Answers
Answer:
A. 8.8 g.
B. 5.3 g.
C. 449 g.
Explanation:
A. Determination of the mass of CO2.
Mole of CO2 = 0.2 mole
Molar mass of CO2 = 12 + (2×16)
= 12 + 32
= 44 g/mol
Mass of CO2 =?
Mole = mass /Molar mass
0.2 = mass of CO2 /44
Cross multiply
Mass of CO2 = 0.2 × 44
Mass of CO2 = 8.8 g
B. Determination of the mass of Na2CO3.
Mole of Na2CO3 = 0.05 mole
Molar mass of Na2CO3 = (2×23) + 12 + (3×16)
= 46 + 12 + 48
= 106 g/mol
Mass of Na2CO3 =?
Mole = mass /Molar mass
0.05 = mass of Na2CO3 /106
Cross multiply
Mass of Na2CO3 = 0.05 × 106
Mass of Na2CO3 = 5.3 g
C. Determination of the mass of Fe(OH)2.
Mole of Fe(OH)2 = 5 moles
Molar mass of Fe(OH)2 = 55.8 + 2(16 + 1)
= 55.8 + 2(17)
= 55.8 + 34
= 89.8 g/mol
Mass of Fe(OH)2 =?
Mole = mass /Molar mass
5 = mass of Fe(OH)2/89.8
Cross multiply
Mass of Fe(OH)2 = 5 × 89.9
Mass of Fe(OH)2 = 449 g.
Related Questions
Gases deviate from tidal gas behavior because their particles:
Answers
Answer:
Explanation:
At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.
The kinetic theory assumes that gas particles occupy a negligible fraction of the total volume of the gas. It also assumes that the force of attraction between gas molecules is zero.
I hoped I helped you! :)
Select the option(s) that apply to the item listed: Sugar. *
element
compound
both
Answers
Answer:
Sugar is a element
Explanation:
is nonflammable a physical or chemical property
Answers
The change of one type of matter into another type (or the inability to change) is a chemical property. Examples of chemical properties include flammability, toxicity, acidity, reactivity (many types), and heat of combustion.
The teacher was not in the room yet. Randy began opening containers of chemicals, touching them with his hands. His cheek itches so he rubbed it. Explain how Randy was not acting safety in the the laboratory.
I know the answer I just don’t know how to word it. Please help. Due by 11:59 tonight
Answers
Answer:
Randy went into the classroom without the teacher being present. He opened containers of chemicals without the teacher's consent. Randy is making contact with the chemicals on his skin.
I hope this helps! I haven't done lab science in a while so I'm trying to remember the safety precautions.
Randy went into the classroom without the teacher being present and opened containers of chemical, making contact with chemicals on skin leads to skin reaction.
So Randy should follow the lab safety rules while entering into lab.
What are the important lab safety rules?After entering lab wear apron and gloves along with safety goggles if working with any hazardous or infectious substance.
Fully aware about the hazards of the materials, properly trained to handle lab equipment, chemicals should be adequately labelled.
Taste or smell chemicals are prohibited, never pour already stored chemicals, chemical hygiene plan should be developed for specific hazards.
Avoid to adopt un-tested and unauthorized experimentation, Clean up all chemical spill, Laboratory induction should be carried out .
Avoid storage of any edible items in the refrigerator along with lab chemicals and specimens, clean the work station after completing experiment and sterilization should be done before starting experiment.
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Electrons are in regions around the nucleus called energy levels. The first
energy level
Answers
Answer:
can only accommodate 2 electrons
What happens when a Bose-Einstein condensate forms?
A. A large atom is split into many smaller atoms temporarily.
B. The atoms of the solid condense into one large superatom.
C. It causes all matter touching it to condense into a liquid.
D. The electrons separate from the nuclei forming a mass of unbound positive and negative charges.
Answers
Answer:
the answer would be B
Explanation:
The atoms of the solid condense into one large superatom. Hence, option B is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
Bose-Einstein condensation occurs at a temperature very close to absolute zero i.e 273.15 degrees centigrade. Under such conditions, a large quantity of Boson occupies the lowest quantum state, at which point microscopic quantum phenomena become apparent macroscopically. A BEC is formed by cooling a gas of extremely low density about one hundred thousandth the density of normal air, to ultra-low temperature.
Hence, option B is correct.
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25 PTS!
11. The metric prefix for 1/1000 is:
a) centi
b) milli
c) micro
d) kilo
Answers
is magnesium a pure substance????
Answers
There are a equal number of protons and electeons in natural atoms True or false
Answers
Answer:
false
Explanation:
There are a equal number of protons and electrons in neutral atoms.
please, please, please help! this assignment is due in a few mins and idk what to do. I will mark the first/best answer brainliest! Why do substances exist as a solid, a liquid, or a gas?
Answers
Answer:
Explanation:
The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid
Do you find the cell membrane in Animal Cells, Plant Cells or Both?
Answers
Answer:Both have cell membranes
both. Both plants and animals have cell membranes
Which of the following statements are not scientific hypotheses?
•Santa Claus exists.
The growth of corn in lowa depends on the amount of rain that falls.
•Theft is immoral.
•The bark of a specific tree is poisonous to mice
Answers
Answer:
.
Explanation:
What is a particle with one positive charge called?
Answers
Answer:
Proton: A positively charged particle found in the nucleus of an atom. A proton contributes one atomic mass unit to the total atomic weight of an atom.
Explanation:
Answer:
A proton
Explanation:
A proton is a positive charge found in an atom
What words do we use to talk about a column of the periodic table? (2 CORRECT ANSWERS) Period Group Family Atom Nucleus
Answers
When talking about a column of the periodic table the word we use is (B). Group
Meaning of a group in a periodic tableA group in a periodic table is a column in the periodic table of chemical elements.
In a group, all the chemical elements have similar properties which include; atoms of the same vacancy in valence and valence electron.
Groups have similar physical and chemical properties.
Groups in a periodic table are numbered from number 1 to number 8, and it is numbered from the left to the right side of the periodic table.
In conclusion, When talking about a column of the periodic table the word we use is Group
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If some paper and/or paper-like materials ignite and cause a very small fire at your lab table, you should?
Answers
Answer:
Tell your instructor immediately
True or false: Only liquids can be described as fluids. I NEEED HELPP NOWWW
Answers
Answer:
Explanation:
no, as it can also be used to describe a gas- a fluid includes liquids, gases and plasms
any matter that does not have a definite shape or a definite volume is an
Answers
pls help!! What volume is represented by each small tick mark? (look at attachment)
Answers
The mark represents a volume of 25ml.
What is a measuring cylinder?A Measuring cylinder, a graduated cylinder, a cylinder measuring, or a mixing cylinder is a part of various laboratory materials that are used for the measurement of the volume of liquids, chemicals, or solutions during laboratory work.
Graduated cylinders have more precise and accurate measurements than the common volumetric flasks and beakers used in the laboratory. These are of various volumes ranging from small to big.
These graduated cylinders are also used for the determination of displacement. It is a measurement of the change in a volume of water when some additional materials are added to it.
This means that a graduated cylinder can be used for the determination of solid materials by taking the difference between the initial volume of water and the new volume of water.
Therefore, in this case, the mark represents a volume of 25ml.
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Potassium, K, had 19 protons, 20 protons, 19 electrons. What is the charge of the atom’s nucleus.
HELP
Answers
Answer:
+ 19
Explanation:
The following data were obtained from the question:
Proton = 19
Neutron = 20
Electron = 19
Charge on nucleus =.?
From a background understanding of the structure of an atom, the nucleus of an atom contains protons and neutrons with the proton being positively charged and the neutron is neutral while the electrons being negatively charged revolve around the nucleus.
From the above question, we understood that the potassium atom has 19 protons which are all positively charged. This simply means that the nucleus has a charge of + 19 since the neutrons are neutral.
the following statement is an example of "if i post a image on Instagram at 7:00 pm, then ill get the most likes a. hypothesis b. problem c. experiment d. independent variable
I NEED HELP NOW PLEASE HELP ME AS FAST AS U CAN!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
Answer:
a
Explanation:
The given statement if i post a image on social media at 7:00 pm, then ill get the most likes is a hypothesis.
What is hypothesis?
Hypothesis can be defined as an assumption which is made for the sake of argument . It is an interpretation of a practical condition for which action needs to be taken.It is defined as a tentative assumption which is made to test logical consequences.It is an antecedent clause of a statement which is conditional.
It is constructed before research. There are six types of hypothesis 1)simple hypothesis 2) complex hypothesis 3) directional hypothesis 4)non-directional hypothesis 5) null hypothesis 6)casual hypothesis
The hypothesis should be clear and precise, it must be specific and way of explanation of hypothesis should be simple.
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Please answer this question, I will give brainliest! You fill a 2.0 L metal thermos with gas at room temperature (25.0 ˚C) and 1.0 atm. Put it in the freezer and the temperature drops to -15.0 ˚C. A. What is the pressure inside the thermos after it cools, in atm? Justify your answer. B. . … and what is that pressure in mmHg?
Answers
e temperature of a 0.750 L gas sample at 25°C and 2.00 atm is changed to 250°C.
2. Which set of symbols represents isotopes of the same element?
Set 2
Set 1
80
м
38
133
81
M
38
83
M
38
132
Q
55
Q
133
Q
54
55
Set 4
Set 3
50
L
19
50
L
20
50
L
21
91
J
43
92
J
42
93
J
42
Answers
The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.
The isotopes are the elements with same atomic number, but different mass number. In an isotope [tex]\rm ^a_bX[/tex], a has been the atomic mass, and b has been the atomic number.
The isotopes will have same value for b, while different values for a.
In the following given sets:
A. 50/19 L 50/20 L 50/21 L
It has same number of mass the atomic number has been different. Thus, the set not represents isotopes.
B. 138/59 Q 133/55 Q 133/54 Q
The given elements, has different atomic number, and different mass number. Thus the set did not represents the isotopes.
C. 91/42 J 92/42 J 93/40 J
The given elements, has different atomic number, and different mass number.Thus the set did not represents the isotopes.
D. 84/38 M 86/38 M 87/38 M
The given set has same atomic number with different mass number.Thus, the set has been the representation of isotopes.
The set of symbols that represents isotopes has been 84/38 M 86/38 M 87/38 M. Thus, option D is correct.
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Which of the following is an example of a chemical property?
o corrosion
o boiling point
o ability to dissolve
o melting point
Answers
Answer:
Corrosion is your answer
Answer:
▷The answer would be
▶︎corrosion
Explanation:
~corrosion~ is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials by chemical and/or electrochemical reaction with their environment
✦plz mark me as brainliest☑︎
✭i only need 3 more brainliest then my lvl will go upp
Which ion has a charge of 2-?
Ion A: 8 Protons,10 Neutrons,10 Electrons
Ion E:9 Protons,10 Neutrons,10 Electrons
Ion G:11 Protons,12 Neutrons,10 Electrons
Ion J:12 Protons,12 Neutrons,10 Electrobs
Answers
Answer:
A
Explanation:
More electrons than protons, thus giving the atom an overall charge of -2
List the two factors used to calculate force ? (20 pionts)
Answers
Answer:The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other.
Explanation: i hope it answers your question
Answer:
blah blah blah
Explanation:
Concrete is made of an uneven mixture of gravel, sand, and water. It is _____. homogenous heterogeneous a solution a solute
Answers
heterogeneous, because it does not have a uniform texture
hope That helps
Answer:
Heterogenous, I just took the quiz
Explanation:
What is the electron configuration for an atom of tin in the ground state?
Answers
Answer:
The ground state electron configuration of ground state gaseous neutral tin is [Kr]. 4d10. 5s2. 5p2 and the term symbol is 3P0.
What characteristic of an epic hero does this passage
show?
the ability to embark on a long journey
the ability to receive help from a supernatural force
the ability to speak with confidence
Answers
The ability to speak with confidence shows the characteristic of an epic hero does this passage show. Option C is correct.
What is confidence?
The feeling or emotion or belief that one or a person can have faith in or trust on someone or for something that he or she is doing or about to do and the hero are the inspiration for the society.
In other words a feeling or emotion of self-assurance or self believe arising or rises from an appreciation or motivation of one's own abilities or qualities or performance.
Therefore, ability to speak with confidence shows the characteristic of an epic hero does this passage show. Option C is correct.
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Answer:
B
Explanation:
Cuz
2. Jessica did an investigation about the states of matter. As part of the
investigation, Jessica wanted to change a liquid into a solid. What must she do to
bring about this change in state?
Answers
Jessica had to freeze liquid into solid.
What is the matter?
The matter is anything that occupies space. There are three states of matter: Solid, liquid, and gas.
The process in which a solid turned into liquid is called melting. When the liquid turns into solid is called freezing. The temperature of freezing liquid remains constant. The factors which affect the freezing point of object:
If the intermolecular force of molecules are relatively strong, the freezing point of object will be relatively high.If the intermolecular force of molecules are relatively weak, the freezing point of object will be relatively low.When water turns into ice that process is called freezing. When water turns into water vapor is called boiling. When gas turns into a solid that process is called condensation.
Therefore, Jessica had to freeze liquid into solid.
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What happens when aluminum fills its valence shell? A. Three electrons are gained, creating Al−3. B. Three electrons are gained, creating Al+3. C. Three electrons are lost, creating Al−3. D. Three electrons are lost, creating Al+3.
Answers
Answer:
B
Explanation:
Answer:
its D I just took the test
Explanation: