Answer:
safety glasses, safety goggles, face shield, they protect your eyes from harmful liquids, bright lights
Dividend
Divisor
Quotient/ Remainder
SAGOT
75
21
16.) 54
17.) 108
18.) 380
19.) 633
20.) 648
27
76
57
32
Solo
nihanda ni:
NNA MARIE S. CARAIT
borrinoloticon
Answer:
Dividend Divisor Quotient/ Remainder SAGOT 75 21 16.) 54 17.) 108 18.) 380 19.) 633 20.) 648 27 76 57 32. Solo nihanda ni: NNA MARIE S.
Explanation:
A sample of polystyrene, which has a specific heat capacity of 1.880 J.g .°C , is put into a calorimeter (see sketch at right) that contains 300.0 g of water. The polystyrene sample starts off at 94.9 °C and the temperature of the water starts off at 22.0 When the temperature of the water stops changing it's 27.7 °C. The pressure remains constant at 1 atm. Calculate the mass of the polystyrene sample.
Answer:
56.6g
Explanation:
Given that :
Mass of water, m1= 300.0 g
Temperature of water, T1= 22°C
Specific heat capacity of water, C= 4.184 J/g°C
Mass of polystyrene, m2=?
Temperature of polystyrene = 94.9
Specific heat capacity of polystyrene, c2= 1.88 J/g°C
Final temperature = 27.7 oC
Heat lost by polystyrene = Heat gained by water
mc(dT) = mc(dT)
m2 * 1.88 * (94.9 - 27.7) = 300 * 4.184 * (27.7 - 22)
m2 * 1.88*67.2 = 300*4.184*5.7
126.336 * m2 = 7154.64
m2 = 7154.64 / 126.336
m2 = 56.631838
Hence, mass of polystyrene = 56.6g
Match one graph shown at right to each of the gas laws named below.
Charles's law: a, c, d, e (b is incorrect)
Gay-Lussac’s law: a, b, d, e (c is incorrect)
Boyle’s law: b, c, d, e (a is incorrect)
Answer:
DBE
Explanation:
Cause I got it right
The correct options for Charles's law, Gay-Lussac's Law and Boyle's law are D, B and E respectively.
Charles's law states that, under the assumption of constant pressure, the volume of a gas increases or decreases with its temperature. As the temperature increases, the gas molecules move more quickly and occupy more space, increasing the volume of the gas.
Gay-Lussac's law states that, assuming a constant volume, the pressure and temperature of a gas are exactly related. Increasing temperature causes the gas molecules to become more kinetically energetic and collide with the walls of the container more frequently, increasing the pressure.
Boyle's law states that at a given temperature, the pressure and volume of a gas are inversely proportional. The reduced volume forces the gas molecules into a smaller area, increasing the chance of collisions with the container walls and pressure.
Therefore, the correct options for Charles's law, Gay-Lussac's Law and Boyle's law are D, B and E respectively.
Learn more about Boyle's law, here:
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What is the correct name for Cr2O3?
A. Chromium trioxide
B. Chromium(III) oxide
C. Dichromium trioxide
D. Chromium(II) trioxide
how to rapidly separate red#40 from ZnO
Answer:
your question :how to rapidly separate red#40 from ZnO
answer :Red #40 is soluble in water while zinc oxide is not. 4- heat the solution of red #40 and water until water evaporates and red#40 remains
hope it's help
#carryONlearning
Circuit A has a resistance of 7.5 ohms, and circuit B has a resistance of 5 ohms. Which statement about the circuits must be correct?
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is equal to the current in circuit B
If the current in circuit A is equal to the current in circuit B, then the voltage in circuit A is less than the
voltage in circuit B
If the current in circuit A is less than the current in circuit B, then the voltage in circuit A is less than the
voltage in circuit B
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the
current in circuit B
Answer:
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B
Explanation:
To know the the correct answer to the question, do the following:
Case 1: Let the circuit A and B have equal voltage say 24 V.
For Circuit A:
Voltage (V) = 24 V
Resistance (R) = 7.5 ohms
Current (I) =?
V = IR
24 = I × 7.5
Divide both side by 7.5
I = 24 / 7.5
I = 3.2 A
For Circuit B:
Voltage (V) = 24 V
Resistance (R) = 5 ohms
Current (I) =?
V = IR
24 = I × 5
Divide both side by 5
I = 24 / 5
I = 4.8 A
Thus for the same voltage, current in circuit A is less than the current in B.
Case 2: Let circuit A and B have equal current say 2 A
For circuit A:
Current (I) = 2 A
Resistance (R) = 7.5 ohms
Voltage (V) =?
V = IR
V = 2 × 7.5
V = 15 V
For Circuit B:
Current (I) = 2 A
Resistance (R) = 5 ohms
Voltage (V) =?
V = IR
V = 2 × 5
V = 10 V
Thus, for the same current, the voltage in circuit A is greater than the voltage in B
Case 3: Let circuit A have a current of 4 A and circuit B have a current of 5 A
For circuit A:
Current (I) = 4 A
Resistance (R) = 7.5 ohms
Voltage (V) =?
V = IR
V = 4 × 7.5
V = 30 V
For circuit B:
Current (I) = 5 A
Resistance (R) = 5 ohms
Voltage (V) =?
V = IR
V = 5 × 5
V = 25 V
Thus, when the current in circuit A is less than the current in circuit B, the voltage in circuit A is greater than the voltage in circuit B.
From the illustrations above and the options given in the question, the current answer is:
If the voltage of circuit A is equal to the voltage of circuit B, then the current in circuit A is less than the current in circuit B
Which statement correctly describes atoms? *
-Atoms combine to make all the substances on Earth.
-Atoms of all substances have the same chemical properties.
-Atoms are easily destroyed when matter is cooled or heated.
-Atoms come in different sizes, but most are visible using a simple hand lens.
Answer: Atoms combine to make all the substances on Earth.
Explanation:
Atom is a smallest entity of any matter. The atoms of different elements combine together in order to form new substances. The atoms have electrons, neutrons, as well as protons. The atoms are combined by the chemical bond. When two or more atoms combine they form a molecule. The molecules combine to form compound. Atoms cannot be broken into sub parts. The two atoms of hydrogen and one of oxygen forms water which is an essential liquid on planet earth. Other substances like carbon dioxide, coal, and sodium chloride.
4 moles of monoatomic ideal gas is compressed adiabatically causing the temperature to increase from 300 K to 400 K. Calculate the work done on the gas in units of Joules (if the answer is negative, be sure to enter a negative sign in your answer).
Answer:
the work done on the gas is 4,988.7 J.
Explanation:
Given;
number of moles of the monoatomic gas, n = 4 moles
initial temperature of the gas, T₁ = 300 K
final temperature of the gas, T₂ = 400 K
The work done on the gas is calculated as;
[tex]W = \Delta U = nC_v(T_2 -T_1)[/tex]
For monoatomic ideal gas: [tex]C_v = \frac{3}{2} R[/tex]
[tex]W = \frac{3}{2} R \times n(T_2-T_1)[/tex]
Where;
R is ideal gas constant = 8.3145 J/K.mol
[tex]W = \frac{3}{2} R \times n(T_2-T_1) \\\\W = \frac{3}{2} (8.3145) \times 4(400-300) \\\\W = \frac{3}{2} (8.3145) \times 4(100)\\\\W = 4,988.7 \ J[/tex]
Therefore, the work done on the gas is 4,988.7 J.
When two substances combine to form a mixture, the properties of the substances change. True False
Answer:
Tell students that sometimes when two (or more) substances are mixed together, a change occurs and another substance (or substances) is created. This is called a chemical reaction. Gas may form, heat may be produced, and color may change. These types of changes indicate that a chemical reaction has occurred.
20 POINTS! NEED HELP
How many electrons does sulfur have to gain to achieve the Octet Rule?
1. 1 electron
2. 2 electrons
3. 3 electrons
4. 4 electrons
Answer:
Sulfur needs 2 more electrons to achieve octet in its valence shell.
Explanation:
According to the electronic configuration, 2 electrons are required to be gained by the sulfur to achieve the octet rule.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Learn more about electronic configuration,here:
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All of the following are physical changes except
A. ice melting.
B. plaster hardening.
C. paint drying.
D. rocket fuel burning.
Answer:
rocket fuel burning i think
A food company produces raspberry coulis as a topping for its best-selling line, double strength chocolate mousse pie. Fresh raspberries comprising 5% seeds, 20% pulp solids, and 75% water are homogenised and placed in a stainless steel vat. Sugar is added to give a raspberry:sugar mass ratio of 3.5:1. The mixture is blended, strained to remove the seeds, then heated to reduce the water content to 35%. Half a tonne of coulis is produced every day.
Required:
a. What mass of raspberries is required per week?
b. How much sugar is required per week?
c. What is the sugar content of the coulis?
Answer:
5357.1429kg per week
2142.8571 kg per week
Explanation:
Given that :
Fresh Raspberries :
5% = seeds
20% = pulp solids
75% = water
Raspberry : Sugar = 3.5 : 1
Water content = 35%
Coulis produced per day = 0.5 tonnes
Mass of Raspberry produced per week :
Mass is measured in kg;
1 tonne = 1000kg
0.5 tonne = (1000/2) kg = 500kg
Mass of Coulis produced per week = 500kg * 7 = 3500kg
Coulis contains 35% water, Raspberry required 75% water :
(3500 / 35) * 75 = 7500kg
Raspberry : Sugar ratio = 3.5 : 1
Mass of Raspberry :
[7500 - (1 /3.5) * 7500]
7500 - 2142.8571
= 5357.1429kg per week
B.
Sugar required per week:
(1/3.5) * 7500kg
= 2142.8571 kg per week
C.)
Sugar content in coulis :
nitrophenol is more acidic than phenol.
Answer:
The p- nitrophenol is more acidic than phenol because the deactivating nature of nitro group and after loosing the protons it makes more resonance stabilization as nitro group is having strong deactivating nature so it attracts electrons towards it.
What might be one potential solution for eliminating the crown-of-thorns starfish from the Great Barrier Reef?
introducing a predator to eat the starfish
eliminating their food supply to starve them
introducing a different species that outcompetes them
hunting or culling by humans
Answer:
hunting or culling by humans
Explanation:
The hunting will decrease the starfish
The vapor pressure of liquid pentane, C5H12, is 40.0 mm Hg at 244 K. A sample of C5H12 is placed in a closed, evacuated container of constant volume at a temperature of 409 K. It is found that all of the C5H12 is in the vapor phase and that the pressure is 62.0 mm Hg. If the temperature in the container is reduced to 244 K, which of the following statements are correct?
a. No condensation will occur.
b. The pressure in the container will be 100. mm Hg.
c. Only pentane vapor will be present.
d. Some of the vapor initially present will condense.
e. Liquid pentane will be present.
Answer:
b. The pressure in the container will be 100mm Hg.
d. Some of vapor initially present will condense.
Explanation:
The vapor pressure of liquid Pantene rises when there is container where evacuation of water molecules is restricted. The pressure inside the container rises to 100 mm Hg and then liquid molecules start condensing. These molecule form vapors.
What is an extinct species? *
(10 Points)
O A. a species that blends in easily with its environment
O B. a species that resembles another species
O C. a species that was unable to adapt and died out
O D. a species that is bred for specific characteristics
Answer: C
Explanation: I got it right.
Trial 12 1.Volume of Acid used ( mL) 2020 2.Molarity of acid used (M) 0.0160.016 3.Initial volume reading of base buret 018.6 4.Final volume reading of base used 18.636.9 5.Volume of base used (4-3, mL) _________ _________ 6.Molarity of base (1*2/5, M) _________ _________ 7.Average molarity of base _________
Answer:
[tex]V_B = 18.3mL[/tex] -- Volume of base used
[tex]M_B = 0.0175M[/tex] --- Molarity of base
Explanation:
Given
[tex]V_A = 20mL[/tex] -- Volume of acid used
[tex]V_B_1 = 18.6mL[/tex] --- Buret Initial reading
[tex]V_B_2 = 36.9mL[/tex] --- Buret Final reading
[tex]M_A = 0.016M[/tex] --- Molarity of the acid
Solving (a): Volume of base used (VB)
This is calculated by subtracting the initial reading from the final reading of the base buret.
i.e.
[tex]V_B = V_B_2 - V_B_1[/tex]
[tex]V_B = 36.9mL - 18.6mL[/tex]
[tex]V_B = 18.3mL[/tex]
Solving (b): Molarity base (MB)
This is calculated using:
[tex]M_A * V_A = M_B * V_B[/tex]
Make MB the subject
[tex]M_B = \frac{M_A * V_A }{V_B}[/tex]
This gives:
[tex]M_B = \frac{0.016M *20mL}{18.3mL}[/tex]
[tex]M_B = \frac{0.016M *20}{18.3}[/tex]
[tex]M_B = \frac{0.32M}{18.3}[/tex]
[tex]M_B = 0.0175M[/tex]
Solving (c): There is no such thing as average molarity
what does the picture depict about ecology?
Which statement correctly describes the conductivity of the specified material?
Gold has a high conductivity
Most plastics have a high conductivity
Most wires are made to have a low conductivity
Copper has a low conductivity
Answer:
Gold has a high conductivity
Explanation:
This is because gold is a metal that occur free in nature in rocks, alluvial , grains e.t.c. it is a transition metal and in group 11 of the periodic table do it conduct electricity. It has has conductivity because it is a metals because all metals have ability to conduct electricity. When it is pure, it is a bright, slightly reddish yellow, . It is soft, malleable.
It is a ductile metal
and ductile metal.
Answer:GOLDDDDD
Explanation:
Fill in the blank with the correct answer to complete the sentence.
Word bank
size
velocity
distance
time
Momentum increases with an increase in mass and
Explanation:
momentum increases with an increase in mass and velocity
Which of the following is true?
A)If we know that a reaction is an elementary reaction, then we know its rate law.
B)The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism.
C)Since intermediate compounds can be formed, the chemical equations for the elementary reactions in a multistep mechanism do not always have to add to give the chemical equation of the overall process.
D)In a reaction mechanism, an intermediate is identical to an activated complex.
E)all of these statements are true.
Answer:
If we know that a reaction is an elementary reaction, then we know its rate law.
Explanation:
An elementary reaction is a reaction that takes place in one reactive encounter. This means that the two species interact in a single step to give the products.
If two reactants interact in a single step to yield the products then we can easily deduce the rate law from the reaction equation.
For instance, For the reaction;
2A + B → C
The rate law is
rate = k[A]²[B].
If the reaction is an elementary reaction and the equation of the reaction is balanced, then we can deduce the rate law from the balanced reaction equation.
Many inland areas around Florida contain extinct marine fossils. Which of the following statements best describes how this might have occurred?
Answer:
D
Explanation:
strong winds carried marine organisms inland where they were buried and fossilized under layer of sediment
Answer:
Strong winds carried marine organisms inland where they were buried and fossilized under layers of sediment.
Explanation:
As human populations grow, it becomes more important to use renewable sources of energy. Which of the following objects uses energy from a renewable source?
A-a stove that is powered by natural gas
B- a refrigerator that runs on solar power
C- a lantern that burns oil from beneath Earth's surface
D- a toaster that uses electricity from a coal-burning power plant
Question 5
2 pts
How many atoms of helium are found in a helium balloon if it has 3.9g of helium
inside?
The answer should be
x1023
Type the number that precedes the x1023
Answer: There are [tex]6.2\times 10^{23}[/tex] atoms of helium are found in a helium balloon if it has 3.9 g of helium inside.
Explanation:
According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}=\frac{3.9g}{4.00g/mol}=0.975moles[/tex]
1 mole of helium contains = [tex]6.023\times 10^{23}[/tex] atoms
Thus 0.975 moles of helium contain = [tex]\frac{6.023\times 10^{23}}{1}\times 0.975=6.2\times 10^{23}[/tex] atoms
what is the geolgic tike scale based on?
Answer: The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
Explanation: I learned about it the other day
A helium balloon has a volume of 36 L. The pressure of the helium gas in the balloon is 132 kPa and its temperature is 27 degrees Celsius. How many moles of helium are in the balloon?
Answer:
[tex]n =1.905mol[/tex]
Explanation:
Hello!
In this case, by considering helium gas as an ideal one, we can use the following equation:
[tex]PV=nRT[/tex]
Whereas P should go in atmospheres and T in Kelvins; thus we proceed as follows:
[tex]n=\frac{PV}{RT}=\frac{132kPa*\frac{1atm}{101.325kPa}*36L}{0.08206\frac{atm*L}{mol*K}(27+273)K} =1.905mol[/tex]
Best regards!
Find the total mass in kilograms of a ring that contains a 5.0 x 10 -1 carat diamond and 7.00 grams of gold.
Answer:
49 вот правильный ответ
A sample of 523.1 mg of impure KBr is treated with an excess of AgNO3 and 814.5 mg of AgBr is obtained. What is the purity of KBr?
Answer:
98.68%
Explanation:
Step 1: Write the balanced equation
KBr + AgNO₃ ⇒ AgBr + KNO₃
Step 2: Calculate the moles corresponding to 814.5 mg (0.8145 g) of AgBr
The molar mass of AgBr is 187.77 g/mol.
0.8145 g × 1 mol/187.77 g = 4.338 × 10⁻³ mol
Step 3: Calculate the moles of KBr needed to produce 4.338 × 10⁻³ moles of AgBr
The molar ratio of KBr to AgBr is 1:1. The moles of KBr needed are 1/1 × 4.338 × 10⁻³ mol = 4.338 × 10⁻³ mol.
Step 4: Calculate the pure mass corresponding to 4.338 × 10⁻³ moles of KBr
The molar mass of KBr is 119.00 g/mol.
4.338 × 10⁻³ mol × 119.00 g/mol = 0.5162 g
Step 5: Calculate the purity of KBr
0.5162 g of KBr are in a 0.5231 g-sample. The purity of KBr is:
P = 0.5162 g/0.5231 g × 100% = 98.68%
Which illustration is a closed circuit? * + A B
Answer:
I believe its B for sure
Hope this helps!
Explanation:
To run a spectrophotometry experiment, begin by _________ the spectrophotometer and preparing the samples. Be sure to select the correct ________, then run a measurement on the _________ solution. Follow up by running measurements on _______solutions. Once data is collected, turn off the instrument, clean the area, and discard the samples.
Answer:
To run a spectrophotometry experiment, begin by warming up the spectrophotometer and preparing the samples. Be sure to select the correct wavelength, then run a measurement on the blank solution. Follow up by running measurements on sample solutions. Once data is collected, turn off the instrument, clean the area, and discard the samples.
Explanation:
The spectrophotometer is a device used in laboratories to carry out analysis in experiments that need to measure and compare the amount of light absorbed or transmitted between samples, regardless of whether the samples are transparent or opaque solid. The spectrophotometer can be single-beam and double-beam. Regardless of the nature of the beam, to perform a spectrophotometry experiment, you must start by heating the spectrophotometer and preparing the samples. Make sure to select the correct wavelength and perform a measurement on the blank solution. Follow up by performing measurements on sample solutions. Once the data is collected, turn off the instrument, clean the area and discard the samples.
