Answers
Related Questions
Ethyl alcohol evaporates faster then water, why?
Answers
Answer:
because it melting point is low
Answer:
Alcohol evaporates because of its vapor pressure and therefore, its molecule lying at the surface of alcohol (liquid-gas boundary) breaks its hydrogen bonding and tends to escape out of the alcohol solution. It should be noted that alcohol evaporates at a faster rate than water.
What type of atoms form ionic bonds
Answers
Answer:
onic bonds usually occur between metal and nonmetal ions. For example, sodium (Na), a metal, and chloride (Cl), a nonmetal, form an ionic bond to make NaCl. In a covalent bond, the atoms bond by sharing electrons. Covalent bonds usually occur between nonmetals.
Explanation:
In the give question, ionic bonds are formed between metals and nonmetals.
An ionic bond is a type of chemical bond that involves the transfer of electrons from one atom to another.
Metals tend to lose electrons easily, while nonmetals tend to gain electrons easily. So, ionic bonds are typically formed between metals and nonmetals.
For example: Table salt (NaCl)
It is formed when sodium (Na), a metal, loses an electron to chlorine (Cl), a nonmetal, which gains that electron. The resulting ions,[tex]\rm Na^+\ and \ Cl^-[/tex], are then attracted to each other, forming an ionic bond.
Therefore, metals and nonmetals combine together to form ionic bonds.
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Which statements about viruses are true? Select all that apply.
Viruses can be seen with a compound light microscope.
Viruses vary greatly in size and structure.
Some viruses contain RNA instead of DNA.
Some viruses use the cell's machinery to replicate more viruses.
Plant viruses can infect animals if ingested.
Bacteriophages are viruses that infect bacteria, plants, and animals.
Answers
Answer:
Viruses can be seen with a compound light microscope.
Viruses vary greatly in size and structure
Some viruses use the cell's machinery to replicate more viruses
Explanation:
Sodium is a metal that explodes in water, while chlorine is a poisonous gas. When combined, however, they make edible table salt. Why?
Group of answer choices
1) When atoms bond they undergo a chemical change, which changes their physical properties.
2) Two negatives make a positive
3) Salt is actually still poisonous, because of the chlorine in it.
4) The sodium and the chlorine have undergone a physical change, into a solid. The solid part is edible.
Answers
Answer:
Option B
Explanation:
While adding salts to water is a pretty safe chemical reaction, in its elemental state, each component can be highly reactive. Sodium and chlorine both react violently with water, but are stable when their ions are together in a salt.
Oxygen has 6 valence electrons, hydrogen has just one. Elements want to gain or lose electrons to complete their valence shells of eight electrons. How many atoms of hydrogen does a single atom of oxygen want to bond with? What is the name of this compound?
Answers
Answer:
water
Explanation:
Oxygen has 6 valence electrons, hydrogen has just one. Elements want to gain or lose electrons to complete their valence shells of eight electrons.
When oxygen combine with hydrogen it needed two electrons to complete the octet that's why two hydrogen atoms are combine with one atom of oxygen.
2H₂ + O₂ → 2H₂O
Both share the electron and form covalent bond because electrons are not equally share.
Covalent bond:
It is formed by the sharing of electron pair between bonded atoms.
The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.
For example:
In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.
In Chromium-53, the "53" represents the
Answers
Answer:
The differemt isotopes that differ in atomic mass
Explanation:
MULTIPLE CHOICE
A student added phenolphthalein to two solutions. Solution A remained clear while Solution B
turned pink. Which of the following could be the pH of Solution B?
Answers
The pH of the solution B will be 10.
• One of the indicators that helps the chemists to determine visually that whether the substance is an acid or a base is the phenolphthalein.
• The phenolphthalein changes color due to ionization, and this changes the shape of the molecules of phenolphthalein.
• Naturally, phenolphthalein is colorless, however, it turns pink in alkaline solutions.
• The solution turns pink at the pH ranging between 8.2-10.
• Phenolphthalein has two distinct compositions based on whether it is an acid (colorless) or alkali (pink) solution.
Thus, turning of solution B to pink color by adding phenolphthalein indicator shows that the pH of the solution would be 10 based on the given options.
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Please help me due in like 2 min
A model of the water cycle was made by adding a small amount of water into an aquarium, covering the aquarium with a piece of glass, and placing a lamp over the glass cover to add heat. What does the lamp represent when comparing this model to the real-life water cycle?
Clouds
Precipitation
The ocean
The sun
Answers
Answer: D) The sun
Explanation:
Balance these equations!
1)
AIBr; +
K-
KBr +
AI
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Answer:
Instructions on balancing chemical equations:
Enter an equation of a chemical reaction and click 'Balance'. The answer will appear below
Always use the upper case for the first character in the element name and the lower case for the second character. Examples: Fe, Au, Co, Br, C, O, N, F. Compare: Co - cobalt and CO - carbon monoxide
To enter an electron into a chemical equation use {-} or e
To enter an ion specify charge after the compound in curly brackets: {+3} or {3+} or {3}.
Example: Fe{3+} + I{-} = Fe{2+} + I2
Substitute immutable groups in chemical compounds to avoid ambiguity.
For instance equation C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced,
but PhC2H5 + O2 = PhOH + CO2 + H2O will
Compound states [like (s) (aq) or (g)] are not required.
If you do not know what products are enter reagents only and click 'Balance'. In many cases a complete equation will be suggested.
Reaction stoichiometry could be computed for a balanced equation. Enter either the number of moles or weight for one of the compounds to compute the rest.
Limiting reagent can be computed for a balanced equation by entering the number of moles or weight for all reage
Explanation:
How many molecules of H2O are in 8.54 moles of H2O?
Select one:
a)5.14 * 10^24 molecules H2O
b)2.86 * 10^23 molecules H2O
c)6.02 * 10^23 molecules H2O
d)5.14 * 10^23 molecules H2O
Answers
Answer:
a)5.14 * 10^24 molecules H2O
Explanation:
8.54 moles of H2O contains 8.54 x 6.022 x 10^23 = 5.14 x 10^24 molecules of H2O.
Please help, there is a picture with the question
Answers
Answer:
Bromine
Explanation:
They are in the same collumn and elements share the most properties with those in their family
Five molecules will enter the BODY of an organism(1.Amino Acids, 2. Protein, 3. Glucose, 4. Starch, and 5. Oxygen). However, only three molecules will actually enter the CELLS. Which three molecules will enter every cell in the human body?
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What are the coefficients?
Answers
Answer:
1, 3, 2
Explanation:
1 x N2 = N2
3 x H2 = H6
2 x NH3 = N2H6
which is balanced, I believe.
how many atoms of hydrogen are in 420g sample of water
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EZ POINTS!!
Which of the following is not a mixture? lemonade fruit salad pure water cereal and milk
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Answer:
pure water that's easy hope that helps
Can somebody help me I’ve been a helping hand all day and nobody helping like does the app work or I need to delete.
Answers
I believe that #1 is the lie, but I'm not great at this subject.
is the reaction balanced?
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Answer:No there needs to be fewer red on the reactant side.
Explanation:
A metalloid has physical and chemical properties of _____________
A: metals , nonmetals
B: metals and noble gases
C: halogens and noble gas
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Answer:
Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they behave mostly as nonmetals. They can form alloys with metals. Most of their other physical properties and chemical properties are intermediate in nature.
Electron affinities generally become more favorable (more negative) as you move from left to right across a
period. However, the electron affinity for Be is less favorable than the electron affinity for Li, as shown below.
Li(g) + e + Li (9) EA = -60 kJ/mol
Be(g) + e + Be (g) EA> 0 kJ/mol
Which of the following best helps to explain why the electron affinity for Be is less favorable than the electron
affinity for Li?
Answers
Answer:
Explanation:
Be has a full 2s orbital whereas Li has a paramagnetic orbital; i.e., incomplete orbital which serves to need an electron to fill while Be does not.
The electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.
The electron affinity has been defined as the energy required to add an electron to the ground state of the atom.
The nonmetal has easily able to gain the electron and thus have low electron affinity, while metals have high electron affinity.
On moving from Li to Be there has been an addition of the electron. The electron addition in Be has been more difficult as the coming electron is shielded from the core elements strongly.
Thus, the electron affinity of Be is higher than Li, as Be has been shielded with high energy than Li.
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What are the methods of naming hydrocarbons?
Answers
Explanation:
Hey there!
Basically, we name hydrocarbon in two ways. They are;
Trival system of nomenclature: This system was used on past. They were given name knowing their sources from which hydrocarbon are obtained. On this naming we don't use scientific rules and structural values. For example; methane was named from marsh gas.IUPAC system of nomenclature: As the above method was not standard. IUPAC (International Union of pure and applied chemistry) improved the system and the started naming hydrocarbon. The IUPAC name of any compound contains two parts: root word and suffix. Example: Methane is named from root word Meth as it has one no.of carbon and suffix ane as it has single bonding.Hope it helps...
compare pure substance with mixture
Answers
Answer:
here
Explanation:
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Please help!
Avogadro's number is the number of particles in one gram of a carbon-12 atom. (2 points)
True
False
(EDIT: Answer is false, just took the test)
Answers
Answer:
false
Explanation:
Avogadro's number : the number of units in one mole: 6.022 × 1023, which is the number of atoms in 12 grams of carbon-12.
Answer:
false
Explanation:
i took the test.
What are some examples of HIGH resistance?
Options:
narrow wire, less resistors, long wire
long wire, wide wire, more resistors
long wire, narrow wire, more resistors
wide wire, short wire, less resistors
Answers
Answer:
Its long wire narrow wire more resistance
Explanation:
I took the same k12 test
Answer: it’s long wire narrow wire more resistors
Explanation: I took the same k12 test
good Luck cheating I mean using your resources
Which of the following best describes how forces affect matter?
A. Forces create matter
B. Forces hold matter together.
C. Forces conserve matter.
D. Forces keep matter warm
Answers
it is b forces hold matter together
A force is a push or pull on an object. Forces usually cannot be seen but their effects can. Nothing moves, changes speed, stops or changes direction without force. Heavier objects need more force to get them to move or change direction.
Answer:
Yup, it's B. Forces hold matter together.
Explanation:
The other user is correct. :)
How can controlling the way light bends and reflects be used to help people?
Answers
Answer:
The reflection of light serves to indirectly illuminate some things or objects and thus better visualize it from different human perspectives or different human views
Explanation:
Indirect visions through light reflections are widely used in detailed work or in areas where the field of work is small, an example of this is the dental area, where a mirror number 15 is used to be able to make the visual inspection of the mouth. , in the upper jaw by means of light reflection.
1. What causes potential energy to change within a system?
2. How does the location of an energy generation source affect the available potential energy?
Answers
Answer:
C D
Explanation:
Which is most likely a reason why most reptiles fail to give their offspring parental care after laying the eggs?
Answers
Answer:
The eggs have tough shells that provide protection until the eggs hatch.
Explanation:
They are able to walk about on their own, but they are defenseless against egg eaters. Even so, most reptile progenitors contribute no attention to their hatch-lings. In fact, most reptiles don't even take custody of their eggs. ... They may protect their nest from predators and maintain the hatch-lings move to the water.
What is the independent variable in this reaction
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Answer:
Explanation:
what wheres the answer???
Evaluate the following scenario and critically think about the following statement:
"Chemistry is like cooking"
Last night I made a large pot of soup. I added the following ingredients into a pot:
[Potatoes, green beans, onion, celery, carrots, chicken, sazon, adobo, rice]
I added some heat into this pot and let it simmer for about 30 minutes. After I finished cooking the soup, I went ahead and served myself a large portion. To my surprise, when I was eating the soup, I found that there was beef and noodles in the soup?!
1. Is this scenario possible?
2. Does this equation make sense?
[Ingredients for chicken and rice soup] yield [beef and noodle soup]
3. In chemistry, do my ingredients need to match the results?
Answers
Answer:
No
No
Yes
Explanation:
Which of the following is necessary to do a complete stoichiometric calculation? (5 points)
Add the nuclear masses of the products,
Divide the nuclear masses of the reactants,
Write the complete balanced chemical equation
Write the number of atoms in 1 mole of the product,
Answers
Answer:
Write the mole rato/Write the complete balanced chemical equation
Explanation:
there are two form of this question but only one of these answers will show up.
The stoichiometric calculations has been based on the writing of the balanced chemical equation. Thus option C is correct.
Stoichiometric calculations has been based on the chemical equation for a reaction. The stoichiometric chemical in a balanced chemical equation has helped in the calculation of the moles of the compounds involved in the chemical equation.
The complete stoichiometric calculations has been performed with the molecular mass of the compounds, and has been completed with the balanced chemical equation. Thus, option C is correct,
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