Answer:
295.15 i think
Explanation:
What are the reasons of greenhouse effect?
Answer:
Explanation:
Causes of Greenhouse Effect
Burning of Fossil Fuels. Fossil fuels are an important part of our lives. Deforestation. Plants and trees take in carbon dioxide and release oxygen.Farming.Industrial Waste and Landfills.Global Warming.Depletion of Ozone Layer.Smog and Air Pollution.Acidification of Water Bodies.
Why is ice melting considered to be a PHYSICAL change?
A. the water molecules do not change chemically and are still H2O
B. the water molecules change into new chemicals and are no longer H2O
C. They are chemically mixed and won’t for H2O
D. They will just be the same liquid (already did this and it wasn’t it)
Answer:
A. the water molecules do not change chemically and are still H2O
Explanation:
The arrangement of molecules is the only change that occurs
[tex].[/tex]
Any material that exerts magnetic force is considered a magnet true or false?
Answer:
Any material that exerts magnetic force is considered a magnet.
TRUE
Write the merits and demerits of Mendeleev periodic table in points and explain each of them in short
Answer:
merits of mendeleev periodic table are:
it was first scientific and systamatic study of different element.there were may gaps for in discovered elements.After their discovery the got their proper place in table.with the help of mendeleev periodic table , properties of several elements were studied correctly.demerits of mendeleev periodic table
it could not arrange hydrogen as it shows the property of both alkali and halogens.it could not arrange isotopes because they have different atomic weight but same atomic number.it could not arrange Lanthanides and Actinides.hope these points helped you
need more points then comment it .
what is the pH if H+ = 4.0 times 10 to the power of negative 8
Answer:
[tex]pH = - log[H {}^{ + } ] \\ pH = - log(4.0 \times {10}^{ - 8} ) \\ { \boxed{ \boxed{pH = 7.4}}}[/tex]
Gimme ur bath water plzzzz
Answer:
plzz can you explain in detail this Q
The first person to use the term "atom" was _____.
Aristotle
the Egyptians
Dalton
Democritus
Answer:
The first person to use the term "atom" was Democritus.
Answer:
Democritus
Explanation:
When two atoms of element Y combine, Y2 molecule is formed.
What is the type of bond formed? Fill in the blanks, how it is formed.
(i) The type of bond formed is________ bond.
(ii) A Y atom has______outer electrons.
(iii) It needs____more electron to attain a stable_____electronic
configuration.
(iv) A Y atom shares____of its
____electrons with another Y atom.
Answer:
chemical bond
Explanation:
because this is the only bond used in chemical reactions just like molecules of atoms are combined by this bond
prove that the liquid pressure is directly proportional to the depth of the liquid?
Explanation:
Pressure and depth have a directly proportional relationship. This is due to the greater column of water that pushes down on an object submersed.. so the deeper the liquid level the higher the pressure of the liquid.
What method of measuring volume of these objects would be most accurate and why?
Answer:
where are the object
Explanation:
can you have a look at your question
please help asap....will mark brainliest
a compound is made up of 56.34% oxygen and phosphorus.state the empirical formula and name the compound
Answer:
An interesting way to approach this problem is to determine the oxide's molecular formula first, then backtrack and find its empirical formula.
So, you know that this oxide of phosphorus has a molar mass of
284 g mol
−
1
. This tells you that one mole of this oxide has a mass of
284 g
.
You also know that the oxide has a percent composition of
43.66
%
phosphorus and
56.34%
oxygen.
This means that every
100 g
of oxide will contain
43.66 g
→
phosphorus,
P
56.34 g
→
oxygen,
O
Pick a
284-g
sample of this oxide, which will be equivalent to one mole, and determine how many moles of each constituent element it contains. This will get you the compound's molecular formula.
So, you can say that this sample will contain
284
g oxide
⋅
43.66 g P
100
g oxide
=
123.994 g P
284
g oxide
⋅
56.34 g O
100
g oxide
=
160.006 g O
Use the molar masses of the two elements to convert the masses to moles
For P:
123.994
g
⋅
1 mole P
30.9738
g
=
4.003
≈
4 moles P
For O:
160.006
g
⋅
1 mole O
15.9994
g
=
10.001
≈
10 moles O
Since this is how many moles of phosphorus and oxygen you get in one mole of the oxide, it follows that its molecular formula will be
molecular formula
=
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
P
4
O
10
a
a
∣
∣
−−−−−−−−−−
→
phosphorus pentoxide
To find the empirical formula, all you have to do is rewrite the
4
:
10
mole ratio that exists between the two elements in its smallest whole number form.
In this case, you can say that
4
:
10
⇔
2
:
5
This means that the empirical formula will be
empirical formula
=
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
P
2
O
5
a
a
∣
∣
−−−−−−−−−
compound 1 contains 15.0g of hydrogen and 120.0g oxygen. What is the percent compound of each element?
Note down the formula below
[tex]\boxed{\sf Mass\%\;of\; element=\dfrac{Mass\:of\:the\: element}{Mass\;of\:the\: compound}\times 100}[/tex]
Mass of the compound
[tex]\\ \sf\longmapsto 15+120=135g[/tex]
Mass % of Hydrogen:-
[tex]\\ \sf\longmapsto \dfrac{15}{135}\times 100[/tex]
[tex]\\ \sf\longmapsto \dfrac{1}{9}\times 100[/tex]
[tex]\\ \sf\longmapsto 11.1\%[/tex]
Mass % of Oxygen:-
[tex]\\ \sf\longmapsto \dfrac{120}{135}\times 100[/tex]
[tex]\\ \sf\longmapsto \dfrac{8}{9}\times 100[/tex]
[tex]\\ \sf\longmapsto 88.9\%[/tex]
At the end of an experiment, a scientist ___ or ____ his/her hypothesis.
Supports, proves
Proves, rejects
Supports, rejects
Disproves, proves
True or False:
If a chemical is used in a chemical reaction as a reactant but no
products are formed and nothing changes about the chemical,
it is safe to assume it has no chemical properties.
Answer:
i think true ..........................................
Crystallization is used for separate the mixture?
option
1. sand and water
2. salt and water
3. sand and camphor
4. cream and milk
Please help me to find it out
Answer:
when the solution is heated and reaches its saturation point thus starts forming crystals thus crystals starts forming hence crystallisation takes place
Answer:
salt and water
EXPLANATION:Stir salt into boiling hot water until no more salt will dissolve (crystals start to appear at the bottom of the container). ...
All alkalis are bases but all bases are not alkalis, why ?
Answer:
Bases may either be soluble or insoluble in water, all alkalis are bases because they will all neutralize acids, but not all bases are alkalis because not all bases will dissolve in water.
Explanation:
hope it is helpful for youkeep smiling
Where Would It Fall?
Six friends were talking about asteroids and meteorites that
could fall to the Earth. The friends wondered where an object
from space would most likely fall. This is what they said:
Maya:
“I think it has the greatest chance of landing in
a desert."
Elsa:
"I think it is most apt to land where humans are living."
Walter:
"I think it will most likely land in an ocean."
Mac:
"I think it will probably land on an ice-covered area."
Amber:
"Chances are it will land on the largest continent."
Evan:
"Most likely it will land in a body of freshwater."
Which person do you most agree with? Explain your reasons for where you think a
large object from space would most likely fall
Answer: Walter: On the Ocean
Explanation: Oceans cover 71% of Earth. Chances are 71% it will land with a salty splash.
Convert 355 degrees C to K.
Answer: 628.15 K
Explanation:
Add 273.15 to any temperature in Celsius to get it in kelvin
Identify the statements that are correct. Check all that apply. View Available Hint(s)for Part A The mass ratio of oxygen to carbon in CO is twice the mass ratio of oxygen to carbon in CO2. For two compounds of C and O, the mass ratio of C to O in one compound is a multiple of the mass ratio of C to O in the other compound or can be converted to a small whole number ratio. The mass ratio of oxygen to carbon in CO2 is 2.667 for every sample of CO2. The mass ratio of oxygen to carbon in CO is 1.33 for every sample of CO.
The correct statement is; For two compounds of C and O, the mass ratio of C to O in one compound is a multiple of the mass ratio of C to O in the other compound or can be converted to a small whole number ratio.
According to the law of multiple proportions, if two elements say, A and B combine to form more than one chemical compound; the various masses of one element, A, which combine with a fixed mass of the other element B are in simple ratio.
This means that, if there are two compounds of elements like C and O (as in CO and CO2), the mass ratio of C to O in one compound is a multiple of the mass ratio of C to O in the other compound or can be converted to a small whole number ratio.
Learn more; https://brainly.com/question/11378529
PLZZZZZZZZZZZZZZ HELP FAST
Answer:
Choice 3.
Explanation:
Higher temperature leads to higher avg kinetic energy so you can use POE to eliminate options 2 and 4. Since the temperature increases, the molecules will move faster and that would make less space between particles so you can eliminate choice 1. You wouldn't need to look at the volume choices and know the answer is choice 3.
The speed of sound through air is approximately 343 m/s. What is the speed in
miles per hour? 1 ft = 0.3048 m; 1 mile = 5280 feet
Answer:
343m/s= 767.26...mph
Explanation:
First we convert meters to feet.
343m = 1125.32ft
Next, we convert feet to miles.
1125.32ft = 0.2131288 miles
Finally, we convert 0.2131288 miles per second into mph. Since there's 3600 seconds in an hour, we multiply 0.2131288 by 3600.
0.2131288 x 3600 = 767.26368...
I hope this helps!
I.Molten Nacl conducts electricity due to the presence a
a-free electrons
b. free ions
c. Free molecules .
d. Atoms of sodiium and chloride.
Answer:
Hello! Your answer would be BELOW
Explanation:
So a molten salt powers electricity. Hence, molten sodium chloride conducts electricity due to the presence of free ions. So, the correct answer is option D. Atoms of sodium and chloride.
Hope I helped! Hope you make an 100%
-Amelia♥
A scientist is working in a lab and accidentally combines two liquids that quickly form a solution. Which process could be used to separate the two liquids?
Answer:
Distillation
Explanation:
The method of distillation can be used to separate the two liquids, if their boiling point is known. The liquid with lower boiling point will be evaporated and its vapours will be captured, while the liquid with higher boiling point will remail in the container in the liquid state.
The process that could be used to separate the two liquids is heating the liquids and letting one boil away first. The correct option is A.
What is liquid?The liquid is one of the states of matter. The liquid has molecules that are nearer than gas. The liquid does not have a specific shape and size. They acquire the shape of the container in which they are poured.
When the liquid is boiling and the molecules of the liquid convert into vapor. The molecules of liquid go far away from each other. When the temperature increased, boiling happened. The process will be heating the liquids and letting one boil away first.
Thus, the correct option is A. heating the liquids and letting one boil away first.
To learn more about liquid, refer to the link:
https://brainly.com/question/16650179
#SPJ2
The question is incomplete. Your most probably complete question is given below:
heating the liquids and letting one boil away first
passing the liquids through a filter to collect one of them
collecting one of the liquids with a spoon
waiting for the two liquids to separate
NEED IT ASAP
1) Plants need water for______in order to make food. water is needed more for _____, to maintain body temperature and transport nutrients.
Answer:
Hi Lovelys!!
Answer down below!!
Explanation:
Answer: Plants need water for photosynthesis in order to make food. Water is needed more for cooling, to maintain body temperature and transport nutrients.
Reason: Plants need water for photosynthesis. Water also helps move nutrients from the soil into the plant. Too little water can cause a plant to wilt or droop. Too much water can cause a plant's roots to rot. Plants are about 80-95% water and need water for multiple reasons as they grow including for photosynthesis, for cooling, and to transport minerals and nutrients from the soil and into the plant.
Hope this helps!! =3
Have a wonderful day, evening, or night!!
Your friend's pet hamster weighs 152 grams on Earth. If that hamster traveled to space, what is its weight and why? Answer in complete sentences,
Answer:
force of gravity 1.2 N
Explanation:
dont know for sure but here's what I got
a cheetah has been clocked at 112 km/hr. what is this speed in m/s?
Answer:
31.1111
Explanation:
should be this if not sorry
What conditions might cause a
scientist to modify
or revise a
hypothesis
Answer:
Upon analysis of the results, a hypothesis can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.
Explanation:
Which of these is a
PHYSICAL change?
A.
water freezes
В.
something burns
(Only for that “change” guy nobody else answers it except him)
Answer:
A
Explanation:
The answer is A
this also need to be 20 characters
Answer:
A. water freezes
Explanation:
i wanted to answer sorry
How do electrons in the same atom differ?
Answer:
The central structure of an atom is the nucleus, which contains protons and neutrons. This nucleus is surrounded by electrons. Although these electrons all have the same charge and the same mass, each electron in an atom has a different amount of energy. ... Electrons that have higher energy are found further away.
Explanation:
32. List three examples of substances. Explain why each
is a substance. (3.1)
Answer: Chemical X H3 and f1
Explanation:
