Given :
An atom of a certain element has 12 protons, 14 neutrons, and 2 valence electrons.
To Find :
The name of this element.
Solution :
We know, element with atomic number ( number of protons ) 12 and valance electrons is Magnesium.
Now, isotope of magnesium of proton with 14 neutrons is Mg-16 .
Therefore, name of element is Mg-16 .
Hence, this is the required solution.
Convert from 300 calories to calories (kicalories)?
Please help mee
Answer:
0.3 kicalories
Explanation:
300/1000
=0.3
PLS GIVE BRAINLIEST
Chemistry, please help
Answer:
yeap this substance can conduct electricity
Give two examples of compounds exhibiting double covalent bonds between atoms of its constituent molecules and explain why they form a double covalent bond.
Answer: Due to the sharing of electrons, they exhibit characteristic physical properties that ... Here, we discuss two classes of compounds based on the bond type that ... Covalent bonds are characterized by the sharing of electrons between two or ... Describe the types of orbital overlap that occur in single, double, and triple bonds
Explanation: That's what I think it is.
A company is using bioleaching to extract copper from copper ores. This involves using bacteria to produce solutions that contain copper
compounds. These solutions are called... what??
Answer:
leachate
Explanation:
Bioleaching. Certain bacteria can break down ores to produce an acidic solution containing copper(II) ions. The solution is called a leachate and the process is called bioleaching . Bioleaching does not need high temperatures, but it produces toxic substances, including sulfuric acid, which damage the environment.
Hope this helps:)
how many sig figs are in 0.0093
Answer:
there are two significant figures
Explanation:
Answer:
there are two
Explanation:
because the zeros dont count
A helium balloon in a closed car occupies a volume of 1.32 L at 30.0°C. If the car is parked on a hot day and the volume of the balloon increases to 2.50 L what is the temperature in the car, assuming the pressure remains constant?
Answer:
T₂ = 573.86 K
Explanation:
Given data:
Initial volume = 1.32 L
Initial temperature = 30.0°C (30+273 = 303 K)
Final volume = 2.50 L
Final temperature in car = ?
Solution:
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₂ = V₂T₁/V₁
T₂ = 2.50 L × 303 K / 1.32 L
T₂ = 757.5 L.K / 1.32 L
T₂ = 573.86 K
Is nucleus a plant or animals cell
If the question is "is there a nucleus in a plant or an animal cell", then the answer is both plant and animal cells have a nucleus.
If the question is "is a nucleus a plant or animal cell", it is neither-- a nucleus is not a cell, but it is an organelle.
I hope this helped!
At the Beltway Outlet store, you buy x computer games for 13$ each and a magazine for 4$. Write an expression in simplest form that represents the total amount of money you spend. Someone please help
Answer:
y = 13x + 4
Explanation:
Given parameters:
number of computer games bought = x
cost of each games = $13
number of a magazine = 1
cost of magazine = $4
Unknown:
Total amount of money spent = ?
Solution:
The total amount spent;
let total amount = y
y = total cost of magazine + total cost of computer games
total cost of magazine =$4
total cost of computer games = 13x
y = 13x + 4
Describe the process of evaporation condensation, and precipitation
Answer:
eva... water to gaseous foum .... condensation liquid to solid and perp ..... water that is falling out of the sky, this could be rain, drizzle, snow, sleet, hail or something rarer!Answer:
Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. Condensation is the process by which water vapor in the air is changed into liquid water.
Explanation:
How is energy causing motion or creating a change in this image? (2 points)
Energy from fuel allows the plant to grow and make its own food.
Energy from the sun allows the plant to grow and make its own food.
Energy from the wind allows the plant to grow and make its own food.
Energy from the water allows the plant to grow and make its own food.
Answer:
Energy from the sun allows the plant to grow and make its own food.
Explanation:
From this image, we clearly see the leaves exposed to sun which supplies solar energy to the plant.
Plants are capable of producing their food from inorganic chemical sources. In the process of photosynthesis, plants takes carbon dioxide and water in the presence of sunlight to manufacture their own food. The food provides energy that allows the plant to grow.Answer:
Energy from the sun allows the plant to grow and make its own food
Explanation:
Relate pH values of 9.1, 1.2, and 5.7 to hydronium and hydroxyl ion concentration.
Answer:
9.1 = basic 1.2= very acidic 5.7= acidic
Explanation:
You can make a solute dissolve more quickly in a solvent by?
A. Adding more solute
B. adding ice
C. Heating the solvent
D. Removing some solvent
The solute molecules will be more readily dissolved in the solvent molecules by heating the solvent. Thus, option C is correct.
The dissolution of solute molecules in the solvent molecules has been based on the attraction between the solute and solvent. The higher interaction between the solute and solvent molecules has been responsible for higher solubility.
The solute molecules have interactions present within them. This limits the interaction of the solute with solvent, and thereby the solubility. With the gain in energy by the solute molecules, there have been lesser interactions between solute molecules, and they are available for interacting with the solvent molecules.
The increased interactions between the solute and solvent molecules by the gain of energy due to heating have been responsible for increased solubility. Thus, option C is correct.
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The table gives the solubility of each substance in 100
g water at 20°C. Use the drop-down menus to rate the solubility of each substance from greatest (1) to least
(4).
Calcium chloride
Calcium bromide
Calcium carbonate
Calcium bicarbonate
Answer:
2 1 4 3
Explanation:
Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore the order of solubility is calcium bromide> calcium chloride>calcium bicarbonate>calcium carbonate.
What is solubility?Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per liter or g/L.
Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule
Calcium bromide is more soluble than calcium chloride as the bond strength in calcium bromide is weaker than calcium chloride. Calcium bicarbonate is more soluble than calcium carbonate.
Therefore the order of solubility is calcium bromide> calcium chloride>calcium bicarbonate>calcium carbonate.
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What will weigh more when a chemical change is complete? The reactants before the
chemical reaction, or the product after the reaction is complete?
A.The reactant will
weigh more than
the product
B. They both will loose
mass after the
reaction
C. They both will weigh
the same
D.The product always
weighs more than
the reactant
Plzzz Hurry!!!!! This is urgent
Answer:
I guessed and got c and got it right
Explanation:
When a chemical change is complete the reactants before the chemical reaction and the products after the chemical reaction will weigh the same.
Explanation:
The law of conservation of mass states that 'in a chemical reaction, mass can neither be created nor be destroyed.In accordance with this law, the total mass of reactants before the chemical reaction is equal to the total mass of the products after the chemical reaction.In chemical reaction mass of the reactants and products remains conserved.The number of atoms on the reactant side is always equal to the number of atoms on the product side.So, from this, we can conclude that when a chemical change is complete the reactants before the chemical reaction and the products after the chemical reaction will weigh the same.
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Which situation provides the best evidence that a chemical reaction is taking place?
Answer: The following can indicate that a chemical change has taken place, although this evidence is not conclusive: Change of odor.
Explanation:
Which of the following best describes a hypothesis?
A. An explanation that is supported by scientific data
B. A proven explanation for experimental results
c. A possible answer to a scientific question
D. A question about the natural world
please help i will give brainliest
9. Which zone of a flame does a goldsmith use for melting gold and silver and why?
Answer:
Outermost zone
Explanation:
Because the outermost zone is the hottest part of the flame.
Answer:
outer most zone
Explanation:
The outermost zone is used by a goldsmith for melting gold and silver. This is because it is the hottest zone of the flame where complete combustion takes place.
explain what is earthquakes and volcanoes
Explanation:
There is no ostensible relation between earthquakes and volcanoes though there are zones on earth where both natural...
• Volcanoes result from openings in the surface of the earth that brings along hot magma (molten rocks) with its wake
Answer:
Earthquakes are when the earth starts to movers and usually cracks open.
Volcanoes are big like of like spouts that go from under the ground to as tall as a small mountain. When erupted the will spit out lava and magma from the top.
Explanation:
Hope this Helps!
:)
Which of these changes to a modern lifestyle would promote the
development of more-sustainable practices in the world food system?
O A. Switching from chicken to beef
B. Eating fewer processed foods
O C. Buying tropical fruits
D. Eating fresh vegetables year-round
Eating fewer processed foods would promote the development of more-sustainable practices in the world food system.
What are Processed food?
This is the food which has undergone some degree of alteration during preparation such addition of preservatives etc.
Eating less of it will ensure that more sustainable practices in the world food system are promoted.
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How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2S
a. 2
b. 4
c. 8
d. 16
Answer:
[tex]\boxed {\boxed {\sf C. \ 8 \ hydrogen \ atoms}}[/tex]
Explanation:
There are "2 parts" to the molecule S(NH₄)₂
The ammonium (NH₄) The sulfide (S)Let's focus on the ammonium, since it contains the hydrogen.
There is 1 Nitrogen atom (no subscript) and 4 hydrogen atoms ( subscript of 4).
But, this is only for 1 molecule of ammonium. If we look back at the original molecule, there is a subscript of 2 around (NH₄). This indicates there are 2 molecules of ammonium.
There are 4 hydrogen atoms in 1 molecule. So, to find the number in 2 molecules, simply multiply 4 by 2.
4 H atoms in 1 molecule * 2 molecules = 8 H atomsThere are 8 hydrogen atoms in S(NH₄)₂
Help please! A gas occupies 500 mL at 270 mm Hg and 55°C. If the pressure is changed to 1.8 atm and the temperature is
increased to 100°C, what is the new volume? Be sure to show the setup and the final answer and unit.
Show Your Work
Answer:
V₂ = 112.14 mL
Explanation:
Given data:
Initial volume = 500 mL
Initial pressure = 270 mmHg (270/760 =0.355 atm)
Initial temperature = 55 °C (55 +273 = 328 K)
Final temperature = 100°C (100+273 = 373 K)
Final volume = ?
Final pressure = 1.8 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 0.355 atm × 500mL × 373 K / 328 K × 1.8 atm
V₂ = 66207.5 atm .mL. K / 590.4 K.atm
V₂ = 112.14 mL
Can someone please help me with this?--20 pts!
In Compound A, Element W has an electronegativity of 3.0, and Element X has an electronegativity of 2.0.
In Compound B, Element Y has an electronegativity of 1.2, and Element Z has an electronegativity of 3.4.
Which statement correctly identifies the ionic compound and describes the use of electronegativity in determining this?
Compound B is ionic. The electronegativity difference is 2.2, which can be determined by subtracting the electronegativity of Element Y from that of Element Z. Electronegativity differences greater than 1.7 indicate ionic bonds.
Compound B is ionic. The electronegativity difference is 4.6, which can be determined by adding the electronegativity of Element Y to that of Element Z. Electronegativity differences less than 5.0 indicate ionic bonds.
Compound A is ionic. The electronegativity difference is 5.0, which can be determined by adding the electronegativity of Element W to that of Element X. Electronegativity differences greater than or equal to 5.0 indicate ionic bonds.
Compound A is ionic. The electronegativity difference is 1.0, which can be determined by subtracting the electronegativity of Element X from that of Element W. Electronegativity differences less than 1.7 indicate ionic bonds.
Answer:
Compound B is ionic. The electronegativity difference is 2.2, which can be determined by subtracting the electronegativity of Element Y from that of Element Z. Electronegativity differences greater than 1.7 indicate ionic bonds.
Hope that helps.
The statement correctly identifies the ionic compound and describes the use of electronegativity in determining this is Compound B is ionic. The electronegativity difference is 2.2, which can be determined by subtracting the electronegativity of Element Y from that of Element Z. Electronegativity differences greater than 1.7 indicate ionic bonds. Therefore, option A is correct.
What is an ionic compound ?A chemical compound known as an ionic compound is one that contains ions bound together by the electrostatic forces known as ionic bonding. Despite having both positively and negatively charged ions, or cations and anions, the molecule is generally neutral.
Ions are charged particles that occur when an atom (or group of atoms) receives or loses electrons. Ionic compounds are substances made of ions. When elements share electrons in a covalent connection to create molecules, they produce covalent or molecular compounds.
Ions form the bulk of an ionic composition. The ions are organized into a regular, repeating structure known as an ionic lattice. Because the ions are attracted to one another and arrange themselves in a predictable pattern with oppositely charged ions close to one another, a lattice is created.
Thus, option A is correct.
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How many moles are equal to 1.3 x 1024 atoms of aluminum?
Answer:
The answer is 2.16 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1.3 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 2.159468...[/tex]
We have the final answer as
2.16 molesHope this helps you
PLEASE HELPPP !!!!!!!!!!!!!!!!
Answer:
I think it's the last one I'm sorry if it's wrong
Explanation:
it sounds like it fits
Addie mixes together a solution of 10 grams of
salt and 15 mL of hot water. What is the total
mass of the solution?
Answer: 150 grams
Explanation: m = V × ρ
= 15 milliliter × 10 gram/cubic centimeter
= 15 cubic centimeter × 10 gram/cubic centimeter
= 150 gram
How many protons, electrons, and neutrons does an atom with an atomic
number 50and a mass number 120 contain?
Answer:
Protons: 50
Neutrons: 70
Electrons: 50
Explanation:
atomic number 50 is
Tin(Sn)
Protons=50
Neutrons=69
Elections=50
Record the mass of the object based on the reading from the triple-beam balance. The mass of the object is ____ grams.
Hello!
[tex]\large\boxed{167g}[/tex]
Looking at the balance, we see that:
The middle beam reads 100g.
The top beam reads 60g.
The bottom beam reads 7g.
Add all of the numbers together to get the total mass:
100 + 60 + 7 = 167g.
The mass of the object is 167 grams.
Explanation:
A triple beam balance is a mass measuring instrument used in labs to measure the mass of a substance. It unit in which it measures is grams. It consists of three beams which are: The middle beam has Increments of 100 grams The front beam has Increments from 0 grams to 10 grams The farther beam has Increments of 10 gramsGiven :
Readings of all the scales of three beams of the triple beam balance of an object.
To find :
The mass of object whose reading on triple beam balance is given.
Solution:
Middle beam reader at 100 grams
Front beam reader at 7 grams
Farther beam reader at 60 grams
The mass of object:
[tex]100 grams + 7 garms + 60 grams = 167 grams[/tex]
The mass of the object is 167 grams.
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Farmers use conservation practices such as crop rotation to insure that their crops are sustainable. Crop rotation is the process of moving crops to a new location to get the nutrients from the soil needed for that specific crop to grow. What conclusion can be drawn if farmers do not use soil conservation practices such as crop rotation?
A.
If farmers do not use soil conservation practices, the topsoil, which contains weathered rocks, will not be fertile to promote plant growth because of loss of nutrients from the soil.
B.
If farmers do not use soil conservation practices, the topsoil, which contains weathered rocks, will be fertile to promote plant growth because of the loss of nutrients from the soil.
C.
If farmers do not use soil conservation practices, the topsoil, which contains humus, will not be fertile to promote plant growth because of the loss of nutrients from the soil.
D.
If farmers do not use soil conservation practices, the topsoil, which contains humus, will be fertile to promote plant growth because of the loss of nutrients from the soil.
Answer:
C. If farmers do not use soil conservation practices, the topsoil, which contains humus, will not be fertile to promote plant growth because of the loss of nutrients from the soil.
Explanation:
The top soil is rich in humus and not weathered materials. It is not close to the bedrock. Rather, the topsoil is rich in organic matter and it is present as humus in the soil.
If crop rotation is not being practiced, the soil's nutrients would be highly depleted without replenishing them back. With crop rotation the top soil can be made more fertile when it is left uncultivated for a period of time. Instead of heavily relying on a single piece of land, crops can rotated on a timed basis so that soils will have enough time to restore their nutrients.An element ‘A’ has valency +3, while another element ‘B’ has valency -2. Give the formula of their
compound formed when ‘A’ reacts with ‘B’.
Answer:
A2B3...........................
Help please If there are 10 moles of HCl gas occupying 15L at 350°C, what is the pressure? Be sure to show the setup and
the final answer and unit.
Show Your Work
Answer:
P = 34.1 L
Explanation:
Given data:
Number of moles = 10 mol
Volume occupy = 15 L
Temperature = 350°C
Pressure of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
350+273 = 623 K
by putting values,
P×15 L = 10 mol ×0.0821 atm.L/ mol.K ×623 K
P = 511.48atm.L/15L
P = 34.1 L