What does it mean when there is a physical change?

Question 2 options:

Matter has changed from one substance into another.


Matter has changed on the molecular level.


A new substance has been formed.


Matter has changed size, shape or form

Answer:

He, 2, 2, 2, 4, 4-2=2, 1, 8

I, 53, 53, 53, 127, 127-53= 74, 5, 7

Explanation:

um check the periodic table for the rest?

Answer:

Explanation:

Sonoluminescence is a phenomenon in which small gas bubbles burst to produce light when intense sound wave is introduced. Thus, it can be said that sound energy is converted to light energy here. This is similar to the process of how fire crackers work except that sonoluminescence occurs in a liquid medium while firecrackers work in solid media. In firecrackers, when the tip is lit with fire, the initial explosion is caused by the expansion of some nitrogen and carbon present in some constituent compounds, this explosion produces heat which causes some other constituent chemicals in the firecracker to quickly react and produce light. Thus, this can also be said to convert sound energy to light energy and are thus similar to what occurs in sonoluminescence.

Answer:

4.97 moles

Explanation:

There are  6.022*10^23 calcium  atoms  in 1 mole of  Ca

2.99*10^24/6.022*10^23

=4.97 moles

Answer:

4.97 mol

Explanation:

Given data:

Number of atoms of Ca = 2.99×10²⁴

Number of moles of Ca = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.99×10²⁴  atoms × 1 mol  / 6.022 × 10²³ atoms

0.497×10¹ mol

4.97 mol

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{3.3 \times 100000}{90000} = \frac{330000}{9000 } \\ = 3.666666...[/tex]

We have the final answer as

Hope this helps you

Answer:

1235

Explanation:

if thers a  a guess in that number

The compound V₂O₅ has a Seebeck coefficient at a temperature of 50 °C of -990 μV/K.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

They have a unique chemical structure held together by chemical bonds .Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.

Learn more about compounds,here:

https://brainly.com/question/13516179

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Answer:

natural gas

Explanation:

your welcomeee

Answer:

Physical change: A,C ,D, F, H, I

Chemical Change: B, E, G, J, K

The same object moves quicker through the bare floor than carpet as there has been no friction force acting on the object on the bare floor.

The friction force has been the force that has been applied against the motion of the object. The friction force has been created with the uneven surfaces that result in the slowing of the motion of the object.

The object has been slid against the carpet and the bare floor. The carpet has been the rough surface, that has been able to apply the friction force against the object.  

The bare floor has been the smooth surface that has been able to slide down the object without the application of any friction force that has been able to move the object faster.

Thus, the same object moves quicker through the bare floor than carpet as there has been no friction force acting on the object on the bare floor.

For more information about the speed of the object, refer to the link:

https://brainly.com/question/8156489

Answer

Au2s

please mark me as brainlist

Answer:

ionic

Explanation:

xenom atoms are too large to move in the crystals without first associating with two oxygen ion vacancies and one uranium ion vacancy

Answer:

wood

Explanation:

hope this helps! good luck on ur test :)

Answer:

Wood

Explanation:

Answer:

Explanation:

Send figure below

Answer:

Curbing global carbon dioxide emissions has been a challenge, primarily because they are being driven higher by countries with low per capita emissions.

Explanation:

"just trust me bro"

The correct answer is B. Metalloids

Explanation:

In this periodic table, the green boxes include elements such as Boron (B), Arsenic (As), and Antimony (Sb). All these elements are known in chemistry as semimetals or metalloids. This classification is because these elements cannot be completely classified into metals or non-metals. Moreover, they all display similar properties including some level of conductivity, malleability, and solid-state. According to this, the correct answer is B.

Answer:

B. Metalloids

Explanation:

Answer:

D. apple juice

Explanation:

Answer:

All of the above

Explanation:

answer is atom.Hope it is helpful.

Answer:

Atoms are the smallest particles that made up matter.

Answer:

Explanation:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms.

Answer:

Tonsillitis is inflammation of tonsils. It is caused by viral infection and very rarely by bacterial infection.

It is a very serious problem in case of children, adults and teenagers. The continuous coughing can lead to swelling in the throat which in case affects the  passage of airways.

This hindered air passage can cause breathing problems. The inflammation can also affect the passage of air and affects breathing.

Explanation:

Answer:

it's SrSO4

Explanation:

Answer:

It is an ionic bond.

Explanation:

Ionic bonds occur when a metal and a nonmetal combine, while covalent bonds occur between two nonmetals. Lithium is a metal and sulfur is a nonmetal.

Answer:

mutualism,commensalism and parasitism

Answer:

mutualism, commensalism, and parasitism

Answer:

The enthalpy change of solution refers to the amount of heat that is released or absorbed during the dissolving process (at constant pressure).

Explanation:

Answer:

0.0625

Explanation:

Answer:

62,500

Explanation:

Answer: silicon

Explanation:it just is

Respuesta

es la C. silicio

Explanation:

No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.

En la clasificación de metaloides se suelen incluir a:

Boro (B)

Silicio (Si)

Germanio (Ge)

Arsénico (As)

Antimonio (Sb)

Telurio (Te)

Answer:

Aluminum iodide (AlI₃)

Explanation:

The synthesis reaction of aluminum (Al) and iodine (I) can be illustrated as shown below:

Aluminium exhibit trivalent positive ion (Al³⁺)

Iodine exhibit univalent negative ion (I¯)

During reaction, there will be an exchange of ion as shown below:

Al³⁺ + I¯ —> AlI₃

Thus, we can write the balanced equation for the reaction as follow:

Al + I₂ —› AlI₃

There are 2 atoms of I on the left side and 3 atoms on the right side. It can be balance by putting 2 in front of AlI₃ and 3 in front of I₂ as shown below:

Al + 3I₂ —› 2AlI₃

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:

2Al + 3I₂ —› 2AlI₃

Thus the equation is balanced.

The product on the reaction is aluminum iodide (AlI₃)

Answer:

It's either A. or B. Im going with B. since the person is walking a constant speed

Explanation:

acceleration is basically when someone or something is increasing in speed