Please someone help WHATS the answer

Please Someone Help WHATS The Answer

Answers

Answer 1
the average atomic mass: 40.078 u
electron configuration is the long list underneath the name "calcium" on the element. it starts with 1s^2s^2

Related Questions

what are the uses of the periodic table​

Answers

Answer:

In today's world, the periodic table is very valuable for both students and scientists since it allows them to forecast the sorts of chemical reactions in which a specific element is likely to engage. Rather than memorizing facts and figures for each element, students and scientists can learn a great deal by simply looking at the table. They can learn about an element's reactivity, whether it is likely to conduct electricity, whether it is hard or soft, and many other characteristics by simply looking at the table.

Groups are made up of elements that are in the same column as one another and have attributes that are comparable to one another. If we look at the first column (the alkali metals), for example, we see that they are all metals that have a 1+ charge in reactions, react quickly with water and combine easily with nonmetals.

Periods are made up of elements that are arranged in a row next to one another and have the same maximum unexcited electron energy level as one another.

The periodic table also has the advantage of providing all the information you need to balance chemical processes at a glance, which is a very valuable feature. The atomic number and, in most cases, the atomic weight of each element are included in the table. The group of an element indicates the characteristic charge of that element.

Explanation:

How could you break down the compound calcium carbonate into the elements that make it up ?
A. by melting
B. by crushing
C. with filter
D. with chemical changes

Answers

Answer:

A. By melting

Explanation:

You can break it down by thermal decomposition which is basically melting it and thats because many metal carbonates can take part in thermal decomposition reactions.

Solve the following problems to determine the empirical formula. Show the complete
factors to calculate number of moles, then the molar ration and finally the empirical formula.
1. Calcium bromide is a compound used in photography and the manufactur of fire extinguishing
materials. Analysis of a 20.00 gram sample of calcium bromide yields 4,02 grams of calcium and
15.95 grams of bromine. Calculate the number of moles of both calcium and bromide, then
determine the mole ratio to write an empirical formula for calcium bromide,

Answers

The empirical formula of the compound (calcium bromide) is CaBr₂

From the question given above, the following data were obtained:

Ca = 4.02 g

Br = 15.95 g

Empirical formula =?

Divide by their molar mass to obtain their mole

Ca = 4.02 / 40 = 0.1005 mole

Br = 15.95 / 80 = 0.199 mole

Divide by the smallest to obtain the mole ratio

Ca = 0.1005 / 0.1005 = 1

Br = 0.199 / 0.1005 = 2

Therefore, the empirical formula of calcium bromide is CaBr₂

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rutherford and JJ thompson both contributed to what we know about the structure of the atom. What experiments did they perform and how did it change what we know about the structure of the atom? Furthermore describe the structure of an atom using only two words

Answers

Answer:

J.J. Thomson's experiments with cathode-ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Rutherford's gold foil experiment showed that the atom is mostly empty space with a tiny, dense, positively-charged nucleus. I would describe the structure of an atom as the plum pudding model.

What happens to the molecules that make up a chocolate chip as it is heated in the oven?​

Answers

Answer:As thermal energy is transferred to the chocolate, its molecules vibrate faster and faster. Eventually they vibrate fast enough that they start to slide past each other and move around. As this happens, the chocolate changes from a solid to a liquid.

Explanation:

Answer:

it becomes

Explanation:

as a soggy liquid

that is how it becomes

liquid and little thick

as it is heated

hope it helps you

thank you

Why does sugar taste sweet
PLEASE EXPLAIN

Answers

Answer:

Because i comes from cane.

Una pieza cúbica de 34 mm de arista tiene una masa de 310,5 g. Determina su densidad, expresada en kg/m3

Answers

Answer:

     

Explanation:

   

no Español



si tal vez pudieras traducirlo



Ammonium nitrate criss cross formula

Answers

Answer:

By using the criss cross method,the -1 charge of nitrate ion is shifted to ammonium ion and +1 charge of ammonium ion is shifted to nitrate ion. In this way, the final formula NH4NO3 is formed for the ammonium nitrate.

Write a balanced chemical equation for the standard formation reaction of gaseous hydrogen bromide (hbr)

Answers

[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow HBr[/tex]

Balanced equation

[tex]\\ \sf\longmapsto H_2+Br_2\longrightarrow 2HBr[/tex]

On reactant side:-

H=2Br=2

On products side

H=2Br=2

The balanced chemical equation for the synthesis of hydrogen bromide is [tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex].

What is a balanced chemical equation?

The balanced chemical equation has been given as the reaction in which the number of atoms for each element on the product and the reactant side is equal.

The HBr has been formed with the reaction of the hydrogen and the bromine. The balanced chemical equation for the reaction has been:

[tex]\rm H_2\;+\;Br_2\;\rightarrow\;2\;HBr[/tex]

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What are the consequences of increased nitrogen and phosphorus into water systems? (Site 3).

Answers

Answer:

But when there is too much phosphorus and nitrogen into water systems, it can speed up the process of eutrophication ( increase in the concentration of minerals and nutrients, which enhances the growth of algae, which causes algal blooms). Due to this, dissolved oxygen level is declined as not enough light penetrates in the water body.

Explanation:

How much mass does 1 mol of O2 gas have?

Answers

Answer: 15.99 x2g

Explanation:

A student graphed the position of a cart during a 7-second time interval.
Which statement best describes the cart?

A.
The cart was stationary except for a short burst of acceleration of 0.5 m/s².

B.
The cart accelerated at a constant rate of approximately 0.8 m/s².

C.
The cart was stationary with a velocity of 0 m/s for the entire 7 seconds.

D.
The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.

Answers

Hi!
Answer: D the cart moved at a constant velocity of 0.5m/s for the entire 7 seconds.

The cart accelerated at a constant rate of approximately 0.8 m/s². Option (B) is correct.

Option B is the best description based on the graphed position data during the 7-second time interval. The cart's acceleration can be determined by analyzing the shape of the position-time graph.

If the cart was stationary, the position-time graph would be a horizontal line (option C). If the cart moved at a constant velocity, the graph would be a straight line inclined at a constant angle (option D).

However, the graph likely shows a curved line, indicating changing position over time. This suggests that the cart experienced acceleration. To further confirm, calculate the acceleration:

Acceleration (a) = Δv / Δt,

where Δv is the change in velocity and Δt is the change in time.

Given the time interval is 7 seconds, and the initial and final velocities are likely different, you can calculate the average acceleration. If the average acceleration is approximately 0.8 m/s², then option B is correct.

The graphed data aligns with the scenario of constant acceleration, supporting option B.

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The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.

Answers

Answer:

bacteria

Explanation:

The pathogen below is a single-celled organism without a nucleus that can cause illness in a humans.

examples of physical properties.

Answers

Answer: Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed.

Explanation:

Can you use volume alone to predict whether an object will sink or float? Explain your answer

Answers

Answer:

Can volume alone be used to predict whether an object will sink or float? -No, you need both mass and volume to find its density to see if it can float.

Part B
Emmerson pours the clear water into the side of the vase with the soil and gravel. The series of animated pictures shows how his model looked over time. What do you observe?

Answers

Answer:

experiment can show the movement of pollutants through the groundwater!

Explanation:

Answer:

I see that the water is starting to get darker and darker which means it is getting dirtier the higher is goes up.  So that means that the soil and gravel will pollute the water with dirt, gravel, etc.

Explanation: Please give brainliest have a good day:)

what is the molecular formula of linoleic acid?

Answers

Answer:

C18H32O2

Explanation:

This is it, i hope it helps Good luck.

What mass of silver can be plated onto an object in 33. 5 minutes at 8. 70 A of current? Ag (aq) e- → Ag(s).

Answers

Answer:

need points sorry

Explanation:

Fe(s) + CuSO4(aq) —> FeSO4(aq) + Cu(s)

This chemical equation represents a __ reaction.

A. synthesis
B. decomposition
C. neutralization
D. single replacement

Answers

Answer:

D

Explanation:

single replacement....iron combined with tetraoxosulphate (VI)

what is the unique characterization of a ph buffer?

Answers

it has a definite pH value

Phân tử khối của CO² gấp mấy lần phân tử khối khí H²

Answers

Explanation:

DCO2/H2 = 44/2 = 22............................

Two students, Janelle and Corey, are ready to test their designs.

Janelle made her solar oven by lining a piece of poster board with aluminum foil, shaping it into a cone, and placing it over a piece of black paper in an empty box. The food will go in a plastic sandwich bag on top of the black paper in the center of the cone. The image shows Janelle's cone oven.

cone shaped solar oven
Corey made his solar oven by lining the inside of a shoe box with black paper, placing a piece of plastic wrap over the bottom of the shoe box, and lining the lid of the box with aluminum foil. He used a pencil to prop the lid open at an angle. The food will go on the black paper under the plastic wrap. The image shows Corey's shoe box oven.

shoe box solar oven
Janelle's and Corey's designs both use aluminum foil, black paper, and either a plastic bag or plastic wrap. What is the purpose of each of these materials in the designs?

Answers

Anwser

my anwser is both will absorb and the will retain

Janelle made her solar oven by lining a piece of poster board with aluminum foil, shaping it into a cone, and placing it over a piece of black paper in an empty box. The food will go in a plastic sandwich bag on top of the black paper in the center of the cone. The image shows Janelle's cone oven.

cone shaped solar oven

Corey made his solar oven by lining the inside of a shoe box with black paper, placing a piece of plastic wrap over the bottom of the shoe box, and lining the lid of the box with aluminum foil. He used a pencil to prop the lid open at an angle. The food will go on the black paper under the plastic wrap. The image shows Corey's shoe box oven.

shoe box solar oven

Janelle's and Corey's designs both use aluminum foil, black paper, and either a plastic bag or plastic wrap so that means that they both absorb and they will retain and is u ever do it do not put it under a shave

I NEED HELP
so is for example
FeO + H2O ---> Fe(OH)2
And
Fe + 2H20 ---> Fe(OH)2 + H2
The same? Same thing for other metals

Answers

Answer:

no

Explanation:

because when is iron oxide + water given you iron hydroxide while the other one is Iron plus 2 moles of water giving you iron hydroxide and hydrogen

The minimum collision energy between two molecules in order for them to react is called A activation energy. B dispersal energy C spontaneous energy D transition energy.​

Answers

A: activation energy

hope i helped :D

48. Categorize each of the elements in problem 47 as a
representative element or a transition metal

Will give brainliest :)

Answers

Answer:

The correct answer is a transition metal.

Explanation:

Hope it helps.

Comments:

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All the given elements are representative elements as they have valence electrons present in p -orbital except option a which has valence electron d-orbital and hence is not a representative 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.

Thus, all the given elements are representative elements as they have valence electrons present in p -orbital except option a which has valence electron d-orbital and hence is not a representative element.

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Which surface has the least amount of friction?
An ice rink
A grassy field
A paved road
A sidewalk

Answers

Answer:

An ice rink has the least amount of friction.

Any smooth surface has the least amount of friction.

I hope this helped at all.

Which surface has the least amount of friction?

An ice rink

A grassy field

A paved road

A sidewalk

Answer:

An Ice rink

why do we use acid during the detection of halogens​

Answers

Answer:

Nitric acid decomposes sodium cyanide and sodium halide. else, they precipitate in test and misguide the result. Therefore, dilute nitric acid is added before testing halogens to expel all the gases if evolved.

Step 2: Predict the Number of Nuclei at Each Half-Life
0.5"
Using the values from Step 1, predict the pattern
for the decay of 100 atoms over the course of eight
half-life cycles, Round to the nearest whole
number of atoms. Record in the appropriate
blanks
Time- Half-
Life Cycles, no
Initial
Radioactive Atoms
(Predicted)
100
1
1
0.5
А
2
0.25
A= 27
25
3
0.125
B
B = 16
4.
0.0625
6
C = 9
5
0.03125
С
D=4
6
0.015625
D
7
0.0078125
1
E
8
0.00390625
E
DONE
) Intro

Answers

Answer:

A=50

B=13

C=3

D=2

E=0

Explanation:

How does energy move through a wave? 3 evidence and reasons supporting you answer.

Answers

Sound, energy and radio travel in waves

Having studied the data for patterns and trends, you should now be able to draw
some conclusions about how knowing the half-life of the element Lokium would
help you determine the absolute age of rock in which this element is found. In a
paragraph, create an imaginary example of finding a given amount of Lokium and
DOL in a rock, and then determining the absolute age of that rock. Assume that
each trial represents 1,000 years

Answers

Answer:

The situation given here is imaginary such that the life of Rock has to be found using the half-life of the element lokium that has been found inside the rock.

Half-life of any material is the amount of time taken by that particular material to decay. Now the amount of lokium found in rock can show after how many half-lives this amount has been left out.

The time elapsed will be log (L) atoms X half-life.

Explanation:

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