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Answers

Answer 1

Answer:

Explanation:

1.  H2O

Lewis Dot:  

See the attachment.

Note the б+ and б- signs on the H and O atoms, respectively.  Those represent the slightly positive and slightly negative sides of the water molecule.  Those slight charges on a single water molecule are attracted to their opposite charges on neighboring H2O molecules, as shown in the graphic.  This interaction is what gives water it's cohesive properties.

3.  The property of cohesion describes the ability of water molecules to be attracted to other water molecules. which allows water to be a "sticky" liquid.

The hydrogen bonds are attractions of electrostatic force.  They arise due to the difference in charge between the slightly positive hydrogen ion and the slightly negative oxygen ion. Hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond, and it is what gives water it's cohesiveness, or ability to support water spiders, paper clips, and produces a loud noise in the event of a belly flop in a pool (including the yelp from the swimmer).

4.  I'm not sure what is being asked for the two blanks.  Water is polar and dissolves salts (ionic compounds) and hydrophilic molecules (water-loving molecules).

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Related Questions

What mass of helium gas (in g) occupies 15.3 L at STP?

Answers

Answer:

[tex]\boxed {\boxed {\sf 2.73 \ g \ He}}[/tex]

Explanation:

We are asked to find the mass of helium gas given a volume.

1. Convert Liters to Moles

1 mole of any gas occupies a volume of 22.4 liters. So, 1 mole of helium gas contains 22.4 liters of helium. Create a ratio using this information.

[tex]\frac {1 \ mol \ He }{ 22.4 \ L \ He}[/tex]

We are converting 15.3 liters of gas to moles, so we multiply by that value.

[tex]15.3 \ L \ He *\frac {1 \ mol \ He }{ 22.4 \ L \ He}[/tex]

The units of liters of helium (L He) cancel.

[tex]15.3 *\frac {1 \ mol \ He }{ 22.4}[/tex]

[tex]\frac {15.3}{22.4} \ mol \ He[/tex]

[tex]0.6830357143 \ mol \ He[/tex]

2. Convert Moles to Grams

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table as atomic masses, but the units are grams per moles. Look up the molar mass of helium.

He: 4.0026 g/mol

Create another ratio using the molar mass.

[tex]\frac {4.0026 \ g \ He}{1 \ mol \ He}[/tex]

Multiply by the number of moles we calculated.

[tex]0.6830357143 \ mol \ He *\frac {4.0026 \ g \ He}{1 \ mol \ He}[/tex]

The units of moles of helium (mol He) cancel.

[tex]0.6830357143*\frac {4.0026 \ g \ He}{1 }[/tex]

[tex]2.73391875 \ g \ He[/tex]

3. Round

The original measurement of volume has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the hundredths place.

The 3 in the thousandths place to the right (2.73391875) tells us to leave the 3 in the hundredths place (2.73391875).

[tex]2.73 \ g \ He[/tex]

15.3 liters of helium gas is approximately 2.73 grams of helium.

CaCO3 + 2HCl > CaCl2 + CO₂ + H₂O​

Answers

Explanation:

This reaction is also known as double decomposition reaction.

HCl + CaCO3 + MgCO3 → H2O + H2 + CO2 + CaCl2 + MgCl2

The number of joules required to heat one gram of a substance one degree Celsius is _____.


endothermic

temperature

exothermic

specific heat capacity

Answers

The answer is D - specific heat capacity.

The process during which cells of the body harness energy from food consumed by a living organism is ______________________.

Answers

It is called Cellular Respiration

What is the molarity of a sodium chloride solution that has 2.0 mol of
sodium chloride dissolved in 0.25 L of water? Answer to two
significant figures.

Answers

Answer:

[tex]\boxed {\boxed {\sf 8.0 \ M \ NaCl}}[/tex]

Explanation:

Molarity is a measure of concentration in moles per liter, therefore the formula is:

[tex]molarity= \frac{moles \ of \ solute}{lites \ of \ solution}[/tex]

There are 2.0 moles of solute or sodium chloride dissolved in 0.25 liters of water or solution.

moles of solute = 2.0 mol NaCl liters of solution = 0.25 L

Substitute these values into the formula.

[tex]molarity= \frac{ 2.0 \ mol \ NaCl}{0.25 \ L}[/tex]

Divide.

[tex]molarity=8 \ mol \ NaCl / L[/tex]

Molarity is measured in molars or M. 1 molar is equal to 1 mole per liter, so our answer is equal to 8 molars.

[tex]molarity= 8 \ M \ NaCl[/tex]

The original measurements of moles and liters have 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. There are no numbers to round, so we add a 0 in the tenths place.

[tex]molarity= 8.0 \ M \ NaCl[/tex]

The molarity of the solution is 8.0 M NaCl.

10. As electrons move through the electron-transport chain,
they lose energy, which is used to form
O A. NAD.
O B. ADP
O C. ATP.
O D. GBP

Answers

Answer:

C. ATP.

Explanation:

During the process of aerobic cellular respiration, energy is said to be released in three main stages: glycolysis, Krebs cycle and oxidative phosphorylation (electron transport chain). The electron transport chain produces the most energy and it involves the transfer of electrons through series of complex proteins.

As the electrons move through the individual complexes, energy is lost to form a proton gradient (H+). The proton gradient powers the synthesis of ATP from ADP as catalyzed by ATP synthase.

tính chất hoá học của Cu

Answers

Answer:

các oxit đồng khi nó tiếp xúc với không khí. nó phản ứng đặc biệt với oxy trong không khí (không phải hơi ẩm), và tạo ra nấm mốc

list four quantum no. that defines energy state of the electron in hydrogen along with their possible values and explain their significance in terms of orbitals?

Answers

principal quantum number
magnetic quantum number
subsidiary quantum number
spin quantum number

How much does the mass of 12.65-g sample of copper(II) nitrate hexahydrate decrease when heated?

Answers

There is 103 percent of water in hydrate

process which take place when litimus paper turns white when dropped into a chlorine water ​

Answers

Answer:

It is called bleaching oxidation process.

You mix the sample discussed in the previous two questions with another sample, which you know to be pure acetylsalicylic acid. You grind the mixture thoroughly with a mortar and pestle, and do a melting point determination on the mixed product. You now observe melting over a range of 127 to 133 C. Now what conclusions can you reach regarding the original product

Answers

Answer:

Having high melting point.

Explanation:

The original product has high melting point as compared to the mixture product because in the original product, the element is present in its pure state and we know that pure substances have high melting point as compared to mixture substances due to the presence of strong intercellular forces between them which is hard to break so that's why we can say that the original product has high melting point.

A car of 1200 kg is moving with a speed of 36 Km/hr. It is stopped by applying brakes withion with in 5 seconds. Calculate the amount of force required to stop the car.

Answers

Answer:

–2400 N

Explanation:

This is a physics question. However, the answer to the question is given below.

We'll begin by converting 36 Km/hr to m/s. This can be obtained as follow:

3.6 Km/hr = 1 m/s

Therefore,

36 Km/hr = 36 Km/hr × 1 m/s / 3.6 km/hr

36 Km/hr = 10 m/s

Thus, 36 Km/hr is equivalent 10 m/s.

Next, we shall determine the acceleration of the car. This can be obtained as follow:

Initial velocity (u) = 10 m/s

Final velocity (v) = 0 m/s

Time (t) = 5 s

Acceleration (a) =?

a = (v – u) / t

a = (0 – 10) / 5

a = – 10 / 5

a = –2 m/s²

Finally, we shall determine the force required to stop the car. This can be obtained as follow:

Mass (m) = 1200 Kg

Acceleration (a) = –2 m/s²

Force (F) =?

F = ma

F = 1200 × –2

F = –2400 N

NOTE: The negative sign indicate that the force is in opposite direction to the motion of the car.

the solubility of sugar is 250 at 60° what does it mean​.
please helpp anyone please help...

Answers

Answer:

sry i don't know answer of This question


I’m screwed omg i totally forgot I have school today and forgot to do this someone help me rq I’ll brainlist plslsls be awake just make sure you write the word equation for each of the following metal oxidation reactions or if you can, also write a chemical equation below it. idrm bout that but it’ll be really nice if u did.


tried doing it and if ur one of the smart people that can do science unlike me surely u’ll help. ☺️

Answers

Answer:

Zn + O2 = ZnO

Mg + O2 = MgO

Cu + O2 = CuO

Al + O2 = Al2O3

Explanation:

My theoretical yield is 14 grams of water. I actually produced 6 grams of water. What is my percent yield?

Answers

Answer:

Pertaining to the interrogate, the answer to such is acknowledged and henceforth disseminated as 43.0%

Explanation:

To evaluate such, the following must be comprehended:

Percent Yield Calculator:

% Yield = (What You Actually Got / What You Should Theoretically Get) * 100

The following variables may be denoted, as stated within the interrogate:

Yielded/Produced: 6 grams.

Theoretical Yield: 14 grams.

(6 g/14 g) * 100 = 42.8571428571

*Grams measurement cancels*

42.8 ==> 43.0%

Thus, if rounded to the nearest tenth, the percent yield is equivalent to 43.0%.

how would you detect sulphur in organic compounds​

Answers

Answer:

sodium fusion is changed to sodium sulphide if sulphur is present in the compound

Which statement is true about percent yield

Answers

The options ? We can’t answer your questions without any options or choices

Câu 36: _VD _Hình lập phương có thể tích là 1253 thì diện tích đáy là:

A. cm2 B. 5cm2 C. 25cm2 D. 52cm2

Answers

Answer:

c

Explanation:

Cạnh của hình lập phương là

³\(125 = 5cm

Diện tích đáy của hình lập phương là

5²=25cm²

Đáp án C

Que. 1. Gallium has 2 naturally occuring Isotopes with mass numbers 69 & 71 respectively. What is the percentage abundance of both Isotopes if their relative atomic mass is equal to 70.59 Amu (Atomic mass Unit)​

Answers

Isotopes are atoms of the same element that have different masses. The relative atomic mass (am) is a weighted average that takes into account the abundance of each isotope. We can calculate the relative atomic mass using the following expression.

[tex]am = \frac{\Sigma m_i \times ab_i}{100}[/tex]

where,

mi: mass of each isotopeabi: percent abundance of each isotope

For Gallium,

[tex]70.59 amu = \frac{69 amu\ x + 71 amu\ y}{100}[/tex]     [1]

where "x" and "y" are the unknown abundances.

We also know that the sum of both abundances must be 100%.

x + y = 100

y = 100 - x   [2]

If we replace [2] in [1], we get

[tex]70.59 amu = \frac{69 amu\ x + 71 amu\ (100-x)}{100} \\7059 amu = -2 amu\ x + 7100amu \\x = 20.5[/tex]

Then, in [2]

y = 100 - x = 100 - 20.5 = 79.5

In conclusion, Ga-69 has an abundance of 20.5% and Ga-71 has an abundance of 79.5%.

You can learn more about isotopes in: https://brainly.com/question/21536220?referrer=searchResults

I need help on this question asap!
You are in a lab and you use 11.50 g of Na(s) to react with Cl(g). Below is the reaction that happens from this.

Na + Cl2 → NaCl

Your percent yield is 95%. From this info what is the actual yield?

Answers

Answer:

27.79 g to the nearest hundredth.

Explanation:

2Na + Cl2 ---> 2NaCl

Using the molar masses , the theoretical yield is:

46 g of Na yields  46 + 35.5*2 g NaCl

46 g ---> 117 g NaCl  so

11.5 g ----> 117 * 11.5 / 46 g NaCl

But, as the yield is 90%

the actual yield is 0.95 * 117 * 11.5 / 46

= 27.79 g.

which orbital has the lowest energy

Answers

Answer:

s orbital

Explanation:

it has the lowest energy because

Paulis law state that orbitals with lower energy must be fill first before that of higher energy

and the s orbital is filled first

The atomic mass of calcium is calculated by adding the mass (amount) of

A) Protons and Electrons
B) Protons and Neutons
C) Electrons and Neutons
D) Protons and Protons​

Answers

Answer:

B. Protons and Neutrons

Answer:

Option"B" is correct.

MARK ME BRAINLISTS

PLZ HELP Matthew wants to study how the body responds when the skin is broken. He learns that particles in the blood clump together at the site of the wound to stop the bleeding while the skin heals. Which of the following body systems is involved in carrying the blood to the site of the wound?
A. Cardiovascular
B. Skeletal
C. Respiratory
D. Muscular​

Answers

Answer:

A, Cardiovascular system

cardiovascular system

A block of dry ice (-40°C) is placed in contact with an ice cube (-10°C).
What will happen, assuming no chemical reactions occur?
O Heat will flow from the ice cube to the dry ice.
O Heat will flow from the dry ice to the ice cube.
O There is no way to tell without a thermometer
O No heat will flow.​

Answers

Explanation:

Answer is that : no heat will flow

Answer:

Heat will flow from the ice cube to the dry ice

Explanation:

Although tom was a poor student, he studied very well

Answers

Tom. The ‘T’ should be in capital. Every sentence should end with a full stop ‘.’ . This also has nothing to do with Chemistry. So yeah. Mark me brainliest please.

can u plz solve n send me
I will give u branist, rate u 5 star,give u a like and I will also follow u​

Answers

Answer:

5.ethanol and carbon dioxide

6.it contains ethyl alcohol which can be effective at killing viruses and bacteria

A solution, such as pure water, with a pH of 7 contains which of the following?

a. Dissolved CO2

b. Equal amounts of hydrogen ions and hydroxide ions

c. Smokestack pollutants such as sulfur dioxide

d. Sodium hydroxide

Answers

Answer:

B

Explanation:

Pure water always has equal concentrations of hydrogen and hydroxide ions.

9.

Look at the following equation. What is the oxidizing agent? 3Mg + N2 ->Mg3N2

Answers

Answer:

In this reaction, nitrogen acts as the oxidizing agent. Mg is a reducing agent.

Why are the highest oxidation state of the transition metal stabilised in the oxide and fluoride compond?

Answers

Answer:

Following are the solution to the given question:

Explanation:

Its maximum oxidation zone is exceptionally stable and has the greatest ability to charge density, while fluoride and oxide ions are the largest particles with the largest durability of charge.

Or it might be assumed as oxygen and fluorine are the system particle atoms that have the highest electron number of metals.

Im sorry if its difficult to read


we dont talk about how I messed up my first question and jad to make another one because im slow​

Answers

Answer:

A ball is thrown straight up from a rooftop 320 feet high. The formula below describes the ball's height above the ground, h, in feet, t seconds after it was thrown. The ball misses the rooftop on its way down and eventually strikes the ground. How long will it take for the ball to hit the ground? Use this information to provide tick marks with appropriate numbers along the horizontal axis in the figure shown.

h=-16t^2+16t+320

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