Goal: Atoms are composed of electrons, protons, and neutrons. It is the difference in the numbers of protons in the atoms that determine the different elements. You can determine the composition of an atom of any element from its atomic number and its mass number.

Answers

Answer 1

The given statement is correct. What atom we are looking at is determined by the number of protons.

How would you calculate an atom's or element's proton count?

The atomic number of an element is equal to the number of protons in an atom. Use oxygen as an example. The periodic table states that oxygen has an atomic number of eight. The element's symbol is placed above the atomic number.

How can the abundance of protons within an atom be determined? How can the abundance of neutrons in such an atom be determined?

A neutral atom has the same number of protons and electrons as protons. The total of the protons and neutrons with in atom's nucleus determines its mass, which is denoted by the letter M. The number of neutrons is equivalent to the discrepancy between the atomic number and the mass number of the atom (M) (Z).

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Related Questions

HELP PLS IL GIVE YOU BRAINLIEST PLS IT BY TODAY AT 7 PLS HELP

Answers

Answer:

Calm down is this what you need?

Answer:

calm down, what kind of container and things do you need?

Explanation:

Oxalic Acid, a compound found in plants and vegetables such as rhubarb, has a mass percent composition of 26.7% C, 2.24% H, and 71.1% O. Oxalic acid can interfere with respiration and cause kidney or bladder stones. If a large quantity of rhubarb leaves is ingested, the oxalic acid can be toxic. The lethal dose (LD50) in rats for oxalic acid is 375 mg/kg. Rhubarb leaves contain about 0.5% by mass of oxalic acid. (Show your work, using the insert equation tool :) What is the empirical formula of oxalic acid

Answers

Answer:

HCO₂

Explanation:

From the information given:

The mass of the elements are:

Carbon C = 26.7 g;     Hydrogen H = 2.24 g     Oxygen O = 71.1 g

To determine the empirical formula;

First thing is to find the numbers of moles of each atom.

For Carbon:

[tex]=26.7 \ g\times \dfrac{1 \ mol }{12.01 \ g} \\ \\ =2.22 \ mol \ of \ Carbon[/tex]

For Hydrogen:

[tex]=2.24 \ g\times \dfrac{1 \ mol }{1.008 \ g} \\ \\ =2.22 \ mol \ of \ Hydrogen[/tex]

For Oxygen:

[tex]=71.1 \ g\times \dfrac{1 \ mol }{1.008 \ g} \\ \\ =4.44 \ mol \ of \ oxygen[/tex]

Now; we use the smallest no of moles to divide the respective moles from above.

For carbon:

[tex]\dfrac{2.22 \ mol \ of \ carbon}{2.22} =1 \ mol \ of \ carbon[/tex]

For Hydrogen:

[tex]\dfrac{2.22 \ mol \ of \ carbon}{2.22} =1 \ mol \ of \ hydrogen[/tex]

For Oxygen:

[tex]\dfrac{4.44 \ mol \ of \ Oxygen}{2.22} =2 \ mol \ of \ oxygen[/tex]

Thus, the empirical formula is HCO₂

Was rays birthday lit

Answers

Answer:

Yes.

Explanation:

Yes.

Answer:10-1707

Explanation:

7th grade science lol help​

Answers

Answer:

The process you are referrring to is erosion.

Explanation:

Weathering would be the breaking down of rock/other land debris. Its more active counterpart would be erosion, wherein the process transports the bits of rock and minerals away. Hope it helps!

what happens to particles when they are heated?
A. STop moving
B.Slow down and compress
C.Move closer together and speed up
D.Speed up and spread out​

Answers

Answer:

D. Speed up and spread out

Data Table 3: Polystyrene Test Tube, 12x75mm
Volume of water at room temperature (V1 in ml)
Volume of gas in polystyrene tube at boil (V2 in mL)
Temperature of gas at boil inside polystyrene tube (°C)
Volume of gas in polystyrenetube at room temperature (V3 in mL)
Temperature of gas at room temperature (°C)


Need help with data table 3: polystyrene test tube, 12x75mm

Answers

Answer:

Experiment 8 E Data Table 3 fl Data Table 4 fl Data Table 5 fl Data Table 6 Data Table 3: Polystyrene Test Tube, 12x75mm Volume of water at room temperature (V1 in mL) Volume of gas in polystyrene tube at boil (V2 in mL) Temperature of gas at boil inside polystyrene tube (°C) Volume of gas in polystyrenetube at room temperature (V3 in mL) Temperature of gas.

Explanation:

Hope this helps

Mark as Brainliest please

Which among the following is not required in the synthesis of fatty acids.
A). Acetyl-CoA
B). Biotin
C). Carbon iv oxide
D). NADH

Answers

Answer:

D). NADH

Explanation:

C12H26+Oxygen=12CO2+water
calculate the mass of one mole of the liquid alkane C12H26.​

Answers

Answer:

170.38g is the mass of 1 mole of C₁₂H₂₆

Explanation:

To solve this question we must find the molar mass of the alkane C₁₂H₂₆. The molar mass is defined as the mass of one mole of a substance.

In 1 mole of C₁₂H₂₆ we have 12  moles of Carbon and 26 moles of Hydrogen. With the periodic table of elements we can know the molar mass of 1 mole of Carbon and 1 mole of hydrogen, and, thus, the molar mass of the alkane (Molar mass C = 12.01g/mol, H = 1.01g/mol)

Molar mass C₁₂H₂₆:

12C = 12*12.01g/mol = 144.12g/mol

26H = 26*1.01g/mol = 26.26g/mol

144.12g/mol + 26.26g/mol =

170.38g is the mass of 1 mole of C₁₂H₂₆

Which part of Earth absorbs the most sunlight?

oceans
soil
atmosphere
rivers and lakes

Answers

The oceans absorb the most sunlight from the options that we have here.

What is the part?

Seventy-one percent or more of the surface of the Earth is covered by the oceans. The result is that they get a lot of sunshine. The upper layers of the ocean absorb a large amount of the incoming solar energy, which enters the ocean waters.

Solar radiation is efficiently absorbed by water, especially in the visible light spectrum. The ocean heats the water as a result of absorbing sunshine. The oceans' ability to absorb solar energy is vital for driving a variety of marine phenomena, including currents, circulation patterns, and temperature distribution, as well as managing Earth's climate.

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Answer:

The answer is A. Oceans.

Explanation:

I did the test.

When you work out your cells need

Answers

Answer:

Waterrrr

Explanation:

H2O

Answer:

Muscle contraction

Explanation:

According to the new study, exercise improves muscle health by renewing its cellular powerhouse: the mitochondria. Mitochondria are crucial to the good functioning of our bodies, as well as to our overall health and longevity. These tiny parts of the cell turn the food we eat into energy.

Which factors were affected by the breakup of the supercontinent Pangaea? Check all that apply.

the shape of Earth’s orbit
global wind patterns
ocean currents
the tilt of Earth’s axis
global climates

Answers

Answer:

Global wind patterns

Ocean currents

Global climates

Explanation:

Edge2021 correct

The factors that were affected by the breakup of the supercontinent Pangaea include global wind patterns, ocean currents, and global climates.

What was Pangea?

The Pangea was a super-landmass that originally gave rise to all continents on the Earth planet.

According to the theory of continental drift, the Pangea break up millions of years ago to generate the continents.

This theory (continental drift) has been replaced by the tectonic plate model, but the idea of Pangea has still support in the scientific community.

In conclusion, the factors that were affected by the breakup of the supercontinent Pangaea include global wind patterns, ocean currents, and global climates.

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balance the following equation ​

Answers

I just know that much if my answer is helpful please mark it brainlist

plz, help me it's urgent

Answers

Answer:

Explanation:

A is solid, b is melting, c is freezing, d is liquid, e is evaporating, g is gas, and f is condensation.

Hello Mikaela!

Let's start from the top, letter G. Letter G should be gas. Letter F should be condensation. Letter E should be evaporation. Letter D should be liquid. Letter C should be freezing. Letter B should be melting. And letter A should be solid.

I really hope this helps!!

Calculate the pH of a solution containing 25 g of barium hydroxide (171.34 mel) dissolved in 250 mL of
solution.

Answers

Answer:

14

Explanation:

Step 1: Calculate the moles corresponding to 25 g of Ba(OH)₂

The molar mass of Ba(OH)₂ is 171.34 g/mol.

25 g × 1 mol/171.34 g = 0.15 mol

Step 2: Calculate the molar concentration of Ba(OH)₂

Molarity is equal to the moles of solute divided by the liters of solution.

[Ba(OH)₂] = 0.15 mol/0.250 L = 0.60 M

Step 3: Calculate the molar concentration of OH⁻

Ba(OH)₂ is a strong base according to the following equation.

Ba(OH)₂ ⇒ Ba²⁺ + 2 OH⁻

The molar ratio of Ba(OH)₂ to OH⁻ is 1:2. The molar concentration of OH⁻ is 2/1 × 0.60 M = 1.2 M.

Step 4: Calculate the concentration of H⁺

We will use the ionic product of water expression.

Kw = 1.0 × 10⁻¹⁴ = [H⁺] × [OH⁻]

[H⁺] = 1.0 × 10⁻¹⁴/[OH⁻] = 1.0 × 10⁻¹⁴/1.2 = 8.3 × 10⁻¹⁵ M

Step 5: Calculate the pH of the solution

We will use the definition of pH.

pH = -log [H⁺] = -log 8.3 × 10⁻¹⁵ = 14

Polyvinyl chloride (PVC) is one of the most commercially important polymers. PVC is made by addition polymerization of vinyl chloride ( C2H3Cl ). Vinyl chloride is synthesized from ethylene ( C2H4 ) in a two-step process involving the following equilibria:
Equilibrium 1: C2H4(g)+Cl2(g)⇌C2H4Cl2(g)
Equilibrium 2: C2H4Cl2(g)⇌C2H3Cl(g)+HCl(g)
Use bond energies to estimate the enthalpy change, ΔrH for Equilibrium 1.

Polyvinyl chloride (PVC) is one of the most commercially important polymers. PVC is made by addition polymerization of vinyl chloride ( C2H3Cl ). Vinyl chloride is synthesized from ethylene ( C2H4 ) in a two-step process involving the following equilibria:
Equilibrium 1: C2H4(g)+Cl2(g)⇌C2H4Cl2(g)
Equilibrium 2: C2H4Cl2(g)⇌C2H3Cl(g)+HCl(g)

Part B
Use bond energies to estimate the enthalpy change, ΔrH for Equilibrium 1.
Part C
Use bond energies to estimate the enthalpy change, ΔrH , for Equilibrium 2.

Answers

Answer:

To estimate the enthalpy change for Equilibrium 1, we need to calculate the bond energies for the reactants and products of the reaction and use them to determine the change in enthalpy.

The bond energies for the reactants of Equilibrium 1 are:

C2H4(g): 412 kJ/mol

Cl2(g): 243 kJ/mol

The bond energies for the products of Equilibrium 1 are:

C2H4Cl2(g): 575 kJ/mol

We can use these bond energies to calculate the enthalpy change for Equilibrium 1 as follows:

ΔrH = [C2H4Cl2(g)] - ([C2H4(g)] + [Cl2(g)])

ΔrH = 575 kJ/mol - (412 kJ/mol + 243 kJ/mol)

ΔrH = 120 kJ/mol

Therefore, the enthalpy change for Equilibrium 1 is approximately 120 kJ/mol.

For Equilibrium 2, the bond energies for the reactants are:

C2H4Cl2(g): 575 kJ/mol

The bond energies for the products are:

C2H3Cl(g): 328 kJ/mol

HCl(g): 432 kJ/mol

We can use these bond energies to calculate the enthalpy change for Equilibrium 2 as follows:

ΔrH = ([C2H3Cl(g)] + [HCl(g)]) - [C2H4Cl2(g)]

ΔrH = (328 kJ/mol + 432 kJ/mol) - 575 kJ/mol

ΔrH = -215 kJ/mol

Therefore, the enthalpy change for Equilibrium 2 is approximately -215 kJ/mol.

Which months have an average high of 47 degrees Fahrenheit

Answers

Answer:

Explanation:

july

Select the correct structure that
corresponds to the name.
3-bromo-6-methyl-4-octene
CHE
A
Br
B.
CH3CH2CHBrCH = CHCH(CH3)CH2CH3
C. both

Someone please help

Answers

Answer:

b

Explanation:

one clue is the double bond at 4 carbon c=c

The correct structure that corresponds to the name.

3-bromo-6-methyl-4-octene is   [tex]$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHBrCH}=\mathrm{CHCH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}$[/tex] .

What is 3-bromo-6-methyl-4-octene?

The molecule in which bromine is attached with C-3 carbon and double present at C-4 carbon containing total number of 8 carbon atom can be considered as 3-bromo-6-methyl-4-octene.

What is structure?

A chemist specifies the molecular geometry and, where possible and required, the electronic structure of such given molecule as well as other solid during a chemical structure determination.

It can be seen that in molecule [tex]$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHBrCH}=\mathrm{CHCH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}$[/tex] bromine is attached with C-3 carbona and double bond exist at C-4 carbon. the total number of carbon atom is 8.

therefore, the structure of the compound will be [tex]$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHBrCH}=\mathrm{CHCH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CH}_{3}$[/tex].

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How many molecules of H20 are present in 7.30 g of water?

Answers

Answer:

2.44×10²³ molecules

Explanation:

From the question given above, the following data were obtained:

Mass of H₂O = 7.30 g

Number of molecules of H₂O =?

From Avogadro's hypothesis:

1 mole of H₂O = 6.02×10²³ molecules

1 mole of H₂O = (2×1) + 16

= 2 + 16

= 18 g

Thus,

18 g of H₂O = 6.02×10²³ molecules

Finally, we shall determine the number of molecules present in 7.3 g of H₂O. This can be obtained as follow:

From Avogadro's hypothesis:

18 g of H₂O = 6.02×10²³ molecules

Therefore,

7.3 g of H₂O = 7.3 × 6.02×10²³ / 18

7.3 g of H₂O = 2.44×10²³ molecules

Thus, 7.3 g of H₂O contains 2.44×10²³ molecules

At which point on the roller coaster will the car have the greatest amount of Kinetic energy?

Answers

I’m going to say the answer is most likely X because memetic energy is energy being used at that moment. Because the coaster is going fastest at X we can assume that the answer is X

When putting hydrogen peroxide on an open wound, the wound begins to bubble and foam. Has a chemical reaction occurred? Explain your answer.

Answers

Answer:

Bubbling can indicate a chemical reaction

Explanation:

Chemical reaction takes place with the beginning of bubbles and foam when hydrogen peroxide is put onto an open wound. This compound does not only heal the wound but also damages the body as it also kills the nearby healthy cells.

What is a chemical reaction?

Chemical reaction is a process which leads to chemical transformation of a chemical substance into another.

Hydrogen peroxide bubbles when it comes into contact with an enzyme called catalase. Most of the cells in the body contain catalase enzyme, so whenever the tissue is damaged, the enzyme catalase is released from the cell and it becomes available to react with the peroxide ion.

Hydrogen peroxide applied on a cut produces a white, fizzling foam which is actually a sign that the solution is killing the bacteria as well as the healthy cells around it.

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The stem of a plant is made of several types of tissue that work together.
Which type of structure is the stem of a plant?
a: cell
b: tissue
c: organ
d: organ system

Answers

answer is tissue - :)

photoluminescent green carbon nanodots from food-waste-derived sources: large-scale synthesis, properties, and biomedical applications

Answers

Using simple and environmentally friendly synthesis approach, we can produce approximately 120 g of G-dots per 100 kg of food waste.

Because of the abundance of oxygen-containing functional groups on their surface, G-dots are highly soluble in water. Because of similar quantum effects and emission traps on the surfaces, the narrow band of photoluminescence emission (400-470 nm) confirms that the size of the G-dots (∼4 nm) is small. G-dots have excellent photostability; their photoluminescence intensity decreases slowly (∼8%) after 10 days of continuous excitation with a Xe lamp. We performed a cell viability assay to evaluate the effect of cytotoxicity by introducing G-dots into cells such as Chinese hamster ovary cells (CHO-K1), mouse muscle cells, and African green monkey kidney cells (COS-7) for 24 hours.

These G-dots are excellent probes for in vitro bioimaging due to their high photostability and low cytotoxicity. Furthermore, byproducts of G-dot synthesis from large food-waste derived sources aided in the growth and development of seedlings germinated on 3DW-supplemented gauze. G-dots hold great promise in a variety of fields, including biomedical imaging, solution state optoelectronics, and plant seed germination and/or growth, due to the advantages of green synthesis, high aqueous stability, high photostability, and low cytotoxicity.

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PLEASE HELP ASAP
A sample of a gas has a volume V1 = 3L at a temperature T1 = 290K. Determine V2 when the temperature is T2
= 700K, while the pressure remains constant.
a.- 7.00L
b.- 7.24L
c.-2.74L​

Answers

I think the answer is b

How do you decrease the amount of energy storage molecules there are in an ecosystem?
a) increase sunlight
b) decrease sunlight
c) burn dead matter
d) bury dead matter
e) trap carbon dioxide

Answers

Decreasing sunlight will decrease the amount of energy storage molecules in an ecosystem.

What is Photosynthesis?

This is the process in which green plants manufacture food in the presence of sunlight. Primary producers are involved in this process of providing energy to the ecosystem.

This therefore means that a decrease in sunlight means a decrease in photosynthesis and energy production.

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The following concentrations are found in mixtures of ions in equilibrium with slightly soluble solids. From the concentrations given, calculate Ksp for each of the slightly soluble solids indicated:
(a) TlCl: [Tl+] = 1.21 Ã 10â2 M, [Clâ] = 1.2 Ã 10â2 M (b) Ce(IO3)4: [Ce4+] = 1.8 Ã 10â4 M, [IO3â] = 2.6 Ã 10â13 M (c) Gd2(SO4)3: [Gd3+] = 0.132 M, [SO42â] = 0.198 M (d) Ag2SO4: [Ag+] = 2.40 Ã 10â2 M, [SO42â] = 2.05 Ã 10â2 M (e) BaSO4: [Ba2+] = 0.500 M, [SO42â] = 4.6 Ã 10â8 M

Answers

Ksp for each of the slightly soluble solids

The solubility product constant, also known as the equilibrium constant, is the rate at which a solid material called the solute solubility in an aqueous solution. It is equal to the product of the ionic species on the product side multiplied by the coefficient of each ion with in chemical process. The maximum extent to which a solvent can dissolve in a solution is shown by the Ksp of each dissolution reaction, which is determined by the solubility rules. The max number of solute that can dissolve in a solvent at balance is defined as solubility. The state in which the concentration levels of products and reactants are continuous after the reaction has occurred is referred to as equilibrium.

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Two objects of equal mass have a force of gravity of 6 N between them. Imagine the mass of one is cut in half and the other stays the same, what is the force due to gravity?

Answers

Answer:

F' = 3 N

Explanation:

Given that,

Two objects of equal mass have a force of gravity of 6 N between them.

If the mass of one is cut in half and the other stays the same such that,

m₁' = m₁ and m₂' = (m₂/2)

We need to find the new force. The gravitational force between two objects is given by :

[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]

We have, F = 6 N

New force,

[tex]F'=G\dfrac{m_1'm_2'}{r^2}\\\\F'=\dfrac{Gm_1\times \dfrac{m_1}{2}}{r^2}\\\\=\dfrac{1}{2}\times \dfrac{Gm_1m_2}{r^2}\\\\F'=\dfrac{F}{2}\\\\F'=\dfrac{6}{2}\\\\F'=3\ N[/tex]

So, the new force becomes 3 N.

Plz help me I am timed!!

Answers

answer: i think it is C

How many moles of aspirin (C9H8O4) are contained in 3.13 g of aspirin?

Answers

Answer:

The correct answer is - 0.0173888 moles.

Explanation:

Aspirin,  C 9 H 8 O 4 , the atomic mass rounded to the nearest whole number, so: c- 12 h- 1 o - 16

now multiply these number by how many of each there are in the formula:

c - 12 x 9 = 108

h - 1 x 8 = 8

0 - 16 x 4 = 64

add these numbers up 108 + 8 + 64 = 180

aspirin has a molar mass of  

180.g mol ^− 1 . This means that one mole of aspirin will have a mass of 180 g .

You're dealing with 3.13 g  of aspirin, which will be equivalent to

3.13 g  /180g

=  0.0173888 moles aspirin

a lewis dot model of a simple hydrocarbon consists of what

Answers

Answer:

carbon and hydrogen

Explanation:

the carbon atoms join together to form the frame work of the compound and the hydrogen atoms attach to them in many different configurations

It is thought that when molten copper is cooled and solidified it can take in some oxygen from the air. This may slightly decrease the conductivity of the copper.
Suggest why the conductivity might be decreased.

Answers

The conductivity of copper can be decreased when it takes in oxygen from the air and forms copper oxide on the surface or when oxygen impurities are present in the material. Copper oxide is a poor conductor of electricity compared to pure copper, and the presence of oxygen impurities can disrupt the regular arrangement of copper atoms and hinder the flow of electrons, leading to a decrease in conductivity.

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The perimeter is 25cm32cm29cm can someone pleaze help me I need the answers like ASAP please help i need this done pls :) POSSIBLE POINTS 9In the text, the author questions whether or not the criminal justice system is doing what it was intended to do. What steps do you think we could take toensure that everyone has the same access to justice in the criminal justice system?In your response, provide a claim (answer the prompt with your opinion), example of your claim and analysis (why your example would supportyour claim). Tariffs increased sectionalism during what event?O Missouri CompromiseO Nullification CrisisO Emancipation ProclamationO Lincoln-Douglas debates ANSWER ASAP!!!!!!!!!!!!!!!!!!!!! Reflect (4, -4) over the x-axis. Then translate the result to the right 3 units. What are the coordinates of the final point? NO FILES PLEASE Which table shows ordered pairs that satisfy the function y = x + 1?X1202- 414B-202505Xy5-202.15Dxy-240 22 4 WHO KNOWS HOW TO DO A PRE-WRITE FOR WHAT MAKES AMERICA UNIQUE ? ASAP PLZZZ HELP MEE It is believed that GPA (grade point average, based on a four point scale) should have a positive linear relationship with ACT scores. The Excel output from regressing GPA on ACT scores using a data set of 8 randomly chosen students from a Big Ten university gives R Square = 0.5774 The interpretation of the coefficient of determination in this regression is that Is this correct? Pls help me If you spun the spinner 100 times, how many times do you predict that you would spin a number less than 5 on a spinner of 1-6 PLZ HELP i rlly need it i am not good a t algebra Evaluate the following expressions when x = 5. Show your work. Hint: Remember to use BEDMASMy question: 2x+3 Which sentence from the passage best supports the idea that the use of wood pulp made making paper a more attainable process? A. The materials required for making papyrus came from Cyperus Papyrus, a species of a flowering plant. B. The word "paper" is derived from the term "papyrus", a writing sheet used by ancient Egyptians. C. The use of wood pulp became a convenient method because of its abundance. D. The process of making wood pulp involved crushing logs of wood between large stones.PLZ HELP Why would you rather have hot cocoa than lemonade on a cold day? (The lesson is called heat transfer) Black holes cannot be seen without X-rays. If a telescope focuses on X-rays, we see a bright spot surrounding the black hole and a larger doughnut-shaped mass around that. The bright spot is gas, glowing at one million degrees. Any visible light it makes is absorbed by the doughnut-shaped mass of dust and gas around it. So we can only see it using X-rays. This is called a hidden or buried black hole.What does the photograph show to support the paragraph? A. a black hole seen in visible light without X-rays B. a buried black hole that looks like a doughnut C. million-degree gas inside a black hole D. visible light and dust outside a black The value of an autographed baseball card increased from $39 to $65 what is the percent increase in value of the baseball card? Help worth 10 points I need the whole area of the shape Tre or false?An alloy is a mixture of two or more metals. shown below are the statements and reasons to the proof. they are not in correct order. which of these is the most logical order for the statements