For a chemical change to happen what must atoms be

Answers

Answer 1

Answer:

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.


Related Questions

what is the definition of base

Answers

a substance that increases hydroxide ions in a solution
correct me if i’m wrong .

Members in band noticed that drums seemed to vibrate and play themselves during practice. Why? A. The music was played at an natural frequency of the drums B .The music was so loud it caused the drums to vibrate Help pls!

Answers

Answer:

The music was played at an natural frequency of the drums

Explanation:

The natural frequency of a body is the frequency when we notice that the system oscillates without any driving or damping force. This is also referred to as the normal mode of vibration because all parts of the system move sinusoidally at the same frequency.

So, when music is played at the natural frequency of the drums, the drums tends to vibrate without any driving force. We can now say that the drums are 'playing themselves'.


I dont understand and know the anwser to this

Answers

definitely D makes the most since

In the sixteenth century, the geocentric theory was a daim with substantial evidence. Which of the following best describes why scientists began to regard the heliocentric theory as more acceptable?

Answers

Answer:

The heliocentric theory was better supported by data explaining the rotation of the planets and other bodies in the solar system.

Explanation:

A temperature increase causes the particles to what ??!

Answers

to move around more. bounce off walls ect. they are more energised

Using the equation above, how many moles of Na are produced when 2.75 moles of H2 react with excess NaCl? will give BRAINLIEST

Answers

Answer:

5.5 moles of sodium are produced

Explanation:

Given data:

Number of moles of hydrogen = 2.75 mol

Number of moles of Na produced = ?

Solution:

Chemical equation:

H₂ + 2NaCl      →       2HCl + 2Na

Now we will compare the moles of hydrogen and sodium from balance chemical equation:

                    H₂         :       Na

                     1          :       2

                   2.75      :       2/1×2.75 = 5.5 mol

Thus, 5.5 moles of sodium are produced.

Please help due today

Answers

Answer:

neodymium-145

Guys please I need an answer for this asap

Mg+2HCl -> MgCl2+H2

0.2 mole of mg reacted with 0.2 of HCl

What is the mass of hydrogen gas produced?

Answers

Answer:

Mass of hydrogen gas produced = 0.2 g

Explanation:

Given data:

Number of moles of Mg = 0.2 mol

Number of moles of HCl = 0.2 mol

Mass of hydrogen gas produced = ?

Solution:

Chemical equation:

Mg + 2HCl       →     MgCl₂ + H₂

Now we will compare the moles of of hydrogen with Mg and HCl.

                   Mg          :        H₂

                    1             :         1

                   0.2          :       0.2

                 HCl           :       H₂

                   2             :         1

                0.2            :         1/2×0.2 = 0.1

HCl produced less number of moles of hydrogen gas it will act as limiting reactant.

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 0.1 mol × 2 g/mol

Mass = 0.2 g

What are columns on the periodic table called? What is the significance of the columns on the periodic table?

Answers

Answer:

The vertical columns of the periodic table are called groups, or families. The significance is elements with similar properties are placed in the same vertical columns. The horizontal rows of the periodic table are called periods. The significance is that properties vary from left to right along the rows.

Explanation:

We just did this in science

Answer:

columns in the periodic table are reffered to as "periods". periods represent elements with the same number of shells i.e all elements in period 1 have 1 shell (k shell) and vice versa.

what type of bond( ionic or covalent) does silver and nobelium form?

Answers

Ionic, because it has a metal in it

How do chemists use systems and order in their work?

Answers

Answer:

5 point) Chemists used systems and order because they study the basic unit of all forms of matter, which is the atom . However, there are several different kinds of atoms, called elements . Chemists organize these elements using the periodic table .

Explanation:

Help 15 points!!!
Complete the following combustion reaction.

Answers

Answer:

C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O

2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O

Explanation:

The reaction above is simply termed combustion reaction in which an organic compound react with oxygen to produce carbon dioxide and water. Thus, we can obtain the balanced equation for the reaction reaction as follow:

C₈H₁₈ + O₂ —> CO₂ + H₂O

There are 8 atoms of C on the left side and 1 atom on the right side. It can be balance by writing 8 before CO₂ as shown below:

C₈H₁₈ + O₂ —> 8CO₂ + H₂O

There are 18 atoms of H on the left side and 2 atoms on the right side. It can be balance by writing 9 before H₂O as shown below:

C₈H₁₈ + O₂ —> 8CO₂ + 9H₂O

There are 2 atoms of O on the left side and a total of 25 atoms on the right side. It can be balance by writing 25/2 before O₂ as shown below:

C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O

Thus, the equation is balanced!

The above equation can also be written as follow:

C₈H₁₈ + 25/2O₂ —> 8CO₂ + 9H₂O

Multiply through by 2

2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O

what do you meaning seachants? write with example.

Answers

Answer:

answer

Explanation:

simile is a figure of speech that compares two different things in an interesting way. The object of a simile is to spark an interesting connection in a reader's or listener's mind. A simile is one of the most common forms of figurative language. Examples of similes can be found just about anywhere from poems to song lyrics and even in everyday conversations.

Similes and metaphors are often confused with one another. The main difference between a simile and metaphor is that a simile uses the words "like" or "as" to draw a comparison and a metaphor simply states the comparison without using "like" or "as".

An example of a simile is: She is as innocent as an angel. An example of a metaphor is: She is an angel. Do you see the difference? The simile makes a direct comparison, the metaphor's comparison is implied but not stated.

9) A cactus plant, a snake, and a hawk can be members of the same
A- community
B- kingdom
C- population
D- species

13) gene are part of a
a-cell wall
b-chromsome
c-hormone
D-vitamin

Answers

I have no idea A and d maybe

HELP!!!! I NEED THE EQUATION FOR Neptunium-237 undergoes alpha, alpha, beta, gamma, alpha, beta, alpha, gamma, and alpha decay.
I WILL MARK BRAINLIEST!!!!!!!

Answers

Answer:

..

Explanation:

What is the Molar Mass of Cl4

Answers

Answer:473.39626 g/mol

Explanation:

Answer:

153.82 g/mol

Explanation:

1.5 moles of N2 gas = ______L of N2 gas at STP

Answers

Answer:

33.6 lliter

Explanation:

volume in stp = no of moles *22.4

=22.4* 1.5=33.6liter

Who discovered electrons using Crookes tube?
a.) Democritus
b.) Ernest Rutherford
c.) Hantaro Nagaoka
d.) J. J. Thomson
e.) John Dalton
f.) Niels Bohr

Answers

Answer:

William Crookes????????????????

The answer is D. J.J. Thomson

What are the 4 chambers and what is the function of each?

Answers

Answer:

Where are these Chambers located ], there is hundreds of them in the world

The circulatory system has 4 chambers - 2 Atria and 2 ventricles.
2 Atria - the left atrium receives blood from the pulmonary (lung) circulation, and the right atrium receives blood from the venae cavae (venous circulation). The atria receive blood while relaxed (diastole), then contract (systole) to move blood to the ventricles.

2 Ventricles - two ventricles that operate in a double circulatory system: the right ventricle pumps blood into the pulmonary circulation to the lungs, and the left ventricle pumps blood into the systemic circulation through the aorta.

What role does valence electrons play in reactivity for an element?

Answers

Explanation:

The valence electrons within an atom is the number of electrons in its outermost shell.

These electrons are used by an atom to react with one another. They  determine the extent to which an atom is ready to combine either by losing, gaining or sharing these electrons.

Every atom desires to have a completely filled outermost shell. Only the elements in group 8 have a complete octet. The need to attain stability is driven by the number of electrons in their valence shell. Therefore, some atoms are very reactive. Those needing one electrons to complete their octet and also those that must lose one electron are very reactive.

While both comets and asteroids are found to orbit the sun in our solar system which system which choice correctly explain how they are different

Answers

Answer:

Comets are made of ice, dust, and rocky material. Asteroids are made of rock and metal material.

Explanation:

thats how they are different from each other

Can anyone help me with the final answers plzzzzz

Answers

1- CaCl2
2- Na2O
3-Cs2S
4- Al2Se3
1- Ca +2 Cl -1
2- Na +1 O-2
3-Cs +1 S-2
4- Al +3 Se -2

A solution of nitric acid is formed by dissolving 5.00grams of nitric acid in enough water to make 1.5 liters of solution.

c. What was the molarity of this solution?

d. What is the pH of this solution?

Answers

Molarity = 0.053 M

pH = 1.276

Further explanation

Given

5 g of HNO₃

1.5 L solution

Required

Molarity

pH

Solution

Molarity shows the number of moles of solute in every 1 liter of solution.

mol HNO₃(MW=63 g/mol) :

= mass : MW

= 5 g : 63 g/mol

= 0.079

Molarity :

=0.079 : 1.5 L

= 0.053 M

pH = -log [H⁺]

For strong acids like HNO₃ :

[H⁺] = a.M

a = valence of acid / amount of H⁺ released  

M = acid concentration.  

HNO₃ ⇒ H⁺ + NO₃⁻⇒ valence 1(amount of H⁺=1)

[H⁺]=1 x 0.053

[H⁺]= 0.053 M

pH= - log 5.3 x 10⁻²

pH = 2 - log 5.3

pH= 1.276

Good quality water is needed for a healthy life.
In the United Kingdom, obtaining safe water for drinking is as simple as turning on a tap. The water is made safe to drink by what and companies.
However, in many parts of Africa and Asia, water used for drinking is contaminated and untreated. It is estimated that 2.2 million people die each year as a result of drinking contaminated water.

Explain why water for drinking is filtered and then treated with chlorine.

Answers

Answer:

Simply cuz so u can drink It without bacteries chlorine also changes a bit taste depends on RM

!Do not use this answer for cheating, please only use my answers to check your own!

Before tap water was found, people would use rocks, gravel, and sometimes even thick cloth to filter water. If you do not filter water, there is a huge chance that bugs, bacteria, viruses, and other things may be entering your body. Today some houses still have the past was of filtering, with rocks and gravel. Except chlorine is used to kill any bacteria that was left over the rocks and gravel may of missed.

2
What is the weight of an object of mass 8.5 kg?

Answers

Answer:83.3 (kg*m)/s^2

Explanation:weight is the combination of the mass of an object and the gravitational force on it.

Weight=mass (kg) * gravity

Gravity=9.8 m/s^2

Weight= (8.5 kg)*(9.8 m/s^2)

There are 83.3N of weight in an object of mass 8.5 kg.

HOW TO CALCULATE WEIGHT:

The weight of an object is the mass of the object in relation to gravity. Weight is measured in Newton (unit of force).

The weight can be calculated by multiplying the mass of the object by acceleration due to gravity on Earth i.e.

Weight (N) = mass (kg) × gravity (m/s²)

According to this question, an object with a mass of 8.5kg is given. The weight is calculated as follows:

Weight = 8.5kg × 9.8m/s²

Weight = 83.3N

Therefore, there are 83.3N of weight in an object of mass 8.5 kg.

Learn more at: https://brainly.com/question/8164654?referrer=searchResults

Which of the following substances would have the highest dispersion forces? Why?
Ne, FCI, N2H4 SO2, SO3, C20H42, MgO, Si, CsI, Sn, H2O, CCl4​

Answers

Answer:

Si

Explanation:

Dispersion force or London force is the force of attraction between two atoms or molecules in a substance in solid , liquid and gas . In gas , this force is minimum and in solid this force is maximum . In solid this force is maximum in metals in which this force forms  metallic bond .

Among the given substances , Si , Sn , MgO , C₂₀H₄₂ are solid , so dispersion force will be high in them .

Among all as mentioned above , Si will have highest dispersion force . It is due to four covalent bond that bind two atoms of Si in solid silicon . Its three dimensional crystal structure consist of silicon atoms , all bound by four covalent bonds .

What is a reaction rate?

Answers

Answer:

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume)

Explanation:

Answer:

A measure of how fast products are made in a reaction.

Explanation:

i just took the test and it gave me this cuz the other person was wrong

Isotopes are atoms of the same element that have the same chemical property but may not have the same physical properties A true B false

Answers

Answer:

false

Explanation:

Atoms of the same element that differ in their numbers of neutrons are called isotopes. Many isotopes occur naturally. ... Different isotopes of an element generally have the same physical and chemical properties because they have the same numbers of protons and elec

Answer:

False

Explanation:

It says that it may not have the same physical properties but it always have the same physical properties.

please help

if a molecule is polar, what is true about the distribution of its valence electrons

Answers

A punta la kk bien echo


A white solid was left out after a class had tidied up their
experiment. During the experiment, one of the pupils had
removed the label on the white solid. The teacher knew the
solid was a Group 1 metal halide, so they performed a
flame test followed by a silver nitrate test. The flame test
gave a red flame, and the silver nitrate test gave a cream
precipitate. What is the white solid?

Answers

Answer:

LiBr

Explanation:

Group 1 metals give a characteristic colour when subjected to flame test. The colour can tell us exactly what the identity of metal being studied.

Now, Lithium metal gives a red flame. Hence the group 1 metal ion is Li^+. Similarly, bromides give a creamy precipitate when reacted with silver nitrate.

This means that the solid substance under study is LiBr.

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