the limiting reactant

Explanation:

Answer:

CrO

Explanation:

0.765g Cr

0.235g O

O = 16g/mol

Cr = 52g/mol

O     2-

Cr  2+, 3+, 6+

0.765 + 0.235 = 1

so 76.5% Cr

23.5% O

76.5/52 = 1.47/1.47 = 1

23.5/16 = 1.47/1.47 = 1

CrO

Answer:

Units used to measure atomic radius:

Angstroms (Å): This the most common unit used. Equivalent to 1.0 x 10-10 meters.

Nanometer (nm): Equivalent to 1.0 x 10-9 meters.

Picometer (pm): Equivalent to 1.0 x 10-12 meters.

Answer:

read below

Explanation:

When the zebra eats grass, it gets energy from the sun that has been stored in the grass. Similarly, the lion obtains energy stored in the zebra. The zebra and lion both obtain the sun's energy indirectly from the energy that the grass obtained through photosynthesis.

Answer/Explanation:

It gets energy from the sun that was inside of the grass.

It happens like this:

Sun gives energy to grass, grass gives energy to zebra.

Sun ---> Grass ---> Zebra

Answer:

b

Explanation:

electrons lie in the orbits of the atom. they are negatively charged and they are very small in size. they have very less mass than proton. ele tron has 1/1840 mass of proton.

Answer:

Individual grain of rice will sink.

Explanation:

Given:

Rice bulk density = 0.9 g/ml,

Individual grain of rice density = 1.1 g/ml

Water density = 1.0 g/ml

Find:

What happens with a cup of rice when poured into water =?

Explanation:

Each piece of grains of rice will sink into the water because individual grains of rice has a higher density than water.

Answer:

Explanation:

Skeleton equations are also known as unbalanced equations.

Eg I react Oxygen, Hydrogen and Chlorine and I get Water and Chlorine Gas

H2 + Cl2 = HCl

Left Side

H = 2

Cl = 2

Right Side

H = 1

Cl = 1

As you can see it's not balanced is skeleton equation.

Answer:

Solid Zn

Explanation:

I took the test :-)

In the diagram solid Zn is negatively charged.

Zinc is known as a element that acts as a negative electrode based on the fact that it has more negative potential and acts as the anode.

Based on the fact that zinc is a metal, it is known to often forms metallic compounds with other kinds of metals and based on the fact that it also has an ion charge of +2, the zinc ions are referred to as a strong reducing agents and thus do form ionic bonds.

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Answer:

C: 91 kJ/mol; no

Explanation:

Just took the quiz! :)

The ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.

Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity that is used to measure the maximum amount of work done in a thermodynamic system when the temperature and pressure are kept constant.

The Gibbs free energy of the system is a state function because it is defined in terms of thermodynamic properties that are state functions.

The change in the Gibbs free energy of the system that occurs during a reaction is therefore equal to the change in the enthalpy of the system minus the change in the product of the temperature times the entropy of the system.

                                             ΔG = ΔH - TΔS

Given,

ΔH = 176kJ/mol

ΔS = 0.285kJ/mol K

T = 25⁰C = 273 + 25 = 298K

ΔG = ΔH - TΔS

ΔG = 176000 - 298 × 285

= 91070 = 91 kJ/mol

Since ΔG is positive, the reaction is not spontaneous in the forward direction.

Therefore, the ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.

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Answer:

Marijuana

Opiates

Opioids

Explanation: