Chemistry High School

help pls its just one and i am done i dont get it

Answers

Answer 1

It’s the first option

Related Questions

The heat capacity of an object depends in part on its__

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Answer:

It depends on its mass and its chemical composition. Give me Brainiliest

An electrophoretic separation of lactate dehydrogenase isoenzyme that demonstrates elevation in LD-1 greater than LD-2 could be indicative of:

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An electrophoretic separation of lactate dehydrogenase isoenzyme that demonstrates elevation in LD-1 greater than LD-2 could be indicative of Hemolysis.

What is Hemolysis?

Hemolysis is a process (generally natural process) associated with the elimination of red blood cells.

Hemolysis can be defined as the removal of erythrocytes due to internal or external environmental factors.

Hemolysis can be discovered by analyzing (or counting) the number of certain proteins in plasma.

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Hi!! Please help in any way you can, I’ll give all of the points I have for it ^^
(Showing work is sadly required + needs to include units)

Answers

The reactions involved are synthesis, combustion and single replacement reactions and the masses of products formed are dependent on the mole ratio.

What are limiting reactants?

Limiting reactants are reactants are reactants that are used in a chemical reaction.

The equation for the production of water is given below:

[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]

The reaction is a synthesis reaction and the mole ratio of hydrogen to oxygen is 2 : 1.

Moles of 250 g of Hydrogen = 250/2 = 125 moles

Moles of water produced = 125 moles

Mass of water = 125 × 18 = 2250 g

Moles of oxygen in 250 g = 250/32 = 7.81 moles

Moles of water produced = 7.81 × 2 = 15.62

Mass of water produced = 15.62 × 18 = 281.16 g

Since moles of oxygen use is less than the mole ratio of reaction, oxygen is the limiting reactant.

2. The reaction of propane and oxygen is a combustion reaction and is given below:

[tex]C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O[/tex]

1 mole of propane produces 4 moles of water

44 g of propane produces 72 g of water

Mass of propane required to produce 1000 g of water = 1000 × 44/ 72 = 611.1 g of propane

3. The reaction of zinc and hydrochloride acid is a single replacement reaction and the equation is given below:

[tex]Zn + 2HCl \rightarrow ZnCl_2 + H_2[/tex]

1 mole of Zn and 2 moles of HCl are required to produce 1 mole of hydrogen gas

Molar mass of Zn = 65 g

Molar mass of HCl = 36.5

Molar mass of hydrogen = 2.0 g

150 g of Hydrogen gas = 150/2 = 75 moles of hydrogen

Mass of 75 moles of Zn = 75 × 65 = 4875 g

mass of 75 × 2 moles if HCl = 150 × 36.5 =5475 g

Therefore, 4875 g of Zn and 5475 g of HCl are required to produce 150 g of Hydrogen gas.

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Which of the following increases the rate at which a solute is dissolved by
a solvent?
a.
Keeping the solution completely still.
b. Placing the solution in an ice bath as it forms.
c. Heating the solvent to its boiling point before adding the solute.
d. Leaving the solute in chunks rather than breaking it up before dissolving it. you
about the
experiment (restate your results), and what you learned from completing the experiment.

Answers

Answer: C

Explanation:

Increasing the temperature increases the rate of dissolving.

Which ion is formed when an atom of fluorine (f) gains one electron? f–1 f–2 f 1 f 2

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Answer:

If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.

Explanation:

hope this helps

pls mark brainliest

(Word equation) which of the four metals - aluminium, copper, lead and silver is the most reactive

Answers

Answer:

Aluminum

Explanation:

I just used the Reactivity Series chart :)

What is the empirical formula of a compound containing 65.5 grams carbon, 5.5 grams hydrogen, and 29.0 grams oxygen?

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Answer: The empirical formula is C₃H₃O.

Explanation: Assume we have 100 g of the compound. Then we have 65.65.5 g of C, 5.5 g of H, and 29.0 g of O.

Answer:

C₃H₃O

Explanation:

I took the test

NEED HELP PLEASE HURRY

Which of the following are decomposition reactions? Select all that apply.

H2CO3 -> CO2 + H2O

CaCO3 -> CaO + CO2

2H2O -> 2H2 + O2

3Mg + N2 -> Mg3N2

2NaCl -> 2Na + Cl2

Answers

Answer:

I believe it would be the last 2

Explanation:

the 4th one is magnesium and something else but that's with decomposition and so is the last one. the first three has water and oxygen and stuff that doesn't rly do decomposition

Are two atoms of the same element identical?

Answers

Answer:

No It is not

Two of the same atoms are most likely not identical

A 33.6 mL solution of KCl has a mass of 27.29 g. After evaporating to dryness, the dry salt residues has a mass of 6.31 g. Calculate the following: a. %m/m b. Molarity (M)

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For the molarity and the percentage of the mass of kcl are mathematically given as

%m/m = 23.1%, molarity = 3.38M

What is the molarity?

Generally, the equation for the percentage of the mass of kcl is mathematically given as

(mass of kcl/mass of solution)x 100

therefore

%m/m = (6.31/27.29)x100

%m/m = 23.1%

The molarity

(no of mol/ vol of sol)

molarity = 0.0846mol/0.0250 L

molarity = 3.38M

In conclusion, the molarity is given as

molarity = 3.38M

Answers

What is the difference between natural and artificial radioactivity?

Natural radioactivity comes from elements in nature. Artificial radioactivity comes from elements created in nuclear reactors and accelerators.

Answer:

natural is made from grass and artificial is made from toxic gas

Explanation:

yes

Giving brainliest, please HELP!

Answers

Answer:

Third choice

Explanation:

From the graph.....more heat is required to change from Liquid to a gas than is required to change from a solid to a liquid ( see how the flat line portion is longer?)

how many moles of Al are produced from a reaction using 82 g of Ca?

Answers

Answer:

how many moles of Al are produced from a reaction using 82 g of Ca?

Explanation:

How many moles of Fe2O3 will react with 99.0 g of Al? 1.83. 2. Ammonium nitrate decomposes to yield nitrogen gas, water, and oxygen gas in the following ...

Who is credited with arranging the periodic table?.

Answers

Answer

Dmitri Mendeleev Explanation:The modern periodic tables is credited primarily to the russian chemist Dmitri Mendeleev. Mendeleev's table is based on the periodic law, which states that when elements are arranged in order of increasing mass, their properties recur periodically.

Ge (g) + 2Cl2 (g) <-> GeCl4 (g)
The value of the equilibrium constant for the reaction represented above is 1 x 10^10. What is the value of the equilibrium constant for the following reaction?
2GeCl4(g) = 2Ge(g) + 4Cl2 (g)

Answers

The equilibrium constant gives us an idea of the extent of reaction. For the reaction; 2GeCl4(g) = 2Ge(g) + 4Cl2 (g), the equilibrium constant is 1 * 10^-20.

What is equilibrium constant?

The equilibrium constant gives us an idea of the extent of the conversion of reactants to products in a reaction.

In this case, we know that 2GeCl4(g) = 2Ge(g) + 4Cl2 (g) is the reverse of Ge (g) + 2Cl2 (g) <-> GeCl4 (g) hence we only need to invert the value of the equilibrium constant and raise it to power 2 to have 1 * 10^-20.

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The freezing point of pure benzene (C₆H₆) is 5. 49 °C. The freezing point of a solution made using toluene (C₇H₈) in benzene is determined to be -13. 0 °C. What is the molality of the toluene? (Kf benzene = 5. 12 °C/m)

Answers

The molality of the toluene is 1.46 mol/kg.

What is molality?

The molality of a solution is its molal concentration. Molal concentration is denoted by m. It is the mol of solute dissolves in 1 Kg solvent.

The depression at freezing point is directly proportional to the molality of the solution. The equation we use for this type of problem is:

ΔT=iKm [tex]f_m[/tex]

Where, ΔT [tex]f_m[/tex] is depression at freezing point, i is Van't hoff factor, m is molality and [tex]K_f[/tex] is the freezing point depression constant.

Toluene is a non-electrolyte and so the value of i for this is 1.

Depression at a freezing point is given as -13.[tex]0^0[/tex] and the [tex]K_f[/tex] is given as 5.12. So, we could calculate the molality of the solution using the equation written above.

Let's plug in the values in the equation:

ΔT=iKm[tex]f_m[/tex]

-7.51 =1 x5. 12 xm

m = [tex]\frac{7.51}{5. 12}[/tex]

m = 1.46 m

It means the molality of the solution is 1.46 mol/kg.

Hence, the molality of the solution is 1.46 mol/kg.

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One of the properties that makes copper, Cu, useful for household wiring is its ability to conduct electricity. Which other element is most likely to conduct electricity?

A. Radon, Rn
B. Nitrogen, N
C. Bromine, Br
D. Gold, Au

Answers

Answer:D) Gold, Au

Explanation:

Metals are conductive because of their free electrons. Gold is highly conductive.

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number. Therefore the correct option is option D

What are metals?

Metals are those elements which is hard, conduct electricity, ductile, lustrous and malleable. Since metals have free electrons that's why they can conduct electricity

A. Radon, Rn is an radioactive element so it is not metal so it can not conduct electricity

B. Nitrogen, N is an non metals hence it can not conduct electricity

C. Bromine, Br is also non metals so it can not conduct electricity

D. Gold, Au is a metals hence it can conduct electricity

Thus conducting electricity well is the properties of Gold is used in the household wiring. Therefore the correct option is option D

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compare and contrast then 4 types of friction?

Answers

Answer:

There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Static friction is strongest, followed by sliding

Explanation:

hope i help!.

Which is composed of aromatic hydrocarbons?

Answers

An example of The substance which is composed of aromatic hydrocarbins is : Pain reliever.

Aromatic hydrocarbons

Aromatic hydrocarbons are hydrocarbons in nature are composed of 6 rings of carbn atoms ( fused benzene rings ) certain compounds like petroluem contain aromatic hydrocarbons in nature. Certain medical drugs administered are composed of aromatic hydrocarbins an example of such drugs are pain relievers.

Hence we can conclude that the substance which is composed of aromatic hydrocarbons is pain reiever.

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what is the numbe of atoms in oxygen?

Answers

Answer:

Two atoms (O2)

Explanation:

Atmospheric oxygen molecule has 2 atoms, which can be easily seen from the oxygen symbol - O2. Here, the molecule has two atoms of oxygen.

Which subshell holds the valence electrons of barium?.

Answers

Answer:

Explanation:

Barium is in group 2 of the s block and is in period 6.

Barium belongs to the s block's period 6 and group 2. Barium is an alkaline earth metal with two valence electrons and a (+2) oxidation state found in Periodic Table Group 2.

How are the valence electrons located?Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six valence electrons, two of which are in the 2s subshell and four of which are in the 2p subshell. For neutral atoms, the number of valence electrons is the same as the number of the atom's main group. The column of a periodic table element can be used to determine its main group number. Carbon, for example, belongs to group 4 and has four valence electrons, which are the outermost (valence) shell electrons of an atom that can be shared or transferred to another element.

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Help I Will Mark Brainlist !! (ATTACHED IMAGE BELOW) Which of the diagrams below would be the FASTEST? _____ Why? Which of the diagrams below would be the SLOWEST? ____ Why?

Answers

Answer:

Fastest C. Reaction time is faster

Slowest A. Reaction time is slower and it takes longer to finish

Explanation:

A video-disc player that is not playing still uses 6.0 W of power. What is the
current into the video-disc player if it is plugged into a standard 120-V outlet?

Answers

Answer: 0.05 A

Explanation:

Hope this helps!

A video-disc player that is not playing still uses 6.0 W of power. The current is 0.05 A.

What is Power?

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Power is related to other factors; for instance, the power required to move a ground vehicle is equal to the product of the vehicle's velocity, traction force on its wheels, and aerodynamic drag.

A motor's output power is calculated by multiplying its torque output by the angular velocity of its output shaft. Similar to how the power expended in an electrical component of a circuit is the result of the current.

Therefore, A video-disc player that is not playing still uses 6.0 W of power. The current is 0.05 A.

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in an ion, the number of electrons is _____ to the number of protons

Answers

Answer:

more/less depending on if it lost or gained electrons during the ionic bond process

what is the freezing point in c of a 1.56m aqueous solution of cacl2? round to 3 decimal places.

Answers

Supposing complete ionization:
CaCl2 → Ca{2+} + 2 Cl{-} [three ions total]

(1.56 m CaCl2) x (3 mol ions / 1 mol CaCl2) = 4.68 m ions

(1.86 °C/m) x (4.68 m) = 8.70 °C change

0°C - 8.70°C = - 8.70°C

Harry uses a sling psychrometer to measure relative humidity near his school. The dry bulb temperature reads 58°F, and the wet bulb reads 45°F. At the same time, his cousin Roberta uses her sling psychrometer to measure the relative humidity near her house. The dry bulb temperature reads 58°F, and the wet bulb reads 50°F. What can you conclude from the values?
A.
The relative humidity is higher at Harry’s school than at Roberta’s house.
B.
The relative humidity is higher at Roberta’s house than at Harry’s school.
C.
The relative humidity is the same at Harry’s school and Roberta’s house.
D.
The relative humidity is 45% at Harry’s school and 50% at Roberta’s house.

Answers

Answer:

A.The relative humidity is higher at Harry’s school than at Roberta’s house.

Explanation:

Check using the Relative Humidity Table

Answer:

Option B) The relative humidity is higher at Roberta’s house than at Harry’s school.

Explanation:

got 100% on test

A sample of gas has an initial volume of 3.62 L at a pressure of 0.987 atm. If the volume of the gas decreases to 2.50 L, what will the pressure be

Answers

Answer: 1.43 atm

Explanation:

Given that [OH-] = 5.46x10^-9M
find the [H3O+] and state whether the solution is acidic or not and why?

Answers

pOH=-log[OH-]pOH=-log[5.46×10^{-9}]pOH=-log5.46-log10^-9pOH=-0.74+9pOH=8.26

pH:-

14-pOH14-8.265.74

It's acidic as pH<7

Now

-log[H+]=5.74log[H+]=-5.74H+=10^{-5.74}H+=1.81×10^-6M

H3C•
O=(
c
•CH3 can interact with
other like molecules through
dispersion
forces, dipole-
only dispersion
only dispersion
forces and
dipole and
forces
dipole-dipole
hydrogen bonds
Please help me

Answers

Answer:

Explanation:

H3C•O=(c•CH3 can interact with other like molecules through only only dispersion forces and dipole dipole forces. option B is correct.

What are dipole dipole forces?

The force of dipole dipole creates because of the presence of polar compounds and they are responsible for the polarization too and dispersion forces are weak molecular forces of interaction.

H3C•O=(c•CH3 is known as acetone and due to the presence of oxygen they form one polar bond due to the presence of lone pair on the oxygen atom and oxygen is the electronegative element too.

Acetone will form dispersion force as carbon and hydrogen are of similar electronegativities so they are bounded with dispersion force and not very polar.

Therefore, H3C•O=(c•CH3 can interact with other like molecules through only only dispersion forces and dipole dipole forces. option B is correct.

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Please help, I’ll mark your answer as brainliest

Answers

Answer:

5.16 gm of SO3 formed with 2 g of S

Explanation:

Mole weight of S in the equation = 2 * 32 = 62 gm

Mole weight os O2 in the equation 6 * 16 =96 gm

From the BALANCED equation the grams of S to O2 is

62 to 96 so 2 g of S will need approx 3 gm of O2

this shows that S is the limiting reactant------>

there will be O left over (approx 1 gram)

SO3 mole weight produced from the equation is 2 (32)(3*16) = 160 gm

62 gm of S produces 160 gm of SO3

62/160 = 2 / x x = 5.16 gm of SO3 are formed

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