How do two hydrogen atoms bond to form a molecule?
1 each hydrogen atom shares an electron to form a covalent bond
2 each hydrogen atom transfers an electron to form an ionic bond
Answer:
1: each hydrogen atom shares an electron to form a covalent bond
Explanation:
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Potassium iodide is an ionic compound.
Describe what happens, in terms of electron loss and gain, when a potassium atom reacts
with an iodine atom.
Answer:
In this reaction, potassium atoms lose electrons to form positively-charged potassium ions (oxidation) and iodine atoms gain electrons to form negatively-charged iodide ions (reduction).
Explanation:
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In this process, iodine atoms get electrons to produce negatively charged iodide ions, whereas potassium atoms lose electrons to form positively charged potassium ions. Oxidation and reduction takes place.
What is oxidation ?Redox reactions include a change in the oxidation state of the substrate. Similar to how reduction is the acquisition of electrons while oxidation is the loss of electrons or an increase in the oxidation state.
An oxidation process takes place when oxygen interacts with a substance or an element. Another way to think of oxidation is as the process of removing hydrogen from the species of reactants. Molecule, atom, or ion oxidation is the process of losing electrons.
Because they generate new functional groups in molecules or alter existing functional groups, oxidation processes are crucial in the synthesis of organic substances.
Thus, the iodine atom also experiences a change. The iodide atom gets one electron during the reaction with potassium, leaving it with eight electrons at its outer energy level.
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what are some chemical properties of lead besides it’s melting and boiling points
Answer:
Atomic mass. 207.2 g.mol -1. Electronegativity according to Pauling. 1.8. Density. 11.34 g.cm-3 at 20°C. Melting point. 327 °C. Boiling point. 1755 °C.
Explanation:
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which level of protein structure do beta-pleated sheets and alpha helices represent?
since we cannot measure to absolute zero, how can we determine what the volume will be at that temperature?
Answer:
We can measure volumes approaching absolute zero and then predict what the volume would be at absolute zero.
Since there is NO molecular motion at absolute zero, the volume of a balloon at absolute zero should be zero.
If you headed to the deepest recesses of intergalactic space, shielded from starlight, the only thing that would heat you up would be the Big Bang's leftover glow: the cosmic microwave background at 2olume.ht v725 K. At that temperature, the balloon would have a volume.
Charles' Law asserts that a gas's volume (V) and temperature (T), which must be expressed in Kelvin, are directly proportional to one another. A change in temperature of one Kelvin unit corresponds to a change in one Celsius degree. Never forget that the value 0 on the Kelvin scale corresponds to -273 or "Absolute Zero."
What will the volume be at absolute zero, and how can we calculate it?Charles's Law, V = a T+ b, is used to calculate absolute zero once the mass measurements are transformed to high and low temperature gas volumes.
The volume of an ideal gas would theoretically be 0 at absolute zero, and there would be no more molecular motion. Actually, above this temperature, all gases condense into solids or liquids.
According to Boyle's Law, gas volume grows as pressure lowers. Charles' Law states that when the temperature rises, the volume of the gas increases.
Gases compress infinitely as the temperature is lowered because there is a linear relationship between temperature and pressure for the majority of gases (see gas laws). The volume of an ideal gas would theoretically be 0 at absolute zero, and there would be no more molecular motion.
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If the atomic number is bigger then is the nuclear charge also bigger
Answer:
No
Explanation:
When atomic number is increasing its atomic mass increases
Atomic number doesn't affect nuclear charge
1.5 of potassium ioxcide in 150cm^3 of solution
Answer:
Explanation:
I'm not sure what is being asked, not the units of "1.5." I don't know of potassium "ioxicide." Was "dioxide" intended?
I'll assume the question is "What is the concentration, in Molar, of 1.5g of potassium dioxide in 150cm^3 of water (150cm^3 is 150 ml).
The molar mass of K2O, potassium dioxide, is 94.2 g/mole. 1.5g is (1.5g/94.2 g/mole) or 0.0159 moles of K2O. The definition of Molar is moles/liter. So take the moles of K2O and divide by the liters, which is 0.150L in this case.
(0.0159 moles K2)/0.150 L = 0.106 M K2O
Which statement best describes property’s of elements
Answer:
matter
Explanation:
some elements are solid
some are liquid and gas
which under one property
Which one of these is an example of a virus that can affect a range of hosts? A) the varicella virus B) the rabies virus C) the rhinovirus D) the rubella virus
Answer:
B) the rabies viru
Explanation:
I'll pay someone to do my chemistry work.
Answer:
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Explanation:
ADVANTAGES AND DISADVANATAGES oF genectic enginerring
Advantages of Genetic Engineering?
1. It allows for a faster growth rate.
2. It can create an extended life.
3. Specific traits can be developed.
Plants and animals can have specific traits developed through genetic engineering that can make them more attractive to use or consumption. Different colors can be created to produce a wider range of produce. Animals can be modified to produce more milk, grow more muscle tissue, or produce different coats so that a wider range of fabrics can be created.
4. New products can be created.
5. Greater yields can be produced.
Genetic engineering can also change the traits of plants or animals so that they produce greater yields per plant. More fruits can be produced per tree, which creates a greater food supply and more profits for a farmer. It also creates the potential for using modified organisms in multiple ways because there is a greater yield available. Modified corn, for example, can be used for specific purposes, such as animal feed, ethanol, or larger cobs for human consumption.
6. Risks to the local water supply are reduced.
Because farmers and growers do not need to apply as many pesticides or herbicides to their croplands due to genetic engineering, fewer applications to the soil need to occur. This protects the local watershed and reduces the risk of an adverse event occurring without risking the yield and profitability that is needed.
7. It is a scientific practice that has been in place for millennia.
Humans in the past may not have been able to directly modify the DNA of a plant or animal in a laboratory, but they still practiced genetic engineering through selective breeding and cross-species or cross-breeding. People would identify specific traits, seek out other plants or animals that had similar traits, and then breed them together to create a specific result. Genetic engineering just speeds up this process and can predict an outcome with greater regularity.
What Are the Disadvantages of Genetic Engineering?
1. The nutritional value of foods can be less.
When animals grow, and mature quickly, the nutritional value of that product can be reduced. This can be seen in poultry products today with the white striping that is found in meat products. That striping is a fat deposit that was created, often in the breast meat, because of the rapid growth of the bird. In chickens, Good Housekeeping reports that this can increase the fat content of the meat consumed by over 220%. At the same time, the amount of protein that is received is also reduced.
2. Pathogens adapt to the new genetic profiles.
Genetic engineering can create a natural resistance against certain pathogens for plants and animals, but the natural evolutionary process is geared toward creating pathways. Bacteria and viruses evolve a resistance to the resistance that is created by the genetic engineering efforts. This causes the pathogens to become stronger and more resistant than they normally would be, potentially creating future health concerns that are unforeseen.
3. There can be negative side effects that are unexpected.
Genetic engineering is guaranteed to make a change. Many of those changes are positive, creating more and healthier foods. Some of those changes, however, can be negative and unexpected. Making a plant become more tolerant to drought might also make that plant become less tolerant to direct sunlight. Animals may be modified to produce more milk, but have a shortened lifespan at the same time so farmers suffer a greater livestock.
4. The amount of diversity developed can be less favorable.
At some point, genetically engineered plants and animals make it “into the wild” and interact with domestic species. This results in a crossing of “natural” and “artificial” organisms. The engineered organisms often dominate, resulting in only a modified species over several generations, reducing the diversity that is available.
5. Copyrighted genetic engineering can have costly consequences.
Many companies copyright their genetic engineering processes or products to maintain their profitability. If a farmer plants genetically modified crops and the pollination process causes another farmer in the field over to have those modified crops grow, there have been precedents for legal actions against the “unauthorized” farmer. This can have several costly consequences, from fewer farmers wanting to work to a higher cost for the seeds that are planted.
6. This knowledge and technology can be easily abused.
At the moment, genetic engineering in humans is being used to treat specific disorders that threaten the health or wellbeing of individuals. In time, the approach in humans could be like what is already being done with plants and animals. Genetic engineering can change specific traits, which could create human outcomes that are ethically questionable or easily abused.
3. How many moles of silver is 8.46x1024 atoms of
silver?
Answer:
14.05 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{8.46 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.053156[/tex]
We have the final answer as
14.05 molesHope this helps you
Write the electron configuration of the element fitting each of the following descriptions. a. The group 2A element in the fourth period b. The noble gas in the fifth period c. The group 2B element in the fourth period d. The group 6A element in the second period
Answer:
a. Calcium: [Ar]4s^2
or 1s^2 2s^2 2p^6 3s^2 3p^6 (= Argon) 4s^2
b. Xenon
c. Zinc
d. Carbon
Explanation:
Group 2A = Alkaline Earth; period 4 shows that the element will be calcium.
To write the Electron Configuration we remember that Columns 1&2 and Helium represent the s-orbital which holds a maximum of 2 electrons. Columns 13 through 18 fill the p-orbital.
Which atom generally obtains a stable configuration by sharing electrons?
phosphorus (P)
magnesium (Mg)
lithium (LI
chlorine (CI)
Answer: Phosphorus (P)
Explanation: Phosphorous has 5 valence electrons so it will share some to become stable.
Answer: Phosphorus(P)
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Answer:3
Explanation:
Kinetic energy in the form of moving waves of light or radiation
Answer:
radiation
Explanation:
Answer:
neither
Explanation:
Kinetic Energy is the physical movement of objects.
Which element most likely has the same number of valence electrons as silicon (Si)?
O germanium (Ge)
O arsenic (As)
O phosphorus (P)
O sulfur (S)
Answer:
germanium (Ge)
Explanation:
both belong to the same group
Answer:
A. germanium (Ge)
Imagine that you traveled to the Moon for a vacation and discovered that your weight is different there. How would your weight be different on the Moon than on Earth? Why would it be different? Does this mean that you ""lost weight"" and need to buy new clothes that fit? Why or why not?
Answer
No you did not lose weight.
Explanation:
Weight is the force acting on an object, Gravity is a force on earth which does not apply to the moon so your weight may change depending in where you are but your mass will stay the same because mass measures the matter of an object ITSELF! Have a nice day....
Answer:
I would take my weight on Earth and divide it by 6. I'd weigh less because the gravitational pull on the Moon is less, and, weight is the measure of gravitational pull. I wouldn't "loose weight" because I'd weigh the same on Earth as I did the day I left (give or take a few pounds).
Explanation:
12. A beginner's bowling ball has a mass of 4.9 kg and a volume of 5.4 liters. Will it float in water,
which has a density of 1.0 g/mL?
Taking into account the definition of density and Archimedes' principle, the beginner bowling ball will float on the water.
But first it is neccesary to know that density is a quantity referred to the amount of mass in a certain volume of a substance or a solid object.
In other words, the density is the relationship between the weight (mass) of a substance and the volume that the same substance occupies.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
[tex]density=\frac{mass}{volume}[/tex]
In this case, a beginner's bowling ball has a mass of 4.9 kg and a volume of 5.4 liters. This is:
mass= 4.9 kg= 4900 g (being 1 kg= 1000 kg)volume= 5.4 L= 5400 mL (being 1L=1000 mL)Replacing in the definition of density:
[tex]density=\frac{4900 g}{5400 mL}[/tex]
Solving:
density=0.907 [tex]\frac{g}{mL}[/tex]
On the other hand, Archimedes' principle says that an object immersed in a liquid experiences an upward vertical force equal to the weight of the volume of the dislodged liquid.
The sinking or floating of an object is determined by its density with respect to that of the liquid in which it is submerged.
Considering water as the liquid where the object is submerged in this case, an object with a higher density than water will sink. In contrast, an object with a lower density than water will float.
In this case, considering that water has a density of 1 [tex]\frac{g}{mL}[/tex], the bowling ball for beginners has a lower density. This indicates that, having a lower density than water, the object will float.
In summary, the beginner bowling ball will float on the water.
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Give reason:
Why Phosphorous is stored under water.
Answer:
Phosphorus ( white) us highly reactive and ignites at about 30°C when exposed to moist air
what is the purpose of the dts other auths and pre audits screen?
Answer:
It allows the traveler to justify questionable expense items.
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Which is the property of nonmetals to evaporate easily?
brittle
dense
liquid
volatile
Answer:
Volatile
Explanation:
Nonmetal are usually volatile, which means it evaporate easily.
--
Easy.
Answer:
Volatile
Explanation:
Nonmetals are usually volatile, so it means that they can evaporate easily.
la masa molecular de la cafeina es de 194,19g ¿cual es la formula molecular de la cafeina ?
Answer:
the formula for the molecular caffeine is C8H10N4O2
Explanation:
percent to mass, mass to mole, divide by small multiply till whole
Why does the reactivity of metals increase from right to left on the periodic table?
Metals on the right have fewer protons, making it harder to attract electrons from other atoms.
Metals on the right have more protons, causing valence electrons to be held more strongly.
Metals on the right have more valence energy levels, so the ability of the nucleus to attract electrons is reduced.
Metals on the right have fewer valence energy levels, so electrons are closer to the nucleus and harder to pull away.
Why does the reactivity of metals increase from right to left on the periodic table?
Metals on the right have fewer protons, making it harder to attract electrons from other atoms.
Metals on the right have more protons, causing valence electrons to be held more strongly.
Metals on the right have more valence energy levels, so the ability of the nucleus to attract electrons is reduced.
Metals on the right have fewer valence energy levels, so electrons are closer to the nucleus and harder to pull away.
Which feature is unique to Group 18 nonmetals?
They have more exceptions to reactivity rules.
They are very nonreactive.
They are very reactive.
They follow a different pattern of reactivity.
Which of the following combination of elements is the most reactive?
Na and Br
Cs and Br
Cs and I
K and I
How does Rb bond with other elements?
Rb loses two electrons.
Rb gains two electrons.
Rb loses an electron.
Rb gains an electron.
The characteristics of the reactivity of the periodic table allows to find the correct answers to the different questions are:
1) Metals on the right have more protons, causing valence electrons to be held more strongly.
2) They are very nonreactive.
3) Na and Br
4) Rb loses an electron
1) The reactivity of a chemical element is the tendency to combine with others, this increases as it has fewer electrons in its last layer and since they are more weakly bonded.
Consequently, halogens have seven electrons in their last shell tends to attract an electron to remain with the full level and the alkaline that an electron has in the last shell tends to lose the electron to remain with a complete shell.
If we examine the periodic table the number of electrons in the last shell decreases from right to left.
Let's review the different claims:
a) False. The elements on the right side have a higher atomic number, therefore more protons.
b) True. The elements have more protons therefore it has to attract other electrons and the reactivity decreases.
c) False. As it has more electrons, it has more energy levels, losing all the electrooens is more difficult, so the reactivity decreases.
d) False. By having more electrons it has more energy levels.
2) What is the unique characteristic of the elements of group 18
The elements of group 18 are the noble gases, they have their last full layer therefore they do not have.
the correct answer is: They are very nonreactive.
3) The reactivity in the period table decreases with increasing period therefore the element of period 3 is the most reactive in this case Sodium and Halogen of group 5 is the most reactive in this case Bromine.
the compound Na and Br is the most reactive of all.
4) Rubidium has 1 electron in its last shell, both in a chemical reaction pole loses the electron.
the correct answer is: Rb loses an electron
In conclusion, using the characteristics of the reactivity of the periodic table, we can answer the different questions..
1) Metals on the right have more protons, causing valence electrons to be held more strongly.
2) They are very nonreactive.
3) Na and Br
4) Rb loses an electron
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The whole Patterns of Reactivity Quick Check for Honors Chemistry is
1) B. Metals on the right have more protons, causing valence electrons to be held more strongly.
2) B. by gaining electrons
3) B. They are very nonreactive
4) A. Cs and Br
5) A. Rb loses an electron
what is the maximum theoretical number of water molecules with which, in theory, one urea molecule can hydrogen bond?
Answer:
The maximum number of molecules that one water molecule can hold through hydrogen bonding is 4 because the two hydrogen atoms of water can form two hydrogen bonds and the two lone pairs on oxygen can also form two hydrogen bonds. hope it helps
Environmental factors can affect an organism's appearance, behavior, and health. For example, in certain reptiles, the temperature of the environment may determine the sex of the offspring. Both genetics and environmental factors determine the observable, physical characteristics of organisms, also called their _______________ in genetics.
a. phenotypes
b. organelle
c. morphology
d. genotype
Answer:
Phenotype
Explanation:
The observable physical characteristics of an organism, as determined by both genetic makeup and environmental influences.
The question is asking about the observable physical characteristics of organisms.
We can eliminate options B and C because they don't make much sense. An organelle is a structure in a cell which conducts cellular functions, and the morphology of an organism is basically the anatomy and physiology of the organism, which isn't quite what we're looking for.
Keeping this in mind, here is some information on prefixes:
geno - relating to genes
pheno - relating to what's observable
The second one sounds a lot like what we're looking for, and just in case, the definition of phenotype is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
Therefore your answer is: A. phenotypes
I will brainless who can answer this all pleaseeeee
Answer:
I think the answer is yellow or White
Explanation:
because it is the visible light that I know
mask me as brainless
thanks
List a few properties that elements in Group 1 have in common.
Answer:
The alkali metals are a group of chemical elements in the periodic table with the following physical and chemical properties:
shiny.
soft.
silvery.
highly reactive at standard temperature and pressure.
readily lose their outermost electron to form cations with a charge of +1.
Explanation:
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explain the periodic table law of element
Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”
What causes the liquid in a thermometer to rise?
Answer:
The level of colored liquid rises when the thermometer is placed in hot water. Heat causes the molecules of the liquid to get farther apart. The molecules of the liquid break down into atoms and take up more space.
Explanation:
