Answer:
Explanation:
If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.
Explain why you can't just make gold out of a random yellow substance like straw or urine.
Answer:
because you cant
Explanation:
how many moles of silver nitrate are needed to produce 6.75 moles of copper (II) nitrate upon reacting with excess copper?
Answer:
13.50 moles of AgNO₃ are needed to produce 6.75 moles of Cu(NO₃)₂
Explanation:
We state the reactants:
AgNO₃
Cu
Then, the products are:
Cu(NO₃)₂
Ag
The reaction is: 2AgNO₃ + Cu → 2Ag + Cu(NO₃)₂
Ratio is 1:2.
The copper is in excess, so the limiting reactant is the silver nitrate:
1 mol of Cu(NO₃)₂ is produced by 2 moles of AgNO₃
Then, 6.75 moles of copper (II) nitrate would be produced by, the double of moles
(6 75 . 2) /1 = 13.50 moles
You have 54.32 grams of PbCl4. How many moles of PbCl4 do you have?
If you show the work that would be great!
In each of the following sets of elements, which element would be expected to have the smallest atomic size?
a) Na, K, Rb
b) Mg, P, S
c) N, P, Sb
d) C, O, F
Answer:
d) C,O,F
Explanation:
because if you add up the atomic no.s (which is directly the size of the element)of each set d) is smallest.
Calculate the volume of 12.0 g of helium at 100° C and 1.2 atm.
Answer:
the answer I think is 76.5L
How many hours are in 188 years
Answer: about 1,705,536 hrs
24 hrs = 1 day
189 hrs = 1 week
756 = 1 month
9072 = 1 yr
1,705,536 = 188 yrs
Explanation:
Trust Milky. Milky smart
1. When water is evaporated from a copper sulfate solution, copper sulfate remain.
Suppose a fox population exists in an ecosystem. Some of the foxes maintain a heavy coat year-round, while others shed their heavy coat in the summer. Summers in this ecosystem
are becoming steadily hotter because of global warming. Which members of the species will most likely be able to adapt to the changing temperatures?
subject science
Answer:
The fox who shed their heavy coat in the summer.
Explanation:
If a fox has the ability to shed its coat in the summer, it will have no difficulties adapting to new temperatures even during winter. However, the heavy-coated one will.
4. How many liters of solution would be needed in a 4.5M solution that contains
101.1g of KNO3?
How does knowing about the structure and function of chromosomes help to explain variation in sexually reproducing organisms?
Answer:
here u go
Explanation:
Sexual reproduction results from the fusion of gametes produced by male and female. Sexual reproduction causes more viable variations because:
→ There might be an error in the copying of DNA, though the event is rare.
→ Segregation of chromosome of maternal and paternal origin at the time of gamete formation is random.
→ There is an exchange of genetic material between homologous chromosomes during formation of gametes.
In case of asexual reproduction, variation is significantly less since only a single parent is involved. Very small changes occur due to inaccuracies during DNA copying that pass on to the progeny. Thus, offsprings of asexual reproduction are more or less genetically similar to their parents. So, it can be concluded that evolution in sexually reproducing organisms proceeds at a faster pace than in asexually reproducing organisms.
The structure and function of chromosomes convey a particular sequence, so any variation in biological reproducing organisms produce a different sequence from chromosomes.
What are chromosomes?In our body 23 pairs of chromosomes are present and 23rd pair is known as the biological chromosome as it is responsible for the gender of new offspring.
Chromosomes are present in the DNA structure and helps in the transfer of genetic material. As we know that in biological reproduction, male and female both are involved and minor change in the sequence of process creates variation in biological reproducing organisms. Like during the meiosis some changes in the cross over process, dynamic union of gametes from male organism, independent assortment during fertilization and many more explains the variation in biological reproducing organisms.
Hence, as chromosomes carry particular sequence so any variation is determined by its structure.
To know more about chromosomes, visit the below link:
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Select odd one out.
I) O
II) Na
III) Cu
IV) Ag
Explanation:
0 is the odd one...............
and rest are metals and they lose electron and 0 gain electron and is non metal
Please help!!! Will give brainlist
Which element in group 2 (Alkaline Earth Metals) is the most reactive?
Be
Mg
Ca
sr
Ba
Ra
Answer:
the reactivity of alkaline earth metals increases from top to the bottom of the group, that's because the atoms get bigger from the top to the bottom so the valence electrons are farther from the nucleus.
write down the formula for B
example:
Hydrogen + Fluorine = Hydrogen Fluorine
help
Answer:
P³⁻ + Cl⁻ --> PCl₃
Explanation:
PCl₃: phosphorus trichloride. prefix in front of chloride is "tri"–meaning three.
Answer:
phosphorus + chlorine = phosphorus trichloride
(He asked for word equation)
Developing Scientific knowledge
Fill in each blank with the word that best completes the statement
Scientists develop knowledge by making
about the natural world that may lead to a
scientific question
A scientific question may lead to an)
which can be tested
The results of
can lead to changes in scientific knowledge.
Answer:
Scientists develop knowledge by making observation about the natural world that may lead to a scientific question.
A scientific question may lead to a(n) hypothesis which can be tested.
The results of experimentation can lead to changes in scientific knowledge.
Explanation:
In the process of developing scientific knowledge, scientists carry out series of observations on what happens in the natural world. This helps them to develop scientific questions. These scientific questions drawn can then lead to hypotheses which are testable.
The testing process leads to experimentation. It is in this process that much scientific questions receive answers. Testing actually lies at the core of scientific inquiry for all scientists. Whatever hypothesis made must always be tested.
The result of the testing or experimentation brings changes in scientific knowledge.
Black hair (B) is dominant to brown hair (b). Cross a black rabbit and a brown hair. The black rabbit had a brown haired mother.
What is the punnet square for this and the genotype and phenotype for this.
Answer:
Genotypic ratio = 1 Bb: 1 bb
Phenotypic ratio = 1 black rabbit : 1 brown rabbit
Explanation:
This question involves a gene coding for hair color in rabbits. The allele for Black hair (B) is dominant to the allele for brown hair (b).
According to this question, a black rabbit whose mother is brown haired (bb) is crossed with a brown hair rabbit. This means that the black rabbit will have a genotype 'Bb' while the brown rabbit will have a genotype 'bb'. Each parent will produce the following gametes:
Bb - B and b
bb - b and b
Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:
Bb, Bb, bb and bb
This means that the;
Genotypic ratio = 1 Bb: 1 bb
Phenotypic ratio = 1 black rabbit : 1 brown rabbit
What atoms in water are attracted to Chlorine?
Answer: hydrogen and oxygen
Explanation:
A researcher notices that atoms of an element x are releasing energy. Why does this happen?
Answer:
The atoms are affected by light.Please give me Brainliest it would mean a lot
What happens when a chemical reaction reaches equilibrium
A solution is found to have a pH of 8.3. What is the hydroxide ion, [OH-]
concentration?
Answer:
[OH-] = 2 x 10^-6 M
Explanation:
Calculate pOH first: 14 - pH = pOH --> pH = 14 - 8.3 = 5.7
[OH-] = 10^-pOH = 10^-5.7 = 2 x 10^-6 M
Only one sig fig in the concentration, because the pH only had one decimal place.
What is watershed management?
Why are fossils not found in igneous or metamorphic rocks?
Answer:
Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.
Explanation:
Hope this helps! :)
Answer:
Because...
Explanation:
Igneous rock is cooked in extreme hot temperatures.
Metamorphoc is lava cooled downed.
Gas in a balloon occupies 3.3 liters. What volume will it occupy if the pressure is changed from 100 kPa to 90.0 kPa, if the temperature is held constant?
Answer:
3.7 L
Explanation:
Initial volume (V₁) = 3.3 L
Initial pressure (P₁) = 100 KPa
Final pressure (P₂) = 90 KPa
Final volume (V₂) =?
The final volume of the gas can be obtained by using the Boyle's law equation as follow:
P₁V₁ = P₂V₂
100 × 3.3 = 90 × V₂
330 = 90 × V₂
Divide both side by 90
V₂ = 330 / 90
V₂ = 3.7 L
Thus, the final volume of the gas is 3.7 L
A 5.00 L flask contains 7.94 g of a gas at STP. What is the molar mass of the gas?
Answer: 35.6 g/mol
Explanation: I guessed and got it correct
The molar volume of any gas behaving ideally at STP is 22.414 L. The molar mass of the gas at STP is 35.59 g.
What is molar mass?The molar mass of a substance is defined as the mass of one mole of molecules. In other words one gram molecular mass of a substance is same to its molar mass in g mol⁻¹.
The molar mass of a substance can be obtained by adding the atomic masses of each elements. At 0°C and 1 atm, 1 mole of any gas behaving ideally occupies a volume of 22.414 L.
Here 5.00 L of the gas at STP has a mass of 7.94. Then the molar mass of 22.414 liters of the gas can be calculated as:
7.94 × 22.414/5.00 = 35.59 g.
Thus the molar mass of the gas is 35.59 g.
To know more about the molar mass, visit;
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Can you quess my Hogwarts house? Please explain why you think that and I will give brainliest
Answer:
I prob can bc I'm a bad b*tch
lol
Answer:
Slytherine
Explanation:
I hope you have a wonderful rest of your day!!!! :)
How many significant figures are in this number? : 2.7 x 10^-3
Answer:
2 significant figures i.e. 2 and 7.
Explanation:
We need to find the number of significant figures in the given number i.e. [tex]2.7\cdot10^{-3}[/tex].
It has 2 significant figures i.e. 2 and 7.
It means the power of 10 doesn't count in the significant figures.
Hence, there are 2 significant figures.
HELP
What is the total pressure of a wet gas mixture at 60°C, containing water vapor, nitrogen, and helium. The partial pressures are
Pnitrogen - 53.0 kPa and Phelium = 25.5 kPa.
Answer:
98.4 kPa
Explanation:
Step 1: Given and required data
Partial pressure of water vapor at 60°C (pH₂O): 19.9 kPa (this info is tabulated)Partial pressure of nitrogen (pN₂): 53.0 kPaPartial pressure of helium (pHe): 25.5 kPaStep 2: Calculate the total pressure of the gaseous mixture
The total pressure of the gaseous mixture (P) os equal to the sum of the partial pressures of the gases that form it.
P = pH₂O + pN₂ + pHe
P = 19.9 kPa + 53.0 kPa + 25.5 kPa = 98.4 kPa
The total pressure of the wet gas mixture is 98.4 KPa
Dalton's law of partial pressureThis law states that at constant temperature, the total pressure of a mixture of gases is equal to the sum of the partial pressure exerted by each gas. Mathematically, it is expressed as
Total pressure = partial pressure of A + partial pressure of B
How to determine the total pressure Partial pressure of water vapor at 60°C (pH₂O) = 19.9 KPa Partial pressure of nitrogen (pN₂) = 53.0 KPa Partial pressure of helium (pHe) = 25.5 KPa Total pressure (P) =?P = pH₂O + pN₂ + pHe
P = 19.9 + 53 + 25.5
P = 98.4 KPa
Learn more about partial pressure:
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A sample of gas is collected over water at a temperature of 35.0◦C when the barometric pressure reading is 642 torr. What is the partial pressure of the dry gas, given PH2O = 42.2 torr? Answer in units of torr.
Answer: The partial pressure of the dry gas is 599.8 torr
Explanation:
According to Dalton's law, the total pressure is the sum of individual pressures.
[tex]p_{total}=p_{dry gas}+p_{H_2O}[/tex]
Given : [tex]p_{total}[/tex] =total pressure of gases = 642 torr
[tex]p_{dry gas}[/tex] = partial pressure of dry gas = ?
[tex]p_{H_2O}[/tex] = partial pressure of water = 42.2 torr
putting in the values we get:
[tex]642torr=p_{\text {dry gas}}+42.2torr[/tex]
[tex]p_{\text {dry gas}}=599.8torr[/tex]
Thus the partial pressure of the dry gas is 599.8 torr
Plz helpppp^^^^^^^^^^
What the concentration of oxygen
Answer:
19.5%
Explanation:
the air required for human breathing is 19.5 percent.
