Answer:
Thomson passed an electric current through sealed glass tubes filled with gases. Thomson concluded that electrons must be parts of the atoms of all elements. Millikan determined the charge and mass of the electron.
Explanation:
Thompson discovered electrons and proposed the plum - pudding model of the atom. Millikan measured the charge to mass ratio of an electron.
In the early days of the atomic theory, working with his cathode ray tube, J.J Thompson discovered electrons. His discovery of electrons led him to propose a model which depicted the atom as a sphere of positive charges into which negative charges were embedded. This is the plum-pudding model of the atom.
Using his famous oil-drop experiment, R.A Millikan successfully measured the charge to mass ratio of the electron and thereby determined the magnitude of charge on the electron.
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Which of the following configurations would form a bent molecule?
A. A molecule with three bound atoms and no lone electron pairs
B. A molecule with two bound atoms and no lone electron pairs
C. A molecule with one bound atom and two lone electron pairs
D. A molecule with two bound atoms and one lone electron pair
Answer:
D
Explanation:
Apex
Answer: D
Explanation:
A P E X ( I just clicked it and it’s right)
Answer question number 3
What causes the change within every twenty four hours from day to night on Earth?
A)
Earth's rotation on its axis
the tilt of Earth on its axis
Tarth's revolution around the sun
the distance from Larth to the Sun
Tamashenomena on the top of the sun that appear as dark spots compar
Please answer
Answer:
Earth's rotation.
Explanation:
Most of the options are obviously incorrect, with the exception of tilt. However, tilt is the cause of seasons, not days.
Answer: Earth's rotation on its axis
Explanation:
A 15 % salt (NaCl)solution is made with 750.0 grams of solution. What is the mass of sodium chloride used to make the solution?
Define the concept of Energy in your own words
Answer:
In general, the word energy refers to a concept that can be paraphrased as "the potential for causing changes", and therefore one can say that energy is the cause of any change. The most common definition of energy is the work that a certain force (gravitational, electromagnetic, etc) can do. Due to a variety of forces, energy has many different forms (gravitational, electric, heat, etc.) that can be grouped into two major categories: kinetic energy and potential energy. According to this definition, energy has the same units as work; a force applied through a distance. The SI unit of energy, the joule, equals one newton applied through one meter, for example. Energy has no direction in space, and is therefore considered a scalar quantity. Energy is a conserved quantity, meaning that it cannot be created or destroyed, but only converted from one form into another. Thus, the total energy of the universe always remains constant. One form of energy can be readily transformed into another; for instance, a battery converts chemical energy into electrical energy.
Explanation:
How many grams are in 5.90 moles of C8H18?
Mass =672.6 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt mol=\dfrac{mass}{MW}[/tex]
MW = molecular weight
MW C₈H₁₈ = 8x12 + 18 x1 = 114 g/mol
mass:
[tex]\tt mass=mol\times MW\\\\mass=5.9\times 114=672.6~g[/tex]
Jakasia needed to find the volume of a plastic container in L to see if the 170 L of
solution that she had would fit inside. She knew that one side was 2.5 ft, the
height of the box was 60 cm, and width of the box was 0.8 m. Use dimensional
analysis to determine if Jakasia's solution will fit in the container.
Answer:
The solution will fit into the container.
Explanation:
The following data were obtained from the question'
Volume of solution = 170 L
Length of container (L) = 2.5 ft
Height of container (H) = 60 cm
Width of container (W) = 0.8 m
Volume of container (V) =?
Next, we shall express the length, height and breadth I the same unit of measurement. In this case, we shall all in centimetres (cm).
For the length:
1 ft = 30.48 cm
Therefore,
2.5 ft = 2.5 ft × 30.48 cm / 1 ft
2.5 ft = 76.2 cm
Thus the length is 76.2 cm
For the width:
1 m = 100 cm
Therefore,
0.8 m = 0.8 m × 100 cm / 1 m
0.8 m = 80 cm
Thus, the width of the container is 80 cm.
Next, we shall determine the volume of the container as follow:
ength of container (L) = 76. 2 cm
Height of container (H) = 60 cm
Width of container (W) = 80 cm
Volume of container (V) =?
Volume = length × width × height
Volume = 76.2 × 80 × 60
Volume = 365760 cm³
Finally, we shall convert 365760 cm³ to litre (L). This can be obtained as follow:
1000 cm³ = 1 L
Therefore,
365760 cm³ = 365760 cm³ × 1 L/ 1000 cm³
365760 cm³ = 365.76 L
Therefore, the volume of the container is 365.76 L
Since the volume of the container (i.e 365.76 L) is bigger than the volume of the solution (i.e 170 L), therefore, the solution will fit into the container.
name two metals which are malleable or ductile
Answer:
Copper and Silver are both malleable and ductile
Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?
A stable arrangement of eight valence electrons : ³⁵Cl⁻¹
Further explanationChlorine is a halogen gas, located in group 17, p block
Chlorine has an atomic number of 17 and an atomic mass of 35
Electron configuration: [Ne] 3s²3p⁵
If we look at the electron configuration, then Cl will bind 1 more electron so that the configuration is stable like Argon (atomic number 18)
So by binding this one electron, chlorine forms negative ions (anions)
³⁵Cl⁻¹
B. Cl⁻² binds 2 electrons, exceeding the octet rule
C. Cl⁺¹, releases 1 electron, remains unstable
D. Cl, the neutral form of Cl, is still unstable with a 7-electron valence configuration
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:
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
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
Which is the balanced equation for S8 + O2 → SO2?
S8 + O16 → 8SO2
S8 + O2 → S8 + O2
S8 + O2 → S8O2
S8 + 8O2 → 8SO2
Answer:
The answer is A S8 + O16 → 8SO2
Explanation:
The balanced chemical equation is -:
S₈ + O₂-----> 8SO₂ therefore (d) is correct .
What do you mean by balanced chemical equation ?A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.
Methods to balance the chemical equation -:
The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.
The coefficients in front of the formulas to show how many molecules of that material are used or produced.
Hence , the balanced chemical equation is -:
S₈ + O₂-----> 8SO₂ ,hence option (d) is correct .
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A roller skater has a mass of 75 kg and accelerates at 1.5 m/s 2 squared. What is the net force acting on her?
Answer:
The answer is 112.5 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 75 kg
acceleration = 1.5 m/s²
We have
mass = 75 × 1.5
We have the final answer as
112.5 NHope this helps you
What is the relationship between ionization energy and
electronegativity based on these cards?
Answer: here u go
Explanation:
The ionization energy can be thought of as a kind of counter property to electronegativity in the sense that a low ionization energy implies that an element readily gives electrons to a reaction, while a high electronegativity implies that an element strongly seeks to take electrons in a reaction.
Answer: Ionization energy is the energy required to remove an electron from a neutral atom in its gaseous phase.
Explanation: Conceptually, ionization energy is the opposite of electronegativity. The lower this energy is, the more readily the atom becomes a cation.
The Mass of the mineral is 9.6 grams . The mineral is placed in a graduated cylinder containing 8.0 ml of water . The water rises to 16.0 ml of water. What is the Density of the mineral ?
Answer:
1.2 g/ ml
Explanation:
The volume of the mineral = increase in volume of the water whuich is 16 - 8 = 8mls.
Therefore the mineral's density = 9.6 / 8
= 1.2 g/ ml answer
Draw a structural formula for the alkene you would use to prepare the alcohol shown by hydroboration/oxidation.
Answer:
See explanation
Explanation:
The question is incomplete because the image of the alcohol is missing. However, I will try give you a general picture of the reaction known as hydroboration of alkenes.
This reaction occurs in two steps. In the first step, -BH2 and H add to the same face of the double bond (syn addition).
In the second step, alkaline hydrogen peroxide is added and the alcohol is formed.
Note that the BH2 and H adds to the two atoms of the double bond. The final product of the reaction appears as if water was added to the original alkene following an anti-Markovnikov mechanism.
Steric hindrance is known to play a major role in this reaction as good yield of the anti-Markovnikov like product is obtained with alkenes having one of the carbon atoms of the double bond significantly hindered.
HELP ME ASAP PLEASE IDK THIS
Answer:
cExplanation:
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
In Ionic compounds the charges of the cation and anion should cancel out.
True
False
what happened to the shape of the water when it was poured into a bottles water
Answer:
Its still a liquid, only it takes form of the bottle.
Explanation:
When you pour a liquid (water) in a bottle, the water is still water but the water takes shape of the bottle. Hope this helps! Let me know if you need clarification.
1. An atom has 57 neutrons and 42 protons. How many electrons will this atom have if it
neutral?
57
44
42
40
Answer:
42
Explanation:
Because the proton number or atomic number is equal to electron number.
Answer:
42
In order for it to be neutral there must be the same amount of protons and neutrons
Have a nice day! :)
How many moles of NH3 can be produced from 3.76 moles of nitrogen
in the following reaction:
N2 (g) + 3 H2 (g) → 2 NH; (g)
The number of moles of NH₃ obtained from the reaction is 7.52 moles
The balanced equation is given below:
N₂ + 3H₂ —> 2NH₃From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Finally, we shall the number of mole of NH₃ produced by the reaction of 3.76 moles of N₂. This can be obtained as follow:
From the balanced equation above,
1 mole of N₂ reacted to produce 2 moles of NH₃.
Therefore,
3.76 moles of N₂ will react to produce = 3.76 × 2 = 7.52 moles of NH₃.
Thus, 7.52 moles of NH₃ were obtained from the reaction.
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which of these elements is most likely to be magnesium the most metallic of all samples?
Answer:
B
Explanation:
Just did it on usa test prep
The element which is most likely to be magnesium is the element with the electronic configuration same as magnesium.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
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Choose ALL the answers that apply.
The stomach____
receives food from the esophagus
absorbs extra water
breaks down food
mixes, mashes, and churns food
absorbs digested nutrients
Answer: absorbs food, breaks down food
Answer:
Breaks down food, mixes mashes, and churns food.
Explanation:
These are the correct answers because the stomach does those functions. The small intestine is responsible for absorbing digested nutrients. The pharynx food from the esophogus.
HELP!!!!PLEASE which to terms describe how waves the them blue light are different from waves of bright red light? A. Higher amplitude B. Lower amplitude C. Longer wavelength D. Shorter wavelength choose two answers
Answer:
shorter wavelength and lower ampiltude
Explanation:
i just did this question
Answer:
B and D
Explanation:
I just took the test and got it correct ;)
When does the placenta begin to form?
Answer:
By week 12, the placenta is formed and ready to take over nourishment for the baby. However, it continues to grow throughout your pregnancy. It's considered mature by 34 weeks.
Explanation:
Which of the following contains the GREATEST number of atoms of argon gas?
20.0 g of Ar
5.0 L of Ar at STP
6.02 x 10^23 atoms of Ar
0.75 moles of Ar
Sodium, an alkali metal, and chlorine, a halogen, are both in Period 3 of the periodic table. Which element has
a higher ionization energy? Explain your answer.
Answer:
Chlorine has higher ionization energy.
Explanation:
Sodium is present on left side of periodic table in period 3 while chlorine is present on right side of periodic table in period 3.
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required. Thus chlorine have higher ionization energy as compared to the sodium.
At the top of a hlgh mountaln, the welght of an object Is:
O the same as that at sea level
O less than at sea level
Ogreater than at sea level
