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Answer:

Explanation: wht do i do??

1.Atomic Number (Z) = Mass Number (A) - Number of Neutrons

neutrons = mass number-atomic number

Atomic mass Cl-37= 17

Mass number Cl-37=37

Neutrons = 37-17=20

2. Mass atom X = mass isotope 1 . % + mass isotope 2.%...

[tex]\tt atomic~mass~X=0.0224\times 88+0.7832\times 90+0.1944\times 91=90.1[/tex]

3. The energy in one photon can be formulated as

[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]

f = c / λ, so :

[tex]\tt E\approx f\approx \dfrac{1}{\lambda}[/tex]

Energy is directly proportional to frequency and inversely proportional to the wavelength

So, as the frequency of photon increases, the energy of photon increases

4. Based on answer number 3 :

A. The wavelength becomes longer, and the energy decreases

Answer:

12.0778

Explanation:

Answer:

It tells you on the chart I've attached. It's all color coded. :p

Answer: Molar mass is the amount grams that one mole weighs.

Explanation: You need to find the molar mass of NaCl which is the same as the amu on the periodic table in grams. So it is 22.99(Na) + 35.45(Cl) = 58.44

You also know that for every mole of NaCl you have 1 mole of Na because every molecule of NaCl has 1 atom of Na.

Finally, using the periodic table, again, you see that the molar mass of Na is 22.99.

Then using stoichiometry, you can find the grams of sodium.

100(g NaCl) * 1 mol (NaCl)/58.44 g (NaCl) * 1 mol (Na)/ 1 mol (NaCl) * 22.99 (g of Na)/ 1 mol (Na)

which equals 39.339435 g of Na.

If you need to maintain significant figures the answer will be 40.

Explanation:

they have wave nature

its correct answer

For condensation to take place there should be noticeable difference between the temperature of the system and the atmosphere. Thus condensation is the reason for clinging of water particles to the side of the glass.

Condensation is a process in which the vapor state converts to liquid state. Condensation is the reverse process of evaporation. Condensation occur at dew point. Dew point is the temperature at which condensation starts.

When the hot air particles collides with the surface of the glass having ice water, then the hot particles that had so much energy or kinetic energy suddenly reduces its energy and converts to water due to the change in temperature and pressure .

Thus condensation is the reason for clinging of water particles to the side of the glass having ice water.

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Explanation:

Both (Photosynthesis and Cellular respiration)

Because

Therefore,

Both is correct✔

Answer:An iodide ion is the ion I−. Compounds with iodine in formal oxidation state −1 are called iodides. This page is for the iodide ion and its salts, not organo iodine compounds. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate.

brainliest pls

Mass of Cl₂ : 164.01 g

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol Cl₂ :

[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.39.10^{24}}{6.02.10^{23}}\\\\n=2.31[/tex]

mass Cl₂(MW=71 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=2.31\times 71=164.01[/tex]

Answer:

hui

Explanation:

Answer:

The central atom is S.

Explanation:

Look at the structure.

Answer:

1. length x width x height

Answer:

1st.

thats the one for u to choose

Answer: Mendelevium

Explanation:

Answer:

2.75 × 10^-45 m

Explanation:

From;

E= hc/wavelength

h= Plank's constant= 6.6 × 10^-34 Js

c= speed of light=3× 10^8 ms-1

Wavelength = 6.6 × 10^-34 × 3× 10^8/7.21 × 10^19

Wavelength= 2.75 × 10^-45 m

Answer:

Calcium

Explanation:

The number of protons is the atomic number of the element. Number 20 on the periodic table is Calcium.

There can be two, solid (Hail) and liquid (Water).

Answer:

liquid and solid

liquid- rain

solid- hail and snow

I don't know about gas; probably not.

Answer:

6u and 7u

Explanation:

no of neutrons in 1= 3

no of protons in 1=3

mass=3+3=6

same method applies to the 2nd one

Answer:

1977

Explanation:

Getting connected: a history of modems. Then, in 1977, Dale Heatherington and Dennis Hayes created the world's first PC modem, the 80-103A.

Answer:

A circut is comepleted

Explanation:

The bulb light when the needle touches a paper clip because the circuit is completed.

An electronic circuit comprises of individual electronic components like resistors, diodes,transistors , capacitors,etc. which are connected to each other by means of wires  through which electric current flows.It can also be referred to as an electronic circuit.

It usually comprises of at least one active component . The combination of wires and simple and complex components allows operations to be performed, amplification of signals, displacement of data and performing of computations.

There are  three types of circuits , an analog circuit ,a digital circuit and a mixed circuit which is combination of digital and analog circuits , even semiconductors are used in circuits.

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Mass MgSO₄ = 262.8 g

Given

2.190 mol MgSO₄

Required

mass

Solution

The molecular formula should be MgSO₄

So MW MgSO₄ :

= Ar Mg + Ar S + 4. Ar O

= 24 + 32 + 4. 16

= 120 g/mol

Mass MgSO₄ :

[tex]\tt mass=mol\times MW\\\\mass=2.19\times 120\\\\mass=262.8~g[/tex]

In an ecosystem, 20 percent of the protein consumed by humans around the world is fish.

An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the ecosystem .Living organisms also influence the quantity of biomass which is present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

670.956

Explanation:

You can use this equation to solve for heat :

Q = m * c * ΔT

Q represents the heat

m represents the mass in kilograms

c is the specific heat. For aluminum, it's 897

ΔT is the change in temperature, so, 49 - 15 which is 34

Plug in the numbers and you get this :

Q = 0.022 * 897 * 34

Q = 670.956 Joules

Answer:

The Second Law

Explanation:

Answer: Convection

Explanation:

I hope this helps :D

Answer:

Radiation

Explanation:

It said that was the answer on the test.

A pan of water is sitting outside during a hot sunny day. The temperature of the water goes up. What type of heat transfer caused the temperature to go up?

conduction

induction

Incorrect: convection

Correct: radiation

Answer:

May be 119 elements are artificially made.

Answer:

119 elements are artificially made...

Answer:

this is true

Explanation:

chlorine only needs to lose one electron to become stable and sulphur needs to lose two

Answer:

There's no statement...

Answer:

Independent Variable

Explanation: