Answer:
True
Explanation:
Because the sun is a star, all stars eventually explode after a certain amount of time
Answer:
True
Explanation:
The sun will become a red giant and increase in size. During that time, the earth will increase in 1 degree each day making it inhabitable to live
Which of the following elements will sulfur most readily react with in order to help it fill its outer shell with 8 electrons?
arsenic (As)
astatine (At)
argon (Ar)
magnesium (Mg)
Answer:
Magnesium
Explanation:
Using the KLMN styled electronic configuration, the electronic configuration of sulphur with atomic number 16 is 2, 8,6
What this means is that it needs extra 2 electrons to fill into its M shell to attain the octet configuration.
Now let’s look at Magnesium, with atomic number 12, the electronic configuration it has is 2,8,2.
This means it has 2 extra electrons to give away so as to attain its own stability.
The sulphur atom will gladly accept the two electrons which the magnesium atom wants to give away. This makes it the perfect element to be reacted with sulphur to make it attain its octet configuration
How many moles of CO2 is needed to fill an 80.0 L tank to a pressure of 150.0 atm at 27.0°C?
Answer:
487 moles of CO2 is needed
Explanation:
What we need to use here is the ideal gas equation.
Mathematically;
PV = nRT
Since we are calculating the number of moles, we can rewrite the equation to be;
n = PV/RT
from the question, we identify the following;
P is the pressure at 150 atm
V is the volume at 80L
T is the temperature which is 27+273 = 300K
R is the molar gas constant which is 0.0821 L atm K^-1 mol^-1
Substituting these values, we have;
n = (150 * 80)/(0.0821 * 300) = 487.2 which is approximately 487 moles
Which element below contains 10 protons?
the le answer to dis problem is neon. it has 10 protons
why our clothes dry quickly when there is a breeze?
Explanation:
When the water evaporates from your clothes, it will "hang around" around it. If there is little or no air movement, this means that the air surrounding the fabric is saturated with moisture, which means it will not evaporate more. The breeze will move the moisture-saturated air away from the fabric, until more water evaporates.
A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below. HCl + NaOH Right arrow. NaCl + H2O What was the original concentration of the HCl solution? 0.040 M 0.25 M 1.50 M 2.50 M
Answer:
0.040M
Explanation:
The following data were obtained from the question:
Volume of acid (Va) = 150mL
Volume of base (Vb) = 60mL
Molarity of base (Mb) = 0.1M
Molarity of acid (Ma) =..?
Next, the balanced equation for the reaction. This is given below:
HCl + NaOH —> NaCl + H2O
From the balanced equation above,
The mole ratio of the acid (nA) = 1
The mole ratio of the base (nB) = 1
Finally, we shall determine the concentration of the acid, HCl as follow:
MaVa / MbVb = nA/nB
Ma x 150 / 0.1 x 60 = 1/1
Cross multiply to express in linear form
Ma x 150 = 0.1 x 60
Divide both side by 150
Ma = 0.1 x 60 / 150
Ma = 0.04M
Therefore, the concentration of the acid is 0.04M
Answer:
0.040M
Explanation:
just took the review
Which part or parts of the paragraph indicate the relationship between public support and the enforcement of environmental policies?
A new manufacturing company was the brainchild of five engineers. They created a device that controls a company’s carbon footprints. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints. They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
Answer:
It is.. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.
They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
Explanation:
The paragraph that indicates the relationship between public support and the enforcement of environmental policies are:
C. To spread awareness for their own benefit, they proposed a legislative bill related to tracking and controlling carbon footprints.
D. They constantly followed up with congressional representatives and found a sponsor and several co-sponsors for the bill.
What are environmental policies?Environmental policies are the policies made by the government to save the environment and animals from hunters, and predators. Environmental policies include preventive areas and rules for humans to behave in natural resources.
Thus, the correct options are C and D.
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what does heat, enthalpy, entropy and free energy all have in common
Answer: Free energy combined enthalpy and entropy into a single value. Gibbs’s free energy is the energy associated with a chemical reaction that can do useful work. It equals the enthalpy minus the product of temperature and entropy of the system.
Explanation:
Given 700 ml of oxygen at 7 ºC and 106.6 kPa pressure, what volume does it take at 27ºC and 66.6 kPa pressure
Answer:
1.20 L = 1200 mL
Explanation:
P1V1/T1 = P2V2/T2
V2 = P1*V1*T2/(T1*P2)
V1 = 700ml =0.700 L
P1 = 106.6 kPa
T1 = 7+273.15 = 280.15 K
T2 = 27 + 273.15 = 300.15 K
P2 = 66.6 kPa
V2 = 106.6*0.700*300.15/(280.15*66.6)= 1.20 L=1200 mL
Which element would you expect to behave the most like carbon (C)?
O A. Germanium (Ge)
O B. Phosphorus (P)
O C. Nitrogen (N)
O D. Oxygen (0)
Which element would you expect to behave the most like carbon ( C ) ?
● A. Germanium (Ge) ✔
O B. Phosphorus (P)
O C. Nitrogen (N)
O D. Oxygen (0)
The statement for the element would expect to behave the most like carbon (C) is "Germanium (Ge)."
What is an element?An element is a substance that cannot be divided into smaller components through normal chemical processes. All matter is composed of elements, which are the basic building blocks.
Carbon (C), silicon (Si), germanium (Ge), tin (Sn), lead (Pb), and flerovium (F) are the six chemical elements that make up Group 14 (IVa) of the periodic table (Fl). That is, germanium and carbon belong to the same family.
Therefore, Germanium (Ge) element expect to behave the most like carbon (C).
Hence the correct answer is A.
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Which general formula represents the compound CH3CH2CHCH2?
A) CnH2n + 2
B) CnH2n – 2
C) CnHn
D) CnH2n
what is microbial oxidation?
Answer:
Bacteria biooxidation is an oxidation process caused by microbes where the valuable metal remains (but becomes enriched) in the solid phase. In this process, the metal remains in the solid phase and the liquid can be discarded.Hope it helps you!
Answer Microbial oxidation of sulfur is the oxidation of sulfur by microorganisms to produce energy. The oxidation of inorganic compounds is the strategy primarily used by chemolithotrophic microorganisms to obtain energy in order to build their structural components, survive, grow and reproduce.
Explanation:
Click on the diagram to choose which atom is more reactive. Hint: These are nonmetals. Which is going to gain a full valence shell of 8 electrons the easiest?
Answer:
The first one has 5 valence electrons, and the second has 7. (This can be counted by counting the amount of black dots on the biggest circle). Since 7 > 5, it would be easier for the second one to gain one (so that it completes it's valence shell) so the answer is the second one.
Briefly define weather,season and Climate.
Answer:
this is an answer to your question in explanation
Explanation:
Weather is the atmospheric conditions, including the temperature, wind, snow, rain, or anything else happening outside
season is one of the four division in a calendar year
Climate is the longstanding average weather of an area.
Weather, state of the atmosphere at a particular place during a short period of time.
A season is a division of the year marked by changes in weather, ecology, and the amount of daylight.
Climate is defined as an area's long-term weather patterns.
Question 12
2 pts
A gas is initially at STP. When heated to 25°C what will the pressure be in atmospheres
assuming constant volume and moles?
Answer:
Pressure initially is 760 torr.
Temperature is at 273.15
Temperature is increased to 298.15
Pressure increases by a factor of 298.15 / 273.15 = 1.0915248032
760 * 1.0915248032 = 829.558850432 torr
Explanation:
Which of the following are considered pure substances? element compound homogeneous mixture heterogeneous mixture
Answer:
element and compound.
Explanation:
reason
an element is a pure substance that cannot be broken down into simpler substances by any ordinary physical or chemical process.
and compound is a pure substance that consists of two or more elements held together in fixed proportions by natural forces called chemical bonds.
homogeneos and heterogenous mixtures are considered impure substances because they dont have a definite composition.
In chemistry, pure substances have been defined by matter that has characteristic properties. An element and compound are pure substances. Thus, options 1, and 2 are correct.
What are pure substances?Pure substances have been the matter that is characterized by the presence of a fixed chemical composition that cannot be physically separated by the processes like filtration, evaporation, etc.
Elements and compounds are pure substances as elements are not broken physically or chemically to form simple -small substances like zinc. Furthermore, compounds are formed by the combination of pure substances like water.
Homogeneous mixtures and heterogeneous mixtures are not pure substances as they lack fixed ratios and proportions that cannot be said to have definite composition.
Therefore, options 1 and 2. are elements and compounds are pure substances.
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Which element when combined with chlorine would most likely form an ionic compound
Answer:
Na (Sodium)
Explanation:
Sodium is a metal, and when combined with Chlorine (which is a non-metal) it creates an ionic compound
Option C is correct. The Sodium combined with Chlorine to form an ionic compound.
Ionic Compound:
These are the compounds that are made up of two ions, one positive and one negative. In the solution, they conduct electricity. They formed when a metal interacts with a non-metal.
For example- NaCl
NaCl in the water solution form positive Sodium and Negative Chlorine ion. The solution of NaCl conduct electricity,Na is a metal while Cl is a non- metal. Oxygen, Carbon and phosphorus are non-metal, they will not form an ionic compound.Therefore, the Sodium combined with Chlorine to form a an ionic compound.
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N2 + 3H2 —> 2NH3
If 35.0g of nitrogen gas are mixed with 12.0g of hydrogen gas, what mass of ammonia is produced?
Explanation:
47.0g is the mass of ammonia
What is the molality of a solution that has 4 mol of KCI in 0.800 kg of water
Answer:
Option A. 4mol/0.800Kg
Explanation:
Data obtained from the question include:
Mole of solute = 4 moles
Mass of water = 0.800Kg
Molality =.?
Molality of a solution is simply defined as the mole of solute per unit kilogram of solvent. Mathematically, it is expressed as:
Molarity = mole of solute / Kg of solvent
With the above formula, we can obtain the molality of KCl solution as follow:
Molality = 4mol/0.800Kg
Answer: A
Explanation:
In an electron dot diagram what is the maximum number of dot surrounding a symbol. A. 8 B.4 C. 2 D.10
Answer:
A. 8
Explanation:
8 valence electrons means you have a full shell.
If the neutral solution was boiled to dryness, what would be the formula of the resulting salt.
Answer:
Forumula
XOH + HY = XY + H2O
Explanation:
Salt formed from: Salt Solution
Strong acid + Strong base Neutral
Strong acid + Weak base Acidic
Weak acid + Strong base Basic
Neutral solution example
NaCl = Sodium chloride
HCl = H+ and Cl-
NaOH = Na+ and OH-
OH- = Strong Base
H+ = Strong Acid
Sodium chloride, formed from neutralization of HCl by NaOH.
NaOH + HCl = NaCl + H2O
NaCl in water is not acidic or basic, since it's ions cannot hydrolyze.
So formula would be XOH + YH = XY + H2O
Why does the source of chemical energy from wood can be renewed? A. Cells in the wood constantly produce chemical energy. B.Wood can constantly obtain chemical energy from the Sun. C.Wood has unlimited supply of chemical energy. D.Wood is from living organisms.
The source of chemical energy from wood can be renewed as wood can constantly obtain chemical energy from the sun as it is a renewable source of energy.
What is chemical energy?
Energy which is stored in the chemical bonds of chemical compounds is called chemical energy.Chemical energy is released during the occurrence of chemical reaction.Reactions wherein energy is given out in the form of heat is called exothermic reactions.
Chemical energy can be converted to other forms of energy like electrical energy during the process of electrolysis and to thermal energy as in the case of thermal engines.
It can also be converted to kinetic energy during explosions . It is stored in batteries, coal, biomass, food, vehicle air bags,etc.Chemical energy of plants is utilizes during the process of photosynthesis.
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Dry petals of a base x when kept in open absorbs moisture and turns sticky . The compound is also formed by chlor-alkali process . Write the chemical name of x
Answer: Sodium Hydroxide (NaOH)
Explanation: Sodium Hydroxide also known as Cautious Soda is a compound comprising of Sodium cations and Hydroxide anions.
It is white and in form of opaque crystals.
It is anhydrous and completely soluble in water.
It is also a Hygroscopic compound which explains its absorption of water from the air.
Sodium Hydroxide is also formed by a chlor alkali process which is an industrial processes used for the electrolysis of sodium chloride solutions.
This process produces sodium hydroxide and chlorine.
See simple equation below;
2NaCl + H2O ---> 2NaOH + Cl2
[ ]transport moves substances from an area of high concentration to an area of low concentration.
Answer:
The answer is Diffusion.
Explanation:
Diffusion is a movement of molecules(substances) from a region of high concentration to a region of low concentration down a concentration gradient.
Answer:
Active
Explanation:
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy.
If 10.0 liters of h2(g) at STP is heated to a temperature of 546 K, pressure remaining constant, the new volume of the gas will be
Answer:
20L
Explanation:
The following data were obtained from the question:
Initial volume (V1) = 10L
Initial Temperature (T1) = stp = 273K
Final temperature (T2) = 546K
Final volume (V2) =..?
The new volume of the gas can be obtained by using the Charles' law equation as shown below:
V1/T1 = V2/T2
10/273 = V2/546
Cross multiply to express in linear form
273 x V2 = 10 x 546
Divide both side by 273
V2 = (10 x 546) / 273
V2 = 20L
Therefore, the new volume of the gas is 20L.
A chemist dilutes 185 of the 3.0 M solution with water until a new volume of 750 is obtained. Calculate the new concentration
Answer:
0.74M
Explanation:
Step 1 :
Data obtained from the question.
Initial concentration (C1) = 3M
Initial volume (V2) = 185mL
Final volume (V2) = 750mL
Final concentration (C2) =..?
Step 2:
Determination of the new concentration of the solution.
The new concentration of the solution can be obtained by using the dilution formula as shown below:
C1V1 = C2V2
3 x 185 = C2 x 750
Divide both side by 750
C2 = 3 x 185 / 750
C2 = 0.74M
Therefore, the new concentration of the solution is 0.74M
What is the lowest energy level that contains d orbitals?
O A. 4
O B. 1
O c. 3
O D. 2
Answer: C. 3
Explanation: 3 is the lowest energy level that contains d orbitals.
Given the unbalanced equation below, how many moles
of Li would be needed to produce 6 moles of LiCl?
Li + Cl2 → Lici
Answer: 6 mol Li
Explanation:
The first step is to balance the equation.
2Li+Cl₂⇒2LiCl
We would need our conversions to find the amount of moles of Li needed to produces 6 mol LiCl.
[tex]6molLiCl*\frac{2molLi}{2molLiCl} =6molLi[/tex]
What is a neutralisation reaction? Give two examples.
Explanation:
A neutralization is a type of double replacement reaction. a salt is the product of an acid-base reaction and is a much broader term then common table salt.
Example:-
(i) HCl + NaOH ---> NaCl + HOH
(ii) H2SO4 + 2NH4OH ---> (NH4)2SO4 + 2HOH.
A neutralization reaction is a type of reaction where the water and the salt are produced from the reaction of the base and the acid, and two examples are the hydrochloric acid and sodium hydroxide combination and the reaction of nitric acid and calcium hydroxide.
What is the significance of the neutralization reaction?It is significant because it is very useful in the determination of the concentration of an acid or base in a solution and is also important in industrial applications and biological processes, such as the production of fertilizers and the digestion of food in the stomach.
Hence, a neutralization reaction is a type of reaction where the water and the salt are produced from the reaction of the base and the acid, and two examples are the hydrochloric acid and sodium hydroxide combination and the reaction of nitric acid and calcium hydroxide.
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A 13.5g sample of gold is heated, then placed in a calorimeter containing 60g of water. The temperature of water increases from 19oC to 20oC. The specific heat of gold is 0.13J/goC. What was the initial temperature of the gold metal sample?
Answer:
[tex]T_i~=163.1[/tex] ºC
Explanation:
We have to start with the variables of the problem:
Mass of water = 60 g
Mass of gold = 13.5 g
Initial temperature of water= 19 ºC
Final temperature of water= 20 ºC
Initial temperature of gold= Unknow
Final temperature of gold= 20 ºC
Specific heat of gold = 0.13J/gºC
Specific heat of water = 4.186 J/g°C
Now if we remember the heat equation:
[tex]Q_H_2_O=m_H_2_O*Cp_H_2_O*deltaT[/tex]
[tex]Q_A_u=m_A_u*Cp_A_u*deltaT[/tex]
We can relate these equations if we take into account that all heat of gold is transfer to the water, so:
[tex]m_H_2_O*Cp_H_2_O*deltaT=~-~m_A_u*Cp_A_u*deltaT[/tex]
Now we can put the values into the equation:
[tex]60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C=-(13.5~g*0.13~J/g{\circ}C*(20-T_i)~{\circ}C)[/tex]
Now we can solve for the initial temperature of gold, so:
[tex]T_i~=(\frac{60~g*4.186~J/g{\circ}C*(20-19)~{\circ}C}{13.5~g*0.13~J/g{\circ}C})+20[/tex]
[tex]T_i~=163.1[/tex] ºC
I hope it helps!
Taking into account the definition of calorimetry, the initial temperature of the gold metal sample is 163.36 °C.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
For gold:Mass of gold = 13.5 gInitial temperature of gold= Unknown Final temperature of gold= 20 ºC Specific heat of gold = 0.13 [tex]\frac{J}{gC}[/tex]For water:Mass of water = 60 g Initial temperature of water= 19 ºC Final temperature of water= 20 ºC Specific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgold= 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgold = + Qwater
- 0.13 [tex]\frac{J}{gC}[/tex]× 13.5 g× (20 C - Initial temperature of gold)= 4.186 [tex]\frac{J}{gC}[/tex]× 60 g× (20 C - 19 C)
Solving:
- 1.755 [tex]\frac{J}{C}[/tex]× (20 C - Initial temperature of gold)= 251.16 J
- 1.755 [tex]\frac{J}{C}[/tex]× 20 C - (- 1.755 [tex]\frac{J}{C}[/tex])× Initial temperature of gold= 251.16 J
- 35.1 J +1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold= 251.16 J + 35.1 J
1.755 [tex]\frac{J}{C}[/tex]× Initial temperature of gold=286.7 J
Initial temperature of gold=286.7 J÷ 1.755 [tex]\frac{J}{C}[/tex]
Initial temperature of gold= 163.36 °C
Finally, the initial temperature of the gold metal sample is 163.36 °C.
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Answer:
Explanation:
The Kudzu is a plant that was introduced to the United States from Japan in the year 1876. In the United States it was introduced as an ornamental plant but with a reason which was to prevent soil erosion. Kudzu was disseminated as being high-protein content used to steer feed as well as a spreading plant to counteract soil erosion.
Answer:
Kudzu was introduced as an ornamental plant.
+
Kudzu was introduced as a way of preventing soil erosion.
So, A and D!