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.
4
The element bromine at room temperature is a liquid with a density of 3.12 g/nl.
Calculate the mass (wanted measurement) of 125 mL (given measurement) of bromine.
(use the given density as the conversion factor to calculate the wanted measurement).
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Please help!!
What colors do acids and bases turn litmus paper?
Answer:
acid turns blue litmus red and base turns red litmus blue
Answer:
turns red or pink if it is acid and turns green if it is a base
Explanation:
litmus paper is blue
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
The electron configuration of an element is 1s^ 2 2s^ 2 2p^ 2 How many valence electrons does the clement have? (1 point )
Answer:
:)
Explanation:
an object sitting on the floor can have potential energy true or false
Answer:
True
Explanation
Any object that's still, has potential energy
Answer:
True
Explanation:
it just depends on an object's weight and its height above the ground
Write down the answer. Make sure to use the correct number of sig figs or
spots after the decimal. 987.22 - 377.1*
Answer:
610.1
Explanation:
When we add or subtract the values, the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.
In given values 377.1 has only decimal place thus in result after decimal there should be one digit only.
987.22 - 377.1 = 610.1
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
Now we will calculate the difference between 7.69 and 4.0.
7.69 - 4.0 = 3.69
In given values 4.0 have less number of significant figures thus result must have only two significant figures . So we would round the result.
3.7
Calculate the average atomic mass of unknown element X. You determine that isotope 127X makes up 80%, isotope 126X makes up 17%, and isotope 128X makes up 3%.
A. 127.10 amu
B. 126.86 amu
C. 127.54 amu
D. 126.20 amu
Answer:
Option B. 126.68 amu
Explanation:
The following data were obtained from the question:
Isotope A (¹²⁷X):
Mass of A = 127
Abundance (A%) = 80%
Isotope B (¹²⁶X):
Mass of B = 126
Abundance (B%) = 17%
Isotope C (¹²⁸X):
Mass of C = 128
Abundance (C%) = 3%
Average atomic mass of element X =.?
Th4 average atomic mass of X can be obtained as follow:
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(127 × 80)/100] + [(126 × 17)/100] + [(128 × 3)/100]
= 101.6 + 21.42 + 3.84
= 126.68 amu
Therefore, the average atomic mass of X is 126.68 amu
Is uranium a mixture or pure substance
Answer: is a pure substance
Explanation:
Two reasons photosynthesis is important
Answer:
Gives us oxygen to live, and if produces products such as, rubber, timber, herbs, and medicines.
Question 5
1 pts
Chloroethene,C2H3C1, reacts with oxygen according to the equation below.
2 C2H2Cl (9) + 5O2(g) + 4CO2 (g) + 2 H20 g) + 2 HCl (9)
What is the amount, in mol, of H2O produced when 10.0 mol of C2H3Cl and 10.0 mol of
O2 are mixed together, and the above reaction goes to completion?
08.00
10.0
04.00
20.0
Lo
Answer:
4.00 moles of water
Explanation:
The equation of the reaction is:
2 C2H2Cl (9) + 5O2(g) -------> 4CO2 (g) + 2 H20( g) + 2 HCl(g)
To find the limiting reactant, we find the species that yields the lowest number of moles of water.
From the reaction equation;
2 moles of C2H2Cl yields 2 moles of water
10 moles of C2H2Cl yields 10 * 2/2 = 10 moles of water
Similarly;
5 moles of oxygen yields 2 moles of water
10 moles of oxygen will yield 10 *2/5 =4 moles of water
Hence oxygen is the limiting reactant.
10 moles of oxygen yields 4 moles of water.
Plz help! :) :D I will mark you as BRAINLIEST for the best answer!!! ( I actually mean it)
Physical and Chemical Properties of Magnesium
Here is an EXAMPLE of how it has to be like. Instead of Mercury, you HAVE to do Magnesium
Physical Properties of Mercury: ”I’m a highly stable element, so you can count on me”
Chemical Properties of Mercury: ”I love to travel but I do corrode aluminum so we won’t be flying off on adventures in airplanes planes anytime soon”
Why are atoms neutral?
A They have neutrons in the nucleus
B. They have the same number of protons and electrons
They tend to have 8 valence electrons
D
None of the above
Answer:
B. They have the same number of protons and electrons
Explanation:
Protons have a charge of +1, electrons have a charge of -1, and neutrons have no charge, making them neutral. When there are the same number of protons as there are electrons, the charges balance out, leaving you with a neutral atom.
What do you look for when trying to identify a formula and/or compound name as ionic?
Answer:
Ionic compounds are named with the cation first and the anion last. The same convention is used when writing their chemical formulas.
Explanation:
Pls help me here, thanks in advance
Answer:
What's the problem???
name one state of matter
Answer:
solid
Explanation:
Answer:
Gas
Explanation:
ALL OF THESE ARE FORMS OF MIXTURES EXECPT...
A. ALLOYS
B. NEON
C. COLLOIDS
D. SOLUTIONS
Answer:
B. NEON.
HOPE IT HELPED
An increase in which of the following would increase the boiling point of a
liquid?
Answer:
The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.
what is potiential and kinetic engergy? pls someone answer my question
Answer:
Potential Energy is stored energy or energy of position (gravitational). The object isn't moving. For example, a ball being held is potential energy because the object isn't moving but it has the potential of turning into kinetic energy.
Kinetic Energy is the energy of motion. For example, running. You are moving, and there is clear action and activity
Energy stored in an object due to its position is Potiential energy . Energy that is moving object has due to its motion is Kinetic energy .
In Ionic compounds the charges of the cation and anion should cancel out.
True
False
Which of the following is measured in Newtons?
Mass
Acceleration
Weight
Momentum
Answer:
Mass is measured in kg
Acceleration is measured in m/s^2
Weight is measured in Newtons
Momentum is measured in kg/m^2
How long will it take for 500.0g of radium decay to 2.0g
On July 4, 2020, America turned 7.69 x 10^9
seconds old. On that day, how old was America
in years? (Assume 365 days in a year)
America's age = 243.85 years
Further explanationWhen converting units, list and multiply all the units until you find the unit you want
Time unit conversion
1 year = 365 days
1 day = 24 hours
1 hour = 3600 s
7.69 x 10⁹ seconds to years :
[tex]\tt =7.69\times 10^9~s\times \dfrac{1`hour}{3600~s}\times \dfrac{1~day}{24~hours}\times \dfrac{1~years}{365~days}\\\\=\dfrac{7.69\times 10^9}{3600\times 24\times 365}\\\\=\boxed{\bold{243.85~years}}[/tex]
If you weighed 25 grams of NaOH in this lab, how many moles of NaOH
would you have?
Please choose the best description, or definition of Faunal Succession.
principle stating that specific groups of organisms lived and died within a specific
time frame due to the ice age
principle stating that specific groups of fawns lived in a specific region and are
found in the rocks shoing fawns onl live in specific areas.
principle stating that specific layers of the earth have contain fauna of different
types showing biodiversity.
rinciple stating that specific groups of organisms have followed, or succeeded.
one another in a definite sequence through Earth history
Answer:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history
Explanation:
Principle stating that specific groups of organisms have followed, or succeeded one another in a definite sequence through Earth history describe Faunal succession because it is a principle that indicate that fossil plants and animals succeed each other in a sequential manner even if they occur in different places. Successive strata and faunas are linked together to form composite section in the Earth's history.
Answer:
the last one
Explanation:
What happens when you touch two hot bowls made of different materials? The wooden and metal bowl are both at the same temperature and HOTTER than your finger. Compare the direction and speed of the heat arrows for the wooden and metal bowl. Explain WHY and what affects HOW the arrows move from the wooden and metal bowl to the finger.
Answer:
Explanation:
Both metal and wooden bowls are at the same temperature . But wood is non-conductor of heat whereas metal is conductor of heat .
If we touch the wooden bowl , heat flows from hot to cold object . Since the finger is at higher temperature , heat flows from finger to wooden bowl . But , since wood is non conducting , it does not allow heat to be conducted through it . Hence very less heat will be conducted from our finger .
On the other hand , if we touch a metal bowl , heat flows from finger to the metal bowl , without any hinderance . Hence rate of heat flow will be fast in case of metal bowl . As a result of it , we feel cool in touching metal bowl . This feeling will be absent in case of wooden bowl.
Which element is an inner transition metal?
uranium (U)
osmium (Os)
radium (Ra)
hafnium (Hf)
Answer:
Os
Explanation:
Atoms of different element can not have same atomic number because only same type of atoms combine to form element. Atoms belonging to different element can have different atomic number. Therefore, the correct option is option A.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same. Two or more than two atoms with different physical or chemical properties can not combine together to form an element.
Among all the given options, uranium (U) is an inner transition metal. Inner transition metal are the metals that belongs to f block of periodic table as their last electron goes into f subshell.
Therefore, the correct option is option A.
To know more about element, here:
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What tectonic plate boundary caused the formation of Mount Fuji?
Answer:
the Amurian plate, the the Okhotsk plate, and the Filipino plate all converge in the region beneath Mount Fuji.
Explanation:
which order system shows the levels of organization from largest to smallest
organism, organ system cell organ tissue
organism tissue organ system organ cell
organism organ organ system cell tissue
organism organ system organ tissue cell
Answer:
cell → tissue → organ → organ system → organism
Explanation:
Answer:
The correct answer is cell → tissue → organ → organ system → organism.
Explanation:
I know this because I am smart
What’s science in science
Answer:
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence. Scientific methodology includes the following: Objective observation: Measurement and data (possibly although not necessarily using mathematics as a tool)
Explanation:
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (e.g., biology, chemistry, and physics), which study nature in the broadest sense; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences
A hypothetical element has two main isotopes with mass numbers of 59 and 62. If 73.00% of the isotopes have a mass number of 59 amu, what atomic weight should be listed on the periodic table for this element? Answer in units of amu.
since 73% of the isotope is given, take 100%-73% to get the remaining % of the isotopes which is going to be 27%.
hence,
atomic weight= (73×59) + (27×62)
=4307+1302
=5609 amu