chemistry question please help

Chemistry Question Please Help

Answers

Answer 1

Answer:

AR(18)  

Explanation:

Try that it should work

                                                                                                                                         *(


Related Questions

Calculate mass of an object if its density is 22.6 g/cm3 and it occupies volume of 5 cm3.

plz answer quickly if you know the answer... i will mark you brainliest! :)

Answers

Answer:

okay so I'm confused for the 5 cm3 but all you have to do is multiply those 2 numbers

Answer:

it is 113g

Explanation:

the formula you have to use here is mass=density*volume

sooo I multiplied it for u and gave the answer

A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of sun and water. She checks the growth of the corn over the course of five months.

Q9) What is the independent variable in this experiment? Why is this variable independent?


Q10) What is the dependent variable in this experiment? Why is this a dependent variable?

Q11) What variables are controlled in this experiment? Why are/is these/this variable control variable(s)?

Answers

Answer:

Q9. The independent variable in this experiment is the fertilizer. It is independent because she manipulating the variable to compare the growth.

Q10. The dependent variable in this experiment is the amount of growth of the corn. It is this because the growth depends on what the scientist did on the corn.

Q11. The variable controlled in this experiment is the amount of sun and water. These two variables never change so this is why it is the control.

Explanation:

Answer:

Explanation:

independent - 5 months dependent - sun controlled - water and the fertilizer

Electrons in the outermost shell of an atom that are available to bond with the electrons of other atoms are
Question 11 options:

A)

cations.

B)

free electrons.

C)

valence electrons.

D)

anions.
Question 12 (5 points)
Main group elements have valence electrons in which suborbitals?
Question 12 options:

A)

d and f

B)

s and p

C)

p and f

D)

s and d
Question 13 (5 points)
Molecules have
Question 13 options:

A)

only kinetic energy.

B)

only potential energy.

C)

both potential and kinetic energy.

D)

neither kinetic nor potential energy.
Question 14 (5 points)
The majority of elements are
Question 14 options:

A)

metalloids.

B)

nonmetals.

C)

metals.

D)

inert.
Question 15 (5 points)
A student found the mass of an object to be 26.5 g. To find the volume, the student submerged the object in a graduated cylinder of water. Submerging the object in the water in the graduated cylinder increased the water level by 24.1 mL. The density of the object is
Question 15 options:

A)

1.0906 g/mL.

B)

0.909 g/mL.

C)

1.10 g/mL.

D)

1.1 g/mL.

Answers

Answer:

c

Explanation:

definitely

Answer: 11; C

Explanation:

valance electrons

Freezing point
Where would you place this property in the Venn diagram?

Answers

For the Venn diagram, freezing water should be in the physical category (A)
I would pick A :) :)

A balloon containing methane gas has a volume of 1.03 L at 99.0 °C . What volume will the balloon occupy at 198 °C ?

Answers

Answer:

The balloon will occupy a volume of 1.32L.

Explanation:

Given the following data;

Original Volume, V1 = 1.03L

Original Temperature, T1 = 99°C

New Temperature, T2 = 198°C

To find new volume V2, we would use Charles' law.

Charles states that when the pressure of an ideal gas is kept constant, the volume of the gas is directly proportional to the absolute temperature of the gas.

Mathematically, Charles is given by;

[tex] VT = K[/tex]

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Converting T1, from Celsius to Kelvin = 273 + 99 = 372K

Converting, T2, from Celsius to Kelvin = 273 + 198 = 471K

[tex] \frac{V1}{T1} = \frac{V2}{T2}[/tex]

Making V2 as the subject formula, we have;

[tex] V_{2}= \frac{V1}{T1} * T_{2}[/tex]

[tex] V_{2}= \frac{1.03}{372} * 471[/tex]

[tex] V_{2}= 0.0028 * 471[/tex]

V2 = 1.32L

Therefore, the balloon will occupy a volume of 1.32L at 198°C

Neurons contain which two structures that help them transmit messages?

sarcomeres

dendrites

an extracellular matrix

axons

Answers

Answer:

dendrites

axons

Explanation:

got it right on edg.

Answer:

B and D

Explanation:

edge

Will give Brainiest if you can answer fast

Answers

Answer:

280 m/s

Explanation:

As we will soon see in Section 4.5, gasoline is a complex mixture of alkanes and other hydrocarbons, and the term "octane rating" is used as a standard measure of the performance of engine fuel. In the petroleum industry, one area of interest is the use of catalysts to convert unbranched alkanes and branched alkanes with higher octane ratings (Journal of the Japan Petroleum Institute 2004, 47, 1–10). For example, heptane can undergo isomerization in the presence of suitable catalysts to give eight different constitutional isomers, all of which are branched alkanes with the molecular formula C7H16. Draw all eight constitutional isomers, making sure not to draw the same compound twice.

Answers

Answer:

Explanation:

C₇H₁₆ is heptane and it has nine isomers (n-heptane and the remaining 8 constitutional isomers). Constitutional isomers are compounds with the same molecular formula but different structural formula or atom connectivity.

The constitutional isomers of n-pentane are 2-methylhexane, 3-methylhexane, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 3-ethylpentane and 2,2,3-trimethylbutane. There structures are in the picture attached

which group of substances are elements?
A.Air,water,cooking oil
B.carbondioxide,water,table salt
C.carbon,hydrogen,oxygen
D.rock,soil,iron ore​

Answers

Answer:

C

Explanation:

(A+B) are compounds and D is mixtures

At what time was the frog sitting still or at rest

Answers

Answer:

frogs don't spend all their time swimming, nor do they spend all ... The frog is capable of sitting perfectly still for hours on end, only to suddenly ... When a frog is resting or hunting, he will sit on whatever is handy.

Explanation:

Hope I helped if I did please mark me brainiest Thanks! <333 :3

calulate the molarity
The first solution contains 0.600 mol of NaOH in 2.10 L of solution.
The second solution contains 10.3 g of NaCl in 675 mL of solution.

Answers

1) 0.286 M NaOH
2) 0.261 M NaCl
Hope this helps :)

Phosphorus and molecular oxygen combine to form diphosphorus pentoxide.
Write
a) the word equation
b) the skeletal equation
c) the reactant(s)
d) the product(s)
e) what type of reaction is this?

Answers

Answer:

b

Explanation:

because I really want to talk to you about it when I get home

Describe what will eventually happen to the water level in the beaker.
Explain your reasoning.

Answers

Answer:

The water level in the beaker will eventually go down because some of the liquid water changes into ice (a solid) and the particles get closer together in the beaker. The water level in the beaker will eventually stay the same because some of the liquid water changes into water vapor (a gas) and leaves the beaker.

When does a single-displacement reaction occur?
A. When a substance, usually containing carbon, reacts with oxygen
to produce energy in the form of heat and light
B. When one element replaces another element in a compound
during a chemical reaction
C. When a substance is broken down into two or more simpler
substances in a chemical reaction
D. When a single element forms two double elements

Answers

Answer:

B. When one element replaces another element in a compound during a chemical reaction

Photosynthesis happens in the _____
O: lower epidermis
O: upper epidermis
O: palisade layer
O: spongy layer

Answers

O: palisade layer and please answer the question I am gonna post right now pleaseeee

75 g of a metal is heated to a temperature of 99C. The metal is then placed in a calorimeter containing 145 g of water at a temperature of 25C. The temperature of the water in the calorimeter increase to a final temperature of 28C. What is the specific heat of the metal?

Answers

Answer:

0.34 J / g ⁰C

Explanation:

Let the specific heat of metal be s .

heat will be lost by hot metal and gained by water .

heat lost by metal = mass x specific heat x loss of temperature

= 75 x s x ( 99 - 28 ) = 5325 s

heat gained by water = mass x specific heat x gain of temperature

= 145 x 4.18 x ( 28 - 25 ) = 1818.3

heat lost = heat gained

5325 s = 1818.3

s = 0.34 J / g ⁰C

Statement 1: The reaction follows the mass energy equation E= mc". Statement 2: A large amount of energy is produced during the reaction.
Which statement(s) are true for both fusion and fission reactions? (1 point)
a. Only 1
b. Only 2
c. Both 1 and 2
d. Neither 1 nor 2

Answers

Answer:

Neither

Explanation:

The statements are true for both fusion and fission reactions are the fission is the breaking of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei join together releasing large amounts of energy. Therefore, option D is correct.

What do you mean by fission ?

The term fission is defined as when a neutron slam into a larger atom, forcing it to excite and split into two smaller atoms.

Additional neutrons are released, which can set off a chain reaction. A tremendous amount of energy is released when each atom splits.

When a neutron strikes an atom of uranium-235, it splits into two lighter nuclei, krypton and barium.

Both fission and fusion reactions involve the conversion of some mass into energy in order to form a new nucleus or nuclei, which requires some nuclear binding energy.

Thus, option D is correct.

To learn more about fission, follow the link;

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Chemical equation to show cdso4 dissolves in water

Answers

no se bb si quieres salimos tu sabes

HELPP

35. A catalyst:
a. actually participates in the reaction.
b. changes the equilibrium concentration of the products.
c. decreases the rate for a reaction.
d. increases the activation energy for a reaction.

Answers

I’m pretty sure it’s D.increases the activation energy for a reaction.

Help PlS AFAP and thank you so much

Answers

the answer is B transfer thru direct contact

What factor is mostly responsible for the form of matter?
time
temperature
pressure
weather

Answers

Temperature is mostly responsible for the form of matter. For instance, when raising the temperature you're adding energy. This energy gives the individual molecules and atoms the ability to overcome the forces that hold them together. This can be seen when a solid turns into a liquid or a liquid turns into a gas. However, when you're lowering the temperature you're removing energy. The lack of energy results in less movement from the atoms. Gases condense into liquid because the atoms don't have enough energy to stay away from each other. Liquids solidify because the atoms don't have enough energy to slide past each other and they get stuck in place. So in conclusion, temperature determines how how much energy atoms have that allow them to move at different speeds which determines the state of matter.

A deck of cards has dimensions 8.9cm x 5.72cm x 1.82 cm. What is the volume of the deck in cubic centimeters?

Answers

The volume of the deck having dimensions 8.9cm x 5.72cm x 1.82 cm is 92.65 cubic centimeters.

How to find the volume of the Cube ?

The volume of a cube is obtained by multiplying its side three times. The formula of volume of the cube can thus be given as, Volume of cube = , where s is the side length of the cube.

Given ;

Length : 8.9cmBreadth : 5.72cmHeight : 1.82 cm

Formula used  ;

Volume = Length x Breadth x Height

            = 8.9cm x 5.72cm x 1.82 cm.


             = 92.65 cm³ i.e, 92.65 cubic centimeters

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PLEASE HELP ME!!
I am smaller than Rb and bigger than Na but we are in the same family.
H
K
N
Cs
Is it easier to remove an electron from Mg or from Cl?
Mg
Cl

Answers

Answer: K and Mg

Explanation:

The first one refers to the atomic radius and increases going down and to the left on the periodic table. K is in between Rb and Na.

For the combustion of methane, CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) △H = -213
kcal/mol

How many kilocalories of energy are released from 5.0 mol of methane?
How many moles of methane are needed to give 100. kcal heat?

Answers

Answer:

1.-213(kcal/mol)*5mol=1065kcal

2.100/213 mol

a. The energy released from 5.0 mol of methane is -1065 kcal/mol.

b. The number of moles of methane needed to give 100. kcal heat is 0.4694 moles.

What is combustion?

Combustion is a chemical process in which the element reacts with oxygen to produce heat and light. Burning of wood.

The equation of combustion of methane:

CH₄ (g) + 2O₂(g) ------> CO₂ (g) + 2H₂O (l)

a) Enthalpy of the reaction is H = -213 Kcal/mol

This means 213 Kcal heat is released in the burning of one mole of CH4

H reaction = [ H products ] - [ H reactants ]

Hr = [ H(CO₂)g + 2H(H₂O)l ] - [ H(CH₄)g ] = -213 kcal/mol

For 5 moles of methane:

5CH₄(g) + 10O₂(g) -----> 5CO₂(g) + 10H₂O(l)

therefore, new Hr = 5 x -213 = -1065 kcal/mol

H reaction = -1065 kcal/mol

b) 213 kcal is released per mole of Methane

then, to release 100 kcal we need, 100 / (213) = 0.4694 moles

Thus, the energy released is -1065 kcal/mol, and the number of moles is 0.4694 moles.

Learn more about combustion, here:

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Lithium metal will react with aqueous aluminum sulfate. Write and balance the equation for this rxn, and then determine how many g of aluminum will result from 68.6 g lithium reacting with aluminum sulfate in excess.

Answers

Answer:

88.2 gram of aluminium .

Explanation:

6Li + Al₂ ( SO₄)₃ = 3Li₂SO₄ + 2Al

6 x 7 g                                    2 x 27 g

42 gram of lithium produces     54 gram of aluminium

68.6 gram of lithium will produce   88.2 gram of aluminium .

88.2 gram of aluminium will be produced.        

Electronic configuration PLZZZ GUYSS(sub shell distribution) for L shell will be .........................

Answers

Answer:

Shells

The maximum number of electrons that can be accommodated in a shell is based on the principal quantum number (n). It is represented by the formula 2n2, where ‘n’ is the shell number. The shells, values of n, and the total number of electrons that can be accommodated are tabulated below.

Shell and ‘n’ value Max. Electrons in the Electron Configuration

K shell, n=1 2*12 = 2

L shell, n=2 2*22 = 8

M shell, n=3 2*32 = 18

N shell, n=4 2*42 = 32

L shell:  n =2

hence,

2n²

= 2(2)²

i.e. 8 electrons can fit in the l shell

hence max no. of electrons is 8

so configuration in L shell is,

2, 8...

Which of the following situations best describes an ionic bond?
Two atoms each give up an electron, and an electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force repels them.
Two atoms gain electrons and an electrostatic force attracts them.

Answers

One atom gains an electron while the other atom loses an electron and a electrostatic force attracts them.

The situation which best describes the ionic bond is “ One atom gains an electron while the other atom loses an electron, and an electrostatic force attracts them”.

What is an ionic bond?

An ionic bond is formed between two atoms by donating an electron from the electropositive atom and withdrawal of that electron by the second atom which is electronegative and thereby attaining stability by making their valency completed.

The electron loss-gain interaction make an electrostatic force of attraction between them, where the electrons from the electropositive atom is attracted towards the electronegative atom.

Thus the two atoms are bound together by the electrostatic force of attraction created by the electron donation. Hence, option b is correct.

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A ___ reaction takes two or more reactants to make one product

Answers

Answer:

Synthesis

Explanation:

A sysnthesis reaction takes two or more reactants to create one product

which type of wave shows energy transmitted in a definite direction and with a definite speed?

Answers

The answer is traveling wave

Answer quick (image)

Answers

Answer:

The answer is boiling point

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