Answer:
a chemical reaction
Explanation:
Answer:
When vinegar comes in contact with baking soda, a cascade of two chemical reactions takes place. The result is carbon dioxide gas—a product of the reactions—bubbling up in a water solution. The bubbles create the fizz and sizzling sound.Baking soda is bicarbonate (NaHCO3) and vinegar is acetic acid (HCH3COO). One of the products this reaction creates is carbon dioxide, which makes the bubbles. When the baking soda meets the vinegar, there is a chemical reaction as carbon dioxide gas is created and fills the balloon causing it to inflate.
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How can a charged balloon attract a wall without any contact?
The positive charges of the uncharged wall move to the outside.
The wall changes shape and the positive charges move to the inside.
The negatively charged balloon repels and moves away from the wall.
A positive charge in the balloon attracts the negative charges in the wall
Answer:
A positive charge in the balloon attracts the negative charges in the wall
Explanation:
The question states attract, so we know it's not going to be option C.
The wall clearly doesn't change shape, so that eliminates option B as well.
The balloon gets positively charged, and so for an attractive force to appear, you need the opposite charge from the wall, i.e. negative.
Remember: opposite charges attract
Which means, the only option that makes sense is Option D.
P.S.: You could've concluded it's option D just because it's the only one that contains the word "attract" in there!
Hope I helped! :)
Answer:
a positive charge in the ballon attract the negative charge of the wall
Explanation:
How many chiral carbon atoms are present in a molecule of 2,3,4-trichloropentane?
Answer:
The answer is 2.
Explanation:
What should scientists do when they see that the data collection or analysis
from their experiment has limitations?
O A. Ignore the limitations when they draw conclusions.
O B. Repeat the experiment to see if it still has limitations.
C. Decide not to report any of the experimental results.
O D. Describe the limitations in detail in their final report.
Answer:
D. Describe the limitations in detail in their final report.
Explanation:
Answer:
D. Describe the limitations in detail in their final report.
HELP MEEE
What is the identity of the atom shown?
A) Fluorine
B) Neon
C) Nitrogen
D) Potassium
15 POINTS
Answer:
A FLUORINE
Explanation:
Explanation:
Option A, Fluorine is the correct answer, because it has 9 electrons in its shells.
hope this helps you.
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
Answer:1, 2, and 4
Explanation:
covalent bonds are not ionic. the elements SHARE electrons
Which of the following are properties of compounds formed by covalent bonding (Select all that apply)
1. When you dissolve an covalent compound in water, the solution does not conduct electricity.
2. Covalent compounds often have lower melting points than ionic compounds.
3. When you dissolve an covalent compound in water, the solution conducts electricity.
4. Covalent compounds form when combining two or more nonmetal atoms.
5. Covalent compounds form when combining a two metal atoms.
6. Covalent compounds form when combining a metal atom with a nonmetal atom.
The properties of covalent compounds are option 2, 3 and 4. Covalent bonds are weaker than ionic bonds.
What are covalent bonds?Covalent bonds are formed by sharing electrons between two atoms. Non metals with comparable electronegativities forms covalent bonds. They are weaker than ionic bond. Thus have lower melting point.
Melting point depends on the bond strength that's why covalent compounds have lower melting point compared with ionic bonds.
Polar covalent bonds can conduct electricity when dissolved in water because of the presence of free electrons. Thus option 3 is correct.
Hence, the properties in option 2, 3 and 4 are correct for covalent compounds.
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how is an inoculating loop or needle sterilized prior to use?
Answer:
it is placed over a bunsen burner to heat up and remove all bacteria
Explanation:
The figure above shows two closed containers. Each contains the same volume of acetone in equilibrium with its
Yanar at the same temperature. The vapor pressure of the acetone is
The vapor pressure of a liquid and the prevailing atmospheric pressure,
determines the boiling point temperature.
The vapor pressure of the acetone is the same in both containers because
the temperature is the same.
Reasons:
The vapor pressure of a liquid is the pressure at which the number of
molecules entering the gaseous phase are in (dynamic) equilibrium with
the number of molecules entering the liquid phase.
The factors that affect vapor pressure are;
The type of molecules that make up the liquid or solidThe temperature of the liquid or solidChanging the surface area changes the instantaneous concentration of
molecules of vapor above the liquid, however, an equilibrium vapor
pressure is reached with time as more molecules enter or exits the liquid
(or solid) due being over or under saturated.
Therefore, the surface area of the liquid has no effect on a liquid's vapor
pressure therefore;
The vapor pressure in both containers will be the same because the temperature is the same.
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what is formed when the number of electrons is changed?
Answer:
Explanation:
Whether the electrons are added or given away makes no difference to the name given to parent atom -- It is called an ion which means that it has a charge. The word atom is reserved for something on the periodic table that has no charge.
Answer: Chemical bond formed when one or more electrons are transferred from one atom to another.
Explanation: Give me the brainiest
how many electrons can occupy a filled 3rd energy level
Answer:
The third energy level can actually hold up to 18 electrons2. A student wants to calculate the heat gained of 100 grams of water in order to
calculate the specific heat of a metal in the following problem. The water is
heated from 25C to 50C when the metal is added. The specific heat of water is
4.18 J/gºC. Use Q=m x CXAT*
5,225 J
10,450 J
20,900 J
Taking into account the definition of calorimetry, the correct answer is the third option: The heat exchanged is 10,450 J.
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
The amount of heat (Q) necessary to vary the temperature of a mass (m) of a substance is proportional to the change in its temperature (∆T) and to that mass. So, the equation that allows calculating heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
c= 4.18 [tex]\frac{J}{gC}[/tex]m=100 gΔT= Tfinal - Tinitial= 50 C -25 C= 25 CReplacing in the expresion for calorimetry:
Q = 4.18[tex]\frac{J}{gC}[/tex]× 100 g× 25 C
Solving:
Q= 10,450 J
Finally, the correct answer is the third option: The heat exchanged is 10,450 J.
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Trường hợp nào sau đây là chất tinh khiết
Which of these is known as a push or pull upon an object that results from its interaction with another object?
Answer:
b
Explanation:
Answer:
force or velocity
Explanation:
I am not sure
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that
can kill someone in minutes. How many molecules is this?
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone in minutes molecules are 9.03 × 10 ²³ molecules.
What are moles?Moles are the smallest unit of a molecule that participates in the formation of the molecules to compete in a reaction and the value will be equal to the Avogadro number 2.303 × 10 ²³.
To calculate the total number of molecules the value of one mole is 2.303 × 10 ²³. so, for 1.50 moles of hydrofluoric acid will be,
1.50 moles = 2.303 × 10 ²³.moles
hydrofluoric acid molecules = 1.50 × 2.303 × 10 ²³
hydrofluoric acid molecules = 9.03 × 10 ²³ molecules.
Therefore, 9.03 × 10 ²³ molecules are present in the container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone.
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Words are on the right please help!
Answer:
1.Frequency
2.Amplitude
3.Wavelength
4.Medium
5.Back and Forth
6.Up and Down
Explanation:
CORRECT ME IF I'm wrong
Which immunization is available to prevent communicable disease and illness?WILL MARK BRAINLIEST 30 PTS
bronchitis
diabetes
measles
strep throat
Measles is a communicable disease that requires immunization to prevent illness when exposed to it.
Measles is a communicable disease and highly contagious. It is usually very serious in children. The disease can be contacted through droplets in the air, physical contact and through mother-to-child transmission.
It is a very serious disease as it is caused by a virus which replicates very fast in the throat and nose thereby creating symptoms such as runny nose, coughing, sneezing and is usually accompanied with a rash.
The severity and death rates is what gave rise to the creating of a measles vaccine which is usually given to babies after birth to make them immune to the potential exposure to the virus.
Diabetes, bronchitis and strep throat have no vaccine as they can always be treated or managed with over-the-counter drugs.
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please help???? i dont know this
Answer:
a and b
Explanation:
Answer:
The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants
A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda carbon-dioxide gas is released.
The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.
Explanation:
Chemical change is defined as those change in which arrangement of atoms present in the substance changes and leads to formation of new substance.
The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants
A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda carbon-dioxide gas is released.
[tex]CH_{3} COOH+ NaHCO_3[/tex]→[tex]CO_2+H_2O+CH_3COONa[/tex]
The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.
[tex]Cu+O_2+CO_2+H_2O[/tex]→[tex]Cu_2(OH)_2CO_3[/tex]
Physical change is defined as those changes which leads to change in shape, size or state of the substance changes. No new substance is formed.
Can you answer my question in SCIENCE... Directions: Below are the reactants and products of photosynthesis. Choose the chemical symbol that matches the word.
Answer:
Water :H2O
Carbon dioxide :CO2
Oxygen :O2
Glocuse :C6H12O6
Answer:
water = H20
carbon dioxide = CO2
oxygen = 02
glucose= C6H1206
Explanation:
Someone pls help me I will make you brain
The phenomenon is known as the Greenhouse Effect.
When the sun's energy reaches the Earth, some is reflected into space, but the rest is absorbed by gases and warms the atmosphere. The phenomenon is known as the Greenhouse Effect.
how did dalton advance the atomic philosophy proposed by democritus
Answer:
(Hope this helps can I pls have brainlist (crown)☺️)
Explanation:
Dalton turned Democritus' views on atoms into a scientific theory by employing experimental methods. Atoms can join or detach during chemical processes, but they never transform into a different atom.
Dalton was an excellent polymath, a natural philosopher, and a real scientist. His thorough investigations prompted him to suggest an early atomic theory for which exceptions would be difficult to uncover today:
Dalton offered the following:
Atoms are microscopic particles that make up elements. Atoms of the same element have the same size and mass; however, atoms of other elements have varying sizes and masses when compared to atoms of other elements. Subdivision, creation, and destruction of atoms are all impossible.
All of these ideas were developed after a great deal of testing. Other researchers may replicate his work, and new findings could be included into this atomic idea.
Democritus, on the other hand, was a 5th-century BC Greek philosopher. He conducted no experimental work as far as we know, and none of his publications have survived. He postulated that matter was made up of a single indivisible element known as an atom; the word atom originates from the Greek word oos, which meaning "uncuttable" or "indivisible." So the name atom might be a homage to Democritus.
If the xylem vessels of a plant are plugged :
a)
No food will be made
b)
The plant will wilt (shrivel)
c)
The leaves will turn yellow
Answer:
b is right answer because xylem provide nutrition and water to the plant
Which unit could be used to measure volume?
Need help
Answer:
A
Explanation:
Because it milliliter and litre is used to measure volume not meter or millimeter
a molecule that carries information across a synaptic cleft is a
Why do you think lone pairs of electrons create greater repulsion when located near other
lone pairs or bonding pairs? Orbitals containing lone pairs of electrons require more space
than orbitals containing bonding pairs. Why do you think this is the case? What does the
presence of one or more lone pairs of electrons do to the bond angles in a molecule (in other
words, do bond angles get larger, smaller, or remain unchanged?)
When there are lone pairs on the valence shell of the central atom in a molecule, the bond angle is decreased.
The shape of molecules depend on the number of electron pairs on the valence shell of the molecules. These electron pairs could be lone pairs or bond pairs. Lone pairs occupy more space around the central atom since it is attracted to only one nucleus compared to bond pairs which are attracted to two nuclei.
When lone pairs are present on the central atom in a molecule, they tend to "squeeze" the molecule thereby decreasing the bond angle in the molecule. Hence, presence of one or more lone pairs of electrons make the bond angles get smaller.
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what is the name of an interaction that would form between two ions?
Answer:
Intermolecular forces: are the forces of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions ).
The interaction that would form between the ions (opposite charged) is called the ion-ion interaction.
What is the ion-ion interaction?Ion-ion interactions are attraction forces between ions that are oppositely charged. They are also known as ionic bonds and are the forces that held together ionic compounds.
The oppositely charged ions floating around in a vacuum will be attracted toward each other, and the attraction will become stronger as they move closer. When they finally stay together and take a considerable amount of energy to separate them.
They produce an ion-pair, a new particle that has a positively and negatively charged surface. The clusters tend to develop because these ion pairs and free ions have strong connections and finally fall out of the gas state as a liquid or solid.
The attraction forces of ions with opposite charges are called ion-ion interactions. The ions with similar charges repel each other, whereas ions with opposite charges attract.
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Which of the following animals is not a first-order prairie consumer? help fast
hawk
gopher
deer
squirrel
Answer:
The answer would be the hawk.
Explanation:
First-order consumers directly depends on grass or plants for survival.
A hawk gets its food from eating animals.
Again, hope this helps :D
Deduce the total rate change of momentum of a cylinderical shaped object
Rotational versus translational kinetic energy; Total kinetic energy; Acceleration of a rolling object. Example scenarios. Rolling cylinders.
What two factors must be held constant for density to be a constant ratio?
Answer:
Temperature and Pressure
Explanation:
Temperature and pressure cause change in volume.
So any change in volume will alter the ratio of density as given by equation of density.
Density = mass/ volume
Change in volume will alter the ratio.
Kindly mark it branliest if the answer is little bit satisfying.
.
You should be able to
these groups on the periodic table, and know their
properties.
Answer:
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties.
Explanation:
I HOPE NAKATULONG PO AKO:)PA BRAINLEST NLNG PO SANA:(why don't electrons, which are attracted to the protons in the nucleus, simply fall into the nucleus?
Answer:
electrons are fermions, they can only access an energy level if it has not already been occupied by another electron. Thanks to this principle, there is a minimum energy level within the atom and it is not possible for an electron to collapse to the nucleus because it cannot exceed this} threshold.
Explanation:
I hope I have helped you.