What is the purpose of the periodic table?
Answer:
the periodic table is important because it is organized to provide a alot of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
Explanation:
Two layers of earth have convection currents
Answer: Mantle and core are the two layers of the earth that have convection currents.
Explanation:
The mantle and outer core are the two layers that are associated with the convection currents. In the mantle the convection currents occur due to the heat emerging out of the core also mantle region releases heat. If the transfer of heat or convection currents stop then the mantle will not flow and the core will not produce magnetic field at all. This will lead to coldness in earth and earth will lose the protection from harmful radiations.
please help asap 10 & 11
Answer:
false
Explanation:
because if one of the p-protein of one is less then then the eyecolor will be different
Scientists often need a catalyst to start a chemical reaction. They need to apply heat, acids, or other materials to jump-start the experiment.
Which phrase is the best definition of catalyst?
A. something hot
b. something acidic
c. something that triggers
d.something that is scientific
Answer:
something that triggers
Explanation:
a catalyst helps move a reaction along
A catalyst shows some specificity in its action. It speeds up only a spontaneous reaction. The best definition of catalyst is something that triggers. The correct option is C.
What is a catalyst?A substance which increases the rate of a chemical reaction without itself undergoing any permanent change chemically or quantitatively is defined as the catalyst and the phenomenon is called catalysis.
It is believed that a catalyst actually participates in the chemical reaction that is speeds up. It forms temporary bonds with the reactants yielding an intermediate activated complex.
A typical example of catalyst is iron (Fe) which is used in the Haber process for the manufacture of ammonia. The catalyst is recovered unchanged in amount and chemical composition at the end of the reaction.
In most cases, a small amount of a catalyst can speed up reaction between large amounts of reactants. A catalyst shows maximum efficiency at optimum temperature.
Thus the correct option is C.
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What is the sequence of coefficients that will balance the following decomposition reaction of dihydrogen monosulfide? H₂S ----> H₂ + S₈
8 S
In this case you must start balancing the sulfur to have 8 on each side of the reaction. So:
Answer:
Explanation:
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts.
The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.
Then, taking into account all of the above, you can determine the amount of elements on each side of the equation:
Left side: 2 H and 1 S
Right side: 2 H and 8 S
In this case you must start balancing the sulfur to have 8 on each side of the reaction. So:
8 H₂S → H₂ + S₈
Now the amount of elements on each side of the equation:
Left side: 16 H and 8
Right side: 2 H and 8 S
Now you need to start balancing the hydrogen to get the same amount from each side of the reaction. So:
8 H₂S → 8 H₂ + S₈
Now the amount of elements on each side of the equation:
Left side: 16 H and 8
Right side: 16 H and 8 S
The balanced reaction is:
8 H₂S → 8 H₂ + S₈
What does the model represent
Solve the equation.
3 - y = 13
y =
Answer:
First we isolate y by doing - 3
-y = 10
Explanation:
-10 since 3- (-10) is actually 3 + 10 which is 13
How is heat transferred through space
Heat is transferred by energy waves moving through space. Explanation: According to research: Radiation is the transfer of heat energy through space by electromagnetic radiation. Most of the electromagnetic radiation that comes to the earth from the sun is invisible
Please give brainiest if possible, I kinda need it. Thnx!
Answer:
the transfer of energy through space is called radiation. through radiation there is no direct contact between heat source and object. sunlight radiation warms the earth's surface; radiation can also come from fires.
SnBr2
what is the name of this formula?
Which type of model is a way of imagining how something works?
Answer:
mental model is an explanation of someone's thought process about how something works in the real world. It is a representation of the surrounding world, the relationships between its various parts and a person's intuitive perception about his or her own acts and their consequences. Mental models can help shape behaviour and set an approach to solving problems (similar to a personal algorithm) and doing tasks.
:)
Tectonic Plates
Tectonic Plates
Which of the following is an accurate description of the movement of the tectonic plates in the diagram?
O A. Plate A is sliding past plate B.
O B. Plate A and plate B are diverging.
OC. Plate A and plate B are of equal density and are colliding.
OD. Plate A is denser than plate B, which results in subduction.
What type of climate is characteristic of temperate grassland
A) warm weather all year long
B) Deep, fertile soil
C) Low annual precipitation
D) Giraffes, zebras, and wildebeests
Answer:
I am expecting that is option is d is correct answer
Explanation:
because in the grassland some animals can live
A student rings a brass bell with a frequency of 300 Hz. The sound wave
travels through brass, air, and glass. What is the wavelength of the wave in
brass?
Medium
Wave speed
(m/s)
Brass
4,700
Air
346
Glass
5,640
A. 0.64 m
B. 1.6 m
C. 0.064 m
D. 16 m
The wavelength of the wave in brass medium, given that the wave has a frequency of 300 Hz is 16 m (Option D)
How do I determine the wavelength in brass?The wavelength of a wave is defined according to the following formula:
Velocity (v) = wavelength (λ) × frequency (f)
Divide both sides by frequency
Wavelength (λ = Velocity (v) / frequency (f)
With the above formula, we can obtain the wavelength of the wave in the brass medium. Details below:
Frequency (f) = 300 HzWave speed in brass (v) of = 4700 m/sWavelength in brass (λ) = ?Wavelength (λ = Velocity (v) / frequency (f)
Wavelength in brass = 4700 m/s / 300 Hz
Wavelength in brass= 16 m
Thus, we can conclude that the wavelength is 16 m (Option D)
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The total pressure of a mixture of hydrogen, oxygen, and methane is 96.4 kPa. The partial pressures of hydrogen and oxygen are 13.5
kPa and 29.3 kPa respectively. What is the partial pressure of methane?
A. 139.2 kPa
B. 53.6 kPa
C. 82.9 kPa
D. 42.8 kPa
Answer:
53.7kPa
Explanation:
Given parameters:
Total pressure of the mixture = 96.4kPa
partial pressure of hydrogen = 13.4kPa
partial pressure of oxygen = 29.3kPa
Unknown:
partial pressure of methane = ?
Solution:
The total pressure of mixture is equal to the sum of their particles pressures;
Partial pressure of methane = 96.4kPa - (13.4kPa + 29.3kPa)
Partial pressure of methane = 53.7kPa
Answer: 53.6
Explanation: I just took the test and got it right.
Based on what you know, which element would you predict would most likely form an anion?
A. iron
B. tin
C. calcium
D. chlorine
Answer:chlorine
Explanation:
Anions are ions of non metals and the only non mental in that list is chlorine (group 7)
What energy transformation occurs as the rabbit eats the grass?
A.
Chemical energy in the grass is transformed into thermal energy in the rabbit.
B.
Electrical energy in the grass is transformed into thermal energy in the rabbit.
C.
Mechanical energy in the rabbit is transformed into electrical energy in the grass.
D.
Thermal energy in the rabbit is transformed into mechanical energy in the grass.
Answer:
Chemical energy in the grass is transformed into thermal energy in the rabbit.
Explanation: Hope this helps
WILL GIVE BRAINLIEST
Select all the correct answers.
Which of these are examples of mixing and separating?
removing seed casings from grains
a soda bottle bubbling when it is opened
a bright copper statue turning green from weathering
removing salt from seawater
water decomposing to oxygen and hydrogen
Answer:
Removing seed casings: separatingSoda bottle bubbling when opened: mixing as before it was opened nothing was happening but as it came in contact with atmosphere it started to bubble.
Bright copper statue turning green from weathering: mixing as all vapors and gases in atmosphere combined with copper of that statue they started to change color of statue
Removing salt from seawater: obviously removing as one component Water decomposing: obviously separating as it's constituent elements are removed from compound and converted into individual elements
when 34 700 j of heat are applied to a 350 g sample of liquid methanol, what must its heat of vaporization be to convert it all to gas?
Answer:
The temperature at which the vapor pressure of a liquid is just equal to the external ... The conversion of a liquid to a gas below the boiling point is called ... equilibrium temperature of the mixture was 36.0 °C. What is the specific heat (J/ g°C) of the metal
Explanation:
please help me with this question/
Answer:
4 of each protons and electrons
Explanation:
since the atomic number is 4 it would contain both the same number of protons and electrons
A student dissolves 8.00 g of NH4NO3(s) in 100. g of H2O(l) in a coffee-cup calorimeter. Based on the initial and final temperatures of the mixture in degrees Celsius shown in the diagram above the laboratory setup, what is the calculated ΔT of the water reported to the appropriate number of significant figures?
Omg please help me im doing so well in science i have a 100 and this if for a grade and i really need t o kkeep that 100
Answer:
b
Explanation:
This means that it takes more energy or heat to increase water's temperature than it does for most other substances. The specific heat of water is greater than that of dry soil, therefore water both absorbs and releases heat more slowly than land.
Describe how PERIODS and GROUPS are set up on the Periodic Table of Elements.
Answer:
Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.
(Love your pfp btw)
Explanation:
When is the Northern Hemisphere tilted toward the Sun?
Answer: Summer Solstice
In North America, around June 21, Earth tilts on its axis toward the Sun. This is called the summer solstice, and it is when the Northern Hemisphere has the most daylight of any time of the year. It is also when the Sun appears to be the highest in the sky, and it has its greatest angle to Earth.
The biggest difference between the equinox and the solstice is that a solstice is the point during the Earth's orbit around the sun at which the sun is at its greatest distance from the equator, while during an equinox, it's at the closest distance from the equator.
Explanation:
Will these groups of elements form ionic or molecular compounds? sodium and Iodine 
Answer:
Ionic
Explanation:
Answer:
carbon and hydrogen are molecular
Explanation:
Triphosphorous hexoxide formula
Answer:
P3O6
Explanation:
Tri=3 Hex=6
The door to the classroom weighs 3 kg. How much work is done when Michael pushes on
the door to the classroom with 15 Newtons of force, pushing the door 1.3 meters?
Work done : 19.5 J
Further explanationGiven
F = 15 N
d = 1.3 m
m = 3 kg
Required
Work done
Solution
Work is the product of force with the displacement of objects.
Can be formulated
W = F x d
W = Work, J, Nm
F = Force, N
d = distance, m
Input the value :
W = 15 N x 1.3 m
W = 19.5 J
the mass has no effect on this problem
Question 5
Which of the following is not an example of mutualism?
If the Earth could no longer sustain human life, where could we go?
Answer:
There is no place in the solar system that can sustain humans except earth. Earth is the only planet that can sustain humans according to what we know and according to the technologies we have. We can live in Mars but the environment might not be suitable for growing vegetation and it might be hard for humans to live in Mars.
Explanation:
Hope this helped!
What is the relationship of transported particle size to water velocity?
Answer:
The faster the water is flowing, the larger the particles that can be kept in suspension and transported within the flowing water.This is the relationship of transported particle size to water velocityExplanation:
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How many atoms are in 4.3 moles of lithium?
