Answer:
D i belive
Explanation:
The leading couse of air pollution is
Answer:
Wildfires
Explanation:
Calulate the maximum mass of copper that could be obtained from 79.5g of copper oxide
Answer:
63.5 copper
Explanation:
You have the balanced equation: CuO + H2 --> Cu + H2O. You can use stoichiometry and see there is a 1:1 molar ratio between CuO and Cu.
1) work out the moles of CuO.
- mol=mass/mol mass = 79.5g/(63.5+16.0) = 1 mol CuO
2) work out mol Cu
- from the 1:1 mol ratio you know if you have 1 mol CuO you must have 1 mol Cu. So mol Cu=1 mol
3) work out mass of Cu
- mol=mass/mol mass therefore mass= mol x molar mass = 1 x 63.5g/mol-1 = 63.5g Cu
Why did we use phenolphthalein and bromothymol blue in this experiment? What
do each of the colors indicate? What results would you expect for each of the
parts? Justify your answer using CO₂ and its effect on the indicators.
Phenolphthalein is a drab, vulnerable acid that is appreciably used as a hallmark in titration experiments to suggest the endpoint of the titration. The endpoint is indicated with the useful resource of the formation of red color on the grounds that this compound dissociates to shape crimson anions at the same time as dissolved in water.
Titration of an antacid consists of a strong acid-susceptible base titration whose pH at the endpoint is plenty much less than seven. therefore, bromophenol blue rather than phenolphthalein is used as a trademark because the pH range of bromophenol blue is a whole lot less than seven. The pH range of phenolphthalein lies above seven.
The use of CO₂ and its impact on the signs, Phenolphthalein is often used as a hallmark in acid-base titrations. Phenolphthalein is often used as an indicator in acid-base titrations. For this utility, it turns colorless in acidic answers and crimson in simple solutions. It belongs to the elegance of dyes referred to as phthalein dyes.
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Which statement describes what happens in a chemical reaction?
Answer: pic
Explanation:
plz
Answer:
4. matter is neither created nor destroyed
Explanation:
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Facts about Mars
Named after the Roman God of war, Mars is the fourth planet from the sun in our solar system.
Mars is also known as the 'Red Planet' because, well, it's red! ...
Mars is the second smallest planet in the solar system after Mercury.
Answer:
I don't get the question? what am I supposed to be answering? these facts are all true if that's what you're looking for.
Answer:
Thanks
Explanation:
which animal can be both primary and secondary consumers
Homo Sapiens themselves are the primary consumers as they feed on fruits, vegetables, etc.
Also, they are the secondary consumers as they feed on other organisms too like pigs, chickens, etc.
thw table below provides data the length of day for different planets in the solar system
The day length of each planet corresponds to the amount of time it takes to complete which type of motion?
a one rotation of the planet on its as
b one reversal of magnetic poles of the planet
c one revolution of the planet around the Sun
d one orbit of the largest moon of the planet
Answer:
a one rotation of the planet on its axis
Explanation:
The two types of motion that planets undergo are;
1) rotation of the planet about its axis
2) revolution of the planet around the sun.
In every planet there are days as shown in the image attached to the question. However, the length of day in each planet is determined by the time required for the planet to complete one rotation on its axis.
It takes the earth 1 earth day (24 hours) to complete rotation on its axis.
Planets that orbit farther away from the Sun than Earth have ____ years than we do.
Cl2 +
NaBr
what’s this answer?!
Why is the aqueous environment of a cell important?
It prevents organelles in a cell from sticking together.
It allows cells to bend and change shape as needed.
It provides a constant energy source for a cell. I
t's required for all chemical reactions in a cell.
Answer: it's required for all chemical reactions in a cell.
Explanation: took the test. please vote :-)
The aqueous environment is vital for cellular functions, facilitating chemical reactions, maintaining structure, and enabling cellular processes.
Option (D) is correct
The aqueous environment within a cell, primarily composed of water and various dissolved molecules, plays a crucial role in cellular processes. It enables and supports a multitude of chemical reactions necessary for cellular metabolism, growth, and maintenance.
Water's solvent properties allow biochemical reactions to take place, aiding in nutrient transport, waste removal, and cell signaling. Moreover, water's cohesive and adhesive forces contribute to maintaining cellular structure and preventing organelles from sticking together, ensuring proper compartmentalization and functioning.
While it does not provide energy directly, the aqueous environment indirectly sustains cellular energy processes by facilitating reactions within the cell. Additionally, the fluidity of the aqueous environment enables cells to change shape, promoting functions such as migration, phagocytosis, and division.
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The complete question is:
Why is the aqueous environment of a cell important?
A) It prevents organelles in a cell from sticking together.
B) It allows cells to bend and change shape as needed.
C) It provides a constant energy source for a cell. I
D) t's required for all chemical reactions in a cell.
during which two processes does a substance release energy
a) freezing and condensation
b) freezing and melting
c) evaporation and condensation
d) evaporation and melting
Answer:
a) freezing and condensation
Explanation:
During Freezing and condensation , substance release energy because these both are exothermic reactions.
What is freezing?The phase shift of a material from a liquid to a solid form is referred to as freezing. For example water changes to ice.This is a phase transition phenomena, which occurs when a substance changes from one state of matter to another.What is condensation?Condensation is the transformation of water vapour into liquid water. For example fluffy clouds floating over your head. When the water droplets in clouds mix, they become heavy enough to pour down on your head.What are the exothermic reactions?A process in which energy is emitted in the form of light or heat is known as an exothermic reaction. As a result, rather of absorbing energy from the surroundings as in an endothermic reaction, energy is transferred into the surroundings in an exothermic reaction. The change in enthalpy (H) in an exothermic process is negative.Hence, the correct option is A.
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What Is the atomic mass of the element shown? 14 Si silicon 28.1
A. 56
B. 14
C. 42.1
D. 28.1
Answer:
28.1
Explanation:
plez give me brainliest
An 85.0 kg patient being treated for a serious infection is to receive an iv infusion of 1 /mg kg gentamicin, a powerful antibiotic. the pharmacy has prepared a 250. ml iv bag of normal saline in which 0.500 g of gentamicin has been dissolved. what is the total volume of the iv solution that should be given to the patient? round your answer to the nearest ml
Answer: 1/ms=8mk
Explanation:
If I have a 30,000 mL container that holds 65 moles of gas at a temperature of 205 degrees Celsius, what is the pressure inside the container?
Answer:
85.384 atm or 64608.13086 mmHg
Explanation:
PV= NRT
P= NRT/V
n= mols
R= gas constant (i used .0821 for atm)
T= Temp in Kelvins (Celsius degrees + 273)
V= in L
(65molsx480kx.0821)/30L
Help a man out I just gotta pass
Answer:
D.
Explanation:
Honestly not sure just a guess
If an isotope has 85 protons, 110 neutrons, and 85 electrons, it has a mass number of what?
Answer:
Mass number = 195
Explanation:
Isotope:
An atom of an element that contain same atomic number but different atomic mass.
The difference in atomic mass is due to the different number of neutrons present, but the number protons and electrons are remain same.
In given isotope of an atom there are 85 protons and 85 electrons while number of neutrons are 110.
The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.
Mass number = number of protons + number of neutrons
Mass number = 85 + 110 = 195
When should you avoid looking directly at magnesium burning?
Answer:
Magnesium also reacts with nitrogen in the air to produce some magnesium nitride (Mg3N2). Safety: Do not look directly at the burning magnesium due to the intensity of the light. A dry-powder fire extinguisher should be available. Disposal: Once cooled the solid magnesium products can be thrown in the trash.
Explanation:
5.
This ancient element symbol
means ...
A. copper
B. silver
c. gold
D. tin
Answer:
A im pretty sure
Explanation:
Write one equation each for the decomposition reactions where energy is supplied in the form of (a) electricity and
Answer:
Electrolysis of water
Explanation:
The electrolysis of water is a decomposition reaction in which electricity is used to break down a compound into simpler molecules.
Decomposition of water is carried out in the Hofman Voltameter.
This process is achieved by passing current through an acidified water.
The expression is given as:
2H₂O → 2H₂ + O₂
Which cells carry nutrients from food to the rest of the cells in the body?
Responses
blood cells
stomach cells
nerve cells
muscle cells
Answer:
Blood Cells
Explanation:
Capillaries are so small that blood cells can only move through them one at a time. Oxygen and food nutrients pass from these capillaries to the cells. Capillaries are also connected to veins, so wastes from the cells can be transferred to the blood.
Label each of the following properties of sulfur as either á physical or chemical property.
Use the definition of a physical property and chemical property to back up your answer.
1. It reacts with hydrogen when heated
2. It is a yellow solid at room temperature
3. It is soluble in carbon disulfide
4. Its density is 2.97 g/cm3
5. It melts at 113°C
Answer:
Explanation:
1. It reacts with hydrogen when heated
Chemical property
2. It is a yellow solid at room temperature
Physical property
3. It is soluble in carbon disulfide
Chemical property
4. Its density is 2.97 g/cm3
Physical property
5. It melts at 113°C
Physical property
Physical properties tells us everything about what substance is when no change is occurring to its constituents.
It can be observed using apparatus and instruments. Examples are state of matter, color, odor, taste, texture, hardness, solubility in water, density, melting point and boiling point
Chemical properties are those properties that tell us about what a substance can do as regards to whether or not the substance reacts with other substances. Examples are flammability, rusting of irons, precipitation, decomposition of water by an electric current.
Cleaning agents are complex mixtures of chemical components, each with its own specific purpose. The components have very precise measurements to ensure that the cleaning agent has the right properties. What is a cleaning agent an example of? (Hint: it's a type of mixture).
The components have very precise measurements to ensure that the cleaning agent has the right properties which means it is an example of a homogeneous mixture.
What is homogeneous mixture?
A mixture is referred to as a substance which comprises of two or more different chemical substances which are not chemically bonded and are of two types which are:
Homogeneous mixture.Heterogeneous mixture.The homogeneous mixture is a type of mixture in which there is the same or uniform proportions of its components in the sample while heterogeneous mixture doesn't have a uniform proportion.
In this scenario, we were told that the components have very precise measurements with the right properties which depicts a homogeneous mixture and is the correct choice.
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Rutherford tested the ____________ atomic model by experimentation and found that it was _____________.
a. Nuclear; correct
b. Bohr; correct
c. Plum Pudding; incorrect
d.Dalton; incorrect
Answer:
C Plum Pudding; incorrect
Explanation:
Ernest Rutherford tested it through his famous gold foil experiment and found that it was incorrect.
Fe(s) + S(s) → FeS(s)
In one experiment, 7.62 g of Fe are allowed to react with 8.67 g of S.
What is the limiting reagent, and what is the reactant in excess?
Calculate the mass of FeS formed.
The mass of FeS formed : 11.97 g
Further explanationReaction
Fe(s) + S(s) → FeS(s)
mass Fe=7.62 g
mol Fe(MW=56 g/mol) :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{7.62}{56}\\\\mol=0.136[/tex]
mass S=8.67 g
mol S(MW=32 g/mol) :
[tex]\tt mol=\dfrac{8.67}{32}=0.271[/tex]
Limiting reactant : smaller ratio(mol:coefficient) ⇒coefficient=1
Fe : S =0.136 : 0.271⇒Fe limiting(smaller), S excess
Mol FeS based on Fe , so mol FeS=0.136
Mass FeS(MW=88 g/mol) :
[tex]\tt mass=mol\times MW\\\\mass=0.136\times 88=11.97~g[/tex]
Please help will mark the brainliest.
Answer:
A 1.69%
i hope its right i worked it out
how many moles of h2o are produced when 3.25 moles of o2 react in 2c2h6 + 7o2 ---> 4co2 + 6h2o
Answer:
2.78 moles of water are produced.
Explanation:
Given data:
Number of moles of H₂O produced = ?
Number of moles of oxygen react = 3.25 mol
Solution:
Chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Now we will compare the moles of water with oxygen.
O₂ : H₂O
7 : 6
3.25 : 6/7×3.25 = 2.78 mol
How many milliliters of a stock solution of 6.20 M HNO3 would you have to use to prepare 0.130 L of 0.470 M HNO3?
Answer:
9.85
Explanation:
M1V1 =M2V2
6.20×v1= 0.470×0.130
v1 = ( 0.470 × 0.130 ) ÷ 6.20
v1 = 0.0098 L × 1000
V1 = 9.8 ml
Who is the kingdom of plants?
Answer:
i think you mean what is the kingdom of plants, but its "Kingdom Plantae".
Kingdom Plantae traits: eukaryotic/have nucleus, multicellular and autotrophic. (they photosynthesis)
2nd largest kingdom
Answer:
Introduction: All the plants are placed in the Kingdom- Plantae, according to the five-kingdom classification by R.H. Whittaker. The Kingdom- Plantae consists of multicellular plants with eukaryotic organization and chlorophyllous cells.
Explanation:
What is the kingdom for plants called?
What are the 3 plant kingdoms?
Kingdom Plantae Organisms
Ferns: They fall under the division Pteridophyta and are known to have vascular tissue. ...
Mosses: They fall under the division Bryophyta and have no vascular system. ...
Cone-bearing plants: They fall under the division Spermatophyta, sub-division gymnosperms
3. A polyatomic ion is formed from more than one atom.
True or false
Answer:
true
Explanation:
Which of the following describes Rutherford's model of the atom? (1 pt)
*
1 point
solid sphere like a marble but unique to the element it makes
numerous positive charges floating around in a sea of negative charge (plum pudding)
positive nucleus surrounded by a blob of negative charge
positive nucleus surrounded by electrons in circular orbits
positive nucleus surrounded by electron orbitals with complex 3-D shapes and assigned energies.
Rutherford model of the atom states that positive nucleus surrounded by a blob of negative charge.
What is Nucleus ?
The positively charged area at the centre of each atom is known as the nucleus .
It is made up of two different subatomic particle kinds that are closely clustered.
Protons, which have a positive electric charge, and neutrons, which have no electric charge, are the particles.
According to Rutherford's theory, an atom's nucleus is surrounded by electrons that are negatively charged.
He also asserted that the electrons that surround the nucleus travel in a circular pattern at extremely high speeds. He gave these elliptical routes the name orbits.
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