Answer:
The number of energy level increases
Explanation:
Shielding effect increases from top to bottom in a group because the number of energy level increases.
Shielding effect is the process by which electrons in an atom protects one another from the pulling effect of the nucleus.
Down a group, the shielding effect increases due to increased number of electronic shell.
Can somebody plz tell me which one I should circle for each question thanks!!!
(All must be correct)
WILL MARK BRAINLIEST
Grade7science
Answer:
1. False
2. True
3. True
4. True
5. False
Explanation:
Answer:
1. False (All compounds are molecules but not all molecules are compounds)
2. True (elements make up a compound by combining chemically together)
3. True (water is a molecule consisting of 3 atoms and 2 hydrogen that bond together)
4. True (they are made by humans using different nature uses and chemical structures that cannot be found in nature)
5. False (a compound is made up of two or more different atoms that can bond or be broken down into simpler compounds)
Hope this helps:)
Explanation:
A student mixes 250 millimeters of a strong base with 100 millimeters of a strong acid. What will the result be?
- a weak base
— weak acid
- a stronger base
- a stronger acid
Answer:
A stronger base.
Explanation:
In neutralization reactions, when an acid is mixed with a base, both species react to different degrees that depends on the concentrations and volumes of the acid and the base. In this case the student mixes a strong base (250 mL) with a strong acid (100 mL), what will happen is that the substance that is going to predominate (strong base) will be the one that is in greater quantity than the other, so the solution will remain a strong base.
How is energy and gravity related to speed?
Answer:
In classical theories of gravitation, the changes in a gravitational field propagate. A change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces.
Explanation:
A compound is 21.6% Mg, 21.4% C, and 57.0% O. What is the empirical formula of the compound?
Answer:
Compound x = [tex] MgC_{2}O_{4}[/tex]
Explanation:
Let the compound be x
Assuming we have a 100g of compound x
Given the following data;
Magnesium, Mg = 21.6% = 21.6g
Carbon, C = 21.4% = 21.4g
Oxygen, O = 57.0% = 57.0g
Now, we would find the amount of moles for each element.
Atomic mass of Mg = 24.30g
Atomic mass of C = 12.01g
Atomic mass of O = 16.00g
Amount of moles for Mg;
21.6*(1/24.30) = 0.89mol
Amount of moles for C;
21.4*(1/12.01) = 1.78mol
Amount of moles for O;
57.0*(1/16.00) = 3.56mol
We then divide by the smallest to find the ratio;
0.89/0.89 = 1 Mol of Mg
1.78/0.89 = 2 Mol of C
3.56/0.89 = 4 Mol of O
Therefore, the ratio of Mg, C and O is 1:2:4.
Compound x = [tex] MgC_{2}O_{4}[/tex]
Hence, the empirical formula of the compound is [tex] MgC_{2}O_{4}[/tex]
help me out here! please
Answer: The third one 0.750 L
Explanation: 1,000 Millilitres equal 1 Liter
500 + 250 = 750 (Not A Liter)
So 0.750 L
Answer:
0.75L
Explanation:
I guess you know what's the total milliliters he drank right? 750ml
To convert ml to L, you have to know 1000ml is equal to 1L. So all you have to do is to divide the 750 by 1000 which is 0.750ml.
How is the ice different from the water vapor that forms after the water begins to boil?
Answer:
they are different forms of matter
Explanation:
why are lab rules important
Answer:
if we do not have lab rules then something could go wrong like we could die or like what happened right now CORONAVIRUS that is why lab rules are so important to prevent things like this from happening
2) In a calorimetry experiment, 70.0 g of a substance was heated to
270.00 degrees Celsius and then placed in 3500.0 g of water. The water
bath's starting temperature was 15.00 degrees Celsius. If the substance's
listed specific heat is 0.890 J/gC, predict the temperature at thermal
equilibrium. *
onlar
The temperature at thermal equilibrium : 16.1 °C
Further explanationQ absorbed = Q released
Heat can be formulated :
Q = m.c.Δt
c= specific heat, J/g°C
Δt = temperature different, C°
m= mass, g
Q water=Q substance
[tex]\tt 3500\times 4.18\times (t_2-15)=70\times 0.89\times (270-t_2)\\\\14630(t_2-15)=62.3(270-t_2)\\\\14630t_2-219450=16821-62.3t_2\\\\14692.3t_2=236271\\\\t_2=16.1^oC[/tex]
What does the periodic table display
Answer:
chemical elements
Explanation:
I think
Answer:
all of the known elements that exist in the world today.
Explanation:
The Periodic Table
Help? Ill give brainliest if its right :,)
Answer:
17. 10 atoms
18. 21 atoms
Explanation:
17. 2 Phosphurus and 8 Oxygen
18. 6 Sodium, 3 Sulfur, and 12 Oxygen
Can somebody plz answer both questions correct!!! Only answer in 1-2 sentences.. that’s fine :)
(WILL MARK BRAINLIEST) will appreciate it thanks!
Answer:
a chemical change is usually an irreversible chemical reaction. an example of this is rusting.
a physical change is usually visible while a chemical change isn't. also, a chemical change is irreversible while a physical change is.
Explanation:
Please help my teacher is rushing me
the new substances that are created in chemical reactions are called the _________.
Answer:
product
Explanation:
Answer:
products
Explanation:
The elements sodium and chlorine react to form sodium chloride. Does sodium chloride retain any of the characteristic properties of either sodium or chlorine? Explain your answer.
Answer:
No
Explanation:
during chemical change, a new product is formed with entirely different properties with the element.
that's why water does not behave like hydrogen or oxygen but like water.
please mark brainliest
Here, we are required to determine of the Sodium chloride formed from the reaction of sodium and chlorine retain any of the characteristic properties of either sodium or chlorine.
The Sodium chloride formed from the reaction of sodium and Chlorine does not retain any of the characteristic properties of either sodium or chlorine.The reaction between sodium and chlorine to form Sodium chloride is a chemical change.
A Chemical change is one which is characterized by the formation of a new substance upon the reaction between a substance and another, alternatively, chemical decomposition into two or more different substances can also be termed a chemical change. These processes are not reversible except by means of further chemical reactions and the reactants and products have different characteristic properties.Read more:
https://brainly.com/question/18188845
Cell phones are widely used by people all over the world as a medium of communication. When a person makes a call from a cell phone, the cell phone emits electromagnetic waves that are intercepted by a nearby cell phone tower. The cell phone tower then connects the call to the phone of the person being called.
Which of the following processes enables a cell phone to receive communications from a cell phone tower?
A.
Electromagnetic waves from the tower produce an electric current in the cell phone's internal circuit when intercepted by the phone's antenna.
B.
Electromagnetic waves from the tower are reflected by the cell phone, producing an electromagnetic field that is detected by the internal circuits of the phone.
C.
Electromagnetic waves diffract around the cell phone's antenna, which allows the waves to be detected by the internal circuits of the phone.
D.
Electromagnetic waves from the tower interfere with the radio waves emitted by the cell phone, producing electric currents in the internal circuits of the phone.
Answer:
A Electromagnetic waves from the tower produce an electric current in the cell phone's internal circuit when intercepted by the phone's antenna.
Explanation:
Its correct I just did it
The correct option is A which is when a cell phone's antenna picks up electromagnetic waves from a tower, the phone's internal circuit becomes electrically charged through which communication is enabled.
How does a cell phone receive communications from a cell phone tower?Radio waves are sent by mobile phones through a base station network, which is a collection of permanent antennas. Since radiofrequency waves are electromagnetic fields rather than ionising radiation like X-rays or gamma rays, they cannot ionise or destroy chemical bonds in living organisms.
A cell tower has several antennas linked to it, usually positioned on a head frame. Even more than 15 antennas per carrier are found on some towers. This figure largely depends on the performance, area of coverage, and capacity needs of the antenna.
Effect of 5G on health: There are growing worries that the higher intensity radiation from 5G could harm those living close to cell towers. According to theories, the harm done to human DNA by this rise in radiofrequency radiation will result in cancer, premature ageing, and disturbance of cell metabolism.
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3. What is the definition of acceleration?
The change in velocity multiplied by the time of change
The change in speed
The change in velocity
The change in velocity divided by the time during which the change occurs
Answer:
D. The change in velocity divided by the time during which the change occurs.
Explanation: I took the quiz on Accelerate and it was correct
Answer:
D. The change in velocity divided by the time during which the change occurs.
Explanation:
Can somebody plz answer this question only in 1-2 sentences! That would be great thanks so much :)
(WILL MARK BRAINLIEST)
Pure substances are substances which are homogenous in nature. They either consists of atoms of 1 kind or molecules of 1 kind. Atoms are seen in elements, where as molecules are seen in compounds like Acids, Bases, etc.
They mostly have fixed properties like boiling and melting points and are uniform in nature. :D
What do the results tell you about your hypothesis(es)? How do the data support your claim above?
Answer: It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.
Explanation:
Answer:
It tells you if your hyposthesis was incorrect or correct from the data. The data supports this because you tested and got your results correctly which will help you to form a hypothesis.
Explanation: its right trust me
Which would be a biotic factor in an ecosystem?
1)air
2)rain
3)algae
Answer:
3
Explanation:
because biotic are things you can touch
What is the best description of the paths of S waves and P waves? S waves travel through solids or very dense, glassy liquids. P waves travel through solids, liquids, and gasses. S waves travel through solids, liquids, and gasses. P waves travel through solids or very dense, glassy liquids. S waves travel through Earth's interior. P waves travel along the surface of Earth's crust. S waves travel along the surface of Earth's crust. P waves travel through Earth's interior.
Answer: S waves travel through solids or very dense, glassy liquids. P waves travel through solids liquids and gasses
Explanation:
I took the test, hope this helps!!
Name the following Compound: CrF2
Chromium(II) fluoride is the name given to the substance CrF2. In this compound, fluorine (F) is present as fluoride anion while chromium (Cr) is present in +2 oxidation state.
The compound contains two fluoride ions, as indicated by the number prefix "di-" before the element symbol F. An inorganic substance called chromium(II) fluoride crystallizes into a solid. It has a crystal structure that mirrors its atomic arrangement and is composed of fluoride anions and chromium cations. Chromium(II) fluoride is useful in many different industries. It serves as a catalyst in some chemical reactions and as a precursor in the manufacture of other chromium compounds.
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Why is it important to classify living organisms? The DNA of organisms may be more easily analyzed. Organisms may survive longer if they are classified. Scientists may study and discuss organisms more easily. Classifying is needed before scientists may make observations.
Answer:
All living things are organized into groups by scientists as they are identified. Living things organized into particular groups have common characteristics. Overall, the reason scientists classify living things is to understand the relationships between different organisms
Explanation: Naruto
Answer:
C
Explanation:
look at the attachment
I need help 7th grade science
Answer:
a flowing stream
Explanation:
.........
What feature of New York is located about 44°N, 74°W?
Answer:
Adiroak is rhe answere
can u help me pls.
Answer:
its g :)
Explanation:
define equivalent weight of an element
Which has the greater mass, 1 liter of water or I liter of gasoline? The density of water is 1.00 g/mL and that of gasoline is approximately 0.68 g/mL.
Answer:
Water
Explanation:
Gas= 0.689/ml x 1000 ml = 680 g
Water= 1/ml x 1000 ml = 1000 g (grater)
1 liter of water would have greater mass than the I liter of gasoline if the density of water is 1.00 grams/milliliters and that of gasoline is approximately 0.68 grams/milliliters.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
By using the above formula for density
ρ = mass / volume
As given in the problem we have to find which has the greater mass, 1 liter of water or I liter of gasoline if The density of water is 1.00 g/mL and that of gasoline is approximately 0.68 g/mL
1 Litre = 1000 milliliter
1 liter of water = 1000 milliliter
mass of 1 liter of water = density of water ×volume of water
= 1.00 grams/milliliters×1000 milliliter
=1000 grams
Similarly;y for the gasoline ,
1 liter of gasoline = 1000 milliliter
mass of 1 liter of gasoline = density of gasoline ×volume of gasoline
= 0.68 grams/milliliters×1000 milliliter
=680 grams
Thus we calculated that 1 liter of water would have a mass of 1000 grams while the I liter of gasoline has mass of 680 grams.
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How could a synthetic material such as Acegram affect society?
Explanation:
Synthetic fiber or synthetic fibre (in British English; see spelling differences) are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms. They are the result of extensive research by scientists to improve upon naturally occurring animal and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. These are called synthetic or artificial fibers. Synthetic fibers are created by a process known as polymerization, which involves combining monomers to make a long chain or polymer. The word polymer comes from a Greek prefix "poly" which means "many" and suffix "mer" which means "single units". (Note: each single unit of a polymer is called a monomer). There are two types of polymerization: linear polymerization and cross-linked polymerization.
Synthetic material are madeup of monomers and long chain of monomers are known as polymers. The process is known as polymerization and the synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
What is synthetic material?Synthetic materials are microplastic pollution and madeup up of polymers which is a long chain of polymers and the process is known as polymerization.
The synthetic materials are often converts into microplastic that takes a long period of time to decompose and they are also responsible for generation of greenhouse gases.The synthetic material which is popularly known is nylon which is very tough to recycle.
Therefore,synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
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Can you help me with my Science assignment.Please
Answer:
my answer is measuring cylinder
B.Read the problem and answer the question that follow
Annalyn weighs 45.3 kg. Roby is 2.56 kg lighter than Annalyn. Together with Cecille, the three of them weigh 150.09 kg. How much does Cecille weigh?
6.What are the given facts in the problem?
7.Are there hidden questions? What are they?
8.What operations will use to solve the problem?
9.What is the solution yo the problem?
10.How will you check if your answer makes sense?
Answer: See explanation
Explanation:
Annalyn weighs 45.3 kg.
Roby is 2.56 kg lighter than Annalyn. This means that the weight of Roby will be:
= 45.3kg - 2.56kg
= 42.74kg
Together with Cecille, the three of them weigh 150.09 kg. Cecille weight will be:
45.3kg + 42.74kg + Cecille = 150.09kg
88.04kg + Cecille = 150.09kg
Cecille = 150.09kg - 88.04kg
Cecille weight = 62.05kg
To check of my answer is correct, I'll add all their ages together. This will be:
= 45.3kg + 42.74kg + 62.05kg
= 150.09kg
