What would be the charge on an ion whose neutral atom has an electron configuration of 2.8.7?
A. +1
B. 0
C. +7
D. -1
Answer:
A
Explanation:
The following equation is balanced according to the Law of Conservation of Mass:
2 NO + O2 → 2 NO2
True
False
Which of the following statements is true about cells?
A. All cells look the same.
B. All cells perform the same function.
O C. All cells perform specialized functions.
O D. All cells are prokaryotic.
Answer:
Explanation: i think it is C if i'am wrong i'am sorry
How many oxygen atoms are in 15.0 grams of Magnesium phosphate?
Answer:
8 atoms of oxygen.
Explanation:
Given parameter:
Mass of magnesium phosphate = 15g
Unknown:
Number of oxygen atoms = ?
Solution:
The formula of the compound is;
Mg₃(PO₄)₂;
Number of atoms oxygen = 2(4) = 8 atoms of oxygen.
A student is given a sample of an unknown liquid to test in the laboratory. The student thinks that the liquid is water. Which of the following properties of the sample is most helpful to determine if the liquid is water?
Answer:
This question is incomplete, the options are:
(A) color of the liquid
(B) mass of the liquid
(C) the volume of the liquid
(D) the boiling point of the liquid
The answer is D
Explanation:
Substances at different states usually possess certain properties that distinguishes them. For example, in this case involving a student who was given a sample of an unknown liquid to test in the laboratory, he thinks that the unknown liquid is water. Specific properties of the unknown liquid can be used to identify whether it is water or not.
One property that can be used to ascertain whether or not it is water is the boiling point of the liquid. This is because specific liquids have specific boiling point. So if the unknown liquid has a boiling point of 100°C, then it can be ascertained to be water.
can Someone help me with this
Answer:
1. Mg²⁺ 2. Cl⁻ 3. PO₄³⁻
Explanation:
Answer:
1. Mg²⁺
2. Cl⁻
3. PO₄³⁻
Explanation:
Feel free to give brainliest.
Have a great day!
Which family does sodium belong to?
Answer:
sodium is a member of the alkali metal family
Explanation:
1.5 mol of the complex substance carbon dioxide (CO2) is just a few oxygen atoms:
Answer:
9.03 x 10²³atoms
Explanation:
Given parameters:
Number of moles of CO₂ = 1.5mol
Unknown:
Number of atoms = ?
Solution:
In a mole of a substance, we have the Avogadro's number of particles which is 6.02 x 10²³atoms.
Using this number, we can determine the amount of atoms in any substance.
If;
1 mole of CO₂ contains 6.02 x 10²³ atoms;
1.5mole of CO₂ will contain 1.5 x 6.02 x 10²³ atoms
= 9.03 x 10²³atoms
What is the name of Se2Cl7?
Answer:
diselenium heptachloride
Explanation:
Se2Cl7
Se = selenium
Cl = chlorine
Don't forget the "-ide"
Diselenium heptachloride
Dynamite consists of nitroglycerine mixed with diatomaceous earth or cellulose. What is another
name for dynamite?
oKBT
oKOH
oTNT
oC-4
oCFC
Answer:
oTNT
Explanation:
Another name for the explosive dynamite is TNT, Trinitrotoluene.
Dynamite is an explosive that finds a wide range of application in many mining processes.
It was created by one of the Nobel brothers in the late 19th century. The explosive is made up of explosive sticks with a wick and blasting cap. They cause very strong explosion when detonated.Now we know that atoms are built from even __________ particles
Answer:
protons, neutrons and electrons
Explanation: Can you pls give be branily thanks*
Answer:
smaller particles?
PLZ ANSWER QUICKLY! The electronegativity values of carbon, hydrogen, and nitrogen are compared in the table. Comparison of Electronegativity Element Electronegativity Carbon 2.5 Hydrogen 2.1 Nitrogen 3.0 Which of the following statements is true about the strength of the intermolecular forces in CH4 and NH3? (4 points) Select one: a. CH4 ≥ NH3 because CH4 is tetrahedral but NH3 is pyramidal. b. CH4 < NH3 because δ− on C in the CH bond is greater than δ− on N in the NH bond. c. CH4 < NH3 because the NH bond is more polar than the CH bond. d. CH4 ≥ NH3 because CH4 has H bonding but NH3 has dispersion forces.
Answer:
c. CH4 < NH3 because the NH bond is more polar than the CH bond.
Explanation:
Actually, the electronegativity difference between carbon and hydrogen is just about 0.4. This meager difference in electronegativity corresponds to a nonpolar bond between the two atoms.
However, the electronegativity difference between nitrogen and hydrogen is about 0.9. This larger electronegativity difference corresponds to the existence of a polar covalent bond between the two atoms.
Hence the N-H bond is significantly polar unlike the C-H bond. This implies that CH4 molecules are only held together by weak dispersion forces while NH3 molecules are held together by stronger dipole-dipole interactions and hydrogen bonds.
Answer:
CH4 < NH3 because the NH bond is more polar than the CH bond.
Explanation:
An elements had three isotopes, determine the average atomic mass and
element.
1x - percent abundance = 80%, mass = 127
2x - percent abundance = 17%, mass = 126
3x - percent abundance = 3% , mass = 128
Answer:
126.86
Explanation:
Given parameters:
1x - percent abundance = 80%(0.8), mass = 127
2x - percent abundance = 17%(0.17), mass = 126
3x - percent abundance = 3%(0.03) , mass = 128
Unknown:
Average atomic mass = ?
Solution:
The average atomic mass is the average of all isotopes of element. It can be calculated using the expression below;
RAM = (mass x abundance of 1x) + (mass x abundance of 2x) + (mass x abundance of 3x)
Now insert the parameters and solve;
RAM = (127 x 0.8) + (126 x 0.17) + (128 x 0.03) = 126.86
What is this please help
Answer:
I think the answer is A. I am only 50% sure I am correct, but hope it helps!
Explanation:
SOMEONE PLEASE ANSWER THIS IM TIMED ON MY TEST
When petrol is burned inside a car engine it reacts with oxygen from the air. the products are carbon dioxide and water. carbon dioxide is thought to contribute to climate change so some cars now do not use petrol as the fuel. they use hydrogen instead, when hydrogen is burned in oxygen no carbon dioxide is produced. just water.
write a word equation for both reactions;
use " - - >" for the arrow in your equations.
PLS ANSWER ILL MARK BRAINLIST PLEASE
it provides carbon dioxide and rhen it goes through the car and gives the gas oxygen
How is a joule defined?
A. It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter.
B. It is the force needed to make an object with a mass of 1 kilogram accelerate by 1 kilogram per second squared.
C. It is the force needed to make an object with a mass of 1 kilogram travel 1 meter.
D. It is the work done when a force of 1 newton is applied to accelerate an object by 1 kilogram per second squared.
Answer:
A. It is the work done when a force of 1 newton is applied to an object for a distance of 1 meter
Explanation:
The work done when a force of 1 newton is applied to an object for a distance of 1 meter is called as joule. Therefore, option A is correct.
What do you mean by work done ?The term work done is defined as whenever work is done, energy is transferred.
To move an object, it must be converted into energy. The method of force can be used to transfer energy. Work done is the amount of energy transferred by a force to move an object.
Work can be calculated using the formula: Work = Force Distance. The joule (J) or Newton meter (N m) is the SI unit for work. One joule is the amount of work done when one Newton of force moves an object one meter.
Thus, The work done when a force of 1 newton is applied to an object for a distance of 1 meter is called as joule, option A is correct.
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When baking, the rods in an oven heat up and turn red. This is an example of
A. an object emitting radiation as its temperature is above 0°C.
B. an object emitting conduction as its temperature is above 0°C.
C. an object emitting radiation as its thermal boundary layer is above 0°C.
D. an object emitting conduction as its thermal boundary layer is above 0°C.
a
b
A
B
с
D
d
Answer:
The most correct option is A
Explanation:
The correct option is A because all objects emit thermal radiation when there temperature is higher than absolute zero - this is based on the Stefan-Boltzmann law. Hence, when the rods in an oven heat up above absolute zero, they begin to start emitting radiation. It should noted at this point that objects do not "emit" conduction and thus all options that involved "emitting conduction" are subsequently wrong.
What is the difference between the units rem and rad?
Rem is a conventional unit, and rad is an Sl unit.
O Rem is an Sl unit, and rad is a conventional unit.
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Rem is used to measure absorbed radiation, and rad is used to measure biological risk.
Answer:
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Explanation:
Answer:
Rem is used to measure biological risk, and rad is used to measure absorbed radiation.
Explanation:
Here is an image to prove that this is correct. Did on Edge
Can someone help me please ?
Answer:
B
Graph 1 is An endothermic reaction and graph 2 is an exothermic reaction
In an
The mass of a small stone was 27 g.
. The reading of the level of water in the graduated cylinder was 10 cm before the
stone was placed into the overflow can.
The reading of the level of water was 19 cm after the stone was placed into the
overflow can
(a) Calculate the volume of the stone.
(b) Calculate the density of the stone.
Answer:
d = 3 g/cm³
Explanation:
Given data:
Mass of stone = 27 g
Volume of water = 10 cm³
Volume of water+ stone = 19 cm³
Volume of stone = ?
Density of stone = ?
Solution:
Volume of stone = total volume - volume of water
Volume of stone = 19 cm³ - 10 cm³
Volume of stone = 9 cm³
Density of stone:
d = m/v
d = 27 g/ 9 cm³
d = 3 g/cm³
how much would the boiling point of water increase if 4 mol of NaCl were added to 1 kg of water (Kb=0.51 C/(mol/Kg) for water and i = 2 for NaCl
Answer:
4.08
Explanation:
PLEASE HELP!!! Which action will increase the gravitational force between two objects?
A chemist added hydrochloric acid to a sample of baking soda in a beaker. Immediately, the mixture of the two chemicals began to fizz and bubble. Which of the following observations about the fizzing mixture provides evidence of a chemical
reaction?
A. The temperature of the beaker did not change.
B. A substance escaped from the beaker in the form of a gas.
C. Some of the baking soda remained in the bottom of the beaker.
D. Most of the baking soda appeared to dissolve in the acid.
Answer: B
Explanation:
The observations about the fizzing mixture provide evidence of a chemical reaction is A substance escaped from the beaker in the form of a gas. The correct option is B.
What is a chemical reaction?A chemical reaction is a process of forming a compound from two substances. The substance that reacts to create a compound is called a reactant, and the compound that is formed after the reaction is called a product.
In a beaker, a chemist mixed hydrochloric acid with a sample of baking soda. The two chemicals together instantly started to bubble and fizz. Fizz is the bubbles that are made in the reaction, they are realized in the environment. Thus, they have escaped from the beaker.
Thus, the correct option is B. A substance escaped from the beaker in the form of a gas.
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In this experiment, what is the independent variable?
A.) The number of worms
B.) The type of worms
Answer:
i think it would be B.
Explanation:
what is soul of nature?
Answer:
well I dont know much about it but....
I think the soul if nature is kind if like a goddess which provides us the reason to live and the reason to die.
I guess thats it :/
Answer:
The human soul is naturally and essentially immortal; it is uncreated and eternal. The soul passes from one body to another through a series of many incarnations. After paying off its sin (karmic debt), the soul is liberated from somatic existence and lives in a totally blissful state.
Explanation:
hope it helps you
what is the frequency of green light that has wavelength of 5.5x10⁷m?
Answer:
5.5Hz
Explanation:
Given parameters:
Wavelength of green light = 5.5 x 10⁷m
Unknown:
Frequency of the wave = ?
Solution;
Green light is a part of the electromagnetic spectrum. The speed of all these rays in free space is 3 x 10⁸m/s
So;
V = fλ
V is the speed
f is the frequency
λ is the wavelength;
So;
F = [tex]\frac{V}{wavelength}[/tex]
Insert the parameters and solve;
F = [tex]\frac{3 x 10^{8} }{5.5 x 10^{7} }[/tex] = 5.5Hz
Table salt (NaCl) is a compound. Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as ____________.
A. atomic number
B. fixed composition
C. a formula
D. a heterogeneous mixture
Table salt (NaCl) is a compound. Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as fixed composition.
Hope this helps! Please correct me if I'm wrong :)
Every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".
What is fixed composition?A chemical compound has a predictable makeup. Every sample of a compound has almost the same composition, or even the identical proportion, by mass, of the components contained in the compound, as per Proust's reasoning.
What is a molecule?Atomic building blocks make up molecules.
Therefore, every molecule of table salt has the same properties as every other molecule of table salt because they all have one sodium (Na) atom and one chlorine (Cl) atom. This is referred to as " fixed composition".
Hence, the correct answer will be option (B)
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1. an ancient study or art which attempted to combine science and philosophy to solve worldly problems alchemy 2. a homogeneous mixture of elements with metals to form metallic solids alloy 3. the simplest unit of an element that still retains the properties of that element compound 4. two or more elements joined together such that the elements have lost their individual identity element 5. a primary substance that cannot be divided into separate substances metal 6. the group of elements that are good conductors of electricity and heat atom 7. the group of elements that are poor conductors of electricity and heat
Answer:
1. Alchemy
2.Alloy
3.Atom
4.Compound
5. Element
6. Metal
7. Non metal
Explanation:
1. An ancient study or art which attempted to combine science and philosophy to solve worldly problems is alchemy
2. A homogeneous mixture of elements with metals to form metallic solids is an alloy
3. The simplest unit of an element that still retains the properties of that element compound is an atom.
4. Two or more elements joined together such that the elements have lost their individual identity element is called a compound
5. A primary substance that cannot be divided into separate substance is an element
6. The group of elements that are good conductors of electricity and heat is called a metal
7. The group of elements that are poor conductors of electricity and heat are called non metals.
What is the composition of ordinary glass
Imagine that a cold snap hits Florida in February. Would it be cooler along the coast or further inland? Plz plz plz anwswr quick
Along the coast, its always colder near water