Answer:
Because they all have different characteristics and they are not just things that the scientists say. they are all different but some of them have the Same charateristics
true or false ?
an insoluble base will react with an acid.
Answer:
true maybe
Explanation:
#CarryOnLearning
Lead (IV) oxide
With ionic and polyatomic compounds
Answer: [tex]PbO_2[/tex]
Explanation:
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here element lead is having an oxidation state of +4 called as [tex]Pb^{4+}[/tex] cation and [tex]O^{2-}[/tex] is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]PbO_2[/tex]
Find the density of this unknown material Mass: 45 g
Answer:
Does it question provide the volume? To find density you need to divide the mass by the volume (d=m/v).
Explanation:
3. Starch is classified as a
A. disaccharide.
B. polypeptide
C. nucleotide.
D. polysaccharide.
Answer:
D
Explanation:
Polysaccharides are long chains of monosaccharides linked by glycosidic bonds. Three important polysaccharides, starch, glycogen, and cellulose, are composed of glucose. Starch and glycogen serve as short-term energy stores in plants and animals, respectively. The glucose monomers are linked by α glycosidic bonds.
Starch is classified as a option D. polysaccharide. Polysaccharides are complex carbohydrates composed of long chains of monosaccharide units, which are simple sugar molecules.
What is StarchStarch is a type of carbohydrate that is made up of many smaller sugar molecules.
It is made up of many smaller sugar units called glucose molecules that are attached together. Starch is a way for plants to store energy. It can be found in seeds, tubers, and other parts of plants. It is an important part of what we eat, especially in foods like potatoes, rice, and grains.
Hence option d is correct.
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0.236 gm of Metal X reacts with O2 forming 0.436 of the compound X2O3 what is the gram atomic mass of x?
there's a atom with atomic number of 9. it has 8 neutrons.what is the number of protons
Explanation:
proton normally = atomic number
protons = 9
What is the type of reaction for the following: Silver nitrate + aluminum
What do solar panels convert radiant energy into?
Answer:
*Solar cells or panels convert radiant energy from the sun into electricity.
Explanation:
why don't birds get electrocuted when they stand on the light post wire
Answer:
Because they have scaled feet
Answer:
Because they have scaled feet that prevents them from getting electrocuted
Below is a diagram of an atom. What is the atomic number of this atom?
Answer:
14
Explanation:
there are 14 electrons in the shells
We have seasons because
Answer:
Earth's axis is tilted at an angle of about 23.4 degrees and different parts of Earth receive more solar energy than others. Earth's orbit around the Sun is elliptical. Because of Earth's axial tilt (obliquity), our planet orbits the Sun on a slant which means different areas of Earth point toward or away from the Sun at different times of the year.
Explanation:
Which statement best describes the main benefit to organisms that reproduce sexually?
O A. They will live longer and reproduce more.
o
B. They will conserve energy during reproduction.
O
C. They will produce a greater number of offspring.
OD. They will produce offspring that have greater genetic diversity.
Answer:
B. They will conserve energy during reproduction
Explanation:
Answer:
b
Explanation:
Pls help 2 parts science
A state of matter in which material has no definite shape but has a definite volume
Answer:
Liquid
Have a goodnight/day and stay safe
which planet has a windstorm that has lasted 300 years?
Answer:
planet Jupiter
Explanation:
The giant storm has persisted in Jupiter's atmosphere ever since astronomers were first able to observe it after the invention of the telescope, more than 300 years ago.
Can someone help me
Answer:
The fourth answer choice.
Explanation:
This is the correct answer because dropping it, carrying it, won't to anything to change the physical state of the matter (the bowl).
Hope this helps! :)
Protons-29
Neutrons
35
electrons-29
Atomic Mass-64
Answer:
atomic mass=Protons+Neutrons=29+35=64
Explanation:
please complete question.
Which of the following could describe the velocity of a rocket?
A)8,000 m/s2 south
B)8,000 m/s north
C)8,000 m2/s2 east
D)8,000 m/s
Can someone please help me♀️
Answer:
D) 8,000 m/s
Explanation:
Which equation Best obeys the law of conservation of mass?
a) N2 + 3H2 —> 2NH3
b) H2 + O2 —> 2H20
c) 2Ag20 —> Ag2 + O2
d) N2 + H2 —> NH3
Answer:
N₂ + 3H₂ → 2NH₃
Explanation:
To obey the law of conservation of mass, the number of atoms on both sides of the expression, must be the same.
According to the law of conservation of mass "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another".
To express this in chemical reaction, the number of atoms must be the same in going from reactants to products.
N₂ + 3H₂ → 2NH₃
We have 2 atoms of Nitrogen on both sides of the expression.
Also, we have 6 atoms of hydrogen on both sides.
4. How do chemical processes result in thermal energy being released or absorbed? explain
Answer:
there's no answer :)
Explanation:
When chemical bonds are formed, heat is released, and when chemical bonds are broken, heat is absorbed
Identify how many grams are there in 3.5 moles of carbon atoms
Answer:
3.5 moles of carbon = 42.03745 grams
stars have a larger gravitational force then planets
Answer: Is this a true or false question? if it is I believe the answer is True
Explanation:
This is a true statement. Objects with more mass have a larger gravitational force, and stars have many, many times more mass than planets.
Of the first 103 elements, how many have 2 letters in their symbols?
Answer:
90
Explanation: i think
Answer:
90 have 2 letters in their symbols
This distance-time graph represents a journey made by Jo (image above)
At what speed was Jo walking for the first 30 minutes?
(in km/h)
Answer:
1 km per 10 minutes
Explanation:
Based on the map that's my conclusion
Answer:
It's actually 6 km/h and for b) it's 10 minutes
Explanation:
At 30 minutes the distance was 3km, so you multiply it by 2 to get 6km.
And then it's 10 minutes for part B)
Which mineral is hard enough to scratch calcite? *
1 talc
2 sulfur
3 halite
4 quartz
Answer:
Should be number 4, quartz.
Explanation:
Quartz is rougher than calcite, therefore it's able to scratch it.
The location and arrangement of electrons in an atom (for example: 1s^2 2s^2 2p^6) is called the atom’s ____________________ .
a
electron configuration
b
electron dot diagram
c
atomic address
d
principle energy level
Answer:
A
Explanation:
Do you think that one mole of the difference substances have the same amount?
Answer:
yes, the amount doesn’t change, only the mass changes
How many atoms are in 4.9 moles of Sodium (Na)?
a
112.7 atoms
b
6.022 X 10 ^ 23 atoms
c
2.95 X 10 ^ 24 atoms
d
8.14 X 10 ^ -24 atoms
Answer:
C.) 2.95 x 10^24
Explanation:
make a ratio
1 mole = molar mass x 6.023 x 10^23
# moles = x
1 mole= 22.9 x 6.023 x 10^23
4.9 moles= x
cross multiply
then divide
= 2.95 x 10^24
can someone help me with this
Answer:
phosphorous- 5
calcium- 2
nitrogen- 3 or 5
iron- 8 (transition metals use subshells as valence electrons)
argon- 8
potassium- 1
helium- 2
magnesium- 2
sulfur- 6
lithium- 1
iodine- 7
oxygen- 6
barium- 2
aluminum- 3
hydrogen- 1
xenon- 8
copper- 1
Source: my own chemistry notes
How many atoms are in 1.5 moles of iron?
Answer:
One mole of anything is 6.022×1023 everythings, including atoms. Multiply the moles Fe by 6.022×1023 atoms/mol. 3.77mol Fe ×6.022×1023atoms Fe1mol Fe =2.27×1024 atoms Fe rounded to three significant figures.
The number of atoms present is 1.5 moles of iron is 9.0 ×10²³ atoms
From the question,
We are to determine the number of atoms present in 1.5 moles of iron.
From the formula,
[tex]Number\ of\ moles = \frac{Number\ of\ atoms}{Avogadro's\ constant}[/tex]
Then, we can write that
Number of atoms = Number of moles × Avogadro's constant
∴ Number of atoms of iron present = 1.5 × 6.022×10²³
Number of atoms of iron present = 9.033 ×10²³ atoms
Number of atoms of iron present ≅ 9.0 ×10²³ atoms
Hence, the number of atoms present is 1.5 moles of iron is 9.0 ×10²³ atoms
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