Answer:
Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.
How many energy levels does the element helium have?
I appreciate the help!
Please try your best to answer this!
Answer:
Element Helium have 2 energy levels.
Explanation:
HELIUM - With the symbol He and the atomic number 2, helium is a chemical element. It is a colorless , odorless, tasteless, non-toxic, inert, monatomic gas that is the first in the periodic table in the noble gas group. Of all the elements, its boiling point is the lowest.
At about 24 % of the total elemental mass, which is more than 12 times the mass of all the heavier elements combined, it is present. In both the Sun and Jupiter, its abundance is identical to this. This is due to helium-4's very high nuclear binding energy (per nucleon) with respect to the next three elements following helium.
Hence , the answer is 2 energy levels in Helium atom.
what is the factor that changes the reaction rate in the following example and why:
More concentrated detergents wash better.
Answer:
Concentration of the detergents
Explanation:
The factor that changes the reaction is the concentration of the reacting detergent.
Here are some factors that influences the rate of reaction;
Nature of reactantsConcentration of the reactants or pressure Temperature Presence of a catalystSunlightThe reaction rate is directly proportional to the concentration of the reactants.
Here since we have a more concentrated detergent, its reaction rate will be higher than normal and it will wash better.
An atom has a mass number of 43 and an
atomic number of 23. How many protons
does it have?
Answer:
23
Explanation:
In 1973, the insecticide called DDT wasbanned in the United States due to concerns that itwas toxic to fish and that it may have affected birds.There is little scientific evidence that DDT is directlyharmful to humans. How could banning DDT be beneficial to human health
Answer:
See explanation
Explanation:
DDT is dichlorodipphenylrtrichloroethane. It is was a popular insecticide used for agricultural purposes. Racheal Carson's book, silent springs drew attention to the use of insecticides such as DDT in agriculture.
DDT is a non-biodegradable, fat-soluble compound. It enters into the food chain and has the ability to bioaccumulate in the human body where it becomes deposited in the adipose tissue.
There is no direct harmful effect of DDT to humans, however, when oxidation of DDT takes place in body many harmful metabolites are released into the body causing harmful effects to human health such as; breast cancer, male infertility, miscarriages and low birth weight, developmental delay and liver damage.
There is convincing empirical evidence supporting the carcinogenicity of DDT its main metabolites DDE and DDD, however, many studies on the harm caused by DDT and its main metabolites in the body have so far led to inconclusive, and sometimes negative, results
PLZ HELPPPPP ASAPPPPP
Answer: all of the above
Explanation: All the choices listed above can be used to describe liquid
In which ocean zone would photosynthetic organisms be found?
Answer:
Photic Zone
Explanation:
The photic zone is the uppermost layer of the sea that recieves sunlight allowing phytoplankton to perform photosynthesis.
answer question in picture please.
Answer:
b
Explanation:
kkkk(kkkkkkkkkkkkwritten am an ah roo ero di si di dh dh ah ah eh si eri di do
Answer: the answer is B. C
Explanation:
Which experimental setup would let a student investigate the connection between kinetic energy and temperature? (1 point) placing one drop of food coloring in a cup with 60 ml of water at 10",placing one drop of od coloring in a second oup with 60 mL of water at 40°C placing one drop of food coloring in a cup with 50 ml of water at 10" placing one drop of food coloring in a second cup with 100 ml of water al 10" placing one drop of food coloring in a cup with some of water al 10 placing two drops of food coloring in a second cup with 100 ml of water an 100 placing one drop of food coloring in a cup with some of water at 100 placing two drops of food coloring in a second cup with 50 ml of water at To ONO type here to search
Answer:
The correct option is;
Placing one drop of food coloring in a cup with 60 ml of water at 10°, placing one drop of food coloring in a second cup with 60 ml of water at 40°C
Explanation:
The experimental setup that would allow the student investigate the connection between kinetic energy and temperature should be made up of the following characteristics
1) The constant terms for the experiment should be defined, which in this case are
a) The volume of the water which is 60 ml in both subjects of the experiment
2) The definition of the variable that produces the effect that is being monitored, which is the use of the different temperatures in the two experimental subjects
3)The environmental limits of the experiment, which is the water and the food coloring used
Answer:
b/2
Explanation:
Does changing the number of protons change the identity of the element you have built ?
Answer: Yes.
Explanation:
the number of protons in the nucleus determines an element's identity. Chemical changes do not affect the nucleus, so chemical changes cannot change one type of atom into another. The number of protons in a nucleus does change sometimes, however. The identity of the atom, therefore, changes.
5. What causes a moving object to change direction?
A. Acceleration
B. Velocity
C. Inertia
D. Force
Answer:
D. Force
Explanation:
Applied force can cause change in direction
A force applied at an angle to the direction of motion of an object can cause it to change direction. It is possible that the object keeps going at the same speed, if the force is applied perpendicular to the direction of motion. But the velocity of the the object changes.
Plz help! The best answer will be marked as brainliest!
Make a funny sentence for the beneficial or great uses of magnesium
I DON¨T WANT A MEME!
Here is an example for Mercury, it HAS to for Magnesium
¨I have a long history of use in fluorescent lighting so I can light up any room ¨
Answer:
"Like when people say like im a party fowl but I'm like OMg, I'm like the reason everyone loves the 4th of July like I am 4th of July.
Explanation:
As magnesium ignites easily in air and burns with a bright light, it's used in flares, fireworks and sparklers. I imagine Magnesium talks like a valley girl lol.
3. Two boxes need to be moved. Box A is 10 kg. Box B is 3 kg. Which box will 1 point
require more force to move?
BOXA
BOX
Answer:
box A
Explanation:
10 is bigger than 3 since 10 is bigger it has more force in it
11) Look at the phenotypes of Beyonce and
Jay Z. If these two had children, could they have
children with a widow's peak? Why or why not? Use
a Punnett Square to explain your answer.
Help me please
Answer:
No
Explanation: Neither has the dominant trait for Widow's peak, so they're both aa
Which of the following is considered a sign of a chemical change?
How to use system and habitable in a sentence
Answer:
The farthest habitable spot to the south The whole distribution system broke down.
Explanation:
Iron, a metal, has which of the following features?
electrons that transfer between atoms to make cations and anions
a sea of electrons
firmly bonded electrons
electrons shared between single pairs of atoms
Answer: A sea of electrons
Explanation:
PLEASE HELP!!
A model stands on a scale and finds her weight to be 105 pounds. If
the pressure exerted by her feet on the scale is 2.16 pounds per
square inch, what is the area of her feet in cubic centimeters?
__cm2
Answer:
313.5cm²
Explanation:
Given parameters:
Weight of model = 105pounds
Pressure applied on the scale by model = 2.16pounds per square inch
Unknown:
Area of her feet in cm² = ?
Solution:
Pressure is the force per unit area;
Pressure = [tex]\frac{Force}{Area}[/tex]
Input the parameters and solve;
2.16 = [tex]\frac{105}{Area}[/tex]
105 = 2.16 x Area
Area = [tex]\frac{105}{2.16}[/tex] = 48.6in²
We need now to convert the in² to cm²
1in² = 6.45cm²
48.6in² = 48.6 x 6.45 = 313.5cm²
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Will cardboard sink in cold or hot water faster
Which of the following has the smallest atomic radius?
A. Astatine
B. Bromine
C. Fluorine
D. Iodine
Answer:fluorine
Explanation:
can someone help me please
Answer:
Particle energy
Explanation:
This part of the plant cell turns sunlight into food. It is called a
cell wall
chloroplast cell membrane
cytoplasm
Answer:
Chloroplast
GOOD LUCK!!!
Answer:
b
Explanation:
Calculating Density Warm Up
What is the density (g/cm3) of 48.0 g of a metal if the
level of water in a graduated cylinder rises from 25.0
mL to 33.0 mL after the metal is added?
1) 0.17 g/cm3
2) 6.0 g/cm3
3) 380 g/cm3
33.0 mL
25.0 mL
object
Calculating Density Warm Up
Answer:
2
Explanation:
33-25=8
48/8=6
The density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.
What is density?
The density of any substance is the division of the mass of the given substance to the volume of the given substance and its unit is centimeter cube.
where,
density = mass of substance / volume of the substance
mass of substance = 48.0 g
volume of substance = 33.0 - 25.0 = 8 ml
substituting the value in the formula,
density = 48.0 / 8 = 6 cm³
Therefore, density (g/cm3) of 48.0 g of a metal if the level of water in a graduated cylinder rises from 25.0 mL to 33.0 mL after the metal is added density will be 6.0 g/cm3. option B is correct.
Learn more about density, here:
https://brainly.com/question/13799762
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In fermentation, what do cells use instead of oxygen to break down glucose?
Answer:
sugar
Explanation:
In the absence of oxygen, the cell uses a process called anaerobic fermentation. or simply fermentation. Fermentation doesn't break the sugar down any further, it simply helps reset the system so that more sugar can be broken down.
Thus the above response is right.
Learn more about fermentation here:
https://brainly.com/question/16516092
Name a substance that is made of individual atoms instead of moleules and explain why
Neodymium battery + sulfuric acid ——> neodymium sulfate + iron sulfate + boron + hydrogen. I have 5g of Nd2Fe14B and enough H2SO4, how much NdSO4 will I get?
Mass of Nd₂(SO₄)₃ : 2.653 g
Further explanationReaction
Nd₂Fe₁₄B + 17H₂SO₄ → Nd₂(SO₄)₃ + 14FeSO₄ + B + 17H₂
5 g Nd₂Fe₁₄B
MW = 2. 144,242 + 14. 55.845 + 10.811
MW = 288.484 + 781.83+10.811=1081.125 g/mol
mol :
[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{5}{1081.125}=0.0046[/tex]
mol Nd₂Fe₁₄B = mol Nd₂(SO₄)₃=0.0046
so mass of Nd₂(SO₄)₃ :
MW Nd₂(SO₄)₃ = 2.144.242+3.32,065+12.15,999
MW = 288.484+96.195+191.988=576.667 g/mol
[tex]\tt mass=mol\times MW\\\\mass=0.0046\times 576.667\\\\mass=2.653~g[/tex]
1) the average rate of reaction in the first minute
2)the average rate of reaction in the second minute
3)the time when the reaction has completed
4)the average rate of reaction for overall reaction
5)the rate of reaction at 30 seconds
6)the rate of reaction at 105 seconds
1. 0+15+30+45+60=150/5=30 s
0+10+16+22+27=75/5=15 cm^3
then, 15/30= 0.5 cm^3/s(average rate of rxn)
2. 0+15+30+45+60+75+90+105+120=540/9=60 s
0+10+16+22+27+31.50+36+39.5+42=224/9=24.89cm^3
then, 24.89/60=0.414cm^3/s (avrg rate of rxn)
3. overall rxn add all the time divide by 12 and the volume add them too and divide by 12. after take average volume divide by the average time to get the average rate of overall rxn
4. 16/30= 0.533cm^3/s
5. 39.5/105= 0.37cm^3/s
A 0.2027 gram sample of finely powdered limestone (mainly CaCO₃) was dissolved in 50 mL of 0.1035 M HCl. The solution was heated to expel CO₂ produced by the reaction. The remaining HCl was then titrated with 0.1018M of NaOH and it required 16.62 mL. Calculate the percentage of CaCO₃ in the limestone sample? CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
Answer:
Explanation:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O
100 gm + 2000 mL of M HCl
Amount of HCl remaining = .1018 M of 16.62 mL
= .1018 x 16.62 mL of M HCl
= 1.69 mL of M HCl
Initial HCl taken = 50 mL of .1035 M HCl
= 5.175 mL of M HCl
HCl reacted = 5.175 - 1.69 mL of M HCl
= 3.485 mL of M HCl
2000 mL of M HCl reacts with 100 gm of CaCO₃
3.485 mL of M HCl will react with .174 grams of CaCO₃
percentage of calcium carbonate = .174 x 100 / .2027
= 85.84 %
when two or more atoms are combined it is called a ?
Answer:
Elements can be chemically combined into compounds, therefore, a compound consists of two or more elements combined, in definite proportions, by chemical means. Compounds may be formed by combining atoms of their constituent elements by ionic bonds or by covalent bonds.
What is the mass of 5 mL. of a solution if the density of the solution is 1.5 g/mL.? Show work.
Answer:
The answer is 7.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 5 mL
density = 1.5 g/mL
We have
mass = 1.5 × 5
We have the final answer as
7.5 gHope this helps you
