The correct answer for this question is that a statement that can be proven by observation or measurement is known as a fact. The other possible answers here simply refer to idea that different individuals can place value on, but that are not necessarily known to be true.
30.0 mL of pure water at 282 K is mixed with 50.0 mL of pure water at 343 K. What is the final temperature of the mixture
The final temperature of the mixture will be "305.6 K".
Heat and temperatureAccording to the question,
Mass of water, m₁ = 30.0 mL or,
= 30.0 mL × 1 g/mL
= 30.0 g
and,
m₂ = 50.0 mL × 1 g/mL
= 50.0 g
Specific heat of water = 4.18 J/g°C
We know the relation,
→ Heat lost + Heat gained = 0
By substituting the values,
30.0 × 4.18 (T - 282) + 50.0 × 4.18 (T - 320) = 0
30.0 × 4.18T - 1178.76 + 50.0 × 4.18T - 1337.6 = 0
hence,
The final temperature will be:
T = 305.6 K
Thus the answer above is appropriate.
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What is the molecular formula and chemical name of the compound? Examine the image. The letters Si in the center with four lines connecting it to 4 Fs, 1 in each direction.
Answer:
molecular formula is "SiF4" and compound name is "silicon tetrafluoride"
Explanation:
The estimated costs for remodelling the interior of an apartment are: three 1-gallon cans of paint at $13.69 each, two paint brushes at $9.53 each, and $135 for a helper. The total estimated cost with the appropriate significant figures is $
Answer:
$195
Explanation:
Step 1: Given data
Cost of a 1-gallon can of paint (cC): $13.69Number of 1-gallon cans of paint (nC): 3Cost of a paint brush (cB): $9.53Number of paint brushes (nB): 2Cost of a helper (cH): $135Number of helpers (nH): 1Step 2: Calculate the total estimated cost for remodelling the interior of an apartment
We will use the following expression.
C = cC × nC + cB × nB + cH × nH
C = $13.69 × 3 + $9.53 × 2 + $135 × 1
C = $195
how many pi bonds does a triple bond has
Answer:
A triple bond have two pi bonds.
Explanation:
This is an alkaline that contains one sigma bond and two pi bonds.
Hope my answer helps.
Answer:
Two
Explanation:
200ml hard water was boiled with 100ml N/50 Na2CO3 reagent. After boilingg the volume was again made to 200mand the solution filtered. 25ml of this filtrate required 8.2ml of N/50 HCl for neutralisation
Answer:
Here is the full question:
200ml hard water was boiled with 100ml N/50 Na2CO3 reagent. After boilingg the volume was again made to 200mand the solution filtered. 25ml of this filtrate required 8.2ml of N/50 HCl for neutralisation.
Calculate the permanent hardness in ppm.
Explanation:
Remember that the hard water was boiled with 100ml N/50 Na2CO3 reagent. Therefore, the milliequivalent of carbonate ion in 100 ml of N/50 Na2CO3 solution is given as 100 × [tex]\frac{1}{50}[/tex] = 2
The solution was made of 200 ml and 25 ml of the filtrate was neutralised with 8.2 ml N/50 HCl.
The milliequivalent of carbonate ions remaining in the filtrate is [tex]\frac{200}{25}[/tex] × 8.2 × [tex]\frac{1}{50}[/tex] = 1.3 milliequivalent
To get the milliequivalent of carbonate ion precipitated, we need to subtract the milliequivalent of the two carbonate ions. This will give us
2 − 1.3 = 0.7g
The amount of CaCO3 present in 200 ml water = 0.7 × 50 = 35g
Permanent hardness = [tex]\frac{35}{200}[/tex] × 1000 = 175 ppm.
Permanent hardness of water after boiling is 175ppm.
What is hardness of water?Hardness of water is of two types, one those will cam be removed by boiling is known as temporary hardness and which can not be removed by boiling is known as permanent hardness.
Given that hard water is heated with = 100mL N/50 Na₂CO₃.
Milliequivalent of carbonate ion in 100ml of N/50 Na₂CO₃ = 100×1/50=2
The milliequivalent of carbonate ions remaining in the filtrate is 200/25× 8.2 × 1/50 = 1.3 milliequivalent
Milliequivalent of carbonate ion precipitated = 2 - 1.3 = 0.7g
The amount of CaCO₃ present in 200 ml water = 0.7 × 50 = 35g
Permanent hardness will be calculated as:
P.H. = 35/200 × 1000 = 175ppm.
Hence, permanent hardness of water is 175ppm.
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Is a Animal and Plant cell living
Olivia noticed that the pH of her garden soil decreased after it rained. Did her garden soil become more acidic or less acidic
Answer:
The garden soil become more acidic.
Explanation:
The pH is defined as -log [H⁺]. An acidic solution contains an important amount of [H⁺]. When the pH increases, H⁺ decreases doing the solution more basic. In the other way, an increasing in H⁺ concentration decreases the pH doing the solution more acidic.
The pH of the garden soil of Olivia decreases after it rained. As pH decreases, [H⁺] increases become the garden soil more acidic.
explain why the neutralization reaction of a strong base and weak acid gives a weakly basic solution
Answer:
when an acid react with a base, salt and water is produced. It is because the nature of salt formed determines whether the solution is neutral, acidic or basic
Hope this helps :)
How many L are in 0.74 CL ?
Answer:
0.0074 cL
7.4 x 10⁻³ cL
Explanation:
Step 1: Find conversion
1 liter (L) = 100 centiliters (cL)
Step 2: Set up dimensional analysis
[tex]0.74cL(\frac{1L}{100cL} )[/tex]
Step 3: Multiply and cancel out units
cL and cL cancel out.
We are left with L.
0.74/100 = 0.0074 cL or 7.4 x 10⁻³ cL
MgSO4(aq) + 2NaOH(aq) Mg(OH)2(s) + Na2SO4(aq) i. Write the complete ionic equation from the balanced equation. (3 points) Please help!
Answer:
Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg²⁺(aq) + 2OH⁻(s) + 2Na⁺(aq) + SO₄²⁻(aq)
Explanation:
The complete ionic equation is the chemical equation where the chemical species in the aqueous phase (aq) are written as ions.
In the reaction:
MgSO₄(aq) + 2NaOH(aq) → Mg(OH)₂(s) + Na₂SO₄(aq)
MgSO₄ dissociates in Mg²⁺ and SO₄²⁻, NaOH in Na⁺ and OH⁻, Mg(OH)₂ doesn't dissociate because is as solid and NaSO₄ dissociates in Na⁺ and SO₄²⁻ ions.
That means the complete ionic equation is:
Mg²⁺(aq) + SO₄²⁻(aq) + 2Na⁺(aq) + 2OH⁻(aq) → Mg²⁺(aq) + 2OH⁻(s) + 2Na⁺(aq) + SO₄²⁻(aq)Imagine that you're doing an experiment to determine how the running speed
of a hamster depends on the weight of the hamster. When plotting your data,
what variable should be on the y-axis?
A. Speed of hamster
B. Color of hamster
C. Weight of hamster
D. Type of hamster
How do you determine a number of each particle?
Answer:
Search Results
Featured snippet from the web
To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number:
number of protons = atomic number.
number of electrons = atomic number.
number of neutrons = mass number - atomic number.
Explanation:
Liquid methanol (CH3OH) reacts with oxygen gas to form carbon dioxide gas and water vapor. Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
[tex]2CH_3OH_{(l)} + 3O_2_{(g)} --> 2CO_2_{(g)} + 4H_2O_{(g)}[/tex]
Explanation:
The reaction between methanol and oxygen can be expressed as an equation below:
[tex]CH_3OH + O_2 --> CO_2 + H_2O_[/tex]
However, the equation is not balanced as the number of the molecule of each atom on the right-hand side and the left-hand side is not the same. The balanced equation showing the phases of all the reactants and products is as below:
[tex]2CH_3OH_{(l)} + 3O_2_{(g)} --> 2CO_2_{(g)} + 4H_2O_{(g)}[/tex]
Two molecules of liquid methanol react with three molecules of oxygen gas to give 2 molecules of carbon dioxide gas and four molecules of water vapor.
For the following reaction,increasing the pressure will cause the equilibrium to ________.
2SO2 (g) + O2 (g)_ 2 SO3 (g) +heat
A) remain unchanged, but the reaction mixture will getcooler
B) shift to the right, towards products
C) shift to the left, towards reactants
D) remain unchanged, but the reaction mixture will getwarmer
E) Pressure has no effect on equilibrium.
For the given reaction increasing the pressure will cause the equilibrium to shift to the left, towards reactants.
What is equilibrium law?According to this law on applying extrenal stress on the equilibrium state of any reaction then it will shift to that side where effect of the stress getting low.
Given chemical reaction is:
2SO₂(g) + O₂(g) → 2SO₃(g) + heat
In the reaction heat is also produced in the forward direction and from the ideal gas equation PV=nRT it is clear that pressure is directly proportional to the temperature. So when we increasing the presssure then temperature will also increase as a result of increase in heat. So minimize this effect reaction will shift to the left side.
Remain unchanged with cooler and warmer condition is impossible.will not shift to right side as it also increases pressure.Hence reaction will shift to the left side of the equilibrium.
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How many electrons does each lithium atom provide to the voltaic cell? Question 6 options: A) 2 B) 1 C) 3 D) 4
Answer:
B) 1
Explanation:
Lithium is a univalent element, univalent means that it has only one valence electron. If this is true, then lithium can only provide this one valence electron in a voltaic cell.
From the foregoing, each lithium atom can only provide one valence electron in the voltaic cell.
Answer:
B) 1
Explanation:
I got it in class!
Hope this Helps!! :))
What is science in 5 sentences
Answer:
Science is both boon and curse for living beings.
Science is the action to find out any fact regarding the natural world.
Science gives accurate facts, formulas, laws and theories.
Science has many major fields like chemistry, physics, biology etc.
Science is valued by society because the application of scientific knowledge helps to satisfy many basic human needs and improve living standards.
define what is halflife
Answer: the time taken for the radioactivity of a specified isotope to fall to half its original value.
Explanation:
Answer:
Half-life is the time required for a quantity to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo, or how long stable atoms survive, radioactive decay.
Which are different forms of an element that have different numbers of neutrons?
The number of neutrons is variable, resulting in isotopes, which are different forms of the same atom that vary only in the number of neutrons they possess. Together, the number of protons and the number of neutrons determine an element's mass number.
tbh google
hope it helps
Explanation:
The atoms of a chemical element can exist in different types. These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons.
After mixing an excess PbCl2 with a fixed amount of water, it is found that the equilibrium concentration of Pb2 is
Answer:
Ksp = 8.8x10⁻⁵
Explanation:
Full question is:
After mixing an excess PbCl2 with a fixed amount of water, it is found that the equilibrium concentration of Pb2+ is 2.8 × 10–2 M. What is Ksp for PbCl2?
When an excess of PbCl₂ is added to water, Pb²⁺ and Cl⁻ ions are produced following Ksp equilibrium:
PbCl₂(s) ⇄ Pb²⁺ + 2Cl⁻
Ksp = [Pb²⁺] [Cl⁻]²
If an excess of PbCl₂ was added, an amount of Pb²⁺ is produced (X) and twice Pb²⁺ is produced as Cl⁻ (2X):
Ksp = [X] [2X]²
Ksp = 4X³
As X is the amount of Pb²⁺ = 2.8x10⁻²M:
Ksp = 4(2.8x10⁻²)³
Ksp = 8.8x10⁻⁵he solubility of oxygen gas in water at 25 °C and 1.0 atm pressure of oxygen is 0.041 g/L. The solubility of oxygen in water at 2.5 atm and 25 °C is ________ g/L.
Answer:
0.1025 g/L
Explanation:
From the question above,
The solubility of oxygen gas in water at 25°c and 1.0 atm pressure is 0.041g/L
Henry's law states at a constant temperature the solubility of a gas is proportional to the pressure
Since the temperatures are both similar (25°c) then, the solubility of oxygen in water at 2.5 atm can be calculated as follows
= 0.041/1.0 × 2.5
= 0.041×2.5
= 0.1025 g/L
Hence the solubility of oxygen in water at 2.5 atm and 25°c is 0.1025 g/L
It is relatively easy to change the temperature of a substance that:_______
a. is an insulator.
b. has a low specific heat capacity
c. has a high specific heat capacity.
d. is brittle. e is very massive
Answer:
b. has a low specific heat capacity.
Explanation:
Hello,
In this case, since the specific heat is defined as the heat required to increase or decrease 1 degree Celsius 1 gram or mole of a specific substance, we infer that the lower the specific heat, the less energy will be needed for such increase or decrease, therefore, it turns out easier to modify the temperature in a substance that b. has a low specific heat capacity.
Best regards.
Perform the calculation, rounding your answer to the proper number of significant figures.
0.8730 divided by 9.650 =
Answer:
Hey!
0.8730 / 9.650 = 8.42445
Explanation:
8.42445 TO 2 s.f... (best option for rounding)
= 8.4
ANSWER = 8.4 (2 s.f)
HOPE THIS HELPS!!
Spongebob was trying to make Krabby Patties that weighed 12oz. He made 4 Krabby Patties. They all had the following weights: 12.12oz; 11.9oz; 12.2oz; 12.1oz. Is this an example of Accuracy? Precision? Both? Neither?
Answer:
Yes, the 4 Krabby patties are an example of high precision.
Explanation:
Precision is the closeness of the values obtained by applying them to the same parameter. To calculate the precision, the closeness of each of the values with the mean must be determined, all the values will be taken by subtracting the mean and the values will be taken into account to know which are the most accurate.
(12.12 + 11.9 + 12.2 + 12. 1) / 4 = 12.08
12.12 - 12.8 = 0.04
11.9 - 12.08 = - 0. 18
12.2 - 12.08 = 0.12
12.1 - 12.08 = 0.02
The most accurate precision is that of the fourth Krabby Pattie and the least precise is that of the second.
Explanation:
Step 1: Determine what precision and accuracy is
According to online, "precision is how close measure values are to each other, basically how many decimal places are at the end of a given measurement. Precision does matter. Accuracy is how close a measure value is to the true value. Accuracy matters too, but it's best when measurements are both precise and accurate."
Step 2: Determine which are displayed in this problem
We can see that most of these weight are really close to the original weight which means that the accuracy is pretty high. This means that our weights are fairly close to the original predicated amount.
We can also see that our precision is somewhat decent because most of the numbers bunch up around each other. Precision and accuracy don't have to occur at the same time. For example, a precise collection can be 15, 15.01, 14.99. Although they are far away from the original point, they are bunched up together giving a high precision.
What volume of 1.25 M sodium hydroxide (NaOH) solution can be prepared using 60.0 g of sodium hydroxide? (The mass of one mole of NaOH is 40.0 g.)
0.667 L
0.833 L
1.20 L
1.88L
Answer:
The answer is
1.20 LExplanation:
Since the concentration , mass and molar mass of NaOH has been given we use the formula
[tex]C = \frac{m}{M \times v} [/tex]To find the volume
where
C is the concentration
m is the mass
M is the molar mass
v is the volume
Making volume the subject we have
[tex]v = \frac{m}{C \times M} [/tex]From the question
C = 1.25 M
m = 60 g
M = 40.0 g/mol
Substitute the values into the above formula and solve for the volume
We have
[tex]v = \frac{60}{1.25 \times 40} \\ v = \frac{60}{50} \\ v = \frac{6}{5} [/tex]We have the final answer as
Volume = 1.20 LHope this helps you
Convert a speed of 259 cm/s to units of inches per minute. Also, show the unit analysis by dragging components into the unit‑factor slots.
Answer:
[tex]6118.11\frac{in}{min}[/tex]
Explanation:
Hello,
In this case, by knowing that 1 inch equals 2.54 cm and 60 seconds equals 1 min, the resulting value results:
[tex]=259\frac{cm}{s}*\frac{1in}{2.54cm}*\frac{60s}{1min}\\ \\=6118.11\frac{in}{min}[/tex]
Best regards.
Which of these statements correctly compares probeware (such as an electronic temperature probe) to traditional analog tools (such as a liquid-based thermometer)? Measurements by traditional analog tools are good to a larger number of significant figures. Measurements by traditional analog tools are less prone to experimental error. Probeware is typically very difficult to transport. Probeware is useful for obtaining many measurements in rapid succession.
The correct answer is D. Probeware is useful for obtaining many measurements in rapid succession.
Explanation:
Probeware refers to specialized equipment and programs that collect and analyze data. Indeed, Probeware integrates tools to register information such as distance or temperature with software. This complex system is useful to record and analyze a lot of data or measurements, which is not possible with analog tools. Moreover, due to the integration of software, multiple measurements can be recorded and analyzed in a short time, which is known as rapid succession. According to this, one difference between Probeware and analog tools is that "Probeware is useful for obtaining many measurements in rapid succession."
Answer:
Probeware is useful for obtaining many measurements in rapid succession.
What type of elements is on the right side of a Periodic Table?
What type is on the left?
Answer:
the right side of the periodic table are metals while the left side are non metals (with the exception of hydrogen)
Calculate the solubility of BaCrO4 in water at . You'll find data in the ALEKS Data tab. Round your answer to significant digits.
Answer:
1.08 × 10⁻⁵ M
Explanation:
Calculate the solubility of BaCrO₄ in water at 25°C. You'll find data in the ALEKS Data tab. Round your answer to 3 significant digits.
Step 1: Write the reaction for the solution of BaCrO₄
BaCrO₄(s) ⇄ Ba²⁺(aq) + CrO₄²⁻(aq)
Step 2: Make an ICE chart
We can relate the molar solubity (S) with the solubility product constant (Ksp) using an ICE chart. The Ksp for BaCrO₄ is 1.17 × 10⁻¹⁰.
BaCrO₄(s) ⇄ Ba²⁺(aq) + CrO₄²⁻(aq)
I 0 0
C +S +S
E S S
The solubility product constant is:
Ksp = 1.17 × 10⁻¹⁰ = [Ba²⁺] [CrO₄²⁻] = S²
S = √1.17 × 10⁻¹⁰ = 1.08 × 10⁻⁵ M
how to calculate average mass in grams?
Explanation:
hope these help you answer
What is the wavelength, in nanometers, of light with a frequency of 5.89 x 10¹⁴ s⁻¹?
Answer:
≅ 50, 909 nm
Explanation:
Wavelength, λ = [tex]\frac{speed}{freq}[/tex]
Given:
speed of light = [tex]3*10^{8} m/s[/tex]
f = 5.89 × [tex]10^{14}[/tex]
∴ λ = 3×[tex]10^{8}[/tex] / 5.89 × [tex]10^{14}[/tex]
= 0.0000509 m ≅ 50, 909 nm
Let me know if you need further assistance