which two sentences taken together provide the best evidence to support the ideas that both physical and chemical change can significantly change the appearance of a substance ?

A. in a physical change the material involved is structurally the same before and after the change

B. a piece of metal may be heated in a fire until it glows but the metal is the same material before Heating and after Cooling

C. chemical changes require the breaking and forming of chemical bonds during a chemical reaction

D. the creation of a new ,solid substance from to liquid substance into the kids that a reaction has taken place that has alerted the original substance ​

Answer:

A ithink

Explanation:

The chemical changes require the breaking and forming of chemical bonds during a chemical reaction. The correct option is C.

Chemical Bonding refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound.

These chemical bonds are what hold the atoms in the resulting compound together.

A chemical bond is a bond formed when the atoms in a compound's molecule combine and are held together by a strong combining force.

Chemical bonds are classified into two types namely ionic bonds and covalent bonds.

Chemical bonding enables scientists to combine the elements of the periodic table in a variety of ways to create chemical compounds and materials.

Thus, the correct option is C.

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Which mineral will scratch glass?

1. Sara wants to see if a new brand of hair dye lasts longer than the brand she
currently uses. She puts the new hair dye on the left side of her head and the old
brand on her right side. After 2 weeks she observes which side of her head has
more gray hair showing through.

Select the correct answer.

What are the oxidizing agent and the reducing agent in this chemical equation?

3FeS + 8HNO3 → 3FeSO4 + 8NO + 4H2O

A.
FeS is the oxidizing agent, and HNO3 is the reducing agent.
B.
HNO3 is the oxidizing agent, and NO is the reducing agent.
C.
FeS is the reducing agent, and HNO3 is the oxidizing agent.
D.
HNO3 is the reducing agent, and NO is the oxidizing agent.

what is the first step in this process

Which energy transformation occurs in an
electric motor?

If you have 3 moles of O2, how many O2 molecules do you have?

What is an alkaline earth metal that has 5 shells?

Need a bit of help with this. Fill in the coefficients, explain your answer.

If 6.49 mol of ethane (C2H6) undergo combustion according to the unbalanced equation
C2H6 + O2 −→ CO2 + H2O ,
how many moles of O2 is required?
1. 27.79
2. 7.63
3. 8.4
4. 25.48
5. 12.635
6. 21.035
7. 23.8
8. 19.04
9. 22.715
10. 26.775
Answer in units of mol.

PLEASE HELP!!! A dive tank at 3000 psi has a temperature of 30° C on the boat. What would the pressure be when diving in 14° C water? Assume the volume and number of particles stayed the same.

how acetophenone can be converted to phenol by reaction?
a) m-CPBA followed by base catalysed hydrolysis
b) conc. HNO3
c) iodine and NaOH
d) Singlet oxygen followed by base catalysed hydrolysis product​

Wher do most living thing get the energy they need for life

What does how light or dark an object appears depend on?

if two molecules of glucose (c6h12o6) are joined via condensation synthesis, the resulting molecule would have a molecular formula of .

whoever answers this first gets brainly

Which statement is true about nuclear fusion?
A: It is caused by the same process that causes nuclear fission.
B: It does not occur naturally in the solar system.
C: It has very low activation energy.
D: It produces nearly all the elements that are heavier than helium.

can anyone answer this question pleaseeeee

the answers to the Lab: Calorimetry and Specific Heat
step3:
aluminum- 11.98
copper-12.14
iron- 12.31
lead- 12.46
step5: 12.46, 52.31, 39.85
step7: 100, 22.4, 27.1, 4.7, 72.9
step5: 12.26, 52.49, 40.13
step7: 100, 22.7, 24.6, 1.9, 75.4
step5: 12.42, 52.66, 40.24
step7: 100, 22.5, 24.9, 2.4,75.1
step5: 12.34, 51.99, 39.65
step7: 100, 22.6, 23.3, 0.7, 76.7
step8: 0.90,0.35,0.44,0.12

Which process is a genetic engineering process?
exposing food to radiation, which causes mutation in the genes
removing DNA from cells of the food
replacing some genes of the food with genes from other species
protecting food with an antimicrobial coating

Electron configuration of vanadium-52

Question
Review the electron configurations of the elements in period 3, from sodium (Na) to argon (Ar). What do you observe?
Select the correct answer.
The electron configuration for chlorine does not follow the pattern of the other elements in period 3.
After the 3s sublevel is filled with two electrons, each additional electron goes into the 3p sublevel.
O After the 3p sublevel is filled with six electrons, each additional electron goes into the 3s sublevel.
The electron configuration of magnesium does not follow the pattern of the other elements in period 3.
Submit
Part B
us 12

Energy from the Sun reaches Earth mainly by the process of *
1 point
conduction
convection
reflection
radiation

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Answer all Questions And will mark brainliest if not will not mark
When swinging on a park swing when is your kinetic energy the least?

Question 1 options:

Kinetic energy is least at the lowest point of your swing when you are closest to the ground.


Kinetic energy is the least when you are halfway between the highest point of the swing and the bottom.


Kinetic energy is least at the at the top of the swing when you are still for a moment just before falling again.


Kinetic energy is least as you are moving past the bottom of the swing and going back up to the highest point.

Question 2 (3 points)
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as a skateboarder rides a halfpipe or a pendulum moves, why did the bar for the total energy remain constant?

Question 2 options:

all answers given are correct


Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.

Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.

This is because no energy is being created or destroyed in this system

Question 3 (3 points)
Studying energy involves determining the amount of energy an object has. This energy can be kinetic or potential, or it could be a combination of both. Consider a 2-kg bowling ball sits on top of a building that is 40 meters tall. It falls toward the ground. Think about the amount of kinetic energy the bowling ball has as it falls, select when the ball would have the most kinetic energy from the choices given.

Question 3 options:

after it hits the ground and is no longer moving.


as it sits on top of a building that is 40 meters tall.


as it is halfway through the fall and it has reached a speed of 19.8 meters per second.


just before it is to hit the ground and it has reached a speed of 28 meters per second.

Question 4 (3 points)
How can you increase the gravitational potential energy (GPE) of an empty shoe box on the middle shelf of a bookcase?

Question 4 options:

raise the box to a higher shelf


add items to the box and raise it to a higher shelf


all of the options listed here will increase the GPE


add items to the box to increase its mass on the self it is on

Question 5 (3 points)
Which is an example of an object increasing its kinetic energy

Question 5 options:

an airplane after parking at the gate on the airport runway


a rocket resting in the docking claps just before the launch sequence it to begin


a jogger running faster after spotting a mountain lion following him on the trial


a train that is no longer moving and has come to a complete stop at the station platform so people can board

Question 6 (3 points)
Changing which factor would NOT influence the total kinetic energy of a moving shopping cart?

Question 6 options:

Decreasing the mass or the speed of the cart


increasing the rate of speed you push it down the aisle


increasing the mass of the cart by adding items while moving


Turning a different direction at the end of the aisle while continuing to move at the same speed.

Question 7 (3 points)
Mechanical energy is defined as

Question 7 options:

potential energy


Energy of machines and tools


the energy of motion and position, which is represented by the formula KE + PE = ME


Energy of motion

Question 8 (3 points)
Two children are waiting to go down a slide. The first child goes down and then stays sitting at the bottom of the slide. If there is no friction involved and all of the mechanical energy is conserved what would happen to the energy of the second child from the top to the bottom of the slide?

Question 8 options:

All energy stays the same, it does not change


The energy is destroyed


Kinetic energy would turn in to Potential energy at the bottom


Potential energy from the top of the slide would turn to Kinetic energy as they slide down, in turn the kinetic energy of the child coming down the slide will be given to the child sitting at the bottom when they collide.

Question 9 (3 points)
Conservation of mechanical energy is defined as

Question 9 options:

Energy of motion


Potential energy added to kinetic energy


Law of conservation of energy


The sum of the kinetic and potential energies of an object remains a constant value unless there are forces acting on the object that cause a loss of energy overall, such as friction and air resistance

Question 10 (3 points)
Which is an example of gravitational potential energy only.

Question 10 options:

a puppy walking around under a tree


an apple resting on the teacher’s desk


a rolling skateboard going down a hill


an elevator moving up to the 3rd floor

PLEASE I NEED HELP!!
You find a ring with a mass of 89.2g. You fill a graduated cylinder up with 10mL of water
and put the ring into the cylinder. The water mark rises up to the 20mL mark. What is
the ring made of?
Solids
Table of Densities
Density g/cm
Solids
2.56
Copper
2.64
Gold
3.52
Platinum
Density g/cm
8.92
Marble
Quartz
19 32
Diamond
214
O Marble
Quartz
Copper
Gold

Which coefficients will balance the following reaction:

The movement of the tectonic plates on the earth is caused by

true or false: u find soil rich in humus in horizon c

What’s the difference between a learned behavior in an inherited behavior? Give one example of each

Compute the following and give your answer in scientific notation:
(3.51 x 10-²) - 2.94 × 10-²
=
× 10^

A substance has a mass of 100 g and a volume of 10 mL. What is the
density of the substance? *
0 0.05 g/mL
0 2.0 g/mL
0 10 g/mL
0 20 g/mL