Answer:
c
Explanation:
Molar mass of Na=23g/mol
amount of mole(n)=3
mass=?
therefore,n=m/M
3mol=m/23g/mol
m=23g/mol ×3mol
m=69g.
____33. When an atom undergoes gamma decay, the atomic number of the element
a. remains the same.
b. decreases by one.
c. increases by one.
d. increases by two.
____34. Radioactive materials change into new _______________ during radioactive decay.
a. compounds
b. atoms of the same material
c. elements
d. neutrons
____35. Nuclear fission is the:
a. Production of uranium.
b. Splitting of protons by bombarding them with neutrons.
c. Splitting of atoms by bombarding them with neutrons.
d. Result of neutrons smashing into each other.
____36. During fission:
a. Electrons are released and cause more fission.
b. Protons are released and cause more fission.
c. Uranium is produced.
d. Neutrons are released and cause more fission.
____37. Separating U-235 from U-238 was difficult because:
a. There was so much more U-235 than U-238
b. There was so much more U-238 than U-235.
c. A chain reaction would result.
d. They are chemically identical.
Part IV: True/False
____ 38. The mass of the nucleus is small compared to the mass of the atom.
____ 39. Alpha particles would be harder to turn than Beta particles.
____ 40. Positive charge was spread all throughout the atom in the Rutherford Model.
____ 41. The Manhattan Project was located in New York for most of its duration.
____ 42. The cathode rays produced by Thomson were identical for all filaments.
____ 43. It is possible to know where an electron is and what path it is on.
____ 44. X-rays are produced when fast moving electrons strike phosphor coatings.
Answer: Because only energy is emitted during gamma decay, the number of protons remains the same. Therefore, an atom does not become a different element during this type of decay. Q: The Figure below shows how helium-3 (He-3) decays by emitting a gamma particle.
Answer:
yes
Explanation:
33c 32 c 33d 34a 35 b 36a 37 d
Whats the difference between an isolated storm and a cold front
I need help and if you don’t know you don’t have to tell me!
At Ocean World, Wally the Whale uses 800 Newtons of force to jump out of the water 10 meters into the air. Wally does this trick four times a day. He is able to get 10 meters high in 3.5 seconds. How much work does Wally do each day? What is his
average speed with each jump?
I need to the Force, Distance, time, Average speed and work!
Answer:
i did this assignment today, so u and i might be classmates :3 answer is shown below in 'explanation.'
Explanation:
the roller coaster assignment: force: 160 newtons. distance: 40 m high. time: 10 sec. work: 6400. average speed: 4 km.
for the whale assignment: force: 800 newtons. Distance: 10 meters. time: 3.5 seconds. work: 8,000 J. Average speed: 2.85
for the car: force: 1400 newtons. Distance: 800 m. time: 40 minutes. work: 1,120,000. average speed: 20.
moving company: force: 600. Distance: 80 m. time: 50 min. work: 48,000. average speed: 1.6.
I hope this is correct, bc i got 100% !! :3
Answer: I just added this so you can give the other person brainly
Which of the following is an example of an adaptation that might be useful in the grassland? HELP ME PLS
A. an insect looking like a tree branch
B. an animal having a heavy coat of fur
C. an animal having large feet so it can walk on the snow
D. an animal being the color of brown grass and dust
Answer:
D
Explanation:
In the grassland pretty warm so the heavy fur coat wouldn't help, there is no snow in the grassland so the big feet for walking on snow also wouldn't help, its the grassland where trees are more scarce so not A, but there is a lot of grass and dust so being able to blend in would help.
Answer:
D
Explanation:
AN animal this color can camouflage and it can help them so they will not be eaten by there predators
How are different isotopes determined?
Answer:
Atoms that have the same number of protons but different numbers of neutrons are known as isotopes. Isotopes have different atomic masses. The relative abundance of each isotope can be determined using mass spectrometry.
Explanation:
hope this helps!!! >_<
Answer: The relative abundance of each isotope can be determined using mass spectrometry.
Explanation: Atoms that have the same number of protons but different numbers of neutrons are known as isotopes. Isotopes have different atomic masses
hope this helps :)
What does converse mean
Answer:
engage in conversation.
Explanation:
Answer: the process of changing or causing something to change from one form to another.
Explanation:
please help with both of these lol
Answer: 1. Unbalanced
2. Atoms cannot be created or destroyed only rearranged
Explanation:
atoms, predict the ratio of metal cationic (+) atom
to nonmetal anionic (-) atom in the compound.
Lithium 1s22s1
Chlorine 1s22s22p6 3s23p5
A. 1:1
B. 1:2
C. 2:1
D. 3:1
D. 3:1
Answer:
A. 1:1
Explanation:
Lithium 1s2 2s1
Chlorine 1s2 2s2 2p6 3s2 3p5
Lithium is a group 1 element. When it forms a compound, it loses it's one valence (outermost) electron.
Chlorine is a group 7 element. When it forms a compound, it gains one electron to achieve a stable electronic configuration.
Since Li loses one electron and Cl gains one electron. The formular of the compound formed would be;
LiCl
The correct option is;
A. 1:1
Question 13 (3 points)
.Which one of the following is not a scientific variable?
independent
statement
O control
dependent
if I have a +2 oxidation number do I give up or accept electrons?
Answer:
Give up 2 electrons.
Explanation:
Is this ever a good question!!!
Electrons have a minus charge
Protons have a plus charge.
You need to understand it thoroughly. I used to explain it this way.
Suppose the protons and electrons are playing a game and the electrons commit a foul that leaves them with 2 men short.
That means there are 2 unguarded plus's around. The result is that the minuses have lost two men who are in the sin bin. (I watch a lot of hockey).
So a +2 means that the electrons have lost two of their players to penalties.
Put in the vocabulary of your question, you give up 2 electrons.
3
Question 6 (2 points)
An increase in the level of carbon dioxide in the atmosphere would result in:
Answer:
Air pollution
Explanation:
Carbon(IV)oxide is sometimes harmful to man but good for plant in other to manufacture their food
Which substance is made up of molecules that can have temporary dipoles?
a. CO2
b. NH3
c. N2
d. H2O
Answer:
Molecules that contain dipoles are called polar molecules and are very abundant in nature. For example, a water molecule (H2O) has a large permanent electric dipole moment.
so it is (D). H2O
Explanation:
Based on the nature of intermolecular forces, the molecule that can have a temporary dipole is nitrogen gas, N2.
What are temporary dipoles?Temporary dipoles are created when electrons revolving around the nucleus, spontaneously come into close proximity resulting in an uneven distribution of electrons, thereby creating a temporary dipole due to unbalanced charges.
Temporary dipoles can initiate weak intermolecular attraction between neighboring molecules such as van der Waal's forces.
Temporary dipoles can occur in non-polar molecules such as nitrogen gas resulting in the ability of nitrogen to be liquefied.
Therefore, the molecule that can have a temporary dipole is nitrogen gas, N2.
Learn more about temporary dipole at: https://brainly.com/question/1454795
Neon is used in lighting advertising displays.
Which statement can be applied to an atom of neon?
A The atom has the same electron arrangement as Cl– ion.
B The atom has two more electrons than an atom of oxygen.
C The atom has the same number of outer electrons as an atom of helium.
D The atom has the same number of electrons as a Ca2+ ion.
Answer:
B. The atom has two more electrons than an atom of oxygen.
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Oxygen has a total number of eight (8) electrons while neon has total number of ten (10) electrons. Therefore, an atom of oxygen is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon with an atomic number of 10.
This ultimately implies that, an [tex] O^{2-} [/tex] atom contains the same number of electrons as an atom of neon.
Hence, a neon atom has two more electrons than an atom of oxygen.
Additionally, Neon is used in lighting advertising displays.
30 points pls i need help
i need the right answer
Answer:
C
Explanation:
yes,
D. It ensures continued existence of the orga
2. Which of the following does NOT belong to the group based on its mode
of reproduction?
A. Butterfly
B. Frog
C. Dog
D. Mosquito
Please help!! I'll name you brainliest!!
Answer:
D. in a covalent bound,electronics are shared.In ionic bounds
electrons are transfered
Explanation:
:) Hope this helps!!
Cobalt(II)chloride is commonly obtained from chemical supply houses as a hydrate with the formula CoCl2.6H2O. An analysis showed that 25.0g of this hydrate contains 11.3g of water. What us the present water by weight in this hydrate?
Answer:
The present water by weight for the hydrate = 45.2%
Explanation:
From the given information;
The present water by weight = (weight of the water/ total weight of the hydrate) × 100
The present water by weight = (11.3/25) × 100%
The present water by weight = 0.452 × 100%
The present water by weight for the hydrate = 45.2%
Explain why lithium fluoride is a solid at room temperature
Help pleaseedeeeeeeeeeeeeeeee
Answer:
the answer to this question here is A
Explanation:
trust me
Answer:
Acid and Salt
Explanation:
Common hydrogen compounds
Hydrogen combines with other elements, forming a number of compounds, including common ones such as water (H2O), ammonia (NH3), methane (CH4), table sugar (C12H22O11), hydrogen peroxide (H2O2) and hydrochloric acid (HCl), according to Jefferson Lab.
23. Which element is most likely to be malleable?
a. Bromine b. Radon c. Nickel d. Carbon
Does this particle diagram represent an element, compound, or mixture?
So What Happens to the Body When We Warm. Up?
Task 2: Fill in the gaps with the words on the next page.
We warm up to...
1. Gradually increase the heart rate and hence the blood flow to the muscles, supplying them
which allows them to work more intensively and efficiently with more elasticity
with
2. Remove waste fluid and waste products from the
cardiovascular system, e.g. helps to avoid a bulld-up of lactic acid
by acceleration of the
3. Increase the depth and rate of
ensuing exercise
required to achieve the appropriate level for
4. Increase the supply of
to the joints. This lubrication increnses the range of
notion in the joints and helps to decrease wear and tear,
5. Increase the body temperature giving increased muscle efficiency and
6. Improve
and dilate lopen up the skin vessels in
order to allow heat loss and body temperature to be maintained at safe levels.
Answer:
Option 1.
Explanation:
When we warm up, our heart rate increases and we require much more energy to continue. Hence, our body absorbs much more oxygen from the surroundings, digest food and etc.
Sorry if the explanation might sound wrong, I learned this during science 2 years ago so I forgot.
Some molecules in air contain .
Explain how atoms from the air can become part of human cells
The atoms in air are combined with oxygen present in the air and when we inhale the air, oxygen is moved into the body then atoms in oxygen are carried by red blood cells the blood is pumped to the lungs and when oxygen is transported to the body organ, the atoms in lungs become the part of human cells.
who is princess tianas best friend, if you can get her name right then ill give you brainliest
Answer:
Oo i think her name is Tiana..... ❤️❤️Answer:
Charlotte La Bouff
Explanation:
"Lottie" if you will
Can someone help me please
(41). Which of the following molecules is (are) polar? For each
polar molecule, indicate the direction of polarity—that is,
which is the negative end, and which is the positive end
of the molecule.
(a) BeCl2
(c) CH3C
(b) HBF,
(d) SO3
Answer:
The oxygen is the negative end of the molecule, while the area between the hydrogen atoms is the positive end of the molecule. Figure 2. Water is a polar molecule, as greater electron density is found around the more electronegative oxygen atom.
Please see the picture, I could really use some help!
Answer:
yo no se de eso preguntale a otro si
WHY LAB SAFETY RULES ARE IMPORTANT?
Answer:
So no one gets injured and schools don't get sued.
Explanation:
If
two open cans of different diameters were left
out in the rain, how would the amount of
water they collected compare? How would the
depth of water in the cans compare?
NEED HELP ASAP!!!
Please choose correctly!!
Will mark brainliest thank you!!!