What pressure is exerted by 0.375 mol of hydrogen gas in a 4.33 L container at 55.0C?
Answer:
47
Explanation:
Write the chemical formula for cobalt (II) bromide. Asp
Answer:
CoBr2
Explanation:
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What is the best choice for cleaning up a water filter used in the filtration of unknown small particles from polluted stream water
Answer:
Reverse Osmosis
Explanation:
Reverse osmosis systems are able to remove more contaminants than carbon, making them a popular choice for many consumers.
I need help I will give crown
Answer:
This is a scientific model.
Explanation:
A scientific model is a representation of systems of ideas, events or processes.
This drawing offers explanations that enables the water cycle to be predicted.
One form of energy can transform into another form of energy.
17 Energy in a flashlight's battery changes from ________ energy to electrical energy.
Answer:
Chemical
Explanation:
Chemical energy is stored in the batteries of a flash light. When the flashlight is used, the Chemical energy that was stored, is then used to make Electrical energy for the flashlight. Then electrical energy is converted to heat in the filament of the flashlight bulb. Some of the heat is lost to the surroundings, and some is converted into light energy.
Continued deforestation will most likely lead to _______. a. a decrease in the number of endangered species b. an increase in the number of endangered species c. an increase in the number of oil and chemical spills d. a decrease in glacial melting please select the best answer from the choices provided a b c d
Deforestation often leads to an increase in the number of endangered species of plants and or animals.
What is deforestation?Deforestation refers to the conversion of forests to non-forest uses. In other words, it is the removal of forest layers for non-forest reasons.
Since forests represent a hotspot for plant and animal biodiversity, their removal automatically means a decrease in biodiversity.
Endangered species are species of plants and animals that are under the threat of going extinct either due to natural or anthropological effects.
Thus, deforestation often leads to an increase in the number of endangered species.
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Answer:
b
Explanation:
9. An empty, massless cube is measured to have all sides equal to 11 cm. It is floating in water and will slowly be filled with sand
that has a density of 3.5 g/cm'. What volume of sand will cause the box to sink?
sink: w cube+w sand>Fb(buoyant force)
w cube = massless = 0
w sand>Fb
w sand > 1000 x 10 x (11/100)³
w sand > 13.31 N
ρgV sand > 13.31
3.5 x 10³ x 10 x V sand > 13.31
V sand = 13.31 : 3.5 x 10⁴ = 3.803 x 10⁻⁴ m³ = 380.3 cm³
Pure water consists of 11. 19% hydrogen by weight and 88. 81% oxygen by weight. what does the law of constant proportions tell you about a 100 g sample of pure water?
Answer:
The law of constant proportion states that the percentage of each compound will stay constant regardless of the source size.
In other words, since 11.19% + 88.81% = 100%, in a 100 gram sample, these percentages will stay the same. In this case, 100% is "equal" to 100 grams.
So, 11.19 grams hydrogen and 88.81 grams oxygen will be present in a 100 gram sample of pure water.
What mass loss would you expect from a reaction between 10.04g of calcium carbonate and 20cm3 of 1m hydrochloric acid
Based on the law of conservation of mass, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
What is the law of conservation of mass?The law of conservation of mass states that for a chemical change occurring, the sum of masses before and after the reaction is constant.
Based on the law of conservation of mass, the reaction between 10.04g of calcium carbonate and 20cm3 of 1m hydrochloric acid will have the same mass before and after the reaction. Any change in mass will be due to evolution of carbon dioxide gas.
Therefore, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
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A way of describing a chemical change that indicates what substances were present before the change and what substances are present after the change is called a _____.
A. chemical equation
B. chemical formula
C. chemical bond
D. All of the above
E. None of the above
Answer:
[tex]\\ \rm\dashrightarrow Chemical\: Equation [/tex]
Explanation:
When a chemical change happens or chemical reaction happens something yields at reactants and something at products
Representing them is called chemical equation
The equilibrium concentrations for the reaction between N2 and O2 to form NO at a certain temperature are given in the table below. What is the equilibrium constant for the reaction?
A. 42
B. 2.4 x 10^-2
C. 4.2 x 10^-4
D. 21
Answer:
c
Explanation:
c is correct i believe
Which salt is produced when sulfuric acid and calcium hydroxide react completely.
Answer:
calcium sulphate and water
Using the rules below,select ALL compounds that are soluble
Answer:
NaNO3 is the answer of given statement
What is the process of removing salt from seawater.
Answer:
Explanation:
Process of desalination is used to remove salt from seawater for provision of fresh water
Treatment of Poison oak
Answer:
Apply cool compresses to the skin. Use topical treatments to relieve itching, including calamine lotion, oatmeal baths, Tecnu, Zanfel, or aluminum acetate (Domeboro solution). Oral antihistamines, such as diphenhydramine (Benadryl), can also help relieve itching.
A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.
A. siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
B. siren wavelength of 0.0068 meters, frequency you hear = 5000 Hz
C. siren wavelength of 0.0068 meters, frequency you hear = more than 5000 Hz
D. siren wavelength of 5000 meters, frequency you hear = 5000 Hz
Answer:
siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
Explanation:
Q.A police siren passes you with a frequency of 5000 Hz. Which correctly describes the sound wave after the police car passes you? The speed of sound is 340 m/s.
(a) siren wavelength of 0.0068 meters, frequency you hear = less than 5000 Hz
(using doppler's effect)
What is the Doppler effect?Doppler effect is the apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.
Who discovered the Doppler Effect?Christian Johann Doppler, an Austrian mathematician, and physicist discovered the Doppler effect in 1842.
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An increase in the population of an organism would most likely be associated with which of the following?
Answer:
An expansion of suitable living space
Explanation:
Increase occurs in the population of the organism only occurs when there is a suitable environment present for that organism. Suitable environment means that place where all the needs of the organism are available such as food, water and shelter etc. If food and water are present in large amount and decrease in animals occurs that prey on that organism will increase the population of the organism.
I'm going to give brainlyest (image below)
Answer:
it stays the same
Explanation:
Even though the volume of water changes as it becomes ice, the mass of the water should remain the same before and after it turns into ice.
What happens during stage 3 of cold water immersion.
Answer:
Stage 3 or long-term immersion hypothermia happens after 30 minutes or more. Cold water pulls heat from the body, and the body’s core temperature drops. This eventually leads to loss of consciousness and death.
d. What is being done to save this species
e. An organization/group that is working towards
Create a commercial that showcases why we should save the manta rays
a. Commercials should be about 30seconds-1 minute. No longer than 30
Answer:
answer
Explanation:
I think it's e hope it right
Which of the following statements is true? Select one: a. A solution is a pure substance. b. A solution is a mixture. c. The solvent is dissolved in the solute. d. A solution has the same properties as a colloid.
Answer:
B
Explanation:
If the ant-lion (predator) population becomes larger than the ant (prey) population what do you think would happen to the population of the ant-lion?
Answer:
It would decrease.
Explanation:
This is because there is not enough food (ant) for the ant-lion group.
What does the number at the end of an element mean? (For example, Hydrogen-3)
Answer:
The top number is the total mass number, particles in an atom of an element that have mass are protons and neutrons.
Explanation:
What is the mass of 11.5 moles of lithium
Answer:
1 moles =6.9g
11.5moles= x
then we have x=79.35g
Iron(|||) chloride can be produced by the reaction shown in the equation
2 Fe + 3 Cl₂ ---> 2 FeCl₃
calculate the maximum mass of iron(|||) chloride(FeCl₃) that can be produced from 11.20g of iron
Relative atomic masses (Ar): Cl =35.5 ; Fe=56
Answer:
Here down below is the equation
Explanation:
Iron (III) chloride can be produced by the reaction shown in this equation:
2Fe +3C2 (arrow) 2FeCl3
Calculate the maximum mass of Iron (III) chloride that can be produced from 11.20 grams of iron?
Relative atomic masses: Cl= 35.5 , Fe =56
The maximum mass of iron(|||) chloride(FeCl₃) that can be produced from 11.20g of iron is 0.069 grams.
What is mass?Mass can be defined as inertia is a quantitative measure of a fundamental feature of all stuff.
It can also be defined as weight is defined as the force exerted by an item while mass is defined as the amount of matter in an object.
The SI unit of mass is kilogram or gram.
Mass can be expressed as
Mass = Given mass of substance / Formula mass
Mass of substance = 11.20 g
Formula mass of FeCl₃ = 162.2
So, mass = 11.20 g / 162.2 g
= 0.069 grams
Thus, the maximum mass of iron(|||) chloride(FeCl₃) that can be produced from 11.20g of iron is 0.069 grams.
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How do you think the light would travel if the laser pointer was 1000 meters away?
20 pnts!!!!!!!!!!!!!!!!!!!!!
It totally depends on the laser power (mW). The divergence of the light is depending on it.
What is a laser?A device that uses stimulated emission of photons from excited atoms or molecules to produce a strong beam of coherent monochromatic light is a laser.
When electrons in optical materials like glass, crystal, or gas absorb energy from an electrical current or light, a laser is formed.
When a 5mW 650 nm laser glows on a white surface in complete darkness, we can see it from 500 to 1 km distant.
Because of the divergence, the projected dot 1 km distant will be a huge dot with a diameter of 20–30 m30 m and will be extremely dim.
Hence,It totally depends on the laser power (mW). The divergence of the light is depending on it.
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What volume (in mL) of 0.750 M sodium hydroxide is needed to neutralize (react with) 275 ml of 0.500 M sulfuric acid (H2SO4)?
NaOH + H2SO4 -> H2O + Na2SO4
I NEED WORK
We know the formula
C1V1=C2V2C is concentration and V is volume
0.750V1=275(0.5)0.75V1=137.5V1=183.34mLThe new volume will be by using the relation between molarity and volume formula.
What is molarity?Molarity, also termed as molar concentration in a solution, is a method of determining how much material is present in a chemical solution.
Calculation of volume with the aid of molarity formula is shown below:
Volume is calculated by using the molarity formula.
[tex]M_{1} V_{1} = M_{2} V_{2}[/tex]
Where, M is molarity and V is volume.
It is given that, [tex]M_{1}[/tex] = 0.750 M , [tex]M_{2}[/tex] = 0.500 M, [tex]V_{1}[/tex] = 275 ml .
Now, put the value of given data in molarity formula.
[tex]M_{1} V_{1} = M_{2} V_{2}\\V_{2} = M_{1} V_{1} / M_{2}\\V_{2} = (0.750 M) (275 ml) / 0.500 M\\V_{2} = 183.34 ml[/tex]
Therefore, the volume will be 183.34 ml.
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express 3.81 meters in inches
Answer:
150 inches.Explanation:
3.81 m. = 150 inches.
I can't find explanation. Hope this is my best!
0.006kg ball is moving 5.0m/s How large is the kinetic energy from this motion?
Answer: times it by 5
Explanation:
CH4(g) + 2O2 (g) →CO2(g) + 2H2O (l), ΔH = -890kj/mol
Calculate much heat is released when 3.5 moles of methane gas undergo a combustion reaction
A combustion reaction is a reaction that reacts with oxygen to produce the product. 3.5 moles of methane release - 3115 kJ/mol of heat.
What is a combustion reaction?A combustion reaction is a chemical reaction that involves the burning of the reactant in the presence of the oxygen molecule to release heat.
The balanced reaction of methane combustion is given as:
CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol
From the reaction, it can be said that 1 mole of methane combusts to produce -890kJ/mol enthalpy.
So, 3.5 moles will produce, 3.5 × -890kJ/mol = - 3115 kJ/mol.
Therefore, 3.5 moles of methane produce - 3115 kJ/mol heat.
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