Answer:moles = 2.9 g Ni × 1 mol Ni 58.69 g Ni = 0.0663 mol Ni
Which of the following conclusions might a scientist make when fossils of two different species of very similar organisms are found in different layers of rock?
Question 2 options:
A. Both organisms had similar behaviors.
B. One organism was prey for the other organism.
C. One organism was ancestor of the other organism.
D. Both organisms lived around the same time.
Answer:
if its multiple, C and D, if not, C
Explanation:
brainliesttt?
One organism was ancestor of the other organism and both organisms lived around the same time is the conclusion made by scientist.
Who are fossil scientist?Fossil scientist are the specialists in studying the ancient fossils of animals and plants.
If fossils of two different species of very similar organisms are found in different layers of rock then it might be the possibility that one organism was ancestor of the other or both organisms lived around the same time. Because it is not necessary that if two species had the same organism then they have same behavior.
Hence, option (c) & (d) is correct.
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what is the difference between base alkali and acid in chemistry?
Answer:
Acids are sour in taste while bases have bitter taste for example Soap
Acids turn Blue litmus to Red While Bases turn Red litmus to Blue
Acids are Corrosive in concentrated form while bases Are non corrosive except concentrated form of NaOH and KOH
Answer:
1 . acid
a) acid are proton donors / electrons pair acceptors .
b) it have pH value < 7.
c) acids taste sour .
2 . base alkali
a) bases are proton acceptors/ electron pair donors .
b) it have pH value < 7 .
c) bases taste soupy .
Explanation:
may it helps you ....
of what does sand consist
Answer:
Sand is typically made mostly of varying amounts of material weathered from inland rocks and transported to the beach on the wind or in rivers, and/or shells and other hard parts precipitated out of the ocean water by marine organisms. Sand therefore records processes at a variety of timescales.
Explanation:
What is the balanced chemical equation of CO2 + H2O = C2H5OH + O2?
Select the correct answer.
What is the chemical name of the compound Ti2O3? Use the list of polyatomic ions and the periodic table to help you answer.
A.
titanium oxide
B.
titanium(II) oxide
C.
titanium(III) oxide
D.
titanium trioxide
Answer:
titanium(III) oxide is the name of Ti2O3
9. I have the lowest electronegativity of the nonreactive elements. My family name is ____________. I am classified as a ___________. I have _____________ valence electrons.
Answer:
I have the lowest electronegativity of the nonreactive elements. My family name is alkali metals. I am classified as a reactive metal. I have one valence electrons.
Explanation:
Electronegativity refers to the ability of the atoms of an element to attract electrons to itself. Based on their nature, non-metals are electronegative elements whereas metal are electropositive as they have a tendency to give up their electrons rather than attract electrons to themselves.
In the periodic table of elements, non-metallic character, and hence, electronegativity increases from left to right across a period, and decreases down a group. The most electropositive element is fluorine. On the other hand, electropositivity decreases across a period from left to right but increases on going down a group. Hence, the most electropositive element is Francium. This also means that Francium is the least electronegative element,
francium belong to the group 1A of the periodic table which are the most reactive metals. The family of group 1A elements are known as alkali metals. They possess only one valence electron which they easily give up to form univalent positive ions or cations. Francium is a radioactive element.
Which two types of rock could form after other rock melts into liquid
magma?
6 of 10 QUESTIONS
Sedimentary
Metamorphic
Intrusive igneous
Extrusive igneous
Answer:
The answer is intrusive igneous and extrusive igneous.
Explanation:
I’ve done the question on A P E X
You can fit 25 drops of substance X on a penny and 12 drops of substance Y on a different penny. Explain the difference in terms of strength of IMF.
Answer:
In the experiment performed involving the number of liquid drops that a penny can hold, 25 drops of substance X can fit in a penny while only 12 drops of substance Y can fit on another penny because, substance X is more viscous than substance Y. Thus, the intermolecular forces present in substance X are stronger than those present in substance Y.
Explanation:
Intermolecular forces (IMF) are the forces which exist between the neighboring molecules of a a substance. These forces, though weaker than intramolecular forces which acts between neighboring atoms, they still are responsible for several differences in the physical properties of substances with comparatively similar molecular masses.
The three major types of intermolecular forces are, hydrogen bonding, dipole–dipole interactions and London dispersion forces.
The existence of intermolecular forces in molecules of substances results in increase in melting and boiling points, surface tension, capillary action, viscosity, as well as surface area of substances,
Viscosity, which is the resistance to flow offered by a liquid increases with increase in the intermolecular forces between the molecules of a liquid.
In the experiment performed involving the number of liquid drops that a penny can hold, 25 drops of substance X can fit in a penny while only 12 drops of substance Y can fit on another penny because, substance X is more viscous than substance Y. Thus, the intermolecular forces present in substance X are stronger than those present in substance Y.
With 11 electrons how many electron shells does sodium have?
Answer:
3 Shells
Explanation:
2 electrons in shell one, 8 in shell two and only 1 in shell three.
Answer:
3 shells
Explanation:
which of the following classification groups is the most specific? family or order
Select the correct answer.
In which reaction is precipitation occurring?
A.
MgCl2(aq) + CuSO4(aq) → CuCl2(aq) + MgSO4(aq)
B.
CdSO4(aq) + K2S(aq) → CdS(s) + K2SO4(aq)
C.
NaOH(aq) + NH4Cl(aq) → NaCl(aq) + NH4OH(aq)
D.
K2SO4(aq) + NaOH(aq) → K2OH(aq) + NaSO4(aq)
E.
HNO3(aq) + KOH(aq) → KNO3(aq) + H2O(l)
Answer:
B. CdSO4(aq) + K2S(aq) → CdS(s) + K2SO4(aq)
Explanation:
A precipitate reaction is when a solid forms, so in this case CdS is the precipitate.
Calculate how many grams of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al2O3).
4Al + 3O2 → 2Al2O3
i need this like rn please.
Answer:
0.347
Explanation:
Al is the limiting reagent.
Explanation:
The stoichiometry of the reaction is such that 4 moles of Al are required for every 3 moles of diatomic oxygen. This means that if the ratio of Al to diatomic oxygen is greater than 4/3, then the oxygen is the limiting reagent. If the ratio of Al to diatomic oxygen is less than 4/3, then Al is the limiting reagent.
The problem state that the ratio of Al to diatomic oxygen is
0.32
0.26
=
16
13
=
48
39
<
52
39
=
4
3
The ration of Al to diatomic oxygen is less than 4/3, so Al is the limiting reagent.
We can also see this if we ask the question "How much Aluminum" is required to completely react 0.26 moles of diatomic oxygen??
0.26
moles
O
2
×
4
moles
A
l
3
moles
O
2
≈
0.347
moles
A
l
So it would take 0.347 moles of Al to completely react with all of the oxygen, however there is only 0.32 moles of Aluminum present, so there is not enough Al to react with all of the oxygen, and so we say that the Al is the limiting reagent.
The mass of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃) is
What is mass?
Mass of any element is equal to the product of its number of moles and molar mass.
For the compound, Aluminum oxide (Al₂O₃)
The atomic masses of Aluminum is 23 and oxygen is 16.
Molecular or molar mass = ( 2 × 23 ) + ( 3 × 16 ) units
M = 46 + 48 = 94 units
The mass of Aluminum in 1 mole of aluminum oxide ,46 grams in 94 grams
Mass of Aluminum in the given 21.6 g of Aluminum oxide will be;
94 grams of Aluminum oxide contains 46 grams of Aluminum.
21.6 grams of Aluminum oxide will contain ( 46 / 94 ) × 21.6 = 10.57g of Aluminum.
Therefore, 10.57g of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al₂O₃)
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what sre the group 17 elements are known as
Answer:
Halogen
Explanation:
the first element was full brittle and did not conduct heat
Answer:
non-Metals
Explanation:
How many molecules of water are produced by the combustion of 3.00 g of methane
A surplus (having “extra”) or deficit (having “fewer”) of electrons?
Answer:
Charge
Explanation:
A surplus (having "extra") or deficit (having "fewer") of electrons possessed by an object. A charge can cause attractive or repulsive forces which can be observed in some cases (e.g. pith balls, bits of plastic).
Given the rate law R = k[X][Y]2 and the data in the chart, what is the value of the rate constant for the reaction?
A. 0.029
B. 0.52
C. 35
D. 52
Answer:
C.) 35
Explanation:
Answer:
35 is the correct answer (c)
Two students performed a lab to see how the density and salinity of water are related. Both beakers began with the same salinity level. Beaker A was left alone, and B was placed under a heat lamp. Students will check the salinity level in the water after a day. The results of the investigation showed that…
Answer: the water avaperatid
because of the heat lamp
hope this helps
Explanation:
Which is needed to determine the amount of gravitational force between two objects?
A. weight and time
B. distance and mass
C. volume and mass
D. area and weight
Answer: B
Explanation:
B. Distance and Mass
Newton's Law of gravitation states [tex]F=\frac{GMm}{r^2}[/tex]
G being a constant
M being mass 1
m being mass 2
r being the distance between them from their center of mass
how many grams of caffeine are found in 6.500 x 10^22 molecules of caffeine?
Answer:
21.614 grams are found in [tex]6.5 \times 10^{22}[/tex] molecules of caffeine.
Explanation:
The chemical formula for caffeine is [tex]C_{8}H_{10}N_{4}O_{2}[/tex], the molar weight of caffeine is:
[tex]M = 8\cdot \left(12.011\,\frac{g}{mol} \right) + 16\cdot \left(1.008\,\frac{g}{mol} \right)+4\cdot \left(14.007\,\frac{g}{mol} \right)+2\cdot \left(15.999\,\frac{g}{mol} \right)[/tex]
[tex]M = 200.242\,\frac{g}{mol}[/tex]
According to Avogadro's Law, a mol of caffeine contains [tex]6.022\times 10^{23}[/tex] molecules. The number of grams contained in [tex]6.5 \times 10^{22}[/tex] molecules is determined by simple rule of three:
[tex]x = \frac{6.5\times 10^{22}\,molecules}{6.022\times 10^{23}\,molecules} \times 200.242\,g[/tex]
[tex]x = 21.614\,g[/tex]
21.614 grams are found in [tex]6.5 \times 10^{22}[/tex] molecules of caffeine.
How many moles of H2 gas are in 15 liters?
What is the molality of a solution that contains 5.10 mol KNO3 in 4.47 kg water?
Elements that have some properties of metals and some properties of nonmetals
Answer:
metalloids aka semimetals
Explanation:
How many grams is 40.48 moles of cobalt?
Answer:
2385.49 grams of cobalt.
Explanation:
1. Convert 40.48 moles of Co (cobalt) into grams (mass):
The molar mass of cobalt is 58.933195 g/mol.
[tex]40.48 mol Co = \frac{58.93 g/mol}{1 mol Co} = 2385.49 g[/tex]
The manufacturer of an aerosol deodorant packaged in a 300 mL container plans to produce a container of the same size that will hold twice as much gas. How will the pressure of the gas in the new product compare with that of the gas in the original container?
Answer: It will get higher
Explanation: it’ll get higher because the pressure will increase
Which of the following reasons best explains why water isn
waxed surfaces? *
O the wax is a nonpolar substance that will not mix with polar wa
O the wax is a polar substance that will not mix with polar water
O the wax is a polar substance that will not mix with nonpolar wa
O the wax is a nonpolar substance that will not mix with nonpola
Answer:
the wax is a nonpolar substance that will not mix with polar water
Explanation:
Water is polar by due to the uneven distribution of charge between the hydrogen and oxygen. T=This automatically eliminates options 3 and 4.
Wax on the other hand is a non polar substance. Due to this non polar characteristic, it would not dissolve in water. The correct option is;
- the wax is a nonpolar substance that will not mix with polar water
PLEASE HELP DECODE THIS
The element symbol for the element with the atomic mass of 183.84 amu: (B1)
Which substances are made up of polymers?
DNA
a glass bottle
ice crystals
the proteins in hair
rubber car tires
Answer:
DNAA glass bottlethe proteins in hairRubber car tireAll these are made up of polymers.
Convert 4, 294 grams to pounds. Use the conversion factor 1 pound = 453.59 grams.
A sulfur atom weighs twice as much as an oxygen atom, If a chemist has 12grams of oxygen atoms, how many grams of sulfur would contain the same number of atoms as in the sample of oxygen atoms?
Answer: 24
Explanation: multiply 12 with 2