Chemistry High School
Answers
Answer 1
Answer:
Option-B (Carbon and Silicon)
Explanation:
Among the given pairs only carbon and silicon have the most similar properties. This is because,
Sodium and Magnesium belong to different groups. Sodium present in Group I has one electron in its valence shell and capable of transferring only one electron while, Magnesium present in Group II have two electrons in its valence shell and is capable of donating two electrons. Hence, both show different properties.
Example:
2 Na + Cl₂ → NaCl
Mg + Cl₂ → MgCl₂
As shown in reactions when Sodium and Magnesium are treated with Cl₂ they give a products with different proportions.
Carbon and Silicon show almost same properties because both belong to Group IV hence both are capable of forming four bonds. Also, they share the same property of self linkage in making a long chains.
Argon and Chlorine also belong to two different groups. Argon is present in Group VIII (Noble Gases) and Chlorine is present in Group VII (Halogens). Hence, Argon is an inert specie which is non reactive while Chlorine gives different reaction easily.
Potassium and Calcium belong to different groups. Potassium present in Group I has one electron in its valence shell and capable of transferring only one electron while, Calcium present in Group II have two electrons in its valence shell and is capable of donating two electrons. Hence, both show different properties.
Example:
2 K + Cl₂ → KCl
Ca + Cl₂ → CaCl₂
As shown in reactions when Potassium and Calcium are treated with Cl₂ they give a products with different proportions.
Related Questions
Which of the following is an example of how a scientist might use a model? A. The end of a slinky is moved vertically up and down to simulate a wave
B. A wrench is used to tighten a nut onto a piece of wood
C. Stopwatches measure the amount of time it takes for runners to complete a mile
D. Microscopes are used to magnify a group of cells on sets of slides
Answers
D Microscopes
because they use them for DNA
a,b,and c, all you an item that can be used and not tested with.
The answer is 100% A
The slinky is the model... it simulates a wave.
A wrench, stopwatch, or microscope is not a model.
In everyday speech the words precision and accuracy are often used interchangeably. When these terms are used in science are their meanings the same as their everyday meanings?
Answers
Answer:
No, in science their meanings are not the same as their everyday meanings.
Explanation:
In Science, Precision and Accuracy are defined as,
Accuracy:
Accuracy is the value which is closest to the known or standard value.
Precision:
While, Precision is the value of closeness of two measured values to each other.
Example:
Let suppose in Chemistry Lab you weight an object as 50 g. While the actual weight of that object is 30 g. It means your reading is not accurate.
On second measurement you find that the object weight is 31 g. This time your reading is not precise.
In everyday speech, the words precision and accuracy are often used interchangeably. When these terms are used in science, are their meanings the same as their everyday meanings?
Answers
Answer:
No, in science their meanings are not the same as their everyday meanings.
Explanation:
In Science, Precision and Accuracy are defined as,
Accuracy:
Accuracy is the value which is closest to the known or standard value.
Precision:
While, Precision is the value of closeness of two measured values to each other.
Example:
Let suppose in Chemistry Lab you weight an object as 50 g. While the actual weight of that object is 30 g. It means your reading is not accurate.
On second measurement you find that the object weight is 31 g. This time your reading is not precise.
How does igneous rock turn into sediment?
Answers
Igneous rocks turns into sediments by time through the action of wind or water from rivers. This process is called weathering. Weathering of rocks leads to sand formation and beaches also
What is ingenious rocks?
Igneous rocks are the result of crystallization of molten rocks followed by solidification. They are also called as magmatic rocks. Igneous rocks turns to sediments over the time.
The time taken for the sediment formation depends on the force of sea currents and waves and their direction.
Molten rocks will undergo weathering when they are constantly comes in contact with river water or sea water or wind. They break down then into pebbles and sand and ultimately forms sediments by the sea.
Therefore, by the action and water or wind igneous rocks undergo weathering and forms sediments.
To learn more about igneous rocks, refer the link below:
brainly.com/question/719105
#SPJ2
Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. ... Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals
Given that 1000 g = 1 kg, how many grams are equal to 52.3 kg?
Answers
The answer mate is 52300
Teams of scientists work together to explore space. Which achievement did not involve chemists? A.
determining the composition of moon rocks
B.
calculating the distance between objects in the solar system
C.
identifying regions of Mars that once held water
D.
identifying helium as a gas on the sun’s surface
Answers
B. caulculating the distance between objects in the solar system
What is the frequency of a wave with a wavelength of 6.40 x 104 meters?? 1.87 x 10−6Hz
2.13 x 10−4Hz
4.69 x 103Hz
1.92 x 1013Hz
PLEASE HELPPPPPPPPPPPPPP
Answers
Answer:-
Solution:- Wavelength is given and we are asked to calculate the frequency. The equation that correlates frequency with wavelength is:
where, is the symbol for frequency, c is the symbol for speed of light and is the symbol for wavelength.
Speed of light is and the wavelength is given as .
Let's plug in the values in the equation and so the calculations to calculate the frequency:
(since, )
So, the frequency of the wave is .
Answer:
4.69 x 103 Hz
Explanation:
I took the test and got it right :)
Lead had been used in plumbing and other products since ancient times. How have chemists contributed to our understanding of lead today? A.
They have shown how lead can build up and cause damage in the human body.
B.
They have described how the Romans used lead in plumbing.
C.
They have defended lead as a useful material for many products.
D.
They have passed laws that prohibit the use of lead.
Answers
The answer is option A.
That is A: They have shown how lead can build up and cause damage in the human body.
Lead had been used in plumbing and other products since ancient times. chemists showed that how lead can build up and cause damage in the human body.
Chemists have discovered lead toxicity and showed that it can cause damage in the human body since it is a toxic element.
What process would best separate a solution of liquid water and liquid rubbing alcohol, and why? A. Centrifugation, because water and alcohol have differences in solubility
B. Chromatography, because these liquids have different particle sizes
C. Distillation, because these liquids evaporate at different temperatures
D. Filtration, because water will pass through the filter but alcohol will not
Answers
The best process to separate a mixture of liquid water and liquid rubbing alcohol is distillation, because these liquids evaporate at different temperatures.
Distillation is a method of separation based on differences in boiling points of the liquids.
Liquid rubbing alcohol and water boil at different temperatures. This means that the two liquids will evaporate at different temperatures and be collected one after the other from the distillation column.
Therefore, the best process to separate a mixture of liquid water and liquid rubbing alcohol is distillation.
Learn more: brainly.com/question/15946045
Answer : The correct option is, (C) Distillation, because these liquids evaporate at different temperatures.
Explanation :
Centrifugation : It is a separation process in which the solid substance or particles settle down in a solid-liquid mixture by the action of centrifugal force.
Chromatography : It is a separation process in which the liquid or gas is separated into components at different rate.
Distillation : It is a separation process in which the mixture of liquid separated or evaporated at different temperatures.
Filtration : It is a mechanical separation process in which the solid is separated from the liquid through the filter paper.
Hence, the correct option is, (C) Distillation, because these liquids evaporate at different temperatures.
A chemist is studying how a new type of paper absorbs ink. Which is a macroscopic view of the chemist’s subject? A.
the individual fibers that make up the paper
B.
one sheet of the new type of paper
C.
the chemical composition of the fibers of the paper
Answers
Answer: B. one sheet of the new type of paper.
Explanation: Macroscopic views are the those observable which are presented on the larger scale rather than being on the smaller scale.
Now, it is given that the chemist us studying a new type pf paper that absorbs ink.
Thus option A explains the microscopic view about the individual fibers that make up the paper. Those small fibers which are responsible for the making of the paper.
Option C also explains the microscopic view as it is asking for the chemical composition of the fibers of the paper.
Thus option B is the only macroscopic view which explains the whole one sheet of the new type of water which includes the knowledge of the individual fibers as well as the chemical composition of the fibers as well.
B. one sheet of the new type of paper
Which example does not involve knowledge of chemistry? A.
a firefighter working to put out a fire
B.
a photographer developing color film
C.
an astronomer identifying the stars of a constellation
D.
a medical student learning how drugs work
Answers
I would honestly say C. All others have ingredients in them that makes them work, the combination of stuff to put out the fire, film is made from a certain material and drugs are an ovbious mixture. Looking at the stars is the only thing you don't need chemistry for.
C an astronomer identifying the stars
Which goal or task would most likely be achieved in applied chemistry, not pure chemistry? A.
reducing the cost of manufacturing nylon, an artificial fabric
B.
comparing the chemicals in the shells of turtles, crabs, and lobsters
C.
identifying the properties of a newly-discovered chemical
Answers
A. Reducing the cost of manufacturing nylon, and artificial fabric.
In an experiment, what is the purpose of the control group?
Answers
A control group is the comparison group that helps to "make sure your experiment works." A control group is separated from the rest of the experiment and nothing happens to it kinda like a controlled variable. Controlled variables are the variables in a experiment that remains the same for example a temperature, time, type of products, etc..
Hope this helps!
In an experiement, the purpose of a control group is to make sure the experiment that your working on works!
Which of the following groups contains members with similar chemical reactivity? A) SC,Y,Zr
B) Li,Be,C
C) C,N,O
D)Be,Mg,Sr
Answers
Answer is: D) Be, Mg, Sr.
Beryllium, magnesium and strontium are alkaline earth metals (group 2 of Periodic table of elements).
The elements have very similar properties.
Alkaline earth metals have in common an outer s- electron shell (two electrons). For example, magnesium atom.
Atomic number of magnesium (Mg) is 12, it means that it has 12 protons and 12 electrons.
Electron configuration of magnesium atom: ₁₂Mg 1s² 2s² 2p⁶ 3s².
Does a hydrolysis reaction involves the loss of water
Answers
No, hydrolysis breaks a bond in a molecule using water
What determines the solubility of a molecule in water?
Answers
Factors effecting the solubility of a molecule in water;
a) Polarity:
As water is a polar solvent therefore, the molecule to be dissolved in it should be polar in nature as "Like dissolves Like". Polar means having a partial positive end and partial negative end. As in water oxygen has partail negative charge and hydrogen atoms has partial positive charges so, the molecule must contain these two charges. Therefore, it will develop intermolecular interactions and will dissolve it in water.
b) Temperature:
Solubility of substance increases with increasing temperature. Hence, by increasing temperature the solubility of polar molecule can increase in water.
c) Surface Area:
Greater the surface area greater is the solubility of solute in solvent because it will provide more surface to water solvent to interact with the solute.
Approximately how much greater in mass is a d2o molecule than an h2o molecule? (assume the oxygen atoms have a mass number of 16. deuterium, d, is an isotope of hydrogen with a mass number of 2, 2h.)
Answers
The deuteriuoted water that is consists of an isotope of hydrogen in place of hydrogen from the normal water. The approximate mass of deuteriuoted water and normal water can be calculated as {(2×2)+16} = 20. However the exact mass of is 20.027 g/mole, whereas the mass of water can also be calculated as- {(1×2)+16}=18, however the exact mass of () molecule is 18.015 g/mole. Thus the difference between the mass of the molecules are (20.027 - 18.015) = 2.01 2g/mole.
Answer:
molecule is greater than molecule by 2 amu.
Explanation:
Mass of molecule:
= 2 × 1 amu + 1 × 16 amu = 18 amu
Mass of molecule:
= 2 × 2 amu + 1 × 16 amu = 20 amu
Difference between mass of
molecule is greater than molecule by 2 amu.
How many moles of c atoms are in 1 mol of sucrose (c12h22o11)?
Answers
Use dimensional analysis to solve problems like these.
1 mol C12H22O11 * 12 mol C atoms / 1 mol C12H22O11 = 12 mol of C atoms
Alternatively, you can also think of Sucrose as a molecule with 12 atoms of Carbon, 22 atoms of Hydrogen, and 11 atoms of Oxygen. Each of the atoms represent one mole and since you have 12 Carbon atoms, it would equal to 12 moles of Carbon atoms.
Write the composition of one atom of the 43ca isotope
Answers
Answer:
Number of Protons = 20
Number of Electrons = 20
Number of Neutrons = 23
Explanation:
Number of Protons:
As the number of protons present in the nucleus are equal to the atomic number therefore, using periodic table one can easily find out the atomic number of Ca atom. Hence, Ca is present in group 2 and period 4 and having an atomic number of 20. Therefore, number of protons in Ca atom are 20.
Number of Electrons:
As shown in statement, Ca is not carrying any type of charge. It means this atom is neutral in nature. Which means, it is carrying the same number of electrons as the number of protons in order to give a neutral atom. Therefore, it contains 20 electrons.
Number of Neutrons:
Number of neutrons can be calculated using following formula,
No. of Neutrons = Atomic Mass - Number of Protons
As,
Atomic Mass = 43
So,
No. of Neutrons = 43 - 20
No. of Neutrons = 23
Solid mixture chemistry two or more metals is called
Answers
It’s called ‘an alloy’
it is called an alloy
FAQs
Which elements has properties most similar to sodium? ›
Hence, Lithium has the most similar properties to sodium.
What 3 elements have similar properties? ›One such grouping includes lithium (Li), sodium (Na), and potassium (K): These elements all are shiny, conduct heat and electricity well, and have similar chemical properties.
Which elements have most similar properties? ›The elements that have the most similar chemical properties are those in the same group, or column of the periodic table. Elements are placed in order of atomic number and end up in vertical groups that have the same number of valence electrons and therefore similar chemical properties.
What is similar about sodium and magnesium? ›Both Sodium and Magnesium have third electron shell 3s as their outermost valence electrons, therefore they are in the same period. This period corresponds to the accumulation of electrons in the third (n = 3) shell, especially its 3s and 3p subshells, in a quantum mechanical explanation of atomic structure.