Answer:
The vertical columns of the periodic table are called groups, or families. The significance is elements with similar properties are placed in the same vertical columns. The horizontal rows of the periodic table are called periods. The significance is that properties vary from left to right along the rows.
Explanation:
We just did this in science
Answer:
columns in the periodic table are reffered to as "periods". periods represent elements with the same number of shells i.e all elements in period 1 have 1 shell (k shell) and vice versa.
What is compost manure? Explain.
Answer:
Compost is a mixture of organic residues (manure, animal carcasses, straw, etc.) that have been piled, mixed and moistened to undergo thermophilic (high heat 113 to 160 degrees Fahrenheit) decomposition (SSSA, 1997).
Explanation:
Regan has an empty glass cup. It has a mass of 0.3 kg. She drops the cup on the ground and it shatters into several pieces. If she collected all of the pieces of the cup, how much mass would all of the pieces have combined?
A.
There is no way to determine the mass of the shattered glass.
B.
more than 0.3 kg
C.
less than 0.3 kg
D.
exactly 0.3 kg
Answer:
743456478697
Explanation:
Answer:
Exactly 0.3 kg
Explanation:
This is the right answer
200mL of 12.0M HNO3 is prepared from stock solution of 16.0M HNO3. A,What volume of stock solution of NH3 is used? And b, What volume of water should be added to the stock
Answer:
a. 150mL of the stock solution was added
b. 50mL of water was added
Explanation:
The solution was diluted from 16.0M to 12.0M, that is:
16.0M / 12.0M = 1.333 times was diluted.
As the volume of the diluted solution is 200mL, the amount of the 16.0M stock solution is:
200mL / 1.333 =
a. 150mL of the stock solution was addedAs the volume of the solution is 200mL and 150mL were added of the stock solution, the volume of water is:
200mL - 150mL =
b. 50mL of water was added2 of 4 examples as to why humans are the most dangerous creatures in the ocean
Answer
We kill animals and we are creul :)
Explanation:
Your welcome
I need a answer quick. PLEASE
What is the volume of 2.43 x 1023 molecules of N2 gas at STP?
does lithium lose or gain valence electrons? and how much?
Aluminum reacts with oxygen to produce aluminum oxide. If I give Tanya 3.2 grams of aluminum, how many g of oxygen does she need??
Al + O2 ---》 Al203
I wrote it out as it was easier to visualise that way, youll need to tap to see the full pic. feel free to comment if u have qns :)
how does air pressure changes with altitude - the distance from the surface
Answer:At higher elevations, there are fewer air molecules above a given surface than a similar surface at lower levels. ... Since more than half of the atmosphere's molecules are located below an altitude of 5.5 km, atmospheric pressure decreases roughly 50% (to around 500 mb) within the lowest 5.5 km.
Explanation:brainliest plz
Answer:
What is that?
Explanation:
Which substance can be decomposed by a chemical change?
A. Sodium, Na
B.Sulfur, s
C. Calcium Chloride, CaCl2
D.Argon, Ar
Answer:
It could be C. Calcuim Chloride.
Explanation:
When you lie down on a mattress the force of ______ pulls your mass towards the floor, while the force of the mattress pushes back up resulting in _______ forces, which allow you to sleep comfortably.
Answer:
1 gravity 2 counteractive
Explanation:
in the food web above which organism has the least amount of energy available?
A. caterpillar
B. Squirrel
C. Fox
D. Shrubs
Why does alcohol evaporate faster than water? *
1.Alcohol evaporates faster than water because alcohol molecules are hotter
2.Alcohol evaporates faster than water because alcohol molecules are not as attracted
to each other as water molecules are
3.Alcohol evaporates faster than water because alcohol molecules are more attracted
to each other than water molecules are (Which one I need help)
Answer:
Number oneExplanation:
Alcohol has a lower boiling point than water. Water boils at 100 degrees Celsius (212 degrees Fahrenheit), while Alcohol boils at 82 degrees Celsius (179.6 degrees Fahrenheit).In a 5.609g of H20, how many molecules H20
arc
present?
Answer:
1.88 x 10²³molecules of H₂O
Explanation:
Given parameters:
Mass of H₂O = 5.609g
Unknown:
Number of molecules of H₂O = ?
Solution:
To solve this problem, we need to find the number of moles of given compound first.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles = [tex]\frac{5.609}{18}[/tex] = 0.31mole
From mole concept;
1 mole of a substance contains 6.02 x 10²³molecules
0.31 mole of H₂O will therefore contain 0.31 x 6.02 x 10²³molecules
= 1.88 x 10²³molecules of H₂O
What has occurred?
an endothermic reaction
an energy formation
a chemical reaction
a precipitate formation
The Statue of Liberty is made out of copper and was once shiny and copper-colored. Over the years, the copper has gone through a process called oxidation, where it has changed into a new material.
Answer:
a chemical reaction
Explanation:
What has happened to the statue of liberty is that a chemical reaction has occurred to the materials making up this edifice.
The statue is made up of copper. On reacting with oxygen, it undergoes an oxidation.
This makes the copper to rust and decolorize.
It implies that copper has reacted with oxygen in air and possibly from water.
This gives a new product.
We know this because for most chemical changes, they give new products and are not easily reversible.
What is the working of fuse ?
Answer:
The interpretation of the frame of reference in question is demonstrated below.
Explanation:
The fuses operate on the assumptions including its heating temperature increase of the power supply. It consists of a single layer strip as well as a tangle of a metal rod or wire with such an, especially non-substance. These were directly linked to the finishes of that same access points. Fuse has always been hooked up to an electrical sequence connection.
Phase of matter found in the sun and stars
Solid
Liquid
Gas
Plasma
Answer:
Your answer is Plasma which is D.
Explanation:
This is because lighting can be structed in the sky near stars or sun.
Can someone help me with the answer because I'm not good with chemistry
show work on how you converted them. (also marking brainliest) <3
explanation for qn:
when converting units, u can show your working in the form
37.5 × 1g/1ml, then convert the g and ml into 1/1000 kg and L, and calculate from there. In the end, u find out its actually a trick qn and 1g/ml = 1 kg/L
Need help urgently!!
If samples of two different elements each represent one mole,
a
heir molar masses are equal.
b
they contain the same number of atoms.
c
they are equal in mass.
d
they have the same atomic mass.
Answer:
it's-D...........................
can yall help w this? iss times so try nd hurry :P
Answer:
The first option
Explanation:
No new compounds were added, and the pre existing ones wern't changed, so option one is the only one that makes sense.
Good luck!
If the height that an object is dropped is increased, the object will bounce higher and therefore have
Answer:
Greater impact
Explanation:
Not only will it have a greater impact, but it will also have a greater risk of permanently deforming since the impact force can overcome the elastic modulus of the material and thus suffer permanent damage.
Foods that are basic can be identified
by what taste?
astr
A. Salty
B. Sour
C. Bitter
D. Sweet
Answer:
sour!
Explanation:
Three common gaseous compounds of nitrogen and oxygen of different elementary composition are known: (A) laughing gas containing 63.65% nitrogen, (B) a colorless gas containing 46.68% nitrogen, and (C) a brown toxic gas containing 30.45% nitrogen. Show how these data illustrate the law of multiple proportions.
Answer:
Please find how these data prove the law of multiple proportions below
Explanation:
The law of multiple proportions was proposed by an English chemist called John Dalton. The law states that when two elements combine and to form more than one compound. The weights/masses of the second element in the two compounds, which combines with a fixed ratio of the first element, is in a simple whole number ratio.
In this question, Nitrogen is said to combine with oxygen to give three different compounds as follows:
A) laughing gas containing 63.65% nitrogen i.e. 0.6365g
This means that the mass of oxygen will be (1-0.6365) = 0.3635g
B) colorless gas containing 46.68% nitrogen i.e. 0.4668g
This means that the mass of oxygen will be 0.5332g
C) brown toxic gas containing 30.45% nitrogen i.e. 0.3045g
This means that the mass of oxygen will be 0.6955g
The ratios of oxygen in the three compounds is therefore:
0.3635: 0.5332: 0.6955
Divide this ratio by the smallest number (0.3635)
0.3635/0.3635 = 1
0.5332/0.3635 = 1.467
0.6955/0.3635 = 1.913
Multiply this ratio by 2, we have:
2: 2.9 : 3.8
Hence, the simple whole number ratio is 2:3:4.
This proves the law of multiple proportions that oxygen is in simple whole number ratio in the three different compounds.
The formula that forms when Magnesium and Permanganate bond
The time it takes the Moon to go from new moon to full moon and back to new moon is about
Answer:
it takes about 29.5 days for the moon to complete a cycle
What volume (in L) of nitrogen monoxide will be
required to produce 54.5 L of carbon dioxide in
the reaction below?
2CO(g) + 2NO(g) → N2(g) + 2CO2(g)
Answer:
54.5 L of nitrogen monoxide, NO.
Explanation:
The balanced equation for the reaction is given below:
2CO + 2NO —> N₂ + 2CO₂
From the balanced equation above,
2 L of NO reacted to produce 2 L of CO₂.
Finally, we shall determine the volume of nitrogen monoxide, NO, required to produce 54.5 L of carbon dioxide, CO₂. This can be obtained as follow:
From the balanced equation above,
2 L of NO reacted to produce 2 L of CO₂.
Therefore, 54.5 L of NO will also react to produce 54.5 L of CO₂.
Thus, 54.5 L of nitrogen monoxide, NO, is needed for the reaction.
Answer:
54.5
Explanation:
Question 11 (5 points)
The following equation is balanced correctly:
Li + 02 --> Li20
O True
False
Answer:
False
Explanation:
On the left side of the equation (Li + O2), there is 1 Li atom and 2 O atoms.
but on thw right side of the equation (Li2O,) there is 2 Li atoms and 1 O atom
If a person is sterile, he or she is:
unable to reproduce
unable to complete meiosis
unable to complete a Punnett square
unable to complete mitosis
Answer:
1
Explanation:
Sterile means sperm or eggs are not able to Technichaly Create or produce.
Dis fo chem try n answer it ig.
atomic weight of nitrogen,aluminium and calcium
Answer:
Atomic weight of(N) nitrogen is 14.0067
(Al)Aluminium is 26.98154
(Ca) calcium is 40.48
Explanation:
I hope it's helpful!
