**Answer:**

G is correct option:

# of Ba atoms = coefficient 4 × subscript 1= 4

**Explanation:**

**Formula:**

4Ba(OH)₂

G is correct option:

# of Ba atoms = coefficient 4 × subscript 1= 4

Because there are only 4 atoms of Ba in given formula.

Ba(OH)₂ contain one atom of Ba while in question there are 4 moles of Ba(OH)₂ present thus total 4×1 = 4 atoms of Ba present.

Other options are incorrect. Because,

F:

# of Ba atoms = coefficient 4 + subscript 1 = 5

This shows given formula contain 5 Ba atoms. So it is incorrect.

H:

# of Ba atoms = subscript 4 × coefficient 2 = 6

This shows that subscript is 4 which is incorrect because coefficient is 4 and subscript is 1.

j:

# of Ba atoms = subscript 1 + coefficient 1 = 2

This option shows that subscript is one which is correct but coefficient is incorrect. The coefficient of Ba is 4 and coefficient is always multiply with subscript not added. So this option is also incorrect.

Which of the following is NOT a strong electrolyte?

:

Answers:

Na2SO4

KI

CaCl2

LiOH

C6H1206

**Answer:**

C6H1206

**Explanation:**

C6H12O6 is a monomer of carbohydrates also known as glucose, so it is not an electrolyte at all.

One way to represent a substance is with a chemical formula. In the formula CO2, what do the symbols Cand o refer to?

**Answer:**

C is for carbon and O is for oxygen

C reference carbon and O reference oxygen

How to separate given mixture?

**Answer:**

Chromatography involves solvent separation on a solid medium.

Distillation takes advantage of differences in boiling points.

Evaporation removes a liquid from a solution to leave a solid material.

Filtration separates solids of different sizes.

**Explanation:**

Which option BEST explains how thermal equilibrium interacts with heat transfer between particles?

a

Thermal equilibrium stops the transfer of energy in just one direction when both objects reach the same temperature, but allows their particles to continue transferring that energy back and forth.

b

Thermal equilibrium always transfers energy from the hotter object to the colder one, and increases the energy and speed of moving particles in both objects as the temperature decreases.

c

Thermal equilibrium helps the transfer of energy between the particles of some materials better than others, but always stops the transfer of energy in materials like plastic and wood.

d

Thermal equilibrium quickly transfers energy back to the particles of the object that was originally hotter, and requires that the particles in both objects have reached equal energy and density.

**Answer:**

Thermal equilibrium stops the transfer of energy in just one direction when both objects reach the same temperature, but allows their particles to continue transferring that energy back and forth.

**Explanation:**

**a. **The transfer of energy occurs until both objects reach thermal equilibrium. But particles are always moving and crashing with each other. **TRUE.**

** **

**b.** The heat transfer occurs from the hotter object to the colder one but moving of particles descreases with temperature decreasing. **FALSE.**

**c. **Plastic and wood have a poor quality to transfer energy but there is no material that "stops" perfectly the transfer of energy. **FALSE.**

**d. **The heat is transferred from the particles of the hotter object to the particles of the colder one. **FALSE**

Scientists are experimenting with pure samples of isotope X which is radioactive. The sample has a mass of 20. Grams. The half-life was measured to be 232 seconds. There is a second sample that weighs 80 grams. What is the half-life of the second sample

**Answer:**

**Explanation:**

Half life of radioactive materials do not depend upon the mass of the material . It only depends upon the nature of radioactive materials . The half life of 20 g is 232 seconds . That means 20 gram will be reduced to 10 gram in 232 seconds .

Half life of 80 gram is also 232 seconds . So , 80 gram will be reduced to 40 gram in 232 second .

A sample of an unknown gas weighs 0.419 grams and produced 5.00L of gas at 1.00atm (unknown gas only) and 298.15K, what is the molar mass (g/mole) of this unknown gas

**Answer:**

**molar mass of unknown gas = 1.987 g/mol**

**Explanation:**

First, the number of moles of the unknown gas is found

Using the ideal gas equation: PV = nRT

P = 1.00 atm, V = 5.00 L, T = 298.15 K, R = 0.082 L.atm.mol⁻¹K⁻¹

n = PV/RT

n = (1.00 atm * 5.00 L)/(298.15 K *0.082 L.atm.mol⁻¹K⁻¹)

n = 0.2109 moles

Molar mass = mass/ number of moles

molar mass = 0.419 g/ 0.2109 mols

**molar mass of unknown gas = 1.987 g/mol**

The **molar mass** of unknown gas by using** ideal gas equation** = 1.987 g/mol.

This equation gives the relation between pressure, volume, temperature as given below:

[tex]PV = nRT[/tex]

P = 1.00 atm, V = 5.00 L, T = 298.15 K, R = 0.082 L.atm.mol⁻¹K⁻¹

Substitute the above values in the above equation as follows:

n = (1.00 atm * 5.00 L)/(298.15 K *0.082 L.atm.mol⁻¹K⁻¹)

n = 0.2109 moles

Formula for molar mass[tex]Molar mass = mass/ number of moles[/tex]

Calculate **molar mass** by using the above equation,

molar mass = 0.419 g/ 0.2109 moles

The molar mass of unknown gas = 1.987 g/mol

Find more information about **ideal gas equation** here,

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calculate the mass of N2 gas which has a volume 0.227 at STP

Hi I just wanted you know I have to work at the gym I will call when you I have a good night love I will

Which of these is the best definition of biotechnology??

A) The study of chemical processes in living things

B) the use and application of living things and science

C) the application of engineering principles to solve medical problems

D) the study of forces

C most likely sorry if I’m wrong

I believe the answer is B) the use and application of living things and science.

Bio means life and technology is scientific knowledge for different purposes.

Sorry if this is wrong

Bio means life and technology is scientific knowledge for different purposes.

Sorry if this is wrong

The smallest unit of an element that can exist either alone or in combination with other such particles of the same or different elements is the

А.

electron

B

proton

neutron

D

atom

**Answer:**

The answer is D - Atom

The smallest unit of an** element** that can exist either alone or in combination with other such particles of the same or different elements is the **atom.**

What is an atom?

An** atom** is defined as the smallest unit of** matter **which forms an **element**. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The** protons **are positively charged and **neutrons** are neutral and hence the nucleus is positively charged. The** electrons **which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of **sub- atomic particles **which on combination do not alter the **chemical properties **of the substances.

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The smallest form of matter that still retains the properties of an element

**Answer:**

atom

**Explanation:**

the atom is the smallest form.

Although there are smaller forms of matter (subatomic quarks, photons, electrons) an atom is the smallest that a form of matter could be that still possesses the properties of that element. An atom is classified into being a certain element based on how many protons it has.

Which of the following is a good definition of matter?

O A. Anything that is made up of light and gravity

O B. Anything that has mass and takes up space

O C. Anything that produces heat and mass

O D. Anything that has energy and creates heat

**Answer:**

B

**Explanation:**

I did the question before and got it right.

Answer :

B

Explanation:

I got it right on my test.

B

Explanation:

I got it right on my test.

for the following reaction, provide the missing information

Answer:

19. Option B. ⁰₋₁B

20. Option D. ²¹⁰₈₄Po

Explanation:

19. ²²⁸₈₈Ra —> ²²⁸₈₉Ac + ʸₓZ

Thus, we can determine ʸₓZ as follow:

228 = 228 + y

Collect like terms

228 – 228 = y

y = 0

88 = 89 + x

Collect like terms

88 – 89 = x

x = –1

Thus,

ʸ ₓZ => ⁰₋₁Z => ⁰₋₁B

²²⁸₈₈Ra —> ²²⁸₈₉Ac + ʸₓZ

²²⁸₈₈Ra —> ²²⁸₈₉Ac + ⁰₋₁B

20. ᵘᵥX —> ²⁰⁶₈₂Pb + ⁴₂He

Thus, we can determine ᵘᵥX as follow:

u = 206 + 4

u = 210

v = 82 + 2

v = 84

Thus,

ᵘᵥX => ²¹⁰₈₄X => ²¹⁰₈₄Po

ᵘᵥX —> ²⁰⁶₈₂Pb + ⁴₂He

²¹⁰₈₄Po —> ²⁰⁶₈₂Pb + ⁴₂He

When does carbon dioxide absorb the most heat energy?

during freezing

during deposition

during sublimation

during condensation

During sublimation

This has been posted on here before so you could’ve searched it lol.

Best of luck :))

This has been posted on here before so you could’ve searched it lol.

Best of luck :))

**Answer:**

during sublimation

**Explanation:**

just took the test

What is the Kc equilibrium-constant expression for the following equilibrium? S8(s) + 24F2(g) 8SF6(g)

**Answer:**

[tex]Kc=\frac{[SF_6]^8}{[F_2]^2^4}[/tex]

**Explanation:**

Hello.

In this case, for the undergoing chemical reaction:

[tex]S_8(s) + 24F_2(g) \rightleftharpoons 8SF_6(g)[/tex]

We consider the law of mass action in order to write the equilibrium expression yet we do not include S8 as it is solid and make sure we power each gaseous species to its corresponding stoichiometric coeffient (24 for F2 and 8 for SF6), thus we obtain:

[tex]Kc=\frac{[SF_6]^8}{[F_2]^2^4}[/tex]

Best regards!

How many moles of precipitate will be formed when 100.0 mL of 0.200 M NaBr is reacted with excess Pb(NO₃)₂ in the following chemical reaction?

2 NaBr (aq) + Pb(NO₃)₂ (aq) → PbBr₂ (s) + 2 NaNO₃ (aq)

**Answer : The number of moles of precipitate, [tex]PbBr_2[/tex] formed will be 0.01 moles.**

**Explanation : Given,**

Concentration of NaBr = 0.200 M

Volume of solution = 100.0 mL = 0.1 L (1 L = 1000 mL)

**First we have to calculate the moles of NaBr.**

[tex]\text{Moles of NaBr}=\text{Concentration of NaBr}\times \text{Volume of solution in L}[/tex]

[tex]\text{Moles of NaBr}=0.200M\times 0.1L=0.02mol[/tex]

**Now we have to calculate the moles of precipitate, [tex]PbBr_2[/tex] formed.**

**The balanced chemical reaction is:**

[tex]2NaBr(aq)+Pb(NO_3)_2(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)[/tex]

From the balanced chemical reaction we conclude that:

As, 2 moles of NaBr react to give 1 mole of [tex]PbBr_2[/tex]

So, 0.02 moles of NaBr react to give [tex]\frac{0.02}{2}=0.01[/tex] mole of [tex]PbBr_2[/tex]

**Therefore, the number of moles of precipitate, [tex]PbBr_2[/tex] formed will be 0.01 moles.**

The **number of mole **of the **precipitate (i.e PbBr₂)** formed when **100** **mL** of **0.2 M NaBr** react with **excess Pb(NO₃)₂** is **0.01 mole**

Volume = 100 mL = 100 / 1000 = 0.1 L

Molarity of NaBr = 0.2 M

Mole of NaBr =?Mole = Molarity x Volume

Mole of NaBr = 0.2 × 0.1

Mole of NaBr = 0.02 mole2NaBr(aq) + Pb(NO₃)₂(aq) → PbBr₂(s) + 2NaNO₃ (aq)

From the **balanced equation **above,

**2 moles** of **NaBr** reacted to produce **1 mole** of **PbBr₂.**

Therefore,

**0.02 mole** of **NaBr** will react to produce = [tex]\frac{0.02}{2} \\\\[/tex] = **0.01 mole of PbBr₂. **

Thus, the **number of mole** of the **precipitate (i.e PbBr₂)** produced from the **reaction** is **0.01 mole**

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How do the test variables (independent variables) and outcome variables (dependent variables) in an experiment compare? A. The test variables (independent variables) and outcome variables (dependent variables) are the same things. B. The test variable (independent variable) controls the outcome variable (dependent variable). C. The test variable (independent variable) and outcome variable (dependent variable) have no affect on each other. D. The outcome variable (dependent variable) controls the test variable (independent variable).

**Answer:**

I'm on the exact same queston

**Answer:**

The test variable (independent variable) controls the outcome variable (dependent variable)

**Explanation:**

its right on study island

The empirical formula of CBr2 has a molar mass of 515.46 g/mol. What is the molecular formula of this

compound

Answer:

C3Br6

Explanation:

C= (1 X 12.011) = 12.011

Br= (2 X 79.904)= 159.808

159.808+12.011 = 171.819

515.46 divided by 171.819 = 3.00

so you mulitpy CBr2 by 3 which gives you C3Br6

What types of materials are better at absorbing energy from radiation?

**Answer:**

**Explanation:**

Materials are clothes and heavy rope

True or False: Particles that are moving faster have a higher temperature

**Answer:**

true

**Explanation:**

I'm not sure why cause I dont know how to explain but it's TRUE

**Answer:**

True

**Explanation:**

The particles moving faster in a substance the hotter it gets.

What happens when the elements in group 2 react with water?

**Answer:**

The Group 2 metals become more reactive towards the water as you go down the Group.

**Explanation:**

These all react with cold water with increasing vigour to give the metal hydroxide and hydrogen. ... You get less precipitate as you go down the Group because more of the hydroxide dissolves in the water. Summary of the trend in reactivity.

**Please mark me brainliest! hope this helped!**

**God bless!**

SOMEONE PLEASE HELPPP

A is the correct awnser Beacuse it ether right kne

If 25.6 mL isopropyl alcohol fully decomposes, what mass of H2 is formed? The density of isopropyl alcohol is 0.785 g/mL. g

**Answer:**

The correct answer is **0.67 g H₂**

**Explanation:**

Isopropyl alcohol (C₃H₇OH) can decompose to give acetone (C₂H₆OH) and hydrogen gas (H₂) according to the following chemical equation:

**C₃H₇OH (g) ⇒ C₂H₆CO(g) + H₂(g)**

We can calculate the initial mass of isopropyl alcohol from the density and volume data:

density = m/V = 0.785 g/mL

⇒ m = density x V = 0.785 g/mL x 25.6 mL = **20.096 g** **C₃H₇OH**

According to the chemical equation 1 mol of C₃H₇OH gives 1 mol H₂. The molar mass of C₃H₇OH is:

molar mass C₃H₇OH = (12 g/mol x 3) + (1 g/mol x 7) + 16 g/mol + 1 g/mol = 60 g/mol

molar mass H₂ = 1 g/mol x 2 = 2 g/mol

So, we obtain: **2 g H₂ from 60 g C₃H₇OH**. We multiply this stoichiometric ratio (2 g H₂/60 g C₃H₇OH) by the initial mass of C₃H₇OH to obtain the mass of H₂ is formed:

20.096 g C₃H₇OH x (2 g H₂/60 g C₃H₇OH) = 0.6698 g ≅ **0.67 g H₂**

help me please loves

**Answer:**

K and ba

**Explanation:**

**Answer: K and Ba**

**Explanation:**

A sample of propane, C3H8, contains 13.8 moles of carbon atoms. How many total moles of atoms does the sample contain

**Answer:**

[tex]Total = 50.6\ moles[/tex]

**Explanation:**

**Given**

[tex]Propane = C_3H_8[/tex]

**Represent Carbon with C and Hydrogen with H**

[tex]C = 13.8[/tex]

**Required**

Determine the total moles

**First, we need to represent propane as a ratio**

[tex]C_3H_8[/tex]** **implies

[tex]C:H = 3:8[/tex]

So, we're to first solve for H when [tex]C = 13.8[/tex]

**Substitute 13.8 for C**

[tex]13.8 : H = 3 : 8[/tex]

**Convert to fraction**

[tex]\frac{13.8}{H} = \frac{3}{8}[/tex]

**Cross Multiply**

[tex]3 * H = 13.8 * 8[/tex]

[tex]3 H = 110.4[/tex]

**Solve for H**

[tex]H = 110.4/3[/tex]

[tex]H = 36.8[/tex]

**So, when **

[tex]C = 13.8[/tex]

[tex]H = 36.8[/tex]

[tex]Total = C + H[/tex]

[tex]Total = 13.8 + 36.8[/tex]

[tex]Total = 50.6\ moles[/tex]

Which of the following is an Elementary compound?

A. CO2

B. N2

C. SO2

D. H2S

heeeeeeeeeelp please please please

Answer:

Explanation:

In my opinion the answer should be SO2

**Answer:**

a should be answer i think.

Question 11

4 pts

Using the formula 2H202 --> 2H2O + O2, if 7.30 moles of peroxide are

decomposed, how many moles of oxygen will be formed?

**Answer:**

3.65 mol O₂

**Explanation:**

Step 1: RxN

2H₂O₂ → 2H₂O + O₂

Step 2: Define

Given - 7.30 mol H₂O₂

Solve - x mol O₂

Step 3: Stoichiometry

[tex]7.30 \hspace{3} mol \hspace{3} H_2O_2(\frac{1 \hspace{3} mol \hspace{3} O_2}{2 \hspace{3} mol \hspace{3} H_2O_2} )[/tex] = 3.65 mol O₂

Which of the following evidence supports the theory of plate tectonics

The theory of plate tectonics states that the Earth's solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle.,Thus, at divergent boundaries, oceanic crust is created that’s what plate tectonics means hoped that helped

**Answer:**

seafloor spreading

**Explanation:**

i took the test

What can the chemical formula tell us about a compound?

**Answer:**

A chemical formula tells us the number of atoms of each element that is in a compound. It contains the symbols of the atoms for the elements present in the compound as well as how many there are for each element in the form of subscripts.

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A chemist decomposes samples of several compounds; the masses of their constituent elements are listed. Calculate the empirical formula for each compound.

a. 1.245 g Ni, 5.381 g I,

b. 2.677 g Ba, 3.115 g Br,

c. 2.128 g Be, 7.557 g S, 15.107 g

**Answer:**

you can see the empirical formula at the pic

The **empirical formula **for compound (a) is **NiI2**, (b) is **BaBr2 **and (c) is **BeS.**

**Empirical formula **of a **compound **is defined as the **simplest whole number **ratio of **atoms **present in a **compound**.

(a) 1.245 g Ni : 5.381 g I

Mole of Ni ; Mole of I = 1.245/59 : 5.381/127 = 0.02 : 0.04 = 1:2

So the formula is NiI2

(b) 2.677 g Ba : 3.115 g Br

Mole of Ba : Mole of Br = 2.677/137 : 3.115/60 = 0.019 : 0.038

= 0.02 : 0.04 = 1:2

So the formula is BaBr2

(c) 2.128 g Be : 7.557 g S

Mole of Be : Mole of S = 2.128/9 : 7.557/32 = 0.2 : 0.2 = 1:1

So the formula is BeS

Thus, **empirical formula **for compound (a) is **NiI2**, (b) is **BaBr2 **and (c) is **BeS.**

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Is air a homogeneous heterogeneous mixture or substance￼

**Answer:**

look at the explanation

**Explanation:**

The air that you breathe is a homogeneous mixture of oxygen, nitrogen, argon, and carbon dioxide, along with other elements in smaller amounts. Because each layer of the Earth's atmosphere has a different density, each layer of air is its own homogeneous mixture.

Hope this helps. :)

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2. Express each of the following percentages asa decimal.(a) 4%(b) 633%
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Rachel earned $ 34 $34dollar sign, 34 in 4 44 hours at her job today. She wants to know how much she could earn ( e ) (e)left parenthesis, e, right parenthesis tomorrow if she works 10 1010 hours at the same hourly rate. How much will Rachel earn in 10 1010 hours? $
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What is the capital of N. Ireland?
The power generated by an electrical circuit (in watts) as a function of its current x xx (in amperes) is modeled by P ( x ) = 15 x ( x 8 ) P(x)=15x(x8)P, left parenthesis, x, right parenthesis, equals, minus, 15, x, left parenthesis, x, minus, 8, right parenthesis What current will produce the maximum power?
what has the U.S customs created to force importing companies like wal-mart to provide more detailed information about
Which of the following is both a perfect square and a perfect cube?6416811,000I know the answer is 64, but how? Can someone please explain me to me how to work this out?
Demarco and Janine Jackson have been married for 20 years and have four children who qualify as their dependents (Damarcus, Janine, Michael, and Candice). The couple received salary income of $100,000 and qualified business income of $10,000 from an investment in a partnership, and they sold their home this year. They initially purchased the home three years ago for $200,000 and they sold it for $250,000. The gain on the sale qualified for the exclusion from the sale of a principal residence. The Jacksons incurred $16,500 of itemized deductions, and they had $3,550 withheld from their paychecks for federal taxes. They are also allowed to claim a child tax credit for each of their children. However, because Candice is 18 years of age, the Jacksons may only claim the child tax credit for other qualifying dependents for Candice. (Use the tax rate schedules.)Comprehensive Problem 4-55 Parts-c through fa. What would their taxable income be if their itemized deductions totaled $28,000 instead of $16,500?b. What would their taxable income be if they had $0 itemized deductions and $6,000 of for AGI deductions?c. Assume the original facts but now suppose the Jacksons also incurred a loss of $5,000 on the sale of some of their investment assets. What effect does the $5,000 loss have on their taxable income?
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How did Winston Churchill die?
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At 7:00 one Summer morning Harry and Hermione hopped into their speedy more motorboat and left Hogwarts dock. They arrived at Dumbledore Wharf 35 minutes later. During the busy summer months a car ferry departs from Dumbledore wharf every five minutes. Tourists crowd onto the ferry for the 55 minute ride to Hogswarts dock. If Harry and Hermione followed the route that the car ferries take, how many car ferries did they see on their trip?
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Name for each compoud1.CO2.H2SO43CaCO34 H2025NaF