what are the SI base units for :mass length time and volume
Describe the structure of the beryllium atom.
The beryllium atom, with an atomic number of 4, has a total of four protons and electrons, with two electrons in both the 1s and 2s orbitals. It has two valence electrons in the 2s orbital and can form molecular compounds like beryllium hydride (BeH2) by making two single covalent bonds.
The structure of a beryllium atom can be described by its position as the first element of Group 2 in the periodic table, with an atomic number of 4. This number represents the amount of protons in the nucleus and also the electrons surrounding the nucleus since the atom is electrically neutral. Beryllium's electron configuration includes two inner shell (1s) electrons and two outer shell (2s) electrons, with both shells being s orbitals. Thus, the outermost shell holds the two valence electrons in the 2s orbital.
As a result, the electron dot diagram for beryllium resembles that of helium, with a pair of dots representing the two valence electrons. When forming compounds, such as gaseous beryllium hydride (BeH2), beryllium is capable of making two single covalent bonds, as its small size and comparatively higher ionization energy lead to the formation of molecular rather than ionic compounds. Despite its capacity to form covalent bonds, beryllium typically does not achieve a complete octet in its bonding behavior.
why is the periodic table called the periodic table
The periodic table is called the periodic table because it repeats. All the elements on the periodic table are arranged by atomic number so the elements repeat. It’s almost like in school when you have switch classes they repeat as well. It’s very fascinating to see all these elements organized it the way that that they are.
It’s cold outside and you decide to cook some pasta. As you boil the noodles, the kitchen window begins to fog up. Which processes are at work here?
Final answer:
The processes at work here are evaporation and condensation. When the boiling water molecules gain enough energy to escape the liquid and enter the air as vapor, evaporation occurs. The water vapor then condenses back into liquid form on the cooler window glass, resulting in fog.
Explanation:
The processes at work in this situation are evaporation and condensation.
Evaporation occurs when the boiling water molecules gain enough energy to escape the liquid and enter the air as vapor. This is why the kitchen window fogs up; the water vapor from the boiling noodles comes into contact with the cooler window glass and condenses back into liquid form, forming water droplets that appear as fog.
Condensation is the process by which a gas or vapor changes back into a liquid. In this case, the water vapor condenses on the cold window, which has a lower temperature than the boiling water and causes the vapor to lose energy and revert to its liquid state.
Identical objects are placed in Beaker A and Beaker B. The objects float as shown in the diagram. What can you conclude about the liquid in each of the beakers?
a
Question 6 options:
The liquid in Beaker B has a greater density than the liquid in Beaker A.
The liquid in Beaker A has a greater density than the liquid in Beaker B.
The liquid in Beaker A has a greater density than the objects. The liquid in Beaker B is less dense than the objects.
Both liquids are less dense than the objects.
I think the answers are B or D please help me!
Calculate the wavelength of radiation with a frequency of 8.0 x 10^14 Hz.
The wavelength of radiation with a frequency of [tex]8.0 \times 10^{14} Hz[/tex] is 375 nm, calculated using the relationship between wavelength, frequency, and the speed of light [tex](3.00 \times 10^8 m/s)[/tex].
To calculate the wavelength of radiation with a given frequency, we can use the formula that relates wavelength, frequency, and the speed of light:
[tex]\(\lambda = \frac{c}{f}[/tex]
The speed of light (c) in a vacuum is approximately [tex]3.00 \times 10^8[/tex] meters per second (m/s).
Given the frequency (f) of [tex]8.0 \times 10^{14} Hz[/tex], we can calculate the wavelength by substituting these values into the equation:
[tex]\(\lambda = \frac{3.00 \times 10^8 m/s}{8.0 \times 10^{14} Hz}[/tex]
Now, let's perform the calculation:
[tex]\(\lambda = \frac{3.00 \times 10^8}{8.0 \times 10^{14}} meters[/tex]
[tex]\(\lambda = 3.75 \times 10^{-7} \left meters, \left or \left 375 nm[/tex]
So, the wavelength of radiation with a frequency of [tex]8.0 \times 10^{14} Hz[/tex] Hz is 375 nm.
what kind of rays has the highest amount of energy in the EM spectrum?
Answer:
Gamma rays
Explanation:
Gamma rays have the highest energy,lowest wavelength and highest frequency. On the other hand radio waves have the lowest energy and highest wavelength.
In a chemical reaction, Substance A reacts with Substance B and forms a new substance AB. The chemical equation for this reaction is A + B = AB where A and B are the reactants and AB is the product. If you add more and more of only Substance A, there will be
) Less and less of product AB
b) More and more of product AB with no limit to the amount of AB produced
c) No change in the amount of AB produced
d) More and more of product AB but limited by the amount of B
50 POINTS
the elements iron and oxygen can react to form the compound iron oxide. what type of reaction is this? please explain.
Answer:
Oxidation reaction
Explanation:
Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons
Is mass conserved when 50 g of sugar undergoes a physical change?
the control rods are made of what materials
A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the following hydrocarbon: C 7 H 16 .
Enter the percentages of carbon and hydrogen numerically to four significant figures, separated by commas.
The percent composition of carbon in a given hydrocarbon is 83.91%.
The percent composition of hydrogen in a given hydrocarbon is 16.09%.
Given:
The hydrocarbon ,[tex]C_7H_{16}[/tex]
To find:
The percentage composition (by mass) of carbon and hydrogen in the given hydrocarbon.
Solution:
The atomic mass of carbon atom = 12.0107 g/molThe atomic mass of hydrogen atom = 1.00784 g/molThe molecular mass of given hydrocarbon ,[tex]C_7H_{16}[/tex]:
[tex]=7\times 12.0107 g/mol+16\times 1.00784 g/mol=100.20034 g/mol[/tex]
Number of carbon atoms in a single molecule of given hydrocarbon = 7The mass percentage of carbon in given hydrocarbon:
[tex]C\%=\frac{7\times 12.0107 g/mol}{100.20034 g/mol}\times 100=83.9068\%\approx 83.91\%[/tex]
The percent composition of carbon in a given hydrocarbon is 83.91%.
Number of hydrogen atoms in a single molecule of given hydrocarbon = 16The mass percentage of hydrogen in given hydrocarbon:
[tex]H\%=\frac{16\times 1.00784 g/mol}{100.20034 g/mol}\times 100=16.0932\%\approx 16.09\%[/tex]
The percent composition of hydrogen in a given hydrocarbon is 16.09%.
Learn more about percent composition here:
brainly.com/question/12247957?referrer=searchResults
brainly.com/question/419592?referrer=searchResults
How much energy, in kilocalories, is in the clam chowder?
The energy in clam chowder is measured in kilocalories (kcal or nutritional Calories), which is part of its nutritional information. The actual amount varies depending on specific recipe or brand.
Explanation:The amount of energy, specifically the caloric content, in clam chowder or any other food, is typically detailed in the food's nutritional information. In terms of dietary consumption, energy is usually given in terms of Calories (note the capital 'C'), also known as nutritional calories or kilocalories (kcal). One nutritional Calorie is equal to 1 kcal, or 1000 basic chemistry calories (cal) - this is approximately the amount of energy required to heat 1 kg of water by 1 °C.
However, without specific nutritional information about the particular clam chowder in question, we can't give a specific kcal value. The calories in clam chowder can significantly vary depending on the specific recipe or brand, including variables such as the presence and amount of different ingredients like cream, clams, potatoes, etc.
Learn more about Nutritional Calories in Food here:https://brainly.com/question/32747492
#SPJ2
what is a cells it is my first time to learn science thats why idont know
which part of the amino acid helps identify features that differentiate one amino acid from another
why conduction is slower in a gas than in a liquid or solid.
what is 2000 converted to scientific notation
What are all 4 levels of the energy pyramid? HELP ASAP
where in the atom are the electrons that are involved in chemical bonding located?
how do you overcome or reduce the problem of random error and systematic error while doing experiment
Random errors in experiments can be reduced through increasing the sample size and repeated measurements. For systematic errors, calibration of the instrument, rigorous experimental design and the use of control groups can significantly reduce the errors.
Explanation:The random and systematic errors in experiments can be significantly reduced using a variety of methods. For random errors, increase the sample size and perform repeated measurements to identify and eliminate outliers, thereby increasing the precision of your results.
To overcome systematic errors, calibration of the measuring device should be done before conducting the experiment to ensure accuracy. Experimental design should be rigorously done which includes controlling the environment to eliminate external factors that may affect measurements. The use of a control group and careful observation during experimental manipulation can also reduce systematic error.
Learn more about Reducing Experimental Errors here:https://brainly.com/question/28269575
#SPJ2
Frank and Lisa are analyzing the chart, which shows the speed at which light travels through different media.
Frank says that light travels through diamond with the greatest frequency. Lisa says that light travels through air with the greatest frequency.
Which best describes the accuracy of these statements?
a.Frank is correct because light travels through diamond at the slowest speed, and speed and frequency have an inverse relationship.
b.Lisa is correct because light travels through air at the fastest speed, and speed and frequency have a direct relationship.
c.Neither person is correct because light does not change frequency when it travels through different media.
d. Both people are correct because light has both an inverse and a direct relationship with frequency, depending on the media.
Answer: The correct answer is "Neither person is correct because light does not change frequency when it travels through different media".
Explanation:
The speed of the wave depends on the medium through which it is travelling. The speed of the light is more in the rarer medium than the denser medium.
Frank says that light travels through diamond with the greatest frequency. Lisa says that light travels through air with the greatest frequency. Both are wrong as the frequency remains constant when the light is travelling from one medium to another. The speed of light is lowest in diamond.
Therefore, the correct option is (c).
Water is composed of the same element as hydrogen Peroxide. how do the properties compare
What does object A do when it acts as a transmitter?
When an object acts as a transmitter, it emits electromagnetic waves produced by vibrating charged particles. These waves, carrying energy and information, can induce a current in a receiver like an antenna which can be tuned to detect a specific frequency.
Explanation:When object A acts as a transmitter, it emits electromagnetic waves, such as radio waves. These electromagnetic waves are produced by vibrating charged particles, and propagate outward from the transmitter. This is similar to how a standing wave on a guitar string distributes sound.
For example, in radio transmission, these waves create a feeble current in a conductor such as an antenna. The current or signal in the antenna is then amplified in a radio receiver until it is strong enough to measure or record. The receivers can be tuned to select a single frequency channel, in much the same way as you would tune your television or radio. In advanced applications such as astronomy, more sophisticated data-processing techniques are used to detect thousands of separate frequency bands simultaneously.
In summary, a transmitter such as object A produces electromagnetic waves that carry energy and information from one place to another.
https://brainly.com/question/29774932
#SPJ12
The s subshell can hold up to two electrons in an atom. True or False
Which item is made from a basic ingredient? Soap Tea Wine Vinegar
Answer is: soap.
Soap is a salt of a fatty acid and alkaline (basic) solution. An alkaline solution induces saponification of triglyceride fats into salts of fatty acids.
Toilet soap has sodium and potassim cations. Metallic soap have magnesium and calcium cations.
Sodium soaps, made from sodium hydroxide are firm and potassium soaps, made from potassium hydroxide, are softer or often liquid.
Answer:
soap
Explanation:
im just tryna get them coins sis...
Which statement differentiates between prokaryotic cells and eukaryotic cells?
Eukaryotic cells have DNA; prokaryotic cells do not.
Prokaryotic cells have DNA; eukaryotic cells do not.
Eukaryotic cells have nuclei; prokaryotic cells do not.
Prokaryotic cells have nuclei; eukaryotic cells do not.
Answer:
Eukaryotic cells have nuclei; prokaryotic cells do not.
Explanation:
Eukaryotic cells have a separate organelle named nucleus (plural: nuclei) which is a double membranous structure meant for the storage of genetic material i.e. chromosomes (DNA). Prokaryotes on the other hand have an irregularly shaped structure named nucleoid instead of nucleus. All the genetic material of the prokaryotes is within the nucleoid. Unlike nucleus, nucleoid does not have any nuclear membrane & it is spread in the cytosol freely.
Answer: Eukaryotic cells have nuclei; prokaryotic cells do not.
Explanation: Eukaryotic cells have chromosomes that are enclosed in nucleus and are separated from the cytoplasm by the Nuclear membrane.
Whereas, on the other hand, Prokaryotic cells only have small range of organelles, usually only a plasma memrane and ribosomes.
Which is a sign of a chemical change?
A) Ice cream left at room temperature melts.
B) Calcium chloride is dissolved in H2O and disappears.
C) Paint on a freshly painted wall dries and is no longer sticky.
D)When H2S gas is bubbled into a lead acetate solution, a precipitate forms.
The correct option that indicates a chemical change is D (When H2S gas is bubbled into a lead acetate solution, a precipitate forms), as a new substance is formed which represents a chemical change.
Explanation:A sign of a chemical change is typically indicated by a change in composition and/or appearance due to a chemical reaction. Options A, B, and C are examples of physical changes where there’s a change in the state or appearance without a change in the composition. The correct answer is choice D: When H2S gas is bubbled into a lead acetate solution, a precipitate forms. This is an example of a chemical change as a new substance is formed: lead sulphide, which is the precipitate.
Learn more about Chemical Change here:https://brainly.com/question/31633022
#SPJ2
Predict what might happen if the human body did not have specialized cells, tissues, organs, and organ systems to maintain homeostasis
A compound is found to be 40.0% carbon, 6.7% hydrogen, and 53.5% oxygen. Its molecular mass is 60. g/mol. What is its molecular formula?
which model is most likely used to predict a future event
Answer:
C The Model of Weather systems
Explanation:
I don't Have a Explanation tho there is another explanation before me.