Answer:
That would be a physical change
Explanation:
A physical change is when you are changing the physical properties of something but not changing its overall identity and a chemical change is when yo are changing the physical properties and changing its identity .
Ex. Ripping a dollar bill- Physical change
Burning a dollar bill- chemical change
Answer:
first one is physical , second one is chemical
Explanation:
What is the name of Se2Cl7?
Answer:
diselenium heptachloride
Explanation:
Se2Cl7
Se = selenium
Cl = chlorine
Don't forget the "-ide"
Diselenium heptachloride
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 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.
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:
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
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?
What is the composition of ordinary glass
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)
To know more about the molecule and fixed composition.
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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:
The following equation is balanced according to the Law of Conservation of Mass:
2 NO + O2 → 2 NO2
True
False
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 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
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.Which family does sodium belong to?
Answer:
sodium is a member of the alkali metal family
Explanation:
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.
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.
Consider the balanced equation:
3Mg(OH)2 + 2H3PO4 Mg3(PO4)2 + 6H20
If you have 3 moles of Mg(OH)2, how many moles of water will be produced?
A
2
B
3
6
D
1
Answer:
A). 3 Mg, 2 P, 14 O, 12 H
Explanation:
The source of alpha particles in a smoke detector is the
The source of alpha particles in a smoke detector is the Americium.
5. Infer: Which group has high ionization energies but very weak electron affinities?
Why do you think this is so?
Answer:
The group that has high ionization energies but very weak electron affinities is the group 18, (VIIIa) which are the noble gases, the group of elements including; He, Ne, Ar, Kr, Xe, Rn, and Og in the column, at the far right corner of the periodic table
The electronic configuration of the noble gases show that they have the complete octet or 8 electrons (or duplet, 2 electrons, for helium) in their valence shell, therefore, they are relatively stable and seldom take part in chemical reaction which requires the transfer of electrons
Therefore, the noble gases have high ionization energies (require high amount of energies to remove an electron) and low electron affinity (they require an input of energy before an electron can attached to them)
Explanation:
The group having high ionization energies, but weak electron affinities is group 18 of noble gases.
Ionization energy can be defined as the amount of energy required for the removal of electrons. In noble gases, the elements have stable electronic configuration, they require a high amount of energy for removing an electron. Thus they have high ionization energy.
Electron affinity has been the energy required for the addition of an electron. The electron affinity for the addition of electrons has been zero as they are stable elements, and do not require the addition of an electron.
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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
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 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:
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.
How does the law conservation of matter apply to machines
Can someone help me please ?
Answer:
B
Graph 1 is An endothermic reaction and graph 2 is an exothermic reaction
An unknown substance has a density of 56 g/cm3. Its volume is 3.5 cm.
What is the mass of this unknown substance?
Answer:
The answer is 196 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 56 × 3.5
We have the final answer as
196 gHope this helps you
Please help click the picture
Answer
D
Explanation:
The formula is going to be Products / Reactants.
That means only B and D can be correct. The balance numbers to the equation are the powers which means that the answer is D
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:
what is the measure of the amount of matter in a given amount of space
Answer:
volume
Explanation:
it is always measured in volume