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elements and compounds
Page 4
Questions (232)
Caffeine is 49.47% carbon, 5.19% H, 28.8%N
and 16.48% O. What is mass of carbon in 37.1g of caffeine?
2 answers
asked by
Connie
568 views
Sodium, Na+1 and chlorine Cl-1 often react together to form a molecule they do this because
sodium gives an electron away
2 answers
asked by
kaiya
541 views
Are the characteristics or properties of the elements making up a compound different from the characteristics
or properties of
2 answers
asked by
anonymous
559 views
sodium is manufactured commercially by electrolysis of molten sodium chloride. explain why it is not possible to use sodium
2 answers
asked by
Anonymous
538 views
H electronegativity: 2.2
• H valence electrons: 1 • C electronegativity: 2.55 • C valence electrons: 4 • O
1 answer
asked anonymously
45 views
what do glass, water, carbon dioxide, plastic wrap, and air have in common
3 answers
asked by
Anonymous
531 views
Nitrogen gas, N2, is usually a very inert gas and thus, is often employed in dry boxes. However, it would be a poor choice for
1 answer
asked by
blobface
540 views
Europium can have a 2+ or a 3+ charge. which one of the following below is not possible
1. EuSO4 2.Eu2(SO4)3 3.EuPO4 4.Eu(NO3)3
4 answers
asked by
SHORNORA
524 views
Can someone please give me an example of a chemical reaction of scandium with oxygen?
Thanks This site may have the information
2 answers
asked by
Lacey
553 views
Please check the following.
1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c.
2 answers
asked by
Anonymous
511 views
In aqueous solution Mg consists as an ion +2 . What would the formula of the metal salt magnesium sulfate be??
I think it will be
4 answers
asked by
Miki
534 views
What is the percentage of sulfur in copper(I) sulfide, Cu2S
2 answers
asked by
Tierney
512 views
what are metals and non metals that are found in the human body and their function?
4 answers
asked by
ANNA
481 views
What is the valency of selenium in hydrogen selenide?
Consider what selenium's group is in the periodic table. There is oxygen
1 answer
asked by
sarah
529 views
Is sand an element or a compound? Please help ASAP!!! :(
2 answers
asked by
Andrea
461 views
iron+sulphur together are a mixture of small grains yellow and dark grey.Its chemical symbol is 'Fe + S'.When it reacts with
2 answers
asked by
jess
494 views
An alloy of iron and silver has a total mass of 30 grams and a volume of 20.4cm^-3.Calculate the mass of iron only and the
1 answer
asked by
Juliet
492 views
What are some things that are in the US that use or need radium to operate?
Radium has very few commercial uses these days, it
1 answer
asked by
Lanna
471 views
lists the properties of copper, sulfur aqnd copper sulfide
1 answer
asked by
nana
440 views
Is sodium isotonic with Mg²+
1 answer
asked by
Raj
443 views
Is pure air an element or a compound? Please help ASAP!!! :(
1 answer
asked by
Andrea
439 views
which of the following has the largest nos of oxygen atom.
1- 1 gm of oxygen atom 2- 1 gm o^2 3- 1 gm of ozone
1 answer
asked by
divyam arora
446 views
How many potassium ions are there in 15g of potassium nitride
1 answer
asked by
Adelaide
420 views
A magnet was placed near a pile that contained both iron and sulfur. The magnet was moved gradually closer to the pile. As it
1 answer
asked by
trippie
52 views
a large amount of potassium in plant food could cause the formation of MgKPO4:6H2O along with MAPH. what would be the effect on
1 answer
asked by
dave
453 views
List at least four places/sources in which carbon is found.
1 answer
asked anonymously
23 views
In compounds, Oxygen has an oxidation number of -2.
true or false
1 answer
asked anonymously
18 views
Free elements such as Al and O2 have an oxidation number of 1.
2. In most compounds, Hydrogen has an oxidation number of +1. : In
1 answer
asked anonymously
43 views
What is the fundamental difference between elements and compounds?
Responses Elements consist of two or more types of atoms,
1 answer
asked by
hheee
37 views
Selenium has an atomic number of 34 and a mass number of 79.
1. What are the number of protons, neutrons, and electrons in a
1 answer
asked by
yoyo808
16 views
In an atom of lithium sulfide there are 2 atoms of lithium and one atom of sulfur which statement about lithium sulfide is
1 answer
asked anonymously
11 views
Paraphrase this so it can pass an AI checker
All elements are pure substances, but not all pure substances are elements. Pure
1 answer
asked anonymously
31 views
The table below lists 4 substances. Two of the listed substances are elements and two of the listed substances are compounds.
1 answer
asked by
rohde
28 views
The table below lists 4 substances. Two of the listed substances are elements and two of the listed substances are compounds.
1 answer
asked anonymously
45 views
The table below lists 4 substances. Two of the listed substances are elements and two of the listed substances are compounds.
1 answer
asked anonymously
28 views
The table below lists 4 substances. Two of the listed substances are elements and two of the listed substances are compounds.
1 answer
asked by
Checking My Answers Only
26 views
Oxidation number of Sulfur in SO3
1 answer
asked anonymously
22 views
The table below lists 4 substances. Two of the listed substances are elements and two of the listed substances are compounds.
1 answer
asked by
the best
93 views
Phosphorous forms bonds and creates molecules based on its ionic charge. What element can it react with to form a stable
1 answer
asked anonymously
25 views
Nitrogen must combine with other elements before producers can use it, ___________
1 answer
asked anonymously
15 views
is table salt element or compound
1 answer
asked anonymously
28 views
Classify each item as an element or a compound. the rust on a titanium beam:
1 answer
asked anonymously
60 views
The chemical formula for aluminum hydroxide is Al(OH)3. Which of the following is true about aluminum hydroxide?
It contains
1 answer
asked anonymously
24 views
Which is a similarity between elements and compounds?%0D%0A%0D%0AAnswer options with 4 options%0D%0AA.%09%0D%0ABoth contain
1 answer
asked by
fellow person of Texas connections academy
27 views
How are elements different from compounds
1 answer
asked anonymously
9 views
How are elements of compounds different
1 answer
asked anonymously
8 views
What form of nitrogen is found in the atmosphere:
1 answer
asked anonymously
15 views
Most minerals on earth’s surface contain which of the following?
Responses nitrogen and oxygen nitrogen and oxygen oxygen and
1 answer
asked by
abigail
34 views
How many atons of each element found in Halite:
Na Cl
1 answer
asked by
Mystery
8 views
A student drew pictures to show the differences between elements and compounds.
Which statement can the student support with her
1 answer
asked by
not.bta.eli
74 views
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Parent Categories (17)
Atomic Mass
Atomic Structure and Bonding
Basic Concepts
Chemical Substances
Chemistry
Chemistry Education
Earth Sciences
Oxidation Numbers
Periodic table
Pure Substances
Science and Chemistry
Science and Technology
Substances
Substances and Mixtures
Types of Matter
Types of Pure Substances
Types of substances