Please select the word from the list that best fits the definition
Occurs when an axon releases chemicals that allow a signal to jump across synapses between neurons
Answers
Answer:
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. Neurotransmitters bind to the membrane of the dendrite.Explanation:
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what is the balanced equation of magnesium carbonate decomposes on heating to form magnesium oxide and carbon dioxide
Answers
Answer:
ExplaAt high temperatures MgCO3 decomposes to magnesium oxide and carbon dioxide. This process is important in the production of magnesium oxide. This process is called calcining: MgCO3 → MgO + CO2 (ΔH = +118 kJ/mol)
nation:
How many mL of 0.013 M potassium hydroxide are required to reach the equivalence point in the titration of 75 mL 0.166 M hydrocyanic acid?
Answers
Answer:
957.7mL
Explanation:
Using the formula below;
CaVa = CbVb
Where;
Ca = concentration of acid (M)
Va = volume of acid (mL)
Cb = concentration of base (M)
Vb = volume of base (mL)
According to the information provided in this question:
Ca = 0.166 M
Cb = 0.013 M
Va = 75mL
Vb = ?
Using CaVa = CbVb
0.166 × 75 = 0.013 × Vb
12.45 = 0.013Vb
Vb =12.45/0.013
Vb = 957.7mL
sulfur and oxygen can react to form both sulfur dioxide and sulfur trioxide in sulfur dioxide there are 32.06 grams of sulfur and 32 grams of oxygen in sulfur dioxide there are 32.06 grams of sulfur are combined with 48 grams of oxygen
a. what is the ratio of the weights of oxygen that combine with 32.06 g of sulfur ?
b. How do these data illustrate the law of multiple proportions?
Answers
Answer:
Explanation:
In sulfur dioxide there are 32.06 grams of sulfur and 32 grams of oxygen .
In sulfur trioxide there are 32.06 grams of sulfur are combined with 48 grams of oxygen.
The ratio of oxygen which reacts with 32.06 gram of sulfur is 32: 48 .
This ratio is equal to 2 : 3.
This is in accordance with law of multiple proportion because , the ratio of mass of oxygen which reacts with constant mass of sulfur is integral ratio . Hence they are in accordance with law of multiple proportions.
Answer:
sulfur and oxygen can react to form both sulfur dioxide and sulfur trioxide in sulfur dioxide there are 32.06 grams of sulfur and 32 grams of oxygen in sulfur dioxide there are 32.06 grams of sulfur are combined with 48 grams of oxygen
a. what is the ratio of the weights of oxygen that combine with 32.06 g of sulfur?
b. How do these data illustrate the law of multiple proportions?
Explanation:
In sulfur dioxide ([tex]SO_2[/tex])
32.06 g of sulfur reacts with 32.0 g of oxygen.
In sulfur trioxide ([tex](SO_3)[/tex] 32.0 g of sulfur reacts with 48.0 g of oxygen.
So, both th ecom[pounds are made from sulfur and oxygen,
But the amount of oxygen reacts with fixed amount of sulfur that is 32.06 g and it is in proportions that is:
32.0 g : 48.0 g
=2:3.
Hence, the ratio of oxygen combines with sulfur is in the ratio of 2:3.
b.
This data illustrates the law of multiple proportions.
Because the oxygen which is combining with fixed amount of sulfur is in proportions.
Which of the following is true of a reaction with a negative enthalpy?
O A. The enthalpy of the reactants is greater than that of the products.
B. The reaction has a negative activation energy.
C. The enthalpies of the products and reactants are both negative.
D. The enthalpy of the reactants is less than that of the products.
Answers
Answer: The statement enthalpy of the reactants is greater than that of the products is true of a reaction with a negative enthalpy.
Explanation:
A chemical reaction where energy is being released is called an exothermic reaction.
In an exothermic reaction, the value of enthalpy of reaction is negative in nature.
Also, heat is being released which means the reactants has more energy than the products due to which the value of enthalpy is negative.
Thus, we can conclude that the statement enthalpy of the reactants is greater than that of the products is true of a reaction with a negative enthalpy.
Answer:
A
Explanation:
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What are some properties that can be used to determine a chemical reaction has occurred?
Answers
Answer:
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
Answer:
Change in Color
Heat is released (bubbles in solution)
Sometimes even a change in texture
A new smell
Formation of a precipitate
In the chemical reaction between aqueous magnesium chloride and sodium metal, what chemical amount (mol) of magnesium metal can be precipitated (produced) with 12.6 mol of sodium metal?
Answers
Answer:
6.3moles
Explanation:
The balanced equation of the reaction described above between aqueous magnesium chloride and sodium metal is as follows:
MgCl2(aq) + 2Na(s) → 2NaCl(aq) + Mg(s)
From the above equation, 2 moles of sodium metal (Na) produces 1 mole of Magnesium metal (Mg)
Hence, 12.6 mol of Na will produce (12.6/2) mol of Mg.
12.6/2 = 6.3moles of Mg metal.
Some factories that burn coal produce smoke with harmful chemicals,
such as sulfur. Scrubbers are devices that are attached to the
smokestacks to reduce the amount of sulfur put into the atmosphere. To
evaluate the effectiveness of these devices, what data would need to be
collected?
Answers
Answer :
The amount of sulfur emitted by a smokestack before and after the scrubber is attached
The amount of sulfur emitted by a smokestack before and after the scrubber is attached.
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Formulating an Investigative Question In this experiment, you will use a track and a toy car to explore the concept of movement. You will measure the time it takes the car to travel certain distances, and then complete some calculations. In the space below, write a scientific question that you will answer by doing this experiment.
Answers
Answer:
A scientific question to be asked is; What is the average speed of the toy car?
Explanation:
A scientific question is a question which is well defined, the values in the question can be measured, and the inputs and outputs related to the question are controllable
The parameters measured in the experiment are;
The time elapsed during the movement of the car, Δt
The distance the car moves, d
From the obtained measurements, the value can be calculated is the average speed of the toy car as follows;
[tex]The \ average \ speed \ of \ the \ toy \ car, \ v_{avg} = \dfrac{d}{\Delta t}[/tex]
Therefore, a scientific question to be asked that will be answered by doing the experiment is; What is the average speed of the toy car?
Answer:
Sample Response: How can we change the speed of a toy car on a racetrack to describe the car’s motion?
What did you include in your question? Check all that apply.
a focus on describing the toy car’s motion
a suggestion for a way to change the car’s motion
room for observations and an opportunity to look at motion objective
Explanation:
Chất được chia làm bao nhiêu loại? Lấy ví dụ cho từng loại.
Answers
Đơn chất: Cu, Cu2+,...
Hợp chất: CuO, CuCl2,...
State the method you will use to separate the following substances. (a) calcium carbonate from table salt (b) iodine from sodium chloride (c) table salt from seawater (d) sugar from sugar solution (e) pure water from sewage water (f) ethanol from beer (g) yellow dye from durian ice cream
Answers
Answer:
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Answer: There are many forms of table salt: coarse salt, refined salt, iodized salt. It is a crystalline solid, white to very pale pink or gray in color, obtained from seawater or salt deposits. Salt obtained from seawater has crystals that are smaller or larger than rock salt. In nature, table salt consists mainly of sodium chloride (NaCl), but also a few other minerals (trace minerals). Table salt obtained from rock salt may appear more gray because of traces of trace minerals. Table salt is necessary for the survival of all living organisms, including humans. Table salt is involved in regulating the body's water content (liquid balance).
The number of molecules in 17.9 g of CO is
Answers
Answer:
3.85 × 10²³ molecules CO
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableCompoundsMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify
[Given] 17.9 g CO
[Solve] molecules CO
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of C: 12.01 g/mol
[PT] Molar Mass of O: 16.00 g/mol
Molar Mass of CO: 12.01 + 16.00 = 28.01 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 17.9 \ g \ CO(\frac{1 \ mol \ CO}{28.01 \ g \ CO})(\frac{6.022 \cdot 10^{23} \ molecules \ CO}{1 \ mol \ CO})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 3.8484 \cdot 10^{23} \ molecules \ CO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
3.8484 × 10²³ molecules CO ≈ 3.85 × 10²³ molecules CO
Write the four quantum numbers of the outermost two electrons in the atom of calcium
Answers
Answer:
Its electron configuration is: 2 electrons in the K shell (principal quantum number 1), 8 in the L shell (principal quantum number 2), 8 in the M shell (principal quantum number 3), and 2 in the N shell (principal quantum number 4).
Explanation:
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Chemical bonding may involve any of the following except the
1. change in mass in a chemical reaction
2. unequal sharing of a pair of electrons between two nonmetals
3. electrostatic attraction between two ions
4. transfer of an electron from one atom to another
Answers
Answer:
Number 1 is wrong it doesn't change the mass
Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".
What is chemical reaction?A chemical reaction is referred to as a process which it involves the chemical change of one set of chemical compounds into yet another set of chemical substances.
What is chemical bonding?A molecule and compound's atoms, ions, and groups of atoms are held together by an attractive force, referred as chemical bond.
Chemical bonding may involve any of the following except the " change in mass in a chemical reaction".
Therefore, the correct answer will be option 1.
To know more about chemical bond and chemical reaction.
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Identify which of the following statements about the isotopes of an element is correct.
A. They have the same electron configuration.
B. They have the same mass number.
C. They have the same numbers of protons and neutrons in the nucleus.
D. They have more protons than neutrons.
Answers
Answer:
A
Explanation:
because B is wrong as it doesn't have the same mass number. C is wrong as it has different number of neutrons. D is wrong as it has more neutrons than protons.
Discuss the phenomena of sunrise and sunset seen on Earth and describe how they will be different from the perspective of outer space. PLS REPLY ASAP AND EXPLAIN IM DESPEPERATE
Answers
Answer:
IM TO LATE SORRY
Explanation:
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Q1: Give the letter of a substance that is a solid at 20 °C
Q2: Give the letter of a substance that is a liquid at 50 °C
Answers
Answer:
A1: Z
A2: Y
Explanation:
Q1: Z is the only one with a melting point high than 20 °C.
Q2: Y is the only substance with both a melting point lower than 50 °C and a boiling point higher than 50°C
Are neutralization reactions always exothermic ?
Answers
:]
Explanation:
Neutralisation reactions are not always exothermic. ... When an acid is neutralised by an alkali the reaction is exothermic.SInce strong acids and strong bases are completely dissociated in solution, no formal bonds are being broken. The formation of two very strong covalent bonds between hydrogen and the hydroxide ion is responsible for the neutralization reaction's exothermic character.
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stay safe healthy and happy...Boyle's Law Problems
Charles' Law Problems
Answers
Answer:
here are the answers babe. Feel free to ask for more
Write a letter to someone who had bullied you in the past,
Answers
Answer:
frick u beotch
Explanation:
Write a report on the implications of entropy to a Christian 500 words
Answers
The Bible provides an answer. A great amount of energy had to be expended to produce such great organization. As one scientist states the problem, energy was not enough. If you are asked to "reduce the entropy" of your room (put it in order), you certainly need to put in some effort (energy). But just adding energy is not enough. You could let loose a bull in your room, and it would expend a great deal of energy; however, that energy would not decrease but would increase the disorder of the room. Therefore, scientists know that to produce order, energy must be intelligently directed. Evolution requires that atoms and molecules assemble themselves into increasing order, but the science of thermodynamics assures us that the entire universe, when left to itself, is converting to disorder. The Apostle Paul referred to this concept when he said through inspiration that the entire earth is "subject to the bondage of decay." The original state required an intelligence to organize the complexities of the universe.
Christians, of course, have an answer to these perplexing questions: God. God is the Creator of the universe, the ultimate source of its energy and order. He created it with no entropy (no disorder). When man sinned, the universe began to increase in entropy (become more and more disordered). For Christians a discussion of energy, thermodynamics, and entropy is inspiring. These subjects invariably point us to the One who created the universe and sustains it by His power. Christians also know that His power will one day totally renew the universe and entropy will have no part in it.
Christians need never be afraid of science. God is in control of the universe and all the laws of the universe operate according to His will and design. Christians should be confident that they have the answers to the perplexing questions of nature.
Part 2
The above attitude allows christians to ignore questions that are difficult and this leads to mental complacency.
"This is gods work. I must not question or touch this". Is their motto.
When christians see difficult questions, such as entropy and creation, that is where they stop thinking and attribute it to god. They become intellectually crippled and refuse to make that one further step. It then halts progress until the shamen can integrate new knowledge into their mantra and dogma.
Science in general, tries to explain and understand and make further progress and additions to human knowledge. Christians will only try to understand what they have been taught and integrate any new knowledge when the older beliefs become untenable.
E. Give reasons
1. Oxygen is a diatomic element.
3. The valency of sodium is one.
F. Differentiate between
1. electrovalent bond and covalent bond
2. acidic radical and basic radical
Answers
Answer:
the valency of sodium is one because sodium loses 1 electron to become stable
calculate the volume of 150 kg of chlorine gas.
Answers
as+at+room+temperature+and+pressure
Calculate the volume of 150kg of chlorine gas at room ... Calculate the volume of 150kg of chlorine gas at room temperature and pressure. The volume of one mole of gas at room temperature and pressure is 24.0dm^3. Relative formula mass
Answer:
[tex]{ \tt{at \: \: s.t.p : }} \\ { \bf{0.0355 \: kg \: of \: chlorine \: occupies \: 22.4 \: {dm}^{3} }} \\ { \bf{150 \: kg \: will \: occupy \: ( \frac{150 \times 22.4}{0.0355} )}} \: dm {}^{3} \\ \\ { \tt{ volume = 94647.88 \: {dm}^{3} }}[/tex]
What type of reaction is shown below?
H202 + H2O + O2
Single replacement
Combustion
Synthesis
Decomposition
Answers
Answer:
Decomposition Reaction
Methane is the chief constituent of petroleum fuel
A:yes
B:no
Answers
Methane also is the chief constituent of natural gas, which contains from 50 to 90 percent methane (depending on the source), and occurs as a component of firedamp (flammable gas) along coal seams.
what is the formula for potassium sulfate
Answers
What is the formula for potassium sulfate?
[tex]\implies {\blue {\boxed {\boxed {\purple {\sf { K_{2} SO_{4} }}}}}}[/tex]
[tex]\circ \: \: { \underline{ \boxed{ \sf{ \color{green}{Happy\:learning.}}}}}∘[/tex]
Give the full fome of PET
Answers
Answer:
The full form of PET is Polyethylene Terephthalate.
Which best describes an alpha particle that is emitted during nuclear decay?
A. A helium nucleus
B. A hydrogen nucleus
C. An electron
D. A positron
Answers
Answer:
A helium nucleus
Thre types of radiation
Alpha: Helium nucleus
Beta: Electron
Gamma: Gamma rays
What is the structure of an amino acid? A. Amino group, phosphate group, pentose sugar, nitrogen base B.Amino group, R group, carboxylic acid group C. Amino group, disulfide group. R group D. Phosphate group, pentose sugar, nitrogen base
Answers
Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure , which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.
Amino group, R group, and the carboxylic acid group. Hence, option B is correct.
What are Amino acids?Amino acids are the monomers that makeup proteins.
Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom.
Hence, option B is correct.
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NO2 + H2O =
SO2 + H2O =
H2S + H2O=
Answers
SO2+ H2O=H2SO3
H2S+ H2O=H2SO4 +H2
NO2+ H2O= HNO3+NO
All samples of a specific substanice have the same chemical
composition
TRUE
FALSE
Answers
Answer:
true
Explanation: