Answer:
See the answer below
Explanation:
The percentage by mass of a substance in a mixture is the ratio of the mass of the substance and the mass of the entire mixture.
Hence, when concentrated HNO3 is said to be 69% by mass of nitric acid, it means that the solution of the acid has 69% HNO3 and 31% water in terms of mass. More specifically, 100 g of the solution of the acid would contain 69 g of HNO3 and 31 g of water respectively,
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
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.
compare pure substance with mixture
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.
What are the coefficients?
Answer:
1, 3, 2
Explanation:
1 x N2 = N2
3 x H2 = H6
2 x NH3 = N2H6
which is balanced, I believe.
What is the independent variable in this reaction
Answer:
Explanation:
what wheres the answer???
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.
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.
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?
how many atoms of hydrogen are in 420g sample of water
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,
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,
For more information about the stoichiometric calculation, refer to the link;
https://brainly.com/question/2563006
Please help, there is a picture with the question
Answer:
Bromine
Explanation:
They are in the same collumn and elements share the most properties with those in their family
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?
Answer:
No
No
Yes
Explanation:
is the reaction balanced?
Answer:No there needs to be fewer red on the reactant side.
Explanation:
What are the methods of naming hydrocarbons?
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...
Which one sounds better "the reign of scar", or "Scar's Reign"
Answer:
i think
Explanation:
"the reign of scar" will sound better
I like "Scar's Reign". If you really like "the Reign of Scar" I suggest finding a synonym to "reign" that fits nicer. Good luck with... whatever you're doing. Hope this helps :)
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.
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:
In Chromium-53, the "53" represents the
Answer:
The differemt isotopes that differ in atomic mass
Explanation:
Which is most likely a reason why most reptiles fail to give their offspring parental care after laying the eggs?
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.
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?
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.
For more information about Electron affinity, refer to the link:
https://brainly.com/question/977718
Help me first to answer will get brainliest
What is an example of a reservoir?
(A )Beach (B )Cloud (C )Desert (D )Lake
Answer:
the answer should be Lake
Answer: D
Explanation:
please don't report me I just want to make you feel good I beg you
Answer:
this comic was pretty funny
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
Answer: D) The sun
Explanation:
If your experiment did not seem to match the expected results, what did you learn from the experience?
Answer:
i learnt that the different result that i got can be prepared through my experiment. if that result is useful for anywork or for me then i can note down my procedure and use it again to get that result . And while noting it down i will know about the mistake that i did due to which i got different result and i can do correction of it in next time.
A metalloid has physical and chemical properties of _____________
A: metals , nonmetals
B: metals and noble gases
C: halogens and noble gas
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.
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?
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.
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)
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.
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.
I believe that #1 is the lie, but I'm not great at this subject.
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?
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.
To know more about:
https://brainly.com/question/16784630
Ethyl alcohol evaporates faster then water, why?
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.
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?
Answer:
C D
Explanation:
What is the density of an object that has a mass of 500g and a volume of
10mL?
EZ POINTS!!
Which of the following is not a mixture? lemonade fruit salad pure water cereal and milk
Answer:
pure water that's easy hope that helps