In terms of valence electrons, explain why metals form positive ions.
Answer:
Explanation:
Metal elements form positively charged ions called cations because they are located on the left side of the periodic table These elements all have valence electrons in an s orbital. These electrons are relatively easy for the atom to lose to achieve a stable octet of electrons in its outermost energy shell.
When thermal energy is removed from matter, what happens to the molecules?
Answer:
Figure it out.
Explanation:
2. How many carbon atoms would be in 2 MOLES of carbon?
Answer:
In one mole of carbon , there are 6.02 × 1023 atoms. so in two moles , there will be twice that = 1.204× 1024.
What is the mass of chlorine in 3.9 x 1019 molecules of Cl2?
Explanation:
A photon is a quantum of EM radiation. Its energy is given by E = hf and is related to the frequency f and wavelength λ of the radiation by
E=hf=hcλ(energy of a photon)E=hf=hcλ(energy of a photon),
where E is the energy of a single photon and c is the speed of light. When working with small systems, energy in eV is often useful. Note that Planck’s constant in these units is h = 4.14 × 10−15 eV · s.
Since many wavelengths are stated in nanometers (nm), it is also useful to know that hc = 1240 eV · nm.
These will make many calculations a little easier.
All EM radiation is composed of photons. Figure 1 shows various divisions of the EM spectrum plotted against wavelength, frequency, and photon energy. Previously in this book, photon characteristics were alluded to in the discussion of some of the characteristics of UV, x rays, and γ rays, the first of which start with frequencies just above violet in the visible spectrum. It was noted that these types of EM radiation have characteristics much different than visible light. We can now see that such properties arise because photon energy is larger at high frequencies.
Mix 200 g of copper at 100 °C with 1,000 g of water at 20 °C. Final temp. = 21.42°C a) How much heat energy (q) did the water gain? b) Now solve for the specific heat (c) of copper:
Answer:
a) [tex]Q_w=5941.3J[/tex]
b) [tex]C_{Cu}=0.378\frac{J}{g\°C}[/tex]
Explanation:
Hello there!
In this case, when a hot substance is mixed with a cold one, we can evidence how the hot one is able to heat up the cold one as it cools down. Thus, the net heat flow for this problem can be set up as shown below:
[tex]Q_{Cu}+Q_{w}=0[/tex]
Whereas the heats can be written in terms of mass, specific heat and temperatures:
[tex]m_{Cu}C_{Cu}(T_F-T_{Cu})+m_{w}C_{w}(T_F-T_{w})=0[/tex]
Thus, we proceed as follows:
a. Here we compute Qw:
[tex]Q_w=1,000g*4.184\frac{J}{g\°C}(21.42\°C-20\°C) \\\\Q_w=5941.3J[/tex]
b. Now, since this heat is equal to the negative of the heat contribution of copper (as it cools down), we can compute the specific heat of copper as shown down below:
[tex]C_{Cu}=\frac{-5941.3J}{200g(21.42\°C-100\°C)} \\\\C_{Cu}=0.378\frac{J}{g\°C}[/tex]
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Sandban
Grade 8 Science Winter Interim
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Question 3
Twoiron balls are dropped from a height of 100 meters One Dal Frame A) is not moving when it is dropped and the second ball is moving horizontally at a constant velocity of 10 m/s when it is dropped (Frame B). The balls follow the
trajectories indicated by the arrows and fall for 4,52 s before hitting the ground. (Ignore air resistance)
Frame A
Frame B
1kg
-10%
10kg
Read the description of the centrioles. What is their function?
Answer:
Typically found in eukaryotic cells, centrioles are cylindrical (tube-like) structures/organelles composed of microtubules. In the cell, centrioles aid in cell division by facilitating the separation of chromosomes. For this reason, they are located near the nucleus.
I need help I don’t get this
Answer:
Visit: gotit-pro.com
Explanation:
as insoluble ...... can be separated from a liquid by filtration on centrifugation
Answer:
by centrifugation
Explanation:
in such cases filtration cannot be used for separation
Which equation has x = 5 as the solution?
2x = 5
2x = 5
x - 10 = 15
x - 10 = 15
x + 15 =10
x + 15 =10
2x = 10
Answer:
x-10 should be the answer
An ideal gas occupies a volume V at an absolute temperature T. If the volume is halved and the pressure kept constant, what will happen to it's temperature?
a. It will halve to T/2.
b. It will increase to 3T.
c. It will increase to 2T.
d. It will remain the same.
Answer:
It will be halve of T
Explanation:
V1 = V
T1 = T
V2 = ½V
T2 = x
V1/T1 = V2/T2
V/T = ½V/x
Vx = ½VT
2Vx = VT
2x = T
x = ½T
A 30.0 mL aliquot of 0.0250 M HCl solution is titrated using 0.0500 M NaOH.
A) determine the volume of NaOH necessary and the pH at the equivalence point.
B) Determine the pH of the solution after 160.00 mL base is added.
Answer:
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hkgkfu
Explanation:
iyxyx yo gkxtuztizyidtiztizigxigxkhxhk. jvkgxitxoyfihciyxyixihxoyxyodyidtistusdtidti lo siento
A carrier *
Organism that transmits disease through blood
O Person or animal that is infected with the disease but is asymptomatic
O Used to treat a bacterial infection, cannot be used to prevent an infection
Used to prevent a viral infection, must be given before the person is infected
Answer: carrier, is a person or other organism that has inherited a recessive allele for a genetic trait or mutation but usually does not display that trait or show symptoms of the disease. Carriers are, however, able to pass the allele onto their offspring, who may then express the genetic trait.
i think it is Person or animal that is infected with the disease but is asymptomatic
Explanation:
hlo ;) lol im banned and my name is kimboslicer it is so sad my accout is bloked 4 23:12
Answer:
lol im sorry man
Explanation:
Answer:
My old acc got banned
Explanation:
Witch event signals the birth of a star
Answer:
It's either C or D
Explanation:
I'm learning this too! :)
.When sodium atoms (Na) and chlorine atoms (Cl) join to make sodium chloride, or table salt, they form an ionic bond. Using this information, which pair of elements is most likely to form an ionic bond?
potassium (K) and fluorine (F)
aluminum (Al) and aluminum (Al)
sulfur (S) and oxygen (O)
calcium (Ca) and neon (Ne)
Answer:
potassium (K) and fluorine (F)
Explanation:
Potassium is an alkali metal just like sodium and fluorine is a halogen just like chlorine. A metal and nonmetal will often join to form an ionic compound.
Aluminum, if it was going to bond to itself, would be a metallic bond.
Sulfur and oxygen are both nonmetals and would form a covalent bond.
Calcium would not bond with neon as neon is a noble gas.
Answer:
A) potassium (K) and fluorine (F)
Explanation:
got it right on time for learning :)
3.
Plant A
Plant B
Is tall
Is short
Has many large deep roots Has many small short roots
Has many small leaves
Has many large leaves
Comes in many different colors comes in only one color
The table shows some observations made by a group of students studying plants they will use
in a flower garden. Which conclusion is best supported by these observations?
Silver nitrate reacts with calcium chloride as
shown.
2 AgNO3 + CaCl2 → 2 AgCl + Ca(NO3)2
How many grams of CaCl2 would be required to completely react with 420 mL of
0.506 M AgNO3 solution?
Answer in units of grams.
Answer:
11.8g of CaCl₂ would be required
Explanation:
To solve this question we need to find the moles of AgNO₃ in the solution. Thus, and using the chemical reaction we can find the moles of CaCl₂ required for a complete reaction and its mass as follows:
Moles AgNO₃:
420mL = 0.420L * (0.506mol / L) = 0.213 moles AgNO₃
Moles CaCl₂:
Based on the chemical reaction, 2 moles of AgNO₃ react per mole of CaCl₂.
The moles of CaCl₂ that will react are:
0.213 moles AgNO₃ * (1mol CaCl₂ / 2 mol AgNO₃) = 0.106 moles CaCl₂
Mass CaCl₂ -Molar mass: 110.98g/mol-
0.106 moles CaCl₂ * (110.98g / mol) =
11.8g of CaCl₂ would be requiredWhich of the greenhouse gases are carbon compounds?
Answer:
Methane (CH4),Carbondioxide green house gases are carbon compounds
Carbon dioxide (CO2) and methane (CH4) are two powerful greenhouse gases produced by the carbon cycle.
if carbon dioxide is broken down. what element will it give?
help fast plssssssssssssssssssss
The process of water changing from a liquid to solid is called?
Answer:
freezing
Explanation:
When a solid reaches the temperature of its melting point, it can become a liquid. For water, the temperature needs to be a little over zero degrees Celsius (0oC) for you to melt. ... The reverse of the melting process is called freezing. Liquid water freezes and becomes solid ice when the molecules lose energy.
hope it becomes helpful to you ☺️☺️
good luck
Covalent bonds form due to the attraction between _____.
a positive atomic nucleus and a negative one
the nuclei of two atoms
the electrons of two atoms
the electrons of one atom and the nucleus of another
Answer:
the electron of one atom and the nucleus of another
A weight of 8.7 N is attached to a spring that has a spring constant of 190 N/m. How much will the spring stretch?
Given values are:
Force, Fs = 8.7 NSpring constant, k = 190 N/mAs we know the relation,
→ [tex]Fs = K\times x[/tex]
or,
→ [tex]x = \frac{Fs}{k}[/tex]
By putting the values, we get
[tex]= \frac{8.7}{190}[/tex]
[tex]= 4.6\times 10^{-2} \ m[/tex]
Thus the response above is right.
Learn more about spring constant here:
https://brainly.com/question/15404289
in____particles are in contact with each other.
Answer:liquid
Explanation:
The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.
which one of the following forces is a contact force force of gravity or force of friction
Answer:
a force of friction would be like something moving that suddenly stops because of the texture of another object while a force of gravity would be something falling and gravity pulling it down :) hope this helps
Explanation:
Which reactions are oxidation-reduction reactions? Check all that apply.
(1) 2 upper N a plus upper C l subscript 2 right arrow 2 upper N a upper C l.
(2) Upper P b (upper O upper H) subscript 2 right arrow upper P b upper O plus upper H subscript 2 upper O.
(3)Upper C u plus 2 upper A g upper N upper O subscript 3 right arrow upper C u (upper N upper O subscript 3)subscript 2 plus 2 upper A g.
(4)Upper Z n upper B r subscript 2 plus 2 upper A g upper N upper O subscript 3 right arrow 2 upper A g upper B r plus upper Z n (upper N upper O subscript 3) subscript 2.
(5)Upper C upper H subscript 4 plus 2 upper O subscript 2 right arrow upper C upper O subscript 2 plus upper H subscript 2 upper O.
answer- 1,3, & 5
explanation- I did it on edge 2021
Answer:
the 1st 3rd and 5th ones
EDGE 2021
Explanation:
Answer:
A
C
E
Explanation:
Give two examples of elevation.
Answer:
An example of elevation is a plane flying at 36,000 feet above the ground. An example of elevation is a pope being raised to the position of saint. An example of elevation is a ballet dancer leaping three feet in the air. ... At 8,850 m (29,028 ft), the summit of Mount Everest is the highest elevation on Earth.
Explanation:
please mark me brainly!
True or false: All molecules or atoms in a substance have the same amount of kinetic energy at a given temperature?
Answer:
false
Explanation:
Difference in neutrons in a molecule means that molecules have different masses. They will always have different energies
another example: water has less energy as a liquid than as a gas
How do you find the scientific notation of a Avogadro's number??
Answer: ummmmmm hmmmmm
Explanation: