Answer:784.532 newton
When heating a sample to extreme heat over a flame, you will often use a crucible. Before starting the heating, you should locate the correct labware for the experiment, including the equipment to safely handle and support the crucible. What equipment should you have ready to start your crucible experiment
Answer:
The equipments you should have ready to start the crucible experiment includes: safety goggles, crucible with lid, crucible tong, ring support with clay triangle, Bunsen burner and heat resistant tile.
Explanation:
Crucible is an equipment in the laboratory which is suitable for heating a sample to extreme heat over a flame, Modern laboratory crucible are made up of graphite- based composite materials for achievement of higher performance. Because extreme heat is involved, you should locate the correct labware for the experiment, including the equipment to safely handle and support the crucible. These equipments includes:
--> Safety goggles: Because you will work with chemical it is advisable to use a safety goggles which protects the eyes from dangerous floating chemical aerosol.
--> crucible with lid: This is the main apparatus with the lid (cover) which is used to cover the crucible to prevent spilling of the boiling chemical.
--> Crucible tong: These are scissors like tools used to grasp hot crucible.
--> Ring support with clay triangle: the clay triangle is used to hold crucible when they are being heated. They usually sit on a ring stand.
--> Bunsen burner: Produces a single open gas flame which can be used for heating.
With the safety equipments listed above, you can carry out experiment using the crucible. These equipments helps minimise laboratory hazard that may occur should Incase it's not available.
Safety goggles, crucible with lid, crucible tong, ring support with clay triangle, Bunsen burner and heat resistant tiles equipment should be ready to start the crucible experiment.
What is crucible?Crucible is having a cup like structure and formed by the mixture of graphite and porcelain, and these two are having very high melting or boiling point; that's why crucible is used to heat any sample at high temperature.
Before doing any experiment with crucible you have to carry:
Safety goggles: In any experiment many kind of chemical used so to protect eyes by that chemicals, this goggles are used.Crucible with lid: It is required to cover the upper open part of crucible.Crucible tong: This is the scissors like tool which is used to carry hot crucible as it is not possible to carry that hot crucible.Ring support with clay triangle: The clay triangle is used to hold crucible when we are doing heating. They usually sit on a ring stand.Bunsen burner: It is used to produces a single open gas flame to produce heat. Heat resistant tiles: It is used to put at the bottom place of the burner.Equipment we should ready to start crucible experiment are safety goggles, crucible with lid, crucible tong, ring support with clay triangle, Bunsen burner and heat resistant tiles.
To know more about crucible, visit the below link:
https://brainly.com/question/5700548
A population’s carrying capacity is the number of individuals that die over a given time period. True or false
Answer:
I believe its false
Explanation:
a carrying capacity is the maximum amount of living things that can be held in a single container
Answer:
Populations vary in their capacity to grow. The maximum rate at which a population can increase when resources are unlimited and environmental conditions are ideal is termed the population's biotic potential. Each species will have a different biotic potential due to variations in
the species' reproductive span (how long an individual is capable of reproducing)
the frequency of reproduction (how often an individual can reproduce)
"litter size" (how many offspring are born each time)
survival rate (how many offspring survive to reproductive age)
There are always limits to population growth in nature. Populations cannot grow exponentially indefinitely. Exploding populations always reach a size limit imposed by the shortage of one or more factors such as water, space, and nutrients or by adverse conditions such as disease, drought and temperature extremes. The factors which act jointly to limit a population's growth are termed the environmental resistance. The interplay of biotic potential and density-dependent environmental resistance keeps a population in balance.
6. How many ions of Na are in 45.6 g of Na2SO4?
Answer:
3.85 ×10²³ Na⁺ ions
Explanation:
Given data:
Mass of Na₂SO₄ = 45.6 g
Number of ions of Na = ?
Solution:
Number of moles of Na₂SO₄:
Number of moles = mass/ molar mass
Number of moles = 45.6 g/ 142.04 g/mol
Number of moles = 0.32 mol
1 mole of Na₂SO₄ contain 2 moles of Na⁺ ion.
0.32 mol × 2= 0.64 moles of Na⁺ ion
1 mole contain 6.022×10²³ Na⁺ ions
0.64 mol × 6.022×10²³ Na⁺ ions / 1 mol
3.85 ×10²³ Na⁺ ions
Which molecule has a dipole moment?
A. Cl2 (linear geometry)
B. H2S (bent geometry)
C. CCIA (tetrahedral geometry)
D. CO2 (linear geometry)
B. I think im probly wrong
I just need the balanced redox equation for the cell using the oxidation and reduction half reactions. PLEASE AND ILL MARK BRAINLIEST!
Answer: For the balanced redox equation, you should add the half reactions.
Like this.
Explanation:
Was it helpful? Or do you need different answer?
What is the answer to this?
A habit is:
pls help me ty
wich of these does the sun provide in large amounts 1.carbon dioxide 2.energy 3.glucose 4.oxygen
Answer:
2. Energy
Explanation:
how to be happy, i miss them
you have to not let your past or your sad thoughts get the best of you.. that what I do i do get sad sometimes but dont let that get u down
Answer:
focus on whats ahead of u, not behind u ok?
Explanation:
hope this helps
What is the velocity of a plane to travel 3000 miles from New York to California in 4.5 hours
Answer:
[tex]velocity = \frac{displacement}{time} \\ v = \frac{3000}{4.5} \\ v = 666.67 \: miles \: per \: hour \\ or \\ v = 666 \frac{2}{3} \: miles \: per \: hour[/tex]
8. Explain how Elianto oil is obtained from maize seeds.
Answer:
Almost all corn oil is expeller-pressed
Explanation:
then solvent-extracted using hexane or 2-methylpentane (isohexane). The solvent is evaporated from the corn oil, recovered, and re-used. After extraction, the corn oil is then refined by degumming and/or alkali treatment, both of which remove phosphatides.Oct 16, 2020
Questions 4-6: Use the following Molar Masses:
H2: 2.02 g/mol Oz: 32.00 g/mol H2O: 18.02 g/mol
5) What mass of oxygen is needed to completely react
with 32.0 g of hydrogen?
2 Hz O2 → 2 H2O
+
32 g H2
х
x
x
= 329 H2
= 1g 42
= 2.02 g H2
= 1 mol H2
* 2.02 mol H2
- 2 mol H2
# 1 mol O2
- 2 mol O2
# 32 mol Oz
3 32 mol O2
=> 32 g 02
- 1 g 02
= 1013 g 02
: 0.248 g 02
253.4 g 02
Answer:
Mass = 253.4 g
Explanation:
Given data:
Mass of oxygen required = ?
Mass of hydrogen available = 32.0 g
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 32.0 g/ 2.02 g/mol
Number of moles = 15.84 mol
Now we will compare the moles of hydrogen and oxygen:
H₂ : O₂
2 : 1
15.84 : 1/2×15.8 = 7.92 mol
Mass of oxygen required:
Mass = number of moles × molar mass
Mass = 7.92 mol × 32.00 g/mol
Mass = 253.4 g
What is the name of the following compound? Se5S6
Answer:
I'm sorry I couldn't find it, I looked all over the internet
Calculate the following:
1. Mass of 4.3x10^-3 mol of lead
2. Mass of 3.8x10^22 antimony atoms
3. Number of atoms in 15.5 kg of tungsten
Answer:
Explanation:
1) Given data:
Number of moles of lead = 4.3×10⁻³ mol
Mass of lead = ?
Solution:
Mass = number of moles × molar mass
Molar mass of lead = 207.2 g/mol
Mass = 4.3×10⁻³ mol × 207.2 g/mol
Mass = 890.96 g
2) Given data:
Number of atoms of antimony = 3.8×10²² atoms
Mass of antimony = ?
Solution:
1 mole contain 6.022 ×10²³ atoms
3.8×10²² atoms × 1 mol / 6.022 ×10²³ atoms
0.63×10⁻¹ mol
0.063 mol
Mass = number of moles × molar mass
Molar mass of lead = 121.76 g/mol
Mass = 0.063 mol × 121.76 g/mol
Mass = 7.67 g
3) Given data:
Mass of tungsten = 15.5 Kg (15.5 kg × 1000 g/ 1kg = 15500 g)
Number of atoms = ?
Solution:
Number of moles of tungsten:
Number of moles = mass/molar mass
Number of moles = 15500 g / 183.84 g/mol
Number of moles = 84.3 mol
1 mole contain 6.022 ×10²³ atoms
84.3 mol × 6.022 ×10²³ atoms / 1mol
507.65 ×10²³ atoms
Scientists did not know about cells before the 1600s because the
microscope had not been invented yet. *
O True
False
How many atoms are there in 4430 grams of lithium (Li)?
Answer:
3843.96 × 10²³ atoms
Explanation:
Given data:
Mass of Li = 4430 g
Number of atoms = ?
Solution:
We will calculate the number of moles first.
Number of moles =mass/molar mass
Number of moles = 4430 g/ 6.94 g/mol
Number of moles = 638.32 mol
1 mole contain 6.022 × 10²³ atoms
638.32 mol × 6.022 × 10²³ atoms / 1 mol
3843.96 × 10²³ atoms
Which of the processes is exothermic?
a) evaporation of alcohol
b) sublimation of iodine
c) solidification of volcanic lava
d) burning of paper
Answer:
Choice C as my opinion
Explanation:
solidification of volcanic lava has to do with changes in earth and the thermal structure that's just a point not sure though
hope I was helpful though thank you
Answer:
c) solidification of volcanic lava
Explanation:
heat is being lost to the outside surroundings "exo" thermic
Following intense exercise, the blood pH was determined to be 7.1. If the HCO3- is 7.5mM and the pKa for HCO3- is 6.1, what is the CO2 concentration in the blood
Answer:
[tex]0.75\ \text{mM}[/tex]
Explanation:
Concentration of [tex]HCO_3^-[/tex] = [tex][HCO_3^-]=7.5\ \text{mM}[/tex]
[tex]pK_a[/tex] for [tex]HCO_3^-[/tex] = 6.1
[tex]pH[/tex] of blood = 7.1
The reaction is as follows
[tex]H_2CO_3+H_2O\rightarrow HCO_3^-+H_3O^+[/tex]
From the Henderson equation we get
[tex]pH=pK_a+\log\dfrac{[HCO_3^-]}{[H_2CO_3]}\\\Rightarrow 7.1=6.1+\log \dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 1=\log\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow 10^1=\dfrac{7.5}{[H_2CO_3]}\\\Rightarrow [H_2CO_3]=\dfrac{7.5}{10}\\\Rightarrow [H_2CO_3]=0.75\ \text{mM}[/tex]
[tex]CO_2(g)+H_2O(l)\rightarrow H_2CO_3(aq)[/tex]
Concentration of [tex]H_2CO_3[/tex], [tex][H_2CO_3]=[CO_2][/tex]
Concentration of [tex]CO_2[/tex], [tex][CO_2]=[H_2CO_3]=0.75\ \text{mM}[/tex].
2055 Q. No. 10^-2
mole of KOH is dissolved in 10 litres of
water. What will be the pH of the solution?
12
Ans: pH = 11
Answer:
11
Explanation:
Moles of KOH = [tex]10^{-2}[/tex]
Volume of water = 10 liters
Concentration of KOH is given by
[tex][KOH]=\dfrac{10^{-2}}{10}\\\Rightarrow [KOH]=10^{-3}\ \text{M}[/tex]
[tex][KOH][/tex] is strong base so we have the following relation
[tex][KOH]=[OH^{-}]=10^{-3}\ \text{M}[/tex]
[tex]pOH=-\log [OH^{-}]=-\log10^{-3}[/tex]
[tex]\Rightarrow pH=14-3=11[/tex]
So, pH of the solution is 11
What is the molarity of a solution that is made by mixing 35.5 g of Ba(OH)2 in 325 mL of solution?
Given :
Mass of Ba(OH)₂ , m = 35.5 g.
Volume of mixture, V = 325 mL = 0.325 L.
To Find :
The molarity of a solution.
Solution :
We know, molarity of a solution is given by :
[tex]M = \dfrac{Given \ Weight}{Molecular\ Mass\times Volume( L ) }[/tex]
We know, molecular mass of Ba(OH)₂ is given by :
M.M. = 171 g/mol
Putting all these values in given equation, we get :
[tex]M = \dfrac{35.5}{171\times 0.325}\ M\\\\M = 0.64\ M[/tex]
Hence, this is the required solution.
Which of these is a harmful interaction
Answer:The five major types of species interactions, summarized in Figure 10, are competition, predation, parasitism, mutualism, and commensalism.
Explanation:
Li2SO4 _____ an electrolyte in solution.
A. Is
B. Is not
Answer:
a
Explanation:
it is an electrolyte because of its strong polar chemical bond
What ratio of nitrogen and hydrogen molecules would result in no left-over reactants? Explain your answer.
Answer:
1:3
Explanation:
nitrogen and hydrogen combine qt high pressure and temperature to form ammonia gas.this method is used to prepare ammonia industrially and the process is called haber's process.
the balanced equation is given as:
N2+3H2=>2NH3
we can see that 1 mole of nitrogen combines with 3 moles of hydrogen to produce 2 moles of ammonia.
hence ratio of nitrogen and hydrogen molecules should be 1:3 for reactants to get used up completely.
I hope it's helpful!
2. How do the ancient Greek model and Ptolemy's model differ?
Answer:
Greek's Model used stars while Ptolemy did not use stars.
Explanation:
The Greek model had stars as part of the system and they revolved around the Earth. Ptolemy's model did not include the stars, but it did include the moons that revolves around the planets.
Suppose you have 2.50 L of a substance with a density of 8.00 g/mL and you want to determine the mass of the substance. The calculation can be broken down into three steps. First, convert the volume from liters to milliliters. Then, determine the mass of the sample in grams. Finally, convert the mass from grams to kilograms. Show the unit analysis by placing the correct components into the unit‑factor slots. The question marks (?) represent the answer to the previous step.
Answer:
20 kg
Explanation:
From the question given above, the following data were obtained:
Volume (V) of substance = 2.50 L
Density (D) of substance = 8.00 g/mL
Mass (m) of substance =?
Next, we shall convert 2.50 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
2.50 L = 2.50 L × 1000 mL / 1 L
2.50 L = 2500 mL
Thus, 2.50 L is equivalent to 2500 mL.
Next, we shall determine the mass of the substance. This can be obtained as follow:
Volume (V) of substance = 2500 mL
Density (D) of substance = 8.00 g/mL
Mass (m) of substance =?
D = m / V
8 = m / 2500
Cross multiply
m = 8 × 2500
m = 20000 g
The mass of the substance is 20000 g.
Finally, we shall convert 20000 g to Kg
This can be obtained as follow:
1000 g = 1 kg
Therefore,
20000 g = 20000 g × 1 kg / 1000 g
20000 g = 20 kg
Therefore, the mass of the substance is 20 Kg
This is not multiptle choice
Sound: Now click the Sound tab.
Part A
On the Sound tab, investigate briefly all the phenomena you explored with water waves above and describe any similarities in your results for sound. Specifically, describe
wave pattern as seen on the screen
shape and amplitude of the graph
effect of frequency on wavelength
effect of frequency on velocity
pattern with two sources
wave pattern with a single-slit barrier
Question 3
Light: Now click the Light tab.
Part A
On the Light tab, once again investigate briefly all the phenomena you explored with water and sound above. Describe any similarities in your results for light. Specifically describe
wave pattern as seen on the screen
shape and amplitude of the graph
effect of frequency on wavelength
effect of frequency on velocity
pattern with two sources
wave pattern with a single-slit barrier
Answer: Sound waves
The wave pattern that i observed in sound waves are longitudinal wave patterns.
The mathematical graph function looks like is a sine function graph. The pattern that i observed in the amplitude of the wave is longitudinal wave pattern
When you increase the frequency of the sound waves the wave moves faster but the wavelength becomes shorter. The higher the frequency results in higher the pitch of the sound.
If you increase the frequency the velocity of the sound wave remains constant for all valuses of frequencies.
i am currently completing this assigment. i am not usre if the answer are correct but i tried my best
I also got this from course hero it's your choise to put the one you want.
The wave pattern is identical to the pattern of the water. The graph is the same as the water except the wave height isn’t as big. Increasing the frequency increases the wavelength. Increasing the frequency also increases the velocity of the waves by a lot. With two sources the waves pass through each other. The wave pattern with a single slit barrier is the same as the water pattern.
Explanation:
Answer: Sound waves
The wave pattern that i observed in sound waves are longitudinal wave patterns.
The mathematical graph function looks like is a sine function graph. The pattern that i observed in the amplitude of the wave is longitudinal wave pattern
When you increase the frequency of the sound waves the wave moves faster but the wavelength becomes shorter. The higher the frequency results in higher the pitch of the sound.
If you increase the frequency the velocity of the sound wave remains constant for all valuses of frequencies.
i am currently completing this assigment. i am not usre if the answer are correct but i tried my best
I also got this from course hero it's your choise to put the one you want.
The wave pattern is identical to the pattern of the water. The graph is the same as the water except the wave height isn’t as big. Increasing the frequency increases the wavelength. Increasing the frequency also increases the velocity of the waves by a lot. With two sources the waves pass through each other. The wave pattern with a single slit barrier is the same as the water pattern.
Explanation:
Calculate the mass of sodium bicarbonate produced bu complete decompostion of 16.8h of nahco3
Answer:what is nacho3???
Explanation:
A similarity ratio of scale factor is the ratio of the lengths of the corresponding of two similar polygons
Answer:
go to hellfhshahahahahahahahahaha aha
Explahhhhahah
The most common source of copper (CuCu) is the mineral chalcopyrite (CuFeS2CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 395 gg of pure CuCu
Answer:
1.14kg of chalcopyrite
Explanation:
In 1 mole of chalcopyrite, CuFeS₂, there is 1 mole of Cu. Thus, to solve this question we need to convert the mass of pure Cu to moles using molar mass (Cu = 63.546g/mol). Then, the moles of Cu are equal to moles of chalcopyrite that must be converted to grams and then to kg (CuFeS₂: 183.54g/mol)
Moles Cu:
395g Cu * (1mol / 63.546g) = 6.216 moles Cu = 6.216 moles CuFeS₂
Mass chalcopyirite:
6.216 moles CuFeS₂ * (183.54g/mol) = 1140.9g
In kilograms:
1140.9g * (1kg / 1000g) =
1.14kg of chalcopyriteDuring the process of condensation, water vapor:____________.
(1) releases 334 J/g of heat energy
(2) releases 2260 J/g of heat energy
(3) gains 334 J/g of heat energy
(4) gains 2260 J/g of heat energy
Answer: (2) releases 2260 J/g of heat energy
Explanation:
Latent heat of vaporization is the amount of heat required to convert 1 mole of liquid to gas at atmospheric pressure.
Latent heat of condensation is energy released when 1 mole of vapor condenses to form liquid droplets.
The temperature does not change during this process, so heat released goes into changing the state of the substance, thus it is called latent which means hidden. The energy released in this process is same in magnitude as latent heat of vaporization. The heat of condensation of water vapour is about 2,260 J/g.
Phase transition refers to the changes in the states of matter between gas, liquids, and solids.
The correct answer is:
Option 2. releases 2260 J/g of heat energy
The process can be explained as:
1. Condensation is the process of conversion of water vapor into the liquid state.
2. Latent heat of vaporization is defined as the amount of heat required for 1 mole of liquid to convert into a gaseous phase at atmospheric pressure.
3. The change in the temperature does not occur during the condensation, and the heat required for the phase transition is latent heat. The heat of condensation of water vapor is 2,260 J/g.
Thus, the correct answer is Option 2.
To know more about condensation, refer to the following link:
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