Chemistry High School

Two or more atoms that have been chemically combined are
called a

Answers

Answer 1

Answer:

compound

Explanation:

Related Questions

Question 1
Why can't wee see atoms?

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Answer:

They're too small

Explanation:

Atoms are smaller than the wavelength of visible light

Answer:

too small

Explanation:

What do you think is the difference between an "open" system & a "closed" system?

Answers

Answer:

Hope it help you

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Plz mark my answer brainliest✍️✍️

Explanation:

There are three types of systems in thermodynamics: open, closed, and isolated. An open system can exchange both energy and matter with its surroundings. ... A closed system, on the other hand, can exchange only energy with its surroundings, not matter.

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Given the standard heats of reaction

Reaction ∆H 0

M(s) + 2 X2(g) → MX4(g) −98.7 kJ/mol

X2(g) → 2 X(g) +327.3 kJ/mol

M(g) → M(s) −20.1 kJ/mol


calculate the average bond energy for a single

M-X bond.

Answer in units of kJ/mol.

Answers

Answer:

Explanation:

M(s) → M (g ) + 20.1 kJ --- ( 1 )

X₂ ( g ) → 2X (g ) + 327.3 kJ ---- ( 2 )

M( s) + 2 X₂(g) → M X₄ (g ) - 98.7 kJ ----- ( 3 )

( 3 ) - 2 x ( 2 ) - ( 1 )

M( s) + 2 X₂(g) - 2 X₂ ( g ) - M(s)  → M X₄ (g ) - 98.7 kJ -  2 [ 2X (g ) + 327.3 kJ ] - M (g ) - 20.1 kJ

0 = M X₄ (g ) - 4 X (g ) - M (g ) - 773.4 kJ

4 X (g ) +  M (g ) =  M X₄ (g ) - 773.4kJ

heat of formation of M X₄ (g ) is - 773.4 kJ

Bond energy of one M - X bond =  773.4 / 4 =  193.4 kJ / mole

How is iodine 131 similar to a normal atom of iodine?

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Answer: Iodine 131 is a radioisotope with a very short half-life of 8.02 days, making it highly radioactive.

Explanation:

Flowering plants are the most successful group of land plants. This is due, in part, to the trait that could be the label for point C. in the cladogram. Consider the organization of the cladogram. What trait, besides flowers, is unique to this group of plants?

Answers

Answer:

seeds are protected in fruits in such kind of plants.

Explanation:

The flowering plants are also known as Angiospermae, or Magnoliophyta. Flowering plants are plants that grow flowers. Such plants use seeds to reproduce, or make more plants like them.

Seeds are protected in fruits in such kinds of plants.

Examples of flowering plants are daisies, tulips, oaks, apples.

Answer:

Seeds are protected by a fruit

Explanation:

This chart shows characteristics of three different types of atoms.

A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?

Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.

Answers

Atom X will accept electrons from Atom Y.

Answer:

B) Atom X will accept electrons from Atom Y.

Explanation:

because X has 6 electrons and Y has 2 it would make sense for Y to give to X

Where does the heat that is needed to warm the surface of the ocean come from? A. the Sun B. the Earth's interior C. animals D. the Earth's surface

Answers

Answer:

A. The Sun

Explanation:

Answer:

A

Explanation:

Most of our heat source on Earth comes from the Sun.

HELP!!!! PLEASE, it would be much appreciated.

Answers

It is made of cells, D.

d it is made of cells

Explanation:

because it is the one that makes most sense

What is a scale and why do you use it?

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To calculate the weight of something. It is used to find the weight of an object

Answer:

Scale is defined as a system or series of marks used for measuring or registering. An example of scale is what someone would use to figure out the length of something. An example of scale is what someone would use to find out how much they weigh.

Explanation:

A force is always a push. true or false ?

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True because ur using the force to push

What is the term used to describe a change in motion?

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Answer:

it should be momentum if im not mistaken

PLEASE HELP ME!!
Water (H2O) is composed of the same elements as hydrogen peroxide (H2O2).

Why do these substances have different properties?


The molecules are the same.


Water has more atoms than hydrogen peroxide.


The atoms are arranged differently in each molecule.


The atoms are the same.

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Answer:

The molecules are the same.

Explanation:

which element has an atom with the following composition? 24 protons, 28 neutrons and 24 electrons.

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Chromium - 28

The amount of protons is equal to the atomic number and this can always be used to identify the element

in your own words describe the process of a physical change​

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Answer:

A physical change is when the form of an object changes, but the substance stays the same.

Example: Ice melting into water.

PLEASE HELP WILL GIVE BRAINLIEST​

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It’s the atomic number.

Is sulfur dioxide a element?

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yes it is a element.

A black hole is a
a. an object of zero volume and infinite density
b. an object from which nothing, not even light, can escape
c. an object that emits x rays as matter falls into it
d. an object that disappears from our universe
e. all of the above

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Answer:

B. an object from which nothing, not even light, can escape

Explanation:

the amount of space an object occupies is called its

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Volume is the amount of space occupied in a object

What is the process called when the moon bagins to fade from full moon to new moon

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Waining there’s not much to explain here it’s simple moon phases

Heat rising in a hot-air balloon is an example of __________. conduction convection radiation solar

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Answer:Condensation

Explanation:

it

Answer:

convection

Explanation:

I took test I got 100%


Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1

Answers

Answer:

2

Explanation:i did the test

What is the importance of protons ?

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Protons are important because they help keep the nucleus together, they also attract negatively charged electrons and keep them in orbit around the nucleus.

The protons inside a atoms nucleus help to bind the nucleus together. They attract the negative charged electrons and keep them in orbit around the nucleus. The number of protons in an atoms nucleus determine which chemical element it is

A plant's growth response to water is called _____.

hydrotropism
geotropism
gravitropism
thigmotropism

Answers

Answer:

A or Hydrotropism

Explanation:

Answer:

hydrotropism Explanation:

because hydro= water and topism= the turning part of an organism hope this helps!! <3

All covalent compounds donot exist as giant aggregates. Why?​

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This is because of the attractive forces between the molecules with the absence of overall electric charge. Covalent compounds are usually gaseous molecules at room temperature and pressure.

which substance is a mixture? A. table salt B. gasoline C. aluminium D. carbon dioxide​

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B.) Gasoline. Gasoline is a complex blend of compounds made from petroleum. There are various grades of gasoline. Thus it is a mixture

During which process of the water cycle does water change from gas to liquid

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Answer is condensation hope this help you

calculate the oxidation number of s in S2O8^2-​

Answers

Given problem:

    S₂O₈²⁻

Find the oxidation number of S;

Oxidation number presents the extent of oxidation of each atom of elements a molecular formular or formula unit or an ionic radical.

  For radicals:

          "the algebraic sum of all the oxidation numbers of all atoms in an ion containing more than one kind of atom is equal to the charge on the ion  "

 S₂O₈²⁻;   oxidation number of O is usually -2

             2(S) + 8(-2) = -2

               2S - 16  = -2

               2S = -2 + 16

                2S  = 14

                   S  = +7

The oxidation state of S in the radical is +7

Is the equation C2H4 —> 2C + 2H2 + 52.3 exothermic or endothermic?

Answers

Answer:

Exothermic

Explanation:

All 6 sides of a cube measure 65mm. Calculate the volume of the cube in cm32

Answers

Same I need help also

The equation, reactants
product + thermal energy, describes a(n)_____
reaction.

Answers

Answer: Here you go

Explanation:

The general equation for an exothermic reaction is: Reactants → Products + Energy.

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But Belles excitement got the better of her. She said she wanted to try riding by herself. Her father let go. Belle quickly lost her balance and crashed to the ground. The fall dazed her. She grumpily agreed to let her father keep holding the bike while she rode.Every once in a while, he would let go. The moment he did, Belle would lose her balance and topple over. Her father explained that this was perfectly normal. He said that all first-time riders fall. Even so, Belles mood darkened with each fall. After a while, she wanted to give up and return home.Belles father tried to talk her out of quitting. He pointed toward some other children biking nearby. He showed her how happy they looked as they rode their bicycles. He told her she needed to keep trying. With a little more effort, she would soon enjoy riding just like the other children. His words gave Belle the determination to keep going.After several more failed tries, Belle finally got the hang of it. She began gently peddling by herself, beaming with pride. She had finally done it! That night, she went to bed with a couple of bruises and cuts. But she had an even bigger smile on her face than shed had in the morning. She would forever remember this day and the lesson she learned about never quitting.A. Belle starts showing more trust in her father as he teaches her how to ride a bike.B. Belle becomes less excited as the story goes on, until her excitement for bike riding disappears.C. Belle learns both how to ride a bike and how important it is not to give up.D. Belle gets hurt from falling off her bike, which scares her away from bike riding for good. 5 + x - 14 = -15. Solve for X Help please before its taken:) Find the missing side. Round to the nearest tenth. To what extent does the U.S. Constitution address the ideals of the Declaration of Independence? Fill in the blank: Spanish. Is the answer A or B. Explain why. Thanks. Algo______, Sofia? A. Algo te duelen Sofia?(Tu) B. 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