help!!! i need these 3

Answer:

Their positive charge is located in the small nucleus

Explanation:

Ernest Rutherford performed the gold foil experiment in 1911 where he used alpha particles generated from a radioactive source to bombard a thin gold foil.

In his experiment, he observed that the bulk of the alpha particles passed through the gold foil, just a tiny fraction was deflected back. To explain his findings, Rutherford proposed that an atom is made of positively charged centre where nearly all the mass is concentrated called nucleus. Surrounding the nucleus is a large space containing electrons.

He discovered that other than the nucleus at the center, atoms are mostly just empty space. So A makes the most sense.

Answer:

Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.

Answer:

ΔG = - 2.0 kJ/mol and the reaction is spontaneous.

Explanation:

∵ ΔG = ΔH - TΔS,

ΔH = - 44.0 kJ/mol, T = 350.0 K, ΔS = - 0.12 kJ/K.mol.

∴ ΔG = ΔH - TΔS = (- 44.0 kJ/mol) - (350.0 K)(- 0.12 kJ/K.mol) = - 2.0 kJ/mol.

The sign of ΔG assigns the spontaneity of the reaction:

∵ ΔG has a negative value, so the reaction is spontaneous.

ΔG = - 2.0 kJ/mol and the reaction is spontaneous.

The answer would be a. C2H4(ethylene)

1C2H4+3O2~>2CO2+2H2O

Answer:

a. C2H4.

Explanation:

Let's look at the balanced equation for C2H4.

C2H4  + 3O2 -->  2CO2 + 2H2O

So 1 mole of this hydrocarbon reacts with 3 moles of oxygen and since  1 mole of one gas occupies the same volume as another gas, the volumes  will be in the ratio 1:3.  So this is the required hydrocarbon.

Answer:

[tex]\boxed{\text{D. Resonance}}[/tex]

Explanation:

If an external vibration matches the drum's natural frequency, it will induce the can to vibrate. This is an example of resonance.

It is analogous to pumping your legs in synchronization with a swing's natural frequency.

Answer:

1.  C.  distillation

2.  B.  conversion of mechanical energy into nuclear energy

3.  B.  Alpha ray

Explanation:

Answer:

Element

Explanation:

since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.

Answer:

b

Explanation:

Answer:

There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate [tex]\rm Al_2(SO_4)_3[/tex].

Explanation:

What's the empirical formula of aluminum sulfate?

Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.

Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.

The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.

The least common multiple of 2 and 3 is 6. That is:

Pairing three [tex]\rm {SO_4}^{2-}[/tex] ions with two [tex]\rm Al^{3+}[/tex] will balance the charge. Hence the empirical formula: [tex]\rm Al_2(SO_4)_3[/tex].

What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]?

Refer to a modern periodic table for relative atomic mass data:

There are

in one formula unit of [tex]\rm Al_2(SO_4)_3[/tex].

Hence the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]:

[tex]\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}[/tex].

How many moles of formula units in 6.35 grams of [tex]\rm Al_2(SO_4)_3[/tex]?

[tex]\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol[/tex].

Answer:

What are the options?

Explanation:

I'll need to know the options in order to answer that.

Answer:

The object will float in water and citric acid.

Explanation:

The object will float, if it is less dense than the substance it is placed in.

The object will sink, if it is more dense than the substance it is placed in.

So, the object will float in water and citric acid.

Answer:

The right choice is "wind power requires a lot of space and depends on local weather patterns "

Explanation:

    2. geothermal power requires more land than other power plants  

    3. nuclear power produces small amounts of energy from large masses

So the right choice is "wind power requires a lot of space and depends on local weather patterns "

no significant change

Explanation:

When an atom emits a beta particle, a neutron is changed into a proton by emitting an electron. The electron has a negligible mass (very small), hence there is no significant change in atomic mass.

Answer: Volume and temperature

Explanation:

Answer:

volume and temperature

Explanation:

Answer: most contain the same basic components of pigments, oils, waxes, and preservatives.

Explanation: YOOOO was up :))))))

When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.

The sustainable practice can be described as one that can be seen in A. Wind farms . option A  is correct.

It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.

Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.

Hence ,  option A  is correct.

Learn more about sustainable practice at;

https://brainly.com/question/20203650

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Answer:

2:2

Explanation:

The question is on mole ration in a chemical equation.

Steps to identify mole ratio in an equation

2H₂ + O₂⇒ 2H₂O------------------This equation is balanced. how?

Number of hydrogen atoms in reacting side= 2×2=4

Number of hydrogen atoms in the products side= 2×2=4

Number of oxygen atoms in the reacting side=2

Number of oxygen atoms in the product side =2

Writing the mole ratio in the equation

2H₂ + O₂⇒ 2H₂O

2         1        2

Mole ratio of hydrogen to water

2H₂ + O₂⇒ 2H₂O

2                  2

=  2:2

Answer:

[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]

Explanation:

The pressure is constant, so we can use Charles' Law.

[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C  

V₂ = ?;                 T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]

The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].

Species will be four secondary and tertiary consumers will be 25

Explanation-

Given in the question the number of species is 4 then it will have 8 primary 10 secondary and 10 tertiary consumers.  If this number of primary consumers increases from 8 to 20 consumers then the number of species involved would be 10 { 4x20/8 }

Number of secondary consumers would also be increased and increased value would be 25 { 10x20/8 } then again comes the tertiary number of consumer which also increases. The number of tertiary consumers will increase to 25 { 10x20/8} same as secondary.  

Among the four ecosystems, ecosytem 3 is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be fewer producers in the ecosystem.

A. heat; light energies

Answer:

the answer is A; firstly heat then heat light.

Answer:

deez nuttts

Explanation:

Element 50

Symbol Sn

TIN

Answer:

16.82 L.

Explanation:

where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.

Answer:

Neon lights don't actually change colors.

Explanation:

Neon signs give the illusion of changing color by turning different components of the signs on or off.

Answer:

The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals are used to produce other colors, such as hydrogen (red), helium (yellow), carbon dioxide (white), and mercury (blue).

Explanation:

those are all the color signs i know this because i did it before

Answer:

2Na₂O₍s₎+ 2Cl₂₍g₎⇒4 NaCl₍s₎ +O₂₍g₎

Explanation:

The more reactive chlorine gas displaces the less reactive oxygen gas from the compound sodium oxide. The correct equation is C. because the number of each type atom on each side is equal hence the equation is balanced. There are 4 sodium atoms on the left side as there are on the right, 4 chlorine on both sides and two oxygen on both sides.

Answer : The correct equation will be,

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

Explanation :

The given reactions are:

(1) [tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]

(2) [tex]4Na(s)+O_2(g)\rightarrow 2Na_2O(s)[/tex]

Both the given chemical reactions are balanced chemical reaction. So, in order to get the final equation we first multiply equation 1 by 2 and reverse the equation 2 then add both the equations, we get the overall equation for the reaction the produces [tex]NaCl[/tex] and [tex]O_2[/tex] from [tex]Na_2O[/tex] and [tex]Cl_2[/tex]

(1) [tex]4Na(s)+2Cl_2(g)\rightarrow 4NaCl(s)[/tex]

(2) [tex]2Na_2O(s)\rightarrow 4Na(s)+O_2(g)[/tex]

The final reaction will be,

[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]

Answer:

[tex]\boxed{\text{864 kJ}}[/tex]

Explanation:

The formula for the heat transferred to or from an object is

q = mCΔT

Data:

m = 2.94 kg

C = 1.75 J·°C⁻¹g⁻¹

T₁ = 23 °C

T₂ = 191 °C

Calculations:

(a) Convert the mass to grams

m  = 2.94 kg = 2940 g

(b) Calculate ΔT

ΔT = T₂ - T₁ = 191 – 23 = 168 °C

(c) Calculate q

q = 2940 × 1.75 × 168 = 864 000 J = 864 kJ

You must provide[tex]\boxed{\textbf{864 kJ}}[/tex].

Answer:

acid rain is produced from harmful emissions in the air clinging to the water molecules and coming down as rain

Explanation:

The type of acid rain that contains water is called wet deposition. Acid rain formed with dust or gasses is called dry deposition.

The solution is here,

given mass of copper wire(m)=25 g

no. of moles in given mass of Cu=0.393

a) no. of atoms= no. of moles×avogardo's number

=0.393×6.023×10^23=2.36 ×10^23 atoms

b) 25 g of Cu wire has 0.393 moles

so 200 g of Cu wire has 0.393/25 × 200=3.144 mol.

no. of atoms= 3.144×2.023×10^23=1.89×10^24 atoms.

c) 25 g of Cu wire has 2.36×10^23 atoms

so 5 g of Cu wire has (2.36×10^23)/25 × 5

=4.72×10^22 atoms

( b can also be solve like c)

A. N would probably be the one

Answer:

Explanation:

The changes that matter undergoes are associated with properties.

A physical change is one that alters the physical properties of matter. The physical properties of matter tells us everything about what a substance is when no change is occurring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus. Examples are state of matter, colour, odour, taste, texture etc.

In many ways, physical changes are easily reversible and required little energy to initiate. There is no change in mass and no new kinds of matter are produced.

Examples of physical changes are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking of glass, cutting of wood.

Answer:

3>2>1

Explanation:

Liquid 3 is the densest and liquid 1 is the least dense of all. Liquid 2 would be in the middle as its density lies between that of liquids 1 and 3.

Density can be defined as the mass per unit volume of a liquid.

The more the mass the greater the density. Density increases with increasing mass of solute. We see that density shares a direct proportionality with mass.

In terms of volume, the more the volume of solvents the lesser the density. When we dilute some solutions, we tend to reduce their density. Density shares an inverse relationship with volume.

The densest solutions would go below while the least dense goes up.

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