which one represents an element

Answers

Answer 1

Answer:

Explanation:

Related Questions

A combustion reaction occurs between one molecule of methane (CHa) and two molecules of oxygen (O2).
How many atoms of carbon, hydrogen, and oxygen make up the products for this combustion reaction?
O A) 1 carbon, 1 hydrogen, and 1 oxygen
O B) 1 carbon, 1 hydrogen, and 2 oxygen
O C) 1 carbon, 4 hydrogen, and 2 oxygen
OD) 1 carbon, 4 hydrogen, and 4 oxygen

Answers

The total number of atoms make up the products :

D) 1 carbon, 4 hydrogen, and 4 oxygen

Further explanation

Complete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.

If O₂ is insufficient there will be incomplete combustion produced by CO and H and O

Hydrocarbon combustion reactions (especially alkanes)

For combustion of methane (CH₄) and two molecules of oxygen (O₂).

[tex]\tt CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]

The number of atoms make up the products

CO₂ : 1 carbon, 2 oxygen

2H₂O : 4 hydrogen , 2 oxygen

The total number of atoms make up the products :

D) 1 carbon, 4 hydrogen, and 4 oxygen

Combustion Reaction:

Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.

Combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.

If O₂ is insufficient there will be incomplete combustion produced by CO and H and OFor combustion of methane (CH₄) and two molecules of oxygen (O₂).The number of atoms make up the products:

CO₂ : 1 carbon, 2 oxygen

2H₂O : 4 hydrogen , 2 oxygen

Thus, the correct option is D.

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What Element am I?
I have 5 Valence Electrons.
I am in the 5th row.
My atomic mass is less than Bismuth *
с

Answers

Answer:

Nitrogen

Explanation:

Nitrogen has 5 Valence Electrons.

And its atomic mass is also less than Bismuth.

There are other elements in the 5th row but this one has the lowest atomic mass compared to the others.

Does the number of molecules change when a substance changes state?

Answers

Answer:

Molecules do't break up and reform when a substance boils and cools. Particles stay the same size and shape during state changes.

Explanation:

brainliest will be appreciated

The sphere was dropped into water in a graduated cylinder as shown below

Answers

Answer:65 ML

Explanation:

A 4.86 g piece of metal is placed in a graduated cylinder containing 15.5 mL of water the water level rose to 17.3 mL what is the density of the metal

Answers

Answer:

The answer is 2.70 g/mL

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 4.86 g

volume = final volume of water - initial volume of water

volume = 17.3 - 15.5 = 1.8 mL

So we have

[tex]density = \frac{4.86}{1.80} \\ [/tex]

We have the final answer as

2.70 g/mL

Hope this helps you

the only nonmetal in group 1

Answers

Answer:

Hydrogen

Explanation:

Hydrogen is the only non metal in group on of the period table of elements.

PLEASE ANSWER FAST
A model of an atom is shown above. The blue dots represent electrons, and the red dot represents the nucleus. This model accurately represents
A.
that electrons are found everywhere in an atom, even in the nucleus.
B.
what an atom would look like when seen through a microscope.
C.
that a single atom may have many nuclei.
D.
that the nucleus is located at the center of the atom.

Answers

Answer:

D. that the nucleus is located at the center of the atom

I hope that this helps!

There are several atomic models which explain the structure of atoms. Here the given model of atom is similar to Rutherford's model of atom. The nucleus is located at the center of the atom. The correct option is D.

What is Rutherford's atomic model?

In Rutherford's atomic model, he bombarded a thin sheet of gold foil with high energy alpha particles and made several observations. He said that most of the space inside the atom is empty. A heavy positively charged body called nucleus is present inside the atom.

The nucleus is capable of repelling and deflecting highly energetic alpha particles and also has a appreciable mass and charge. The volume occupied by the heavy positively charged body must be very very small.

Here in the given model, blue dots are electrons which revolve around the nucleus and the red dot is the nucleus which is present at the centre.

Thus the correct option is D.

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7. If we have the same number of protons and electrons, our atom is ___________________________.

A: Negative
B:Positive

Answers

Answer:

It's actually Neutral

Explanation:

equal number of negative electric charges (the electrons) and positive electric charges (the protons).

Pleaseee help me on this

Answers

D I think you got it right. Hope this helps :)

How can some of the difficulties caused by the Down Syndrome be over come?

Answers

there is no single, standard treatment for down syndrome.

Which postulate of Dalton’s atomic theory has not been disproved by further investigation?
A. All matter is made of tiny particles called atoms.
B. Atoms are indivisible and indestructible.
C. All atoms of a given element have the same mass.
D. Atoms of an element are all identical.

Answers

Answer:

The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons...

hope this helps u

The Daltons atomic model gave the theory of chemical combination and the law of conservation of atoms. All matter is made of atoms is not disapproved. Thus, option A is correct.

What was Dalton’s atomic theory?

Dalton’s atomic theory was given by John Dalton and involved several main points. According to the theory that matter has been composed of tiny atoms that are indestructible and indivisible.

It also stated about the mass, as atoms of various elements have different masses and the properties are shared by the atoms of the same element only. It gave rise to the law of conservation of mass, definite, and multiple proportions.

One of the laws is about matter being made of tiny particles called atoms. It has been not disproved by further investigation in any of the atomic models and theories.

Therefore, option A. the matter is made of atoms is not disproved.

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The equation 1/2 N2 + 3/2 H2+ NH3 is not appropriately written because

Answers

Answer:

Madar choad sale kuuuta kamina

will ya'll help me, please

Answers

Answer:

Either A or D

But i think D

hope this helps =3

sorry if im wrong

True or False?

To increase acceleration of a object, you reduce its mass or increase the applied force.

Answers

this is true, " To increase acceleration of an object, you reduce its MASS or increase the applied force."

It is true hope it helps

help please lol I’m stuggling

Answers

Answer:

balenced

Explanation:

PLEASE HELP!!!!!
How much energy is needed to raise the temperature of 2.5 L of water from 20 C to 50 C? (anwer must be in Joules)

Answers

Answer:

8368 Joules

Explanation:

How are hypotheses different from theories?

Answers

Answer:

Explanation:

This is the Difference Between a Hypothesis and a Theory. In scientific reasoning, a hypothesis is an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data.

A given sample of oxygen occupies 500 mL when the pressure is 800 mmHg. What volume will the gas occupy at 200 mmHg, provided the temperature remains constant?

Answers

Answer:

The volume of the gas at 200 mmHg will be 2 L.

Explanation:

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case:

P1= 800 mmHgV1= 500 mLP2= 200 mmHgV2= ?

Replacing:

800 mmHg* 500 mL= 200 mmHg* V2

Solving:

[tex]V2=\frac{800 mmHg* 500 mL}{200 mmHg}[/tex]

V2= 2,000 mL= 2 L (being 1,000 mL=1 L)

The volume of the gas at 200 mmHg will be 2 L.

two atoms are isotopes of the same element, the atoms must have

Answers

Answer:

the answer is isotopes

I hope this will help you

Is this isotope stable or radioactive?

Answers

Answer:

radioactive

Explanation:

becasue i said so. Periodt

Answer:

An unstable isotope emits some kind of radiation, that is it is radioactive.

Explanation:

PLEASEEE HELPPP!!!! AND EXPLAIN PLS

Answers

Answer: True?

Explanation: THere is no question but I do know that is true because I answers that on a test and got it right. It was asking about:

how many Helium and oxygen molecules = H2O = + O2

How did Moseley establish a more accurate periodic table?

Answers

He arranged the elements by atomic mass instead of atomic numbers. I might be wrong they have the answer on google as well it says. “by arranging the elements according to atomic mass instead of atomic number. by arranging the elements according to atomic number instead of atomic mass. by arranging the elements into horizontal periods. by arranging the elements into vertical groups.”

The molarity of 8 grams of an aqueous solution of sodium hydroxide in 2 liters of solution is what?

Answers

Answer: 0.125

Explanation:

8g divided by 39.997. Then divide that answer by 2.

Answer:

0.1 M

Explanation:

What are some of the Properties of Liquids.

Answers

Answer:

Liquids take on the shape of their container. The liquid state of matter is an intermediate phase between solid and gas. Like the particles of a solid, particles in a liquid are subject to intermolecular attraction; however, liquid particles have more space between them, so they are not fixed in position.

Explanation:

I need help with 2, 3, and 4 please help i will give the brainliest

Answers

Answer:

2=2.28*10^5

3=3.98*10^3

4=5.76*10^3

A student wants to find the volume of a rock. the student starts with 25ml of water in their graduated cylinder that water level rises to 37ml. what is the volume of the rock?

Answers

Answer:

12 ml

Explanation:

the answer will be calculated by subtracting 37 ml from 25 ml so ,

37 - 25

= 12 ml

Which element has a greater atomic radius Mg or Cl?

Answers

the answer is Cl (chlorine)

what kind of bond is between a halogen and an alkali metal

Answers

Alkali metals tend to lose one electron and form ions with a single positive charge. They form ionic compounds (salts) in reaction with the halogens (alkali halides).

It’s an ionic bond because Alkali metals tend to lose one electron and form ions with a single positive charge

Assume that an object has been placed in the pan of a triple beam balance. The
scales of the balance are shown below. What is the mass of the object?

Answers

Answer:

190.4 g

Explanation:

To obtain the mass of the object, we must be able to obtain the reading of the triple beam balance.

Thus, the reading of the balance can be obtained by simply adding the various values as indicated by the pointer in each scale.

This can be obtained as follow:

Scale 1 = 90 g

Scale 2 = 100 g

Scale 3 = 0.4 g

Reading of the balance = Scale 1 + Scale 2 + Scale 3

Reading of the balance = 90 + 100 + 0.4

Reading of the balance = 190.4 g

Thus, the mass of the object as indicated by the triple beam balance is 190.4 g.

Which of the following is the correct name for N2S5?

Answers

Dinitrogen Pentasulfide

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Hughes purchased a new Lincoln Continental automobile from Al Greene Inc., an authorized new car dealership. On the day of the sale, Hughes made a cash down payment and signed a purchase contract and an application for the title certificate. The understanding was that Hughes would take immediate possession of the car and return in a few days for new-car preparation and the installation of a CB radio. On the way home from the dealer, Hughes wrecked the car. The certificate of title had not yet been issued by the state. The buyer, Hughes, claimed that title had not yet passed because the title certificate had not yet been issued. Who must bear the loss? [Hughes v. Al Greene, Inc., 418 N.E.2d 1355 (Ohio) ] which of the following best describes compounds.A. They can only be separated chemically b. they are always liquid at room temperature c. they contain the atoms of just one element d. they have the same properties as their elements Plants release oxygen into theatmosphere by...A. Splitting apart water moleculesB. Splitting apart carbon dioxideC. Attaching water togetherD. Attaching oxygen together Which of these factors would help the environment?a. Betty drinks only bottled water instead of soda.b. Greg changes all of the light bulbs in the office to energy efficient bulbs.c. John keeps his off topic conversations down to 10 minutes a day.d. Doug turns the air conditioning down to cool the office during the hot summer months.Please select the best alswer from the choices providedABD Which central principle of the US government is expressed in this excerpt?A) The government is granted its power by the people.B) There must be separation between religion and government.C) The government is granted its power by the Constitution.D) There must be separation between the powers of government. What was the economic situation in Britain after the French and Indian War? 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