Answer:
.0139
Explanation:
The number of moles of HCl would take to neutralize the sodium hydroxide produced is equal to 0.0139 moles.
What is a neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base react with each other to prepare salt and water.
When HCl reacts with NaOH and the resulting salt is sodium chloride and water.
HCl + NaOH [tex]\longrightarrow[/tex] NaCl + H₂O
The chemical reaction, chemical reaction of sodium metal and water gives hydrogen gas and sodium hydroxide:
[tex]2Na+ 2H_2O \longrightarrow 2NaOH + H_2[/tex]
Given the amount of sodium metal = 0.32 g
The moles of sodium metal = 0.32/23 = 0.0139 moles
If the 2 moles of sodium produce sodium hydroxide = 2 mol
The 0.0139 moles of sodium will produce NaOH = 0.0139
Therefore, 0.0139 moles of HCl is required to neutralize 0.0139 moles of NaOH.
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Part of the complement system of defense is opsonization. This process
causes the pathogen to become trapped in mucus.
coats the pathogen exterior so that it is recognized by the host's phagocytes.
creates an acidic environment that prevents pathogen attachment
causes holes to form in the pathogen's cell walls.
Answer:
The correct answer is coats the pathogen exterior so that it is recognized by the host's phagocytes. :)
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Please rate and mark brainliest!!!
I will mark brainlist
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
Water will move into the cell because of lower concentration of water inside the cell as compared to outside.
Why water moves inside or outside of the cell?Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.
So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.
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Answer:
If you're from study island, the answer is D. Water will move out of the cell.
Explanation:
I got it on study island and this was right.
help me my homework pls
Answer:
1. Boron B 13 2 Non-Metal
2. Aluminium Al 13 3 Metal
3. Tin Sn 14 5 Metal
4. Helium He 18 1 Non- Metal
5. Neon Ne 18 2 Non- Metal
6. Calcium Ca 2 4 Metal
7. Francium Fr 1 7 Metal
8. Gold Au 11 6 Metal
58.0 g of K2SO4 was dissolved in 500 g of water.
What is the molality of the solution? (Molar mass of
K2SO4 = 174.0 g/mol)
m
Round your answer to the nearest hundredth. Do not include units
in your answer.
Answer:
0.67
Explanation:
Molality is mols of solute over kilograms of solvent
there are 58/174 mols of solute, and 0.5 kg of solvent
(58/174)/0.5=0.6666...
Round to the nearest hundreth to get 0.67
Given that the molar mass of naoh is 40.00 g/mol, what mass of naoh is needed to make 2.500 l of a 2.000 m naoh solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.1250 g 5.000 g 32.00 g 200.0 g
The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given that, molarity of NaOH = 2M
Volume of NaOH solution = 2.5L
Moles of NaOH will be calculated by using the below equation as:
M = n/V
n = (2)(2.5) = 5 moles
Now we calculate the mass of NaOH of 5 moles as:
W = (5mol)(40g/mol) = 200g
Hence option (4) is correct.
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Answer:
d
Explanation:
Which of the following best
explains why matter changes
from one phase to another?
A. Changes in color causes matter to change
phase.
B. Changes in size causes matter to change
phase.
C. Changes in energy causes matter to change
phase.
D. Changes in volume causes matter to change
phase.
Answer:
c changes in energy causes matter to change
Explain in complete sentences why
how the oceans are fundamental to all life on Earth
Answer:
The oceans are the very foundation of human life. life itself arose from the oceans. The oceans are vast, covering about 140 million square miles, some covering 72 percent of the earth's surface.
Explanation:
what is the molar mass of sucrose C12H22O11 , needed to prepare 500 mL of a sugar solution with a concentration of 0.783 mol.
Answer:
342g/mol
Explanation:
Molar mass of carbon=12, hydrogen=1 and oxygen=16
therefore C12H22O11=12(12)+22(1)+11(16)
=144+22+176
=342g/mol
HELPPPPPPPPP!!!!....... Which statement best describes how chemical equations demonstrate conservation of mass?
A.
The number of reactants is the same as the number of products.
B.
The compounds are the same on each side of the reaction.
C.
The number of atoms of each element is the same on each side of the equation.
D.
The state of matter is the same on each side of the equation.Which details from the passage are emphasized in both the text and images?
Answer:
A. The mass of reactants is the same as the mass of products
Please, I need this now.
Drag each label to the correct location on the image.
Match each situation to the circuit diagram that represents it.
Answer: if anyone needs it <3
Explanation:
Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemical
Answer:
Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemichal
Please help me for this
Answer:
it says tick the box next to the correct answer so it'd be right to tick the last box:
The particles of the gas slow down
Potassium chlorate decomposes to form potassium chloride and oxygen according to the following
equation:
2 KCIO3(s) + 2 KCl(s) + 3 O2(g)
How many grams of oxygen are produced if 244 grams of potassium chlorate decompose and 148
grams of potassium chloride are produced?
O 1.65 g
O 0.607 g
0 96.0 g
O 392 g
Answer:
O 392 g
Explanation:
39.2 grams of oxygen (O2) can be produced.
The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.
What is stoichiometry?The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.
Here the balanced reaction is:
2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)
2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g
3 moles of O₂ = 3 × 2 × 16 = 96 g
245 g KCIO₃ produces 96 g O₂
Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g
Thus the correct option is C.
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Particles 91, 92, and q3 are in a straight line.
Particles q1 = -28.1 uc, q2 = +25.5 uc, and
q3 = -47.9 uc. Particles qi and q2 are separated
by 0.300 m. Particles q2 and q3 are separated by
0.300 m. What is the net force on q3?
Remember: Negative forces (-F) will point Left
Positive forces (+F) will point Right
The net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.
Force between particle 1 and particle 2
The force between the two particles is determined from Coulomb's law as shown below;
F = kq₁q₂/r²
F(1,2) = -(9 x 10⁹ x 28.1 x 10⁻⁶ x 25.5 x 10⁻⁶) / (0.3)²
F(1,2) = - 71.66 N
Force between particle 2 and particle 3F(2,3) = + (9 x 10⁹ x 25.5 x 10⁻⁶ x 47.9 x 10⁻⁶) / (0.3)²
F(2,3) = + 122.15 N
Net force on particle 3The net force on particle 3 is determined as follows;
F(net) = 122.15 N - 71.66 N
F(net) = + 50.5 N
Thus, the net force on particle 3 due to the presence of particle 1 and particle 2 on the same straight line is 50.5 N to the right.
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I need help with this one.
Magnesium and Calcium Oxide
Trick : Reactants are always on left
Answer:
magnesium and calcium oxide
How does a noncompetitive inhibitor decrease the rate of an enzyme-catalyzed reaction?.
Answer:
In fact, the inhibitor and substrate don't affect one another's binding to the enzyme at all. However, when the inhibitor is bound, the enzyme cannot catalyze its reaction to produce a product. Thus, noncompetitive inhibition acts by reducing the number of functional enzyme molecules that can carry out a reaction.
What are the three types of stresses that can be applied to
a system at equilibrium?
Answer:
The 3 stressers are 1. Adding or removing reactants or products. 2. Changing the total pressure or volume. 3. changing the tempature of the system.
Explanation:
All three of these are stressers that can be applied.
-Hope This Helps!
-Justin:)
giving brainliest please help!
When we react an acid with a base a neutralisation reaction occurs.
What pH do you end up with?
Explanation:
Good question!
When you react an acid with a base,the pH of the product is determined by the concentrations of the reactants (the acid and the base)
If both reactants (acid and base) are strong,the pH of the product is 7
If the acid is stronger than the base,the pH of the product will be less than 7
If the base is stronger,the pH of the product will be greater than 7
I hope this helps
It’s not a chemistry question but there is no Science Option. Pls help!
Question:
What are some ways we use greenhouse gases and how we can prevent it
2. Fe(s) + O2(g) → Fe3O4(s) a. When 13.54 g of O2 is mixed with 12.21 g of Fe, which is the limiting reactant? b. What mass in grams of iron oxide is produced? c. What mass in grams of excess reactant remains when the reaction is complete? d. A student performed completed this reaction in a lab and made15.88 g of Fe3O4, what was their percent yield?
The percent yield shows the extent to which the reactants are converetd into products . The limiting reactant is used up in the reaction.
What is a limiting reactant?A limiting reactant is the reactant that is in the least amount in the system. Now;
Number of moles of Fe = 12.21 g/56 g/mol = 0.22 moles
Number of moles of O2 = 13.54 g/32 g/mol = 0.42 moles
Balanced reaction equation;
3Fe(s) + 2 O2(g) = Fe3O4(s)
If 3 moles of Fe reacts with 2 mole of O2
0.22 moles of Fe reacts with 0.22 moles * 2 mole/3 moles = 0.15 moles
Hence, Fe is the limiting reactant
If 3 mole of Fe produces 1 mole of Fe3O4(s)
0.22 moles of O2 produces 0.22 moles * 1 mole/3 moles of Fe3O4(s) = 0.1073 moles
Mass of Fe3O4(s) =0.1073 moles * 232 g/mol =16.9 g
Number of moles of excess reactant = 0.42 moles - 0.15 moles = 0.27 moles
Mass of excess reactant = 0.27 moles * 32 g/mol = 8.64 g
percent yield = 15.88 g/16.9 g * 100/1
= 93.4%
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helpp
What also increases as the resistance in a longer wire increases?
A. Voltage
B. Charges
C. Temperature
D. Current
Equation for the hydrolysis of glyceryl triethanoate.
The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
What is Hydrolysis?Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.
Hydrolysis depend on the pH, solubility and chemical constituent of the substance.
Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
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what is the numerical value of gold silver and platinum?
Which statement is true of a mechanical wave? a It must have a medium.
b It can travel in a vacuum.
c It must travel in empty space.
d Both sound and light are examples.
Answer:
The answer is A. It must have a medium
Explanation:
With out a medium the wave will not travel at all.
-Hope This Helps!
-Justin:)
What is two masses exerting a force on each other an example of?
Kepler's law
geocentric theory
universal law of gravitation
heliocentric theory
Answer:
universal law of gravitation
Explanation:
According to Newton's law of gravitation, every particle in universe attracts every other particles with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centres!
Consider two particles having masses m1 and m2 and are apart r units, then the gravitational force acting between them is given by
[tex]F = G \cdot \frac{m1\cdot \: m2}{ {r}^{2} } [/tex]
Where G is universal gravitational constant or proportionality constant!!
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3. Which of the following sentences apply to neutrons? a. have a negative charge. b. circle around the atom nucleus. c. are the only particles that form the nucleus. d. have a mass of 1 amu. SA 2
Answer:
d.have a mass of 1 amu..
Explanation:
Does not match a as the answer for a is electrons B.electron circle around the nucleus because neutrons are inside the nucleus.C.proton and neutrons make the nucleus so the only answer left is .d .which is correct
Answer:c are the only are the only particle that form the nucleus
Explanation:
Explain 3 sources of carbon dioxide production and explain how the production of CO2 can lead to global warming.
Answer:
Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.
Explanation:
HELP FAST!! BRAINLIEST!
Boron-10 is commonly used as a control rod for nuclear reactors because it absorbs _______ and releases an alpha particle and a lithium-7 nuclide.
A. a neutron
b. a gamma ray
c. an electron
d. a protron
Your answer is A. a neutron
A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.
Answer:
A. a neutron
Explanation:
Boron-10 is commonly used as a neutron absorber due to the high neutron cross section of isotope 10B.
hope this helps!
The graph above shows the titration curve that resulted when a sample of 0.1 M monoprotic acid was titrated with a solution of NaOH. Based on the graph, the pKa of the acid is closest to
(A) 3.0
(B) 4.0
(C) 6.0
(D) 8.0
(E) 12.0
Based on the titration curve of the monoprotic acid, pKa of the monoprotic acid is closest to 8.0.
What is a titration curve of acid?A titration curve of an acid is a curve obtained from the plot of the pH against the amount of base added.
The titration curve of an acid reveals its pKa.
The pKa corresponds to the midpoint of titration when equal concentrations of the acid and base have reacted.
From the titration curve above, the pKa of the monoprotic acid is closest to 8.0.
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