“True or False”
Unsaturated solution contains the maximum amount of solute dissolved by a given amount of solvent
ANSWER- True
EPLANATION
CH(4)+ 20(2)→ CO2+ 2H(2)O
22.
The reaction shown above is an example of a -
a. synthesis reaction
b. combustion reaction
c. decomposition reaction
d. double displacement reaction
Answer:
Reaction is a Combustion reaction
When two continental plates of similar
densities collide,
A. they remain level since densities in both plates are equal.
B. they both push back down into the mantle
C. one plate rides over the other one and forms a trench
D.they buckle upward and form mountains
Answer:
D. They buckle upward and form mountains.
Explanation:
When two plates (either oceanic or terrestrial) converge and they are of similar density then they will crash into each other and form mountains. A great example of this is when India crashed into the Asian continent and the Himalayas were formed.
SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
What is the relative placement of the Moon, Earth, and Sun during a lunar eclipse?
1.The Sun, Earth, and Moon are aligned with the Earth in the middle and the Moon furthest away from the Sun.
2.The Earth and Sun are aligned with the Moon at a right angle to Earth.
3The Moon and Sun are aligned with the Earth at right a right angle to the Moon.
4The Sun, Earth, and Moon are aligned with the Moon in the center and the Earth furthest away from the Sun.
Answer:
have a good day
Explanation:
1.The Sun, Earth, and Moon are aligned with the Earth in the middle and the Moon furthest away from the Sun.
A local plant nursery uses large sprinklers to water the plants twice a day. The water contains phosphorus, which is a fertilizer that helps plants grow. Some of the water becomes runoff and ends up in nearby streams and lakes. This is an example of which type of short-term human-induced environmental change? eutrophication
Answer:
It’s eutrophication
Explanation:
There is no way it can be DEFORESTATION or NON SUSTAINABLE SPECIES
Non sustainable harvesting has something to do with animals and eutrophication means adding excessive nutrients
Answer:A.
Explanation: I took the test, sorry if this is incorrect
What math is used to find density?
Answer:
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Density is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter).
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i need to know what occupied vs full means for chemistry
Whic statements explain why rocks weather at different rates? Check all that apply
Explanation:
Weathering occurs one of three ways: through physical processes such as freezing and thawing, because of live organisms whose roots break rocks or through chemical processes that occur when carbon dioxide in the soil and air and mixes with water and specific minerals in rocks to form a weak acid that reduces rocks into silt, soil and sediment.
Chemical weathering typically increases as temperatures rise and rain falls, which means rocks in hot and wet climates experience faster rates of chemical weathering than do rocks in cold, dry climates.
Read all above and you may just find your answer!what are the three things transported by global ocean circulation?
Answer:
The produce large circular currents in all the ocean basins. Currents, The North Equatorial Current, the Gulf Stream, the North Atlantic Current, and the Canary Current.
Explanation:
Aluminum nitrate reacts with sodium hydroxide to form a precipitate of aluminum hydroxide. What mass of aluminum hydroxide will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide?
Answer:
The mass of aluminum hydroxide that will precipitate when 35.5 mL of 0.145 mol/L aqueous aluminum nitrate is mixed with 44.2 mL of 0.215 mol/L aqueous sodium hydroxide is approximately 0.247 grams
Explanation:
The given parameters are;
The volume of 0.145 mol/L aqueous aluminum nitrate in the reaction = 35.5 mL
The volume of 0.215 mol/L aqueous sodium hydroxide in the reaction = 44.2 mL
The balanced chemical equation for the reaction is given as follows;
Al(NO₃)₃ (aq) + 3NaOH (aq) → Al(OH)₃ (s) + 3NaNO₃ (aq)
Therefore;
1 mole of Al(NO₃)₃, reacts with 3 moles of NaOH to form 1 mole Al(OH)₃, and 3 moles of NaNO₃
The number of moles of aqueous aluminum nitrate in the reaction = 35.5/1000 L × 0.145 mol/L = 0.0051475 moles
The number of moles of aqueous sodium hydroxide in the reaction = 44.2/1000 L × 0.215 mol/L = 0.009503 moles
Therefore, 0.009503 moles NaOH will react with 0.009503/3 moles Al(NO₃)₃ to form 0.009503/3 moles of aluminum hydroxide precipitate
The molar mass of aluminum hydroxide = 78 g/mol
Therefore, 0.009503/3 moles of aluminum hydroxide weighs 78 × 0.009503/3 = 0.247078 grams
The mass of aluminum hydroxide that will precipitate out ≈ 0.247 grams.
You are eating dinner with your familiy one night. Your little brother (Who is a disgusting monster ) asked if you likes "seafood?" When you said yes, He proceeded to show you his chewed up, or "See Food". Did a chemical reaction take place, yes or no? What evidence or lack of evidence do you have to support your answer?
Answer:
yes eating the food involves both physical and chemical changes. The chewing of food is a physical change, while the mixing of saliva with food triggers chemical reactions
Explanation:
Once the food mixes with the saliva in our mouth, chemical reactions start taking place in the food, leading to its breakdown and changes in its chemical composition. An evidence of the chemical changes is the taste that we feel when we eat something sweet or sour etc.
Answer:
a chechimal
Explanation:
Which property or properties can change when the pressure of a gas changes?
Answer: This law states that the volume and temperature of a gas have a direct relationship: As temperature increases, volume increases, when pressure is held constant. Heating a gas increases the kinetic energy of the particles, causing the gas to expand
Explanation:
According to this law, a gas's volume and temperature are directly correlated: When pressure is held constant, volume rises as temperature rises. The kinetic energy of the particles in a gas increases when it is heated, which causes the gas to expand.
What rules apply to gases?According to Boyle's Law, when the temperature and mass are both constant, the volume of a given volume of gas sustained at a constant temperature varies inversely with the applied pressure.
The quantity of gas particles, the volume of the container, and the temperature of the gas all affect the pressure of a gas that is confined. The pressure will rise as the amount of gas particles in a container increases. The pressure will rise as a container's volume increases.
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The Guarantee Clause gives the legislature the power to make all necessary and proper laws.
Answer:
True
Explanation:
Answer:
True ;)
Explanation:
What is the molecule that formed between B and F?
Answer:
Hydrogen bond strengths range from 4 kJ to 50 kJ per mole of hydrogen bonds. In molecules containing N-H, O-H or F-H bonds, the large difference in electronegativity between the H atom and the N, O or F atom leads to a highly polar covalent bond (i.e., a bond dipole).
Explanation:
are particles in gas close together
Answer:
Solid particles are close together not gas particles
When using a light microscope, focus the specimen with the scanning objective
lens first.
Reasoning:
Answer:
The light microscope bends a beam of light at the specimen using a series of lenses to provide a clear image of the specimen to the observer.
Order the following elements from Highest to Lowest Electronegativity.
K, Sc, Ca, Zn, Br
Sc, K, Br, Zn, Ca
OK, Ca, Sc, Zn, Br
O Br, Zn, Sc, Ca, K
Ca, Zn, Br, K, SC
Answer:
O, Ca, Zn, Br
Sc, K, Br,
Explanation:
The correct order of the chemical elements from highest to lowest electronegativity is: C. Br, Zn, Sc, Ca, K.
Electronegativity refers to a measure of the ability of an atom of a chemical element to attract any shared pair of electrons.
Generally, the electronegativity of a chemical element typically increases across the period from left to right.
In Chemistry, the electronegativity of some of the chemical element are:
Bromine (Br) = 2.96Calcium (Ca) = 1.0Zinc (Zn) = 1.65Potassium (k) = 0.82Scandium (Sc) = 1.36Hence, the order of the chemical elements from highest to lowest electronegativity is:
1. Bromine (Br) = 2.96
2. Zinc (Zn) = 1.65
3. Scandium (Sc) = 1.36
4. Calcium (Ca) = 1.0
5. Potassium (k) = 0.82
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pls help question 2 ill attach a picture
Answer:
X 154
Check solution in explanation
Explanation:
Average atomic mass = ( mass 1× abudance) + ( mass 2× abudance)+ ( mass 3× abudance) / 100
(149×13.8)+(152×44.9) +(154×41.3)/100
2056.2 + 6824.8 + 6360.2/100
=152.412
EMERGENCY!!! Can someone tell me the answer plz plz I’ll give you brainlist and points plz This is my final test No wrong answers
Answer:
A. the valence electrons
Explanation:
Answer:
The valence electrons
Explanation:
The valence electrons determine an element's properties because chemical properties of each element are determined by the element's electronic configuration and PARTICULARLY by its outermost valence electrons. I hope it helps!
~Good luck
What is this called? it might be sideways but it show look like a Y
Answer:
I'm thinking it might be Element 39: Yttrium, as this is Chemistry.
Explanation:
Is honors high school chemistry hard? Is it hard mathematically? please answer ASAP i have to put in my courses for next year.
Explanation:
yes its hard if you don't pay attention.
Yes, the math is harder but chemistry is not it's really fun the math does get harder tho.
Which of the following is NOT n intensive property?
A. Magnetism
B. Boiling point
C. Thermal conductivity
D. Volume
3. What is the energy of a photon whose frequency is 5.2 x 1015 Hz? Use the equation: E = hxv
h= 6.626 10-34 J xs
4. What is the frequency of radiation whose wavelength is 2.40 x 105 cm? v=c+X
C= 3 x 108m/s
Answer:
3. 3.45×10¯¹⁸ J.
4. 1.25×10¹⁵ Hz.
Explanation:
3. Determination of the energy of the photon.
Frequency (v) = 5.2×10¹⁵ Hz
Planck's constant (h) = 6.626×10¯³⁴ Js
Energy (E) =?
The energy of the photon can be obtained by using the following formula:
E = hv
E = 6.626×10¯³⁴ × 5.2×10¹⁵
E = 3.45×10¯¹⁸ J
Thus, the energy of the photon is 3.45×10¯¹⁸ J
4. Determination of the frequency of the radiation.
Wavelength (λ) = 2.4×10¯⁵ cm
Velocity (c) = 3×10⁸ m/s
Frequency (v) =?
Next, we shall convert 2.4×10¯⁵ cm to metre (m). This can be obtained as follow:
100 cm = 1 m
Therefore,
2.4×10¯⁵ cm = 2.4×10¯⁵ cm × 1 m /100 cm
2.4×10¯⁵ cm = 2.4×10¯⁷ m
Thus, 2.4×10¯⁵ cm is equivalent to 2.4×10¯⁷ m
Finally, we shall determine the frequency of the radiation by using the following formula as illustrated below:
Wavelength (λ) = 2.4×10¯⁷ m
Velocity (c) = 3×10⁸ m/s
Frequency (v) =?
v = c / λ
v = 3×10⁸ / 2.4×10¯⁷
v = 1.25×10¹⁵ Hz
Thus, the frequency of the radiation is 1.25×10¹⁵ Hz.
Two substances in a mixture differ in density and particle size. theses properties can be used to
Answer:
option 1. Two substances in a mixture differ in density and particle size. These properties can be used to separate the substances. These properties can be manipulated in order to have a better separation between the two substances.
Explanation:
Answer:
Two substances in a mixture differ in density and particle size. These properties can be used to separate both of them using the separating funnel or using filtration (filter paper).
Explanation:
Since their densities are different, one substance should float above the other in the mixture which allows for the separating funnel to let the substance sinking below (with the heavier density) to flow out first before changing the beaker to let the lighter substance flow out.
The substance with a bigger particle size would not be able to pass through the filter paper unlike the substance with the smaller particle size as the filter paper's pores is not big enough for it to pass through, separating both substances (with one on the paper and the other outside the filter paper, preferably in the beaker placed below the paper).
Which of the following redox conditions will produce a spontaneous reaction?
A. The sum of the voltages of the half-reactions is positive.
O B. The sum of the voltages of the half-reactions is negative.
O C. The voltage of the reduction half-reaction is positive.
D. The voltage of the reduction half-reaction is negative.
Answer:
A. The sum of the voltages of the half-reactions is positive.
Explanation:
correct on a p e x
Among the following redox conditions those will produce a spontaneous reaction is The sum of the voltages of the half-reactions is positive.
What are redox reactions?Redox reactions are the reactions in which reduction reaction and oxidation reaction happens simultaneously. The term ‘redox’ is a short form of reduction-oxidation. All the redox reactions can be broken down into two different processes: a reduction process and an oxidation process.
The loss of electrons and the corresponding increase in the oxidation state of a given reactant is called oxidation. The gain of electrons and the corresponding decrease in the oxidation state of a reactant is called reduction.
For example-
H₂ + F₂ → 2HF
Hydrogen is added to Fluorine gas so Fluorine has been reduced but Hydrogen has been oxidised.
Therefore, Among the following redox conditions those will produce a spontaneous reaction is The sum of the voltages of the half-reactions is positive.
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The tail in figure A and the rings in figure C are held together by a similar force. What force holds the tail and the rings together?
Answer:
It has to be weak vander waal's forces of attraction.
Answer:
The tail and the rings are held together by the force of gravity.
A student heats a 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) = CaO(s) + CO2(g)
Select one:
a. 1.4 g CaO
b. 2.1 g CaO
c. 2.5 g CaO
d. 1.0 g CaO
Answer:
1.4 g CaO
Explanation:
Given data:
Mass of calcium carbonate = 2.5 g
Mass of Cao remain in tube = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaO:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 100 g/mol
Number of moles = 0.025 mol
now we will compare the moles of CaO with CaCO₃.
CaCO₃ : CaO
1 : 1
0.025 : 0.025
Mass of CaO:
Mass = number of moles × molar mass
Mass = 0.025 mol × 56 g/mol
Mass = 1.4 g
Answer:
1.4g CaO
Explanation:
Did the exam and got it right. Hope this helps
What is the minimum number of kiloJoules needed to change 40.0 grams of water at 100C to steam at the same temperature and pressure
Answer:
90.4Kg
Explanation:
The energy required= latent heat of vaporization
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4Kg
Answer: The minimum number of kilo Joules needed is 90.4KJ.
Explanation:
The energy required= latent heat of vaporization.
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4KJ.
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2. How many liters of propane gas (C3H8) will undergo complete combustion with 34.0 L of oxygen gas? ___ C3H8 (g) + ___ O2 (g → ___ CO2 (g + ___ H2O(g
Answer:
6.8 liters of propane gas will undergo a complete combustion with 34.0 L of oxygen gas.
Explanation:
Given;
combustion reaction of propane and oxygen;
C₃H₈ + O₂(g) → CO₂(g) + H₂O(g)
Balance the chemical reaction as follows;
C₃H₈ + 5O₂(g) → 3CO₂(g) + 4H₂O(g)
From the balanced equation;
1 mole of C₃H₈ ---------------- 5 moles of 5O₂(g)
x Liters of C₃H₈ ----------------- 34.0 Liters of O₂(g)
x = 34 liters / 5
x = 6.8 liters
Therefore, 6.8 liters of propane gas will undergo a complete combustion with 34.0 L of oxygen gas.