Answer:
A.
Explanation:
give brainlist
Find the average atomic mass for Cl if 75.78% of Cl atoms are Cl-35 with a mass of 34.96885271 u and 24.22% are Cl-37 with a mass of 36.96590260 u.
Answer:
35.45253819
Explanation:
(0.7578*34.96....)+(0.2422*36.96...)
Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass of Chlorine is 35.45g.
What is mass?Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)
Substituting the given values
Average atomic mass=(0.7578×34.96....)+(0.2422×36.96...)
Average atomic mass=35.45g
Therefore, the average atomic mass is 35.45g.
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.
The skydiver will soon open her parachute. How will her velocity change when
the parachute first opens?
Answer:
How will her velocity change when does parachute first open?
The skydiver's weight is balanced by the air resistance. There is no resultant force and the skydiver reaches terminal velocity. When the parachute opens, the air resistance increases. The skydiver slows down until a new, lower terminal velocity is reached.
When a skydiver opens their parachute, they accelerate upwards. This is not the same as saying the move upwards. Acceleration is a change in velocity. They keep feeling an upward force (while moving downward) that slows them until they get to a new terminal velocity.
What force changes when a parachute opens?
An open parachute increases the cross-sectional area of the falling skydiver and thus increases the amount of air resistance which he encounters (as observed in the animation below). Once the parachute is opened, the air resistance overwhelms the downward force of gravity.
What happens if you open the parachute too early?
You are likely to drift off the drop zone. The winds can be pretty heavy at high altitudes, and unless you steer continuously they may blow you off-course. Needless to say, the refrigeration effect of the wind and slipstream will make you feel even colder than the mere altitude. Your landing is likely to be rough.
what are the representative elements usually called
Answer:
There are two sets of groups in the periodic table. The first set are Group A elements and are also known as representative elements. The second set are Group B elements and are also known as transition metals. Representative elements are the most abundant elements on earth.
to what direction does the rope move?
Answer:
This question appears incomplete
Explanation:
However, the direction in which the tension acting on the rope is directed is the direction the rope will move. Hence, when a rope is attached to an object, the rope will only "realistically" move in the opposite direction because the rope cannot push an object but can only pull an object, hence can only move in the direction away from the object.
NOTE: Tension can be defined as the pulling force of an object through the use of a string, chain or anything with a potential to stretch fully.
Which ion is found in all acids
An acid is a chemical that, when added to water, releases hydrogen (H+) ions. The ion is found in all acids is H⁺ ion. Therefore, option B is correct.
What is an acid ?A Brnsted-Lowry acid or Lewis acid is a molecule or ion that has the ability to donate a proton or establish a covalent bond with an electron pair.
An acid is a chemical that, when added to water, releases hydrogen (H+) ions. A hydrogen ion is made up solely of a proton. The formulations for many acids may all be found to contain at least one H, such as hydrochloric acid.
The word "acid," which refers to the sour flavor and pungent odor of numerous acids, derives from the Latin word acidus, which meaning "sour." Examples: Because acetic acid and water are diluted, vinegar has a sour flavor.
Thus, option B is correct.
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What phase of matter would the above substance be at 500⁰C?
Answer:
Is 4 an answer? If so, that is correct
Explanation:
when a sample of CO2(s) becomes CO2(g), there is a change is
Explanation:
hope it helps you please make me brainlest (it's a photo)
Which six elements are generally considered metalloids
Answer:
boron, silicon, germanium, arsenic, antimony, and tellurium
Explain how metallic bonding supports the properties of metals
Answer:
Explanation: Because electrons are delocalized around positively charged nuclei, metallic bonding explains many properties of metals. ... Further, because the electrons are free to move away from each other, working a metal doesn't force together like-charged ions, which could fracture a crystal through the strong repulsion.
what is the systematic or IUPAC name for SO2
Answer:
Sulfur trioxide
Sulfur trioxide | SO3 - PubChem.
Explanation:
which characteristic that a scientific measuring tool should have?
Answer:
metric system
Explanation:
Scientists use the metric system, which uses the following base units: 1. Meter for length 2. Gram for mass 3. Liter for volume 4. Second for time Different prefixes
The mass of an oxygen–18 atom is 18.0042 amu. Compute the calculated mass.
Answer:
The calculated mass of one atom of oxygen-18 is approximately 2.99×10⁻²³ grams
Explanation:
The given mass of an oxygen-18 atom = 18.0042 amu
The definition of the atomic mass unit is the mass equivalent to the mass of one twelfth the atomic mass of one atom of carbon-12. The atomic mass unit is used to express the mass of an isotope of an element
1 amu = 1.66 × 10⁻²⁴ grams
Therefore;
18.0042 amu = 18.0042 × 1.66 × 10⁻²⁴ grams ≈ 2.99×10⁻²³ grams
The calculated mass of one atom of oxygen-18 ≈ 2.99×10⁻²³ grams
The atomic mass unit can be taken as the mass in grams of one mole of the substance
Therefore, the mass of one mole of the oxygen 18 atom = 18.0042 g
what is one way that the thermal energy of a system may be changed?
Answer:
In a open system, the thermal energy of a system may be changed by adding or removing matter with a different temperature.
Explanation:
The thermal energy of a system can be changed when a new substance of different temperature is introduced into the system
The thermal energy of a system is the amount of heat energy contained in that system.
The quantity of heat in a system is given as;
[tex]Q = mc \Delta \theta[/tex]
where;
[tex]\Delta \theta[/tex] is the change in the temperature of the system
When a new substance is introduced into the system, the temperature of the resulting system changes.
For example;
a hot iron introduced into a cold water, will increase the temperature of the water thereby increasing the thermal energy of the water.Thus, the thermal energy of a system can be changed when a new substance of different temperature is introduced into the system.
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The group that has a single factor changed in an experiment is called:
Answer:
the experimental variable
Explanation:
What effect is used to determine the speed of distant stars?
the Einstein effect
the Doppler effect
the Hubble effect
the Galaxy effect
Answer:
doppler effect
Explanation:
''The Doppler effect occurs for light as well as sound. For instance, astronomers routinely determine how fast stars and galaxies are moving away from us by measuring the extent to which their light is “stretched” into the lower frequency, red part of the spectrum''
Write the orbital notation for element 53.
Answer:
Its complete electron configuration is 1s22s22p63s23p64s23d104p65s24d105p5.
Explanation:
Put the following in order of decreasing electronegativity:
Oxygen-
Fluorine-
Carbon-
Lithium-
Beryllium-
Answer:
Carbon < Lithium < Beryllium < Oxygen < Fluorine
Explanation:
what happens when you microwave a chip bag....
(asking for a friend)
Answer:
i have done this before
Explanation:
the bag just starts shrinking after sparkling a little bit
what is generally true about the compressibility of solids?
Answer:
That it is hard to compress
Explanation:
Which is an example of how water is used inside and around the home?
fishing in a lake
washing clothes at the laundromat
brushing teeth before bed
washing a car in an automatic carwash
An example of how water is used inside and around the home is brushing teeth before bed. Details about water management can be found below.
How is water utilized?Water is a inexhaustible or renewable resource that can be used for domestic and personal purposes.
Water can be used around the home in the following ways:
Brushing of teethTaking one's bathDoing dishesTherefore, an example of how water is used inside and around the home is brushing teeth before bed.
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One of the main goals of environmental science is to help humans use the environment in a way that is economically profitable.
true or false
Answer:
true this is correct its your econimically
Which Respiratory organ is responsible for giving oxygen to the bloodstream?
-Bronchi
-Trachea
-Alveoli
-or Larynx?
Answer:
I think that it is Trachea
Can someone help me answer this ASAP!! thank you!
The molecular geometry of molecules is given serially as, tetrahedral,trigonal,tetrahedral,tetrahedral,linear,linear.
What is molecular geometry?Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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2Mg(PO4)2
Mg =
-
P =
O =
Answer:
262.8577 g/mol
Explanation:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Answer:
The molar mass and molecular weight of Mg3O8P2 is 262.858.
Explanation:
Brainleist if correct
___________is part of the Milky Way Galaxy.
Answer:
Our Sun (a star) and all the planets around it are part of a galaxy known as the Milky Way Galaxy.
A mixture is what you get when you combine two substances in such a way that no chemical reaction occurs between the components. A solution is a mixture that looks exactly the same everywhere. Which of these mixtures is a solution
A) a fruit salad
B) a chocolate chip cookie
C) a mixture of sugar and salt
D) a mixture of sugar and water
how should you draw the field lines for the earths magnetic fields
Answer: look up field lines for the earths magnetic fields and then go to images
Explanation:
50 Points!! 25 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
1:f 2:a 3:c 4:e 5:c 6:d 7:b 8:f 9:a 10:d 11:c 12:c 13:b
Explanation:
4. Which of the following
is an example of a
heterogeneous mixture?
a, tea
b. oxygen
c. pizza
d. water
Answer:
water
Explanation:
Answer:
c. pizza
Explanation:
Pizza is a heterogeneous mixture because it components are not uniform.
Can an organism be made of only one cell?