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ANSWER : I AND III
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Related Questions
When you rub an inflated balloonon your head on a dry day,it can make your hair stand up! what force is that?
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When you rub an inflated balloon on your head and it makes your hair stand up, the force that makes the hair stand up is known as static electricity.
When the balloon is rubbed on the head, electrons from the hair atoms move into the balloon, thus making the balloon to be negatively charged and the hair positively charged due to loss of electrons.
Unlike charges attracts. Thus, when you try to pull the balloon away slowly, the positively charged hair and the negatively charged balloon will attract each other and this is usually what makes the hair stand up.
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Answer:
static electricity
Explanation:
this is because there is an imbalance between negative and positive charges
when you keep on rubbing, a negative charge is created which is carried by electrons.
when you pull the balloon away slowly, the opposite charges attract to each other which makes your hair attract to the balloon
AJUTOR VA ROG AM TEST SI MAI AM 10 MINUTE AM NEVOIE DE SUBPUNCTUL C SI D
Answers
Explanation:
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Choose the answer that best completes the sentence below.
Chopping up a fish is an example of a physical change; _______, grilling a fish is an example of a chemical change.
A. as a result
B. for instance
C. including
D. on the other hand
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Answer:
on the other hand
Explanation:
I think its correct
1. Cooking pots are provided with wooden or plastic handles .Why?
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Answer:
So the heat doesn't transfer to the handle and heat it up causing you to burn yourself in cooking process
Explanation:
Hope this helps! Happy Halloween
Cooking pots are provided with wooden or plastic handles because wood or plastic handles are bad conductors of heat. Hence, the heat from the hot appliances does not flow to our hands with the result that we can handle them without any difficulty.
calculate mass in grams of 5.09×10^20 atoms of copper. (Atomic Mass 63.5)
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Explanation:
here is the answer attached
Words are on the right please help!
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Answer:
1.Frequency
2.Amplitude
3.Wavelength
4.Medium
5.Back and Forth
6.Up and Down
Explanation:
CORRECT ME IF I'm wrong
NO LINKS PLS HELP I WILL MARK THE BRAINIEST ANSWER
Answers
Answer:
Option a
Explanation:
simple
Answer:
The two solutions do not react with each other unless the water is boiled off, then the two will decompose.
Explanation:
The formula of alkanes contain 3 5 7 and 9 carbon atoms
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Explanation:
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single.
when the orbitals or energy levels of an atom are full, it is considered to be stable. which atom in the ground state has a stable electron configuration?
Answers
Answer:
Noble gases, atoms which have complete filled outer orbits.
Explanation:
SInce, you have given no options elements like Neon, Helium,etc
Noble elements are the atoms which have stable electronic configuration in the ground state.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Calculate the number of moles of alkali in 25cm3 of NaOH solution used.
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Answer:
0.001mol
Explanation:
volume (NaOH) =25cm³ =0.025dm³
molar volume = 22.4dm³
n = V = 0.025 = 0.001mol
Vm 22.4
which part of the chemical structure differentiates one amino acid from another?
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Answer:
Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. This R group, or side chain, gives each amino acid proteins specific characteristics, including size, polarity, and pH.
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on an energy diagram, where is a stable equilibrium point?
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Answer:
1.2
Explanation:
Which of the following describes a chemical property of oxygen?
Oxygen is a gas at room temperature.
An oxygen molecule has an atomic mass of 32 a m u.
The density of oxygen is 0.00133 grams per centimeter cubed .
Oxygen reacts with iron to form rust.
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Answer:
Oxygen Reacts with Iron to Form Rust is the Correct Answer
a 200 g of sugar was dissolved in 100 ml of water describe the solution
A.diluted
B.concentrated
C. sweet
D. very sweet
................... answer.........pls........
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Answer:
b
Explanation:
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(ii)
Copper and potassium have different melting points and boiling points.
Give one other difference between the properties of copper and potassium.
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Answer:
ExplanationWhat are the properties of potassium?
Image result for give one other difference between the properties of copper and potassium
Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green. It is the seventh most abundant element in Earth's crust, constituting 2.6 percent of its mass.:
Difference between copper and potassium is the valence electron of sodium is in the 3s orbital whereas the valence electron of potassium is in the 4s orbital.
What are the properties of potassium?Potassium metal is soft and white with a silvery luster, has a low melting point, and is a good conductor of heat and electricity.
What are the properties of copper?It is malleable, ductile, and an extremely good conductor of both heat and electricity. It is softer than zinc and can be polished to a bright finish.
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Which of the following are directly proportional? *
volume and temperature
pressure and volume
pressure and temperature
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The mass number is equal to the number of blank in the nucleus of the atom
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Answer:
c
Explanation:
Land can also be called:
A) Money and/or profit
B) Natural Resources
C) Human Resources
Answers
In which range of electronegativity differences would polar covalent bonds occur?(1 point)
−1.0 to 0
0 to 1.0
0 to 0.5
0.5 to 1
This image shows electronegativities of elements on the periodic table. Based on this information, which element is most likely to form a strong ionic bond and take on electrons? (1 point)
fluorine (F)
cesium (Cs)
hydrogen (H)
helium (He)
Which option contains an example of a polyatomic ion?(1 point)
NH4
KNO3
CaCl2
MgCl
Which statement best explains the difference between polar and nonpolar covalent bonds?(1 point)
Polar covalent bonds give/take electrons, while nonpolar covalent bonds share electrons.
Polar covalent bonds share electrons, while nonpolar covalent bonds give/take electrons.
Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
Polar covalent bonds share electrons equally, while nonpolar covalent bonds share electrons unequally
Which statement describes the bonds in iron sulfate, FeSO4? (1 point)
Fe and S have an ionic bond, and S and O have ionic bonds, too.
Fe and S have a covalent bond, while S and O have ionic bonds.
Fe and S have an ionic bond, while S and O have covalent bonds..
Fe and S have a covalent bond, and S and O have covalent bonds, too.
Answers
Answer: 1. (0.5 to 1)
2. (Fluorine)
3. (KNO3
4. (Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.)
5. (Fe and S have a covalent bond, and S and O have covalent bonds, too.)
Explanation:
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The periodic table is an arrangement of elements according to their periodic properties.
Polar covalent bonds are those compounds in which unsymmetrical electron distribution in bonds leads to polarity in the molecule. Examples of such compounds include; HCl, CHCl3, etc. A polar covalent bond occurs when the electronegativity differences between atoms lies within the range of 0.5 to 1.
Since electronegativity increases across the period and we also know that highly electropositive metals(having very low electronegativity) and highly electronegative nonmetals(having high electronegativity) form a strong ionic bond, it follows that fluorine (F) and cesium (Cs) will form a strong ionic bond.
A poly atomic ion is an ion that contains more than one atom. Given the options listed NH4^+ is an example of a polyatomic ion.
The difference between polar and nonpolar covalent bonds is that polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
In FeSO4, Fe and S have an ionic bond, while S and O have covalent bonds.
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how many molecules of water, h2o, are present in 75.0 g of h2o?
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Answer:
150 molecules of oxygen
Explanation:
Between Si, P, Ge, and Se which element has the largest covalent radius?
Answers
In descending order: Ge, Si, Se, P
a thermometer used to measure the temperature of food must be accurate to what temperature?
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Answer:Accuracy Thermometers used to measure the temperature of food need to be accurate to +/-2°F or +/-1°C. Thermometers used to measure air temperature in food storage equipment need to be accurate to +/-3°F or +/- 1.5°C. A hanging thermometer in a walk-in cooler is an example.
Explanation:
A molecule is made up of more than one element ?
Answers
Answer:
Yes it is
Explanation:
How else do you think nitrogen or oxygen is made?
what the differenve between ionisation and dissociation
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Faster Rate: Higher temperature, Lower Rate: Higher temperature
Question 9 (2 points)
(02.04 MC)
John has three cups of sugar particles. Cup 1 has large sugar particles, Cup 2 has medium-sized particles, and Cup 3 has small sugar particles. If
John pours each cup in water, which cup of sugar particles will dissolve the fastest? (2 points)
оа
Cup 1 will dissolve the fastest.
Ob
Cup 2 will dissolve the fastest.
Oc
Cup 3 will dissolve the fastest.
Od
They will dissolve at the same rate.
Question 10 (2 points)
(02.04 MC)
Gina predicts that one really large cube of sugar will dissolve faster than the same amount of sugar in several medium-sized cubes. She thinks
rube. It has more surface area and will dissolve faster than the several medium-sized cubes. What is the
Answers
Answer:
cup c will dissolve the fastest
Explanation:
Because the particle size is smaller, the water can dissolve them quicker as the smaller the particle, the more surface are for the water to dissolve.
what type of carbohydrates provide the body with a sustained release of energy?
Answers
Answer:
Fiber-rich, complex carbs
Complex carbs with fiber take much longer to digest than simple carbs. This helps to maintain stable blood sugar levels because sugar enters the bloodstream gradually . Complex carbohydrates provide sustained energy and help you feel fuller for longer because they are digested more slowly.
Which form of carbohydrates can your body use for energy?Glucose, also known as blood sugar, is the primary energy source for your body's cells, tissues, and organs. Glucose can be used right away or stored for later use in the liver and muscles.Carbohydrates are the body's preferred fuel source because they can be quickly converted to glucose. A light carbohydrate snack right before exercise is a good idea for quick energy. Eat protein with carbs to slow the rate at which your body absorbs them for longer-lasting energy.Fat is the most concentrated source of energy in the body, providing more than twice the potential energy of carbohydrate or protein (9 calories per gram versus 4 calories each per gram).To learn more about : Glucose
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Describe the structure of solid potassium iodide.
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Answer:
Potassium iodide is a metal-halide salt that has an ionic connection between the potassium cation (K+) and the iodide anion (I–). It is colorless to white and appears as cubical crystals, powder, or white granules. It has a salty, astringent flavor. This chemical is made from iodine and potassium hydroxide.
why is it necessary to run tlc in a closed container?
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Answer:
Explanation:
It is necessary to run TLC in a closed container and have the interior saturated with the solvent vapor to ensure maximum resolution between components and to prevent solvent evaporating off. If the solvent evaporates off, the Rf value would be lower than the expected value.
14. An atom has 10 protons, 8 electrons, and 7 neutrons. What is the charge of the
atom and what type of ion is it?
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The charge on an atom = # of protons - # of electrons
= 10 - 8
= +2
∴ the atom is a CATION (ion) of +2 charge.