Fill in the blanks to describe the work of Ben Kennedy, a volcanologist who works in New Zealand. To learn more about why his pumice sample was shrinking, Ben Kennedy studied . This material is similar to pumice because both are full of air . Kennedy found that the shrinking had to do with molten rock’s surface , which is the force that holds a droplet of water together.

The acceleration of the plane : -2 m/s²(negative=deceleration)

Given

vo=245 m/s

vt=230 m/s

t = 7 s

Required

The acceleration

Solution

Motion with constant acceleration

[tex]\tt v_t=v_o+at[/tex]

Input the value

[tex]\tt 230=245+a.7\\\\-15=7a\Rightarrow a=-2.14\approx rounded~-2~m/s^2[/tex]

Answer:

Explanation:

Edge 2020

The mass of iron (III) oxide (Fe2O3) : 85.12 g

Given

3.20x10²³ formula units

Required

The mass

Solution

1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol of Fe₂O₃ :

[tex]\tt n=\dfrac{3.2.10^{23}}{6.02.10^{23}}=0.532[/tex]

mass of Fe₂O₃ (MW=160 g/mol)

[tex]\tt mass=mol\times MW=0.532\times 160=85.12~g[/tex]

We have 84.84g of  Fe[tex]_2[/tex]O[tex]_3[/tex] in 3.20*10^23 particles.

Data;

To solve this problem, we need to relate Avogadro number to the molar mass.

From molar mass - Avogadro's number relationship;

[tex]159.69g = 6.023*10^2^3\\xg = 3.20*10^2^3\\x = \frac{159.69*3.20*10^2^3}{6.023*10^2^3} \\x = 84.84g[/tex]

From the above calculations, 84.84g of Fe[tex]_2[/tex]O[tex]_3[/tex] is present in 3.20*10^23 particles of  Fe[tex]_2[/tex]O[tex]_3[/tex].

Learn more on Avogadro's number here;

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Answer:

Elephant Toothpaste

Extra

Make Elephant Toothpaste

Pour 1/2 cup hydrogen peroxide solution, 1/4 cup dishwashing soap, and a few drops of food coloring into the bottle. Swish the bottle around to mix the ingredients. Set the bottle in a sink or outdoors or some other place where you won't mind getting wet foam everywhere.

In a separate container, mix a packet of active yeast with a little warm water. Give the yeast about five minutes to activate before proceeding to the next step.

When you are ready to do the demo, pour the yeast mixture into the bottle. The reaction occurs immediately upon the addition of the yeast.

I don't know if this will help but here you go.

The annswer are  -
1. the center of  an atom is a nucleus

2. protons and neutrons

3. electrons circle the nucleus and have a negative charge

4. the number of electrons

5. the number of protons

7. a molecule that is formed from two or more different types of atoms.

1. The nucleus is at the center of every atom and contains protons and neutrons, while electrons orbit around the nucleus.

2. Protons and neutrons make up the nucleus of an atom, providing mass and stability.

3. Electrons circle the nucleus in specific energy levels and have a negative charge, playing a role in chemical bonding and interactions.

4. The number of protons in an atom is equal to its atomic number and determines the element it belongs to.

5. The number of protons in an atom specifically determines the type of element it represents.

7. A compound is a molecule formed from different types of atoms, combining chemically to create a new substance.

Learn more about atom at:

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Answer:

Explanation:

The kinetic energy of an object can be found by using the formula

[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]

m is the mass

v is the velocity

From the question we have

[tex]k = \frac{1}{2} \times 2 \times {15}^{2} \\ = 1 \times 225 \\ = 225 \: \: \: \: \: \: \: \: [/tex]

We have the final answer as

Hope this helps you

Answer:

225 J for both answers

Explanation: :)

Answer:

12 g

Explanation:

Chemical equation:

MgCO₃      →        MgO  +  CO₂

12g           =           5.28g + 6.72 g

12 g           =            12 g

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

MgCO₃      →        MgO  +  CO₂

There are 12 g of magnesium carbonate on the left side, according to the law of conservation of mass on the right side there should be 12 g product. Thus, 6.72 g of CO₂ should be formed.

Answer: It’s Nh !!!

Explanation:

Alkali metals and alkaline earth metals always produce cations, while halogens always produce anions. so, option A is correct.

A cation has a net positive charge because it contains more protons than electrons. One or more electrons must be lost in order for a cation to develop normally, these electrons are drawn away by atoms having a larger attraction for them.

Main-group elements often produce cations with a charge equal to the group number as they move from the extreme left to the right on the periodic table. To put it another way, group 1 elements produce 1+ ions, group 2 elements produce 2+ ions, and so on.

Cations, which have a positive charge, are created when electrons are lost. Anions, which have a negative charge, are created when electrons gain energy.

Thus, option A is correct.

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Answer:

Standard Notation:39,400,000

Explanation:

3.94*10^7= 39,400,000

the answer is 39400000x

Explanation:

Mass of C = 112g * (85.6/100) = 95.87g

Moles of C = 95.87g / (12g/mol) = 8

Mass of H = 112g * (14.4/100) = 16.13g

Moles of C = 16.13g / (1g/mol) = 16

Hence the compound is C8H16. (D)

Answer:

x=676

Explanation:

Answer:

x = 676

Explanation:

13*4 = 52

8*78 = 624

624 + 52 = 676

Answer:

A water repellent protein that divides into hard and soft types

Answer:

In a turbine generator, a moving fluid—water, steam, combustion gases, or air—pushes a series of blades mounted on a rotor shaft. The force of the fluid on the blades spins/rotates the rotor shaft of a generator. The generator, in turn, converts the mechanical (kinetic) energy of the rotor to electrical energy.

Explanation:

Hope this helps!

Brain-List?

Answer:

no , it's clear like a mirror

there's is nothing blurred

Answer:

The names of the reactant and products are:

1. The name of the reactant is calcium trioxocarbonate (iv) (CaCO₃)

2. The names of the products are:

a. Calcium oxide (CaO)

b. Carbon (iv) oxide (CO₂)

In a chemical equation, the reactants are located on the left hand side (LHS) while the products are located on the right hand side (RHS)

With the above information, we can determine which is the reactant and which is the product in the question given above. This can be obtained as follow:

CaCO₃ —> CaO + CO₂

The name of CaCO₃ is calcium trioxocarbonate (iv).

The name of CaO is calcium oxide.

The name of CO₂ is carbon (iv) oxide

Learn more: https://brainly.com/question/11764613

Answer:

See explanation

Explanation:

A Lewis or dot structure shows the electrons on the valence shells of the bonding atoms as dots.

The method was developed by Sir G.N Lewis.

Oxygen is a diatomic molecule as shown in the image attached to this answer. There are two unshared electrons on each oxygen atom as well as four shared electrons

The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.

Oxygen has been a group 6A element consisting of 6 valence electrons. In order to attain the stable configuration, the atom of oxygen has been required to gain two electrons.

The oxygen shares its electrons with another oxygen atom and forms a covalent bond. The resulted bond has been able to stabilize the structure.

The image attached shows the lewis dot structure of the oxygen atom. The sharing of electrons between the two oxygen atoms results in the completion of the octet and thereby stabilizing the atoms.

For more information about the lewis dot structure, refer to the link:

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Answer:

The answer is actually CO4

Explanation:

prove me wrong

Answer:

C2O4

Explanation:

Di means 2 and tetra means 4

Mol He in the mixture = 2

Given

50% by mass

2.2 moles of mixture

Required

The mole number of He

Solution

50% by mass⇒ mass of He : mass of Ar = 1 : 1

Mol He = 2.2 - mol Ar

mass He = mass Ar

mol x MW He = mol x MW Ar

(2.2-mol Ar) x 4 = mol Ar x 40

8.8 - 4 mol Ar = 40 mol Ar

8.8 = 44 mol Ar

mol Ar= 0.2

mol He = 2.2 - 0.2 = 2

Answer:

Each isotope of oxygen contains 8 protons, but differs in the number of neutrons. An isotope number is a shorthand representation of its mass. Because protons and neutrons are roughly equal in mass, an isotope's number is equal to the sum of its protons and neutrons.

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

The percent yield : 95%

Given

Reaction

2H₂+O₂ ⇒2H₂O

Required

The percent yield

Solution

mol of Hydrogen(as a limiting reactant) :

[tex]\tt \dfrac{100}{2}=50[/tex]

mol H₂O based on H₂ , and from equation mol ratio H₂:H₂O=2 : 2, so mol H₂O = 50

Mass of water(theoretical yield) :

[tex]\tt mass=50\times 18=900~g[/tex]

[tex]\tt \%yield=\dfrac{860}{900}\times 100\%=95\%[/tex]

Answer and Explanation:

Elisa is feeling tired because she has diabetes - suported: diabetes, in fact, can trigger episodes of extreme tiredness in patients, this tiredness may have been accompanied by dizziness and being.

Elisa is feeling tired because she has anemia. - Supported: Anemia hampers the transmission of oxygen in the blood, which can cause tiredness, weakness and extreme fatigue.

Elisa is feeling tired because she has an injury to her pancreas - suported: The pancreas is responsible for the production of insulin which is essential to prevent diabetes from establishing itself in the body. If the pancreas is damaged, insulin may be insufficiently produced, increasing the chance of developing diabetes and causing tiredness.

Elisa is feeling tired because she has asthma - suported: asthma causes breathing difficulties, this can cause tiredness and fatigue.

Answer:

I think its C

Explanation:

because it travels from the sun to earth

Answer is 1.41 x 10 with the exponent of 24, atoms

Explanation : Look at the picture i attached.

Answer:

Conduction

Convention

Radiation

in that order

Answer:

Conduction

Convention

Radiation

Explanation:

Answer:

ok so im gonna go and do some for your latest questions then if thats alright with you

Explanation:

i need points so im trying to help as many people as i can before the end of the day.

but you have to make the questions forst so i can help you understand them

Answer:

propyl

Explanation:

CH3-CH(CH3)-CH2 is a propyl group, the halogen is bromine thus the common name is propyl bromide

Answer:

i think it might be c

Explanation:

i'm not positive though

Answer:

C

Explanation:

Sedimentary rocks can contain fossils because, unlike most igneous and metamorphic rocks, they form at temperatures and pressures that do not destroy fossil remains.

Answer: An ionic solution is when the ions of a compound have dissociated in an aqueous solution. A reaction happens when you mix two aqueous solutions. This is when you find out if a precipitate will form or not. A precipitate forms if the product of the reaction of the ions is insoluble in water.

Explanation: I think ;>;