**Explanation:**

I don't understand the question

**Answer:**

Reported speech is often called indirect speech. Reported speech is the speech in which someone says that someone told something.

For example:

1. The English teacher said that she would take our test on Monday.

2. Mr. James said that he was not feeling well due to dry weather.

Did you observe the tense of the reported speech? It is in past form. In reported speech always use past tense.

17. The equation below represents a chemical reaction that occurs in living cells.

CoH1206 + 602 -- 6002 + 6H20 + energy

How many atoms are represented in the reactants of this equation?

**Answer:**

36 atoms

**Explanation:**

**The reactants are in the left side of the equation**. First we determine how many atoms are there in the C₆H₁₂O₆ molecule:

There are two atoms in a O₂ molecule, and there are 6 O₂ molecules in the equation:

2 * (6 O atoms) = 12 atoms in totalThe total number of atoms in the reactants is

24 + 12 = 36 atomsIs carbonic acid (H2CO3) soluble in water?

**Answer:**

it is soluble in water

**Explanation:**

mark brainliest pliiz cutee:)

Yes it is soluble in water

How many moles of solute are in 53.1 mL of 12.5M HCI?

Molarity = moles of solute/volume of solution in liters.

From this relation, we can figure out the number of moles of solute by multiplying the molarity of the solution by the volume in liters.

We have 53.1 mL, or 0.0531 L, of a 12.5 M, or 12.5 mol/L, solution. Multiplying 12.5 mol/L by 0.0531 L, we obtain 0.664 moles. So, in this volume of solution, there are 0.664 moles of solute (HCl).

From this relation, we can figure out the number of moles of solute by multiplying the molarity of the solution by the volume in liters.

We have 53.1 mL, or 0.0531 L, of a 12.5 M, or 12.5 mol/L, solution. Multiplying 12.5 mol/L by 0.0531 L, we obtain 0.664 moles. So, in this volume of solution, there are 0.664 moles of solute (HCl).

Investigation Question: How do organisms get their genes?

THIS ANSWER SHOULD BE 3 OR MORE SENTENCES.

**Answer:**

from the chromosome..l dont know

Genetic information is passed from generation to generation through inherited units of chemical information (in most cases, genes). Organisms produce other similar organisms through sexual reproduction, which allows the line of genetic material to be maintained and generations to be linked.

1.1

Which of these is NOT an intermolecular force?

A

Covalent bonding

B

Hydrogen bonding

с

London / dispersion forces

Dipole - dipole forces

1.2

London forces are found between ...

A two polar molecules.

B two non-polar molecules.

C a polar molecule and a non-polar molecule.

Da polar molecule and an ionic substance.

(2

1.3 Which of the following compounds have a shape that can be described as

trigonal bipyramidal?

A

CH4

B

PCL5

с

SF6

D

BF3

(2)

1.4

Which of the following have the same molecular geometry?

CO2, H20, BeCl2 and N20

A

CO2, BeCl2 and N2O

B

H20 and N20 only

C

H20, BeCl2 and CO2

CO2 and N20 only

(2)

**Answer:**

1.1) Covalent bonding

**Explanation:**

All of the above are intermolecular forces except covalent, which is intramolecular.

What is the formula for sodium selenide?

The formula for sodium selenide is Na2Se

An ideal gas in a sealed container has an initial volume of 2.80 L. At constant pressure, it is cooled to 18.00 °C, where its

final volume is 1.75 L. What was the initial temperature?

Ti =

'c

**Answer:**

[tex]T_1=-91.18\°C[/tex]

**Explanation:**

Hello there!

In this case, given the T-V variation, we understand it is possible to apply the Charles' law as shown below:

[tex]\frac{T_1}{V_1}= \frac{T_2}{V_2}[/tex]

Thus, since we are interested in the initial temperature, we can solve for T1, plug in the volumes and use T2 in kelvins:

[tex]T_1= \frac{T_2V_1}{V_2}\\\\T_1= \frac{(18.00+273.15)K(1.75L)}{(2.80L)}\\\\T_1=182K-273.15\\\\T_1=-91.18\°C[/tex]

Best regards!

how many liters of 0.150 m hcl would be required to react completely with 8.00 grams of magnesium hydroxide

**Answer:**

**Explanation:**

please give me brainlist and follow

N2 + 3H2 → 2NH3

How many moles of hydrogen, H2, are needed to react with 3.5 moles of nitrogen, N2?

**Answer:**

10.5 got it!!!!

how is acid different from base

Hehsnsgx d she. Wayy buy is s

As

As

what are twin primes between 1 to 100

The twin primes between 1 and 100 are; (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), (71, 73). Hope this helped<3

What must happen in order for water to change state?

A. It must maintain its thermal energy level.

B. It must absorb or release energy.

C. It must be insulated.

D. It must convert thermal energy to solar energy.

**Answer:**

B

**Explanation:**

if it releases energy it becomes a solid(Solid)

if it absorbs energy it becomes a gas(Water Vapor)

URGENT PLZ HELP

Which of the following statements is true?

a. In an endothermic process heat is transferred from the surroundings to the

system.

b. In an exothermic process heat is transferred from the surroundings to the

system.

C. The surroundings will feel cooler in an exothermic process.

d. The surroundings will feel warmer in an endothermic process.

Answer:

A.

Explanation:

In an endothermic reaction heat is applied.

In an **endothermic process**, heat is transferred from the surroundings to the system.

**What are endothermic and exothermic processes?**

An **exothermic process** is one that gives off heat. This heat is transferred to the surroundings. **An endothermic process** is one in which heat has to be supplied to the system from the surroundings.

The **endothermic process** is a term that describes a reaction where the system absorbs the energy from its surrounding in the form of heat. A few examples of the endothermic process are **photosynthesis, evaporating liquids, melting ice**, etc.

The **exothermic reaction **is the opposite of an endothermic reaction. It releases energy by light or heat to its surrounding. A few examples are **neutralization, burning of a substance, reactions of fuels**, etc.

Hence, option A is the correct answer.

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plz, help me I'm so confused!

(this is also science)

**Answer:**

Well, there is no photo...

**Explanation:**

Provide a balanced molecular equation, total ionic, and net ionic equation for sodium phosphate and zinc acetate.

**Answer: Balanced molecular equation :**

[tex]2Na_3PO_4(aq)+3(CH_3COO)_2Zn(aq)\rightarrow 6CH_3COONa(aq)+Zn_3(PO_4)_2(s)[/tex]

**Total ionic equation: **

[tex]6Na^+(aq)+3PO_4^{2-}(aq)+6CH_3COO^-(aq)+3Zn^{2+}(aq)\rightarrow 6CH_3COO^-(aq)+6Na^+(aq)+Zn_3(PO_4)_2(s)[/tex]** **

**The net ionic equation: **

[tex]2PO_4^{3-}(aq)+3Zn^{2+}(aq)\rightarrow Zn_3(PO_4)_2(s)[/tex]

**Explanation:**

Complete ionic equation : In complete ionic equation, all the substances that are strong electrolyte are present in an aqueous state as ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

When sodium phosphate and zinc acetate then it gives zinc phosphate and sodium acetate as product.

The balanced molecular equation will be,

[tex]2Na_3PO_4(aq)+3(CH_3COO)_2Zn(aq)\rightarrow 6CH_3COONa(aq)+Zn_3(PO_4)_2(s)[/tex]

The total ionic equation in separated aqueous solution will be,

[tex]6Na^+(aq)+2PO_4^{3-}(aq)+6CH_3COO^-(aq)+3Zn^{2+}(aq)\rightarrow 6CH_3COO^-(aq)+6Na^+(aq)+Zn_3(PO_4)_2(s)[/tex]

In this equation, and are the spectator ions.

By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.

The net ionic equation will be,

[tex]2PO_4^{3-}(aq)+3Zn^{2+}(aq)\rightarrow Zn_3(PO_4)_2(s)[/tex]

The following substances dissolve when added to water. Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution. Drag the appropriate items to their respective bins. Not all bins may contain an item and some bins may contain multiple items.NH3 AlBr3 CH3OH AlCl

**Answer:**

NH3 ------dipole - dipole forces

CH3OH ------ dipole - dipole forces

AlBr3 ------- ion - dipole forces

AlCl3 ------- ion - dipole forces

**Explanation:**

Let us recall that water is a polar molecule. This means that water has a positive as well as a negative end. NH3 also has a dipole. The interaction between solute and solvent dipoles leads to the dissolution of NH3 in water. Hence the strongest intermolecular force here is dipole - dipole forces.

Similarly, CH3OH possesses a polar -O-H group which can interact with water via dipole - dipole interaction as its strongest intermolecular force.

As for AlBr3 and AlCl3, the two substances dissociate into ions in solution and these ions interact with the dipole in water via ion - dipole interaction as its strongest intermolecular interaction.

**Answer:**

Ammonia [tex]NH_3[/tex]

Aluminium Chloride [tex]AlCl[/tex]

Methanol [tex]CH_3OH[/tex]

Aluminium bromide [tex]AlBr_3[/tex]

**Explanation:**

Because water is not in **ionic **form it can only forms **dipole **forces which are strongest. Methanol, Ammonia and AlCl are also **dipoles **not **ions **. Thus dipole **dipole **forces exist.

On the other hand, aluminium bromide are **ionic **and it can forms ion **dipole **bonds with water.

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Convert 6.62 X 10^23 atoms to moles

**Answer:**

1.099

**Explanation:**

Hope this helps

**Answer:**

1.09944660051578e-23

**Explanation:**

I have to make question longer this question

(Answer the question all the way at the bottom)

\

Do you breathe air?

**Answer:**

Of course I breathe air.

**Explanation:**

I'm not a fish.

**Answer:**

[tex]ummmmmmm \: yes \: [/tex]

What chemical test to differentiate propane and propene

**Answer:**

If you add bromine water, an aqueous solution of bromine, to the test tubes, you can tell which is propene, the alkene. The bromine reacts with and saturates the double bonds in alkenes, and so decolourises.

please give **brainly**

Using bromine water..the bromine will react with double bond in propene so it will decolourise the bromine water

The electric field around a positive charge will:

The electric field of a positively charged particle points radially away from the charge.

Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 133 mL of ethanol?

Given:

[tex]V = \text{133 mL}[/tex]

[tex]\rho = \text{0.789 g/mL}[/tex]

Required:[tex]m[/tex]

Solution:[tex]\rho = \frac{m}{V}[/tex]

[tex]m = \rho V[/tex]

[tex]m = (\text{0.789 g/mL})(\text{133 mL})[/tex]

[tex]\boxed{m = \text{105 g}}[/tex]

**Ethanol **is a common laboratory solvent and has a density of 0.789 g/mL. **105g **is the mass, in grams, of 133 mL of ethanol.

In physics, **mass **is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of **matter's **resistance to changing its speed or location in response to the force that is applied. The change caused by a force applied is smaller the more mass a body has.

The kilogram, which would be specified as equivalent to 6.62× 10³⁴ joule second in terms of Planck's constant, is the unit of **mass **inside the International Units System (SI).

**density = mass / volume**

mass =density× volume

= 0.78× 1.33

=**105g**

Therefore, **105g** is the **mass**.

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LEVEL 3

Write the correct order

of letters to the finish line.

A E B E C

Example:

ABCGH

G

H

N

eza

Not correct

ANSWER - AEGHNZ (is that right?

look this is on quizlet

how many grams are in 6.8L of Oxygen gas (O2) at STP

**Answer:**

**9.7 g**

**Explanation:**

From the question,

Note: The molar volume of all gas at stp is 22.4 dm³ or 22.4 L

1 mol of oxygen gas (O₂) at stp = 22.4 dm³

X mole of oxygen gas (O₂) at stp = 6.8 L

X = (1 mol×6.8 L)/22.4 L

X = 0.3036 mol.

But,

Number of mole (n) = mass (m)/molar mass (m')

n = m/m'

m = n×m'.................. Equation 2

Where n = 0.3036 mol, m' = 32 g/mol

Substitute into equation 2

m = 0.3036×32

m = 9.7 g

A dilute solution of hydrofluoric acid has a volume of 3.0 L and a molarity of 3.0

M. If the original solution had a volume of 2.0L, what was the initial molarity?

**Answer:**

4.5M

**Explanation:**

The solution was diluted from 2.0L to 3.0L, the dilution factor was:

3.0L / 2.0L = 1.5.

That means the solution was diluted 1.5 times.

As the final molarity of the diluted solution is 3.0M, the initial molarity of the solution was:

3.0M * 1.5 =

4.5M is the molarity of the original solutionIf a sample of oxygen gas has a pressure of 810 torr at 298 K, what will be its pressure if its temperature is raised to 330K?

**Answer:**

The pressure is = 897 torr

Explanation:

We use Gay Lussac's Law.

There are 3 gases in a container, methane has a partial pressure of 1.23 atm, ethane's partial pressure is 1.48 atm and an unknown pressure of propane. The pressure in the container was measure to be 4.43 atm. What is the partial pressure of propane?

A) 1.72

B) 1.35

C) 1.69

D) 1.53

**Answer:**

A) 1.72 atm

**Explanation:**

Dalton's Law of Partial Pressures

[tex]P_{t} = P_{1} + P_{2} + P_{3} ....[/tex]

4.43 atm = 1.23 atm + 1.48 atm + x

x = 4.43 atm - (1.23 atm + 1.48 atm)

**x = 1.72 atm**

How is gravity an attractive force?

Gravitational force -an attractive force that exists between all objects with mass; an object with mass attracts another object with mass; the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects.

an attractive force that exists between all objects with mass Because mass is always positive. There are different notions of mass, but they're equivalent. ... The masses in Newton's law of gravitation, F=Gm1m2r2, are gravitational masses.

1. The octane present in gasoline burns according to the following equation:

2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

(a) How many moles of O2 are needed to react fully with 27.5 moles of octane?

**Answer:**

[tex]n_{O_2}=343.75molO_2[/tex]

**Explanation:**

Hello there!

In this case, according to the combustion of octane:

[tex]2C_8H_1_8+25O_2\rightarrow 16CO_2+18H_2O[/tex]

We can see there is a 2:25 mole ratio of octane to oxygen; therefore, we can calculate the moles of oxygen via the following stoichiometric factor:

[tex]n_{O_2}=27.5molC_8H_1_8*\frac{25molO_2}{2molC_8H_1_8} \\\\n_{O_2}=343.75molO_2[/tex]

Best regards!

Sandy is conducting an investigation to find out which

food his dog likes best. Which is the dependent variable

in his investigation?

color of the

dog's dish

BROWN

amount of

food eaten

the type of

food given

PINK

LIGHT GREEN

**Answer: Whats the question?**

Amount of food eaten.

A solution has a

pH of 2.5.

Answer the following questions.

pOH =

[H]=

[OH]=

**Answer:**

**pOH = 11.5**

**[H⁺] = 0.003 M**

**[OH⁻] = 3 × 10⁻¹² M**

**Explanation:**

The computation is shown below:

Given that

pH = 2.5

Based on the above information

We know that

**pH + pOH = 14 ⇒ pOH = 14 - pH
**

pOH = 14 - 2.5

**pOH = 11.5
**

**
[H⁺] = 10^(-pH) = 10^(-2.5)
**

**[H⁺] = 0.003 M
**

**[OH⁻] = 10^(-pOH) **

= 10^(-11.5)

= 3 × 10⁻¹² M

**[OH⁻] = 3 × 10⁻¹² M
**

Hence, the above represents the answer

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