Chemistry High School

Which of the following pairs of elements belong to the same period?

Answers

Answer 1

Answer:

He and Ar

Explanation:

Related Questions

Solids are usually: equal in density to other phases more dense than liquids less dense than gases

Answers

Answer:

more dense than liquids

Explanation:

i must be present in a compound for it considered organic

Answers

Answer:

Carbon

Explanation:

Organic compounds must contain carbon. They also usually contain hydrogen, oxygen, and often nitrogen and other compounds such as phosphorus.

Nearly all organic compounds contain carbon-hydrogen bonds.

A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the student's percent error? Identify the element. What is the boiling of this element in Celsius degree

Answers

Answer:

Explanation:

percentage error = error x 100 / correct value

= (2.73 - 2.70) x100 / 2.70

= 1.11 %

The element is Aluminium whose density is 2.702 grams / cc

Boiling point of Aluminium = 2519⁰C .

Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K

Answers

16) 100- 273= -173°celsius

17) -73°Celsius

18) °Celsius

19) 77°Celsius

Hi :)

16) 100°K= 100K − 273.15 = -173.1°C

17) 200°K= 200K − 273.15 = -73.15°C

18) 273°K= 273K − 273.15 = -0.15°C

19) 350°K= 350K − 273.15 = 76.85°C

Hope this helps :)

How many days does the waxing and waning phase of the moon last on average? *

Answers

Answer:

7.38 days.

Explanation:

Science investigation skills

Answers

People conduct scientific investigations by formulating a hypothesis and observing the results. They then draw conclusions from those results and then share those conclusions with the larger scientific community.

WILL GIVE 5 STAR RATING AND BRAINLIEST IF YOU ANSWER FIRST AND CORRECTLY

What are the total number of elements in C₄H₉OH ?

Answers

Theres three elements i'm assuming. C (carbon), H (hydrogen), O is Oxygen.

2. Which atom is larger, Na or Al? Explain why.

Answers

Answer:

Explanation:

Because it has the highest protons and electrons(Atomic mass)

Pleaseee help it’s timed!!

Answers

Answer:

voliiviloou

Explanation:

volaiviolu

Answer:

Rows

Explanation:

help quick please?????

Answers

Answer:

the core

Explanation:

Answer:

3rd option, the core.

Explanation:

Plz help!

Covalent bonding is referred to as “sharing” electrons. Is it really sharing? Why or why not?

Answers

Answer:

yes

Explanation:

because they will bond in order to gain more stability which is gained by forming a full electron shell

A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.

Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance

Answers

Answer:

C, Mixture

Explanation:

Answer:

the correct answer is actually D pure substance

Explanation:

The __________________ in a chemical formula tells you how many atoms you have of a particular element.
chemical symbols
arrow
subscript
coefficient

Answers

I believe the answer is subscript

NEED HELP FAST!!!!
Points A and B are locations on the banks of a river. What are the dominant processes occurring at locations A and B? *

A. deposition at location A; erosion at location B

B. erosion at location A; deposition at location B

C. deposition at both locations A and B

D. Erosion at both locations A and B

Answers

Answer:

Explanation:

This chart shows characteristics of three different types of atoms.

A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?

Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.

Answers

Answer is Atom X will accept electrons from Atom Y.

Atom X will accept electrons from Atom Y.

What is Chart?

The official 511 traveller information service for Maryland is CHART Web. Maryland 511 gives drivers dependable, up-to-date information about traffic, road closures, and weather-related traffic events and conditions.

When driving in Maryland, MD 511 assists drivers in getting to their destination in the safest and most effective way possible.

The term "chart" (sometimes referred to as "graph") refers to a graphical representation of data visualization in which "the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart".

Therefore, Atom X will accept electrons from Atom Y.

To learn more about chart, refer to the link:

https://brainly.com/question/15507084

#SPJ7

A mixture that is uniformly mixed is called __. a homogeneous b heterogeneous c suspension d colloid

Answers

Answer:

a. homogenous

Answer: A. homogeneous

Explanation: A mixture that is uniformly mixed is called homogeneous.

Plz mark brainliest:)

Look for other families of ions in the table that follow a pattern similar to that of the polyatomic chlorine ions. Then complete the statement to describe what you find. Select the correct answer from each drop-down menu. Families of ions that contain hydrogen pattern similar to that of the polyatomic chlorine ions. then complete the statement to describe what you find

Answers

Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.

Explanation: Plato

Answer:

Answer: Families of ions that contain NITROGEN, SULFUR, and CARBON follow a pattern similar to that of the polyatomic chlorine ions.

Explanation: Plato

which process do ribosomes perform

Answers

Synthesizes (makes) proteins to be used by the cell. Not membrane bound

A hiker tries to prepare a hard-boiled egg on the high slopes of Mount Everest. The base camp is located 5,300 meters above sea level. The hiker observes that the water begins to boil at 82⁰C, much lower than the 100⁰C needed to cook the raw egg. He hopes that just leaving the egg in the boiling water longer will let the egg cook. Will he have hard-boiled eggs for breakfast?

Answers

Answer:

He will not have hard-boiled eggs for breakfast

Explanation:

The given parameters are;

The elevation at which the base camp of the hiker is located = 5,300 meters

The boiling point of water at the elevation of the base camp = 82°C

The temperature required to cook the raw egg = 100°C

Therefore, we have;

The temperature of the boiling water at the given elevation of the base camp 82°C < The temperature required to cook the raw egg 100°C

Therefore, the eggs will not be hard boiled.

The hiker won't have hard-boiled eggs for breakfast as a result of the

boiling point of water being less than 100⁰C.

The boiling point decreases with an increase in altitude. The hiker was at

5,300 meters above sea level which made the boiling point of water to be

decreased to 82⁰C.

Since the water isn't able to achieve the boiling point of 100⁰C, then the raw

egg won't be hard boiled for breakfast.

Read more on https://brainly.com/question/25725550

3.Zinc has an atomic number of 30 and a mass number of 65, how many neutrons does it have?
30
65
35
95

Answers

So your answer is 35 right okay so you subtract the mass number and the atomic number and that should always give you the neutrons

Answer:

Explanation:

Given parameters:

Atomic number of zinc = 30

Mass number of zinc = 65

Unknown

Number of neutrons = ?

Solution:

The mass number of an atom is the sum of its protons and neutrons;

Mass number = Protons + neutrons

Atomic number is the number of protons in an atom;

Atomic number = Protons

So;

Mass number = Atomic number + Neutrons

Neutrons = Mass number - Atomic number

Neutrons = 65 - 30 = 35

The number of neutrons in the atom is 35

Answers

Atom X will accept electrons from Atom Y.

Answer:

B) Atom X will accept electrons from Atom Y.

Explanation:

because X has 6 electrons and Y has 2 it would make sense for Y to give to X

Bonus question #2: Unknown element, Element X, exists in nature as two isotopes:
^{351}
351

X has a mass of 350.9196 u and
^{353}
353

X has a mass of 352.9209 u. The average atomic mass of Element X is 351.96 u. Calculate the relative abundance of the two Element X isotopes.

Answers

Answer:

Explanation:

your answer is 351.96 i not a 100 per sent right but that should be it

If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day? winks/day.

Answers

Answer:4,800

Explanation:

5 winks a minute, 60 minutes in an hour.

300 winks an hour, 16 hours a day.

4,800.

Answer:

The answer is 4,800 winks per day.

Explanation: There are 24 hours in a day, 24 minus the 8 hours shes asleep is 16. There are 60 minutes in an hour. 5 x 60 is 300. 300 winks an hour multiplied by the 16 hours she's awake is 4,800.

what are twoparts of an atom

Answers

The answer is neutrons and protons.

Hope you got it!!

Which molecule is the most polarizable?
N₂
O2
CH4
CO2

Answers

Answer:

CO2 I was wrong about methane

name two units for density? I need help!!!!

Answers

Answer:

Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth ’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in MKS or SI units). For example, the density of air is 1.2 kilograms per cubic metre.

Explanation:

Is 5O2 a Element or Compound?

Answers

5o2 is a Compound not an element

Which of these elements has an electron configuration of [Kr]5s2?
barium

calcium

rubidium

strontium

Answers

Strontium has an electron configuration of [Kr]5s²

Further explanation

In an atom there are levels of energy in the shell and sub shell

This energy level is expressed in the form of electron configurations.

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is

s: 2 electrons

p: 6 electrons

d: 10 electrons and

f: 14 electrons

From an electron configuration of [Kr]5s² can be concluded :

element is in period 5 (5 = shell)element is group 2(valence electron =2 and block s) has atomic number 38 (Kr = 36 + 2(valence elektron from 5s²)

If we look at the periodic system, the elements that meet the requirements in question are Strontium (Sr)

Answer:

D) strontium

compare and contrast gymnosperms and angiosperms

Answers

(JSYK: this is technically biology)

Anyways, a gymnosperm is a plant (usually a tree) that has unprotected seeds, this means it bears no fruits and can include (but are not limited to) connifers, cycads, and the ginko. Angiosperms produce flowers to help fertilization and have protected seeds. They are also likely to produce fruits or vegetables.

Hope this helps, if not, comment down below please!!!

How many inches are in 4 yards? ( 1 yard = 3 ft and 1 ft = 12 inches)

Answers

Answer:

There are 144 inches in 4 yards.

Hope this helps :)

Explanation:

Answer: 144

Explanation:

Other Questions

Which type of line of symmetry does the figure have? After three plays in which a football team lost 7 yd, gained 3 yd, andlost 1 yd, respectively, the ball was placed on the teams own 30-yd line.Where was the ball before the three plays? How did the weapons used by the frontiersmen in the patriot army give them an advantage over the well trained british army? Which scientist most likely studied tadpole cells under a microscope? Schwann Janssen Hooke Schleiden Alone, and lost in thought, the desert gladeMeasuring I roam with lingring steps and slow;And still a watchful glance around me throw,Anxious to shun the print of human tread:No other means I find, no surer aidFrom the worlds prying eye to hide my woe:So well my wild disorderd gestures show,And lovelorn looks, the fire within me bred,That well I deem each mountain, wood and plain,And river knows, what I from man conceal,What dreary hues my lifes fond prospects dim.Yet whateer wild or savage paths Ive taen,Whereer I wander, love attends me still,Soft whispring to my soul, and I to him.What is the question or problem posed in the sonnet The speaker is lost and wandering around the wilderness.The speaker feels isolated and alone. Im pretty sure its THE SPEAKER FEELS ISOLATED AND ALONE. Passive transport into cells is driven by a concentration gradient; a greater concentration of molecules on one side of the membrane.Which direction would oxygen move across a cell membrane if there was a greater concentration of oxygen molecules on the inside of themembrane?A. It would continue to concentrate inside the cell.B. The random diffusion of oxygen would balance and have no net effect.C. Towards the outside of the cell.D. None of the above. Jose owes his brother $50. He promises to pay his brother back $5 each week until his debt is paid off. Represent the relationship between the debt, D, and the number of weeks, n, in a table, graph, verbal description, and algebraic expression. 1. In paragraph 1 of"The SettingSun and the Rolling World, theword sunblasted is used todescribe the land. How does thisword help you understand whatit is like for Old Musoni to farmhis land? does 9.03 + 10.71 6.8 =13.94 Select the correct answer.One pound of body fat is equal to how many calorles?OA. 500OB. 1,000OC. 2,000OD. 3,500 A cheetah can run at a maximum speed91 km/h and a gazelle can run at a maximum speed of 72.7 km/h.If both animals are running at full speed,with the gazelle 87.5 m ahead, how long beforethe cheetah catches its prey?Answer in units of s. Which is the best estimate of the product of 0.39 x 0.49?00.250.51Answer fast!! :c Analyze this excerpt: Respond and write a reflection in the box below:What, to the American slave, is your 4th of July? I answer; a day thatreveals to him, more than all other days in the year, the gross injusticeand cruelty to which he is the constant victim. To him, your celebrationis a sham; your boasted liberty, an unholy license; your nationalgreatness, swelling vanity; your sounds of rejoicing are empty andheartless; your denunciation of tyrants, brass fronted impudence; yourshouts of liberty and equality, hollow mockery; your prayers and hymns,your sermons and thanksgivings, with all your religious parade andsolemnity, are, to Him, mere bombast, fraud, deception, impiety, andhypocrisy a thin veil to cover up crimes which would disgrace anation of savages. There is not a nation on the earth guilty of practicesmore shocking and bloody than are the people of the United States, atthis very hour. i need 5 examples ..... HELP PLS! WILL REWARD BRAINLIEST, TYSM ! g Jefferson & Sons purchase $5,000 of merchandise from the Claremont Company with terms of 3/10, n/30. How much discount is Jefferson & Sons entitled to take if it pays within the allowed discount period of 10 days Quartzite is a coarse-grained rock derived from sandstone.Which type of rock is quartzite?metamorphicextrusivesedimentaryigneous The point (5, -6) is reflected over the x-axis. What are the new coordinates of the reflection? Find the unit rate. Round to the nearest hundredth, if necessary.$1.99 for 12 lbThe unit rate is $ Part A: which of the following identifies the authors main claim in the text?