Answer:
Sorry I didn't get it
Explanation:
Where is the question?
. A 60.0 g piece of Zn at 20.0 o C is dropped into 200.0 g of water at 100.0 o C. Determine the final temperature reached by the Zn and water, knowing that the specific heat capacity of Zn and water are 0.389 J/(g.o C) and 4.184 J/(g.o C), respectively.
Answer:
97.8 C
Explanation:
Recall the equation for specific heat:
q = mcΔT
There are several things to know in order to answer this question:
1. Whatever heat energy one object gains is the same as the heat energy the other has lost (conservation of energy).
2. Since one substance loses heat and the other gains heat, you need to multiply one side by -1 to account for the opposite direction of heat transfer.
3. The final temperature of both substance will be the same (zeroth law of thermodynamics)
Below, the left side of the equation represents water and the right side represents zinc.
-1 x 200 x 4.184 x (T - 100) = 60 x 0.389 x (T - 20)
Solve this equation and you get T = 97.8.
HELP ASAP!!! if 600.0 grams HF reacts with excess SiO2, how many grams of H2O are produced? Use the following molar masses: HF= 20.01g
H2O=18.02g
Show work.
Answer: The mass of water produced is 180.02 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
Given mass of HF = 600.0 g
Molar mass of HF = 20.01 g/mol
Plugging values in equation 1:
[tex]\text{Moles of HF}=\frac{600.0g}{20.01g/mol}=29.98 mol[/tex]
The given chemical equation follows:
[tex]SiO_2+6HF\rightarrow H_2SiF_6+2H_2O[/tex]
By the stoichiometry of the reaction:
If 6 moles of HF produces 2 moles of water
So, 29.98 moles of HF will produce = [tex]\frac{2}{6}\times 29.98=9.99mol[/tex] of water
Molar mass of water = 18.02 g/mol
Plugging values in equation 1:
[tex]\text{Mass of water}=(9.99mol\times 18.02g/mol)=180.02g[/tex]
Hence, the mass of water produced is 180.02 g
What is true of a Brønsted-Lowry acid?
A. A Bronsted-Lowry acid donates OHĽions.
B. A Bronsted-Lowry acid donates H+ ions.
C. A Bronsted-Lowry acid donates electrons.
D. A Bronsted-Lowry acid donates a metal
Calculate the pH of a solution that is 0.205M benzoic acid and 0.230M sodium benzoate, a salt whose anion is the conjugate base of benzoic acid. (The pKa of benzoic acid
Answer:
pH = 4.25
Explanation:
A solution composed of a weak acid and its conjugate base is a buffer solution. To calculate the pH of a buffer solution we use the Henderson-Hasselbach equation:
pH = pKa + log ([conjugate base]/[weak acid]
In this case, we have the following data:
[conjugate base] = [sodium benzoate] = 0.230 M
[weak acid] = [benzoic acid] = 0.205 M
The pKa of benzoic acid is 4.2. So, we introduce the data in the equation:
pH = 4.2 + log (0.230 M/0.205 M) = 4.2 + 0.050 = 4.25
Walking on sand with your bare feet demonstrate what kind of heat transfer
Answer:
It would be conduction.
If element R has 2 valence electron and element Q has 6 valence electrons, what is the likely compound that will form:
Explanation:
Sydney has been the work that is a great place 56 to be able and a day and day for a week or two types and we will have a very nice time of course but 6yy6667 has 7575665yy44y
Using dimensional analysis convert 238.0 cm3 to L
Answer:
= 0.238 L
Explanation:
From the given information:
To convert cm³ to L(liter), we utilize the advent of a unit fraction that comprises a liter in the upper part of the fraction(numerator) and a cubic centimeter in the lower part of the fraction(denominator)
Recall that:
1000 cm³ = 1 liter
∴
238.0 cm³ = [tex]\dfrac{238.0 \ cm^3}{1} \times \dfrac{1 \ L}{1000 \ cm^3}[/tex]
= 0.238 L
Which diagram(s) represents the bonding pattern of
metals?
O A and B
O C and D
O A
ос
Answer:
C and D- Ionic bonding
B- Metallic bond
Explanation:
They show ionic bonding through which metals bond.
B shows metallic bonding
A student repeats a reaction several times to test the effects of various
changes on the reaction rate. The data table shows the results. How does
increasing the concentration of the reactants change the reaction rate?
5
Conditions
Reaction Time (5)
10 seconds
Original
Higher concentration
Higher temperature
5 seconds
5 seconds
Metal added
5 seconds
A. Increasing the concentration has no effect on the reaction rate.
B. Increasing the concentration decreases the reaction rate.
C. Increasing the concentration increases the reaction rate.
D. More information is needed to determine what happens to the
reaction rate.
Answer:
The correct answer is - C. Increasing the concentration increases the reaction rate.
Explanation:
In the given question the data with change in different factors affect the rate of reaction differently as it alters the time it takes to complete reaction:
Conditions Reaction Time
Original 10 seconds
Higher concentration 5 seconds
Higher temperature 5 seconds
Metal added 5 seconds
As it is given above, time is decreased in each condition including in the case of increasing the concentration of the reactants which means the rate of reaction increases as well.
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Answer:
Draw a structural formula for the organic anion (i.e., do not include NH4 ) formed when propanal is reacted with Tollens reagent. Don't forget the charge on the ion.
Explanation:
Aldehydes on reaction with Tollen's reagent(ammonical silver nitrate solution) form carboxylic acids.
The anion formed is a carboxylate ion.
The entire chemical reaction is shown below:
HURRRYYY !!!!!
Which of these statements best describe how Kennedy Space Center benefits Florida? It helps to
decrease immigration in Florida.
increase unemployment in Florida.
decrease the income from sale of goods in Florida.
increase Florida's average income per person.
Answer:
The correct answer is - increase Florida's average income per person.
Explanation:
Kennedy Space Center established by NASA helped the boosting economy of Florida. Spaceport operations in Kennedy Space Center benefit Florida by a total economic impact of nearly $4 billion on Florida's economy.
This space center helped in the 7,639 jobs in 2018 and 2019 and 37 new space operation companies. These jobs increased Florida's average income per person above $91,000.
Classify each of the following elements as a metal, nonmetal, or metalloid.
Na, Ge, Si, Br, Ag
Metal
Nonmetal
Metalloid
Multiple Choice
Which statement is not part of Dalton's atomic theory?
All atoms of a given element have the same mass and other properties.
Certain groups of elements have similar properties.
Each element is composed of indestructible particles called atoms.
Atoms combine in simple whole-number ratios to form compounds.
Which of the following statements is true about the properties of protons, neutrons, and electrons?
One positive charge cancels (neutralizes) another positive charge.
One negative charge cancels (neutralizes) another negative charge.
Positive and negative charges attract.
Protons have much less mass than neutrons and electrons.
ig i i i i i i i i i ii i i i i i ii i i i i i
1. Na is metal
Ge is Metalloid
Si is Metalloid
Br is Nonmetal
Ag is Metal
2. Each element is composed of indestructible particles called atoms.
3. Positive and negative charges attract.
What is Chemistry?Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that makeup matter to the compounds composed of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.
In the scope of its subject, chemistry occupies an intermediate position between physics and biology. It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level. For example, chemistry explains aspects of plant growth (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).
Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. primary chemical bonds—e.g., covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); metallic bonds—and 2. secondary chemical bonds—e.g., hydrogen bonds; Van der Waals force bonds; ion-ion interaction; ion-dipole interaction.
Learn more about Chemistry
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The pressure exerted by a gas container depends on
Which is a group of tissues that work together to carry out a common function?
cell
organ
organelle
organ system
Answer:
Organ as a group of tissues working together is an organ.
Density is an example of a
3. 78 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the
concentration of the base?
A solution is prepared by mixing 0.10 of 0.12 M sodium chloride with 0.23 L of a 0.18 M magnesium chloride solution. What is the pCl- of the resulting solution?
Answer:
pCl⁻ = 0.54
Explanation:
First we calculate how many Cl⁻ moles are coming from each substance, using the given volumes and concentrations:
0.12 M NaCl * 0.10 L = 0.012 mol NaCl = 0.012 mol Cl⁻0.18 M MgCl₂ * 0.23 L = 0.0414 mol MgCl₂ = (0.0414 * 2) 0.0828 mol Cl⁻The final volume of the mixture is = 0.10 L + 0.23 L = 0.33 L
Now we calculate [Cl⁻], using the total number of Cl⁻ moles and the final volume:
[Cl⁻] = (0.012 mol + 0.0828 mol) / 0.33 L = 0.29 MFinally we calculate the pCl⁻ of the resulting solution:
pCl⁻ = -log[Cl⁻]pCl⁻ = 0.54A solution prepared by dissolving 171 mg of a sugar (a molecular compound and a nonelectrolyte) in 1.00 g of water froze at -0.930°C. What is the molar mass of this sugar? The value of Kf is 1.86°C/m.
Answer:
The appropriate answer is "342 g/mol".
Explanation:
Given:
Freezing point,
= 0.93°C
Kf,
= 1.86°C/m
Mass,
= 171
As we know,
⇒ [tex]Freezing \ point = Kf\times molality[/tex]
[tex]0.93=1.86\times molality[/tex]
[tex]Molality=\frac{0.93}{1.86}[/tex]
[tex]=0.5 \ m[/tex]
Now,
⇒ [tex]Molality=\frac{moles \ of \ sugar}{mass \ of \ water}[/tex]
[tex]0.5=\frac{moles \ of \ sugar}{0.01}[/tex]
[tex]moles \ of \ sugar=0.0005 \ mol[/tex]
hence,
The molar mass of the sugar will be:
= [tex]\frac{mass}{moles}[/tex]
= [tex]\frac{171\times 10^{-3}}{0.0005}[/tex]
= [tex]342 \ g/mol[/tex]
For the given reaction, what volume of CO2 can be produced from 3.6 L of O2 , assuming an excess of CO ? Assume the temperature and pressure remain constant. 2CO(g)+O2(g)⟶2CO2(g)
2NO(g) + O2(g) ==> 2NO2(g) ... balanced equation
From this balanced equation we see that 2 moles NO reacts with 1 mole O2. At constant pressure and temperature, we can also say that 2 liters of NO reacts with 1 liter of O2. Then we can determine volume of O2 needed to react with 4.8 L of NO as follows:
4.8 L NO x 1 L O2 / 2 L NO = 2.4 L of O2 required
Physical weathering can result from the action of all of the following EXCEPT __________.
ice
burrowing by animals
carbon dioxide
plant roots
Question 3 (4 points)
The concentration of hydroxide ions in a solution that has a poH of 6.0 is
a
10-6 M.
Ob
106 M.
Ос
101 M.
Od
10-8 M.
Answer:
a. 1.0 × 10⁻⁶ M (≈ 10⁻⁶ M)
Explanation:
Step 1: Given data
pOH of the solution: 6.0
Step 2: Calculate the concentration of hydroxide ions ([OH⁻]) in the solution
We will use the definition of pOH.
pOH = -log [OH⁻]
[OH⁻] = antilog -pOH
[OH⁻] = antilog -6.0
[OH⁻] = 1.0 × 10⁻⁶ M
Since [OH⁻] > 10⁻⁷ M, we can conclude that the solution is basic.
How many moles are in 153.00 grams of KCL3?
Explanation:
you have to use the formula
number of moles=mass/molar mass
=153/145.5
=1.05g/mol
I hope this helps
Which of the following is NOT a property of alkanes?
a)
The boiling point increases as the number of carbons in the compound
increases
b) They are unreactive under standard conditions
C) They have weak intermolecular attractions
d) They are soluble in water
Answer:
D
Explanation:
because alkanes don't dissolve in water. They are insoluble.
g 10.00 mL of phosphoric acid (H3PO4) are titrated with 0.1000 M sodium hydroxide. 15.00 mL of the sodium hydroxide solution are used in this experiment. Determine the molarity of phosphoric acid.
Answer: The molarity of phosphoric acid is 0.05 M
Explanation:
A neutralization reaction is defined as the reaction in which an acid reacts with a base to form a salt and water molecule.
At equivalence, moles of acid becomes equal to the moles of base. The equation for the neutralization follows:
[tex]n_1M_1V_1=n_2M_2V_2[/tex] ........(1)
where,
[tex]n_1, M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid that is [tex]H_3PO_4[/tex]
[tex]n_2, M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of the base that is NaOH
Given values:
[tex]n_1=3\\M_1=?M\\V_1=10.00mL\\n_2=1\\M_2=0.1000M\\V_2=15.00mL[/tex]
Plugging values in equation 1:
[tex]3\times M_1\times 10.00=1\times 0.1000\times 15.00\\\\M_1=\frac{1\times 0.1000\times 15.00}{3\times 10.00}\\\\M_1=0.05M[/tex]
Hence, the molarity of phosphoric acid is 0.05 M
how many milliliters of 0.105 M HCL are needed to titrate 22.5 ml of 0.118 M NaOH to the equivalence point
What property of a substance does its specific heat capacity describe?
Answer: How much heat it takes to raise the temperature
Explanation:
a pex
A concentrated salt solution has a mass of 5.29 g for a 5.00 mL sample. What is the specific gravity of this solution
Answer:
[tex]\rho_s=1.07g/cc^3[/tex]
Explanation:
From the question we are told that:
Mass [tex]M=5.29g[/tex]
Volume [tex]V=5.00mL=>5.0cc^3[/tex]
Generally the equation for Specific Gravity momentum is mathematically given by
[tex]Specific\ Gravity\ g= Density\ of\ Salt\ Solution\ \rho_s / Density\ of\ Water\ \rho_w[/tex]
[tex]g=\frac{ \rho_s} { \rho_w}[/tex]
[tex]\rho_s=\frac{ g} { \rho_w}[/tex]
[tex]\rho_s=\frac{ 5.29} { 5}[/tex]
[tex]\rho_s=1.07g/cc^3[/tex]
The specific gravity of this solution is = 1.06.
Specific gravity of a solution:The specific gravity of a solution is the mass of a unit volume of a substance to the mass of a unit volume of a given reference material.
Therefore specific gravity of the solution can be calculated as follows:
[tex]sg = \frac{density. of . substance}{density . of . water} [/tex]
But, density of substance (salt): mass/volume
mass = 5.29g
volume = 5.00mL
Therefore density = 5.29/5
= 1.06g/ml
But density of water is = 1 g/ ml
Therefore, specific gravity = 1.06/1
= 1.06
The specific gravity of a solution is 1.06.
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Carbon 14 and carbon 12 are both isotopes of the element carbon check all answers that are true about them
Answer:
CARBON 14 INCLUDES:
-six protons
-eight neutrons in the nucleus
CARBON 12 INCLUDES:
-six protons
-Six neutrons
Once formed, how many valence electrons does an anion hold?
Answer:
Anions. Some atoms have nearly eight electrons in their valence shell and can gain additional valence electrons until they have an octet. When these atoms gain electrons, they acquire a negative charge because they now possess more electrons than protons. Negatively charged ions are called anions.
How many grams of 02 are present in 7.49 L of oxygen gas?
Answer:
10.70grams
Explanation:
Density of a substance = mass/volume
At STP of a gas (standard temperature and pressure), the density of oxygen gas is 1.429 g/L
Hence, according to this question, in 7.49 L of oxygen gas, there would be:
Using D = m/V
1.429 = m/7.49
m = 1.429g/L × 7.49L
m = 10.70g