Answer:
a person or persons murder
Answer: the aerodynamics of hummingbird wings.
Explanation: i got it right
Why are the components of the mixture separated ? Give any 6 reasons........
We need to separate different components of a mixture to separate the useful components from the non-useful or some harmful components.
Examples:
(a) Tea leaves are separated from tea.
(b) Pebbles are separated form rice and pulse.
Explanation:
The mixtures are separated into their components for the following reasons:
1. To remove an undesirable component - Tea is made by boiling tea leaves in water and then adding milk and sugar. After the tea has been made, the used tea leaves become the undesirable component of the mixture 'tea' and are removed from it by using a tea strainer.
2. To remove a harmful component - Foodgrains like rice, wheat, pulses etc. usually contain small pieces of stones and some insects etc. These are harmful to us and are hence removed from the foodgrains before using them.
3. To obtain a pure sample of a substance - Tap water contains some dissolved salts in it so it is an impure mixture. This water is made free of dissolved salts or impurities by the process of distillation and as a result, we get a pure sample of water.
4. To obtain a useful component - Milk is a mixture from which useful component 'butter' is separated.
chuyển hoá Nh3 - chu trình ure
Answer:
umm translate
Explanation:
calculate the number of electrons of ff elements
Answer:
sorry
Explanation:
Thbrtvefvbimfvrcfnhgmn
Explain why powdered magnesium reacts faster with 30cm3 of 2M Hydrochloric acid
than equal mass of Magnesium ribbon with 30cm3 of 2M hydrochlorric acid
Answer:
powder has more surface area than a ribbon since each grain also has its own "spherical" surface area compared to a magnesium ribbon where you can only see the top and bottom of the grains as a collective
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Why is distillation a physical change explain why and how
The process of distillation explains the difference in the boiling points of the components in the liquid mixture by transforming one of them into a gaseous state. ... As no such step occurs in the process of distillation, it is not a chemical reaction but a physical change
11. If
by substituting: one mole for one dozen; methane, CHE
molecules for elephants; 10,000 grams for 10,000 tons. -
Explanation:
if you follow me I will give your answer
how many salt and water would you use to prepare 10% salt solution?
Answer:
We can make 10 percent solution by volume or by mass. A 10% of NaCl solution by mass has ten grams of sodium chloride dissolved in 100 ml of solution. Weigh 10g of sodium chloride. Pour it into a graduated cylinder or volumetric flask containing about 80ml of water.
Explanation:
have a good day
Identify the arrows that represent the process of cooling.
gas
liquid
Answer:
Liquid - Gas is Evaporation & Gas - Cooling is condensation
Explanation:
The given image shows the water cycle in the atmosphere and hydrosphere. The cooling occurs at the clouds by condensation the evaporated water vapor cools down and precipitate as water. Hence, the arrow to the water bodies from the clouds indicates cooling.
What is water cycle?Water cycle is a geological process by which the water content is balanced between the atmosphere and hydrosphere. The heat radiated from the sun makes the water bodies warmer by convection.
The warm water starts to evaporate to the atmosphere. The water vapor reaches the clouds from there after some time the gas starts to cool down by condensation.
The condensed water then precipitates down as rain and fills the water bodies again. The cooling process thus takes place in between the clouds from gas state to liquid state.
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The image related to your question is given below;
Semimetals is a term which refers to
a small group of
elements that lie between metals and nonmetals on the
periodic table.
Scientists always consider that whenever there is an experiment, there is a tendency for a
decrease in the amount of the expected product. Is this result a violation of the law of
conservation of matter? Why or Why not?
The masses conservation law allows us to find that the answer for which the quantity of product is less than are:
There are other competitive competitive chemical reactions. Some of the reactants did not mix. The efficiency of the reaction is less than calculated.
One of the great conservation laws of science is the conservation of mass, therefore the initial mass is equal to the final mass, even in nuclear reactions where part of the mass is converted into energy, if it is taken into account mass and energy this mass-energy relationship is conserved.
In a chemical reaction the constituents mix and form new compounds, in an ideal case all the material of the constituents must react, but in real cases there is some part of the reactants that does not react in the required direction, therefore the amount of product is less than expected.
When adding the moles of the refractants and comparing with the moles of the product and the unreacted or reacted material in other products should be the same.
The fact that there is less product than expected in a reaction is due to the existence of other competitive reactions.
Consequently using the masses conservation law we can find that the quantity of products is less than expected are:
There are other competitive competitive chemical reactions. Some of the reactants did not mix. The efficiency of the reaction is less than calculated.
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Which example is a liquid at room temperature?
(a) bromine
(b) fluorine
(c) chlorine
(d) iodine
Which example is a liquid at room temperature?
answer : bromine.
Answer:
bromine is liquid at room temperature ️....
How many atoms of Oxygen are represented below?
2C9H8O4
Explanation:
nnnnnnnmnnmmnnnn
eight
First atomic bomb was tested where the first atomic bomb was tested in a year
The first atomic bomb was tested July 16th, 1945
210 Miles away south of Los Alamos in New Mexico in the barren plains of Alamogordo Bombing Range
If an ion has a -2 charge, how many extra electrons do you add to the lewis structure
Answer:
add 2 extra electrons
Explanation:
This is because -2 means 2 electrons are gained while +2 means it lost two electrons.
If an ion has a charge of -2, you have to add two extra electrons to its Lewis structure.
The Lewis structure of a compound is a structure that shows the arrangement of electrons in the outermost or valence shell of an atom.
An ion is formed by adding or removing electrons from a specie. The magnitude of the resulting charge depends on the number of electrons added or removed from the specie.
To form a negative charge of magnitude -2, I have to add two electrons to the Lewis structure of the specie.
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Why does water dissolve ionic compounds and solar compounds?
I will mark brainlist please help
1) What is the concentration of a solution that contains 6 moles of solute in 2 liters of solution
• 6M
• 12M
• 7M
• 3M
2) what is the number of moles of solute in 250 mL of a 0.4M solution?
• 0.1 mol
• 0.16 mol
• 0.62 mol
• 1.6 mol
3) the molality of a solution containing 8.1 moles of solute in 4847 g of solvent is
• 39m
• 1.7m
• 0.17m
• 598m
4) which of the following is unchanged when a solution is diluted by addition of solvent?
• volume of solvent
• mass of solvent
• number of moles of solute
• molarity of solution
Answer:
1) 3m
2) 0.1 mol
3) 1.7m
4) number of moles of solute
Explanation:
Select the correct answer.
Which segment of this graph shows a decreasing velocity?
А. A to B
B. B to C
C. C to D
D. D to E
E. E to F
Answer:
A To B
Explanation:
due to distance n time
Hernandez's parents were
farm workers,
A
former
B
server
dairy
D
migrant
Which of the following nonmetals can conduct electricity relatively well
sulfur
iodine
carbon
bromine
Carbon is a nonmetal that can conduct electricity relatively well. Therefore, option (D) is correct.
What is carbon?Carbon is an element that belongs to the 14th period in the modern periodic table. The atomic number and atomic mass of carbon are 6 and 12.01 g/mol. Carbon is a nonmetal and tetravalent as it contains 4 electrons in its valence shell.
Carbon is short-lived but it can be stabilized by its allotropic forms. Carbon has three allotropes which are diamond, graphite, and fullerene. The properties of allotropes of carbon are different because of the different arrangements of carbon atoms.
In graphite, the carbon atoms are arranged in layers and are joined together. The links between the layers of the carbon atoms are weak but links between the carbon atoms in the layer are strong. The layers are slippery in nature which makes graphite soft.
Graphite is the only nonmetal that can conduct electricity and is a good conductor of electricity.
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Which of the following best defines average speed?
It is the speed of an object in a specific direction.
It is an object's speed at a specific point in time.
It is the total distance traveled over the total time.
It is a measure of how far an object moves in a certain time.
Answer:
It is the total distance traveled over the total time .
Answer:
D
Explanation:
Which evidence did Wegener use to develop the theory of continental drift?
The Rocky Mountains are taller than the Appalachian Mountains.
The climate of Siberia has always been the same.
Mountains in North America appear to be part of the same chain of mountains as those in Northern Europe.
There is no evidence of glaciers anywhere in South America.
Answer:
Mountains in North America appear to be part of the same chain of mountains as those in Northern Europe.
Explanation: I think so
I know the answer, I just don't know how my teacher got it. Can anyone teach me how to solve it please.
How many moles of oxygen are present in 0.798 moles of Mg(IO3)2?
Answer: 4.79 mol
Answer:
About 4.79 moles of oxygen.
Explanation:
We want to determine the amount of moles of oxygen are present in 0.798 moles of Mg(IO₃)₂.
From the chemical formula, we can see that there are six atoms of oxygen for every molecule of Mg(IO₃)₂. Therefore, we can say that there are six moles of oxygen for every mole of Mg(IO₃)₂. This yields the following ratio:
[tex]\displaystyle \frac{6\text{ mol O}}{1 \text{ mol Mg(IO$_3$)$_2$}}[/tex]
Multiplying this by the initial value yields:
[tex]\displaystyle 0.798 \text{ mol Mg(IO$_3$)$_2$} \cdot \displaystyle \frac{6\text{ mol O}}{1 \text{ mol Mg(IO$_3$)$_2$}} = 4.79 \text{ mol O}[/tex]
In conclusion, there are about 4.79 moles of oxygen present in 0.798 moles of Mg(IO₃)₂.
what are the elements in group 5 in the periodic table
Answer:
Vanadium (V), Niobium (Niobium), Tantalum (Ta), Dubnium (Db), Cerium (Ce), and Thorium (Th)
Explanation:
Groups go vertical (up and down) on the periodic table.
Periods go horizontal (left to right) on the period table.
Question #1
In a genetics investigation, students used two red straws to represent malo parent DNA. Thoy used two
green straws to represent female parent DNA. The offspring in this activity are best represented by
A
either one red straw or one green straw.
B.
two green straws.
С
two red straws.
one red straw and one green straw.
D
Answer:
D. one red straw and one green straw.
a bottle of acetone contains 55.0mL of acetone. If the acetone has a mass of 43.6 g. What is the density of acetone
Answer:
792.72g/L
Explanation:
density formula
density = mass/volume in L
so the density of acetone = 43.6/0.055
792.72g/L
Answer:
so 43.6g devided by 55.0ml and your density of acetone is 0.79g/ml.
How many mol of hydrogen atoms would be present in 2.51mol of nh3
Write a balanced chemical equation based on the following description:
the reaction of gaseous tricarbon octahydride with oxygen gas produces gaseous carbon dioxide and water vapor
No links or point hunting!
The balanced chemical reaction of gaseous tricarbon octahydride with oxygen gas produces gaseous carbon dioxide and water vapor is as follows: C3H8 + 5O2 → 3CO2 + 4H2O
BALANCED CHEMICAL EQUATION:
Balancing a chemical equation means ensuring that the number of atoms of each element on both sides of the equation is the same. According to this question, gaseous tricarbon octahydride or propane gas (C3H8) reacts with oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and water vapor (H2O). The balanced equation is as follows:C3H8 + 5O2 → 3CO2 + 4H2OLearn more at: https://brainly.com/question/3206228?referrer=searchResults
Help!!!
How does the nucleus change in beta-plus decay?(1 point)
The mass number decreases by one, and the atomic number remains the same.
The mass number remains the same, and the atomic number increases by one.
The mass number increases by one, and the atomic number remains the same.
The mass number remains the same, and the atomic number decreases by one.
Answer:
The answer is: The mass number remains the same, and the atomic number decreases by one.
The rest of the assignment:
Polonium has a large, unstable nucleus. Through which process is it most likely to become stable?
gamma decay
beta-plus decay
beta-minus decay
alpha decay(✔️)
Which type of energy does alpha decay generate?
Potential
Sound
Electromagnetic
kinetic(✔️)
Use the equation to answer the question.
14 6C→14 7N+ 0−1e
Which type of radioactive decay does the equation model?
alpha decay
beta-minus decay(✔️)
beta-plus decay
gamma decay
How does the nucleus change in beta-plus decay?
The mass number decreases by one, and the atomic number remains the same.
The mass number remains the same, and the atomic number decreases by one(✔️)
The mass number remains the same, and the atomic number increases by one.
The mass number increases by one, and the atomic number remains the same.
An unstable nucleus undergoes gamma decay. How does the nucleus change?
It becomes less stable by repositioning its particles.
It becomes more stable by emitting energy and particles.
It becomes more stable by repositioning its particles(✔️)
It becomes less stable by emitting energy and particles.
Hope this helps
Explanation:
An element y has 17 protons in 17 electrons. it gains one electron to form an ion. what will be the charge on an ion .right the number of protons and electrons .write the number of protons and electrons on y in detail
Answer:
A y+B 17 protons and 18 electrons