An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?
A.
10
B.
20
C.
30
D.
0
E.
200

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.

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.

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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]

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:

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.

Answer:

deez nuttts

Explanation:

Element 50

Symbol Sn

TIN

The pH of the solution resulting from the dissolution of 106.3 g HCl in 175.0 L of water is 1.77.  

The pH of a solution is given by:

[tex] pH = -log([H_{3}O^{+}]) [/tex]  (1)

Since HCl is a strong acid, we have that:

[tex] [H_{3}O^{+}] = [HCl] [/tex]

We can calculate the concentration of HCl from its mass and the volume of solution:

[tex] [HCl] = \frac{106.3 g}{175.0 L}*\frac{1 mol}{36.46 g} = 0.017 g/mol [/tex]

Hence, the pH is (eq 1):

[tex] pH = -log([H_{3}O^{+}]) = -log(0.017) = 1.77 [/tex]      

Therefore, the pH of the solution is 1.77.

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Answer:

The chemical name ends with “hydroxide.”

Explanation:

1- we write the name of the metal first and after that write the nonmetal:

Ex : NaOH ( sodium hydroxide)

2- any compound contains OH group is an ionic base and this group called hydroxide group

3- "Ous" ending is given in the ions with the lower oxidation.

4- " ic" ending is given in the ions with the higher oxidation.

So, the correct answer is: The chemical name ends with “hydroxide.”.

Answer:

The chemical name ends with “hydroxide

Explanation:

got right on edge 2020

Hello There!

South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams

Answer: The answer would be A;They measure the amount of greenhouse gases in the atmosphere, and the temperature over many years.

Explanation: If scientists only went off of clouds, they'd only be able to tell if it is about to rain. If they only observed the oceans, they'd only be able to tell when a tornado or tsunami was about to occur.

Answer: The answer is A. Thay measure the amount of greenhous gases in the atmosphere and the temperature over many years

Explanation:

Answer:

either 58.1 or 1075

Explanation:

250 / 4.3 = 58.1

250 * 4.3

Iron and aluminum are examples of elements, which are pure substances that cannot be broken down into simpler substances by chemical changes. Both are naturally occurring and widely used in various applications.

Iron and aluminum are examples of elements. Elements are pure substances that cannot be broken down into simpler substances by chemical changes. Iron and aluminum both occur naturally on earth and are widely used in various applications. For example, iron is a key component in steel making and is also an important element in hemoglobin in the blood, while aluminum is a good reducing agent and is used in a multitude of products such as foil and cookware. Other examples of elements include silver, gold, sulfur, oxygen, and copper.

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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)

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:

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:

[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:

Graphite has a giant covalent structure in which:

each carbon atom is joined to three other carbon atoms by covalent bonds

the carbon atoms form layers with a hexagonal arrangement of atoms

the layers have weak forces between them

each carbon atom has one non-bonded outer electron, which becomes delocalised:

A crystal of graphite contains a  covalent structure.

This is an example of a substance with a huge covalent bond structure. It contains a lot of silicon and oxygen atoms. All atoms in the structure are linked to each other by strong covalent bonds. Atoms combine in a regular arrangement to form a huge concurrent structure.

A giant covalent bond structure is a three-dimensional structure of atoms bonded by covalent bonds. Allotropes are different forms of the same element in the same state. Graphite, graphene, and diamond are allotropes of the same element (carbon) in the same state (solid). Carbon can form up to 4 covalent bonds

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A. N would probably be the one

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

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

Answer:

What are the options?

Explanation:

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

Answer: Volume and temperature

Explanation:

Answer:

volume and temperature

Explanation:

Answer:

impossible

Explanation:

Answer:

Kinetic energy

Potential energy

Motion energy

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:

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.

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:

[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.

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.

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.