Answer: Genetically modified plants may harm organisms that were never indented to be harmed.
Gay-Lussac's Law explains how the temperature of a gas is related to its' .
Answer:
volume
Explanation:
What does the molecular structure of Y show?
Answer:
the molecular structure of y shows that it is solid
Explanation:
because in solid state atoms are tightly packed and they are attached to them closely
Through which of the following room-temperature substances would sound travel the slowest? a water b rubbing alcohol c oxygen d glass
Answer:
id say oxigan
Explanation:
i dont realy know but if im rong correct me
Answer:
Oxygen
Explanation:
Sound energy vibrates atoms andecause of this phenomenon, sound moves at a higher speed through solids than through liquids. Sound moves at its slowest speeds through gases. molecules of matter as it travels through a medium. The more tightly packed the particles of a medium, the faster sound energy will transfer through it.
when 25 ml of 0.12 m aqueous ammonia is titrated with 0.12 m hydrobromic acid, what is the ph at the equivalence point?
The pH value will be equal to 3.29 at the equivalence point.
What is titration?Titration is the laboratory method that is performed to determine the concentration of the analyte. An indicator is used to know the equivalence point.
Given the concentration of HBr = 0.12 M
The concentration of ammonia = 0.12 M
The value of Kb for ammonia = 1.8 ×10⁻⁵
The chemical reaction is :[tex]NH_3 + HCl \longrightarrow NH^+_4 + Cl^-[/tex]
For the ammonia: NH₃ NH₄⁺ H⁺
Initial conc.: 0.12 M ---- -----
Change: - x + x +x
At equilibrium: 0.12-x x x
The acid dissociation constant :[tex]K_a =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{K_w}{K_b} =\frac{[NH_4][H^+]}{[NH_4^+]}[/tex]
[tex]\frac{1\times 10^{-14}}{1.8\times 10^{-5}} =\frac{(x)(x)}{(0.12-x)}[/tex]
[tex]5.56\times 10^{-10}=\frac{x^2}{0.12-x}[/tex]
x² + 5.56× 10⁻⁵ x- 46.33 × 10⁻¹⁰ = 0
x = 4.57 × 10⁻⁵
The concentration of hydrogen ions = 4.57 × 10⁻⁵
The pH value = - log [H⁺]
pH = -log [4.57 × 10⁻⁵]
pH = 3.29
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The specific heat of solid water (ice) and liquid water are 2.03 J/gºC and 4.18 J/gºC respectively. Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. Calculate the heat of fusion of water in J/g. Assume the melting point of water is 0 °C.
Taking into account the definition of calorimetry, sensible heat and latent heat, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .
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).
Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
In this case:
-25 °C to 0 °CIn firts place, you know that the melting point of water is 0°C. So, first of all you must increase the temperature from -25° C (in solid state) to 0 ° C, in order to supply heat without changing state (sensible heat).
The amount of heat a body receives or transmits is determined by:
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:
c(solid)= 2.03 [tex]\frac{J}{gC}[/tex] m= 49.3 g ΔT= Tfinal - Tinitial= 0 °C - (-25 °C)= 25 °CReplacing:
Q1= 2.03[tex]\frac{J}{gC}[/tex] × 49.3 g× 25 °C
Solving:
Q1=2501.975 J=2.501975 kJ≅ 2.50 kJ
Change of stateThe heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q = m×L
where L is called the latent heat of the substance and depends on the type of phase change.
In this case, you know:
m= 49.3 gΔHfus= ?Replacing:
Q2= 49.3 g× ΔHfus
0 °C to 44.7 °CSimilar to sensible heat previously calculated, you know:
c(liquid)= 4.18 [tex]\frac{J}{gC}[/tex] m= 49.3 g ΔT= Tfinal - Tinitial= 44.7°C - 0°C= 44.7 °CReplacing:
Q3= 4.18[tex]\frac{J}{gC}[/tex] × 49.3 g× 44.7 °C
Solving:
Q3= 9211.5078 J=9.2115078 kJ≅ 9.21 kJ
Total heat requiredThe total heat required is calculated as:
Total heat required= Q1 + Q2 + Q3
Total heat required= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Heating a 49.3 g sample of g ice from -25.0 °C to water at 44.7 °C requires 28.23 kJ of heat. This is, the total heat required is 28.23 kJ. Then:
28.23 kJ= 2.50 kJ + 49.3 g× ΔHfus + 9.21 kJ
Solving:
28.23 kJ= 11.71 kJ + 49.3 g× ΔHfus
28.23 kJ- 11.71 kJ = 49.3 g× ΔHfus
16.52 kJ = 49.3 g× ΔHfus
16.52 kJ ÷ 49.3 g= ΔHfus
0.335091[tex]\frac{kJ}{g}[/tex]= 335.091 [tex]\frac{J}{g}[/tex] =ΔHfus
In summary, the heat of fusion of water is 335.091 [tex]\frac{J}{g}[/tex] .
Learn more:
brainly.com/question/14057615?referrer=searchResults brainly.com/question/24988785?referrer=searchResults brainly.com/question/21315372?referrer=searchResults brainly.com/question/13959344?referrer=searchResults brainly.com/question/14309811?referrer=searchResults brainly.com/question/23578297?referrer=searchResultsSuppose a solid object is fully immersed in a liquid, but B is larger than w. Is this possible at all
This problem is stating a situation in which a solid object is fully immersed in a liquid and the buoyant force is larger that its weight, so that you need to discuss whether this is possible or not.
In general terms, it is necessary to keep in mind that when the buoyant force is larger than its weight, the object will float. On the other side, when the buoyant force is smaller than the weight, then the object will sink.
It means that it could be possible to have this scenario under specific conditions. Now, the Archimedes' principle can be applied with the following version:
[tex]F_B+W>m_{obj}*a\\\\\rho _{fluid}*V*g+m_{obj}*g>m_{obj}*a\\\\\rho _{fluid}*V-m_{obj}>m_{obj}*a[/tex]
It means that the object can move down the liquid if has a significant acceleration (could be external), even when the buoyant force is larger than the weight
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https://brainly.com/question/18103369https://brainly.com/question/14271593True or false Cell division in Prokaryotes that form two genetically identical cells is know as fission.
An atom of zinc that contains 30 protons and 38 neutrons would be named what
Answer:
Explanation:
30+38
so this is the isosotope of Zn that weighs 68
-so Zn68
My atomic mass is 35.453
Answer:
Chlorine Cl atomic # 17, atomic mass 35.453
Explanation:
My atomic mass is 35.453
Dmitri Mendeleev discovered the Periodic Table using atomic mass
look at your periodic table
only ONE element has an atomic mass of 35.453
Chlorine Cl atomic # 17, atomic mass 35.453
The smallest unit of a covalent compound that still retains the properties of the compound is called a(n) Multiple Choice electron. atom. molecule. dipole.
Answer: the answer is molecules
A molecule is the smallest particle of a covalent compound that still has the properties of the compound.
answer asap!!!!!!!!!!!!!!!!!!!!!!!!!!11
Which object would be the BEST to use and why?
A
The radio because it can be powered using batteries or electricity.
B
The clock because the pendulum begins to swing when it has a source of power.
C
The light bulb in a lamp because electricity leads to a chemical reaction in the light bulb.
D
The bottle of soda because the liquid soda heats up when the temperature is increased when it is left in the sun.
Answer:
B
Explanation:
The individual particles in an ionic solid are held together as a result of:
electrostatic force
Explanation:
In ionic bonds one atom is positively charged (the atom that gives its electrons), and the other atom is negatively charged (the atom that receives the electrons); therefore, it is the opposite charge of the ions that attracts them to one another and holds them together with electrostatic force.
a student places iron metal over a flame, and begins to react with oxygen gas in the air. A red, powdery solid begins to form on the iron. What is the name of the red solid?
Answer:
Iron, as well as iron alloys, rusts because of a chemical reaction known as oxidation. When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide
Which statement best describes a physical change?
Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will remain the same.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains the same.
Answer:
The answer should be C.
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same.
Explanation:
Physical changes can occur to a substance without changing the chemical properties.
For example:
If you change your hair color, your personality would not change as well. So you are right, it is C!
Hope this helps!
what type of intermolecular force causes the dissolution of nacl in water?
Answer:
When NaCl is dissolved in water, it dissociates into Na+ and Cl− . These ions can be attracted strongly to the partial negative end and partial positive end of the water molecule.
Explanation:
Hence, the major intermolecular forces that contribute to the dissolution of NaCl in water are ion-dipole forces.
12. Gavin is having a difficult time
moving his sofa across the living
room. He decides to place wheels on the legs of the sofa to make it easier, Which of the following forces is Gavin overcoming?
A Gravity
B Friction
C Buoyant force
D Unbalanced force
Answer:
Friction
Explanation:
the resistance that one surface or object encounters when moving over another.
what is the smallest unit of an element that still has all the properties of that element?
Answer:
An Atom
Explanation:
This is the smallest unit which still has the properties of an element.
In a cell, what is the function of the cell membrane?
A.
It only maintains the cell shape.
B.
It controls the entry and exit of substances.
C.
It generates energy for the cell.
D.
It removes waste and stores ingested food.
Answer:
b it controls the entry and exit of substances
dehydration of tertiary alcohols occurs by what mechanism?
Answer:
An EL mechanism
Explanation:
I looked this up, it's called an EL mechanism
What energy transformation takes place when you turn on an electric light?
Chemical - light + heat
Mechanical - light + heat
Electrical - light + heat
Chemical electrical + heat
Answer:
Electrical- light + heat
Explanation:
By turning on the light Electricity energy takes place which gives us light energy which generates heat
Does the coating from another type of candy dissolve in water like M&M’s ?
Claim
Evidence
Reasoning
The candy coating of the M&M is made of sugar and colored dye. When water comes into contact with the sugary coating, the positive and negative charges in the water molecules pull on the negative and positive charges in the sugary coating, and the coating dissolves.
what products or services are un demand in your community
CBD oils and products (profitable products) ...
Eco-friendly products (top trending products) ...
Natural skincare and cosmetics (popular beauty products) ...
Specialty teas (fast-selling items) ...
Diet fad-products (ideal for target audiences)
Rutherford concluded from his calculations that the volume of an atom Multiple Choice is filled with protons, neutrons and electrons. is mostly protons, with electrons revolving around the outside. is filled with electrons. is mostly empty space.
Answer: D is mostly empty space
Explanation: Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. Found this with his gold foil experiment
A gas has a volume of 0.215 L and a temperature of -20.0 oC. The gas is heated to 60.0 oC at constant pressure. What will happen to the volume of the gas
Answer:
V1/T1 = V2/T2
we must convert temperature from °c to kelvin
so T1= -20+273.15=253.15
and T2 = 60 +273.15= 333.15
0.215/253.15= V2/333.15
V2= 0.28L
hence, volume increases a little bit
Use the problem below to answer the question:
34 grams of carbon reacted with an unlimited amount of H20. The reaction is:
C + H2O CO + H2
The atomic mass of C is 12.01 g/mole. The atomic mass of H2 is 2.016 g/mole. Finish the problem by choosing the
correct format for dimensional analysis.
Answer:
34 grams of carbon is approx. 2.833 moles
Explanation:
Group 8A (noble gases) don’t react with other elements because
a
they can have either a positive or a negative charge.
b
their outermost energy level is missing one electron.
c
their outermost energy level is full.
d
they readily form positive ions.
The Bergeron process causes cloud droplets to grow because
A. freezing nuclei are much more common in the atmosphere than other condensation nuclei.
B. water freezes instantly when its temperature reaches 0 degrees
C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.
D. larger drops fall and collect smaller droplets in the cloud.
Answer: C. the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets
The Bergeron process causes cloud droplets to grow because, the saturation vapor pressure is lower near ice crystals than it is near supercooled droplets.
What is Bergeron process ?Physical transformations from a cloud of extremely small droplets to much bigger precipitation-sized particles that fall to the earth require a number of intricate and poorly understood physical processes.
The process of collision and coalescence, in which colliding droplets expand by merging together or coalescing, is how droplets form in warm clouds, those that solely contain liquid water.
Larger droplets pass through tiny droplets more quickly because they descend at a faster rate than the smaller ones. Strong updrafts (rising air currents) can produce cloud raindrops, just like hail, since they let heavier drops to stay suspended in the cloud.
Bergeron's process causes precipitation-sized particles to develop in cool clouds. Hence, option C is correct.
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Question 12 (ID=1798500)
In which state of matter are the molecules spaced farthest apart?
A: A gas
B: A liquid
C: A solid
D: All are equal
Answer:
A gasss
Explanation:
they have enough kinetic energy that the effect of the intermolecular forces is small and they are spaced very apart from each other
In a circus, a 50 kg clown is shot out of a cannon at 20 m/s. What is his momentum?
Answer: 1000 kg * m / s
Explanation:
momentum is equal to mass times velocity!
50 times 20 is
1000
so momentum is 1000 kg * m/s
