Answer:
D. It is polar, and the positive and negative areas attract other polar molecules and pull
them apart.
Explanation:
If the density of one substance is greater than that of another, the denser substance will _____ when it encounters the less-dense substance. If a substance's density is less than that of another substance, it will _____ on the denser substance.
Answer:
1. Sink
2. Float
Explanation:
Density of a substance refers to its mass per unit volume. Substances are of varying densities. Depending on the density of a substance, it can either sink or float in the presence of another substance with varying density.
If the density of one substance is greater than that of another, the denser substance will SINK when it encounters the less-dense substance. On the other hand, If a substance's density is less than that of another substance, it will FLOAT on the denser substance.
What particle is emitted during the following transmutation:
6729Cu→6730Zn+
____?
A.beta particle,
0−1e
B.
positron,
01e
C.alpha particle,
42He
D.gamma particle,
00γ
Answer:
A = ₋₁⁰e
Explanation:
Alpha beta and gamma radiations are the examples of ionizing radiations. When an atom is an excited state and having high energy, the atom is in unstable state. The excess of energy is released by the atom to get the stability. The released energy is in the form of radiations which may include alpha, beta, gamma, X-ray etc.
Beta radiations:
Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.
The mass of beta particle is smaller than the alpha particles.
They can travel in air in few meter distance.
These radiations can penetrate into the human skin.
The sheet of aluminum is used to block the beta radiation
⁶⁷₂₉Cu → ⁶⁷₃₀Zn + ⁰₋₁e
The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.
Answer:
A. beta particle,
0−1e
Explanation:
i just finished mine and it was correct
A scientist is studying a piece of cloth from an ancient burial site. She determines that 40% of the original carbon-14 atoms remain in the cloth.
Based on the carbon decay graph (Figure 11.27), what is the approximate age of the cloth?
A.5,000 years
B.8,000years
C.10,000 years
Answer:
The answer is B, 8,000 years.
Explanation:
If you look at the graph, match 40 percent to the 8th line and boom 8,000 years.
8,000years is the approximate age of the cloth. Hence, option C is correct.
What are atoms?An atom contains a central nucleus surrounded by one or more electrons.
carbon-14 dating is also known as radiocarbon dating which is a method of age determination that depends upon the decay to nitrogen of radiocarbon (carbon-14).
Hence, 8,000years is the approximate age of the cloth.
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Identify arrows pointing to structures containing pi bonds.
The arrows pointing to the structures containing pi bonds can be seen in the image attached below. From the assumed example Butan-1,3-diene , there are two pi bonds.
A bond is an attractive force designated by a dash (---) that holds atoms or ions mutually in a chemical bonding.
Covalent bonds exist in organic chemistry and they are of two types:
sigma bond σ -bondpi bond π-bondThe sigma bond (σ) exists as a single bond that occurs by the overlapping of an s-s atomic orbital or s-p atomic orbital. They can be seen in unsaturated straight chains such as alkane.
The pi bond (π) exists as a double bond or a triple bond that occurs by the overlapping of two unhybridized p-orbitals.
Since the diagram is not given, we use Butan-1,3-diene as an example of the required structure.
From the structure which is attached in the diagram below, we can see that there are two double bonds indicating the presence of pi-bonds.
Therefore, we can conclude that from the assumed example Butan-1,3-diene, there are two pi bonds.
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A scientist suggested that the movement of compound
X across a cellular membrane could be sped up by
the addition of enzyme Y. According to Figure 1, an
enzyme speeds the reaction because:
F. the activation energy is lower with the enzyme
than without the enzyme.
G. the activation energy is higher with the enzyme
than without the enzyme.
H. the activation energy is equal with and without
the enzyme.
J. the free energy change is higher with an enzyme
than without enzymes.
uhhhh sorry i have no idea try a different site
Explanation:
As one of the periodic trends studied in this unit, reactivity of metals varies in a
predictable manner. Of the elements listed, which one is the most reactive metal and
why?
A:Rubidium because it has a large atomic radius, a low ionization energy, and a low
electronegativity
B:Barium because it has a small radius, high ionization energy, and high
electronegativity
C:Aluminum because it has a small atomic radius and a small number of protons
D:Lithium because it has a smaller radius than most other metals
How would you finish the last sentence? What would you say to Sherman so he understands that velocity and force are different?
Answer:
Because force is what causes things to move or change while volactiy is when you add more energy and the things volactiy will change.
Explanation:
If I added 10 kJ of heat to a 100 g cube of copper and 10 kJ of heat to a 100 g cube of aluminum, which cube would experience a greater change in temperature. Explain your answer in terms of specific heat.
Answer:
The cube of copper
Explanation:
Cube of copper has a lower specific heat than the cube of aluminum. This pretty much shows that the lower specific heat, the higher change in temp.
(yeah i just found out how to do it like a minute ago cos its on my hw)
A cube of copper would experience a greater change in temperature in comparison with a cube of aluminum.
Given the following data:
Quantity of heat = 10 kJ = 10,000 JoulesMass of copper cube = 100 gMass of aluminum cube = 100 gSpecific heat capacity of aluminum = 0.89 J/g°CSpecific heat capacity of copper = 0.39 J/g°C.To determine which cube would experience a greater change in temperature:
Mathematically, quantity of heat is given by the formula;
[tex]Q = mc\theta[/tex]
Where:
Q represents the quantity of heat.m represents the mass of an object.c represents the specific heat capacity.∅ represents the change in temperature.Making change in temperature (∅) the subject of formula, we have:
[tex]\Theta = \frac{Q}{mc}[/tex]
For copper cube:
[tex]\theta = \frac{10000}{100(0.39)}\\\\\theta = \frac{10000}{39}[/tex]
Change in temperature ([tex]\theta[/tex]) = 256.41°C
For aluminum cube:
[tex]\theta = \frac{10000}{100(0.89)}\\\\\theta = \frac{10000}{89}[/tex]
Change in temperature ([tex]\theta[/tex]) = 112.36°C
Based on the above calculations, we can deduce and conclude that a cube of copper would experience a greater change in temperature in comparison with a cube of aluminum.
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How does the number of valence electrons in sodium (Na) compare to the number of valence electrons in calcium (Ca)?
calcium has one more valence electron than sodium.
calcium has 2 valence electrons, sodium has 1.
Answer:
Na has one fewer valence electron than Ca. I did it
Explanation:
other word for kindly
Answer:
other word for kindly is friendly
Answer: affectionately, thoughtfully, generous
How many dots should be placed around argon in a dot diagram? A) 2 C) 6 D) 8
The number of dots that should be placed around argon in a dot diagram is : ( D ) 8
Argon is a noble gas ( inert gas ) just like helium and neon and they have their outer most shell completely filled with its electrons ( 8 valence electrons ), which makes them non-reactive with any other element or compound.
Every valence electron in the Lewis structure of an atom is represented with a dot therefore the 8 valence electrons in Argon will be represented with 8 dots.
Hence we can conclude that the number of dots that should be placed around Argon in a dot diagram is 8.
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There should be 8 dots placed around argon in a dot diagram. The correct answer is option D.
A dot diagram is a way of representing the valence electrons of an atom using dots around the atomic symbol. Each dot represents one valence electron.
Argon is an element in the noble gas family with atomic number 18.The electron configuration of argon is[tex]\rm 1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^6[/tex], which means that it has 8 valence electrons.
In a dot diagram, argon should have 8 dots around it, representing the 8 electrons in its outermost shell.
Therefore, the correct answer is D) 8. Argon has a full valence shell of electrons, so in a dot diagram, it should have 8 dots around the atomic symbol to represent its 8 valence electrons.
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All phase change require energy to be taken away or added.
True
False
Answer:
true
Explanation:
Areas of Earth that are covered with copious amounts of water are part of
this sphere?
Biosphere
Geosphere
Hydrosphere
Monosphere
Answer:
Hydrosphere
Explanation:
Hydro meaning water
Which statement best describes how sediment forms?
A. Loose material is cemented by pressure.
B. Chemical changes cause sediment to compact together.
C. Weathering breaks down rock and other material.
D. Molten rock cools above Earth’s surface.
Answer:
C. Weathering breaks down rock and other material.
Explanation:
Answer:
Weathering breaks down rock and other material.
Explanation:
Have a nice day!!
QUOTE: " Out of the mountain of despair, a stone of HOPE. "- By: Martian Luther King JR.
Diffusion of water across the cell membrane is called ____
a. Diffusion
b. Osmosis
c. Concentration
Answer:
B Osmosis
Explanation:
Which biome would be nearest to the equator
what is The mass of an object if it's density is 12.00 g/mL and it's volume is 3.0 mL
Answer:
36
Explanation:
The formula for density is p=m/v. So we have to rearrange the formula.
It would look like this:
12.00 = m/3.0
From we would just solve by bringing the 3.0 to the other side and multiplying that to 12.00. Which gives us 36
How do scientists identify the bond type in a compound using the chemical formula
Answer:
How do scientists identify the bond type of a chemical formula? ... By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
Explanation:
Answer:
There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.
☆ I HOPE ITS HELP YOU ☆how many mg are equal to 450 ug?
Answer:
son 0,45 miligramos
Explanation:
espero que te haya dado una buena respuesta
Q: water is boiled and steam is produced. this is a physical change because the water particles A: a. have turned into something new b. are still water particles c. have reacted with each other d. have been destroyed
Explanation:
The appearance of the water has changed because it has gone from a liquid state to a gas state. This is a physical change because the water particles are still water particles and have not changed their identity.
also what is the arrow a pointing to?
How does atomic radius change from left to right across a period in the periodic table? A. it tends to decrease B. it tends to increase C. it first increases, then decreases D. it first decreases, then increases
Answer:
it decreases from left to right
Answer: It’s A. It tends to decrease.
Explanation:
Durning a chemical reaction, the law of_____ ______ states that the total mass of the products must be equal to the total mass of the recent
Answer: conservation of mass
Explanation:
What is the maxlmum number of electrons that can be present in each principal energy level of hydrogen?
Answer:
Two electrons
Explanation:
-
Rocks found in streams can have rough edges and sharp grooves. What is the process that roughened the edges and caused the grooves
Answer:
Metamorphism
Explanation:
Rocks found in streams can have rough edges and sharp grooves. Metamorphism roughened the edges and caused the grooves.
What is rock?Rock is a naturally occurring mineral aggregate that is cohesive and composed of one or even more minerals. These aggregates often take the shape of recognisable and mappable volumes and are the fundamental building block of the solid Earth.
Igneous rocks are the ones that develop from magma, a liquid mixture of minerals that form rocks as well as frequently volatile substances like gases and steam. Igneous rocks are created at high temperatures because the minerals that make up its components are crystallized form molten material. Rocks found in streams can have rough edges and sharp grooves. Metamorphism roughened the edges and caused the grooves.
Therefore, metamorphism roughened the edges and caused the grooves.
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The lanthanides and Actinides, Which Include All of the F-block Elements, Display Which Properties?
- They are more reactive than the alkali metals
- They can form cations with various charges
- They have low atomic mass
- They only form ions with a +4 charge
- They form covalent bonds with halides
- They are less reactive than the group 1A elements
The functions carried out by all types of cells are functions that allow the
cell to?
A: create new life
B:adapt to environment
C: sustain life
Answer:
They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body's hereditary material and can make copies of themselves. Cells have many parts, each with a different function
Explanation:Its A
helppp ASAP....The overall charge of a formula unit for an ionic compound ____.
Group of answer choices
A.is always zero (neutral)
B.it is always positive
C.is always negative
D. it may have any value
Answer:
onic compounds contain positively and negatively charged ions in a ratio that results in an overall charge of zero
Explanation:
Thats what I found when I looked it up but I didnt know what answer choice to pick out of that so Ill let you do it
Answer:
A. is always zero
Explanation:
In all cases the charge on the sum of the anions is equal to the charge on the sum of the cations, to give a neutral salt
Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. Marie places masking tape in the dry shower to create 5 sections for her experiment. She sprays one cleaner per section and leaves the remaining section untouched to compare her results. After 30 minutes, and without scrubbing any of the cleaner in, she records her observations. In this example, what is the dependent variable?
Answer:
CUT through the hardwater stains
Explanation:
The dependent variable in an experiment is the variable that the experimenter measures. It is the variable that responds to changes made to the independent variable.
In this experiment, Marie conducted an experiment to test which cleaner will do a better job of cutting through the stains (hard water buildup). She measures the cut through the stain, hence, the CUT is the dependent variable, which is dependent on the cleaner used.
What is the acceleration that this box will move? (Don't forget your units)
Answer:
160 I think or 200
Explanation:
the lines are pulling on the same side so you add those
