Answers
ANSWER : I AND III
HOPE IT HELPED
Related Questions
What volume will 75 g of O2 occupy at STP?
Answers
p = latm
t = 273.15K
R= 0.08206 L atm mol K
75.0g02
16.00 (O₂) = 4.6875mol mol
9
Ideal gas law: PV = nRT, solve for volume: V = nRT P
V =
4.6875mol 0.08206 L-atm mol. K · 273.15K
V = 105L
latm
2. If Ben ran for 15 minutes and went 120 meters, how fast did he run?
Answers
Answer:
8m/min
Explanation:
120 m / 15 min = 8 meters per min
120 m / 15 m = 8
A fictitious element X is composed of 10.0 percent of the isotope 55 X, 20.0 percent of the
isotope 56 X, and 70.0 percent of the isotope 57 X. Estimate the atomic mass of element X.
Answers
Answer:
56.6 g/mol.
Explanation:
Assuming here that we have 100 atoms of each element. The percentage tells us that we have 10 atoms of the 55 isotope, 20 of the 56, and 70 of the 57.
So the total is 10*55 + 20*56 + 70*57 = 5,660. And to get the average, we just divide by the total number of atoms (100).
Atomic mass = 5660/100 = 56.6
how many molecules of water, h2o, are present in 75.0 g of h2o?
Answers
Answer:
150 molecules of oxygen
Explanation:
What forms a weak acid?
(Hint: Carbonation)
A) carbon dioxide/iron
B) carbon dioxide/water
C) carbon dioxide/materials
D) Oxygen/rust
Answers
(ii)
Copper and potassium have different melting points and boiling points.
Give one other difference between the properties of copper and potassium.
Answers
Answer:
ExplanationWhat are the properties of potassium?
Image result for give one other difference between the properties of copper and potassium
Potassium metal is soft and white with a silvery lustre, has a low melting point, and is a good conductor of heat and electricity. Potassium imparts a lavender colour to a flame, and its vapour is green. It is the seventh most abundant element in Earth's crust, constituting 2.6 percent of its mass.:
Difference between copper and potassium is the valence electron of sodium is in the 3s orbital whereas the valence electron of potassium is in the 4s orbital.
What are the properties of potassium?Potassium metal is soft and white with a silvery luster, has a low melting point, and is a good conductor of heat and electricity.
What are the properties of copper?It is malleable, ductile, and an extremely good conductor of both heat and electricity. It is softer than zinc and can be polished to a bright finish.
Learn more about the copper and potassium here: brainly.com/question/15987580
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pleaseeeeee helpppp???????
Answers
Answer:
Aluminum is highly reactive
Explanation:
Chemical property is defined as the property in which chemical composition of the substance changes.
For example, reactivity, oxidation state, inflammability etc are all chemical properties.
Therefore, we can conclude that out of the given options, Aluminum is highly reactive depict a chemical property of aluminum.
Water quality tests show the presence of a single heavy metal in the drinking water pulled from a local river. Residents are suffering from numerous stomach ailments and are showing signs of long-term kidney damage. The residents of the next town, down river from the first town, seem to be unaffected. Water quality tests in the river by the second town show two types of heavy metals at acceptable legal limits in the water. One of the metals is the same as the one in the first town. What can scientists infer about the possible reason for the illnesses appearing in the first town but not the second?
One metal causes an acute effect, compared to the other.
One metal causes a chronic effect, compared to the other.
The heavy metals have a synergistic relationship when combined.
The heavy metals have an antagonistic relationship when combined.
Answers
Answer:
One metal causes a chronic effect, compared to the other
Explanation:
because the question only said ONE is the same, didn't they? so that would mean that not all the metals are the same for both towns
Give an example of one pro and one con for the use of stem cells in medicine.
Answers
Answer:
pro ca help defeat diseases, con the stem cell might cause harm
Explanation:
The stem cells are used in regenerative medicine to reproduce the body organs and replace the damaged orangs. The disadvantage of stem cells is that it is difficult to culture the stem cells, and they can be transformed into cancerous cells.
What are stem cells?Embryonic stem cells can be described as pluripotent stem cells derived from the inner cell mass of a blastocyst. Human embryos can reach the blastocyst stage 4 to 5 days post fertilization, at which time they contain 50 to 150 cells.
Isolating the inner cell mass using immunosurgery results in the destruction of the blastocyst, a process that raises ethical issues, at the pre-implantation stage have the same moral considerations as embryos in the post-implantation stage of development.
Potential uses of stem cells include the treatment of diabetes and heart disease. The cells are being analyzed or studied to be used in clinical therapies, genetic disorders, and cellular/DNA repair. However, adverse effects in the research processes and clinical processes such as tumors and unwanted responses have been reported.
Learn more about stem cells, here:
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(02.01 MC)
Observe the image. What observable property can be used to separate a mixture of sand and rice using this tool? (2 points)
Public Domain
Oa
Color
Ob
Magnetic attraction
oc
Particle size
Od
Texture
8.69 Mostly cl
Answers
Answer:
C. Particle size
Explanation:
The sand, which has smaller particles, will go through the sieve, while the rice (with a larger particle size) will not
Why are plastics known as synthetic materials?
Answers
Answer:
It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible.
Explanation:
Synthetic polymers are made up of long chains of atoms, arranged in repeating units, often much longer than those found in nature. It is the length of these chains, and the patterns in which they are arrayed, that make polymers strong, lightweight, and flexible. In other words, it's what makes them so plastic.
LL < 5 6 7 8 9 10 11 7 12 How many atoms are in O2? O 1 O2 3 4
Answers
Answer:
2
Explanation:
hehehhdhshdhebndhdurjenndjdjebdnd
Which of the following elements has only one electron in its outermost s orbital?
A. F
B. Al
C.Mg
D.Na
Answers
Answer:
D: Na
Explanation:
Hope this helps!
Have a nice day!!
:D
what is the polystyrene?
Answers
Answer:
Polystyrene is a versatile plastic used to make a wide variety of consumer products.
Explanation:
Answer:
polystyrene, a hard, stiff, brilliantly transparent synthetic resin produced by the polymerization of styrene. Styrene is obtained by reacting ethylene with benzene in the presence of aluminum chloride to yield ethylbenzene.
Explanation:
in other words its a plastic
polonium has a large, unstable nucleus. through which process is it most likely to become stable?
Answers
Answer:
alpha decay
Explanation:
an unstable element is radioactive in nature.
Polonium is a chemical element with a large, unstable nucleus.
the most stable isotope of Polonium is Polonium-209, which typically undergoes an alpha decay to form lead-205 and the emission of an alpha particle.
1. Polonium has a large, unstable nucleus. Through which process is it most likely to become stable?
alpha decay
2. Which type of energy does alpha decay generate?
kinetic
3. Use the equation to answer the question.
14 6C→14 7N+ 0−1e
Which type of radioactive decay does the equation model?
beta-minus decay
4. How does the nucleus change in beta-plus decay?
The mass number remains the same, and the atomic number decreases by one
5. An unstable nucleus undergoes gamma decay. How does the nucleus change?
It becomes more stable by repositioning its particles
Explanation: I did the test
what term is used to describe alkaline hydrolysis of fats and oils
Answers
Answer:
Saponification
Explanation:
When treated with a base such as NaOH, the ester is transformed back to alcohol and the sodium salt of carboxylic acid. Saponification is the name given to the reaction since it is utilized in the production of soap.
What happens in the following cases. [ ( write two eg for each also write is there any ex
change of energy ) ] i) when an element combine with another element. ii) When an element combine with a compound. iii) When a compound combine with another compound.
Answers
mjhhhhhhhhhhmmmmnnñbb
Question 8 (2 points)
(02.02 LC)
A mixture contains nuts, drink mix, orange slices, and berries. Which part of this mixture is soluble in water? (2 points)
а
Berries
Ob
Drink mix
Ос
Nuts
Od
Orange slices
Question 9 (2 points)
(02.02 LC)
which of the following dissolve in water? (2 points)
Answers
Answer:
B. Drink Mix
Explanation:
Assuming the drink mix is something like Kool-aid, it is soluble in water. The rest are solids that cannot be dissolved in water.
All mater has ___ and takes up ___
Answers
Matter is anything that has mass and takes up space.
hope this helps <3
what is the wavelength of an X-ray having a frequency of 4.80 x 1017 Hz
Answers
Answer:
Refer to the attachment
Migration can best enhance the survival of individuals because it
Answers
Answer:
It can enhance survival because the animals for example birds are migrating to those places for high or increasing resources
Explanation:
does the character of a bond become more covalent or ionic when the difference in electronegativity of the bonded atoms increases?
Answers
Answer:
The grater the difference in electronegativity, the more ionic the bond
o Neutralization reactions are a type of__________
reactions.
• The removal of hydrogen ions and hydroxide ions from solution as they form________
causes the pH of the mixture to_________.
If the right amounts of acid and base react, the
resulting solution will be________
Answers
Answer:
nala
simba
Explanation:
how many atoms of neon are present in 1.30 moles of neon?
Answers
Answer:
7.83 x 10^23 atoms
Explanation:
Electrons are transferred from one atom to another.
Options:
Ionic Bond or Covalent Bond?
Answers
Answer:
ionic
Explanation:
ionic transfer of e^- ions formed (charges)
ionic=non-metal+ metal
ex: F+Ca
covalent sharing e^- no true charges
covalent= non-metal+ non-metal
ex: F+P
( my notes)
mixing agno3 and nacl will produce what white precipitate.
Answers
use of chemical substance in our daily life their advantages and disadvantages
Answers
Answer:
Explanation:
By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
For the following element, predict the most likely oxidation number (charge) for its corresponding ion.
Phosphorus
A. P+1
B. P+3
C. P-1
D. P-3
Answers
The most likely ion of Phosphorous is P³⁻ (group 15) since gaining three electrons is the most energetically favorable way for it to follow the octet rule.
Because the charge on ions is equivalent to their oxidation state, then -3 is the most likely oxidation number of Phosphorous.
The energy an object has due to its movement or position is called
Answers
Answer:
Potential energy
Explanation:
When an object is moving its called Potential energy.
When an object is not moving it is called kinetic energy.
Someone pls help me I will make you brain