Answer:
See explanation
Explanation:
Initially, when the paper is hung over the light bulb, we observe that nothing happens at all.
As time goes on, air surrounding the lamp begins to heat up. Remember that hot air is lighter and less dense than cold air. Air surrounding the lamp which has now become hotter and less dense rises and pushes on the spiral. This causes the spiral to begin to spin.
Which is NOT a shape of epithelial cells?
A.Cuboidal
B.Columbar
C.circular
D.squamous
Colour in acid of red litmus paper
Red
Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple
I WILL MARK BRAINLIEST!!!!! !!
(picture included with one question ^^^^^^^)
Answer:
type D
balance form .b
Explanation:
Can y’all give me 5 facts about this
The radioactive isotope used in the dating of fossils thought to be less than 40,000 years old is ________________.
Fill in the blank.
Answer:
The answer is Radiocarbon
There is free rotation about the carbons of ethane but not th
of ethane. This is due to the fact that
A. the carbons in ethane are round
Balkenes do not rotate
C. the carbons in ethane are linked by double bonds
D. the carbon in ethane are smaller than those of ethane
Answer:
C. the carbons in ethene are linked by double bonds
Explanation:
The reason for the lack of free rotation about the carbons of ethene is that they are linked with with double bonds.
In single bonds afforded with the ethane compound, there is free rotation.
The double bonds confer a special restriction on the rotational potential of the bonded atoms round the carbon.
Which gas sample contains the most molecules ?
Answer:
CO2
Explanation:
(a) CO2; according to Avogadro's Hypothesis, they all contain the same number of particles, therefore, the heaviest molecule, CO2 (molar mass = 44), will have the greatest mass. (b) all the same; at the same temperature all gases have the same kinetic energy.
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Answer:
The three parts of the cell theory are as follows: (1) All living things are made up of cells, (2) Cells are the smallest units (or most basic building blocks) of life, and (3) All cells come from preexisting cells through the process of cell division. ... Today, the cell theory is considered the foundation of biology.
Explanation:
hope this help.. brainliest???
Answer:
i wanna give brailiest to the person at the top!
Explanation:
what form of heat transfer makes warm air rise?
Which pair of elements is most likely to form an ionic compound with each other?
sulfur and carbon
barium and chlorine
oxygen and fluorine
calcium and sodium
which best represents a compound?
Answer:
The one above B
Explanation:
The one above B is most represents a compound because compounds are chemically bonded and are always near each other.
Match each term with the correct description below.
1. what is a charged atom that has gained one or more electrons?
2. What substance is held together by ionic bonds?
3. What metal and nonmetal transferrers electrons?
4. What particle has electrons that are shared unequally?
5. What forms when atoms share electrons by covalent bonds?
6. What two nonmetals share electrons?
7. What charge atom that has lost one or more electrons?
8. What two or metals "pooling" electrons?
a. metallic bond
b. covalent bond
c. anion
d. ionic bond
e. molecule
f. cation
g. compound
h. polar molecule
Answer:
1. anion
2. compund
3. ionic bond
4. polar molecule
5. molecule
6. covalent bond
7. cation
8. metallic bond
Explanation:
A sample of calcium oxide (CaO) has a mass of 2.80 g. The molar mass of CaO is 56.08 g/mol. How many moles of CaO does this sample contain?
0.0499
20.0
58.9
157
Answer:
A) 0.0499
Explanation:
According to the mole concept, 2.80 g of calcium oxide sample has 0.0499 moles.
What is mole concept?
According to the mole concept,mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
As per the formula for number of moles, which is mass/molar mass
number of moles of calcium oxide is:2.80/56.08=0.0499 moles.
Hence, 2.80 g sample of calcium oxide has 0.0499 moles.
Learn more about mole concept,here:
https://brainly.com/question/12805690
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sedimentary rocks that are formed from physical/chemical process within the earth are given the general name of
Answer:
cementation
Explanation:
part of the rock cycle
The sedimentary rocks that are formed from physical/chemical process within the earth are given the general name of chemical precipitation.
What do you mean by the chemical precipitation ?Chemical precipitation is the process of turning a liquid into a solid by either making the liquid insoluble or making it very saturated.
Chemical precipitation, which starts when water moving through rock dissolves part of the minerals, creates chemical sedimentary rocks. When the water evaporates, the minerals are finally redeposited or precipitated after being moved away from their source.
A chemical compound that develops when the solution it was dissolved in, often water, evaporates and leaves the compound behind is known as a chemical precipitate.
Thus,Chemical precipitation is the process that gives rise to chemical sedimentary rocks including limestone, halite, and flint.
To learn more about the chemical precipitation, follow the link;
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Learning Task No. 3: Write a short paragraph regarding the differences between
saturated and unsaturated solutions.
Type of Solution
Explanations about the differences of
the two solutions
Saturated solution
Unsaturated solution
Answer:
See explanation
Explanation:
A saturated solution is a solution that contains just as much solute as it can normally hold at a given temperature in the presence of undissolved solute. An unsaturated solution contains less solute than it can normally hold at a given temperature. A saturated solution can not dissolve more solute whereas an unsaturated solution can comfortably dissolve more solute until it attains saturation at a specified temperature.
A candy bar has ____ energy.
A. Kinetic
B. Potential
Answer:
Potential energy
Explanation:
A candy bar has carbs, sugars, and calories which are potentially going to be used as energy in a body.
Answer:
B. Potential
Explanation:
Because the candy bar is sitting still.
7th grade help me plzzzzzz
The rate of change of position (or distance traveled) with respect to time"
Answer:
Velocity...I believe
Answer: velocity or meters per second
Explanation:
DNA bases are attached to _____.
sugar molecules
both sugar and phosphate molecules
phosphate molecule
Answer:
both sugar and phosphate molecules
Answer:
Both sugar and phosphate molecules
Explanation:
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will mark brainliest
Answer:
high melting point
Explanation:
high melting point
an example of a physical change that does not involve any changes in CHEMICAL PROPERTIES. Explain which physical properties have changed and list a chemical property which has not changed.
Answer:
Ripping a Paper
Explanation:
Physical Properties changed - The size has decreased, and the shape has changed.
Chemical property- Flammability
what is the electron configuration for lithium
Answer:
2,1
Explanation:
the electron configuration is 2s1
which statement is a scientific law
Answer:
It is b
Explanation:
WILL GIVE 20 POINTS AND MARK BRAINLIEST IF YOU ARE RIGHT!!
Fill in the next verse of the song:
I see a little silhouetto of a man ________________
What makes up an isotope’s mass number?
A.) The number of protons and neutrons
B.) The number of protons, neutrons, and electrons
C.) The number of stable isotopes of an element
Answer:
A
Explanation:
A motorcycle starts at rest and moves a distance of 460m .
If it has constant acceleration of 4m55 m/s2 what is its final velocity
Answer:
The final velocity of the motorcycle is 64.7 m/s
Note: Since the value for the acceleration of the motorcycle is not clear, it is assumed to be 4.55 m/s² in the calculation
Explanation:
Using the equation of motion that contains all the given values in the question: v² = u² + 2as
where v is final velocity; u is initial velocity; a is acceleration; s is horizontal distance
v = ?, u = 0 (since the motorcycle starts from rest), a = 4.55 m/s², s = 460 m
v² = 0² + 2 * 4.55 * 460
v² = 4186
take square root of both sides
v = 64.7 m/s
Therefore, the final velocity of the motorcycle is 64.7 m/s
How many grams of H2SO4 are needed to react with 78.86 grams of AI(NO3)3 ?
I
Answer:
53.18 grams of H₂SO₄ are needed to react with 78.86 grams of Al(NO₃)₃.
Explanation:
The balanced reaction between Al(NO₃)₃ and H₂SO₄ is:
2 Al(NO₃)₃ + 3 H₂SO₄ → Al₂(SO₄)₃ + 6 HNO₃
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reagents are required:
Al(NO₃)₃: 2 molesH₂SO₄: 3 molesBeing the molar mass of the elements:
Al: 27 g/moleN: 14 g/moleO: 16 g/moleH: 1 g/moleS: 32 g/molethen the molar mass of the reactants are:
Al(NO₃)₃: 27 g/mole + 3*(14 g/mole + 3*16 g/mole)= 213 g/moleH₂SO₄: 2*1 g/mole + 32 g/mole +4*16 g/mole= 98 g/moleThen, by reaction stoichiometry, the following reagent mass amounts are required:
Al(NO₃)₃: 2 moles* 213 g/mole= 436 g H₂SO₄: 3 moles*98 g/mole= 294 gThen you can apply the following rule of three: If by stoichiometry 436 g of Al(NO₃)₃ react with 294 g of H₂SO₄, 78.86 g of Al(NO₃)₃ with how much mass of H₂SO₄ will it react?
[tex]mass of H_{2} SO_{4} =\frac{78.86 grams of Al(NO_{3} )_{3}*294gramsofH_{2} SO_{4} }{436 grams of Al(NO_{3} )_{3}}[/tex]
mass of H₂SO₄=53.18 g
53.18 grams of H₂SO₄ are needed to react with 78.86 grams of Al(NO₃)₃.
PLEASE HELP
The Octet Rule explains why
A. Atoms form chemical bonds to create compounds
B. The electronegativity of fluorine is higher than chlorine
C. Ionic compounds have high boiling and melting points
D. Valence electrons are used in chemical bonding
E. Valence electrons are used in chemical bonding
It's not D that's all I know. Please answer with an explanation if you know.
Answer:
Explanation:
E
This is a change in an objects motion caused by an unbalanced force
Answer:
This is a change in an objects motion caused by an unbalanced force.
- Acceleration
Answer:
Pressure
Pressure is done when a force is applied to an object to course a motion
What are the two factors that can affect the current in a wire
Answer:
I know one of them is definitely material but the second one could be length or thickness....
Hope this helps
.....also I got my answer on google if you want to look it up to make sure I'm right......
