Chemistry High School

calculate the number of atom of each element : ​

Calculate The Number Of Atom Of Each Element :

Answers

Answer 1

Answer:

P = 6

O = 15

Explanation:

for the phosphorus you multiply the mole number which number of atom present, same thing applicable to the oxygen atom

Related Questions

Where must you be standing if the Sun appears to be directly overhead at noon?
O A. At the South Pole
O B. At the North Pole
O C. At a point somewhere along the prime meridian
O D. At a point somewhere along the equator​

Answers

Answer:

D

Explanation:

at a point somewhere along the equator

In the case when the Sun appears to be directly overhead at noon should be along with the equator.

What is the equator?

It is considered to be the imaginary line that should be arounded with the middle of the planet or the celestial body. It is halfway that lies between the  North Pole and the South Pole, at 0 degrees latitude. In the equator, it divides the planet into a Northern Hemisphere and a Southern Hemisphere

Therefore, based on the above explanation, the option d is correct.

Learn more about sun here: https://brainly.com/question/20827000

Given the following information:
Heat of sublimation of Li(s) = 166 kJ/mol
Bond energy of HCl = 427 kJ/mol
Ionization energy of Li(g) = 520. kJ/mol
Electron affinity of Cl(g) = -2349 kJ/mol
Lattice energy of LiCl(s) = -2829 kJ/mol
Bond energy of H₂ = -432 kJ/mol
Calculate the net change in energy for the following reaction:
2Li(s) + 2HCl(g) --> 2LiCl(s) + H₂(g)

Answers

Answer:

Ya'll should really practice more because things like these are easy

Explanation:

You guys need to practice more since stuff like this are pretty simple.

What is net change?According to the net change theorem, the ultimate value of a quantity equals the beginning value plus the integral of the rate of change when a quantity changes. The net change can be positive, negative, or zero.The term "Net Change in Cash" indicates how much Cash and Cash Equivalents changed in value during the reporting period. It is the main punchline of the Cash Flow Statement. Net Cash Change quantifies how much the value of Cash and Cash Equivalents changed during the reporting period. The main punchline on the Cash Flow Statement is this. When using net cash as a barometer to determine a company's financial health, it is critical to analyse what activities contribute to positive or negative net cash.

To learn more about net change refer to:

https://brainly.com/question/28716897

#SPJ2

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

Answers

The question is incomplete, the complete question is;

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

Experimental melting point is BELOW literature value

Experimental melting point is CLOSE to literature value

WIDE melting point range

NARROW melting point range

Answer:

narrow melting point-pure sample of a single compound

experimental melting point is close to literature value-pure sample of a single compound

wide melting point range-impure sample of multiple compounds

experimental melting point is below literature value-impure sample of multiple compounds

Explanation:

The experimental melting point of a pure single compound is sharp and extremely close to the melting point of the substance as recorded in the literature. Usually, a pure substance melts within a narrow range of temperatures.

Impure samples of multiple compounds melt over a range of temperatures. Also if the experimental melting point is well below the record in literature, then the sample is contaminated by other compounds.

what is a substrate

Answers

Answer:

a substrate is surface or material on or from an organism lives, grows, or obtains its nourishment.

Explanation:

Hey I hope this helps.....

EZ MODE -_- What could you do in an experiment to get more accurate results?  Change two of your variables. Only make observations that involve sight. Only use new materials. Perform repeated trials​

Answers

Answer:

they change the object hehehehe

Answer:

D. Perform repeated trials.

Explanation:

I did the exam and got it correct :D!

Given the unbalanced equation showing the reactants and product of a reaction occurring at 298 K and 100. kPa:

____P4(s) + ____Cl2(g) ____PCl3(l) + energy
Balance the equation below for the reaction, using the smallest whole number coefficients.

____P4(s) + ____Cl2(g) ____PCl3(l) + energy

Answers

Balanced equation

P4(s) +6Cl2(g) ⇒4PCl3(l) + energy

Further explanation

Given

Reaction(unbalnced)

P4(s) +Cl2(g) ⇒PCl3(l) + energy

Required

Balanced equation

Solution

Give a coefficient

aP4(s) +bCl2(g) ⇒PCl3(l) + energy

Make an equation

P, left=4a, right=1⇒4a=1⇒a=1/4

Cl, left=2b, right=3⇒2b=3⇒b=3/2

The equation becomes:

1/4P4(s) +3/2Cl2(g) ⇒PCl3(l) + energy x 4

P4(s) +6Cl2(g) ⇒4PCl3(l) + energy

PLEASE HELP THIS IS OVER DUE AND I NEED TO GET IT DONE IM REALLY BAD AT CHEMISTRY
In which state of matter (Solid, liquid, or a gas) do atoms/particles move the fastest?

Answers

Answer:

Gas

Explanation:

I hope it helps ❤❤❤

.......

Answer:

Gas

Explanation:

Solid= Particles are really tight (Example: Ice Cube) Has a fixed shape

Liquid= Particles flow freely but is of constant volume.(Liquid fills it's container. Example: Water) No fixed shape

Gas= Particles move freely can fill its container has NO FIXED SHAPE or NO FIXED VOLUME(Example: Oxygen) Particels move FASTEST

What happens when the number of electrons and protons inside of an atom are Not equel?

Answers

Hello, It's me Moriah Elizabeth!

Answer:

When the number of electrons does not equal the number of protons, the atom is ionized.

atoms or helium nickel would represent _____

Answers

Answer:

they represent their own atoms

Answer:

Elements

Explanation:

please help me I will give brainesty if your right ​

Answers

Answer:

Sunlight

Explanation:

My science teacher has told us that plants need the sun to photosynthesis. And even though their is a lot of sun, they need to compete for it still.

How many grams of lithium chloride, molecular mass 42.5, are dissolved in water to make 500 mL of a 0.450 M solution?

A) 9.56g
B) 42.50g
C)21.25g
D)47.22g

Answers

Answer:

9.5625 gram

Explanation:

Molarity = mass in gram ÷ molar mass × volume in dm3

Mass in gram = molarity× molar mass × volume of solution in dm3

Mass in gram = 0.450×42.5×0.5=9.5625 g

Which of the following groups of elements has two valence electrons and is highly reactive?

Select one:
a. Alkali metals
b. Alkaline-earth metals
c. Halogens
d. Noble gases

Answers

B, Alkaline earth metals

explain how to find the mass of water. show your calculations as well​

Answers

Answer:

You can find the mass of water by multiplying the density of water by its volume.

mass = Density x volume

Explanation:

It is very easy to find the mass of water once you know the formula of density. "Density" refers to mass per unit volume.

Density (ρ) = [tex]\frac{mass}{volume}[/tex]

Therefore, mass = ρ x volume

The density of water is 1 kg/L.

For example, if the volume of water is 500 ml, then you can get its mass by multiplying 500 ml by 1 kg/L.

Let's convert 500 ml to Liter first.

500 ml x [tex]\frac{1 L}{1,000 ml}[/tex] = 0.5 L

Now, let's compute.

mass = ρ x volume

mass = 1 kg/L x 0.5L

mass = 0.5 kg

The mass of a 500-ml water is 0.5 kg.

Help me asap it’s for my chem

Answers

1 is oxygen
2 is c=1 O=2
3 is 10
4 is 4 C 12 H
5 is 4 Na 2S 8 O

How many moles are in 5.32 x 1020 atoms
of copper?
What is the answer but in numbers ?

Answers

Answer is 1.41 x 10 with the exponent of 24, atoms

Explanation : Look at the picture i attached.

Question 6 of 10
What is an anode?
A. The electrode that is oxidized in a galvanic cell
B. The solution inside a salt bridge
C. The electrode that is reduced in a galvanic cell
D. The electrolytes around an electrode
SUBMIT

Answers

Answer:

I believe the answer is A, sorry if i'm wrong

Explanation:

What is the correct name for H3AsO3

Answers

Answer:

arsenous acid

Explanation:

Arsenious acid. I apologize if I was incorrect.

Why do scientists often use bacteria to produce medicines?​

Answers

Answer:

Bbbbb eg2020

Explanation:

Bbbbb

Yes they do because its their job

What is the momentum of a bird with a mass of 2 kg flying at 9 m/s? *

Answers

Answer:

18 kg.m/s

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 2 × 9

We have the final answer as

18 kg.m/s

Hope this helps you

An atom has 38 protons and 42 neutrons it is ?

Answers

Answer:

The answer is, Strontium

Answer:

Name                         Molybdenum

Atomic Mass                95.94 atomic mass units

Number of Protons 42

Number of Neutrons 54

Number of Electrons 42

Explanation:

A student spends 4.5 hours studying for a test. How much time is this equivalent to in seconds
Select one:
a)2,700 seconds
b)16,200 seconds
c)270 seconds
d)6,480 seconds

Answers

the answer is: b)16,200 seconds :)

TOPICAL ASSINMENT 2
1. If 25cm' of O.IM H,SO, solution neutralised a solution containing 1.06g anhydrous sodium carbonate in
250cm. of solution, calculate the molarity and the volume of the sodium carbonate solution used. (3mks)​

Answers

The molarity = 0.04 M

The volume = 6.25 ml

Further explanation

Given

25cm³ of 0.1 M H₂SO₄

1.06g Na₂CO₃ in  250cm³ of solution

Required

the molarity and the volume of Na₂CO₃

Solution

Molarity of  Na₂CO₃ :

[tex]\tt \dfrac{1.06/106~mol}{0.25~L}=0.04~M[/tex]

Reaction

H₂SO₄ + Na₂CO₃ ⇒Na₂SO₄ + H₂O + CO₂

mol H₂SO₄ = 25 x 0.1 = 0.25 mlmol= 2.5 x 10⁻⁴ moles of  Na₂CO₃

The volume of solution used :

[tex]\tt V=\dfrac{n}{M}=\dfrac{2.5.10^{-4}}{0.04}=6.25.10^{-3}~L=6.25~ml[/tex]

What types of radiation cause the parent isotope to change into a different element?

Answers

Answer:

Beta decay is most common in elements with a high neutron to proton ratio. Gamma decay follows the form: In gamma emission, neither the atomic number or the mass number is changed. A high energy gamma ray is given off when the parent isotope falls into a lower energy state.

Explanation:

pls mark me as brainliest

You can tell if an object is in motion if ___.
A. Its reference point is in motion
B. Its reference point is stationary
C. Its position changes relative to a reference point
D. It appears to move backward when another object moves forward

Answers

Answer:

c

Explanation:

I think that's the answer

A family consumes 2.5 gallons of milk per week. How many liters of milk do they need to buy for one month? (Assume there are exactly 4 weeks in 1 month) SHOW WORK

Answers

Answer:

37.85 liters

Explanation:

they need 10 gallons for a month (2.5*4)

after that, convert gallons to liters (conversion to liters= 3.785)

10*3.7585= 37.85

PLEASE ANSWER FAST DUE IN 2 MINUTES

The gas released by animal into the environment is ______

Answers

Answer:

Carbon dioxide gas

Explanation:

When an animal breathes, it takes in oxygen gas and releases carbon dioxide gas into the atmosphere.

Explain the horizontal periodic trend

Answers

Answer:

Trends on the Periodic Table have a vertical component and a horizontal component. Vertical trend: as more “shells” are added to the electron cloud, it expands. Horizontal trend: if atoms have the same number of “shells”, atoms with more protons will draw the electron cloud in tighter.

Explanation:

What is the total pressure in units of kPa in a 7.85 L container that contains 4.45 moles of N2 and 2.45 moles of O2 at a temperature of 307 K?

Answers

Answer:

Total pressure = 22.15 atm

Explanation:

Given data:

Total pressure = ?

Volume of container = 7.85 L

Number of moles of N₂ = 4.45 mol

Number of moles of O₂ = 2.45 mol

Temperature = 307 K

Solution:

Pressure of N₂:

PV = nRT

P = nRT/V

P = 4.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L

P = 112.16 atm.L/7.85 L

P = 14.28 atm

Pressure of O₂:

PV = nRT

P = nRT/V

P = 2.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L

P = 61.75 atm.L/7.85 L

P = 7.87 atm

Total pressure = P(N₂) + P(O₂)

Total pressure = P( 14.28 atm)  +  P( 7.87 atm)

Total pressure = 22.15 atm

5(a) Consider the following schemes
Petroleum
>petroleum fractions
Higher petroleum fractions 1 , petrol + x
X + Y MI >CH,CICH,CI
nX"V (CH2 - CH2 - CH2-CH2)n
(i) State the type of reaction involved in I to IV​

Answers

Answer:

is number 1

Explanation:

cause i know

What does bananas batteries and people have in common

Answers

Simple, humans share 60% of DNA with bananas. That means that you are asking the similarities to humans and batteries which means the answer is that they both have energy or can be used as ‘portable energy.’
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