3- a) write the formula unit of calcium fluoride.

b) A certain mass m of calcium fluoride contains 1.2*10^23 anions. Deduce the mass (m). NA= 6.02*10^23

2 × 10²⁴ atoms Co

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

4 mol Co (Cobalt)

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 1 sig fig.

2.4088 × 10²⁴ atoms Co ≈ 2 × 10²⁴ atoms Co

Explanation:

Formula : ½ × mv² (mass×velocity)

½ × 55 × 2²= ½×55×4=110J

(½ is also equivalent to 0.5)

J = Joules

Answer:

Refresh your page or if that doesn't work, close your tab and try to click it again or restart your pc

Explanation:

Answer:if you can't close the tabs I suggest try and restart the computer

Explanation:

Answer: The final temperature of the mixture will be [tex]2.5^0C[/tex]

Explanation:

[tex]heat_{absorbed}=heat_{released}[/tex]

As we know that,  

[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex]         .................(1)

where,

q = heat absorbed or released

[tex]m_1[/tex] = mass of first sample of ethanol = 100 ml

[tex]m_2[/tex] = mass of second sample of ethanol = 300 ml

[tex]T_{final}[/tex] = final temperature = ?

[tex]T_1[/tex] = temperature of  first sample of ethanol  = [tex]25^oC=298K[/tex]

[tex]T_2[/tex] = temperature of second sample of ethanol  = [tex]-5^oC=268K[/tex]

[tex]c_1[/tex] = [tex]c_2[/tex] = specific heat of ethanol

 Now put all the given values in equation (1), we get

[tex]-100\times (T_{final}-298)=[300\times (T_{final}-268)][/tex]

[tex]T_{final}=275.5K=2.5^0C[/tex]

Therefore, the final temperature of the mixture will be [tex]2.5^0C[/tex]

Answer:

reflection is correct answer by my views

Answer:

C. telophase 1

Answer:

metaphase 2

Explanation:

Answer:

41.88375 g Fe

Explanation:

Using stoichiometry, we can do this problem. First, we put our given. Then we create an equation using the molar mass of Fe (found on the periodic table, which was 55.845 g Fe), and the resulting equation is:

[tex]0.75 mol Fe * \frac{55.845 g Fe}{1 mol Fe}[/tex]

The mol Fe's cancel, and leave us with:

41.88375 g Fe

Good luck.

Answer:

10

s=8

o=2

Hope it helps to

Answer:

The answer is D Bill Bass

Explanation:

Remember it from the lesson and I took the test.

Answer:

23.4

Explanation:

23.4 g mass of sulfur yielded by this reaction.

[tex]Percentage yield = (Actual / Theoretical)\times 100[/tex]

The theoretical yield for S is as follows:-

[tex]71.0\ gCl_2\times\frac{1\ molCl_2}{71\ g Cl} \times\frac{1}{1} \ mol\times\frac{32.1\ g}{molS} =32.1\ gS[/tex]

Actual yield=[tex]32.1\ gS\times73\%=23.4\ g\ S[/tex]

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Answer:

A I took this quiz today and got it right.

Answer:

C. 80g  Nano3 at 10 degrees Celsius

Explanation:

I just took the test

80 g NaNO₃ at 10 degrees Celsius of a compound dissolved in 100 grams of water at the stated temperature represents a system at equilibrium. Therefore, option C is correct.

The maximum quantity of a chemical that will dissolve in a given amount of solvent at a particular temperature is referred to as its solubility.

Different compounds have very varying solubilities, which is a feature of a particular solute-solvent pair.

A substance's physical and chemical characteristics affect how soluble it is. A few other factors and circumstances can also influence it. A few of these are: temperature, pressure, kind of binding, and forces between the particles.

A system is said to be in equilibrium when 80 grammes of a substance, dissolved in 100 grams of water at 10 degrees Celsius.

Thus, option C is correct.

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Answer:

your carbon footprint is how often you use a car of vehical you can decreese it by riding a bike or walking.

Explanation:

Carbon footprint is like when you ride a car and it produces lots of carbon monoxide in the air. Ways to reduce it is by walking, riding a bicycle or using the bus for transportation. Hope this helps.

Answer:

82.9% Is the percent yield

Explanation:

First, we need to balance the equation.

Ca(CO3) + 2HCl → H2O + CO2 + CaCl2

Since the problem tells you that the excess reactant is Ca(CO3), we just need to Stoichiometry to solve for the theoretical yield.

[tex]\frac{200g HCl}{1}[/tex] x [tex]\frac{1 mole HCl}{36.46gHCl}[/tex] x [tex]\frac{1 mol CO2}{2molHCl}[/tex] x [tex]\frac{44.01CO2}{1molCO2}[/tex] =120.707 g (theoretical yield)

Take your actual yield of 100g, divide that by 120.707, then multiply that decimical by 100.

Answer:

5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Explanation:

The balanced equation in this question is

Iron + Sulfur = Iron(II) Sulfide

Fe (II) + S --> Fe(II)S

Thus one mole of sulfur reacts with one mole of Fe(II)

Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

first one: nitrogen

ammonia (NH3)

//

3. sulfur

sulfur dichloride (SCl2)

//

4. neither (xenon is a noble gas)

//

5. fluorine

hydrogen monoflouride (HF)

//

I'm not too confident with my naming skills but the chemical formula should be right.

Answer:

top one is anaphase and the middle one is cytokinesis can't see enough of the bottom one to tell

Explanation:

Answer:

this is the minutes and hours this is representing

Answer: Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria.

Chlorophyll absorbs mostly in the blue and to a lesser extent red portions of the electromagnetic spectrum, hence its intense green color.

Green substance in producers that traps light energy from the sun, which is then used to combine carbon dioxide and water into sugars in the process of photosynthesis Chlorophyll is vital for photosynthesis, which helps plants get energy from light.

Chlorophyll molecules are specifically arranged in and around pigment protein complexes called photosystems, which are embedded in the thylakoid membranes of chloroplasts.

Request: It would really help if you could make me brainliest

Answer:

2.4 mole of oxygen will react with 2.4 moles of hydrogen

Explanation:

As we know

1 liter = 1000 grams

2H2 + O2 --> 2H2O

Weight of H2 molecule = 2.016 g/mol

Weight of water = 18.01 gram /l

2 mole of oxygen react with 2 mole of H2

2.4 mole of oxygen will react with 2.4 moles of hydrogen

Answer:

Summer

Explanation:

Earth's tilted axis causes the seasons. Throughout the year, different parts of Earth receive the Sun's most direct rays. So, when the North Pole tilts toward the Sun, it's summer in the Northern Hemisphere. And when the South Pole tilts toward the Sun, it's winter in the Northern Hemisphere.

Hope it helped!! Please mark as Brainliest!

Answer:

Summer took the test and got it right

Explanation:

Which season will the northern hemisphere experience when the axis of Earth is tilted towards the sun?

Summer

Answer: Filtration technique

Explanation:

The technique used here is called filtration.

Filtration,is a physical separation process that separates a mixture of an insoluble solid from a liquid ( acting as the solvent) by the use of a filter barrier that allows only the fluid to pass through.

In the case from the question,

As water is poured over the ground coffee, it forms a mixture of which the insoluble solid is the coffee grounds, the water is the liquid  and the filter barrier is the piece of paper  which allows only the brown  liquid coffee to pass through as the filtrate.

Answer:

thanks for share to use a brainly tutor or if any help... I want to say is the answer would be: 800 cm ^3

Explanation:

thank you!

have a great week

The volume is generally measured in Liters, milliliters, cm³, m³, etc. At constant pressure and temperature, the volume produced by six tablets will be 1200 cm³. The correct option is A.

The term volume denotes the capacity that an object can hold. For example if a beaker can hold 100 mL of water then the volume of the beaker is said to be 100 mL. It is represented by the symbol 'V'.

The three dimensional space occupied by the matter is given by the term volume. The SI unit of volume is m³.

Here the volume of three tablets is 600 cm³. Then the volume of one tablet is:

V = 600 / 3 = 200 cm³

Hence the volume produced by six tablets is:

V = 200  × 6 = 1200 cm³.

Thus the volume of six tablets is  1200 cm³.

Thus the correct option is A.

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amount of work done is equal to l/h

so 50/3=16.66667

round your ans to 2 significant figure

so your ans will be 17m/kg