what is the number of protons in a neutral atom with 31 electrons and 38 neutrons?

Answers

Answer 1

31

I think. Protons and electrons share the same number as well as the atomic number.

Answer 2

Answer:

31 protons

Explanation:

Protons are positively charged and electrons are negatively charged so if it is a neutrally charged atom (which most are) the protons and electrons will be equal.


Related Questions

Choose the best answer.
What is the sum?
2/3+7/15
O 14/15
O1/2
O1 2/15
O3/5

Answers

Answer:

1 2/15

Explanation:

2/3 + 7/15 = 17/15 =1 2/15

write a balanced equation for the formation of co2 g from c s and o2 g

Answers

Answer:

C (s) + O2 (g) > CO2 (g)

That's what I got

How many moles of aluminum are needed to react completely with 2.1 moles of FeO? 2Al(s) + 3FeO(s) 3Fe(s) + Al2O3(s)

Answers

Answer:

1,4 mol

Explanation:

2 mol of Al reacts with 3 mol of FeO so for 2.1 mol of FeO you need 2 x 2.1 / 3 = 1.4mol

Rebekah finds that a solution of sugar in water has a volume of 1. 32 fl. Oz. How should she report this amount using the metric system? (1 fl. Oz. = 29. 6 mL) 0. 403 m 1. 40 qt 37. 5 g 39. 1 mL.

Answers

Rebekah reports the volume of sugar solution using metric system as 39.1 mL. Thus, option D is correct.

The metric system has been the measurement system introduced in 1790s. The system has mediated the units for the measurement of volume, mass, length.

The volume has been the space that has been occupied by matter. The volume can be denoted with SI unit L. However, the another accepted unit for volume has been mL.

Thus, the volume of sugar solution has been reported in mL.

The given sugar solution has volume of 1.32 fl. Oz

The volume in mL can be given as:

[tex]\rm 1\;fl\;Oz=29.6\;mL\\1.32\;fl\;Oz=1.32\;\times\;29.6\;mL\\1.32\;fl\;Oz=39.1\;mL[/tex]

The volume of the sugar solution reported by Rebekah on the metric scale has been 39.1 mL. Thus, option D is correct.

For more information about the metric system, refer to the link:

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what is the oxidation number of sulfur in the sulfate ion?

Answers

Answer:

+6

Explanation:

Deval drew the models of particles in a substance shown below. Which model best represents the particles in solid

Answers

Answer:

it would be the second one thank me later

Explanation:

The percent of attacks on the dark-colored mouse models is how many times greater than the percent of attacks on light-colored models

Answers

The number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse is four (4) times.

Let the percent of attacks on the dark-colored mouse be D.Let the percent of attacks on light-colored mouse be L.

Given the following data:

Light-colored mouse models = 20 percentDark-colored mouse models = 80 percent

To determine the number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse.

Therefore, we would simply divide the percentage for the dark-colored mouse by the percentage for the light-colored mouse as follows:

[tex]Number \;of\;times = \frac{D}{L}[/tex]

Substituting the given parameters into the formula, we have;

[tex]Number \;of\;times = \frac{80}{20}[/tex]

Number of times = 4 times.

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Two goldfish different parents.One fish has a split tail and the other does not.Why do the goldfish have tails with different shapes?

a.Each goldfish has a different tail shape because offspring from different parents will have different tail shapes.

b.Each goldfish has a different tail shape because they have different versions of the gene for tail shape that connect together to make different tail shapes.

c.The goldfish have different versions of the gene for tail shape.The genes are split inside one goldfish's tail but not inside the other's

The goldfish have different versions of the gene for tail shape,which instuct for different proteins that connect in different ways to make different tail shapes.

Answers

Answer:

A I believe is your best choice.

Explanation:

what is the Conversion of products into reactants

Answers

Answer:

In a chemical reaction, substances (elements and/or compounds) called reactants are changed into other substances (compounds and/or elements) called products. You can't change one element into another in a chemical reaction — that happens in nuclear reactions.

Explanation:

Explanation:

Thus, reactions in which products can be converted to reactant is called Reversible reaction.

A substance that takes the shape and volume of its container is in this phase is called a liquid

Answers

Answer:

liquid matter

Explanation:

what is an atom plz answer to get 10 points +brainliest

Answers

atom, smallest unit into which matter can be divided without the release of electrically charged particles. It also is the smallest unit of matter that has the characteristic properties of a chemical element. As such, the atom is the basic building block of chemistry.
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across

Conversion of units of temperature

Answers

Answer:

1. -5

2. 88.7

3. -23.3333

4. 126.5

5. 69.8

6. 30.61111

7. 118.4

8. 275

9. 94.82

10. 44.6

Explanation:

Answer:

here you go

Explanation:

1.-5

2.88.7

3.23.333

4.126.5

5.69.8

6.30.6111

7.118.4

8.275

9.94.82

10.44.6

In which one element replaces a similar element in a compound

Answers

Question:-

In which one element replaces a similar element in a compound?

Answer:-

A single-replacement reaction

Explanation:-

A single-replacement reaction is a reaction in which one element of a compound is replaced by another.

Why is eating animals to obtain energy considered exothermic

Answers

Its considered exothermic because it helps then stay cool or and hot

Question 12 of 35
Which two specialized structures allow amphibians to live on land?
O A. Gills
B. Lungs
C. Legs
D. Tail
SUBMIETI

Answers

Answer:

B and C

Explanation:

Most animals that live underwater have have gills and tails and vise versa hope this helps!

koukladina stop deleting my answers I'm trying to help people I'm not doing anything wrong stop it

Which description is not a property of an acid?
1. Slimy feel
2. Corrosive
3. Sour taste
4. Dissolves metals

Answers

Answer:

Slimy Feel

Explanation:

Acid usually doesn't have a Slimy Feel to it.

Acids don’t have a slimy feel

What mass of aluminum must react with 100 g of copper (ii) phosphate? (10g)

Answers

it would be 10g or 50g

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 4.42g of aluminum must react with 100 g of copper (ii) phosphate.

What is mole?

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

mole =given mass ÷ molar mass

2 Al + 3 Cu[tex]_3[/tex](PO[tex]_4[/tex])[tex]_2[/tex] → Al[tex]_2[/tex] (PO[tex]_4[/tex])[tex]_3[/tex]+ 3 Cu

moles of copper phosphate= 100 g/380.58

                                               =0.26 moles

3 moles of copper sulphate need 2 mole of Al

0.26 moles of copper sulphate need (2/3)×0.26

                                                         =0.17moles

mass of Al= 0.17×26

                  =4.42g

Therefore, 4.42g of aluminum must react with 100 g of copper (ii) phosphate.

To know more about mole, here:

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#SPJ2

what is the name of the compound whose formula is n,i,2o?

Answers

Answer:

Explanation:

Dinitrogen pentaoxide is a nitrogen oxide.

...

3.1Computed Properties.

Property Name Property Value Reference

Formal Charge 0 Computed by PubChem


Help this is due today!!!

Answers

Answer:

a) Fe

b) Fe

c) Fe

Explanation:

When using their stoichiometric ratios, in all of the the iron will run out before the oxygen, making the iron the limiting reactant.

A sample of ethanol (C2H6O) has a mass of 0. 2301 g. Complete combustion of this sample causes the temperature of a bomb calorimeter to increase by 1. 33°C. The calorimeter has a mass of 2. 000 kg and a specific heat of 2. 45 J/g•°C. What is the heat of combustion for this sample? kJ.

Answers

The heat of combustion of the sample is calculated to be  -1300 kJmol-1.

We know that energy is neither created nor destroyed but is converted from one form to another. The heat lost by the ethanol when it is burnt is equal to the heat gained by the calorimeter.

Heat gained by calorimeter =  2.×10^3 g ×  2. 45 Jg-1°C-1 × 1. 33°C

= 6.5 kJ

Number of moles of ethanol =  0. 2301 g/46 g/mol = 0.005 moles

Heat of combustion of the sample = -( 6.5/0.005 moles) = -1300 kJmol-1

Learn more: https://brainly.com/question/17638582

28) what is the number of oxygen atoms in the formula unit of Ca3(PO4)2?​

Answers

Answer:

4.816x10²⁴atoms

Explanation:

the number of moles of oxygen is 8

let x be number of oxygen atoms

recall that 1 mole=6.02x10^23 atoms

therefore, 8 moles =x

cross multiply

8 x 6.02 x 10^23 = x

x = 4.816 x 10²⁴atoms

Which of the following is true for the percentage yield of a reaction?

А. It is the combined yield from the excess reactant and the limiting reactant.

B. It is the calculated yield of the product based on stoichiometry alone.

C. It is calculated based on stoichiometry as well as experimentation.

D. It is the yield of the product from the limiting reactant alone.​

Answers

Answer:

It is always less than the theoretical yield

Explanation:

For many chemical reactions, the actual yield is usually less than the theoretical yield. This is due to possible loss in the process or inefficiency of the chemical reaction.

Difference between Laboratory Thermometer and Clinical Thermometer.​

Answers

Explanation:

Can you please mark me the brillantest?

The difference between a laboratory thermometer and a clinical thermometer is that a clinical thermometer is used to measure body temperature, however a laboratory thermometer is not used for purpose of measuring body temperature
The clinical thermometer can be titled while reading the temperature values whereas a laboratory thermometer needs to be kept upright.

The pH scale is used to tell if a substance
is an acid or base. Substances with a pH
of 7 are neutral. An acid is anything
below 7 and a base is anything above
7.What would a household cleaner with a
pH of 10 be considered on the pH scale?

Answers

Answer:

Explanation:

pH > 7   as 10 is more than 7

The cleaner is very corrosive.

It is a moderately basic. If it was 12 that would make it much more basic (100 times more basic).

How many Hydrogen atoms are required to satisfy Oxygen during bonding

Answers

Answer:

2 hydrogen atoms

Explanation:

I’m sure it’s two hydrogen atoms

At room temperature Bromine is a liquid and lodine is a solid, what can be inferred
about the intermolecular forces of these two elements?

Answers

Answer:

Explanation:

The intermolecular forces are stronger in Iodine, meaning that its molecules are stronger and can hold that solid structure at room temperature, where Bromine cannot due to its IMF's being weaker.

What is leukemia?
A. Cancer that affects the blood
B. Prostate cancer
C. Breast cancer
D. Lung cancer

Answers

Answer:

A: Cancer that affects the blood

information: Leukemia is a cancer of the early blood-forming cells. Most often, leukemia is a cancer of the white blood cells, but some leukemias start in other blood cell types.

3. Type: MT
Match the term to the correct definition
1. Homogeneous mixture
a. same throughout
2. Heterogeneous mixture
b. different throughout

Answers

Homogeneous mixture - same throughout

Heterogeneous mixture - different throughout

Answer:  Homogeneous Mixture : B(different throughout)

Heterogeneous Mixture : A(same throughout)

On the spectrum, which section has the longest wavelength and the shortest wavelength? (2 answers for this question)

Answers

Answer:

Radio waves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays are all types of electromagnetic radiation. Radio waves have the longest wavelength, and gamma rays have the shortest wavelength.Hope i help you

In which of the following reactions is chlorine (Cl) oxidized? Br2 2Cl⒠→ Cl2 2Br⒠Cl2 2e⒠→ 2Cl⒠2ClO3⒠12H → Cl2 6H2O 2Na Cl2 → 2NaCl.

Answers

The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.

In a reaction, the oxidation has been defined as the loss of electrons by the atom, while reduction has been depicted as the gain of electrons.

The loss of electrons imparts a positive charge to the atom, while the gain of electrons imparts a negative charge to the atom.

In the following reactions, the Cl has been given as:

[tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]

The chlorine has loses the electron and is converted to diatomic molecule. Thus, the Cl has been oxidized. The oxidation state of Cl has also been increased from -1 to 0.

[tex]\rm Cl_2\;+\;2\;e^-\;\rightarrow\;2\;Cl^-[/tex]

The chlorine gains 2 electrons in the reaction and has been reduced.

[tex]\rm 2\;ClO_3^-\;+\;12\;H^+\;\rightarrow\;Cl_2\;+6\;H_2O[/tex]

There has been no change in the oxidation state of chlorine. Thus, Cl has not been oxidized.

[tex]\rm 2\;Na\;+\;Cl_2\;\rightarrow\;2\;NaCl[/tex]

The chlorine gains electron and has been converted to the Cl ion. With the gain of electrons, Cl has been reduced.

The reaction in which Cl has been oxidized is [tex]\rm Br_2\;+\;2\;Cl^-\;\rightarrow\;Cl_2\;+\;2\;Br^-[/tex]. Thus, option A is correct.

For more information about oxidation, refer to the link:

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