Answer:
A cell membrane. A cell structure that controls which substances can enter or leave the cell. (found in all cells) In cells with cell walls, the cell membrane is located just inside the cell wall. In other cells, the cell membrane forms the outside boundary that separates the cell from its environment.
Hope this helps!
How much percent of the earth is water?
Answer:70%
Explanation:
Answer:
71%
Explanation:
71% of the earth is covered by water and oceans hold about 96 percent of the water
Where is the blood first filtered?
W
X
Y
Z
Answer:
in w
Explanation:
first blood enter renal artery which enter glomerous( where blood is filtrated) and then to Bowman carpusle(take the filtrated blood)
and then to proximal tubular(absorbed salt) and then to loop of hanle (y)(absorb water) and then to distal tubule then to ureter (z) and then to renal vein(x)(to go to urinary bladder)
Explain how atomic interactions determine a material to be transparent and opaque
Answer:
The materials are opaque or crystalline from a client to the orientation and type of union between their atoms, forming two types of structures.
These two structures can be crystalline or amorphous.
In the case of being crystalline, these unions do not allow light to pass through the medium of the object or body of said compound, making it totally refract and giving the appearance of OPAQUE.
On the other hand, in those compounds that we call amorphous, the atoms are located in a different way that makes light pass through them, without absorbing or identifying any light beam, so they look transparent.
Explanation:
Example: A glass cup has an amorphous structure, while a porcelain or porcelain plate has a crystalline structure.
HELP PLEASE You may select a topic from the list below, or choosese a topic about our solar system
Answer:
ok i see it
Explanation:
Answer: the planets, gravity, the galaxies
Explanation:
Write anything you want about it .
For example, there are 8 planets and their names
A sample of carbon dioxide occupies a volume of 1.50L at 165KPå pressure. What pressure would the gas exert if the volume was increased to
2.5L?
a.0.023 kPa
b. 275 kPa
c. 99 L
d. 99 kPa
Answer:
B. 275 kPa
Explanation:
Since we need to find the greater value, because 1.50<2.5, then the only greater value would be 275 kPa.
which term names a small icy object that orbits the sun?
Answer:
It a comet
Explanation:
that why they are also called dirty snowballs
Answer:
A comment
Explanation:
Because I took the test and that 100 and because comets are icy and sometimes lead tale of water droplets behind them
What type of element is generally largest
Answer:Hydrogen
Explanation:is the most abundant element in the universe (75%by weight or 88% of all of the atoms of the universe)
9. Mangnesium can form compounds by acting with different oxidation numbers (2-, 3+, 4+, 6+, 7+). Argue your answer.
a) Which of the following species can act as oxidizing agents?
b) Which ones as reducing agents?
a) Mn2 +
b) MnO2
c) MnO-4
d) NnO2-4
e) Mn (OH) 2
Please help with questions 7-12
Answer:
negitive 5 or -5
Explanation
usally 12-7 = 5 but 7 is first so it you turn 5 to negitive 5
or -5
For the reaction: 2 H3PO4 + 3 Ca(OH)2 → Ca3(PO4)2 + 6 H2O If you have 59.8 mL of 1.60 M phosphoric acid, how many mL of 0.500 M calcium hydroxide do you need to neutralize the acid?
Answer:
V = 127.57 mL
Explanation:
In this case, we are having an acid base titration, and this, according to the overall reaction:
2H₃PO₄ + 3Ca(OH)₂ -----> Ca₃(PO₄)₂ + 6H₂O
This reaction was neutralized, so, it's a neutralization reaction, therefore, we can use the following expression for neutralization reactions:
n₁ = n₂ (1)
This is because, in the equivalence point, both moles of the reagents are the same. Now we need to do a relation between this and the actual moles that we have according to the overall reaction.
In this case, we have 2 moles of acid reacting with 3 moles of base, so, the equation (1) is re-written like this:
2n₁ = 3n₂ (2)
Knowing this, and that we have values of concentrations and volume, we can write the expression of moles in terms of molarity and volume:
n = M * V replacing in (2):
2M₁V₁ = 3M₂V₂ From here, we can solve for V₂ which is the volume of the base:
V₂ = 2M₁V₁ / 3M₂ (3)
Now, all we have to do is replace the given values to obtain the volume of the base:
V₂ = 2 * 1.6 * 59.8 / 3 * 0.5
V₂ = 127.57 mLAnswer:
[tex]V_{Ca(OH)_2}=0.287L=287mL[/tex]
Explanation:
Hello,
In this case, given the reaction:
[tex]2 H_3PO_4 + 3 Ca(OH)_2 \rightarrow Ca_3(PO_4)_2 + 6 H_2O[/tex]
We first compute the moles of phosphoric acid that are actually reacting given the volume (must be in litres) and the molarity:
[tex]n_{H_3PO_4 }=1.60\frac{mol}{L}*59.8mL*\frac{1L}{1000mL} =0.0957molH_3PO_4[/tex]
Next, we compute the moles of calcium hydroxide that are reacting by using the 3:2 molar ratio with phosphoric acid:
[tex]n_{Ca(OH)_2}=0.0957molH_3PO_4*\frac{3molCa(OH)_2}{2molH_3PO_4} =0.144molCa(OH)_2[/tex]
Finally, by knowing the 0.500 M of the calcium hydroxide solution we compute the required volume:
[tex]V_{Ca(OH)_2}=\frac{n_{Ca(OH)_2}}{M_{Ca(OH)_2}}=\frac{0.144mol}{0.500\frac{mol}{L} } \\ \\V_{Ca(OH)_2}=0.287L=287mL[/tex]
Best regards.
What Newton’s law is this a example of:
When a bullet is fired from a rifle through a small explosion. The rifle shooting the bullet is pushed backwards after the explosion.
Answer:
Newton's third law
Explanation:
every action has an equal and opposite reaction.
* I’ll give you BRAINLIST * ( have to get it right ) Joshua has learned that the human body is made up of many body systems that work together to function for life. Which of the following does NOT
provide an example of two human body systems working together?
Answer:
Kidney & lungs
heart & bladder
bladder & lungs
Explanation:
HOPE THIS HELPS
If you made 6 moles of NO2 how many grams of N2 did you use?
Answer:
3
Explanation
N is 14, so multiply it by 6 (because 6 moles). Since it's N2, divide it by 2, then divide it by 14 (N in grams).
State duplet rule .
If matter is neither created nor destroyed, why can’t we just go directly from grams of reactant to grams of product?
According to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
What is chemical reaction?Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. When atoms establish or break chemical bonds, chemical reaction take place.
Law of conservation of mass is defined as a chemical reaction requires that the total mass of the reactants and products be equal. Law of conservation of mass also stated that mass is always conserved throughout chemical reactions and cannot be created or removed.
Thus, according to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.
To learn more about law of conservation of mass, refer to the link below:
https://brainly.com/question/28711001
#SPJ6
How many grams of CO2 are produced from the burning of 1.0 mol of amyl alcohol, C5H11OH?
Answer:
220g of CO2
Explanation:
Step 1:
The balanced equation for the reaction.
2C5H11OH + 15O2 —> 10CO2 + 12H2O
Step 2:
Determination of the number of mole of CO2 produced by burning 1 mole of C5H11OH.
From the balanced equation above,
2 moles of C5H11OH produced 10 moles CO2.
Therefore, 1 mole of C5H11OH will produce = (1 x 10)/2 = 5 moles of CO2.
Therefore, 5 moles of CO2 is produced from the reaction.
Step 3:
Conversion of 5 moles of CO2 to grams.
Molar mass of CO2 = 12 + (2x16) = 44g/mol
Number of mole of CO2 = 5 moles
Mass of CO2 =...?
Mass = mole x molar mass
Mass of CO2 = 5 x 44
Mass of CO2 = 220g.
Therefore, 220g of CO2 were obtained from the reaction.
Could u please balance this equation
Explanation:
I don't know how to explain
please help its due today..!
Answer:
This all should be correct:
c
a
c
a
Answer:
C, A, B, B
Explanation:
Question 1: C. inner core
Why? Because the inner core is literally the center of the Earth. Meaning it is the hottest part of the Earth.
Question 2: A. crust
Why? The crust is the outer most layer which is the layer we walk on so to speak. The Earth can be broken up into four layers and as said before the crust is the outer part of it. It is actually amounts to less than 1% of Earth's volume.
Question 3: B. basalt
Why? If we were to average the oceanic crust we would get something around six kilometers and this is the thickness. This is mostly made up of basalt.
Question 4: B. outer core
Why? Due to difference in pressure and temperature the outer core tends to release dense matter which sinks while warm (less dense rises). This causes the Coriolis force, resulting from the Earth's rotations.
Cuando se queman combustibles que tienen algún compuesto de azufre se produce dióxido de azufre (SO2), un gas irritante que puede provocar lluvia ácida. En el análisis del aire de una ciudad se ha encontrado una concentración de SO2 de 14 mg/m^3 ¿Qué cantidad de SO2 habrá en 1 L de aire?
Answer:
See answer below
Explanation:
I have to answer this question in english because is the rule here. I hope you can understand this.
Now, in order to answer this, is really easy. We already have the quantity of SO₂ in the air of a city. This concentration is 14 mg/m³, so we want to know the quantity in 1 L. This quantity can be expressed in mass.
If concentration according to the units is: mg/m³ This means that we have units of mass and volume. So, in order to know the quantity of SO₂ in mass, we need to convert the units of volume m³ to liter.
1 m³ is covered in 1000 L, therefore:
14 mg/m³ * 1 m³/1000 L = 0.014 mg/L
Then, the mass will be:
m = 0.014 mg/L * 1 L
m = 0.014 mg of SO₂
This is the quantity of SO₂ in 1 L.
When humans plant more trees, carbon can begin entering the ____
a- hydrosphere
b- geosphere
c- biosphere
Answer:
biosphere
Explanation:
The carbon cycle is the biogeochemical cycle by which carbon is exchanged between the biosphere, geosphere, hydrosphere and atmosphere of the Earth.
The biosphere refers to the regions of the surface and atmosphere of the earth or another planet occupied by living organisms.
Plants are responsible for taking in carbon in nature. When more trees are planted, carbon is absorbed by plants which is a component of the biosphere. Hence planting more trees means increasing the intake of carbon into the biosphere.
Leon made a study chart about human-induced changes to
the environment.
Which headings best complete the chart?
Environmental Changes Caused by Humans
X: Habitat Destruction
Y: Pollution
Y
Results from
introducing harmful
substances into the
Results from natural areas
being cleared and replaced
by human development
© X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
0 X: Pollution
Y: Habitat Destruction
environment
Example: deforestation
Example: oil spill
The question was not well arranged above. It has been arranged in the answer below.
Question:
Leon made a study chart about human-induced changes to the environment.
Environmental Changes Caused by Humans
X Y
Results from introducing harmful substances into the environment
Example: oil spill
Results from natural areas being cleared and replaced by human development
Example: deforestation
Which headings best complete the chart?
X: Habitat Destruction
Y: Pollution
X: Long-Term Changes
Y: Short-Term Changes
X: Short-Term Changes
Y: Long-Term Changes
X: Pollution
Y: Habitat Destruction
Answer:
X: Pollution
Y: Habitat Destruction
Explanation:
From the above question, Leon gave us two variables, X and Y.
The human induced changes were divided into two.
1. Results from introducing harmful substances into the environment
Introducing harmful substances into the environment is also called pollution. And we can represent this as X which is the first variable.
2. Results from natural areas being cleared and replaced by human development.
This description given in number two above whereby land areas are been cleared and replaced by human development has a negative effects on the environment because the vegetation which includes the trees are been cut down and living organisms(animals) will go extinct gradually. This act affect the balance of the ecosystem and it can be referred to as the destruction of the habitat of living organisms
Therefore, the correct headings best complete the chart is :
X: Pollution
Y: Habitat Destruction
Answer:
what the top person said
Explanation:
☺
HELP ME PLEASE 40 POINTS You may select a topic from the list below, or choose your own.
black hole
oort cloud
star types (supergiant, red dwarf, white dwarf)
supernovae
planetary nebulae
Andromeda galaxy
quasar
Use the library and other resource materials to research and understand your topic. Remember that nasa.gov is a web site that has reliable information as well that you may use for your research. Now write a 300-word report on what you have learned in the essay box below.
Answer:
Do black hole
Explanation:
How many moles of gold are Cleveland to 1.204×1024 atoms
Answer:
10
Explanation:
ye
Answer:
2
Explanation:
A child has a balloon in his house in the air conditioning. He goes outside with the balloon on a hot day. What happens to the temperature of the gas and volume of the balloon?
Answer:
There would be an increase in temperature and corresponding increase in the volume of the balloon
Explanation:
Charles law is been here
Charles law states that the volume of a given mass of gas is directly proportional to the temperature in Kelvin, provided that the pressure on the gas is kept constant. Mathematically Charles law can be represented thus;
V∝ T
Where V is the volume of the gas and;
T is the temperature.
Relating Charles Law to the question
The child moved outside from the room, constant atmospheric pressure is maintained.The temperature of the room is lower than the temperature outside.From Charles law postulation, there would be an increase in volume because of the increased temperature, since our pressure is same.
Propane, the gas used in barbeque grills, is made of
carbon and hydrogen. Will the atoms that make up
propane form covalent bonds? Why or why not?
Answer:
The atoms of propane will form covalent bonds because carbon and hydrogen are both nonmetals.
Explanation:
sample response
Which 1.0 M solution has the lowest pH?
A.
HCN
B.
H3PO4
C.
H2C2O4
D.
HCl
The conditions of 1 atm pressure and 0°C are known as
Explain on any two materials that you would expect to use for the wheelchair (both back support and
arm support) with less generation of heat during the hot summers.
Answer:
In the backrest use materials where it is easy to clean and where they do not absorb fluids, in this way it would be cooler, such as an ecological leather simulator.
And in the armrest as well, but in both areas we must not rule out that if or if it should have even a minimum of padded surface so that the patient or the person who spends most of the day in the wheelchair does not suffer from joint pain.
Explanation:
Some wheelchair factories also implement modern chairs where they are made of stainless steel structures lined with padded material with perforated fabrics that allow breathing and aeration of body areas that have contact with the fabric.
In photosynthesis, what are the two major reactions that take place?
Answer:
The two stages of photosynthesis: Photosynthesis takes place in two stages: light-dependent reactions and the Calvin cycle (light-independent reactions). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.
Explanation:
Hope you get it right!
The two major reactions that takes place in photosynthesis are light dependent and light independent reactions.
PHOTOSYNTHESIS:
Photosynthesis is the process by which green plants and other autotrophic organisms obtain their own food using energy from sunlight. The process of photosynthesis takes place in the chloroplast organelle of the cell where a pigment called CHLOROPHYLL, absorbs photons of light. Photosynthesis, however, consists of two stages namely: light dependent and light independent reactions. Light dependent reaction takes place strictly in the presence of sunlight and involves the production of ATP and NADPH molecules, which are used in light independent reaction. Light independent reaction, also called Calvin cycle, can occur with or without sunlight, hence, it is called dark reaction. Calvin cycle uses the product of the light stage to synthesize glucose molecule. Therefore, the two major reactions that takes place in photosynthesis are light dependent and light independent reactions.Learn more: https://brainly.com/question/15289200?referrer=searchResults
Calculate the pressure using the formula P=1.03+ mass on syringe/area of top of syringe
Answer:1.08
Explanation:
Answer:
1.08kg/cm^2
Explanation:
Edge2021
