Which changes involve forming or breaking chemical bonds?

A.burning and digesting

B.boiling and melting

C.burning and melting

D.rusting and cutting

Answers

Answer 1

Answer:

d

Explanation:

i took the test


Related Questions

How many molecules are in 937 g of calcium acetate?

Answers

Answer:

158.17

Explanation:

divide the given mass by the molar mass

Luciana explains to Eric how electricity flows in a circuit. Which sentences are a part of her explanation? Select all that apply.



A. Without a resistor, electricity cannot flow in a circuit.


B. Without a switch, electricity cannot flow in a circuit.


C. For electricity to flow in a circuit, the circuit must be complete.


D. An insulator such as plastic is needed for electricity to flow in a circuit.


E. A conductor is needed for electricity to flow in a circuit.

Answers

I’m pretty sure it c hope that helped

Answer:

E. A conductor is needed for electricity to flow in a circuit.

Explanation:

Electric current can flow without a resistor, as in short circuit.

A short circuit is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance.

Without a switch, electricity can flow in a circuit, switch is only used to close or open the circuit.

Thus, the only correct option is  E

E. A conductor is needed for electricity to flow in a circuit.

Draw a heating curve for a solid
Pls pls helppppp
I will mark u as Brainly and award 30 points !!!!

Answers

Answer:

Equation:

Q = m•C•ΔT

You can find a video under AboodyTV about heating curves and how to draw them.

HURRY I NEED HELP!! Please answer!!

Answers

Answer:

I'm confused on what u need us to answer

Beryllium
Symbol: Be
Atomic number: 4
Atomic mass: 9.012182 u

Lithium
Symbol: Li
Atomic number: 3
Atomic mass: 6.941 u

energy is lost due to

Answers

Answer:

Friction

Explanation:

Energy is lost to heat as the object overcomes kinetic friction as it slides up the ramp. The energy loss is equal to the work done by the friction force.

Can someone please help

Answers

Answer:

3

Explanation:

3 ampers (it says in the problem)

Can anybody help me with this please

Answers

Answer:

30

Explanation:

its pushed into a 30 resistor

There are several ways to model a compound. One type of model is shown. A central C attached to 3 C's by 1 line each, each of the 3 C's being attached to 3 H's by a 1 line each. The central C is also attached by 1 line to a C, which is attached to 2 H's and a C by a single line each. The C is attached by 2 lines to an O ad by 1 line to another O. The O with 1 line is attached by 1 line to an H. What is the chemical formula for the molecule modeled? CHO C4H11O2 C6H12O2 C6H9O

Answers

Answer:

C6H12O2

Explanation:

The first step in accurately deducing the structure/formula of the model is to count the number of carbon atoms, hydrogen atoms and oxygen atoms mentioned in the model. This gives the molecular formula of the compound.

Next, you look at there arrangement of atoms and bonds as stated in the model, this tells us the structure of the molecule and confirms the molecular formula initially deduced.

The structure of the compound is shown below.

Answer:

Your answer would be C6H12O2

Explanation: I hope I helped you :)

Is wax ionic or covalent? why?

Answers

Answer:

Candle wax will melt to a liquid and burn as a gas. Only covalent compounds can be liquid or gas!

Explanation:

Question: Is Wax Ionic Or Covalent? - Ceramicsexpandusceramics.com

In the given question, wax is a covalent compound because it is composed of nonmetal atoms that share electrons to create covalent bonds.

Covalent compounds are formed when two or more nonmetal atoms share electrons in order to achieve a stable electron configuration.

Wax is made up of long-chain hydrocarbons, which are molecules that contain only carbon and hydrogen atoms. The carbon and hydrogen atoms in these molecules share electrons to form covalent bonds.Ionic compounds, on the other hand, are formed when a metal and a nonmetal react.

Therefore, wax is a covalent compound because it is made up of non-metal atoms sharing electrons to form covalent bonds.

Learn more about covalent compounds here:

https://brainly.com/question/11632372

#SPJ6

How many bromine atoms are present in 38.7 g of CH2Br2

Answers

Number of Br atoms : 2.679 x 10²³

Further explanation

The mole is the number of particles contained in a substance

1 mol = 6.02.10²³

Moles can also be determined from the amount of substance mass and its molar mass

[tex]\tt mol=\dfrac{mass}{MW}[/tex]

Proust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements

mass of Br in CH₂Br₂

[tex]\tt mass~Br=\dfrac{2.Ar~Br}{MW~CH_2Br_2}\times mass~CH_2Br_2\\\\mass~Br=\dfrac{2.80}{174}\times 38.7=35.59~g[/tex]

mol of Br

[tex]\tt \dfrac{35.59}{80}=0.445[/tex]

number of atoms

[tex]\tt 0.445\times 6.02\times 10^{23}=\boxed{\bold{2.679\times 10^{23}}}[/tex]

N(p+) = 12, N(n0) = 14, N(e-) = 10

Answers

Answer:

Mg[tex]^+2[/tex]

Explanation:

Es el elemento que buscas.

How does bacteria from a fecal transplant help the patient with an C. difficile infection?

Answers

Answer:

difficile infection. By reintroducing a healthy diversity of bacteria, fecal transplantation can re-establish colonization resistance to prevent C. difficile from gaining a foothold and becoming a dominant organism in the environment of the gut.

Explanation:

5. an atom that has lost or gained an electron and has become charged
A.ion
B. proton
C. ionic bond
D. compound

Answers

Answer:

It would be compound.

Explanation:

It is this way because if it adds another proton it becomes more positive that nuetral, and if you add an electron it just makes the atom more dense. That is why the answer is compound. Hope this helped :)

What affects the pressure of an object? *

Answers

The pressure exerted on a surface by an object increases as the weight of the object increases or the surface area of contact decreases . Pressure depends on the amount of gas , the temperature, and the volume of the container .

HELPS MEEEEEEEEEEEEE!!!!!!!!!!!!!
Conduction is ______________.
A. When particles transfer energy by touching.
B. None of these
C. When the sun warms an object.
D. The flow between warm and cool sections of a fluid.

Answers

Answer:

a

Explanation:

Answer:A. When particles transfer energy by touching.

Example: After a car is turned on, the engine becomes hot.

19. Who was the first female astronomer

A.Aristotle
B.En Hedu’Anna
C.Archimedes
D.Plato

Answers

Answer: A.En Hedu'Anna

Answer:

En Hedu’Anna!

Explanation:

A car travels at 35.0 mi/hr. How far has it gone in 2455 seconds?

Answers

Answer:

The answer is 23.8 miles

Explanation:

The distance covered by an object given it's velocity and time taken can be found by using the formula

distance = velocity × time

From the question

velocity = 35.0 mi/hr

time = 2455 s = 0.68 hr

We have

distance = 35 × 0.68

We have the final answer as

23.8 miles

Hope this helps you

Please answer correctly !!!!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!! And explain please !!!!!!!!!!!!

Answers

Copper(II) chloride is a blue-green solid. When placed in water, the crystals turn bright green with a slight blue tinge in the water above the crystals. When stirred, the crystals dissolve and form a light blue solution

Hope this is your answer i wasn't able to see he full question so i am not sure

which element is a liquid at 1000 K

Answers

HG is liquid at 1000 K

Answer:

it is aluminum (Al)

Explanation:

Is it true or false??. . .Help me please

Answers

Answer:

I think the answer is true

The capability of a substance to be stretched into thin wires without breaking is known as —
A malleability
B conductivity
C luster
D ductility

Answers

the answer is ductility

Answer:

The answer is D, ductility

Explanation:

The definition of ductile is "(of a metal) able to be drawn out into a thin wire."

Which of the following numbers is in correct Scientific Notation
13.6x103
174.5
O 0.26x10-2
1.5x105
Question 6

Answers

Answer:

1.5 x 10⁵

Explanation:

Scientific notation always starts in the 1's place (1.)

The main goal of science is to

Answers

Answer:

The goal of science is to learn how nature works by observing the natural and physical world, and to understand this world through research and experimentation.

Explanation:

HELP PLEASE!!!
chemistry question

Answers

Answer:

Its going to be D) In sigma bonds the electrons are in the space between the joined atoms and pi bonds above and below the joined atoms

The answer is D
The electrons are in the space above and below the joined atoms.

What is a mixture meaning

Answers

Answer:

A mixture is a substance of different things combined together.

Explanation:

Hope this Helps!

Radioactive isotope X has a half-life of 500,000 years. This isotope may be found in some types of volcanic rocks. A particular sample of volcanic rock taken from a layer that covered up some of the earliest known human-like footprints contains 0.125 mg of isotope X. The volcanic rock sample originally contained 8.00 mg of isotope X. How long ago were these footprints made. I need the equation. Thanks. please I am stuck on this question. PLEASE

Answers

Answer:

The age of the earliest known human-like footprints is approximately 3000000 years.

Explanation:

Decay of isotopes is represented by the following ordinary differential equation:

[tex]\frac{dm}{dt} = -\frac{m}{\tau}[/tex] (Eq. 1)

Where:

[tex]\frac{dm}{dt}[/tex] - First derivative of mass with respect to time, measured in miligrams per year.

[tex]m[/tex] - Current mass of the isotope, measured in miligrams.

[tex]\tau[/tex] - Time constant, measured in years.

Now we proceed to obtain the solution of the differential equation:

[tex]\int\limits {\frac{dm}{m} } = -\frac{1}{\tau}\int dt[/tex]

[tex]\ln m = -\frac{t}{\tau}+C[/tex]

[tex]m(t) = e^{-\frac{t}{\tau}+C }[/tex]

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (Eq. 2)

Where:

[tex]m_{o}[/tex] - Initial mass of the isotope, measured in miligrams.

[tex]t[/tex] - Time, measured in years.

[tex]\tau[/tex] - Time constant, measured in years.

We proceed to clear time within the formula presented above:

[tex]\ln \frac{m(t)}{m_{o}} = -\frac{t}{\tau}[/tex]

[tex]t = -\tau \cdot \ln \frac{m(t)}{m_{o}}[/tex]

In addition, time constant can be found as a function of half-life:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (Eq. 3)

If we know that [tex]t_{1/2} = 500000\,yr[/tex], [tex]m_{o} = 8\,mg[/tex] and [tex]m(t) = 0.125\,mg[/tex], the age of the earliest known human-like footprints is:

[tex]\tau = \frac{500000\,yr}{\ln 2}[/tex]

[tex]\tau \approx 721347.520\,yr[/tex]

[tex]t = -(721347.520\,yr)\cdot \ln \left(\frac{0.125\,mg}{8\,mg} \right)[/tex]

[tex]t \approx 3000000\,yr[/tex]

The age of the earliest known human-like footprints is approximately 3000000 years.

What is the correct lewis dot structure for
24
12Mg 2+?

Answers

Answer:

Mg with 2 dots

Explanation:

Mg: as the valnce shell of Mg has 2 electrons only

presented by 2 dots


Which of the following pairs of elements belong to the same period?

Answers

Answer:

He and Ar

Explanation:

help quick please?????

Answers

Answer:

the core

Explanation:

Answer:

3rd option, the core.

Explanation:

H2+ 02 H2O

how do you balence this ​

Answers

Answer:

As the number of atoms in the reactants side is equal to the number of atoms in the product side, the reaction is balanced

Two hydrogen molecules per oxygen molecule are produced because water (H2O) has a ratio of two hydrogen atoms to one oxygen atom. A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B.

H2O is the chemical formula of water. It means that each molecule of water is made up of two hydrogen atoms, indicated by the letter H, and a single oxygen atom, represented by the letter O. Water is chemical substance with no smell, taste or color.

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