Answer:
D, adding a second plant to the test tube
What are the characteristics for mechanical waves
Which of the following does not describe a physical property of iron?
A
Iron is silvery-white or gray in color.
B
Iron has a boiling point of about 3,000°C.
C
Iron is a magnetic element.
D
Iron and sulfur react to form iron sulfide.
Answer:
B
Explanation:
Iron becomes liquid when we heat it to a temperature of 1535° C this is it's melting point. If we further heat the liquid to 3,000° C it boils; iron is a gas above this temperature.
A chemical reaction that has the general formula of AB + C → CB + A is best classified as a
synthesis
polymerization
decomposition
oxidation
replacement
reaction.
Replacement reaction.
Further explanationGiven
A chemical reaction
AB + C → CB + A
Required
reaction type
Solution
There are several types of reactions that can occur
synthesis: 2 elements combine to form a single product
polymerization: monomers combine to produce a polymer
decomposition: One compound breaks down into 2 components
oxidation : a change in oxidation number
replacement can be divided into 2
single replacement if one element replaces the other elements of a compound
double replacement if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds
AB + C → CB + A
If we look at this reaction, element C replaces element A to form a new compound CB. So it is single replacement. But this reaction can also be said to be an oxidation-reduction reaction because there is a change in oxidation number
element A undergoes a reduction reaction
element C undergoes an oxidation reaction
So types of redox reactions can be combination, decomposition, displacement, combustion, and disproportion.
Answer:
oxidation
Explanation:
i passed and got 100%
Can someone help me please!(I will mark you brainliest)
Answer:
ok Look at it and tell me if you think its correct :}
can i have some help :'(
manganese atom has 30 neutrons and atomic number 25
calculate the atomic mass of manganese atom
The atomic mass of manganese atom : 55
Further explanationGiven
Manganese (Mn) atom has 30 neutrons
atomic number 25
Required
the atomic mass
Solution
The atomic mass=number of protons+number of neutrons
The atomic number = number of protons=number of electrons
The number of protons=25, so the atomic mass :
[tex]\tt =ptotons+neutrons\\\\=25+30\\\\=55[/tex]
An apple, potato, and onion all taste the same if you eat them with your nose plugged
true or false
i know the answer do you?
Answer:
Ummm it would just be indistinguishable ..and i don’t think u well taste when u plug your nose so ldk but ig it is true let me know if am wrong
Explanation:
what is the structural formula of propene
Explanation:
Structural formula of propene
H₃C–CH₂=CHmolecular formula = C₃H₆
molecular mass = 12×3+1×6 = 36+6 = 42
no. of double bond = 1
This table shows the pH values of different solutions. A 2-column table with 4 rows. The first column labeled solution has entries W, X, Y, Z. The second column labeled p H has entries 6, 5, 1, 3. Which ranks the solutions from the strongest to weakest acid? W X Y Z Y W X Z W X Z Y Y Z X W
Answer:
D- Y -Z -X -W
:)
The solution with lowest pH are more acidic and those with higher pH values are basic. The given solutions can be ranked from the strongest to weakest acid as Y Z X W.
What is pH?pH of a solution is the measure of its H+ ion concentration. Mathematically it is the negative logarithm of H+ ion concentration of the solution. The acidic solutions contains more H+ ions.
A pH value of 7 represents a neutral solution. The pH above 7 is basic solution and a solution with pH below 7 is acidic in nature. A pH scale can be used to measure the range.
The pH of 1 and 3 indicates strong acidic solutions and 5 and 6 are weakly acidic . The lowest value of pH indicates highest acidity. Therefore, the correct order is Y Z X W.
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Which of the following are common decomposers? (Select all that apply) fungi, ferns, bacteria, viruses, grasses
Answer:
Fungi, bacteria, ferns,
Explanation:
bacteria Fungi Ferns are important. decomposers,
I hope it helps you.
There are basically four different categories of decomposers: fungi, insects, earthworms, and bacteria. Fungi, ferns and bacteria are common decomposers.
What are decomposers ?Decomposers are organisms that disintegrate rotting or dead species; they carry out decomposition, a process only some kingdoms, like fungi, are capable of.
The primary decomposers in nature are fungi, which destroy organic material that would otherwise not be recycled.
Scavengers and decomposers are the two different categories of decomposers. Animals called scavengers hunt down dead plants or animals and consume them. They cut them into small pieces when they eat them.
Each contributes to the food recycling process differently. To transform dead plants or animals into simple substances, fungi release compounds. Some of these elements are absorbed by them for growth, while others go into the soil.
Thus, Fungi, ferns and bacteria are common decomposers.
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conditions for reaction of oxygen and copper
state the observation of the reaction
write the equation
Help pls!
How can you use a chemical reaction to remove a contaminant from a solution?
Answer:
reverse osmosis
Explanation:
Water treatment is often complicated because it deals with the chemical makeup of the water, which varies widely. The first step is to determine what contaminants should be removed. Unfortunately, this is not always a straightforward process. Many contaminants make themselves known in obvious ways, such as iron or hydrogen sulfide, which can cause taste and odor issues. Other contaminants, such as arsenic or pesticides, are only uncovered through a sophisticated laboratory analysis.
It is important to test the water so that the right type of treatment system can be selected. Keep in mind, however, that more than one analysis may be necessary to get a baseline because water quality fluctuates. More information on possible contaminants in a specific area can be obtained by talking to residents, the local health department, the water department, or the state geological society. In addition, your laboratory should be able to recommend appropriate tests based on a customer’s concerns and the information provided about the water source. It is important not only to address customers’ concerns but also to educate them about potential contaminants they may not have considered.
About ______ impact the creators have been recognized on earth.
A) one thousand
B) 50
C)500
D)150
Which of the following methods can be used to completely separate a solution containing alcohol and water?
A) Evaporation and distillation
B) Filtration
C)Floatation or centrifuge
D) Magnetism
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
Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained
Answer:
They each have the same number of protons.
Explanation:
Full question: Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained. What is true about all uranium atoms?Answer:
They each have the same number of protons
Explanation:
All uranium isotopes have 92 protons in their nucleus. However, they differ in the number of neutrons in the nucleus, hence this also translates to varying mass numbers (which is the sum of neutrons and protons in the nucleus). The most common isotopes of uranium are; U-238, U-235, and U-234
How do the physical and chemical properties of wood contribute to the function of the synthetic products made of wood?
Wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature.
What is wood?Wood is one of the most common and useful natural materials. It is the main tissue that supports and conducts nutrients in trees and other plants. Wood comes in a variety of colours & grain patterns and is produced by numerous botanical species, comprising both gymnosperms & angiosperms.
Its wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature. Unfavourable weather and unexpected temperatures will have an impact on the wood's strength. Among its attributes are mechanical, chemical, and physical qualities.
Therefore, wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time.
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why can fluids flow but solids can’t?
Answer:
Fluids can flow because their molecular structure is different. Instead of being tightly packed, like a solid, there are fewer molecules per unit in a liquid than a solid. This gives the molecules of a liquid space to move around, and it flows because liquids take the shape of their container(s). These molecules usually tend to bump into each other and this causes the liquid to move as well
Answer:
Because the particles don't move, solids have a definite shape and volume, and can't flow. LIQUIDS - This means that liquid particles are further apart and can move about more easily. Since the particles can move, the liquid can flow and take the shape of its container.
Explanation:
hope this helps
Elements in group 17 want to lose seven valence electrons and elements in group 1 want to gain seven valence electrons to become stable ions.
If you leave your home at noon, and the speed limit is 50 km/h on the highway, what is the approximate time will you get to Atlantic City if Atlantic City is 150 km away? (obeying the speed limit of course)
Answer:
The time you will get to Atlantic City is 3 pm
Explanation:
Given;
speed limit, v = 50 km/h
distance to be traveled, d = 150km
The time of the motion is given as;
time = distance / speed
t = (150 km) / (50 km/h)
t = 3 hours
Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;
time to get home = 12 pm + 3hours = 3 pm
Therefore, the time you will get to Atlantic City is 3 pm
hi does anyone know what the answer to this is? i really need help
Answer:
The answer is
H. Met, Val, Lys, Arg, Gin, Ser
Explanation:
You are asked to get a compound that has a low melting point and cannot
conduct electricity, which would you pick if you saw three bottles labeled as LICI,
NaBr, and BrF. What type of bond did you get?
Answer:
the third
Explanation:
The chemical formula for the ionic compound aluminum sulfite is Al2(SO3)3. Explain why there are 2 cations for every 3 anions in this compound.
Please help lol
Answer: It is a 2:3 ratio because Al has a +2 charge and S and O both have a -2 charge. It takes 2 Al to bring 3 SO3 to a neutral state.
Explanation:
Convert 6.21 km to m
What happens when you put an ice-pop outside? This is for the people who don’t know
Answer:
It melts
Explanation:
Answer:
It melts?
Explanation:
A student calculates the density of an unknown solid. The mass is 10.04 grams, and the volume is 8.21 cubic centimeters. How many significant figures should appear in the final answer
Answer:
1.22 g/cm³
Explanation:
Density = mass ÷ volume
Mass = 10.04 grams
Volume = 8.21 cubic centimeters
Density = mass ÷ volume
= 10.04 ÷ 8.21
= 1.2228989037758 g/cm³
Approximately
1.22 g/cm³ to 2 significant figure.
The final answer should be approximated to 2 significant figure because the mass and volume of the objective given is in 2 significant figure
What occurs during replication?
O A protein is formed from information in messenger RNA.
A messenger RNA strand is made from DNA.
O A copy of DNA is made from existing DNA.
A copy of DNA is transferred from one organism to another.
Answer:
A
Explanation:
Hopefully this helps
Answer:
A copy of DNA is made from existing DNA.
Explanation:
Just did the quiz
What's the Balance equation for:
_C4H10O +_ O2--->_CO2+_H20
Answer:
C₄H₁₀O + 6O₂ ⇒ 4CO₂ + 5H₂O
Explanation:
Match the amount of reactants and products on both sides of the equation.
how does reducing the temperature of chemical reaction affect the rate at which it occurs?
Answer:
When you lower the temperature, the molecules are slower and collide less. That temperature drop lowers the rate of the reaction. When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions.
Explanation:
would u like to do a zoom?
If u can...
im just bored and my friend fell asleep on me :/
Temperature measures the average kinetic energy of particles of the substances. Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
What is temperature?Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.
Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.
When the temperature is reduced, the molecules move more slowly and collide less. The reaction's pace is slowed as the temperature drops. When the pressure is increased, the molecules have much less area to travel in. The number of collisions rises as the density of molecules increases.
Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
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help with this asap please
ΔH rxn = 434.7 kJ
Further explanationGiven
C+O₂⇒CO₂ ΔH=-393.5 (reaction 1)
2CO+O₂⇒2CO₂ ΔH=-566 (reaction 2)
2H₂O⇒2H₂+O₂ ΔH=483.6 (reaction 3)
Required
ΔH rxn
Solution
Reaction 1 : no change
C+O₂⇒CO₂ ΔH=-393.5
Reaction 2 : the reaction is reversed and divided by 2
CO₂⇒ CO+1/2O₂ ΔH=-283
Reaction 3 : divided by 2
H₂O⇒H₂+1/2O₂ ΔH=241.8
-------------------------------------------
C+H₂O⇒CO + H₂ ΔH rxn= -434.7 kJ
Using principles of atomic structure, explain why the atomic radius of Te is less than the ionic radius of Te2− . Photoelectron spectroscopy data for the 1s sublevel of Te and the 1s sublevel of O are represented below. In terms of Coulomb's law and atomic structure, explain why the peak for O is positioned so far to the right of the peak for Te .
Answer:
See explanation
Explanation:
Let us recall that a negative ion is formed by addition of electrons to an atom. When electrons are added to the atom, greater interelectronic repulsion increases the size of the Te^2− hence it is greater in size than Te atom. Therefore, the ionic radius of Te^2− is greater than the atomic radius of Te.
In the second question, oxygen is positioned so far to the right because it has a far smaller nuclear charge compared to Te. Hence in the PES spectrum, the 1s sublevel of oxygen lies far to the right of that of Te.
Using principles of atomic structure, the reason why the atomic radius of Te is less than the ionic radius of Te²− is because of the Electrostatic force of repulsion between the negatively charged electrons of Te²- thereby causing the ion to be bigger than the neutral atom.
We must remember that negative ions are formed as a result of the addition of electrons to an atom.On this note, the electrostatic force of repulsion between the negatively charged electrons of Te²- ion becomes greater. Hence, the Te atomic radius is less than the ionic radius of the Te²- ion.By considering the second scenario, the element oxygen is positioned so far on the right because it has a very much smaller nuclear charge compared to Te.
As a result, in the PES spectrum, the 1s sublevel of oxygen lies far to the right of the 1s sublevel of Te.
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