Answer:
the forces holding the atoms get weakened
Answer: It will turn to liquid
Explanation: The substance will turn into a liquid form because the amount of energy in the particles increases.
What does the following element description actually mean? (File below)
A. It means it is an aluminum atom with 27 protons and 13 electrons.
B. It means it is an aluminum atom with 27 electrons and 13 protons.
C. It means it is an aluminum atom with 13 neutrons and 14 protons.
D. It means it is an aluminum atom with 13 protons and 14 neutrons.
E. None of the above.
Answer:
Explanation:
This is an aluminum atom with 13 proton because from what henry said in the year 1914 he said that the number of protons of an element is equal to the number of electrons for an neutral atom..an you expect the number of electrons to be the atomic number.( The number that is used to locate the elements in the periodic table (1869).
And the number of neutron is 13 because form the mass number of the elements and we no that the mass number of an element is the sum of the proton and the neutron..MN=P + N.....so when 13 is substracted from 27 the answer is 14. So the answer is option D.
Pls help thank you I would really appreciate it
Answer:
Explanation:
3618
Nén một hỗn hợp khí gồm 3,0 mol nitơ và 7,0 mol hiđro trong một bình kín, phản ứng có sẵn chất xúc tác thích hợp và nhiệt độ của bình được giữ không đổi ở 450oC. Sau phản ứng thu được 8 mol một hỗn hợp khí.
(a) Tính hiệu suất phản ứng tổng hợp NH3.
(b) Tính thể tích khí amoniac được tạo thành (ở đktc)
The beginning of changing starch to sugar occurs in the stomach.
True or False
I NEED ANSWER'S FAST
Suggest why sodium and hydrogen ions do not diffuse at the same rate
Answer:
sodium has got ionic bonds that are weak
compared to hydrogen covalent bonds that are strong
advantages and disadvantages of chemistry
Answer:
Advantages of chemistry:-
•Basic knowledge of chemistry helps you to read and understand product labels.
•Chemistry can help you make informed decisions.
•Chemistry is at the heart of cooking. ...
•A command of chemistry can help keep you safe!
Disadvantages of chemistry:-
•It isn't a sustainable form of energy. ...
•It can be expensive.
•It can produce harmful waste.
•It can be used to create devastating weapons.
please help me with my question
Answer:
I think it should be B
Explanation:
Covalent bond is between non metals
When separating a mixture using the property of size, which of the following separation methods would you use? A. magnetism B. distillation C. evaporation D. filtration
Answer:
D
Explanation:
The answer is Filtration
When separating a mixture using the property of size, filtration is used in the separation methods would you use. The correct option is D.
What is filtration?Filtration is a process of separating different substances from each other. It is done to separate the different substances from each other. These substances can be solid, gas and liquid.
There are different processes of separation to separate different substances. These processes are magnetism, distillation, evaporation, and filtration.
Magnetism is the process used to separate magnetic substances from nonmagnetic substances. Evaporation is a process of separating the substance from a high boiling point to a low boiling point. Filtration is used to separate using the property of size.
Thus, the correct option is D. filtration.
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Well I need help in number 11, the equation is D=V0T
Answer:
d = 44 km (you have the answer?)
Explanation:
time = 35 minutes * 1 hour / 60 minutes
time = 0.58333 hours.
D = r * t
r = 75 km / hr
t = 0.58333 hours
d = 75 * 0.58333
d = 43.74 km
A chemist investigates the
I) melting point
II) flammability
III) boiling point
of acetone, a component of fingernail polish
remover. Which is/are physical?
1. II only
2. I and II only
3. II and III only
4. III only
5. I. II and III
6. I and III only
7. I only
8. None of these
Answer:
1, 2 & 3
Explanation:
. A chemist investigates the boiling point, melting point, and flammability
of a compound called acetone, a component of nail polish remover.
Which of these properties are physical properties and which are
chemical properties?
Physical ( boiling point and melting point ).
Chemical ( flammability )
Among the properties listed (melting point, flammability, and boiling point), only the flammability of acetone is a chemical property. The other properties (melting point and boiling point) are physical properties since they are associated with changes in state .
The correct option is 1 .
The melting point of a substance is the temperature at which it changes from a solid to a liquid state. This is a physical property because it does not involve a change in the chemical composition of the substance. However, acetone is a liquid at room temperature, and therefore, it does not have a well-defined melting point. It would vaporize (evaporate) instead of melting.
Flammability is a chemical property. It refers to the ability of a substance to undergo combustion when exposed to a flame or ignition source. It involves a chemical reaction, as the substance interacts with oxygen to produce heat and light.
The boiling point of a substance is the temperature at which it changes from a liquid to a gas state. This is a physical property, similar to the melting point, as it does not involve a change in the chemical composition of the substance.
Hence , 1 is the correct option
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Convert 355 degrees C to K.
Answer: 628.15 K
Explanation:
Add 273.15 to any temperature in Celsius to get it in kelvin
Simplify - Factor a
Which particles represent a solid? *
Option 1
Option 2
Option 3
Option 4 - Surface of sun
Answer:
Option 1
Explanation:
Option number 1 is the most compact one which indicates it is a solid
You need these points more than I do =)
Answer: Uh, thanks.
Explanation:
6. Is there any way to predict when a specific piece of candy will land marked
side up or "decayed?" If you could follow the fate of an individual atom in a
sample of radioactive material, could you predict when it would decay?
Explain.
Answer:
No, each piece of candy has a 50% chance of decaying.No, just like the candy, each atom has a 50% chance of decaying each half-life.Explanation:
how soap is made? using potash
Explanation:
Potassium Hydroxide is a type of lye specifically used to make liquid soap. It is also known as potash, lye or even KOH. This is the chemical that induces saponification of the fats and oils to create liquid soap.
Explanation:
Potash can actually be used to make liquid soaps, bar soaps and jelly soaps by adding NaOH of course for solid soaps. You can use all types of potassium salts to saponify lipidsPlant Cell
5
F
G
20 points
Which parts are only found in plant cells?
D
А
С
-A
E
m
G
LL
D
B
С
Answer:
it's the chloroplast but I'm not sure which on is it it might be the F.
32. List three examples of substances. Explain why each
is a substance. (3.1)
Answer: Chemical X H3 and f1
Explanation:
Water molecules are polar covalent molecules. There is a partial negative charge near the oxygen atom and partial positive charges near the hydrogen atoms due to the uneven distribution of electrons between the atoms, which results in the formation of hydrogen bonds between water molecules. The polarity of water molecules contributes to many properties of water that are important for biological pro
Answer:
The water molecule, as a whole, has 10 protons and 10 electrons, so it is neutral. ... The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.
Explanation:
Water molecules are polar molecules, they have a partially positive end and a partially negative end.
Water contains hydrogen and oxygen. The hydrogen and oxygen in water are combined in a ratio of 2:1.
However, oxygen is far more electronegative than hydrogen hence the compound is polar. The dipole in the molecule points towards the oxygen atom which bears the partial negative charge. Hydrogen bears the partial positive charge.
This polarity of water enables extensive intermolecular hydrogen bonding between water molecules. Properties such as high melting and boiling point of water owes to extensive intermolecular hydrogen bonding in water molecules. Indeed, all the physical properties of water are linked to polarity and hydrogen bonding.
Also, this polarity makes water molecule an excellent solvent for many substance especially in biological systems where it functions as the medium for many biochemical reactions.
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The temperature of hot coffee drops upon addition of some cold milk. Is this a chemical change or a physical change
Answer:chemical
Explanation:
Answer: My opinion is that its a physical change
Explanation:
you can always add more coffee to make it hot
1.) What is a scientific method
2.) What must you always do if you want your statement taken seriously
3.) The scientific method starts with a.
help with the 3rd question plslsls I’ll brainlist.
1 - energy 2- heat 3 -plant
Why type of data must be plotted on a graph for the slope of the line to represent density?
Answer:
you need data that has at least one independent variable in order to plot a graph for a slope of the line
Explanation:
Element or Compound
Krypton
Lye
Graphite
Vinegar
The boiling point of ethanol is 78.40 c. A student conducts an experiment and finds a boiling point at 75.70 c. What was the percent error? (Please show work I have no idea how to do this cause we haven't learned it yet)
Answer:
[tex]\% \: error = | \frac{origina - expirimental}{original} | \times 100 \\ | \frac{78.40 - 75.70}{78.40} | \times 100 \\ = \frac{2.7}{78.4} \times 100 \\ =3.44 \\ thank \: you[/tex]
What method could be used to separate the components of gasoline?
Explanation:
The separation of gosoline from crude oil by heating until it reaches its boilling point is a separation technique called fractional distillation .It is the separation of a mixture such oil into their respect fraction.
Answer:
The answer is B, Distillation.
Explanation:
A teacher is instructing students about the states of matter. He wants to compare the
numbers of elements that exist as solids, gases, and liquids at room temperature.
Which kind of illustration should the teacher use to present this information?
The teacher can present this information using a bar chart.
In science, charts are commonly used to present information where comparison is necessary.
Bar charts are especially useful when we intend to show large changes.
In the periodic table, elements exists in various states of matter;
SolidLiquidGasSometimes, as a teacher, you may need to compare the number of elements that exist as solids, gases, and liquids at room temperature.
This comparison is easily brought out using a bar chart since the changes involve large numbers.
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Which of the following diagrams shows a pure substance that is composed of only individual atoms and not molecules?
Answer:
Ar
Explanation:
the last one
The diagram that shows a pure substance which is composed of only individual atoms and not molecules will be: argon gas. Option D is correct.
A pure substance composed of only individual atoms is called an element. In the periodic table, each element is represented by a unique symbol, and its atoms cannot be further broken down into simpler substances by chemical means.
Liquid water: Water (H₂O) is a compound composed of two hydrogen atoms bonded to one oxygen atom. It consists of molecules, not individual atoms.
Hydrogen gas: Hydrogen gas (H₂) is composed of two hydrogen atoms bonded together to form a diatomic molecule. It is not composed of individual atoms.
Carbon dioxide GAS: Carbon dioxide (CO₂) is a compound consisting of one carbon atom bonded to two oxygen atoms, forming a molecule of CO₂.
Argon gas: Argon (Ar) is an element, and in its pure form as a gas, it exists as individual argon atoms (Ar). It is not bonded to any other atoms, and there are no molecules involved. Therefore, argon gas is composed of individual atoms and represents a pure substance.
Hence, D. is the correct option.
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The trachea connects the mouth to the stomach.
True or False?
HEEEEEELLLLLPPPPPPPPPPPPP MEEEEEEEEEEE :(
Answer:
false because trachea connects to the lungs and oesophagus connects from the mouth to the stomach
Answer:
false
Explanation:
It starts with the mouth. The esophagus is a long tube that connects the mouth to the stomach, which is within the ribcage. The stomach is a muscular bag-like structure and forms a J-shaped pouch and is located under the ribcage. The stomach connects to the small intestine.
Each of the following can be used to make observations, except: *
A calculator
A digital scale
Your sense of smell
A microscope
Answer:
Calculator
Explanation:
A calculator is used to make, well calculations
You can use a scale to get information about the weight of an object, and you can observe how weight changes in relation to size etc.
For obvious reasons, you can observe different scents
Again a microscope is an observational tool
which of the following pair has a larger size? a)K or K- b)Br or Br- c)O2- or F- d) Li or Na
Answer:
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Explanation:
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shsjsksosbejzjdhdbdjedhd
dudbskwjxbdbdjsijednjzhenejd3jdbvfbsj
susjdjksuwhwudnjwibdghejdooejejdhdbbsndjl2lekkw
