**Answer:**

qns-4

1-multicellular organism

2-unicellular organism

3-unicellular organism

4-multicellular organism

5-unicellular organism

6-multicellular organism

7-unicellular organism

The formula for zirconium(VI) dichromate

**Answer:**

Zr(Cr2O7)2

**Explanation:**

When measuring the brightness of a star, what is a limitation of using apparent magnitude rather than absolute brightness?

Apparent magnitude does not use the star's color or temperature.

Apparent magnitude is only theoretical, thus its value cannot be directly measured with equipment.

Apparent magnitude does not take into account the fact that not all stars are the same distance from Earth.

Apparent magnitude is only on a comparative scale that determines how bright a star looks from a theoretical distance of 32 light-years from Earth.

Answer: Answer:

Explanation:

Apparent magnitude does not take into account the fact that not all stars are the same distance from Earth.

**Apparent **magnitude is only on a comparative scale that determines how bright a star looks from a theoretical distance of 32 light-years from Earth. Therefore, the correct option is** option D.**

Any large, gaseous celestial body that is capable of producing its own light and **illuminates **through radiation. Only a very small portion of the tens of milliards of milliards of **stars **that make up the observable cosmos are readily visible to the eye.

When measuring the **brightness **of a star, what is a limitation of using apparent magnitude rather than absolute brightness. **Apparent **magnitude is only on a comparative scale that determines how bright a star looks from a theoretical distance of 32 light-years from Earth.

Therefore, the correct option is **option D.**

To know more about **star**, here:

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HELPPP ASAPPP

Use the element tile below to calculate the molar mass of He2 (helium gas).

2 g/mol

16.012 g/mol

8.006 g/mol

4.003 g/mol

**Answer: 4.003 g/mol
**

**Explanation:**

So basically Molar mass is the atomic mass of an element and the atomic mass of Helium is 4.0026 or 4.003 g/mol

8.006 g/mol

multiply the molar mass of helium (4.003) by the subscript and you have your answer!

multiply the molar mass of helium (4.003) by the subscript and you have your answer!

Molar Volume of a gas at STP=22.4 L Example 3: Determine the volume of Carbon dioxide created when 15.0 grams of NaHCO3 are decomposed into water, Sodium carbonate, and Carbon dioxide at STP?

**Answer:**

20009 is answer is right 1345678899444

**Explanation:**

thhjbfthvcdthvctyhgffdy

gvhjk ghkde ghjcddxxb hhj hhgddxb ggjbcxdss ggbbsrtyg fy gbsdgh

What happens when dilute sulphuric acid is poured on a copper plate?

Copper does not react with dilute sulphuric acid. So, no reaction will take place when diluting sulphuric acid is poured onto a copper plate. ... When iron nails are placed in a copper sulfate solution, iron displaces copper to form iron sulfate. Slowly, the blue color of the copper sulfate solution turns into green.

Can Intrusive and Extrusive Igneous rocks form from the same mineral composition?

No I can’t

EXAMPLE took the test k12

EXAMPLE took the test k12

PLEASE HELP ME QUICKLY!

Imagine you are at your favorite beach. The sun is shining and you are enjoying the ocean breeze. The temperature is about 89F. You take your shoes off and realize that the sand is almost too hot to walk on. You run to the water's edge to wet your feet after the walk over the sand and realize that the water is almost too cold. Explain the temperature difference between the sand and water using Thermodynamics.

**Answer:**

The specific heat of water is more specific than the heat of sand, therefore, it will take more energy to raise the same amount of water with the same temperature.

**Explanation:**

The temp is 89 F so, 31.67° C

The specific heat of the water is 4.184 J/g° C

The specific heat of the sand is 0.290 J/ g° C

The heat is the amount of energy that is needed to raise the temp. of the substance

You will need a lot more energy to raise the temp of the water then of the same amount of sand, therefore, because of the specific lower heat of the sand it will raise it's temperature quicker compared to water.

In the following reaction 2Na+ 2H20 - 2NaOH + H2: all of the sodium is consumed and a small amount of

liquid water remains at the end of the reaction. Which reactant is the limiting reagent?

A) H20

B) H2

C) Na

D) NaOH

**Answer:**

C) Na

**Explanation:**

The question tells us that all of the sodium (Na) is consumed and that water is left over. This means that sodium would be the limiting reagent.

C)na

I took the test

I took the test

Carbon is more stable element than Silicon. True or False?

the answer would be true

Determine the percent yield for the reaction between 46.5 g of

ZnS and 13.3 g of oxygen if 18.l4 g of ZnO is recovered along with an unknown quantity of sulfur

dioxide.

please show work thank you

Found an answer sheet :)

The **percentage yield **of the **reaction **has been** 46.74%.**

**Percentage yield **can be given as the **ratio **of the **actual **yield to the **theoretical **yield.

For the **theoretical yield**, the balanced **equation **will be:

[tex]\rm 2\;ZnS\;+\;3\;O_2\;\rightarrow\;2\;ZnO\;+\;2\;SO_2[/tex]

Thus, 2 moles of ZnS will give 2 moles of ZnO.

The **moles **of 46.5 g ZnS:

Moles = [tex]\rm \dfrac{weight}{molecular\;weight}[/tex]

ZnS = [tex]\rm \dfrac{46.5}{97.474}[/tex]

**ZnS **=** 0.477 mol**

The moles of 13.3 grams Oxygen:

Oxygen = [tex]\rm \dfrac{13.3}{32}[/tex]

**Oxygen **=** 0.415 mol.**

The moles of 18.14 grams ZnO:

ZnO = [tex]\rm \dfrac{18.14}{81.38}[/tex]

**ZnO **= **0.222 mol**

According to the **balanced **chemical **equation**,

2 moles ZnO = 2 moles ZnS

0.222 mol ZnO = 0.222 mol ZnS

2 moles ZnO = 3 moles Oxygen

0.222 mol ZnO = 0.334 mol of Oxygen

Since, both the **reactants **are in enough **concentration**,

The **theoretical yield **can be calculated with any of the reactants. The theoretical yield of **ZnO **from 46.5 grams of **ZnS **can be given as:

1 mole ZnS = 1 mol ZnO

0.477 mol of ZnS = 0.477 mol of ZnO.

The **mass **of 0.477 mol of ZnO:

**Mass **= **moles **[tex]\times[/tex] molecular weight

Mass of **ZnO **= 0.477 [tex]\times[/tex] 81.38

Mass of ZnO = 38.818 grams.

The **theoretical yield **of ZnO = **38.818 g.**

The **actual** **yield **of ZnO = **18.14 g.**

**Percentage yield **= [tex]\rm \dfrac{18.14}{38.81}\;\times\;100[/tex]

Percentage yield = **46.74 %**

The **percentage yield **of the **reaction **has been** 46.74%.**

For more information about the **percentage yield**, refer to the link:

https://brainly.com/question/11715808

Name the following compound:

CH2 ≡ CH2

Ethyl

Ethyne

Ethane

ethane

**Answer:**

Answer is A. Ethyl.........

**Answer:**

D. ethane

**Explanation:**

1. The pressure of a gas is 100.0 kPa and its volume is 500.0 ml. If the volume increases to 1,000.0 ml, what is the new pressure of the gas?

2. If a gas at 25.0 °C occupies 3.60 liters at a pressure of 10 kPa, what will be its volume at a pressure of 25 kPa?

3. When the pressure on a gas increases three times, by how much will the volume increase or decrease?

4. Boyle's Law deals what quantities?

**Answer:**

**1)** The new pressure of the gas is 500 kilopascals.

**2)** The final volume is 1.44 liters.

**3)** Volume will decrease by approximately 67 %.

**4)** The Boyle's Laws deals with pressures and volumes.

**Explanation:**

**1)** From the **Equation of State for Ideal Gases** we construct the following relationship:

[tex]\frac{P_{2}}{P_{1}} = \frac{V_{1}}{V_{2}}[/tex] **(1)**

Where:

[tex]P_{1}, P_{2}[/tex] - Initial and final pressure, measured in kPa.

[tex]V_{1}, V_{2}[/tex] - Initial and final pressure, measured in mililiters.

If we know that [tex]P_{1} = 100\,kPa[/tex], [tex]V_{1} = 500\,mL[/tex] and [tex]V_{2} = 1000\,mL[/tex], then the new pressure of the gas is:

[tex]P_{2} = P_{1}\cdot \left(\frac{V_{1}}{V_{2}} \right)[/tex]

[tex]P_{2} = 500\,kPa[/tex]

The new pressure of the gas is 500 kilopascals.

**2)** Let suppose that gas experiments an isothermal process. From the **Equation of State for Ideal Gases** we construct the following relationship:

[tex]\frac{P_{2}}{P_{1}} = \frac{V_{1}}{V_{2}}[/tex] **(1)**

Where:

[tex]P_{1}, P_{2}[/tex] - Initial and final pressure, measured in kPa.

[tex]V_{1}, V_{2}[/tex] - Initial and final pressure, measured in mililiters.

If we know that [tex]V_{1} = 3.60\,L[/tex], [tex]P_{1} = 10\,kPa[/tex] and [tex]P_{2} = 25\,kPa[/tex] then the new volume of the gas is:

[tex]V_{2} = V_{1}\cdot \left(\frac{P_{1}}{P_{2}} \right)[/tex]

[tex]V_{2} = 1.44\,L[/tex]

The final volume is 1.44 liters.

**3)** From the **Equation of State for Ideal Gases** we construct the following relationship:

[tex]\frac{P_{2}}{P_{1}} = \frac{V_{1}}{V_{2}}[/tex] **(1)**

Where:

[tex]P_{1}, P_{2}[/tex] - Initial and final pressure, measured in kPa.

[tex]V_{1}, V_{2}[/tex] - Initial and final pressure, measured in mililiters.

If we know that [tex]\frac{P_{2}}{P_{1}} = 3[/tex], then the volume ratio is:

[tex]\frac{V_{1}}{V_{2}} = 3[/tex]

[tex]\frac{V_{2}}{V_{1}} = \frac{1}{3}[/tex]

Volume will decrease by approximately 67 %.

**4) **The Boyle's Laws deals with pressures and volumes.

Please someone help me ...............

**Answer:**

Q58. number of moles(n) and relative formula mass(Mr)

Q59. a) 2 H2S + O2 --> 2 H2O + 2 S

b) After the balanced equation you should able to draw it yourself - I cannot draw it on here :)

**Explanation:**

Plz help! I will give brainliest.

**Answer:**

D. 0.50

**Explanation:**

Use avogadro number to find the whole work.

What is the pOH if the [OH-]= 0.165 M? What is the pH of this basic solution? *Please round your answer(s) to the appropriate number of significant figures. Your answer can be in standard notation or i letter "e" in place of x10.* 1 N

**Answer:**

78

**Explanation:**

**Answer:**

The OH would be .7825 and the basic solution is a strong base.

**Explanation:**

What you would do is -log(0.165) in your calculator which would give you 0.7825160065 as an answer. Im not sure what the significant figure is so I will not be rounding to that, but that is your answer for the first part.

The second part: because your pOH is a .7825, this would be consiered a strong base in the pOH because it is closer to 1 which is your base.

3. Identify the 4 primary pigments found in plant leaves (name and color)

Chlorophyll: green

Anthocyanins: red

Carotene: orange.

Sorry I couldn’t find the 4th one

Anthocyanins: red

Carotene: orange.

Sorry I couldn’t find the 4th one

The kinetic molecular theory, explains how particles in matter behave.

True

False

**Answer:**

true

True I seen this on my quiz

Which compounds will most likely dissociate when dissolved in water? Select all that apply.

**Answer:**

A) barium hydroxide

B) ethanol

C) glucose

D) silver nitrate

E) dichloromethane

F) postassium chloride

The other compounds ethanol and glucose are also soluble in water but do not dissociate when dissolved in water.

**Explanation:**

Please mark this Brainilest.

These compounds will **dissociate **in water:

A) barium hydroxide

D) silver nitrate

F) potassium chloride

What are ionic compounds?Manylearn more about **dissociation **here: https://brainly.com/question/305470

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How many grams are there in 9.03 x 1023 molecules of CO2?

**Answer:**

**The correct answer is - 66g.**

**Explanation:**

**Given:**

molecules of CO2 = 9.03 x 10^23

**We know:**

1 mole of any substance = 6.02x10^23 molecules. (Avogadro's number)

M (CO2) = 12 + (2x16) = 12 + 32 = 44g

Solution:

The mass of CO2 with 9.03x10^23 molecules would be:

44g of CO2 = 6.02x10^23 molecules.

So, the mass in grams of CO2 (X) = 9.03x10^23 molecules

Xg of CO2 = (44x9.03x10^23)/6.02x10^23 = 66g

Thus, the correct answer would be - 66gm.

Increasing the amount of current flowing through a wire strengthens

what?

magnetic field

electromagnetism

solenoid

O polarity

**Answer:**

It will strengthen **Electromagnetism**

Which statement best describes DNA?

(A) It can be found in every living cell.

B It can be found only in specialized

cells.

© It can be found only in cells with a

nucleus.

D It can be found only when cells are

dividing.

**Answer:**

Found in every living cell

How many particles are in one mole of copper (II) sulfate, CuSO4?

2. Avogadro’s number

A pebble is dropped into a cup of water and sinks to the bottom ofthe cup. A solid metal bead of exactly the same size is dropped into the same cup and sinks to the bottom of the cup. How do the pebble and the metal bead compare?

**Answer:**

A solid metal bead of the same size is dropped into the same cup and sinks to the bottom of the cup. How do the pebble and the metal bead compare? They both have the same mass. They are both denser than water.

**Explanation:**

nun

**Answer:**

Both the pebble and metal bead of the same mass will be equally accelerated if they are at the same place, in this case, they are in the same place meaning they will be accelerated at the same speed towards the earth. Thus even if they are in the water they will sink at the same speed and finally will reach the bottom of the cup.

what kind of chemical reaction is this?

It’s a hydrogen reaction

NH₄NO₃ → N₂O + 2H₂O When 45.70 g of NH₄NO₃ decomposes, what mass of each product is formed?

**Answer: 25.13 g of [tex]N_2O[/tex] and 20.56 g of [tex]H_2O[/tex] will be produced from 45.70 g of [tex]NH_4NO_3[/tex]**

**Explanation:**

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of} NH_4NO_3=\frac{45.70g}{80.04g/mol}=0.571moles[/tex]

The balanced chemical equation is:

[tex]NH_4NO_3\rightarrow N_2O+2H_2O[/tex]

According to stoichiometry :

1 mole of [tex]NH_4NO_3[/tex] produce = 1 mole of [tex]N_2O[/tex]

Thus 0.571 moles of [tex]NH_4NO_3[/tex] will require=[tex]\frac{1}{1}\times 0.571=0.571moles[/tex] of [tex]N_2O[/tex]

Mass of [tex]N_2O=moles\times {\text {Molar mass}}=0.571moles\times 44.01g/mol=25.13g[/tex]

1 mole of [tex]NH_4NO_3[/tex] produce = 2 moles of [tex]H_2O[/tex]

Thus 0.571 moles of [tex]NH_4NO_3[/tex] will require=[tex]\frac{2}{1}\times 0.571=1.142moles[/tex] of [tex]H_2O[/tex]

Mass of [tex]H_2O=moles\times {\text {Molar mass}}=1.142moles\times 18g/mol=20.56g[/tex]

**Thus 25.13 g of [tex]N_2O[/tex] and 20.56 g of [tex]H_2O[/tex] will be produced from 45.70 g of [tex]NH_4NO_3[/tex]**

Describe a time in the group discussion when you referred to the notes you took, the graphic organizer you filled out, and your position paper.

**Answer:**

To back up any statements I make.

To refute any errors presented.

**Explanation:**

During a group discussion, you** look at your notes** to** point out an error **or when you want to **flesh out a point **you made.

The term **group discussion** has to do with learners** talking about a topic** in a manner ion which each learner takes a turn to explain a portion of the topic.

During a group discussion, you** look at your notes** to** point out an error **or when you want to **flesh out a point **you made.

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2.50 L of gas originally at 50 K is warmed to 80 K. If the pressure remains constant, which gas law needs to be used to find the new volume?

Select one:

a.Charles law

b.Gay-Lussac’s law

c.Boyle’s law

d.Combined gas law

A. Charles law because The volume and temp of a gas at constant pressure are directly proportional to each other:

The Earth has how many satellites?

(i know this is not chemistry theres no science one)

3,000 operational satellites currently orbiting earth

**Answer:**

Well it depends, There are THOUSANDS of inactive satellites. Even scientists don't know how many as for active ones there is about 1 957 according to nasa

**Explanation:**

is butanoic acid a hydrocarbon?

Carboxylic acids are derivatives of hydrocarbons in which one or more of the hydrogen atoms in the hydrocarbon have been replaced by a carboxyl group.

Yes butanoic acid is a hydrocarbon.

Yes butanoic acid is a hydrocarbon.

The force that is pulling down on a person or object on the surface of the Earth is

called (attraction of matter to matter)?

normal force

mass

weight

gravity

This is gravity.

Have a good day/night

Have a good day/night

- Calculate the median and rangeof the data in the dot plot. Thencompare the results to the dotplot for Exercise in Example 2.
Not sure how to find angle C
Eliza estimated she would spend $120 at the grocery store. She actually spent $95. What is the percent error?
1)Ahmad does a statistical experiment.He throws a dice 600 times.He scores one, 200 times.Is the dice fair? Explain your answer
hello help please ill mark brainliest!!!
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