in order to perform, a chemist needs an element that has similar properties to potassium (K) but has a lower atomic mass. which element should the chemist select for the experiment?
A. Robidium (Rb)
B. Sodium(Na)
C. Magnesium(Mg)
D. Calcium(Ca)
Answers
The element needed by the chemist to perform the experiment with similar properties to that of potassium, while having lower atomic mass is option B. Sodium.
If we take a look at the periodic table, we can see all the elements that share properties with potassium are located within the same column. Some examples are :
SodiumRubidiumCesium LithiumOf the elements listed, only two are found within the options for this question, which means that we can discard option C and D.
We can then proceed to analyze the atomic mass of each element in an attempt to choose the option with a lower atomic mass than Potassium. Option A, Rubidium, has an atomic mass that is much higher than the 39 of potassium, which means we can discard option A. The correct choice is option B, Sodium , since it shares similar properties and has an atomic mass of 22.
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Related Questions
help please .............
Answers
Answer:
C. Guanine
Explanation:
A pairs together with T, or U in RNA,
and C and G always pair together.
Answer:
The answer is C. Guanine
Explanation:
Pyrimidines always bond with purines. Since Cytosine is a pyrimidine, it must bind with a purine, which can either be Adenine or Guanine. However, Adenine has only 2 places for hydrogen bonding while Guanine has 3. Since Cytosine also has 3, it would bind to Guanine. GCAT is a useful acronym for remembering which binds to which.
Which topic do biologists ask questions about and study using scientific methods?
A)Planets and stars
B)The meaning of existence
C)Living things and the environment
D)The value of science
Answers
Answer:C
Explanation:
Answer: C. Living things and the environment
Explanation: It's correct!
i need help pls question is below
Answers
Answer:
Hey mate......
Explanation:
This is ur answer.....
B. 8 Kilograms
hope it helps,
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I’m sure A is the answer
Best of luck :)
Why are most stray cats short hair cats, but a variety of colors?
Answers
According to the American Humane Society, roughly 95% of all cats are short hair cats (called domestic shorthair). This applies not just to strays but cats that have owners as well. So that fact alone is enough to be able to see why most strays are short hair cats.
Through my research, I'm reading that some people claim that long hair cats are more expensive and rare cats, so the owner is likely to take better care of them and keep them indoors. This further inflates the percentage of stray short hair cats out on the street. I couldn't find much about this from an official source, but instead just through forum posts.
As for the colors, I'm not entirely sure. The cat's fur color comes from its genetics. So it's possible that darker more earth-tone colors help the animal survive better compared to say a lighter color or white fur. Due to natural selection and survival of the fittest, the darker hair color cats will eventually out-number the lighter fur colors. That's my theory anyway. I couldn't find much data or studies to back that up.
Biology
-Calculate the fluid pressure at Piston A.
-Calculate the force exerted on Piston B.
-Which principle is being applied? What does the principle state?
Show all your work!
Answers
Answer:
80N
Explanation:
in both sides, pressure is the alwyays the same whatever the area is..
First we calculate the pressure at piston A:
P= F÷a
given that,
#F= 20N
#a=1m^2
P= 20÷1
P= 20 Pa.
At piston B:
pressure is the same = 20Pa
Area= 4m^2
P=F/a
F= P×a
F= 20 × 4
F= 80N
If you are on the top a mountain and drop an apple, it
will fall to the ground, even though the apple is
gravitationally attracted to you. Why?
a)Earth is larger and has a much stronger
gravitational pull
b) Apples always fall down
C) Centrifugal forces pull the apple to the Earth
and that is stronger than your gravitational pull
d) None of these
Answers
A wildlife biologist and her team counted 150 lizards in a 25 km area. What is the population density
Answers
Given parameters:
Number of lizards = 150 lizards
Area of the study = 25km²
Unknown:
Population density = ?
Solution:
Population density refers to the number of organisms per area in a particular location.
Mathematically;
Population density = [tex]\frac{Total Population}{Area}[/tex]
Population density = [tex]\frac{150}{25}[/tex] = 6lizards/km²
The population density of the study area is 6lizards/km²
What are the 17 crops that California is the sole producer
Answers
Mrs. Cobble has two guinea pigs, one black male and one white female. They 2 white babies
and 5 black babies. Why?
Answers
Answer:Guinea pigs get have of their traits from mom and half from dad. Some traits are recessive some are dominant
11. Which part of a plant cell contains chlorophyll?
Answers
Answer:
Explanation:
chloroplasts
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
The part of a plant cell that contains chlorophyll is the chloroplasts
what dose the MA of 4 mean?
Answers
Answer: The mechanical advantage of a machine is 4. ... ... So MA = 4 means that for example if you apply 100 N then your machine will multiply that force and generate 400 N.
Explanation:
help.. ............. ....m
Answers
Answer:
All the flowers would be the same color. I am basing this under the assumption the capital Y means dominant in your homework. I think its 1:1:1:1 as a ratio
Explanation:
2. Why must the satellite use electromagnetic
waves instead of sound waves?
Answers
Answer:
Since electromagnet waves do not need a medium they can travel through space. Sound waves can't travel through space because they need a medium.
Explanation:
The satellite uses electromagnetic waves instead of sound waves these types of waves do not require any medium for the transmission of the information.
What types of electromagnetic waves are used by Satellites?The types of electromagnetic waves that are used by satellites are known as radio waves. These waves are utilized in order to carry out satellite signals with a speed of 3000,000km/sec.
Electromagnetic waves facilitate the required amount of speed and characteristics which ease the transmission of information required by the satellites. Radio waves are traveling through the vacuum of space with the fastest speed at which the information via the satellite can be transmitted. Radiowaves are also used for spacecraft communications as well.
Therefore, the satellite uses electromagnetic waves instead of sound waves these types of waves do not require any medium for the transmission of the information.
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What gas is CREATED during photosynthesis?
Carbon Monoxide
Carbon Dioxide
o
Water
O Oxygen
Answers
Observe: Click Next. What happens in the cytoplasm?
Answers
Answer:
The cytoplasm is a jelly like substance that supports and suspends organelles and molecules inside the cell. It also helps move and dissolve materials throughout the cell including waste molecules, proteins, and hormones.
I hope this helps! I tried to keep it short and simple. :)
Do cell walls manage the movement of all substances into and out of the cell?
Answers
What’s the complete reaction for photosynthesis
Answers
Answer:
the reaction to carbon dioxide and water to produce sugar, as well as oxygen.
The complete reaction for photosynthesis is:
Carbon Dioxide + Water + Light → Glucose (Sugar) + Oxygen
Which is true about scientific knowledge?
Answers
Answer:
Explanation:
It changes as new evidence is found.
An example is the scientific knowledge of climate change. This scientific knowledge is not agreeable across all the world scientists. However as more and more evidence is collected, over time, the understanding of climate change will change and will either refute or corroborate the earlier understanding.
Which of these is an important part of the scientific process?
A. Observation
B. Nationality
C. Phrenology
D. Religion
Answers
Answer:
A. Observation
Explanation:
To follow the scientific process you must first observe what phenomena you want to study, then you can make a hypothesis. The other options are not part of the scientific process.
Observation is the first step to the scientific process.
Nationality and religion can be a VARIABLE in the experiment, and phrenology is THEORY that has been tested through the scientific process but those answers are not an important part of the process itself.
Hope that helps :)
A cell’s digestive enzymes are enclosed in a membrane-bound organelle. How can these molecules function in the cell?
Answers
Answer:
A fundamental task of proteins is to act as enzymes—catalysts that increase the rate of virtually all the chemical reactions within cells. Although RNAs are capable of catalyzing some reactions, most biological reactions are catalyzed by proteins.
Explanation:
Enzymes perform the critical task of lowering a reaction's activation energy—that is, the amount of energy that must be put in for the reaction to begin. Enzymes work by binding to reactant molecules and holding them in such a way that the chemical bond-breaking and bond-forming processes take place more readily
What are three ways energy is used by the organisms?
Answers
Answer:
Organisms use energy to survive, grow, respond to stimuli, reproduce
Explanation:
Three ways energy is used by the organism are food, nutrients, and sunlight.
What are living organisms?Living organisms are those organisms that grow, adapt, and reproduce their young ones. Organisms need energy for their biological purposes. Organisms get energy from plants and other animals. This energy is used in the form of glucose.
Cellular functions require energy, which living things must obtain from food, nutrition, or sunshine. Energy is used in a cell for the transport, synthesis, and breakdown of nutrients and molecules.
Glucose and ATP are the two types of molecules that organisms primarily use for chemical energy. In the entire biological universe, both molecules are used as fuel.
Therefore, the energy is used by the organisms in three ways that are food, nutrients, and sunlight.
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in the cell, enzymes act as what?
Answers
Answer: A fundamental task of proteins is to act as enzymes—catalysts that increase the rate of virtually all the chemical reactions within cells.
Explanation:i had a project on this
Answer:
Enzymes are a type of protein found within a cell.
Explanation:
Enzymes create chemical reactions in the body. They actually speed up the rate of a chemical reaction to help support life.
How do blood glucose levels increase in the body?
Answers
Which of the following is the best example of evolution occurring? (5 points)
Answers
Answer:
Strains of bacteria can become immune to antibiotics that once killed them effectively
Explanation:
its not in my words
A desert is very hot during the day and receives very little rain. Which
plants have an adaptation that would help them survive?*
Answers
Answer: Well cacti for one
Explanation:
They can store water for a really long time because of the little rain.
Succulent plants have an adaptation that would help them survive in the desert.
Succulent plantsCactus is an example of succulent plants that are adapted to survive in the hot and humid conditions of the desert. To survive in the desert, cactus has the following adaptations:
A modified flat green stem - helps in preparing food by photosynthesis and conserves water.The stem is covered with a thick waxy layer - helps to retain water.Leaves are present in the form of spines - prevent water loss through transpiration.Long roots -very deep into the soil for absorbing water.Learn more about succulent plants:
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Which is the best description of what is making the Earth warmer?
Answers
If a hurricane was to hit Jacksonville during which Moon phase would
we most likely experience the most damage? Describe the factors that
are involved in order to develop an answer.
Answers
Answer:
I think it would be a "Waxing Crescent"
Explanation: I said this because this is the Moon phase that we see almost everyday; if I'm correct.
Let me know if it's right or wrong...
Which events take place in the light-dependent reactions of photosynthesis?
ERRE
O Light energy is converted sugars; sugars are broken down for energy.
O Light energy is captured by plants, light energy is used to make sugar.
O Light energy is converted to chemical energy; chemical energy is used to make sugar.
O Light energy is captured by plants; light energy is converted to chemical energy.
W
Markthina
Answers
Answer:
d
Explanation:
use uterus and vagina in the same sentece
Answers
What would happen if your heart rate did not increase during exercise and describe why
Answers
Answer:
Blood would not pump fast enough to the rest of our bodies.
Explanation: