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Answer:

Balance the equation

Fe3O4 + 4H2---> 3Fe +4H2O

Molar mass H2=(2*1)=2g/mol

Mass of H2=54.29grams

mole of H2= 54.29/2=27.15mol

4 mol of H2 = 1 mol Fe3O4

27.15mol of H2= 6.79mol of Fe3O4

Moles of Fe3O4 =6.79mol

Molar mass of Fe3O4= (56×3)+(16×4)

=168+64=232g/mol

Grams of Fe3O4 required to react with 54.29 grams of H2 is 232g/mol× 6.79mol

=1575.28g

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:

2FeBr3 + 3Na2S ➡️ Fe2S3 + 6NaBr

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: The orange can shall be your answer.

Answer:

D. Na2CO3

Explanation:

I'm just guessing tbh

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:

[tex]\large \boxed{\text{528.7 g} }[/tex]

Explanation:

It often helps to write the heat as if it were a reactant or a product in the thermochemical equation.

Then you can consider it to be 11018 "moles" of "kJ"  

We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.

M_r:                      32.00

              2C₈H₁₈ + 25O₂ ⟶ 16CO₂ + 8H₂O + 11 018 kJ

n/mol:                                                                  7280

1. Moles of O₂

The molar ratio is 25 mol O₂:11 018 kJ

[tex]\text{Moles of O}_{2} = \text{7280 kJ} \times \dfrac{\text{25 mol O}_{2}}{\text{11 018 kJ}} = \text{16.52 mol O}_{2}[/tex]

2. Mass of O₂

[tex]\text{Mass of C$_{8}$H}_{18} = \text{16.52 mol O}_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \textbf{528.6 g O}_{2}\\\text{The reaction requires $\large \boxed{\textbf{528.67 g O}_{2}}$}[/tex]

Answer:

It's an homogeneous Mixture

hehe

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:

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:

D. Weight

Explanation:

Answer:

Weight

Explanation:

Answer via Educere/ Founder's Education

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:

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:

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:

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:

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.

Answer:

X = 4

Explanation:

Start 2800

End 175

175 = 2800x(0.5)^X

175/2800 = 0.5^X

0.0625 = 0.5^X

log(0.5 x) = log(0.0625)

x · log(0.5) = log(0.0625)

-0.301x = -1.204

x = -1.204/-0.301

x = 4

Answer: a)  The concentration after 8.8min is 0.17 M

b) Time taken for the concentration of cyclopropane to decrease from 0.25M to 0.15M is 687 seconds.

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) concentration after 8.8 min:

[tex]8.8\times 60s=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{a-x}[/tex]

[tex]\log\frac{0.25}{a-x}=0.15[/tex]

[tex]\frac{0.25}{a-x}=1.41[/tex]

[tex](a-x)=0.17M[/tex]

b) for concentration to decrease from 0.25M to 0.15M

[tex]t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{0.15}\\\\t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\times 0.20[/tex]

[tex]t=687s[/tex]

Moles: 1

Weight, g : 192.3900

Answer:

Moles: 1

Weight, g : 192.3900

Explanation:

Answer:

From left to right

Neutral

Acid

Base

Explanation:

So using HSAB theory hard and soft (Lewis) acids and bases.

OH - Is a Hard Base

H+ Strong Acid

Answer:

CHEMISTRY GLOSSARY

Amplitude is the displacement of a wave from zero. The maximum amplitude for a wave is the height of a peak or the depth of a trough, relative to the zero displacement line

Answer: Definitely the answer is C. They both last for the same number of days.

Explanation: This requires the moon to complete a bit more than one orbit to be between the earth and the sun again. The period from new moon to full moon is one half a synodic month of 29.530/2 which is 14.765 days.

Answer:

Explanation:

write down the formulas, use the expressions and formulas to convert

Answer:

c) An element is made up of all the same type of atom

Explanation:

Atoms are the smallest unit of an element that consists of protons, electrons and neutrons in its structure. An element is the smallest part of a chemical substance that cannot be disintegrated i.e. it cannot be broken down further.

Atoms and elements are different in many ways but they are connected in the sense that an element contains only one type of atoms. For example, aluminum element is made up of only aluminum atoms. Different atoms form a molecule but same atoms form an element.

The difference of the element and iron should be option c) An element is made up of all the same type of atom.

The atom represents the smallest unit that comprises of protons, electrons, etc.

While on the other hand, the element represents the small part of the chemical substance that should not be disintegrated. Also, it cannot be split. They both should be interlinked.

Therefore, the option c is correct.

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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:

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:

Aluminum ion

Explanation:

I used Google tbh but it has a higher charge then a regular Aluminum atom