Answer:
1. 20
2. 32
3. 12
Explanation:
what is filtration? ㅜㅜ ㅜㅜ
Answer:
filtration is the process of using a filter to remove solids from liquids or gasses.
Example:
an example of this is tea.
Is water the only liquid? If not, name 5 more
Answer:
Is water the only liquid? If not, name 5 more
Water, ethanol, household bleach, blood, paint, milk, gasoline, mineral oil, acetone and butyl alcohol are examples of liquids. Liquids' properties allow them to flow or be poured easily into containers, lava
water is not the only liquid.
Answer:
apple juice, milk, smoothie, blood, urine
What is a Difference between absolute temperature and temperature ?
Answer:
Absolute temperature and 100% accurate
Explanation:
Answer:
Absolute temp is measured on a scale in which the hypothetical lowest limit of physical temperatures is assigned the value zero (absolute zero )
Hope this helps <3 Need thanks? Comment /hearthelp
balance this equation
Si Cl4 + H2O → Si (OH4) + HCl
Please give a detailed explanation
Answer:
4HCl + SiO2 → 4H2O + SiCl4
axit clohidric Silic dioxit nước Silic tetraclorua
Axit
Explanation:
Answer:
SiCl4 + 4H2O--->Si(OH4)+4HCl
Explanation:
if you put a 4 in front of H2O it means you will have 8 hydrogens(you multiply 4 by 2) then the oxygens will be 4..on the other side that hydrogen in the brackets holds it's on 4 so that 4 isn't for both the hydrogen and the oxygen...and if you put a 4 in front of the HCl that simply means it's for both the hydrogen and oxygen.
I hope this helps
what is the formula of water
Answer:
The formula of water is H20
What is the pressure of 4 moles of helium in a 50 L tank at 308 K?
Use PV = nRT.
A. 24.64 atm
B. 0.13 atm
O C. 0.51 atm
D. 2.02 atm
Answer:
D
Explanation:
P = Pressure
V = Volume
n = Moles
R = .08206 (because we're using liters)
T = Temperature (as K)
P(50) = (4)(.08206)(308)
P(50) = 101.09792
Divide both sides by 50
P(50)/50 = 101.09792/50
P = 2.0219584
Answer:
[tex]\boxed {\boxed {\sf D. \ 2.02 \ atm}}[/tex]
Explanation:
We are asked to find the pressure of helium gas using the ideal gas law.
[tex]PV= nRT[/tex]
In this formula P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature.
The pressure is unknown and we are solving for it. The volume is 50 liters, there are 4 moles of helium gas, the universal gas constant is 0.08206 L *atm/ mol * K, and the temperature is 308 Kelvin.
[tex]\bullet \ V= 50 \ L \\\bullet \ n= 4 \ mol \\\bullet \ R = \frac {0.08206 \ L * atm}{mol *K}\\\bullet \ T= 308 \ K[/tex]
Substitute these values into the formula.
[tex]P * 50 \ L= 4 \ mol * \frac {0.08206 \ L * atm}{mol *K} * 308 \ K[/tex]
Multiply on the right side. The units of moles (mol) and Kelvin (K) cancel each other out.
[tex]P* 50 \ L = 4 * 0.08206 \ L *atm * 308[/tex]
[tex]P*50 \ L =0.32824 \ L * atm *308[/tex]
[tex]P* 50 \ L = 101.09792 \ L * atm[/tex]
We are solving for the pressure, so we must isolate the variable P. It is being multiplied by 50 liters. The inverse operation of multiplication is division, so divide both sides by 50 L.
[tex]\frac {P* 50 \ L}{50 \ L} = \frac {101.09792 \ L * atm}{50 \ L}[/tex]
[tex]P= \frac {101.09792 \ L * atm}{50 \ L}[/tex]
The units of liters (L) cancel.
[tex]P= \frac{101.09792}{50 } \ atm[/tex]
[tex]P= 2.0219584 \ atm[/tex]
If we round to the nearest hundredth place the 1 in the thousandth place tells us to leave the 2 in the hundredth place.
[tex]P \approx 2.02 \ atm[/tex]
The pressure is approximately 2.02 atmospheres and choice D is correct.
If oxygen causes fire to burn, why didn't the world explode when fire burns at a particular place...since oxygen is everywhere...? Explain...
Answer:
Oxygen does not burn. It is not flammable, but it is an oxidizer.
Explanation
I think you are misunderstanding what is meant by "fire burns up air". Fire does use oxygen when it burns. But it also produces carbon dioxide. An oxygen molecule has two oxygen atoms in it. Fires use this to produce carbon dioxide by adding a single carbon atom from the fire’s fuel (wood, for instance).
hope it'll help:)
If ya could change somethin bout ya previous science classes what would it be?
If I could change something in my previous science classes, it would have been the fact that I struggled in the question concerning exponents. It was simple one, but I don't know how I didn't understood that. For example, if there is a question with a calculation "xy²", then I would first multiply x and y, and then calculate the exponent. I did 3 of the questions wrong because of this, it was when I was in 7th grade. I wish I had not done this kind of silly mistake. I an in 10th grade and understand it well now, though.
When a single salt crystal is added to a cool liquid, large crystals form. Which statement about the original cool liquid is correct?
A) The liquid is a heterogeneous mixture because the crystals can be easily separated from the liquid
B) The liquid is a pure substance because it was made up of a single compound
C) The liquid is a pure substance because it was uniform before the crystal was added
D) The liquid is a homogenous mixture because the substance that formed the large crystals was uniformly dissolved
The liquid is a homogeneous mixture because the substance that formed the large crystals was uniformly dissolved.
A solution is composed of a solute and a solvent. A solution is a typical example of a homogeneous mixture.
We define a solution as any combination of solute and solvent. A solution can be regarded as a homogeneous mixture since the solute is uniformly distributed throughout the solution. The solute and solvent constitutes one phase.
When a salt crystal is added to the solution, crystallization is induced and large crystals of solute form.
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A salt crystal is a cubic form of sodium chloride that is closely bounded together by the reaction of sodium and chlorine ions during electrovalent bonding.
Taking a look at a heterogeneous mixture;
It refers to the mixtures that are not thoroughly mixed and uniform in composition.
On the other hand, homogeneous mixtures are formed when a substance i.e. solute (here, it is the salt crystal) is being added to a cool liquid(solvent) is thoroughly mixed.
From the given information, we are being told that when this single salt crystal is added to the cool liquid, large crystals are formed.
This implies that the formation of large crystals is brought about by the action of crystaliization rendering the liquid to be a homogeneous mixture.
We can therefore conclude that the correct statement about the original cool liquid is in Option D.
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Which of the following is true of science? (2 points)
It can be disproven by philosophy and religion.
It does not change after new evidence is discovered.
It is based on the personal opinions of scientists.
It is based on testable and replicable evidence.
Answer:
It is based on testable and replicable evidence.
Dissolve 27.2 grams of CaO and Fe203 mixture with an excess of 500ml dd HCl 2M. a) Calculate each substance in the original mixture b) Calculate the mass of each anhydrous salt obtained after the reaction
Answer:
nutrion jsbsjsb. wjjshsjs. wjsh
Which of these equations for the
formation of an oxide ion is correct?
0 + 2e" --> 02-
0 --> 02- + 2e
Answer:
A
Explanation:
Because of the cathode
Which atom's ionization energy is greater than that of phosphorus (P)?
A. Ba
B. K
C. As
D. CI
Answer:
Chlorine
Explanation:
the ionization increases as you get closer to the top right. since chlorine (Cl) is the only one of the answer choices that is closer to the top right corner compared to phosphorous (P), that is the answer.
Answer:
cl
Explanation:
because ionization energy decrease from left to right
is a dibasic acid the same as a strong acid
Answer:-
Since all the acid molecules have split into ions, there will be more H+ ions in a strong acid than a weak acid, hence it's pH is lower! E.g. Hydrochloric acid HCl, nitric acid HNO3. If one mole of an acid is neutralised by 2 moles of NaOH, then the acid is dibasic!
What information does the specific heat capacity give about a substance?
A. How much energy is needed to raise its temperature
B. How much heat is released when it changes phases
C. How much energy is needed to overcome an activation energy
O
0
D. How much heat is stored in its chemical bonds
Specific heat capacity tells about how much energy is needed to raise its temperature.
What is specific heat capacity?
Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
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Environmental scientists are unconcerned with methods to preserve natural resources.
Please select the best answer from the choices provided
T
F
Answer:
False
Explanation:
Can someone help me with this please
Answer:
.00305
Explanation:
There a 7 significant figures in the number because we know that leading zeroes are NOT counted. To round the number to have only 3 significant figures, we will need to round to the 5th decimal place. Remember the basic rules of rounding; 5 and up, round up, 4 and below, round down.
.00305346 → .00305
Best of Luck!
Questions: Answer on the following slide.
1. What is needed from adults when conducting experiments at home?
2. Why are chemicals so dangerous?
3. What should always be followed when conducting experiments?
4. What is science?
A report on the various water conservation methods used by any one
states of India
Answer:
Kuls are diversion channels that carry water from a glacier to village. Often spanning long distances, with some over 10 km long, kuls have been around for centuries. They are the lifeline of people of Spiti valley of Himachal Pradesh and in Jammu too.
Kul starts at the glacier, which is to be tapped. Keeping the head clear of debris is achieved by lining the sides of Kul with stones which ensure that there is no seepage or clogging. The Kul leads to the village where the water is stored in a circular water tank. The water is drawn from here are per the need of the village.
Explanation:
Here is a list of some of the traditional water conservation methods that are still in use:
6- the chemical formula of carbonate salt contain monovalent cation is ..........
O XCO3
O X2HCO3
O X2CO3
O X(HCO3)2
7- after adding sodium hydroxide into hydrochloric acid, pH will
O Increases
O decreases
O remains constant
8- the reaction between calcium hydroxide and Nitric acid forming ........
o Ca(NO2)2
O Ca(NO3) O Ca(NO3)2
o Ca(NO2)
Answer:
6-
[tex]{ \sf{XCO _{3} }}[/tex]
because X has only one positive charge.
7-
[tex]{ \sf{increases}}[/tex]
because there is increase in hydroxyl ions which decrease the acidity or hydrogen strength of hydrochloric acid.
8-
[tex]{ \sf{Ca(NO _{3} ) _{2} }}[/tex]
Calcium has a valency of 2 and nitrate ion radicle has valency of 1
what are the disruption of carbon cycle
Answer:
Human activities have a tremendous impact on the carbon cycle. Burning fossil fuels, changing land use, and using limestone to make concrete all transfer significant quantities of carbon into the atmosphere.
PLEASE HELP ME I DONT EVEN KNOW IF I CIRCLES THE RIGHT THING!!
Answer:
why are anime and cartoons awesome? wt..f
Explanation:
I dont got that are you serious or making fun?
for every __sodium ions transported ___postassium ions are transported
Answer:
In fact, in many neurons three sodium ions are transported for every potassium ion; sometimes the ratio is three sodium ions for every two potassium ions, and in a few neurons it is two sodium ions for one potassium ion.
How old is a bone if it presently contains 0.3125g of C-14, but it was estimated to have originally contained 80.000g of C-14?
Half-life of C-14 is 5730 years
The age of the bone is the time taken to decay carbon -14 from a mass of 80 g to 0.3125 g. The decay time is 46209 years. That is the age of the bone.
What is carbon dating?Carbon -14 isotope is radioactive and undergoes nuclear decay by the emission of charged particles. The age of a fossil sample which contains carbon -14 can be determined using the time of decay.
Half life of C-14 = 5730 years
decay constant k = 0.693 / 5730 = 0.00012 yr⁻¹
Initial amount of C-14 = 80 g
final amount = 0.3125 g
Then the time taken to decay 80 g to 0.3125 g is t = 1/k ln (80/0.312)
t = ln (80/0.312) / (0.00012 yr⁻¹)
= 46209 years.
Therefore, the age of the bone is 46209 years.
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Which statement is true?
1. Heat refers to a process.
2. Thermal energy refers to a process.
3. Thermal energy refers to a single particle.
4. Heat refers to a quantity.
Answer:
4. Heart refers to a quantity
Answer:
Heat Refers To A Process
Some animals that live in extremely cold environments protect themselves from freezing by increasing the molality of certain chemicals in their cells. Define molality and explain how it protects these animals.
[tex]\\ \sf \longmapsto m=\dfrac{Moles\:of\:solute}{Wt\:of\:solvent(in\:g)}\times 1000[/tex]
If 45.0 g of O2 are mixed with 45.0 g of H2 and the mixture is ignited, what mass of water is produced?
Group of answer choices
45.0 g
50.7 g
79.9 g
25.3 g
90.0 g
Answer:
45.0gExplanation:
hope it will help you
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what are the useful of carbon dioxide?
Match each step of the scientific method with its matching example.
Match Term Definition
A) The growth of green algae is recorded every day for several weeks and compared
B) The data recorded in the experiment supports the hypothesis about how algae reproduce.
C) Based on what other scientists have done, algae life cycles are affected by light.
D) Under the same temperature and water conditions, green algae is grown under natural light, blue light, and green light.
Experiment
Conclusion
Research
Analysis
Answer: I did the quiz and got it correct
Explanation:
Biosphere- B
Ecosystem- C
Biome- D
Habitat- A
Scientific Method
What is Scientific Method
A method or procedure that consists of systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.
Experiment- The growth of green algae is recorded every day for several weeks and compared
Conclusion- Under the same temperature and water conditions, green algae is grown under natural light, blue light, and green light.
Research-Based on what other scientists have done, algae life cycles are affected by light.
Analysis- The data recorded in the experiment supports the hypothesis about how algae reproduce.
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The chemical elements display periodicity when they're arranged according to
A: Atomic Weight
B: Atomic Mass
C: Atomic Volume
D: Atomic Number
Answer:
HEY YOUR ANSWER IS ATOMIC NUMBER