Answer:
Joints are movable connections between two bones. ... It provides a smooth surface to stop the bones in the joint from rubbing against each other too much. The cartilage passes the pressure in the joint on to the bone underneath it. This is especially important in joints that bear heavier loads, such as hip or knee joints
Explanation:
A doorbell uses an electromagnet for its operation.
Question 7 options:
True
False
Explanation:
The heart of the doorbell is an electromagnetic so yeah it does.
What prediction can the student make about the new substances properties? A. The resulting substance will not have any chemical or physical properties in common with the elements that make it up. B. The resulting substance may have different chemical and physical properties than the elements that make it up. C. The substance should be colorless and a gas at room temperature, like hydrogen and oxygen. D. The resulting substance should be black and a solid at room temperature, like carbon.
Answer:
B
Explanation:
The resulting substance may have different chemical and physical properties than the elements that make it up.
The prediction can the student make about the new substances properties is the resulting substance may have different chemical and physical properties than the elements that make it up. Thus, option B is correct.
Physical and chemical changes are two different types of changes that can occur to matter. A physical change is a change in the form or appearance of a substance, but the chemical composition of the substance does not change. A chemical change is a change in the chemical composition of a substance, resulting in the formation of a new substance.
When wood burns, it reacts with oxygen in the air to form carbon dioxide and water vapor. The chemical composition of the wood changes, and a new substance is formed.
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NaOH + H₂SO4 -> Na2SO4 +H20 balance the equation
Answer:
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Explanation:
NaOH + H₂SO4 -> Na2SO4 +H2O
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Answer:
2NaOH + H₂SO4 -> Na2SO4 + 2H2O
Explanation:
2*H+2H=2*2H
2*Na=Na2
2*O+O4=O4+2*O
s=s
Digital communication plays a very important role in modern living. Effective transmission of data, voices and images in a digital format requires a suitable material. What is the material?
Answer:
The answer is fibre optic.
Explanation:
Fibre optic is used for Effective transmission of data, voices and images in a digital format.
this is not chemistry this is science
Answer: 2 meters
Explanation: 200 cm of flower bed
There are 100 cm in one meter.
200/100=2
Answer:
200 centimeters or 2 meters
Explanation:
It should be the same simply for aesthetic pleasure
I want to see how smart y'all are fwee points
What is a physical and chemical change?
Answer:
Physical change is basically a change in where an object can easily return to its original state somehow as long as it’s possible but a chemical change is a change in which there is now simple way to change a substance back to original form. Basically (in simple words) chemical changes literally make something entirely new.
Explanation:
Physical changes come for example when you rip paper. You can easily fix it right up with some tape.
Chemical Changes is like rust on a bike or paper being burned. If that paper bein burned in flames you can’t put tape on the ashes and start writing on it like nuthin happend lol
How many moles of ions are produced from dissociation of 1 mol of NH4Br
Answer:
2 mol
Explanation:
NH4Br = NH4+ + Br-
1 mole of NH4+ and 1 mole of Br.
How many atoms of each element are in the following chemical reaction
3 H3PO4 + 3 KOH
Answer: K3PO4+3H2O.
Explanation:
H- 12
P- 3
O- 15
K- 3
(You need to multiply the subscript by the number in front of each compound, then add the number of each element in each of the compounds. Lmk is you need a better explanation)
A gas phase mixture of H2 and N2 has a total pressure of 784 torr with an H2 partial pressure of 124 torr. What mass of N2 gas is present in 2.00 L of the mixture at 298 K
The mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g
We'll begin by calculating the partial pressure of N₂. This can be obtained as follow:
Total pressure = 784 torr
Partial pressure of H₂ = 124 torr
Partial pressure of N₂ =?Total pressure = Partial pressure of H₂ + Partial pressure of N₂
784 = 124 + Partial pressure of N₂
Collect like terms
Partial pressure of N₂ = 784 – 124
Partial pressure of N₂ = 660 TorrNext, we shall determine the number of mole of N₂ in the mixture.Pressure of N₂ (P) = 660 Torr
Volume (V) = 2 L
Temperature (T) = 298 K
Gas constant (R) = 62.364 L.Torr/Kmol
Number of mole of N₂ (n) =?PV = nRT
660 × 2 = n × 62.364 × 298
1320 = n × 18584.472
Divide both side by 18584.472
n = 1320 / 18584.472
n = 0.071 moleFinally, we shall determine the mass of N₂ in the mixture.Mole of N₂ = 0.071 mole
Molar mass of N₂ = 2 × 14 = 28 g/mol
Mass of N₂ =?Mass = mole × molar mass
Mass of N₂ = 0.071 × 28
Mass of N₂ = 1.988 gTherefore, the mass of N₂ in the mixture having a total pressure of 784 torr with an H₂ partial pressure of 124 torr is 1.988 g
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You work in an analytical testing lab and have been asked by your supervisor to purchase new pH meters to replace your old supply. You have identified four potential suppliers and now need to evaluate the performance of each pH meter.
You obtained a solution with a known pH of 5.5. You performed 10 replicate
measurements of the pH of that known solution using each of the four different pH meters and obtained the data shown below.
All other factors being equal (cost, ease of use, etc), which brand would you suggest the lab purchase? Explain your reasoning.
The pH meter brand B is the most accurate pH meter as compared to other pH meter.
I will suggest the pH meter brand B the lab to purchase because the readings of this pH is more accurate as compared to other three pH meters. The pH meter brand B provides data which is closer to the known pH of the solution.
While on the other hand, pH meter brand A, C and D gives less accurate data in which more error is present in the data so we can conclude that the pH meter brand B is the most accurate pH meter as compared to other pH meter.
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Which are examples of a phase change? (Select all that apply.)
evaporating water
cutting wood
frying eggs
melting butter
Answer:
melting butter and frying eggs
Explanation:
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What is one common boating hazard in Sydney Australia
Answer:
seals
Explanation:
The Law of Multiple Proportions states that if two elements can combine to form two different compounds, the masses of the one element that can combine with a fixed amount of the other element will be in a ratio of small whole numbers.
True False
Answer:
law of multiple proportionsA law stating that if two elements form a compound, then the ratio of the mass of the second element and the mass of the first element will be small whole number ratios.
Explanation:
Consider this reaction involving an unknown element X. F2+2XBr⟶Br2+2XF When 1.300 g of XBr reacts, 0.7241 g of Br2 is produced. Calculate the molar mass of X, and then identify its element symbol.
The molar mass of X would be 63.55 g/mol and the chemical symbol of X would be Cu (copper).
From the equation of the reaction: F2+2XBr⟶Br2+2XF
The mole ratio of XBr to Br2 is 2:1
Mole of Br2 = mass/molar mass
= 0.7241/159.808
= 0.004531 mole
Mole of XBr = 2 x mole of Br2
= 2 x 0.004531
= 0.009062 mole
Molar mass of XBr = mass/mole
= 1.300/0.009062
= 143.456 g/mol
Since the molar mass of Br is 79.904, the molar of X would be:
143.456 - 79.904
= 63.55 g/mol
Hence, X would be Cu.
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What is the process when oceans and lakes collect water that has fallen (water cycle)
The water cycle is the endless process that connects all of that water. It joins the Earth's oceans, land, and atmosphere. The Earth's water cycle began about 3.8 billion years ago when rain fell on a cooling Earth, forming the oceans. ... Precipitation that falls onto land flows into rivers, streams, and lakes.
The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor.
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Please please help please help me please please help me
Answer: the left group is the alkali metals while in the right side its the halogens... up to you to pick. either A or D
Explanation:
at room temp, water is a liquid, but carbon dioxide is a gas. both compounds are molecules made of three atoms. what difference at the molecular level helps explain why water is a liquid and carbon dioxide is a gas at the same temp?
Explanation:
Water has relatively strong hydrogen bonds holding the molecules together but CO² has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO² is a gas whereas H²O is a liquid at room temperature.
Answer: Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature.
Explanation: I hope it helps you!
The compound made of chlorine and oxygen that has been used to kill anthrax spores in contaminated buildings is 52.6% Cl. What is its empirical formula
This problem is describing the percent composition of a compound formed by chlorine and oxygen, whereas the former has a percent composition of 52.6 % and asks for the empirical formula.
In this case, according to the given information, it turns out firstly possible to realize, that the percent composition of oxygen will be 47.4 % as both must sum 100 %.
Next, for the determination of the empirical formula, we can assume this percents as masses, to calculate the moles of each atom in the formula:
[tex]n_{Cl}=52.6gCl*\frac{1molCl}{35.45gCl}=1.484molCl\\\\n_{O} =47.4gO*\frac{1molO}{16.0gO} =2.963molO[/tex]
After that, we divide the moles of both Cl and O by 1.484 (moles of Cl), in order to calculate the mole ratios which also provide the subscripts in the empirical formula:
[tex]Cl:\frac{1.484}{1.484}=1\\\\O:\frac{2.963}{1.484}=2[/tex]
Hence, the formula is:
[tex]ClO_2[/tex]
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https://brainly.com/question/20053584https://brainly.com/question/2070746A hot air balloon is filled with 1.19 x 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 113 °C. What is the
volume of the air in the balloon after it is heated? Assume that none of the gas escapes from the balloon.
Answer:
using the Charles law
v1/t1= v2/t2
Explanation:
1.19* 10^6/11+273=v2/113+273
1.19*10^6/284=v2/386
v2= 1.19*10^6/284/386
v2= 10.89L
What are the first 20 elements and their abbrevations
Answer:
1. Hydrogen (H)
2. Helium (He)
3. Lithium (Li)
4. Beryllium (Be)
5. Boron (B)
6. Carbon (C)
7. Nitrogen (N)
8. Oxygen (O)
9. Fluorine (F)
10. Neon (Ne)
11. Sodium (Na)
12. Magnesium (Mg)
13. Aluminum (Al)
14. Silicon (Si)
15. Phosphorus (P)
16. Sulfur (S)
17. Chlorine (Cl)
18. Argon (Ar)
19. Potassium (K)
20. Calcium (Ca)
Which of the following best describe arrangement of particles in a gas?
The particles are packed closely together and cannot move freely
The particles are spread apart and can move freely.
The particles are packed closely together and can move freely
Answer:
last one
Explanation:
makes the most sense
4. Find the value of Y in AU. HINT: Convert the km to AU using: 1AU = 150 MILLION kilometers
The diagram below shows the position of the sun and two galaxies, G1 and G2. The distance between the two galaxies is represented by Y.
600 billion km
SUN
G1
G2
400 billion km
OVS
What is the value of Yin AU? (3 points)
The value of Y in AU for the distance between the sun and the two galaxies is 1,333.3 AU.
The given parameters;
position of the sun, G1 = 600 billion kmposition of OVS, G2 = 400 billion kmThe distance between the sun and the two galaxies is calculated as follows;
Y = 600 billion km - 400 billion km
Y = 200 billion km
150 million km = 1 AU
200 billion km = ?
[tex]\frac{1 \ AU}{150 \times 10^6 \ km} \times 200 \times 10^9 \ km= 1,333.3 \ AU[/tex]
Thus, the value of Y in AU for the distance between the sun and the two galaxies is 1,333.3 AU.
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Due tomorrow: What element is in group 18, period 1
Answer: helium
Explanation: it’s in the very last column (group) and the first row (period)
HELP 100 POINTS GIVING BRAINLIEST
Answer:
it is the answer
Explanation:
Six hundred men, six hundred men under my command
With only one goal in mind
Make it back alive to our homeland
Six hundred men, six hundred miles of open sea
But the problem's not the distance
It's what lies in between
And Ithaca's waiting Ithaca's waiting
My kingdom is waiting The kingdom is waiting
Penelope's waiting for me
So full speed ahead, full speed ahead
During a class presentation, your classmate explains that plants perform photosynthesis and animals perform cellular respiration. In your own words, describe what these processes are and explain why your classmate’s statement is correct or incorrect. will give brain
Answer:
During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil. ... This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.
If 79.5 mol of an ideal gas is at 8.91 atm at 47.20 °C, what is the volume of the gas?
Answer:
235L
Explanation:
PV =nRT
V = nRT/P
47.20 °C is 320.35K
V = (79.5 mol)(0.0821 atm•L/mol•K)(320.35K)/8.91atm
V = 234.6698577L
Round to 3 sig figs: 235L
Which is NOT a correct assumption related to the Kinetic Theory?
A) collisions are perfectly elastic
B) a gas is composed of particles relatively far apart from one another
C) particles in a gas move in random motion
D) intermolecular forces influence the properties a gas
E) None of all
F) no attractive or repulsive forces exist between the particles
Answer:
D
Explanation:
i took the test and got it right :)
The nucleus of a atom is
What is accumulation??
Answer:
Accumulation is something that's building up. For example, "My trash accumulates every Saturday."
10. The molar mass of an unknown gas was measured by an effusion experiment. It was found that it took 63 s for the gas to effuse, whereas nitrogen gas (N2) required 48 s. The molar mass of the unknown gas is closest to- A) 24 g/mol B) 37 g/mol C) 16 g/mol D) 32 g/mol E) 48 g/mol
Answer:
chu papi
Explanation:
