Answer:
Catalysts help in increasing rates of reactions
Answer:
тємρєяαтυяє
Explanation:
Temperature. Usually reactions speed up with increasing temperature.
Why is the periodic table not arranged by atomic weight and instead arranged by atomic number?
At before Duberinor,Mendeleev tried to use atomic weight but they failed .
can anyone heelp me pls
Answer:
lotion 2. capsule 3. suspension 1.
What is the molarity of a solution that contains 0.505 mol KCl (molar mass = 74.55 g/mol) in 7.98 L of solution?
Answer:c
=
0.0253 M
Explanation:
Molarity is a measure of a solution's concentration in terms of how many moles of solute it contains per liter of solution.
So, in essence, if you have the number of moles of solute, like you do here, and the total volume of the solution expressed in liters, you can find how many moles of solute you get per liter, i.e. the molarity of the solution.
Keeping in mind the fact that the moles of solute are distributed evenly in any given volume of the solution, you can say that because
7.98 L
of solution contain
0.202
moles of solute, which in your case is potassium chloride,
KCl
,
1 L
of this solution will contain
1
L
⋅
0.202 moles KCl
7.98
L
=
0.0253 moles KCl
So, if your solution contains
0.0253
moles of potassium chloride per liter, it follows that its molarity is equal to
c
=
0.0253 M
Here
M
is equivalent to
mol/L
, or molar.
The molarity of the solution that contains 0.505 mol KCl in 7.98 L of the solution is 0.0632 moles/L.
What is called the Molarity of a solution?Molarity is a measure of a solution concentration in terms of how many moles of solute it contains per liter of solution.
Molarity = Moles of solute / Liters of solution
Its unit is mole/L
Calculating the molarity of the given solution:Given that a solution contains 0.505 mol KCl in 7.98 L of solution
Moles of solute (KCl) = 0.505 mol
Liters of solution = 7.98 L
Then, the molarity will be
M = [tex]\frac{0.505}{7.98}[/tex]
= 0.0632 moles/L
Therefore, the molarity of the given solution is 0.0632 moles/L.
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Which property describes a material's ability to conduct heat?
b. How does government funding affect scientific progress? (1 point)
Answer:
29 percent of federal R&D money goes to universities, 29 percent goes to industry, and another 29 percent goes to researchers who work directly for federal agencies. About 10 percent goes to federally funded labs operated by private contractors.
Answer:
Explanation:
Funding from the government greatly affects the scientific research as a research can take number of years to complete. During this time period lot of financial support is required as there might be lot of expensive chemicals or substance that the scientist requires for his research.
Models are used to predict behaviors in the real world.
True
False
By referring to particles, explain why the white ring formed in the glass tube
Answer:
Ammonia and Hydrogen Chloride.
Explanation:
Assuming this is what you're referring to, Ammonia (NH3) and Hydrogen Chloride(NCI3). The concentrated ammonia (NH3) is placed on a pad in one end of a tube and hydrochloric acid (NCI3) on a pad at the other. Shortly after the gases will begin diffusing far enough to meet, a ring of solid ammonium chloride (NH4Cl) will be formed.
Please help! I will give 100 pts and brainliest if it is good.
Answer:
group 1 element 6
group 2 element 3
group 11 element 1
group 14 element 2
group 17 element 4
group 18 element 5
Explanation:
Answer:
Explanation:
group 1 element 6
group 2 element 3
group 11 element 1
group 14 element 2
group 17 element 4
group 18 element 5
Which two phrases describe the movement of thermal energy due to
convection currents in the water on Earth?
O A. From the bottom of the ocean to the surface
B. From the surface of the ocean to the bottom
C. From cooler parts of Earth to the equator
D. From the equator to cooler parts of Earth
Answer:
D. From the equator to cooler parts of Earth
Explanation:
Thermal energy is always transferred from an area with a higher temperature to an area with a lower temperature. Moving particles transfer thermal energy through a fluid by forming convection currents.
Answer:
B. From the surface of the ocean to the bottom
D. From the equator to cooler parts of Earth
Explanation:
Test approved
Please help me I can’t figure it out
1. Calculate the wavelength of light with a frequency of 1.89 x 1018 Hz.
a
Answer:
1.92402 kilohertz
Explanation:
hope this helps
Answer:
• From wave equation :
[tex]{ \rm{v = f \lambda}}[/tex]
v is velocity, v = 3.0 × 10^8 m/sf is frequencylambda is the wavelength[tex]{ \rm{3.0 \times {10}^{8} = (1.89 \times {10}^{18}) \times \lambda}} \\ \\ { \rm{ \lambda = \frac{3.0 \times {10}^{8} }{1.89 \times {10}^{18} } }} \\ \\ { \boxed{ \rm{ \: \lambda = 1.587 \times {10}^{ - 10} \: }}}[/tex]
Is oxygen a necessary reactant for an oxidation reaction? Explain
Answer:
So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).
The oxidation reaction does not require oxygen as a reactant. An atom, molecule, or ion loses one or more electrons during the chemical process of oxidation, increasing its positive charge.
What is oxidation ?When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction.
A molecule is said to be oxidized when oxygen is added to it or when hydrogen is taken out of it. Reduction is the process of introducing hydrogen or removing oxygen from a molecule.
An element is oxidized if it loses electrons, which is another definition of oxidation. Any electron acceptor can oxidize an element by taking in the lost electrons, hence oxygen is not a necessary component in oxidation.
The process of converting glucose into ATP requires oxygen. For each glucose, the first step only releases two molecules of ATP.
Thus, The oxidation reaction does not require oxygen as a reactant.
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What is the sum of the atomic numbers of each element present in the reactants of the given formula?
2 NH3 + H2SO4 → (NH4)2SO4
Answer:
25
Explanation: They all add up to 25 Atoms
The atomic number of nitrogen is 7 and that of oxygen is 8. Atomic number of hydrogen is one and the atomic number of sulphur is 16. Then, the sum of atomic numbers of each element present in the reactants of the given formula is 32.
What is atomic number ?The atomic number of an atom is the number of electrons in its neutral state. This number is equal to the number of protons also. The modern periodic table classify all elements based on their atomic numbers.
The sum of number of protons and neutrons of an element is called its mass number. For the given formula, the elements present are H, O, N and S.
atomic number of H = 1
atomic numebr of N = 7
atomic number of O =8
atomic number of S = 16.
Then ,sum of atomic number s= 1 + 7 + 8 + 16 = 32.
Therefore, the sum of the atomic numbers of each element present in the reactants of the given formula is 32.
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write the electronic configuration of iron in fecl2 and fecl3
Ferrus is a transition metal.
FeCl_2
Valency of Fe is 2 .Hence Z=26-2=24Electronic configuration is given by
[tex]\\ \sf\longmapsto [Fe]^{2+}=1s^22s^22p^63s^23p^64s^23d^4[/tex]
FeCl_3
Valency of Fe is 3Hence Z=26-3=23Electronic configuration is given by
[tex]\\ \sf\longmapsto [Fe]^{3+}=1s^22s^22p^63s^23p^64s^23d^3[/tex]
John Dalton thought that atoms
1. Cannot be broken down further
2. Have no mass
3. Contain molecules
4. Are all composed of carbon
Answer:
cannot be broken down further
How do we find the atomic size of an atom?
Answer:
The size of an atom can be estimated by measuring the distance between adjacent atoms in a covalent compound. The covalent radius of a chlorine atom, for example, is half the distance between the nuclei of the atoms in a Cl2 molecule.
High temperatures inside Earth form
melted rock.
fossils.
soil.
minerals.
Answer:
minerals
Explanation:
Hope this helps
What happens when the compound CaCl2 forms?
Explanation:
Calcium gives valence electrons to both chlorine atoms so that they have a full outer shell.
Question 1 of 5
An atom's nucleus contains 8 particles that have no charge and 6 particles
that are positively charged. What is the atomic number of the atom?
A. 2
O
B. 8
C. 6
D. 14
SUBMIT
Answer:
C. 6
Explanation:
The atomic number of a number is related to the number of protons in the nucleus.
How many molecules are in 8.27 mol of SiH,?
Answer:
from,
moles,n = number of particles, N
Avogadro constant
N = 8.27 * 6.022×10^23
N = 4.98 × 10^ 24particles.
In 8.27 moles of SiH, there are
4.98 × 10^24particles.
A supermassive black hole can be found at
Location 1
Location 2
Location 3
Location 4
Answer:
location 2
Explanation:
How many unpaired electrons does fluorine have in its ground state electron configuration?
Answer:
1 unpaired electron (s)
Explanation:
Silicon dioxide is a solid at room temperature and methanol is a liquid. What substance has the higher melting point?
Answer:
methanol because it is liquid at room temperature which means that it melts at a lower temperature
Silicon dioxide is a solid at room temperature and methanol is a liquid. Silicon dioxide has a higher melting point than methanol because silicon dioxide is solid, and with increasing temperature, it will melt.
What is a melting point?Melting point is that point or temperature at which the solid items are converted into liquid, and it changes their atoms and the atoms lose their compactness.
Here, two compounds are given, Silicon dioxide and methanol, the first one is solid at room temperature, so it will need more temperature to melt down and methanol is still liquid at room temperature, so its melting point is low.
Thus, methanol is a liquid while silicon dioxide is a solid at ambient temperature. Because silicon dioxide is a solid and melts at greater temperatures, it has a higher melting point than methanol.
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What are the products of the chemical reaction shown?
CH4+2O2 --> CO2 + 2H2O
Question 10 options:
CH4 and O2
O2 and H2O
CO2 and H2O
CH4 and CO2
Answer:
CO2 AND H20 I THINK IM 99 PERCENT SURE
Determine the number of moles in 3.13 × 10²³ formula units of MgCl₂.
Answer:
0.52 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.13 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.13}{6.02} \\ = 0.519933[/tex]
We have the final answer as
0.52 molesHope this helps you
What is the density of the marble?
0.22 g/mL
1.67 g/mL
60 g/mL.
460 g/mL
Explanation:
option B is the correct answer, 1.67g/mL.
hope this helps you.
A(1,2),B(1,4),C(6,2),
Answer:
????
Explanation:
where's the question
Low tides are located at___
A an C
A an B
B an D
Answer: A and C
Explanation:
Low tides occur in locations at 90 degree angles to the moon. Tidal cycles have the same length as the lunar day, 24 hours and 50 minutes. In this time span, most locations will experience two high tides, when the location is close to and far from the moon, and two low tides. Sides A and C are angled 90 degrees from the moon.
Hence, low tides are located at A and C.
Answer:90 degree angles to the moon.
Explanation:
PLS I NEED HELP QUICKKKKK
Match each example to the type of wave.
B. Longitudinal wave
A. Transverse wave
C. Combination of longitudinal and transverse wave
D. Infrared wave
E. Radiant energy
F. Microwaves
G. Ultraviolet waves
Answer: These are all examples of the waves you listed
B- Soundwave, ultrasound waves
A-Surface ripples on water
C- water waves
D-The heat that we feel from sunlight, a fire, a radiator or a warm sidewalk is infrared.
E-The heat emitted from a campfire.
F-Long Distance Wireless Transmission. Most wireless transmission systems are based on microwave technology.
G- Disinfectants
Explanation:
Hope this helps!!
Have a nice day!
Fat is a ____________ (Body Buiding / Energy Giving / Protective ) food.
Fat is a energy giving , protective food
hope it helps
I give my best answer almost
Summarize the steps of water cycle
Answer:
The water cycle consists of three major processes: evaporation, condensation, and precipitation. Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.
Explanation: