Answer:
hiiiiiiiiiiiiiiiiiiiiiiiii THANK YOU SO MUCH FOR THE POINT
t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline.
a. True
b. False
Answer:
True
Explanation:
The correct option is - True
6.An ice cube that has a mass of 20 g is in a sealed container. As the container is heated, the ice first melts, but eventually it changes to water vapor.
A)The temperature at which the ice melts is ____________________.
B) Compare the motion of the particles in each state
Answer:
See explanation
Explanation:
a) Every substance melts at a particular temperature known as the melting point of the substance. The melting point of ice is 0°C. Hence ice melts at 0°C.
b) There are three states of matter; solid liquid and gas. The particles of matter in each stage of matter possess varying degrees of freedom.
In the solid state, the intermolecular forces between the particles of water that compose ice are very strong. Hence the particles do not translate, they only vibrate or rotate about their mean positions.
In the liquid state, the magnitude of intermolecular interaction is less than that of the solids hence the molecules can translate but not with a high kinetic energy.
In the gaseous state, there is a minimum intermolecular interaction between particles theoretically hence the particles are really free to move about with a very high kinetic energy.
Organelles that use energy from sunlight to produce food are called mitochondria
O True
O False
Answer:
Organelles that use energy from sunlight to produce food are called mitochondria.
False
How many moles of O2 are dissolved n 10.0 L of a 0.001 mol dm-3 solution?
Answer:
[tex]0.01molO_2[/tex]
Explanation:
Hello there!
In this case, by considering the definition of molar solution as the moles of solute over volume in liters or cubic meters of solution, we can see that actually 10.0 L of the solution are equal to 10.0 dm³. In such a way, since the concentration is 0.001 mol / dm³, the moles of oxygen that are dissolved turn out to be:
[tex]0.001mol/dm^3 * 10.0dm^3\\\\0.01molO_2[/tex]
Best regards!
PLS HELP
True or false?
If a negatively charged particle is attracted to a second particle, the second particle must have a negative charge
Answer:
False
Explanation:
Negatively charged particles repel other negatively charged particles. Typically a negatively charged particle is electropositive and wants a positive molecule and/or cation (positive ion) to form a bond with. Negative molecules want positive molecules and vise versa.
KBr(aq) + NaCl(aq) =
Equation: CH4 + 202 CO2 + 2H20
What is the mole ratio between oxygen and methane (CH4)? If you use 15 moles of 02, how many grams of methane would you predict would be needed?
Answer:
2:1
1.2 × 10² g
Explanation:
Step 1: Write the balanced combustion equation
CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of O₂ to CH₄ is 2:1.
Step 3: Calculate the moles of CH₄ required to react with 15 moles of O₂
We will use the previously established molar ratio.
15 mol O₂ 1 mol CH₄/2 mol O₂ = 7.5 mol CH₄
Step 4: Calculate the mass corresponding to 7.5 moles of CH₄
The molar mass of CH₄ is 16.04 g/mol.
7.5 mol × 16.04 g/mol = 1.2 × 10² g
Which one of the following statements concerning the length of carbon-carbon single, double, and triple covalent bonds is true?
A. The carbon-carbon single bond is shorter than either the carbon-carbon double or triple bond.
B. The carbon-carbon double bond is shorter than either the carbon-carbon single or triple bond.
C. The carbon-carbon triple bond is shorter than either the carbon-carbon single or double bond.
D. The carbon-carbon single, double, and triple bonds all have the same length.
Answer:
[tex]\color{Blue}\huge\boxed{Question} [/tex]
Which one of the following statements concerning the length of carbon-carbon single, double, and triple covalent bonds is true?[tex]\color{Blue}\huge\boxed{Answer} [/tex]
D. The carbon-carbon single, double, and triple bonds all have the same length.The statement concerning the length of carbon-carbon single, double, and triple covalent bonds which is true is: D. The carbon-carbon single, double, and triple bonds all have the same length.
A chemical bond can be defined as the forces of attraction between ions, crystals, atoms or molecules which are typically responsible for the formation of chemical compounds. Thus, a chemical bond is a force that holds atom together and binds crystals, ions or molecules together, so as to form a chemical compound.
Generally, there are three (3) main types of chemical bonds and these includes:
Hydrogen bonds.Ionic bonds.Covalent bonds.A covalent bond can be defined as a type of bond that typically involves the sharing of electrons between the atoms of a chemical element. The type of bond formed between two or more carbon atoms is a covalent bond. Hence, carbon atoms can either form a single, double, or triple covalent bonds with the same length.
In conclusion, the length of carbon-carbon single, double, and triple covalent bonds are all the same.
Read more: https://brainly.com/question/24212500
Encountering problems during separation/purification is a very common issue in organic synthesis, but these steps are crucial to isolate your desired product.
a. True
b. False
There are three types
of atoms, which on gains and looses electrons?
Answer:
https://courses.lumenlearning.com/boundless-biology/chapter/atoms-isotopes-ions-and-molecules/
Explanation:
1.2 What type of bonding occurs when hydrogen form a diatomic molecule?
Answer:
I think it is covalent bonding...
Explanation:
The bonding is covalent in homonuclear diatomic molecules. Each atom in the molecule has the same electronegativity, which means electrons are shared equally between the two. The electronegativity of the atoms in heteronuclear diatomic molecules varies, and these molecules have polar covalent bonds. A dipole is formed when a molecule interacts with another molecule. (i think it's covalent bonding but i might be wrong)
hope this helps...
For each of the following precipitation reactions, complete and balance the equation, indicating clearly which product is the precipitate.
a) Ba(NO3)2(aq) + (NH4)2SO4(aq)
b)CoCl3(aq) + NaOH(aq)
c)FeCl3(aq) + (NH4)2SS(aq)
Answer:
a) Ba(NO₃)₂(aq) + (NH₄)₂SO₄(aq) ⇒ 2 NH₄NO₃(aq) + BaSO₄(s)
b) CoCl₃(aq) + 3 NaOH(aq) ⇒ 3 NaCl(aq) + Co(OH)₃(s)
c) 2 FeCl₃(aq) + 3 (NH₄)₂S(aq) ⇒ 6 NH₄Cl(aq) + Fe₂S₃(s)
Explanation:
We have 3 double displacement reactions, in which both reactants exchange their cations and anions, and an insoluble compound is formed and precipitates as a solid. This is indicated as (s).
a) Ba(NO₃)₂(aq) + (NH₄)₂SO₄(aq) ⇒ 2 NH₄NO₃(aq) + BaSO₄(s)
b) CoCl₃(aq) + 3 NaOH(aq) ⇒ 3 NaCl(aq) + Co(OH)₃(s)
c) 2 FeCl₃(aq) + 3 (NH₄)₂S(aq) ⇒ 6 NH₄Cl(aq) + Fe₂S₃(s)
how many electrons do nonmetals atoms tend to gain when forming ions
make a chart to show the effect of Sodium Hydroxide and Sulphuric acid on methyl orange and red litmus paper
Answer:
mark me as brainliest plsss
Hence in the Sodium hydroxide, methyl orange will turn into yellow color and in Sulfuric acid shows red color. Red litmus will turn into blue color in the Sodium hydroxide solution.
What is litmus paper?Litmus paper is a paper which is used to identify the acidity or basicity of any solution.
Sulfuric acid is acidic in nature, and red litmus paper shows no effect in this acid as red paper change into blue in the presence of base. Methyl orange is an indicator and it shows red color in the acidic medium.Sodium hydroxide is basic in nature and red litmus paper will change into blue in this solution and color of methyl orange changes from red to yellow in the basic solution.Hence, the effect of red litmus & methyl orange is explained above.
To know more about litmus paper, visit the below link:
https://brainly.com/question/1287856
4.4 mol nitrogen.
VN2 = ____L
Answer:
99 L
Explanation:
Step 1: Given data
Moles of nitrogen: 4.4 moles
Step 2: Calculate the volume occupied by 4.4 moles of nitrogen
The volume occupied by a gas depends on other conditions such as pressure (P) and temperature (T). If we have this information, we can calculate the volume of the gas using the ideal gas condition.
P × V = n × R × T
Since the task doesn't inform the conditions, we can assume it is under standard pressure (1 atm) and temperature (273.15 K). At STP, 1 mole of any gas occupies 22.4 L.
4.4 mol × 22.4 L/1 mol = 99 L
Where is chemical energy contained in a compound?
A. in the movement of the electrons
B. in the nuclei
C. in the bonds
D. in unbonded electrons
Answer:
C
Explanation:
Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called exothermic.
Answer:
The Answer is C.
Explanation:
Cause I'm smart
Single-use earplugs require a professlonal fitting before they can be used.
A) True
B) False
Answer:
The answer is false
Explanation:
Because i am taking this safety test and i got that question right ong
Which of these things would you expect to have cells with both mitochondria
and chloroplasts?
A. Squirrel
B. Shark
C. Hummingbird
D. Grass
Answer:
D. Grass
Explanation:
Every living organism must contain one or more cells to be considered "living". Each cell, however, contains certain structures that perform specific roles called ORGANELLES. These organelles are of different types and hence, perform different tasks. For example, mitochondria is the power house of a cell i.e. site of energy production, and hence, is found in every eukaryotic cell.
On the other hand, chloroplast is an organelle designed to perform photosynthesis, which only occurs in plant cells. Since only plant cells can undergo photosynthesis, only plant cells can contain chloroplast. Hence, according to this question, GRASS as a type of plant is an organism that will contain both mitochondria and chloroplast in its cells.
Do you think baking a cake is or is not a chemical reaction
Answer:
yes
Explanation:
its an endothermic chemical reaction
Answer:
It is a chemical reaction because you cannot get back the original ingredients. if you can get the original ingredients back, it would be a physical change.
Hope this helped you out!!
Which process created the gases of earth’s first atmosphere?
a.volcanic activity
b.weathering
c.photosynthesis
d.photolysis
Answer:
Volcanic Activity
Explanation:
Answer: A) Volcanic Activity
Rock formations are sculpted into shape by two general forces. What are these?
a.photosynthesis and volcanism
b.weathering and erosion
c.volcanism and weathering
d.uplift and rainfall
Answer:weathering and erosion
Please mark brainlyest
Explanation:
Answer:
b.weathering and erosion
Explanation:
Weathering and erosion shape rock formations.
3. The graph below shows the temperature changes occurring in two hot packs that are made from different materials. The same amounts of water and CaCl2 were used to make each pack. Which of the following inferences is supported by the graph?
Answer:
LDPE would be the best choice for a hand warmer designed to release heat quickly.
Explanation:
Judging from the graph, the LDPE plastic releases heat quicker than the Latex. (and I also did the gizmo-)
Temperature is a property of matter that represents the amount of energy expended in the motion of the constituent particles.
What is matter?Matter is any substance that has mass and takes up space by having volume.
What is energy?The potential to work would be defined as energy.
What is motion?
The definition of motion is still the change in the position and orientation of the body over time.
As a result, the highest temperature of latex is approximately 530°C, while the temperature of LDPE plastic becomes 58°C in the graph above. After 60 minutes, the LDPE plastic will emit less energy toward its surroundings than latex. Latex reaches its highest temperature faster than LDPE plastic.
To learn more about energy and motion click here
https://brainly.com/question/2748259.
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A student ran the following reaction in the laboratory at 1100 K: 2SO2(g) O2(g) 2SO3(g) When he introduced SO2(g) and O2(g) into a 1.00 L evacuated container, so that the initial partial pressure of SO2 was 3.43 atm and the initial partial pressure of O2 was 1.61 atm, he found that the equilibrium partial pressure of O2 was 0.809 atm. Calculate the equilibrium constant, Kp, she obtained for this reaction.
Answer:
Kp = 0.949
Explanation:
Hello there!
In this case, according to the given chemical reaction:
[tex]2SO_2(g) +O_2(g) \rightleftharpoons 2SO_3(g)[/tex]
It is possible to set up the equilibrium expression as shown below:
[tex]Kp=\frac{p_{SO_3}^2}{p_{SO_2}^2p_{O_2}}[/tex]
Whereas the initial pressure of SO2 was 3.43 atm and that of O2 was 1.61 atm. Now, since the partial pressure of O2 decreased to the 0.809 atm, it is possible to calculate the change in the pressure of O2 via:
[tex]x=1.61atm-0.809atm=0.801atm[/tex]
Which is actually applied to SO3 and SO2 according to the stoichiometry in the equilibrium expression to calculate Kp:
[tex]Kp=\frac{(2*x)^2}{(3.43-2x)^2(0.809)}[/tex]
Thus, by plugging in x, we obtain:
[tex]Kp=\frac{(2*0.801)^2}{(3.43-2*0.801)^2(0.809)}\\\\Kp=0.949[/tex]
Best regards!
In the front of the room, there is a bottle that contains a 32.00 g sample of sulfur. This is
1 mole of sulfur. Estimate how many atoms are in the bottle.
Does all of the liquid water in the atmosphere fall as rain? Why or why not?
A chemist fills a reaction vessel with 0.247 M lead(II) (Pb2+) aqueous solution, 0.758 M bromide (Br-) aqueous solution, and 0.109 g lead (II) bromide (PbBr2) solid at a temperature of 20.0 oC. Under these conditions, calculate the reaction free energy deltaG for the following chemical reaction:
Pb2+(aq) + 2Br-(aq) <----> PbBr2(s)
Answer:
ΔG = -24.7kJ/mol
Explanation:
ΔG° of
Pb2+(aq) + 2Br-(aq) ⇄ PbBr2(s)
is:
ΔG° PbBr2 - (2*ΔG°Br- + ΔG°Pb2+)
-261.9kJ/mol - (2*-104.0kJ/mol + -24.4kJ/mol) =
-29.5kJ/mol
ΔG of the reaction is:
ΔG = ΔG° + RT lnQ
Where R is gas constant (8.314x10⁻³kJ/molK)
T is absolute temperature (20°C + 273.15 = 293.15K)
Q is reaction quotient = 1 / [Pb²⁺][Br⁻]²
Replacing:
ΔG = -29.5kJ/mol + 8.314x10⁻³kJ/molK*293.15K ln(1 / [Pb²⁺][Br⁻]²)
ΔG = -29.5kJ/mol + 8.314x10⁻³kJ/molK*293.15K ln(1 / [0.247M][0.758M]²)
ΔG = -24.7kJ/mol
A gas system contains 2.00 moles of O2 and CO2 gas, has an initial temperature of 25.0 oC and is under 1.00 atm of pressure. If the pressure remains constant and the temperature is raised to 45.0 oC, then what will the new volume (assuming a closed system) be?
Answer:
[tex]V_2=52.2L[/tex]
Explanation:
Hello there!
In this case, by bearing to to mind the given conditions, it is firstly possible to determine the initial volume of the closed system via the ideal gas equation:
[tex]PV=nRT\\\\V=\frac{2.00mol*0.08206\frac{atm*L}{mol*K}*298.15K}{1.00 atm} \\\\V=48.9L[/tex]
Which is V1 in the Charles' law:
[tex]\frac{T_2}{V_2} =\frac{T_1}{V_1}[/tex]
And of course, T1 is 298.15 (25+273.15). Therefore, by solving for V2 as the final volume, we obtain:
[tex]V_2=\frac{V_1T_2}{T_1}\\\\V_2=\frac{48.9L*(45+273.15)K}{(25+273.15)K} \\\\V_2=52.2L[/tex]
Best regards!
2. Why can we eliminate the claim you circled?
Answer: theres no image or claim
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 1.5 g of hydrochloric acid is mixed with 2.67 g of sodium hydroxide. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your answer to significant digits.
Answer: The maximum amount of water that can be produced is 0.74 g
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Putting values in equation 1, we get:
[tex]\text{Moles of hydrochloric acid:}=\frac{1.5g}{36.5g/mol}=0.041mol[/tex]
[tex]\text{Moles of sodium hydroxide}=\frac{2.67g}{40g/mol}=0.067mol[/tex]
The chemical equation for the reaction is
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
By Stoichiometry of the reaction:
1 mole of HCl reacts with 1 mole of NaOH
So, 0.041 moles of HCl will react with = [tex]\frac{1}{1}\times 0.041=0.041mol[/tex] of NaOH
As, given amount of NaOH is more than the required amount. So, it is considered as an excess reagent. Thus, HCl is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of HCl produces = 1 mole of water
So, 0.041 moles of HCl will produce = [tex]\frac{1}{1}\times 0.041=0.041moles[/tex] of water
Mass of water=[tex]moles\times {\text{Molar Mass}}=0.041mol\times 18g/mol=0.74g[/tex]
Thus the maximum amount of water that can be produced is 0.74 g
A study was created to test the effects of fear in children. The hypothesis of the experimenters was that if babies were exposed to fuzzy bunnies and at the same time a loud cymbal was struck close behind them, then that child would be afraid of all fuzzy things. Another group of children would be exposed to bunnies without any loud noises. The study was carried out as planned and as a result, hundreds of young children developed fear of all cute furry bunny rabbits.
Dependent Variable: ______________________
Control Group: ____________________________
Independent Variable: _____________________
Experimental Group: _______________________
Answer:
Dependent variable: the children's fear of rabbits
Control: the group that was NOT exposed to loud noises
Independent variable: the loud noises
Experimental Group: the group that was exposed to loud noises
