Why do we fill balloons
with helium gas instead
of oxygen gas?

Answers

Answer 1

Answer:

Helium is less dense. Because helium is lighter than air, a helium balloon rises, just as an air bubble rises in more dense water

Explanation:

Also why not. It just is.

Answer 2

Answer:

This is due to the fact that helium has a lower density. A helium balloon rises like an air bubble in more dense water because helium is lighter than air. Another gas lighter than air is hydrogen, which is even lighter than helium.

Explanation:


Related Questions

In the image above, the region labeled “ A “ is called the . . .
White matter
Dorsal Horn
Central Canal
Ventral Root

Answers

Answer:

Ans B)=====> Dorsal Horn

Two arms, each known as a Dorsal Horn, are formed by the core grey matter at the back of the spinal cord. In the image, the region labeled “ A “ is called the Dorsal Horn. Therefore, option B is correct.

What is dorsal horn ?

One of the gray longitudinal columns discovered inside the spinal cord is the dorsal horn. Through the dorsal roots of the spinal nerves, it predominantly serves as the end of primary afferent fibers.

A complex network of excitatory and inhibitory interneurons, as well as projection neurons, make up the dorsal horn, which serves as an intermediary processing center for this information. It transmits the processed somatosensory information from the spinal cord to the brain.

The cell bodies of sensory neurons are located in the dorsal horns. The ventral horns are two arms of central grey matter that are found at the front of the spinal cord.

Thus, option B is correct.

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What does percent composition tell you about a molecule?
O A. It tells you the ratio of elements in the molecular formula.
OB. It gives you the total number of atoms in the molecule.
C. It tells you how much of a molecule is made up of each element.
O D. It tells you how the elements are arranged in the molecule.

Answers

Answer:

C

Explanation:

1. Calculate the grams of solute contained in 450. mL of a 0.075 M solution of CuCl2.

Answers

Answer:

4.6 grams CuCl2

Explanation:

Since molarity is a representation of moles per liter, we first want to convert 450. mL to liters:

450. mL * 1 L/1000 mL = 0.450 L

Now, we can use this number and the molarity to figure out the answer:

0.075 M means that for every liter, there is 0.075 moles of CuCl2.  Thus, we can multiply the amount of moles per liter by the number of liters of solution.

0.075 moles/1 L * 0.450 L = 0.03375 moles

Then, we need to round this to the appropriate number of significant figures, which gives us:  

0.034 moles CuCl2

Next, we can find the grams of CuCl2.  To do this, we first need to find the molar mass of CuCl2.  The molar mass of Cu is 63.546 g/mol and the molar mass of Cl is 35.453 g/mol, so the molar mass of CuCl2 is as follows:

(1 Cu * 63.546) + (2 Cl * 35.453) = 134.45 g/mol CuCl2

Now, we can multiply the grams per mole by the number of moles of CuCl2 in our solution:

134.45 g/mol * 0.034 moles = 4.5713 grams = 4.6 grams CuCl2, rounded to the appropriate significant figures.

2. Which is true regarding water? A. Compound of element B. Element of gases C. Mixture of gases D. Substances of gases​

Answers

D or A im not fully sure about my answer on that

PLEASE HELP ASAP 30 POINTS!!!!




Voltage ______
Question 1 options:


causes current


pushes free electrons around a circuit


is measured in Volts


all of the choices

Answers

The answer is: D - all of the above.

Explanation:

When a voltage source is connected to a circuit, the voltage will cause a uniform flow of charge carriers through that circuit called a current.

Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light.

In brief, voltage = pressure, and it is measured in volts (V).

pls help asap....................

Answers

Hope this helps!!!!:)

What are 4 enzymes responsible for digestion along with their substrate and end product​

Answers

Answer:

4 enzymes responsible for digestion:

1. Salivary amylase ---- substrate: Starch ---- end-product: Maltose  

2. Lipase  ---- substrate: Lipids (fats and oils) ---- end-product: Fatty acids and glycerol

3. Maltase ---- substrate: Maltose ---- end-product: Glucose

4. Protease ---- substrate: Protein ---- end-product: Amino acids

Question 1 (4 points)
Using the 4 pictures below, write a lab safety rule that could go with EACH of the pictures. You should have 4 rules in total (one for each picture)

Answers

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪  {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]

Blank # 1 - keep safe distance from the burner

Blank # 2 - Place the equipments on the right place after use

Blank # 3 - perform experiments with proper lab equipment and safety tools

Blank # 4 - Don't break any test tube or lab equipment

(maybe it can be hazardous)

Which of the following statements about absolute zero is correct?

Answers

it is a 0 degrees on the Kelvin scale

it is also the lowest on the thermometer

also the particles stop moving and all disorder disappears.

Acid-Base Reactions: HA + BOH → BA + H2O
Sulfuric Acid, H2SO4 (aq) + potassium hydroxide (aq) potassium sulfate (aq) + water (l)


Double Replacement Reactions: AB + CD → _ AD + CB
calcium chloride (aq) + ammonium hydroxide (aq) → calcium hydroxide (s) + ammonium chloride
(aq)


can someone do these two please!

Answers

H2so4+2koh gives K2so4(aq)+2H20
2H3o+ +SO4+2k+2OH gives 2k+SO4+4H20
2H3O+2OH gives 4H20
H30+OH gives 2H20

which example is an electron carrier in its reduced form?

Answers

Bad , fad is the answer check

6. A 10.0 g sample of krypton has a temperature
of 25 °C at 575 mmHg. What is the volume, in
milliliters, of the krypton gas?

Answers

Considering the definition of ideal gas law, the volume of the Krypton gas is 3840 mL.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P×V = n×R×T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.

Now, taking into account this law, and isolating the pressure variable (P), you get:

[tex]V=\frac{nxRxT}{P}[/tex]

In this case, you know:

n= [tex]10 gramsx\frac{1 mole}{83.80 grams} =[/tex]0.119 moles, where 83.80[tex]\frac{grams}{mole}[/tex] is the molar mass of Krypton, that is, the amount of mass that a substance contains in one mole.R= 0.082 [tex]\frac{atmL}{moleK}[/tex]T= 25 C=298 kP= 575 mmHg=0.756579 atm (being 1 atm=760 mmHg)

Replacing in the ideal gas law:

[tex]V=\frac{0.119 molesx0.082 \frac{atmL}{moleK}x298K}{0.756579 atm}[/tex]

Solving:

V=3.84 L= 3840 mL (being 1 L=1000 mL)

Finally, the volume of the Krypton gas is 3840 mL.

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At what point on a heating curve graph does a phase change occur?

at each plateau

at the first plateau

at each slope

at the last slope

Answers

Answer:

Electrical Bonding Investigation Data Quick Check

Explanation:

B. Heat energy is added to the substance, weakening the electrica attraction between molecules.

C. Both the melting point and boiling point are lower

C. The lone pairs of electrons in the oxygen atom causes the molecule to be bent; the oxygen atom has a particle negative charge, while the hydrogen atom have particle positive charges

D. Phase change

C. At each plateau

Cansjhdhsbdhajajajhsbsbshs hahahah she jansbsbsns haha be safe

Answers

Answer:

wait what?

Explanation:

brainliest pls

who invented aeroplanes please tellme​

Answers

Answer:

The Brazilian Santos Dumont

Explanation:

Santos Dumont created the 14 Bis airplane, the first airplane to perform a flight through 200 meters im Paris, France, in 23 October 1906

Orville and Wilbur Wright were the first two to actually invent the aeroplane. These American brothers also designed and flew their first creation after making it in their bicycle shop in December 17, 1903.

I hope this helps! :)

Please help , this is due today!!

Answers

Answer:

1. weak acid

2. weak base

3. weak acid

4. neutral

5. acidic

6. weak base

Explanation:

You can use a pH level scale like the one I attached, to determine each solution.

a) C8H18
Name the organic compound

Answers

Answer:

Explanation:

Octane

Octane is a straight chain alkane composed of 8 carbon atoms.

Kinetic energy is described as

Question 1 options:

Movement


Decreasing energy


Stored energy


Elastic

Answers

I’m pretty sure it’s movement, but I’m not 100%

Answer:

its the movement because kinetic energy means moving not stopping or decreasing

Explanation:

Which statement best describes the difference between a substance with a pH of 2.0 versus a substance with a pH of 4.0?
a
(1 point)
O The substance with a pH of 2.0 would have 100 times as many hydrogen ions per volume of water.
o The substance with a pH of 4.0 would have 100 times as many hydrogen ions per volume of water.
O The substance with a pH of 4.0 would have twice as many hydrogen ions per volume of water.
O The substance with a pH of 2.0 would have twice as many hydrogen ions per volume of water.

Answers

Answer:

The answer is the first one.

Explanation:

The lower a pH level the higher the the number hydrogen ions present in the acid's container.

ph = - log(H)

4 = - log(H)

- 4 = log(h)

10^-4 = H+

1 * 10^-4 = H +

ph = - log(H)

ph = 2

- 2 = log(H)

10^-2 = H

1*10^-2 = h

Something the power - 2 is 100 times greater than something with the power of -4

Answer:

the guy above is correct

Explanation:

how long does it take for food poisoning to show up?

Answers

Answer:

with in one to two days of

why can't plants photosynthesise in winter and drought​

Answers

Answer:

Because there is no water and they restore their food.

Explanation:

Like their glucose and that's why they also the leaf changes color

what did immortality-seeking alchemists create by mixing sulfur, charcoal, and potassium nitrate?

Answers

Answer:

Gunpowder was discovered somewhat inadvertently by Chinese alchemists, who were trying to develop an elixir of immortality. If you're not aware, there are three primary components to gunpowder: saltpeter (potassium nitrate), sulfur, and charcoal. ... The use of sulfur by the Chinese is also ancient.

Explanation:

Does this reaction meet the Law of Conservation of Mass? 2H2 + O2 → 2H2O explain.

Answers

Answer:

yes because on the left side 4 hydrogen in right side 4 hydrogen on the left side 2 oxygen in the right side 2 oxygen

Answer:

The Law of Conservation of Mass states that the mass of the system must remain constant over time as the system's mass cannot change because energy is not created nor destroyed. To tell if a chemical equation meets this law, check to see if the number of atoms is the same on both sides of the chemical equation.

Reactant Side:

4 atoms of Hydrogen2 atoms of Oxygen

Product Side:

4 atom of Hydrogen2 atoms of oxygen.

Remember, when counting the atoms in a equation the subscript is the number that represents the quantity of that specific atom. Subscripts are numbers that come after a symbol and below. If an element does not have a subscript, then it is understood that the subscript is 1.  The coefficent represents the quantity of molecules, the coefficient multiplies everything in the formula.

Which of the following terms is a chemical substance made of a single type of atom that cannot be broken down into a simpler substance?

A- nucleus
B- molecule
C- Compound
D- Element ​

Answers

Answer is D

Explanation:

Elements are made of a single type of atom and cannot be broken down any smaller.

are diamonds and graphite made from the same element

Answers

Answer:

Graphite and diamond are two of the most interesting minerals. They are identical chemically – both are composed of carbon (C), but physically, they are very different. Minerals that have the same chemistry but different crystal structures are called polymorphs.

MULTIPLE CHOICE
What is the molality (m) of 3.5 mol of sugar in 2.5 kg of water?

Answers

The molality of the solution is 1.4 moles per kilogram (molal).

The molality of the solution is equal to the number of moles of sugar (solute) divided by the number of kilograms of water (solvent). Hence, the molality is determined below:

[tex]m = \frac{3.5\,mol}{2.5\,kg}[/tex]

[tex]m = 1.4\,\frac{mol}{kg}[/tex]

The molality of the solution is 1.4 moles per kilogram (molal).

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Please help I’ll give brainlist who ever answers I just want the answer so please help!!

Answers

Answer:

{B}

Explanation:

The answer is b. Some of the components are very large,

Q: Arrange the element according to the increase radius or size
1. Na, K, Cs Fr, Rb
2.  Ca, Sr, Ba, Ra, Mg

Answers

Answer:

Refer to the periodic table to do this.

Explanation:

1. Na, K, Cs Fr, Rb

  Sodium, Potassium, Cesium, Francium, Rubidium

  3, 4, 6, 7, 5

Ascending order: Na, K, Rb, Cs, Fr

2. Ca, Sr, Ba, Ra, Mg

   Calcium, Strontium, Barium, Radium, Magnesium

   4, 5, 6, 7, 3

Ascending Order: Mg, Ca, Sr, Ba, Ra

When doing the electronic configuration of the elements, count how many number of divides it has. For example, Na(Sodium) has 11 electrons and it is divided like this: 2,8,1. So it divides into 3 parts so there will 3 shells for sodium.

Hopefully this helps!!

Short definition of inclined plane

Answers

what is an inclined plane?

an inclined plane is a surface that is at an angle against a horizontal surface. one of the simple machines; a slopping surface such as ramp, such that an object can be raised with less effort than being lifted vertically.

hope it helps:) and mark me as brainliest please:)

Answer:

inclined plane, a simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction

Explanation:

The steeper the slope, or incline, the more nearly the required force approaches the actual weight. The steeper the slope, or incline, the more nearly the required force approaches the actual weight.

I need the circle question to be answered please help me this.

Answers

Answer:

(iii):

Reaction 1: Addition

[ We added chlorine to 2-propene ]

Reaction 2: Substitution

[ We substituted hydroxyl ion with chloride ion ]

Reaction 3: Oxidation

[ Acidified permanganate solution is a strong oxidizing agent. So we oxidized propanol to propanoic acid ]

Reaction 4: Acid - base

[ A base (Sodium hydroxide) is added to an acid (propanoic acid) to form a neutral salt ( Sodium propanoate ) ]

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