What is the volume of the water?
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Answer:

How does critical mass play a role in a nuclear reaction?

Explanation:

It is the minimum amount of material needed to start a fission reaction. ... It is the minimum amount of material needed to sustain a fission reaction.

Answer:

true

Explanation:

Answer:

Explanation:

Weather refers to short-term changes in the atmosphere of each day ,

Climate describes what the weather is like over a long period of time in a specific area. Different regions can have different climates

Answer:

Si

Explanation:

Answer:

let's look at the far left column of the periodic table. this pattern tells us that these elements are the noble gases. Noble gas is all conduct electricity and they are all odorless and colorless. The Roman numeral above this column means that there is one free electron (valence electron) in the outer shell, except for helium which has two. That's why it's a different color from the rest in the same column.

Answer:

=0.337mol Ca this is the correct answer :)

Answer: 15.3 grams C

Explanation:  1 mole is 6.02x10^23 atoms.  We can find the moles of C in 7.675 x 10^23 atoms of C by dividing:

(7.675 x 10^23 atoms C)/(6.02x10^23 atoms C/mole) = 1.275 moles C

The molar mass of carbon is 12g/mole.  So the mass of 7.675 x 10^23 atoms is (1.275 moles C)*(12 g/mole C) = 15.3 grams.

Answer:

Neutron

Explanation:

Protons have a positive charge

Electrons have a negative charge

Neutrons have a neutral charge

Answer:

In what way is a polar-covalent bond similar to an ionic bond? There is a difference between the electronegativities of the two atoms in both types of bonds that results in electrons being more closely associated with the more electronegative atom.

Explanation:

Answer:

your answer should be B ANDC

Answer:

B and c is your answer

Explanation:

Answer:

For organic compounds, carbon and hydrogen are listed as the first elements in the molecular formula, and they are followed by the remaining elements in alphabetical order. For example, for butane, the molecular formula is C 4 H 10.

Explanation:

Answer:

False

Explanation:

Refer to the picture for better understanding

Hope this helps :)

pls make brainliest :p

And have an amazing day <3

This are the required answers based on the food chain and ecosystem.

If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D

Answer:Animals eat other organisms — Animals cannot produce their own energy without consuming other organisms.

Birds considered as consumers — Birds eat plants.

We see some animals in different food chain — because some animals consume more than one type of organism.

Some animals may live side by side — There is a limited amount of space found in ecosystems.

The best statement that explains why do organisms need energy — Energy is necessary for cells to function.

This are the required answers based on the food chain and ecosystem.

If you have any doubts regarding on my answer. Feel free to share the doubts with me in comments section :D

Explanation:

To determine the moles of O₂ needed, we have to know in what ratio the two reactants react and then use the moles of C₂H₂  in reaction to determine the moles of O₂  needed. We can find this out based on their coefficient in a balanced equation:

Write a Balance Equation

2C₂H₂  +   5O₂   →     4CO₂   +   2H₂O

Compare the Mole Ratio (Equation Coefficient of C₂H₂  to  O₂)

Based on the equation, the mole ratio of C₂H₂  to  O₂  is 2 to 5. Therefore for every molecule of C₂H₂, ⁵/₂ C₂H₂ molecules are needed to react.

Find the moles of O₂

Since the number of moles of  C₂H₂   =    2.60 moles

                                then moles of O₂ = 2.60 moles × ⁵/₂

Answer:

Well,You have to understand pretty much everything, If you know the number of protons or electron then you will know its atomic number,and if you know the number of protons and neutrons then you will know the mass of the element. so, once you grasp these concepts, you can better understand new elements.Explanation:

Answer:

The angular momentum quantum number, l, describes the shape of the orbital that an electron occupies. The lowest possible value of l is 0, and its highest possible value, depending on the principal quantum number, is n - 1.

Wavelength = Speed of Light ÷ Frequency

                    = (2.99 × 10⁸ m/s) ÷ (1.7 x 10¹⁷ /s)

                    = 1.76 ×10⁻⁹ m

Answer:

What happens when you change the ratio of elements in a compound?

If two elements combine in a different ratio, the result is a different compound. In other words, the same compound will always form from the same elements in the same ratio.

Explanation:

How do you find the ratio of an element?

Convert the mass of each element to moles of each element using the atomic masses. Find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles. There are fewer moles of oxygen than any other element, so we will assume one mole of oxygen to establish the ratios.

.

.What is the ratio of the elements?

The atomic ratio is a measure of the ratio of atoms of one kind (i) to another kind (j). A closely related concept is the atomic percent (or at. %), which gives the percentage of one kind of atom relative to the total number of atoms. The molecular equivalents of these concepts are the molar fraction, or molar percent

The conservation of energy allows finding the relationship between pressure and temperature is:

Pressure is defined by the relationship between force and area of ​​application.

         P =[tex]\frac{F}{A}[/tex]

Where P is the pressure, F is the force and A is the area.

In the case of alcohol in the gaseous state, the mechanical energy of the molecules is only kinetic energy, it is related to temperature by the Boltzmann equation.

             Em = K = [tex]\frac{3}{2}[/tex] kT

            ½ m v² = 3/2 k T

              v² = [tex]\frac{3 k T}{m}[/tex]  

Where m is the mass, v the velocity of the particles, k the Boltzmann constant and T the absolute temperature.

From this equation we see that as the temperature increases, the speed of the alcohol molecules also increases.

Using the relationship between the impulse and the change of momentum we can find the mean force.

               I = F t = Δp

Where I impulse, F is the force, t is the time, Δp is the change of momentum.

if we assume elastic collisions the amount of initial and final moment are equal.

               [tex]F = \frac{2p}{t} \\F = \frac{2m}{t} v[/tex]

If we assume that the molecules go at a constant speed.

              v = d / t

              t = d / v

Let's substitute.

               [tex]F = \frac{2m}{d} v^2[/tex]

We substitute in the pressure equation.

               P = 2m / Ad v²

                [tex]P = \frac{6k}{ A d} \ T[/tex]

In conclusion using the conservation of energy we can find the relationship between pressure and temperature is:

Learn more here: brainly.com/question/20638378

Answer:  6.022 × 10²³

Explanation:

Avogadro's Number (6.022 × 10²³ atoms/mole) is the number of atoms in any mole of a substance.

Answer:

Teens use more phone data then adults because of apps, photos and other things. There is not a certain number for how much data teens use but research says teens use up more than a half of a phone storage. Teens spend from 3-4 hours on phone because of limits but they could spend a whole day.

Explanation:

Answer:

Because they are smaller than an atom

Explanation:

Answer:

204.4 amu.  

Explanation:

30% of thallium will be multiplied by the mass number of thallium-203(203). 70% thallium will be multiplied by the mass number of thallium-205(205).

Then you will add them up.

So, (0.30x203) + (0.70x205) = 204.4 amu.

The metal thallium have two isotopes with different masses. The average atomic mass of thallium is 204.4.

Isotopes are atoms with same atomic number and different mass number. For example hydrogen have three isotopes namely proton, deuteron and triton with masses 1, 2 and 3 au respectively.

The average atomic mass of an atom can be calculated from the percentage abundance and masses of its isotopes as given below:

atomic mass = ∑ (% abundance/100) mass

The mass of metal thallium is calculated as follows:

Atomic mass of  thallium = [tex][\frac{30}{100}\times 203] + [\frac{70}{100}\times 205]= 204.4[/tex]

Hence, the average atomic mass of thallium is 204.4 au.

To learn more about isotopes, refer the link below:

https://brainly.com/question/21536220

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Answer:

no

Explanation:

changing the number of protons will change the atomic number, and if the atomic number is changed, it will become a different element. if you give oxygen 9 protons, it would no longer be oxygen, it would be fluoride.

Answer:

Save the *minerals* used to extract metals.

Answer:

32gcm3

so yea i hope this helps u

Answer:

4 g / cm^3

Explanation:

Mass = 32 g

Volume of cube = 2 x 2 x 2 = 8 cm^3

Formula : -

Density = Mass / Volume

Density = 32 / 8

Density = 4 g / cm^3

pretty sure its d and g

just my opinion

Answer:

what subject is this? science?