Answer:
c. plastic is an insulator
Explanation:
a and b are metals which are conductors and d contains water which is also a conductor
CAN SOMEONE PLEASE HELP ME WITH THIS
Answer:276ml
Explanation:
A student would like to test the effect of eating a lot of candy on
student hyperactivity. She sets up two groups for her experiment and
measures her results in the number of times a student jumps out of their
seat. What is the independent variable?
Answer:
Number of candies
Explanation:
The independent variable in this experiment is the number of candies eaten by the student.
An independent variable is best pictured as the cause in an experiment. It is the reason why the effects in experiments are produced.
In this experiment, the hyperactivity is the hyperactivity is the dependent variable. It is the effect that is produced in this set up.
Answer:
Just to make it short, its eating a lot of candy
Explanation:
why chemical reactions are important to society?
How many Joules of heat are needed to melt 3.0 g of ice?
Answer:A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing - even though energy is still being transferred
Explanation:imm not sure
Which chemical family below would the element iodine most likely belong to?
The chemical family that the element iodine should belong to is halogen.
The following information related to the halogen is:
It is the subset that has chemical elements i.e. reactive. It is in Group 17 on the periodic table that should be existed in the environment as the compounds instead of the pure elements.The other type of halogens should consist of fluorine (F), chlorine (Cl), etc.Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.
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How do changes in wind currents affect the short-term climate in a region?
Prevailing winds can cause a milder climate with heavy rain.
Global winds can cause a longer summer.
Prevailing winds can cause heavy rains or a dry climate.
Global winds can cause a longer winter.
Answer:
a
Explanation:
Prevailing winds can cause a milder climate with heavy rain is the change that affects the short-term climate in a region, hence option A is correct.
What is wind currents?Concentrated areas of winds are known as air currents. They primarily result from variations in the temperature or atmospheric pressure.
The horizontal and vertical currents are present at the mesoscale, whereas horizontal currents predominate at the synoptic scale.
A region's short-term climate can be dramatically impacted by changes in wind currents. As they move moisture from one place to another, prevailing winds can result in a milder climate with heavy rain.
As a result, the impacted area may see higher precipitation and a more temperate environment.
Therefore, prevailing winds can cause a milder climate with heavy rain can impact the short-term climate in a region.
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Which of the following trends decrease down group 1 from Li → Cs?
I. melting point
II. jonization energy
III. atomic radius
A.
I and II only
B.
II and III
C.
II and IIl only
D.
I and III only
Answer:
A. I and II only
Explanation:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Melting point also goes to decreases because there is large distance between the positive nucleus and bonded electrons thus overall attraction goes to reduced and less energy is required to melt.
Distinguishing Types of Waves through Examples
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves.
How should the table be changed to correctly distinguish between mechanical and electromagnetic waves?
Earthquake waves and radiation waves need to change places.
Light waves and X-ray waves need to change places.
Ocean waves and X-ray waves need to change places.
Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places.
Explanation:
Given table:
Mechanical waves Electromagnetic waves
Ocean water Sound waves
Light waves Radiation waves
Earthquake waves X-ray waves
From the given table, to be correct, light and sound waves must change their position.
Light wave is an electromagnetic wave
Sound wave is a mechanical wave
An electromagnetic wave does not require a material medium for propagation.
Mechanical waves require material medium for their propagation.
Mechanical waves Electromagnetic waves
Ocean water Light waves waves
Sound waves Radiation waves
Earthquake waves X-ray waves
Answer:
Sound waves and light waves need to change
Explanation:
Which element would have chemical reactions most similar to fluorine (F)?
A. O
B. Br
C. Ne
D. Fm
giving brainliest if right
[tex]\mathrm {Hey, there!}[/tex]
The answer is: Bromine
Oxygen is not similar to flourine, it is not a noble gas with high ionization.
Neon does not have chemical reactions like flourine.
The answer is Bromine! Best of Luck!
Answer:
Br
Explanation:
The ocean both absorbs and releases heat more slowly than land does
True or false.
How can the gravitational potential energy of an object be changed?
Answer:
Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem).
Explanation:
4. Hot material in the Earth's mantle rises and cool material
sinks. This is an example of
a. conduction
b. convection
c. radiation
d. none of these
Answer:
Th answer is b. convection.
Explanation:
As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.
Question 4
Which best describes a chemical reaction that follows the law of conservation of matter?
А
The reactants have the same mass as the products.
B
The reactants have the same density as the products.
С
The products conserve all physical properties of the reactants.
D
The products conserve all chemical properties of the reactants.
Which formula represents a tetrahedral molecule?
LiBr
CO2
H₂
SIF4
um this is kinda weird I am take a guest SIF4
The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
From the question,
We are to determine which of the given formulae represents a tetrahedral molecule
In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.
A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron
Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.
Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
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What does the chemical formula show?
a) The number of elements in each molecule
b) The number of atoms in each molecule
c) How heavy the molecule is.
d) The elements in the molecule and the number of atoms of each one .
Answer:
A
Explanation:
You can eliminate C because you need to consult a periodic table to determine the mass (not the weight).
There are other answers you could use. The wording is awfully sloppy. D is an example of that. The elements part is true, the atoms part is not really true in all cases. For example NaCl is table salt and both the elements are ions, not atoms. Na is plus ion and Cl is minus one. B is wrong for the same reason.
I think in the end I would choose A. I think this is a very sly question. It is not really testing chemistry. It is testing how well you know your definitions.
1+1 = ?
plz say plzplapL
Which of the following is not likely to occur if a city loses its tax base due to economic decline? A. The city will have fewer police and fire fighters. B. City residents will have adequate health care and hospital services. C. The city will have a decline in public housing. D. Public and private buildings will decay.
Answer:
B.
City residents will have adequate health care and hospital services.
Explanation:
the correct answer for edg 2020
Answer:
B
Explanation:
heyyyyyyy......................
Answer:
helllllooooooo hi how is life
Answer:
hiiii
Explanation:
Heyy, I am a 14 year old girl
What is the mass of 0.0467 mol of the element sodium (Na)
Answer:
Explanation:
All periodic tables list different amounts of elemental masses. I'm going to round Sodium to 23
1 mol of sodium = 23
0.0467 mol sodium = x
Cross multiply
1*x = 0.0467 * 23
x = 1.0741 grams
When their is a new moon the sun and moon are on the same side of the earth this leads to a combination of gravitational forces causing usually high tides called
Neap tides
Low tides
Supreme tides
Spring tides
Answer:
Low Tides
Explanation:
Took the test
100%
Why do electronegativity charts often give no values to the group 18 elements?
Answer:
Because they have complete electronic configuration
Explanation:
Group 18 elements are known as the noble or inert gases. The elements in this group are non-reactive because they have complete electronic shell configuration.
Electronegativity is the tendency of an atom to attract electrons. The reason why atoms attracts electrons is to have a stable configuration like those of the noble gases. Since the noble gases do not require any extra-electrons to attain stability, they have 0 electronegative values.PLEASE HELP ME!!!
THE CHEM QUESTION IS...
Calculate the amounts of heat required for 25.0 g of water to change from 10°C to 30°C
Answer:
1045
Answer: 1045 J of energy was released on cooling the down the water from 20 °C to 10 °C.
Answer:
..............=2100
A sample substance has the chemical formula:
H2CO3
One molecule of the sample contains -
Two different elements with atomic numbers 1 and 27
Two different elements with atomic numbers 1, 6, and 8
Two different elements with atomic numbers 2 and 29
Two different elements with atomic numbers 2, 8 and 20
Answer:
1,6,8
Explanation:
Periodic Table- H=1.C=6,O=8
Hydrogen is H, Carbon is C, Oxygen is O
One molecule of the sample contains three different elements with atomic numbers 1,6 and 8.
What is an element?Element 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.Each element has its own characteristic property.
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Your question is incomplete, but most probably your full question was,a sample substance has the chemical formula:
H2CO3
One molecule of the sample contains -
Two different elements with atomic numbers 1 and 27
Two different elements with atomic numbers 1, 6, and 8
Two different elements with atomic numbers 2 and 29
Two different elements with atomic numbers 2, 8 and 20
Three different elements with atomic numbers 1,6 and 8
Four substances are tested for different properties. The results of the tests are in the table below.
Substance
Combustible
Reactivity
Solubility in water
Solubility in ether
Boiling point (ºC)
W
Yes
Yes
Soluble
Insoluble
883
X
Yes
No
Insoluble
Insoluble
2,750
Y
Yes
No
Insoluble
Soluble
196
Z
No
Yes
Soluble
Soluble
98
Which substance is most likely an alkane?
W
X
Y
Z
Answer:
Element Y, or the third option
Explanation:
Alkanes are insoluble in water, but soluble in ether. Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.
Answer:
c.
Explanation:
why do chemical equations have to be equal
Answer:
Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.
Explanation:
YW :)
How does nano frabic work
Answer:
Nano silver is woven into fabric to give it anti-bacterial properties.
Explanation:
Helps by fending off the bacteria that make those clothes smell after you sweat. Nano-titanium dioxide adds sun protection to clothing just as it does in sunscreen. The use of nanoparticles to achieve fresh-smelling clothes and UV protection may not be safe.
How can a mixture be separated?
Answer:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
Help please. ASAP.
1. Explain how you think changing in the thickness or length of the nail will affect the strength of the electromagnet
Answer:
I believe- If there is more metal for the magnet to reach for, then the strength will grow but it may be harder to pick up off of a surface depending on the weight of the nail. If it is a light nail, it would be more efficient for a quick result in having the magnet to pick it up
Explanation:
Answer:
Ferromagnetic materials make the magnet stronger than non-ferromagnetic materials like paper, wood, or air. A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.
Explanation:
I hope this helps!!
Which option is an example of a chemical property?
boiling point
density
color
ability to react with oxygen
Answer:
Boiling point is one of the answers