1. When _____
are added or removed from an atom, _____
is formed

Answers

Answer 1

Answer:

1.) protons or electrons 2.) ion

Explanation:


Related Questions

help me i mark brain thing

Answers

Answer:

Becuase they can go through mountains and hills, they curve of of those.

Calculate the pH of the solutions with the following [OH-].

Answers

(2,4)distance graph

PLEASE HELP "Which of the following substances would have the lower concentration of hydrogen ions ?"

Answers

The lower the pH, the greater the concentration of hydrogen ions (this is one of the definitions of an acid: a substance that increases the hydrogen ion concentration in water). So the answer here would be the one denoting the highest pH value, since that would indicate the smallest concentration of hydrogen ions.

That would be the substance with a pH of 11.2. Thus, the second answer choice here would be correct.

What term is used to define when a substance reacts quickly with oxygen to produce light and heat?

A. rusting
B. sublimation
C. precipitation
D. burning

Answers

Answer:

I think it's a

Explanation:

not sure hssjkskaakakskksskksqoqkakskzksjsj

Answer: The answer is, D) Burning.

Explanation: Some moderator removed my last answer because someone reported it.

Covert 50oC to k
(I’ll mark you as brainlister)

Answers

Answer:

323 K

Explanation:

To convert Celcius to kelvin first you need to remember this equation:

C + 273 = K (K = kelvin and C = celsius)

Next, you substitute with what you have given:

50 + 273 = K

Solve the equation by adding 50 and 273

k = 323

After a skydiver deploys
his parachute, his rate of
speed decreases.

Answers

Answer:

As a skydiver falls, he accelerates downwards, gaining speed with each second. The increase in speed is accompanied by an increase in air resistance (as observed in the animation below). This force of air resistance counters the force of gravity. As the skydiver falls faster and faster, the amount of air resistance increases more and more until it approaches the magnitude of the force of gravity. Once the force of air resistance is as large as the force of gravity, a balance of forces is attained and the skydiver no longer accelerates. The skydiver is said to have reached a terminal velocity.

Explain why a climax community is not always a forest.

Answers

They are all in forest climax means forest

Hydrogen bonding in water molecules results in all of the following properties except?

Answers

Answer:

Transparent Color

Explanation:

Hydrogen bonds here in water provides a lot of benefits which includes cohesion, releasing heat when forming, Also because of the fact that water molecules are polar, they form hydrogen molecules and give water some characteristics which ranges from high boiling point, relative gravity, adhesion ad also cohesion. It is also known that oxygen atom attracts the electrons more strongly than the hydrogen.

   A transparent colour falls in no place and do not really have any correlation in oxygen and hydrogen relationship.

The presence of hydrogen bonds in molecules affects the bulk properties of the molecules.

Though the question is incomplete but I will try to help you the much I can. hydrogen bonding is said to occur in molecules where hydrogen is bonded to a highly electronegative atom such as nitrogen, oxygen and fluorine.

The presence of hydrogen bonding in molecules affects its bulk properties such as melting and boiling points, density and surface tension.

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what is the mass of [tex]Fe^{2+}[/tex] in 5 tablets of iron if the number of moles of [tex]Fe^{2+}[/tex] is 4.2225 x [tex]10^{-4}[/tex] mol.
[ Ar = Fe, 56 ]

Answers

Answer:

Approximately [tex]0.11823\; \rm g[/tex] in total for the five tablets.

(Approximately [tex]2.3646 \times 10^{-2}\; \rm g[/tex] per tablet.)

Explanation:

The relative atomic mass of an element is the ratio between:

the mass of one atom of this element, and the mass of one-twelfth of a carbon-[tex]12[/tex] atom.

The definition of moles ensures that the relative atomic mass of an element is approximately numerically equal to the mass (measured in grams) of one mole of the atoms of this element.

The question states that the relative atomic mass [tex]A_{\rm r}[/tex] of iron is [tex]56[/tex]. In other words, the mass of one mole of iron [tex]\rm Fe[/tex] atoms would be approximately [tex]56\; \rm g[/tex].

The question is asking for the mass of some amount of [tex]\rm Fe^{2+}[/tex] ions. Each [tex]\rm Fe^{2+}\![/tex] ion contains two fewer electrons than a neutral [tex]\rm Fe[/tex] atom. Hence, [tex]4.2225 \times 10^{4}\; \rm mol[/tex] of [tex]\rm Fe^{2+} \![/tex] ions might be lighter than the same number of [tex]\rm Fe \![/tex] atoms by a very small extent: The mass of one mole of electrons is approximately [tex]5 \times 10^{-4}\; \rm g[/tex], much smaller than the mass of the same number of [tex]\!\rm Fe[/tex] atoms (approximately [tex]56\; \rm g[/tex].)

Estimate the mass of these [tex]4.2225 \times 10^{4}\; \rm mol[/tex] of [tex]\rm Fe^{2+}[/tex] ions using the mass of the same number of [tex]\rm Fe[/tex] atoms:

[tex]\begin{aligned}&m({\rm Fe^{2+}}) \\ &\approx m({\rm Fe}) \\ &\approx 4.2225 \times 10^{-4}\; \rm mol \\ &\quad\quad \times 56\; \rm g \cdot mol^{-1} \\ &\approx 2.3646 \times 10^{-2}\; \rm g \end{aligned}[/tex].

Five of these tablets would contain approximately [tex]5 \times 2.3646 \times 10^{-2}\; \rm g \approx 0.11823\; \rm g[/tex] of [tex]\rm Fe^{2+}[/tex] ions.


State TWO ways in which stress could impact negatively on student's
performance at College or university.​

Answers

Two ways that stress could negatively impact a students performance is by causing them to procrastinate. When you're stressed, you tend to keep putting things off because you "just can't deal with it" at the moment. This could cause the student to turn in their assignments late (or not at all) and cause their grades to drop. Additionally, when you're stressed, it's harder to fall asleep, and once you are, you don't sleep as well. Sleep deprivation can greatly affect a student's in class performance by causing them to fall asleep in class, or not pay attention as well.

What color is an orange?

Answers

Answer:

orange

Explanation:

7
Why might living in a high-pollution area have a negative effect on a person's
thyroid?
I

Answers

Answer: since the thyroid produces hormones, the chemicals made by our bodies. Living where there is a lot of pollution would expose a person to many other chemicals -- gas fumes, contaminants in food and water, and so on. I hope this helped!!

Which branch of chemistry would study how pollution effects marine life?
biochemistry
physical chemistry
materials chemistry
environmental chemistry

Answers

Answer: (D) environmental chemistry

Explanation:

The environmental chemistry is branch of chemistry would study how pollution effects marine life. option D is correct.

What is  environmental chemistry?

Environmental chemistry is the study of the biochemical and chemical processes that occur in natural places like in forest, water bodies in air in soil and related to animals too.

Environmental chemistry is wide range of studies than air, water, soil, and chemicals. This also gives the brief account about the marine life with studying the life cycle of marine animals and plants too.

Therefore, environmental chemistry is branch of chemistry would study how pollution effects marine life. option D is correct.

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Hydrogen and Oxygen combine to form water. In this chemical reaction, who represents the reactions(s)

A. water
B. oxygen and water
C.hydrogen and water
D. hydrogen and oxygen

Answers

I think it is D but I’m not sure

Elizabeth collects different types of rocks whenever she goes on vacation. She has rocks that contain shiny crystals, grainy rocks, and rocks that are smooth. These rocks are formed? by different processes. Which of the following is NOT a process by which rocks are formed?

A. freezing of sediments.

B. compaction of sediments.

C. heat and pressure within the Earth

D. cooling of magma at Earth's surface​

Answers

Answer:

It should be A. I've never heard of freezing of sediments

If Hydrochloric Acid and Calcium Carbonate were combined would the reaction that occurs be endothermic or exothermic? Why?

Answers

Answer:

endothermic

Explanation:

more energy is being released and heat is being required to do the process.

If peanut butter wasn't called peanut butter.. what would it be called?

Answers

Answer:

I have no idea

Explanation:

Please help ASAP I’ll mark you as brainlister

Answers

Answer:

2

Explanation:

The balanced chemical equation for this reaction is:

2Na + K2S → 2K + Na2S

Meaning the coefficient for potassium (K) is 2.

Answer:

2 / 1 => 2 / 1

The sun is located at 1 astronomical unit from Earth. How far is the next closest star to Earth?

A. It is about twice as far from earth as the sun.
B. It is about 100 times as far from earth as the sun.
C. It is about the same distance from Earth as the
sun.
D. It is many thousands of times as far from the Earth as the sun.

Answers

answer:

d

Explanation:

sun 109 million miles

2 star trillion of miles

HELPP asap I’ll mark you as brainlister!!!!!!

Answers

3.50 atm

Total pressure is just the sum of partial pressures. If you have 2.07 atm of pressure in the cylinder and then add 1.43 atm, you just add the two pressure together to get the total.

6.
Why are estuaries home to diverse marine life not found elsewhere?
is hrimming with

Answers

Answer:

Estuaries are bodies of water where rivers meet the sea or a large lake. Rivers spread out and slow when they meet the sea, creating unique conditions that are not found elsewhere. They provide homes for diverse wildlife, including popular fish species.

A student placed a solid in a liquid, which produced the results shown in the following diagram.
solid: 20°C
OOO
gas bubbles
liquid: 20°C
1
2
Which of the following MOST likely took place?
A. a chemical reaction
chemical
o
O B. a phase change
C. a nuclear reaction
D. a destruction of mass

Answers

B.) a phase change. I think but for sure it’s not C-

The most likely to take place when a solid is placed in a liquid at room temperature ( i.e. 20°C ) is ; ( A )  A chemical reaction

Although your question lacks the required diagram a general answer is provided within the scope of your question

When a solid at 20°C is placed inside a liquid also at 20°C  in the laboratory the emergence of gas bubbles shows that there has been a chemical change between the solid and liquid reactant ( i.e. a chemical reaction has taken place ).

Hence we can conclude that what is most likely to have taken place in this situation is a Chemical reaction.

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Calculate the standard potential, ∘, for this reaction from its equilibrium constant at 298 K. X(s)+Y3+(aq)↽−−⇀X3+(aq)+Y(s)=6.90×10−8 X ( s ) + Y 3 + ( aq ) ↽ − − ⇀ X 3 + ( aq ) + Y ( s ) K = 6.90 × 10 − 8

Answers

Answer: The standard potential is  -0.141 V

Explanation:

To calculate the Gibbs free energy for given value of equilibrium constant we use the relation:

[tex]\Delta G=-RTlnK[/tex]

where,

= standard Gibbs free energy = ?

R = Gas constant = 8.314 J/Kmol

T = temperature = 298 K

K = equilibrium constant =

Putting values in above equation, we get:

[tex]\Delta G=40853J[/tex]

Also [tex]\Delta G=-nFE^0[/tex]

where n = no of electrons gained or lost = 3

F = Faradays constant = 96500 C

[tex]E^0[/tex] = standard potential = ?

[tex]40853=3\times 96500\times E^0[/tex]

[tex]E^0=-0.141V[/tex]

Thus the standard potential is -0.141 V

2N2 + 502 --> 2N205
Based on the above reaction, if 7 moles of Ny react completely, how many moles of Oz must also react?
ASAP LOOK AT PICTURE

Answers

Answer:

wait are you talking about the bottom question??

What is the mass in grams of 4.8 moles of Calcium Hydroxide?

Answers

Answer:

355.2 grams

Explanation:

m = M×n= (40 + 2(16+1))×4.8= 355.2 (g)

The answer is 74.093 g/mol

What is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K), is heated from 25°C to 15°C?

A. 21 J
B. 0.21 J
C. 210 J
D. It is impossible to calculate without knowing the mass of the iceberg

Answers

Answer:

A. 21 J

Explanation:

Your temperature change is 10 degrees Celsius, or 10 Kelvin, it makes no difference either way.

Cp = 2.06 J/g•K

Multiply by the temperature change to just get J/g

2.06 J/g•K • 10 K = 20.6 J/g ≈ 21 J/g

21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C. So, the correct option is A.

What is Heat?

Heat is defined as the energy that is transferred from one body to another as a result of a difference in temperature, when two bodies at different temperatures are brought together, the energy transferred is that of the hotter body which flows towards the colder body.

In this case, according to the equation for the calculation of the heat during a heating process

[tex]Q= mC (T_f- T_i)[/tex]

It is possible to calculate mass per gram of ice by dividing both sides by removing m from the equation, we plug in the given specific heat and final and initial temperatures to get:

[tex]Q= 2.06 \frac{J}{g degree C} [-15 Degree C- (-25 Degree C][/tex]

[tex]Q= 20.6\frac{J}{g}[/tex] which is equals to 21° C

21 J is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 J/(g·K) which is heated from 25°C to 15°C.

Therefore, the correct option is A.

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As Which is a case of drug abuse?

A.

taking an analgesic whenever you have a headache, no matter how mild

B.

taking double the dosage, by accident, of a medicine that your doctor has prescribed

C.

taking a tranquilizer every night when the label warns not to take it on consecutive nightspirin is a widely used drug. What kind of medicine is it?

Answers

Answer :I think it’s c

Hope this helps!
The answer is C. Hope this helps

Please help I want the answer

Answers

A) Since both are carbons with the only difference in the number of neutrons,

They are called Isotopes

B) Carbon - 12 has 6 protons and 6 neutrons, while Carbon-13 has 6 protons and 7 neutrons,

Therefore Carbon-12 and Carbon-13 have the same number of protons

C) Carbon - 12 has 6 protons and 6 neutrons, while Carbon-13 has 6 protons and 7 neutrons,

Therefore Carbon-12 and Carbon-13 has different numbers of neutrons

D) Sorry i don't know any uses of Carbon-12 and Carbon-13, you might have to research to get it.

E or F) Sodium 23 has 12 neutrons and 11 electrons, because its mass number 23, atomic number is 11 and since protons and electrons count is same, the number of neutrons = mass number - atomic number = 23 - 11 = 12 neutrons

Happy to help :)

If you need any more help, feel free to ask

Given 2Na + Cl2=2NaCl, what is the excess reactant? What is the limiting reactant?

Answers

Answer: The limiting reactant is Na

Explanation:

A beaker contains a sample of water with a mass of 325 grams. The water in the beaker
is boiled and weighed again after it cools. The new mass of the water is 305 grams. In
this example of the conservation of matter in physical changes,
A. the mass is less after it cools because water has less mass as a gas.
B. the mass of the water was 305 grams and the mass of the water vapor was 20 grams.
C. the process of boiling destroyed 20 grams of the water and left 305 grams of water.
D. the heat energy created by boiling water makes up the rest of the mass.

Answers

Answer: a

Explanation:

Bc I just did it and yeah

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