What is the name of the 3 lenses that have different powers of magnification 4x, 10x and 40x

Answer:

1. 40 grams of NaCI

2. 20 grams of Barium Peroxide

Explanation:

For Question 1, there are 400 grams of NaCI. There are 10 drops.

So, we have to divide 400 by 10.

We get 40 as our result, so 40 is the answer.

There are 800 grams of barium peroxide, and there are 40 drops.

So, we divide 800 by 40.

We have the answer as 20.

Our final answers are going to be listed below:

Hope this helps you!

*Make proportions to solve. Find the rate from the question 1.

Question 1 is 40.

There are 400 grams of NaCI. There are 10 drops.

Divide 400 by 10.

400 / 10 = 40

40 is the answer.

Now all we do is repeat the same process for question 2.

Question 2 is 20.

There are 800 grams of barium peroxide, and there are 40 drops.

Divide 800 by 40.

800 / 40 = 20

Answer = 20.

A. Breaking a Cl-Br bond

Answer:

The mass of Na₂O that can be produced by the chemical reaction of 4.0 grams of sodium with excess oxygen in the reaction is 5.39 grams.

Explanation:

You know  the balanced reaction:

4 NA + O₂ ⟶ 2 Na₂O

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) react and are produced:

Being:

the molar mass of the compounds participating in the reaction is:

Then by stoichiometry of the reaction they react and are produced:

Then you can apply the following rule of three: if 92 grams of Na produce 124 grams of Na₂O, 4 grams of Na, how much mass of Na₂O does it produce?

[tex]massofNa_{2}O =\frac{4 grams of Na*124 gramsofNa_{2}O }{92 grams of Na}[/tex]

mass of Na₂O=5.39 g

The mass of Na₂O that can be produced by the chemical reaction of 4.0 grams of sodium with excess oxygen in the reaction is 5.39 grams.

Answer:

Global warming is causing global mean sea level to rise in two ways. First, glaciers and ice sheets worldwide are melting and adding water to the ocean. ... A third, much smaller contributor to sea level rise is a decline in the amount of liquid water on land—aquifers, lakes and reservoirs, rivers, soil moisture.

Explanation:

Answer:

It has caused sea levels to rise and caused glaciers to melt.

Explanation:

Because glaciers and ice caps are melting rapidly and they store about 1.7% all of Earth's water, causing sea levels to rise.

Answer:

1.67 M

Explanation:

The following data were obtained from the question:

Initial volume (V1) of solution = 250 mL

Initial Molarity (M1) of solution = 0.5 M

Final volume (V2) of solution = 75 mL

Final Molarity (M2) of solution =?

Thus, we can obtain the final molarity of the solution by using the following formula:

M1V1 = M2V2

0.5 × 250 = M2 × 75

125 = M2 × 75

Divide both side by 75

M2 = 125 /75

M2 = 1.67 M

Thus, the new Molarity of the solution is 1.67 M.

Answer:

C

Explanation:

The stomach digests the food (Digestive System) are the nerves and they send the protein etc.

Answer:

49.4 cal

Explanation:

Step 1: Given data

Composition of 1 cup of watermelon: 0.9 g protein, 0.2 g fat, and 11 g carbohydrate.

Step 2: Calculate the calories provided by 0.9 g of protein

1 g of protein yields 4 cal.

0.9 g × (4 cal/1 g) = 3.6 cal

Step 3: Calculate the calories provided by 0.2 g of fat

1 g of fat yields 9 cal.

0.2 g × (9 cal/1 g) = 1.8 cal

Step 4: Calculate the calories provided by 11 g of carbohydrate

1 g of carbohydrate yields 4 cal.

11 g × (4 cal/1 g) = 44 cal

Step 5: Calculate the total number of calories

3.6 cal + 1.8 cal + 44 cal = 49.4 cal

The percentage CaCl₂ : 65.14%

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

3CaCl₂+2Na₃PO₄⇒Ca₃(PO₄)₂ + 6NaCl

mol Ca₃(PO₄)₂(MW=310.18 g/mol) :

[tex]\tt \dfrac{0.425}{310.18}=0.00137[/tex]

mol ratio CaCl₂ : Ca₃(PO₄)₂ = 3 : 1, so mol CaCl₂ :

[tex]\tt \dfrac{3}{1}\times 0.00137=0.00411[/tex]

mass CaCl₂ (MW=110.98 g/mol) :

[tex]\tt 0.00411\times 110.98=0.456~g[/tex]

The percentage CaCl₂ :

[tex]\tt \%CaCl_2~in~mixture=\dfrac{0.456}{0.7}\times 100\%=65.14\%[/tex]

Answer: 0.006 km

Explanation:

divide the length value by 1000

so 6/1000 = 0.006

At STP 32 g of O₂ would occupy by the same volume as  4 g of He

Complete question

At STP 32 g of O₂ would occupy by the same volume as:

Standard Conditions

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

So the gas will have the same volume if the number of moles is the same

mol of 32 grams of O₂ :

[tex]\tt \dfrac{32}{32}=1[/tex]

[tex]\tt mol=\dfrac{4}{4}=1[/tex]

[tex]\tt mol=\dfrac{8}{16}=0.5[/tex]

[tex]\tt mol=\dfrac{64}{2}=32[/tex]

[tex]\tt mol=\dfrac{32}{64}=0.5[/tex]

So mol of 4 g He = mol of 32 g O₂

STP is the standard temperature and pressure of the gas to compare with the experimental data. At STP 32 gm of oxygen is equivalent to 4 gm of helium.

STP is the standard temperature and pressure of 0 degrees Celsius and 1 atm. At this temperature and pressure, the volume of the gas is 22.4 L/mol.

So, if the moles of the 32 gm oxygen are the same as the other element then the volume will also be the same. Here, the moles of oxygen are 1 mol.

Moles of 4 gm helium is 1, 8 gm methane is 0.5 mol, 64 gm dihydrogen is 32 mol, and 32 gm sulfur dioxide is 0.5 mol.

Therefore, the mole of 4 gm helium is equivalent to the mole of 32 gm oxygen.

Learn more about STP here:

https://brainly.com/question/25705287

Answer:

The correct answer is 0.089 g/L ≅ 0.09 g/L

Explanation:

Density is defined as: mass/volume.

From the problem we have:

number of moles = n = 3 mol

volume = V = 67.20 L

We have to calculate the mass. For this, we need the molar mass (MM) of the gas. That is easily calculated from the molar mass of the element hydrogen (H), as we know that hydrogen gas has the molecular formula H₂:

MM(H₂) = 2 x molar mass H = 2 x 1 g/mol = 2 g/mol

Now, we multiply n by MM to obtain the mass (m) of the gas:

m = n x MM(H₂) = 3 mol x 2 g/mol = 6 g

Finally, we calculate the density from the mass and volume:

density = m/V = 6 g/(67.20) = 0.089 g/L ≅ 0.09 g/L

Answer:

sp hybridized orbitals

The bond angle is 180 degrees

Explanation:

Molecules are formed by overlap of atomic orbitals. Hybridization is a valence bond concept. According to this concept, atomic orbitals are mixed to obtain orbitals of appropriate energy, suitable for bonding.

The sigma bonds in CO2 are formed by sp hybridized carbon atoms. The bond angle of sp hybridized carbon atoms is 180 degrees leading to a linear shape.

Answer:

Volume V2 = 948.13 ml

Explanation:

Given:

Volume V1 = 525 ml

Temperature T1 = -25°C + 273.15

Volume V2 = ?

Temperature T1 = 175°C + 273.15

Computation:

V1 / T1 = V2 / T2

525 / [-25°C + 273.15] = V2 / [175°C + 273.15]

Volume V2 = 948.13 ml

The new volume, in milliliters, of the gas is 948 L

From the question,

We are to determine the new volume of the gas.

From Charles' law which states that the volume of a fixed mass of gas is directly proportional to the temperature (in Kelvin) provided that the pressure remains constant.

That is,

V ∝ T

Then,

V = kT

Therefore, we can write that

[tex]\frac{V_{1} }{T_{1}} = \frac{V_{2}}{T_{2}}[/tex]

Where [tex]V_{1}[/tex] is the initial volume

[tex]T_{1}[/tex] is the initial temperature

[tex]V_{2}[/tex] is the final volume

and [tex]T_{2}[/tex] is the final temperature

From the given information,

[tex]V_{1} = 525 \ mL[/tex]

[tex]T_{1} = -25 ^{\circ}C = -25 + 273.15 \ K = 248.15 \ K[/tex]

[tex]T_{2} = 175 ^{\circ} C = 175 +273.15 \ K =448.15 \ K[/tex]

Putting the values into the formula, we get

[tex]\frac{525}{248.15} = \frac{V_{2} }{448.15}[/tex]

∴ [tex]V_{2} = \frac{525 \times 448.15}{248.15}[/tex]

[tex]V_{2} = \frac{235278.75}{248.15}[/tex]

[tex]V_{2} = 948.13 \ L[/tex]

V₂ ≅ 948 L

Hence, the new volume, in milliliters, of the gas is 948 L

Learn more here: https://brainly.com/question/12717895

Mass of sodium carbonate = 7.022 g

Reaction

Na₂CO₃ + 2HNO₃ ⇒ 2NaNO₃ + H₂O + CO₂

mol of HNO₃ (MW=63,01 g/mol):

[tex]\tt mol=\dfrac{8.35}{63.01}=0.1325[/tex]

mol Na₂CO₃

[tex]\tt \dfrac{1}{2}\times 0.1325=0.06625[/tex]

mass Na₂CO₃(MW = 105,9888 g/mol) :

[tex]\tt 0.06625\times 105,9888 g/mol=7.022~g[/tex]

The mass of sodium carbonate that is required for complete reaction with 8.35 grams of nitric acid is equal to 7.02 grams.

Given the following data:

Scientific data:

To determine the mass of sodium carbonate that is required for complete reaction with 8.35 grams of nitric acid:

First of all, we would write the properly balanced chemical equation for this chemical reaction:

                        [tex]Na_2CO_3 + 2HNO_3 \rightarrow 2NaNO_3 + H_2O + CO_2[/tex]

Next, we would find the number of moles of nitric acid ([tex]HNO_3[/tex]) required:

[tex]Number\;of\;moles = \frac{Mass}{molar\;mass}\\\\Number\;of\;moles = \frac{8.35}{63 }[/tex]

Number of moles = 0.1325 moles.

By stoichiometry:

2 moles of [tex]HNO_3[/tex] = 1 mole of [tex]Na_2CO_3[/tex]

0.1325 moles of [tex]HNO_3[/tex] = X mole of [tex]Na_2CO_3[/tex]

Cross-multiplying, we have:

[tex]2X=0.1325\\\\X=\frac{0.1325}{2}[/tex]

X = 0.0663 moles

Now, we can determine the mass of sodium carbonate that is required:

[tex]Mass = Number\;of\;moles \times molar\;mass\\\\Mass = 0.0663 \times 106[/tex]

Mass of [tex]HNO_3[/tex] = 7.02 grams

Read more: https://brainly.com/question/16906167

Answer:

The correct answer is 5.6 × 10⁻²³ M.

Explanation:

As a highly soluble salt, KBr dissolves easily in water, while Hg₂Br₂ is very less soluble in comparison to KBr.

Let the solubility of Hg₂Br₂ is S mol per liter.

Therefore,

KBr (s) (1.0 M) ⇒ K⁺ (aq) (1M) + Br⁻ (aq) (1M)

Hg₂Br₂ (s) (1-S) ⇔ Hg₂⁺ (aq) (S) + 2Br⁻ (aq) (2S)

Net [Br-] = (2S + 1) M

Ksp = S (2S + 1)²

Ksp = S (4S² + 1 + 4S)

Ksp = 4S³ + S + 4S²

As the solubility is extremely less, therefore, we can ignore S² and S³. Now,

Ksp = S = 5.6 × 10⁻²³ M

Hence, the solubility of Hg₂Br₂ is 5.6 × 10⁻²³ M.

Answer:

a =  4 ms⁻²

Explanation:

Given data:

Mass of person = 60 Kg

Mass of sled = 15 kg

Applied force = 300 N

Acceleration = ?

Solution:

Formula:

F = ma

F = force

m = mass

a = acceleration

now we will put the values in formula.

300 N = (60 Kg+ 15 kg) × a

300 N = 75 Kg  × a

a = 300 N/ 75 Kg

N = kgm/s²

a =  4 ms⁻²

Answer:

What do you need help with?

Explanation:

Answer:

The answer is "152.28%".

Explanation:

Formula for ideal gas:

PV=nRT

equation:

[tex]\to (P+\frac{an^2}{v^2})(v-nb)=nRT \\\\a=2.253 \frac{L^2 atm}{mol^2}\\\\b=4.278 \times 10^{-2} \frac{L}{mol}\\\\n=10.68 \ mol\\\\v= 0.8295 \ L\\\\\to (P+\frac{an^2}{v^2})= \frac{nRT}{(v-nb)}\\\\\to (P)= \frac{nRT}{(v-nb)} - \frac{an^2}{v^2} \\\\[/tex]

          [tex]= \frac{10.68 \times 0.0082 \times 501.9}{0.8295 - (10.68 \times 4.278 \times 10^{-2})} - \frac{2.253 \times 10.68^2}{0.8295^2}\\\\=\frac{43.9543944}{0.4568904} - \frac{256.982587}{0.68807025}\\\\ = 96.2033661- 373.483067\\\\=-277.279701 \\\\ =-277.279701 \ atm[/tex]

The pressure of gas:

[tex]= (530.3 + 277.279701) \ atm\\\\= 807.579701 \ atm \\\\[/tex]

Calculating the pressure percentage:

[tex]=\frac{807.579701}{530.3} \times 100\\\\= 152.28 \%[/tex]

Answer:

Explanation:

Wavelength (λ) = speed/frequency

(λ) = c/f

Where;

c = speed (3× 10^8m/s)

f = frequency (Hz)

(

Answer:

I think it’s chlorine (Cl)

Explanation:

I’m literally doing the same question right now

Answer:

A

Explanation:

liquids thake the shape of what holds them so shape is changing and volume is the same

Answer:

D. A reaction or change in a substance that results in a different substance

Explanation:

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances.

Answer:

No It cannot.

Explanation:

A water cycle does not have an end as it moves all around the earth

The process:

A water cycle can start by water evaporating through the sun's heat from a water bed, such as: Ocean, sea, pond etc.

The heat from the sun will turn the water into water vapour and will go up into the atmosphere.

The water vapor gets together with other vapors and forms clouds.

These clouds will move around the earth, once they are so full of water they drop the water to Earth in some form of precipitation. It could be rain, snow, sleet, or hail.

These water will form ponds or go back in the ocean and the process wil repeat again.

Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.

Answer:

Explanation: Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. ... All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms.

2-methyl-butanamide hydrolysis with NaOH forms a carboxyllic acid, sodiun salt of 2-methyl butanoic acid and ammonia

Explanation:

Answer:

48 hours

Explanation:

Because if the world would spin regularly, then it would take 24 hours. But if it spins half as fast, then it would be 2x more.

Answer:1 mol

Explanation:

the conversion from mol to volume of gas at STP is 22.4L, meaning that the amount of mols in a gas of volume 22.4L at STP is one mol.

(7th grader sorry if its wrong)