Answer:
the answer is e opinion
Answer: D
Explanation: the cell is the least complex, cells make tissues, tissues make organ, organs make organ systems, organ systems make organisms
what is A and what is b also on c
ANSWER QUICK PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
Answer:
A - 18.01
Explanation:
You add the first part of the equation, then you subtract that number by the number given from the second half of the equation.
How many moles are in 3.48 x 1023 molecules of H2SO4?
Answer:
0.578 mol H₂SO₄
Explanation:[tex]\frac{3.48 * 10^{23}H2SO4}{1}[/tex] ×[tex]\frac{1 mol H2SO4}{6.02214*10^{23}molecules H2SO4}[/tex] =0.5778 mol H₂SO₄ = 0.578mol H₂SO₄
can someone help me on this question
If a shell can hold a maximum of 32 electrons, what is the value of n?
2
3
4
5
Answer:4
Explanation:
Answer:
c.4 Just took the test!!!
Explanation:
Sleet forms from which type of precipitation?
snowflakes
ice crystals
rain droplets
snow
Answer:
Explanation:
Sleet and freezing rain occur under very similar conditions. Sleet is pellets of ice that form when snow falls into a warm layer and melts into rain. The rain then falls into a freezing layer of air that is deep enough to refreeze the raindrops into pellets.
which statement describes a benefit for fission reactions
Answer:
without fission reactions you wouldn't react, and we need to react
Explanation:
What type of chemical reaction does this equation represent?
2 Al + 3 FeO --> Al2O3 + 3 Fe
single replacement
O synthesis
combustion
O double replacement
Answer:
Single Replacement
Explanation:
Synthesis Reactions:
A + B → AB
Combustion Reactions:
CₓHₐ + O₂ → CO₂ + H₂O
Double Replacement Reactions:
AB + CD → AD + CB
Single Replacement Reactions:
A + BC → AB + C
Given RxN: 2Al + 3FeO → Al₂O₃ + 3Fe
We are replacing one element, therefore it is a single replacement reactionA student added solid calcium oxide to dilute hydrochloric acid in a beaker. The student added solid calcium carbonate to dilute hydrochloric acid in another beaker describe one difference between the two reactants
Answer:
Explanation:
1) When solid Calcium oxide is added to dilute hydrochloric acid
[tex]CaO(s)+2HCl(aq)[/tex]→[tex]CaCl2(aq)+H2O(l)[/tex]
2) When solid Calcium carbonate is added to dilute Hydrochloric acid
[tex]CaCO(s)+ HCl(aq)[/tex]→[tex]CaCl2(aq)+ H2O(l)+CO2(g)[/tex]
clearly we observe the formation of CO2 from Calcium carbonate whereas no such gas is evolved from Calcium oxide
The difference between the reaction of HCl with calcium carbonate and calcium oxide is that with calcium oxide no carbon dioxide formation takes place, while with calcium carbonate carbon dioxide formation occurs.
The dilute HCl has been the acid that reacts with the base for the formation of salt and water. The addition of calcium oxide has been the resultant of the reaction that results in the formation of calcium chloride and water. The reaction has no brisk effervescence or gas release.
The reaction of Calcium carbonate with dilute HCl results in the same reaction with the formation of calcium chloride and water. However, in the reaction, there has been the release of the bubbles of carbon- dioxide formation.
For more information about calcium carbonate, refer to the link:
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9. When the vapor pressure of a liquid is equal to the
atmospheric pressure, the liquid will
A) freeze
B) boil
C) melt
D) condense
If you heat up water and the particles begin to move faster is this an example of?
Answer:
kinetic theory of matter. when heat is added it excites the atoms and makes them vibrate.
ques-1 Write true and false for the following :-
1)tearing of paper is a physical change
2) The presence of oxygen and water is necessary for rusting of iron
3) Copper is more reactive than iron
4) A physical change can we reserved.
5) In a chemical change ,no new substance is formed
Ques-2 Complete the analogies.
1) Acetic acid:vinegar:: ...........lime water.
2) Copper sulphate : blue vitriol:: ........green vitriol
3) Physical change: ........... :: chemical change:permanent
4) Oxide of iron: .............. : : oxide of magnesium :MgO
5) Saline water: salt water :: soda water:
Which negative quality does Deborah exhibit?
Answer: Disdain
Explanation: Deborah believes that people of other nationalities are inferior to her. she treats them with disdain and does not miss an opportunity to abuse them.
Atoms are comprised of subatomic particles. Which of the following is a subatomic particle NOT found in the nucleus of an atom? O The core O Protons O Electrons 0 Neutrons
Answer:
O The core
Explanation:
Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons. Which therefore means that the core is NOT a subatomic particle.
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Select all properties that you included in your hypothesis. . . . High melting and boiling points and therefore solid at room temperature . . . A crystalline structure . . . Ability to dissolve easily in water . . . Ability to conduct electricity well
Answer:
High melting and boiling points and therefore solid at room temperature
A crystalline structure
Ability to dissolve easily in water
Ability to conduct electricity well
Explanation:
The hypothesis mentioned in the question will be something like this
'If a substance is solid at room temperature, has a crystalline structure, dissolves easily in water, and conducts electricity well, then it likely contains ionic bonds. Otherwise, it likely contains covalent bonds'
We can see that all the items selected in the answer box were included in the hypothesis.
Answer:
C, B, D
good luck on your Chem!
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According to the law of conservation of mass, how much zinc was PRODUCED by reacting Calcium and Zinc carbonate together?
Answer:
104g
Explanation:
Based on the law of conservation of mass, the quantity of zinc produced by reacting calcium and zinc carbonate would be 104g.
The law of conservation of mass states that "in a chemical system, the mass is always conserved as matter is neither created nor destroyed but changed from one form to another".
In short;
Mass of products = Mass of reactants
Mass of products = Mass of CaCO₃ + Mass of Zn
Mass of reactants = Mass of Ca + Mass of ZnCO₃
So;
152g + Mass of Zn = 64g + 192g
Mass of Zn = 64g + 192g - 152g
Mass of Zn = 104g
Answer:
104g
Explanation:
math + science = 104g
Put the elements potassium iron bromine and krypton in order of increasing electro negativity
Answer:
K < Fe < Br < Kr
Explanation:
Given chemical elements;
Potassium
Iron
Bromine
Krypton
Problem; arrange in order of increasing electronegativity
Solution:
The electronegativity of an element measures the relative tendency with which the atoms of the element attracts valence electrons in the chemical bond.
To solve this problem, we are going to use values of electronegativity from the Pauling's electronegativity table of elements;
For;
Potassium = 0.8
Iron = 1.83
Bromine = 2.8
Krypton = 3.0
So;
K < Fe < Br < Kr
A student measures the length of a magnesium ribbon three times and records the data as: (a). 23.486 cm, (b). 23.491 cm, (c). 23.511 cm, The labeled value of the magnesium ribbon is 23.490 cm. Calculate the precent error for ALL the data recorded by the student. Which has the least percentage error? (Show all work or an explanation)
Explanation:
A student measures the length of a magnesium ribbon three times and records the data as: (a). 23.486 cm, (b). 23.491 cm, (c). 23.511 cm
The labeled value of the magnesium ribbon is 23.490 cm
We need to find the precent error for all the data recorded by the student.
[tex]\text{Percentage error} = \dfrac{|\text{calculated value-actual value}|}{\text{acutal value}}\times 100[/tex]
(a) When the calculated value = 23.486 cm
[tex]\text{Percentage error} = \dfrac{23.486 -23.490 }{23.490 }\times 100\\\\=0.017\%[/tex]
(b) When the calculated value = 23.491 cm
[tex]\text{Percentage error} = \dfrac{23.491 -23.490 }{23.490 }\times 100\\\\=0.0042\%[/tex]
(c) When the calculated value = 23.511 cm
[tex]\text{Percentage error} = \dfrac{23.511 -23.490 }{23.490 }\times 100\\\\=0.0893\%[/tex]
When the calculated value is 23.486 cm, it has least error of 0.017%.
Why do you think the temperature does not change much during a phase change?
Answer: Temperature of a substance does not change during a phase change. Energy gained after the the solid melts increases the average kinetic energy or the temperature. Freezing. When liquid is freezing the energy flows out the the liquid.
Explanation:
What best explains the relationship between photosynthesis and cellular respiration? (4 points) a The higher the rate of formation of products in respiration, the lower the rate of photosynthesis. b Photosynthesis depends on the carbon dioxide released during cellular respiration. c Cellular respiration depends on the water released during photosynthesis. d They have the same set of product molecules.
Answer:
Molicules
Explanation:
Becuse it is
The molecules in straw are made up of carbon, hydrogen, and oxygen atoms. Gold is made of gold atoms. Describe why straw cannot be turned into gold. In your answer, be sure to include what you have learned about chemical reactions, atoms and molecules, and reactants and products. Be as thorough as you can as you put together everything you have learned.
Answer:
See explanation
Explanation:
First of all we must remember the statement of Dalton's atomic theory that atoms can neither be created nor destroyed. Clearly, chemical reactions involves rearrangement of atoms of reactant and product molecules.
Since straw contains carbon, hydrogen, and oxygen atoms, it is obvious that there are no gold atoms in it.
If there are no gold atoms in straw, then straw can not be converted into gold by any chemical process because that implies that gold atoms are being 'created' in violation of Dalton's theory.
Which series of words describes lengths of geologic time from shortest to longest?
era
period
eon
era
Answer:
eon,era, period
Explanation:
Answer:
period<era<eon
Explanation:
I took the test, sadly got a 70%.
The relationship between the Kelvin temperature and volume of a gas is linear until the temperature begins to approach 0 K. why?
Answer:
See explanation
Explanation:
We must remember that gases exhibit ideal gas behavior at ordinary temperature and pressure.
As the system approaches absolute zero gas laws begin to break down and the relationship linear between volume and temperature (Charles law is broken).
Recall that, at absolute zero, the volume of an ideal gas would be zero and all molecular motion stops due to the fall in temperature and kinetic energy of the molecules.
The reason for linear should be explained below.
Temperature:Since the system approaches absolute zero gas laws starts to break down and the relationship is linear between volume and temperature At absolute zero, the volume of an ideal gas should be zero and all molecular motion stops because to the fall in temperature and kinetic energy of the molecules.
Learn more about the temperature here: https://brainly.com/question/19258620
How do diffusion and osmosis differ?
Thank you
Answer:
Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. ... Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.
Which energy source did you rank as the best option for the rescue team?
1.nuclear power plant
2.combustion engine
3.hydroelectric power plant
4.solar cell
5.wind turbine
6.human-powered generator
7.fuel-burning power plant
(Please provide 2 answers and explain why u chose these options)
Answer:
Explanation:
Solar cell, Although there are many types of energy, the most efficient forms are renewable: hydro-thermal, tidal, wind, and solar. Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use.
When it comes to surviving in the wild, campers and hikers also often depend on some sort of portable backup power source. Solar energy is one of the best backup power sources for emergency situations.
Human powered generators are the best energy source for the rescue team as it doesn't require any lengthy time consuming resource but only the power of single human being. Just like fossil fuels, the human power is a kind of renewable energy source that does no harm to the environment and can be used whenever required.
MnBr4
What is the ionic compound name for this
Answer:
The most important thing to remember about ionic compounds is that they must be electrically neutral, i.e. the overall charge of a formula unit must be zero.
Ionic compounds are formed when cations, which are positively charged ions, form ionic bonds with anions, which are negatively charged ions.
The cations and anions are held together by the very powerful electrostatic force of attraction that exists between the opposite charges.
In your case, you know that the cation has a
4
+
positive charge and that the anion has a
1
−
negative charge.
In order for an ionic compound to form, you need the overall negative charge coming from the anions to balance out the overall positive charge coming from the cation.
In order to achieve that balance, you need to have four anions for every one cation, since
4
×
(
1
−
)
=
4
−
will balance out the
4
+
charge of the cation. This means that one formula unit of this ionic compound will contain one
Mn
4
+
cation and four
Br
−
anions
Mn
4
+
Br
1
−
⇒
Mn
1
Br
4
⇒
MnBr
4
As you can see, one way to remember this is that the charge of the cation becomes the subscript of the anion and vice versa - this is known as the crisscross method.
The name of the compound will be manganese(IV) bromide. The Roman numeral is used here because manganese can have multiple oxidation states.
Explanation:
mr freeze
The name of the given ionic compound [tex]\rm MnBr_4[/tex] is named manganese(IV) bromide.
Ionic compounds are chemical compounds that are formed by the electrostatic attraction between oppositely charged ions.
To determine the name of this compound, we need to follow the naming rules for ionic compounds.
The first step is to name the metal ion, which in this case is manganese. In [tex]\rm MnBr_4[/tex], the charge on the bromine ion is -1, and there are four bromine ions. Therefore, the total charge contributed by the bromine ions is -4. To balance this charge, the manganese ion must have a charge of +4. The name of the compound is then determined by combining the name of the cation (manganese) and the name of the anion (bromine), with the cation name first. Since the manganese ion has a charge of +4, it is named using the Roman numeral IV. The name of the compound is therefore manganese(IV) bromide.In conclusion, the ionic compound [tex]\rm MnBr_4[/tex] is named manganese(IV) bromide.
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Why do scientists use the International System of Units (SI)?
Answer:
So they can communicate their results without confusion.
Explanation:
ok it is amistkake[adkadkakdkadda
Answer:
is this a question or is this to just let us have free points?
Explanation:
How many mL is in ethanol when it has a mass of 3.9 g and a density of .78g/mL?
Answer:
5mL
Explanation:
mass divided by density is equal to volume so
3.9/.78 = 5
why does this work?
grams cancel when you divide g/g/mL and you are left with just mL
dimension analysis of universal gravitation constant
omg im so dumb i cant answer this question omg sorry im 302918291802832908310 years old and i cant think propertly