Answer:
D. People continue to selectively breed plants and animals to produce predictable results.
Explanation:
Gregor Mendel's work with pea plants affect human life today as a result of his ability to produce different results and genetic composition of pea plants through his crossing methods.
This laid the foundation for people today to continue to selectively breed plants and animals to produce predictable results which has lots of advantages associated with it.
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:
How many moles would there be in 20.0 g of sodium chloride?
Answer:
20.0/1 x 1mole/58.44=0.34
(Atomic mass of salt)
Been a minute since I've done this, but this is how I remember doing it, soo..hope this helps!
Which of the following terms means that metals can be pulled into thin strands or wires? [like copper]
A. polar
B. alloy
C. ductile
D. malleable
Answer:
D
Explanation:
plz mark brainliest answer if it helps
Answer:
C
Explanation:
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
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 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
Learn more here: https://brainly.com/question/22911047
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.
Read more about Starch here:
https://brainly.com/question/1237142
#SPJ6
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:
What is the type of reaction for the following: Silver nitrate + aluminum
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
Identify how many grams are there in 3.5 moles of carbon atoms
Answer:
3.5 moles of carbon = 42.03745 grams
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
The molar mass of a substance is 92.010g. The substance is 30.4% nitrogen and 69.9% oxygen. What is the empirical formula and the molecular formula of the substance
Answer:
Empirical formula = NO₂
Molecular formula = N₂O₄
Explanation:
Percentage mass of Nitrogen = 30.4 %
Percentage mass of Oxygen = 60.9 %
Mole ratio of the elements:
Nitrogen = 30.4/14 = 2.17
Oxygen = 69.9/16 = 4.37
Dividing by the smallest ratio to obtain a simple ratio
Nitrogen: 2.17/2.17 = 1
Oxygen; 4.37/2.17 = 2
Therefore, the simplest mole ratio is 1:2
Empirical formula = NO₂
Molecular formula = n(empirical formula), therefore, molecular mass = n *(empirical mass)
92.010 = n(14 + 32)
92.010 = 46n
n = 92.010/46
n = 2
Therefore, molecular formula = 2(NO₂)
Molecular formula = N₂O₄
true or false ?
an insoluble base will react with an acid.
Answer:
true maybe
Explanation:
#CarryOnLearning
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:
How many grams of hydrogen are produced from the reaction of 8.50 moles of zinc with an excess of hydrochloric acid?
Zn+2HCl = ZnCl2+H2
Answer:
17.136 g H2
Explanation:
First we need to convert moles of Zinc to moles of Hydrogen in order to find out how many moles of hydrogen are produced.
When we look at our balanced equation, we can see that for every mole of Zn reacting, there is 1 mol of H2 produced. (imagine a 1 in front of the elements that have no numbers in front of them)
8.5 mol Zn * [tex]\frac{1 mol H_{2} }{1 mol Zn}[/tex] = 8.5 mol H2
Now we will convert from moles of Hydrogen to grams
The atomic mass of H2 is 2(1.008) g/1 mol... so we will use this to convert to the number of grams of Hydrogen produced..
8.5 mol H2 * [tex]\frac{2(1.008)grams H2}{1 mol H2}[/tex] = 17.136 g H2
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
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.
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:
What determines the ratio of ions in an ionic compound?
O A. The charges on the ions
O B. The electronegativity of each atom
O C. The number of bonds formed
D. The period the atoms are in
Answer:
i belive the answer is A if it's not i am very sorry
Protons-29
Neutrons
35
electrons-29
Atomic Mass-64
Answer:
atomic mass=Protons+Neutrons=29+35=64
Explanation:
please complete question.
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
why is radioactive decay considered an exponential process
Answer:
It breaks down in mathematically exponential way.
Explanation:
For example if you have 100 grams, after the first decay, its 50. Then 25. Then 12.5, and so on. Rather than, say, 5 grams being subtracted every cycle, it is dilated by the factor of a fraction, making it exponential.
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! :)
Pls help 2 parts science
Atoms are neutral because the number of
A
protons equals the number of neutrons
B
protons equals the number of electrons
C
neutrons is greater than the number of protons
D
neutrons is greater than the number of electrons
Answer:
I'm pretty sure it's b sorry if I get it wrong
How does an atom end up with an octet, if it loses all of the electrons in its valence shell
Answer:
When atoms have fewer than eight electrons, they have an inclination to react and type a lot of stable compounds.
Thus, associate atom continues to create bonds till associate octet of electrons is formed. this can be called octet rule by Lewis.
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]
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
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:
