Answer:
Niels Bohr
Explanation:
Phosphorus-32 has a half-life of 14.3 years. How many grams remain after 57.2 years if you have
4.0 g of the isotope at the beginning?
Answer:
29.3 years to live
Explanation:
Phosephurus loses 32 years at his life -32
then he gains 14.3 years back and another 57.2 years
totaling 29.3 years he will live
How long should you monitor a person who shows signs of a mild allergic reaction
Answer:
Most reactions occur quickly after ingestion or contact with the allergen, but some can occur up to a few hours later. There can also be a second phase of the reaction when symptoms reoccur. It is important to keep an eye on your child for about 6-8 hours following the first reaction.
Explanation:
the variable part of an amino acid is the __________.
answer: the variable part of an amino acid is the: SIDE CHAIN
(WILL GIVE BRAINLESS)Throwing a paper airplane through the air is an example of A. fluid friction B. sliding friction C. rolling friction D. solid friction
Answer:
sliding friction
Explanation:
Answer:
D. solid friction
Explanation:
Its not a fluid, Its not sliding, and its not rolling, so therefor is solid friction
Helium is classified as a(n)?
O alkaline earth metal
O alkali metal
O transition metal
O noble gas
Answer:
NOBLE GAS
Explanation:
Look At The Table Of Elements
Which group on the Periodic Table has elements that would easily combine with elements from Group 1 (which have one valence electron) because they have 7 valence electrons?
Answer:The halogens in Group 17
Explanation: The halogens in Group 17 all have 7 valence electrons. They will steal anuy electrons they can to form a full outer shell.
Give an example of a type of cookie that is a heterogeneous mixture, and a type of cookie that is a homogeneous mixture. Explain your reasoning.
plz answer
Particle A has very little mass in comparison to Particle B. Both particles are in the same atom. Which is the best conclusion about Particles A and B?
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Answer:
A) They have the same charge.
B) They are located in the nucleus together.
C) Particle A has a positive charge, and Particle B is neutral.
D) Particle A orbits the nucleus, and Particle B is located in the nucleus.
Explanation:
15). A covalent chemical bond is one in which A) electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged. B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms. C) outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms. D) outer-shell electrons of one atom are transferred to the inner electron shells of another atom. E) the inner-shell electrons of one atom are transferred to the outer shell of another atom.
Answer:
B) protons and neutrons are shared by two atoms so as to satisfy the requirements of both atoms
Help me pls I will mark you as brain
why is it important to use deionized water in an experiment
because it removes all of the charged ions in the water, making it safe to mix into medications
How many valence electrons in this electron configuration 1S2 2S2 2P6 3S2
Answer:
Explanation:
Electron Configurations
A B
Fluorine 1s2 2s2 2p5
Neon 1s2 2s2 2p6
Sodium 1s2 2s2 2p6 3s1
Magnesium 1s2 2s2 2p6 3s2
Do gasses have a fixed volume
Answer:
No
Explanation: Gases have no fixed volume and no fixed shape. Gases expand to fill the space available. They can also be compressed into a very small space.
Which is an example of chemical weathering?
7th grade Sem 1
13.2.6 Quiz: Chemistry of Life
Question 3 of 5
Which substance used during photosynthesis does a plant take in from the
soll?
A. Water
O
B. Sugars
C. Proteins
D. Oxygen
SUBMIT
Answer: Water
Explanation: During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil
Carbon burns with oxygen to produce carbon dioxide gas.
Which of these shows the correct chemical reaction?
O C+0=CO2
O CO, CO2
C +02 + CO2
CO2 = C+0
Answer:
it will help you , but I am not sure it is correct
phenolphthalein is used as a visual indicator in a strong acid-strong base titration because
The pH range of phenolphthalein is 8.3 - 10.0, which is suitable with the pH range of Strong Acid and Strong base titration and so phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
What is an Indicator ?Any substance that gives a clear visible indication of the presence or absence of a particular concentration of a chemical species, such as an acid or an alkali in a solution, usually by a colour change.
The pH range of Strong Acid and Strong base titration is 3–11 and equivalent point is at 7
the pH range of Strong Acid and Weak base titration, is 3–8 and equivalent point is below 7
the pH range of Weak Acid and Strong base titration, is 6 - 11 and equivalent point is above 7
So for titration , an indicator with suitable pH range is used
The pH range of phenolphthalein is 8.3 - 10.0.
Therefore phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
To know more about Indicator
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What type of front is depicted here? (60 Points)
Cold
warm
stationary
Occluded
Answer:
warm
Explanation:
how can you tell the number covalent bonds the atoms of an element can form?
which of the beryllium halides are considered ionic compounds?
Answer:
Beryllium Fluoride (BeF2) is an ionic compound
SUPER EASY. just check if i'm right or not. WILL GIVE BRAINLIEST
Answer:
what is the question
Explanation:
Answer:
Um what do u want us to check?
Explanation:
What volume of water has a mass of 1 kg?
Answer:
the value of water is 1000
Help me pls I will mark you as brain
Answer:
I,II and III
Explanation:
Hope this helps :)
Answer:
l and III is the answer.
hope it hepls
Calculate the volume of a clear liquid that has a mass of 20 g and a density of 15.77 g/mL.
Answer:
20 g g/mL. 15.77
Explanation:
i think i answer it
I need the anwer plz helppp this question is worth 25 point
Explanation:
Enzyme X works on sugar C substrate.
answer false or true for each question, (1-5). thanks!
when using vacuum filtration which type of tubing is best?
Answer:
The filter flask and the vacuum trap consist of heavy-walled glassware. You should use thick-walled tubings as well. Normal tubing that you use as water hoses will collapse under vacuum.
For vacuum filtration, thick walled tubings are best as they can withstand the pressure which is applied during filtration.
What is vacuum filtration?It is a filtration technique which works faster .This is because water is suck out the air in the vacuum flask and Buchner funnel by flowing it through the aspirator.
Filter at the bottom separates the solids from the liquids.Solid residue at top of funnel can be easily dried. The filtration takes place effeciently in presence of vacuum .
There is a rubber conical seal which ensures that the apparatus is hermetically closed,maintains vacuum in apparatus and avoids physical points of stresses.
Vacuum filtration is faster than gravity filtration and is more efficient leading to purer liquid. It is of much importance in crystallization.
Learn more about vacuum filtration,here:
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Can someone find from which website this test is?
Answer:
Try quizlet, they have everything on there
Explanation:
Potential Energy vs Height
This graph shows the relationship between the height of
an object and the object's gravitational potential energy
Potential Energy vs Mass
This graph shows the relationship between the most
an object and the object's gravitational al energy
100
100
80
80
60
60
Potential energy (J)
Potential energy (J)
40
40
20
20
04
0
0
0
20
80
100
20
80
100
40 60
Height (m)
40 60
Mass (kg)
21. Look at the graphs of gravitational potential energy, height, and mass. Based on
these graphs, write an argument on whether height or mass has a greater effect on
gravitational potential energy
cos
Answer:
1
2
3
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5
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100
Explanation:
What happens when water reaches its boiling point?
Answer:
khi sôi nhiệt độ của nước đạt 100oC, đến lúc này một phần nước sôi sẽ biến thành hơi nước, hơi nước sẽ đùn lên phá vỡ mặt nước và bốc hơi vào không khí, hình thành lên hiện tượng sôi của nước. Nước sôi đánh dấu mốc chuyển đổi trạng thái từ nước (thể lỏng) sang hơi nước (thể khí).
Explanation:
