Answer:
Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.
Explanation:
The molecular mass gives the mass of a molecule relative to that of the 12 C atom, which is taken to have a mass of 12. Hence why Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.
List and describe the 2 main causes of species extinction happening today.
Answer:
habitat destruction, overexploitation, climate change, nitrogen pollution, and invasive species.
Explanation:
Main Modern Causes of Extinction:
habitat destruction - the process by which a natural habitat becomes incapable of supporting its native species.
overexploitation - harvesting a renewable resource to the point of diminishing returns.
climate change - includes both global warmings driven by human emissions of greenhouse gases and the resulting large-scale shifts in weather patterns.
nitrogen pollution - a form of water pollution, refers to contamination by excessive inputs of nutrients.
invasive species - an introduced organism that negatively alters its new environment.
The conjugate pair for a strong base is -
O a strong base
O a weak acid
a strong acid
O a weak base
If five gases in a cylinder EACH exert a partial pressure of 2.5 atm, what is the total pressure in the cylinder? Be sure to bubble your answer on the answer sheet.
Answer:
16 atm
Explanation:
What does thermal energy refer to?
A. The chemical energy in reactions
B. The heat transferred between objects
C. The kinetic energy of particles within a system
D. The energy obtained from the sun
SUBMIT
Answer:
c
Explanation:
Thermal Energy has been the type of energy that refers to the kinetic energy of particles contained in a system. Hence, the correct option is (C).
What is thermal energy?
Thermal energy is the energy contained within a system as a result of its temperature. Thermodynamics, a branch of chemistry, states how heat is transmitted through multiple systems and how work is done in the process by the virtue of the first law of thermodynamics.
The thermal energy speeds the movement and collision of the particles present within the system. It is found in electric heat, geothermal, coals, etc. It is due to the kinetic energy that allows the movement of the particles.
Therefore, option C. the kinetic energy contained in the particles results in thermal energy.
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One tank of gold fish is fed the normal amount of food once a day. A second tank is fed twice a day. A third tank is fed four times a day during a six week study. The fish's weight is recorded daily. What is the problem and the hypothesis?
Answer:
Problem: What is the effect of the amount of fish feed on the mass of goldfish?
Hypothesis: I think that feeding the goldfish four times a day will greatest increase in the mass of the goldfish.
Explanation:
The problem tends to ask question to which the research is conducted. It open ways for ideas towards a particular topic.
While the hypothesis is a tentative or assumed stand on a subject. It is further tested through an experiment or survey and if after many trials it gives same results and the obtained results is concordant with the hypothesis, the hypothesis will then become accepted and a theory or law is formed thereafter.
The use of uranium-238 to determine the age of a geological formation is a beneficial use of
O 1.
nuclear fusion
2.
nuclear fission
3.
radioactive isomers
4.
radioactive isotopes
Answer:
4- radioactive isotopes
Explanation:
I don't remember exactly but this question was on the regents
Uranium-238 is a non- fissile element. It is a radioactive isotope that can be best used to determine geological formations. Thus, option 4 is correct.
What are radioactive isotopes?Radioactive isotopes are elements that have an unstable atomic nucleus and can undergo radioactive decay to produce new particles and energy. They have the same atomic number as that of their parent species.
Isobars are a substance that has atomic mass and do not include uranium. Nuclear fusion and fission are the processes of nuclear energy that combine or splits the unstable nucleus to form a new particle.
Therefore, option 4. Uranium-238 is a radioactive isotope.
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What is a net ionic equation? A. An equation that shows only those particles involved in the reaction, and that is balanced for mass but not for charge B. An equation that shows only those particles involved in the reaction, and that is balanced for both mass and charge C. An equation that describes the flow of oxygen in a combustion reaction D. An equation that shows the cations as reactants and the anions as products
Answer:
B. An equation that shows only those particles involved in the reaction, and that is balanced for both mass and charge
Explanation:
A net ionic equation is a chemical equation that will only show the elements, compounds, and ions that are directly involved in the chemical reaction. It comes from the balanced molecular equation and should be balanced by both mass and charge.
Write an essay about the harm ful effects of sunlight to people. Minimum of ten sentences cite some expale of possible
Answer: See explanation
Explanation:
The sun is a star that's made up of several gases. It is known to be the most vital source of energy to living things.
Despite the importance of the sun in our lives, it's still harmful when one is exposed to it. They rays of light that's given our by the sun can be harmful to us.
Being exposed to the sun can cause sunburn and this can result in the damage of skin cells and development of cancer. Also, sunlight can lead to early aging as the skin ages faster when one is exposed to the sun.
Furthermore, exposure to sunlight can lead to eye injuries the tissue in our eyes can be damaged by the UV rays. Lastly, it also brings about lowered immune system.
How much water needs to be added
to 55 mL of 3.0 M stock solution to
produce a .75 M solution?
Answer:
165 ml
Explanation:
We are given;
Initial volume; V_a = 55 ml
Initial molarity; M_a = 3 M
Molarity of desired solution; M_b = 0.75 M
Volume of desired solution; V_b = (55 + x) ml
Where x is the volume of water to be added.
To solve for V_b, we will use the equation ;
M_a•V_a = M_b•V_b
V_b = (M_a•V_a)/M_b
V_b = (3 × 55)/0.75
V_b = 220 mL
Thus;
(55 + x) = 220
x = 220 - 55
x = 165 mL
Answer:
gotta concert mL to L
3.0=mol/0.055( you multiply morality and liter)
0.165 mol
you divide the mole by the other given molarity
0.165/0.75= 0.22 L
0.22 *1000= 220 mL
Explanation:
help me please
ive been here for hours
Answer:
A- Before the mechanic left, the molecules were moving away from each other. When she returned, they were moving around each other.
Explanation:
Brainliest?
Describe reflection, refraction, and absorption.
Answer:
Refraction is the bending of a wave when it enters a medium where its speed is different, like going from the air (gas) to a glass of water (liquid). Absorption is when light energy penetrates an object. Typically this energy is then converted to heat.
what is velocity measured in?
Answer:
units of length per time
Explanation:
How many grams of water react to form 4.50 moles of Mg(OH)2?
MgO(s) + H20(1)
Mg(OH)2(s)
Answer: mass of water is 81.1 g
Explanation: from reaction eguation you see there are equal amounts of water and Mg(OH)2. Then amount of water is 4.50 mol. Molar mass of water is 18.016 g/mol.
Mass m= n·M= 4.50 mol· 18.016 g/mol = 81.1 g
The number of grams of water reacting to form a mass of water is 81.1 g.
What is mass?Mass is the quantity of matter in a physical body.
The given reaction is
MgO(s) + H₂O(1) → Mg(OH)₂(s)
The number of moles is equal in both sides
The moles of water is 4.50
The molar mass of water is 18.016 g/mol
mass × molar mass
4.50 × 18.016 = 81.1 g.
Thus, the number of grams of water reacting to make a mass of water is 81.1 g.
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14. A 70 N tight rope walker is walking 20 meters above ground. About how much Gravitational Potential Energy does the performer have? 1,400 J 1,200 J 800 J
Answer:
It is 1,400 j
Explanation:
That is what i know
Answer:
1,400J
Explanation:
the formula for calculating Gravitational Potential Energy is mass×gravitational field strength×height
70×10×20=1,400
A solution of 6.2 M H2SO4 is diluted from 2.0 L to 3.0 L. What is the molarity of the resulting solution?
Answer:
Here's link to the answer:
bittuly/3a8Nt8
Explanation:
According to molar concentration, molarity of the resulting solution is 4.32 molar.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula M₁V₁=M₂V₂ gives M₂=6.2×2/3=4.32 M.
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What does the word Microbial mean?
Answer:
relating to or characteristic of a microorganism, especially a bacterium causing disease or fermentation.
Explanation:
ex: "skin is a major source of microbial contamination during a surgical procedure"
◕‿↼ Hey There!
Answer → Microbial means, relating to or characteristic of a microorganism, especially a bacterium causing disease or fermentation.
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Predict the electron pair geometry and the molecular structure of each of the following molecules or ions: (a) ClNO (N is the central atom); Determine: electron-pair geometry ; molecular structure ; (b) CS2; Determine: electron-pair geometry ; molecular structure ; (c) Cl2CO (C is the central atom); Determine: electron-pair geometry ; molecular structure ; (d) Cl2SO (S is the central atom); Determine: electron-pair geometry ; molecular structure ; (e) SO2F2 (S is the central atom); Determine: electron-pair geometry ; molecular structure ; (f) XeO2F2 (Xe is the central atom); Determine: electron-pair geometry ; molecular structure ; (g) ClOF2 (Cl is the central atom); Determine: electron-pair geometry ; molecular structure ;
Answer:
See explanation
Explanation:
In ClNO , nitrogen is the central atom here. The central atom has a tetrahedral electron pair geometry and a lone pair on the nitrogen atom. Due to the lone pair, the electron pair geometry is now trigonal pyramidal.
The molecule CS2 has a linear molecular geometry. There are four electron groups around the central atom hence the electron pair geometry is tetrahedral but the molecular geometry results from the repulsion of the two double bonds.
The electron domain geometry for Cl2CO is tetrahedral since there are four electron pairs around the central atom. However, the molecular geometry is trigonal planar due to the sp2 hybridization of the central carbon atom.
The electron domain geometry of Cl2SO is tetrahedral due to the four electron pairs around the central atom. However, due to the lone pair on sulphur, the molecular geometry is triagonal pyramidal.
In SO2F2, sulphur the central atom is surrounded by four electron pairs which are all bonding groups hence both the molecular geometry and the electron pair geometry is tetrahedral.
In XeO2F2, the central atom is Xe. There are five electron pairs around the Xe central atom four of which are bonding groups. The electron domain geometry and molecular geometry is trigonal bipyramidal.
For ClOF2 , the central atom Cl is surrounded by four electron pairs hence the electron pair geometry is tetrahedral but it is an AX3E(three bonding groups and one lone pair are present in the structure) specie hence it is trigonal pyramidal.
Please help I'm not sure what the answers are
Answer:
An element's mass number (A) is the sum of the number of protons and the number of neutrons. The small contribution of mass from electrons is disregarded in calculating the mass number.
please help
Why does a smoke detector use alpha radiation rather than beta or gamma radiation?
Answer:To be honest i dont know
Explanation:
e
Answer:
Explanation:
Alpha radiation ionizes the air. When smoke interaccts with the ionized particles it causes the alarm to sound.
Granite cools very slowly from magma and therefore has very large crystals that are visible with the naked eye. Granite can be classified as —
A.
an igneous rock.
B.
a metamorphic rock.
C.
a sedimentary rock.
D.
an extrusive rock.
Answer:
A
Explanation:
Igneous rock forms from cooled lava
8. Extinction of a species could result from
*
1
evolution of a type of behavior that produces greater reproductive success
synthesis of a hormone that controls cellular communication
limited genetic variability in the species
fewer unfavorable mutations in the species
Answer:
Limited Genetic Variability
Explanation:
its 3
Describe, in terms of subatomic particles, what occurs when a person experiences a static “shock”.
1. A sample of oxygen gas has a volume of 150 ml when its pressure is 440 mmHg. If the pressure is
Increased to standard pressure and the temperature remains constant, what will the new volume be?
Answer:86.84
Explanation:
make this and tell me how u like it its fat lady from hairy pawter find the pics on elgoog or use mine movie and site was changed its on scratch a web
Answer:
are u brocken
Explanation:
How many moles are in 56 L of CO2?
Answer:
we have four moles in 56L of co2
(this is science not chemistry)
I'm pretty sure ita A. acceleration
Answer:
it's a friction force
The number of protons in an atom is known as its atomic
A
number
B
mass
с
phase
D
bond
Answer:
the answer is A,atomic number
The annual production of sulfur dioxide from burning coal, fossil fuels,
auto exhaust, and other sources is about 130 million tons. When solid sulfur
reacts with oxygen gas it produces gaseous sulfur dioxide. What is the mass
in grams of sulfur that is needed to produce 2.30 Kg of sulfur dioxide?
*Don’t forget from your metric you were given that 1 Kg = 1000 g.
Answer:
1150g
Explanation:
The equation for producing sulphur dioxide is [tex]S + O_{2} ==> SO_{2}[/tex]
Looking at the ratios, you need 1 mole of sulphur for every 1 mole of sulphur dioxide
Sulphur dioxide has a molar mass of 32 + (2 x 16) = 64g
2.30 x 1000 = 2300
2300 / 64 = 35.9375
35.9375 x 32 = 1150g of sulphur
What is FALSE about nitrogen gas and carbondioxide?
1- Both are compounds
2- Both are gases
3- Elements in both substances are non-metals
4- Both are made up of atoms
Answer: Both are compounds
Explanation:
[tex]\text{N}_{2}[/tex] is an element, not a compound.
18) What is the following number representing: 10m/s West *
3 points
Force
Acceleration
Mass
Area
Pressure
Velocity
Speed
Impulse
Momentum
Speed
Explanation:
The distance travelled by a body per unit time