Answer:When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. ... They contract when they lose their heat.
Explanation:Google
could some some one help with 2 4 5 7 8
Answer:
For number 2, your answer is C.
Explanation:
The nucleus is positively charged because the proton is positive and a neutron is neutral. An electron has a negative charge.
Cl2 and N2 react according to the following equation 3Cl2(g) + N2(g) rightarrow 2NCl3(g) If 4 L of a stoichiometric mixture of chlorine and nitrogen are converted to nitrogen trichloride under conditions of constant temperature and pressure what is the volume of NCl3(g) produced?
Answer:
Volume of NCl3 is 3L
Explanation:
Avogadro states: All gases at the same volume under temperature and pressure constant have the same number of moles.
The chemical equation is:
3Cl2(g) + N2(g) → 2NCl3(g)
Where 3 moles of chlorine reacts with 1 mole of nitrogen to produce 2 moles of NCl3.
But using Avogadros law we can say:
3L of chlorine and 1L of nitrogen produce 2L of Nitrogen trichloride.
3L of chlorine and 1L of nitrogen: 4L (The stoichiometric mixture)
That means, volume of NCl3 produced is 3L
2) Alum has twelve hydrated water molecules. Are these included in the molecular weight?
Why?
Answer:
The dot between KAl(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of KAl(SO4)2. Therefore, the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
Explanation:
The mass of the twelve water molecules are included in the molecular weight of the compound ,therefore the given statement is true.
What do you mean by molecular weight?Molecular weight is the sum of all atoms in a molecule. Molecular weight is represented in the atomic mass unit . It tells us the number of grams of a substance is present in one mole of that compound.
Molecular weight is based on the molecular formula of a compound.
According to the question, the dot between K Al(SO4)2 and 12 H2O in the formula indicates that twelve moles of water are associated with every mole of K Al(SO4)2.
And because of this the mass of the twelve water molecules, called the waters of hydration, must be included in the molecular weight of the compound.
The twelve hydrated water molecules of alum are included in the molecular weight, hence the given statement is true.
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A sample of gas has an initial volume of 3.00 L and an initial pressure of 2.14 atm. If the volume expands to 8.15 L, what is the final pressure?a. 0.855 atm b. 0.788 atm c. 3.49 atm d. 5.81 atm
Answer:
The final pressure is 0.788 atm (option b).
Explanation:
Boyle's law says that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases. This is expressed mathematically as the product of pressure times volume equal to a constant value:
P*V=k
Assuming a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:
P1*V1=P2*V2
In this case:
P1= 2.14 atmV1= 3 LP2= ?V2= 8.15 LReplacing:
2.14 atm*3 L= P2* 8.15 L
Solving:
[tex]\frac{2.14 atm*3 L}{8.15 L} =P2[/tex]
0.788 atm= P2
The final pressure is 0.788 atm (option b).
Ms. Cristell, a seventh-grade teacher at OHVA, made the following statement, "Sound energy, also known as acoustic energy, is a type of mechanical energy." Why are sound waves considered a type of mechanical energy? Sound waves can travel through space Sound waves can travel through a solid Sounds waves are made by machines Sound waves transfer energy by the motion of particles
Answer:
The answer is D
Explanation:
I recently took a test with the same question and it said the answer was correct
I hope this helps and have a nice day <3
Answer:
WOWOWWOWOOWOWOWOW
Explanation:
What happened to liquid materials when mixed with other liquids
Answer:
they remain liquid
Explanation:
because liquid in liquid mostly doesn't have any affect on the state of the matter
as,
water added to juice
remains liquid
Which of the following elements is the most reactive?
a
Beryllium
b
Calcium
c
Magnesium
d
Barium
Explanation:
The answer would be Berium because it can mix as well with other elements in the periodic table.
Barium is regarded as the most reactive elements out of all the options
provided.
Barium is an element with symbol Ba and atomic number 56. It belongs to
Group 2 metals whose reactivity increases as we go down the group.
The alkaline earth metals which are in Group 2 of the Periodic Table include
: beryllium, magnesium, calcium, strontium, barium, and radium
The increase in reactivity down the group is as a result of the decreasing
ionization energy required to form new compounds. The Ionization energy
decreases due to more inner shells and increase in distance from the
nucleus.
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Which of the following best describes the “social sciences”? Sciences that focus on researchers conducting objective studies Sciences that are able to objectively measure human behavior Sciences that focus on human behavior and society Sciences that objectively measure natural phenomena
Answer:
human behovoir
Explanation:
Help Please..... Points Available!
I will give brainliest!!
Answer:
I think Its B
Explanation:
Answer:
the answer is:
no, because the reactivity of elements decreases from right to left on the periodic table.
Explanation:
In Metals:
Period - reactivity decreases as you go from left to right.
Group - reactivity increases as you go down a group
In Non-metals
Period - reactivity increases as you go from the left to the right.
Group - reactivity decreases as you go down the group.
Reactivity:
The reactivity of the elements increases going from left to right on the periodic table. Each element going from left to right tends to be more reactive. The electronegativity increases going from left to right, and it decreases going down the table.
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How many tons of asphalt concrete will be required to overlay a 2.5 mile long 24 ft wide road with 3in of wearing course asphalt concrete that has a density of f 147.9PCF?
Answer:To determine the weight of the asphalt needed, first determine the area of the surface to be paved.
Since the shape of the road is a rectangle, use the formula of area of rectangle.
A = Length xx Width
Before plugging-in the values, convert the 2.5 miles to feet in order that the dimension to have same unit.
So,
2.5 mi xx (5280 ft)/(1mi) = 13200ft
Now that the length is in feet, plug-in the values of dimension of the road to the formula of area of rectangle.
A=13200*24
A=316800
Hence, the area to be paved is 316 800 ft^2 .
Next, determine the volume. Use the formula:
V = Area xx thickness
Before substituting the values, convert the thickness to feet in order to have same units.
So,
3 i n xx (1ft)/(12 i n)=0.25ft
Then, substitute the values of the area and thickness to the formula of volume.
V=316800*0.25=79200
Thus, the volume of the asphalt needed is 79200 ft^3.
Next, to determine its weight , multiply that with the given density 1479 pounds per cubic feet (1479 lb/ft^3).
W=79200*1479=117136800
So, the weight is 11 7136 800 lbs.
Then, convert it to tons.
117136800 lbs xx (1t o n)/(2000lbs) = 58568.4 t o n s
Explanation:i did the math
Which of the following is not a part of the carbon cycle
Answer:
condensation is NOT part of the carbon cycle
Explanation:
Why does crash affect the motion of the objects?
Answer:
When something crashes it affects the motion of an object because what it crashed into had force going in the opposite direction.
Explanation:
what is used to help water wash away greasy dirt
Answer:
soap
Explanation:soap
Answer:
A molecule with polar and nonpolar ends
Explanation:
The number of protons in an atom is known as its atomic.
Answer:
The number of protons in an atom is unique to each element. For example, carbon atoms have six protons, hydrogen atoms have one and oxygen atoms have eight. The number of protons in an atom is referred to as the atomic number of that element. The number of protons also determines the chemical behavior of the element. GOOD LESSONS ♡
The barcoding process begins with
Answer:
Explanation:
It starts with the company getting a GS1 Company Prefix Before a firm starts to use a barcode it has to come up with the GS1 Identification Keys which are the numbers that represent the company’s barcode. When the GS1 identification key is assigned, the firm acquires the GS1 Company Prefix that will enable the firm to create the identification keys for its goods, locations, trade items and coupons which will be unique to it worldwide.
Which statement explains why a rock does not sink in a lake that is frozen over?
1. Particles are much harder in a solid than in a liquid.
2. Particles are much closer together in a solid than in a liquid.
3. Particles in a solid are moving too fast for anything to penetrate them.
4. Particles in a solid are fixed in place.
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If you mass 0.430 g of Co(NO3)2 6H2O and dissolve it in water, what further information would you need to calculate:_________.
a. the number of moles of Co(NO3)2 in the solution?
b. the molarity of the solution
Answer:
a. No information is required.
b. The volume of the solution.
Explanation:
Hello!
In this case, since hydrates are salts which have additional water in their structures, when making mole-mass calculations involving them, we need to consider the how many water molecules we find in the hydrate. In such a way, for 0.430 g of cobalt nitrate hexahydrate (six water molecules), we proceed as follows:
a. Since we have 0.430 g of hydrate, we may compute the moles of anhydrous cobalt nitrate by using the molar mass of the hydrate (291.04 g/mol) and then, by noticing that one mole hydrate has one mole of anhydrous, we are able to compute the moles of anhydrous cobalt nitrate as shown below:
[tex]0.430gCo(NO_3)_26H_2O*\frac{1molCo(NO_3)_26H_2O}{291.04gCo(NO_3)_26H_2O} *\frac{1molCo(NO_3)_2}{1molCo(NO_3)_26H_2O}\\\\=1.48x10^{-3}mol Co(NO_3)_2[/tex]
It means no further information is required.
b. Since the molarity is defined by the division of the moles of solute over liters of solution (M=mol/V), we would need the volume of the solution to successfully compute it.
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A gas made up of homonuclear diatomic molecules escapes through a pinhole 1.37 times as fast as cl2 gas. Write the chemical formula of the gas.
Answer:
F₂
Explanation:
Let the R₁ represent the rate of diffusion of Cl₂
Let R₂ represent the rate of diffusion of the gas.
Let M₁ represent the molar mass of Cl₂
Let M₂ represent the molar mass of the gas.
From the question given above, the following data were obtained:
NOTE: Assume the rate of diffusion of Cl₂ is 1.
Rate of diffusion of Cl₂ (R₁) = 1
Rate of diffusion of the gas (R₂) = 1.37 times R1 = 1.37 × 1 = 1.37
Next, we shall determine the molar mass of the gas. This can be obtained as follow:
Rate of diffusion of Cl₂ (R₁) = 1
Molar mass of Cl₂ (M₁) = 35.5 × 2 = 71 g/mol
Rate of diffusion of the gas (R₂) = 1.37
Molar mass of the gas (M₂) =?
R₁/R₂ = √(M₂/M₁)
1/1.37 = √(M₂/71)
Square both side
(1/1.37)² = M₂ /71
1/1.8769 = M₂ /71
Cross multiply
1.8769 × M₂ = 71
Divide both side by 1.8769
M₂ = 71 / 1.8769
M₂ = 37.8 g/mol
Since the gas is a homonuclear (the same element) diatomic molecule, we shall divide the molar mass of the gas molecule by 2 to obtain the molar mass of the element that makes up the molecule. This is illustrated below:
Molar mass of the element = 37.8 / 2
Molar mass of the element = 18.9 g/mol
Comparing the molar mass of the element with those in the periodic table, the element that makes up the gas is fluorine. Thus the molecular formula of the gas F₂.
please help if you get this right i will give brainliest will give 30 points
Answer:
change in size or shape
Explanation:
Answer: hey
Explanation:
What is oxidized in a galvanic cell? O A. The salt bridge O B. The electrolytes O C. The cathode D. The anode
Answer:
D. The anode
Explanation:
The anode is oxidized in a galvanic cell. Therefore, option D is correct.
What is a galvanic cell?A galvanic or voltaic cell is an electrochemical device that transforms the chemical energy of spontaneous redox reactions into electrical energy. electrical cell A voltaic cell is an electrochemical device that produces electricity through chemical processes.
An electrochemical cell called a galvanic cell or voltaic cell, respectively named after the scientists Luigi Galvani and Alessandro Volta produces an electric current by spontaneous oxidation-reduction reactions.
Since electrons are left on the electrode when oxidation occurs, the anode, the electrode where oxidation happens, is the negative electrode in a galvanic cell.
Thus, option D is correct.
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what type of motion is illustrated in the diagram below?
Idenify each statement below as either oxidation or reduction.
1.
Occurs when atoms gain electrons during bonding.:
2.
Occurs when the oxidation number of an element decreases in chemical reaction.:
3.
Occurs when atoms lose electrons during bonding.
4.
F + e- ----> F-
5.
Occurs when the oxidation number of an element increases in chemical reaction.:
Occurs when the oxidation number of an element increases in chemical reaction.
6.
2I- ----> I2 + 2e-
Answer:
Explanation:
An oxidation reaction has the following properties;
addition of oxygen removal of hydrogenloss of electronsincrease in oxidation numberincrease in the number of electronegative atom surrounding an element in changing from reactants to products.The reduction reaction is the opposite of the points mentioned above;
1. Occurs when atoms gain electrons during bonding: Reduction
2. Occurs when the oxidation number of an element decreases in chemical reaction: Reduction
3. Occurs when atoms lose electrons during bonding: Oxidation
4. F + e- ----> F- : Reduction
5. Occurs when the oxidation number of an element increases in chemical reaction: Oxidation
6. 2I- ----> I2 + 2e- : Oxidation
An atom has an atomic number of 19 and a mass number of 29. How many neutrons are in the atom?
Answer:
10
Explanation:
You take the atomic number and subtract it from the atomic mass. So in this case it would be 29-19 thus giving us 10.
which of these zones of the ocean is most hospitable to life?
epipelagic
hadalapic
bathypelagic
abyssopelagic
Answer:
The correct answer is the epipelagic zone
What type of alloy will C and Fe form?
A. Substitutional alloy
B. Structural alloy
C. Composite
D. Interstitial alloy
what is biochemistry
Answer:
Biochemistry or biological chemistry, is the study of chemical processes within and relating to living organisms
Explanation:
Iron react with oxygen to form Iron (III) Oxide. How many moles of iron (III) Oxide is in 138.5g?
Answer:
0.87mole
Explanation:
The reaction equation is given as;
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe₂O₃ in 138.5g
To solve this problem;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Fe₂O₃ = 2(56) + 3(16) = 160g/mol
Now;
Number of moles = [tex]\frac{138.5}{160}[/tex] = 0.87mole
Write a mechanism for the Williamson ether synthesis of 1-methoxy-4-propoxybenzene from 4-methoxyphenol and propyl bromide. Be as complete as possible and show electron flow for all steps.
Answer:
(Mechanism in attachment).
Explanation:
The Williamson ether synthesis is the most used method to form ethers, in which an alkoxide ion reacts with a primary alkyl halide in an SN₂ reaction. Usually, the alkoxide ion is prepared by the reaction of an alcohol with a strong base like sodium hydride, NaH.
The alkyl halide must be primary so an attack by the backside is not impeded. When the alkyl halide is not primary, the result is usually an elimination.
Mechanism
Step 1: form the alkoxide of the alcohol considering the most impeded group (in this case, the 4-methoxyphenol).
Step 2: the alkoxide displaces the leaving group from a good SN₂ substrate (the propyl bromide).
Therefore, in Williamson ether synthesis, the alkyl halide must be a good SN₂ substrate (generally primary). We choose the alkyl group less impeded to be the halide and the most impeded group to be the alkoxide ion.
What is the most effective method for monitoring the effects of global warming?
Monitor the amount of carbon dioxide in the atmosphere.
Monitor the number of miles traveled by people in cars each year.
Monitor the amount of greenhouse gases put out by factories.
Monitor the sea level over set period of time.
Answer: D) Monitor the sea level over set period of time.
Since global warming causes land ice to melt, that water goes into the ocean to raise sea levels. This is an effect of global warming.
Choices A through C are things to measure if you want to measure causes of global warming, so we can rule those out.
Can someone do my chemistry work? I'll pay you, also comment your socials please so I can contact and show you the questions!
Answer:
Stan Loona
Explanation:
Answer:
i dont feel like sending out my socials but if you can send me a picture of the problems on here i would be happy to help for free
Explanation:
i dont know if im going to be right about the questions but i can try
