Answer:
The answer is A. They have 8 electrons in their outer shell (except for Helium).
Explanation: This is because of the number of valence electrons( the amount of electrons in their outer shell). For a reaction to take place, a transfer of electrons must take place. If their outer shell is already full, they don't have any tendencies to react.
Noble gases are unreactive gases and are stable. This is because they have complete octet or eight electrons in their outer shells. Thus, option A is accurate.
What are noble gases?Noble gases are the gases of the periodic table that do not show any reaction with other elements and have great stability and low reaction rates.
They are special as their outermost orbit is completely filled to complete their octet rule so they lack any free electron to take part in a chemical reaction.
Therefore, option A. noble gases have eight electrons in their outermost shell.
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Which human body system creates the force that allows the body to move?
A.
musculoskeletal system
B.
nervous system
C.
respiratory system
D.
circulatory system
Order the following from smallest to largest. Place the smallest value at the top of your list.
0.1km
10cm
10,000mm
1m
According to unit conversion, the values from smallest to largest are 10 cm, 1m,10,000mm,0.1 km.
What is unit conversion?Unit conversion is defined as a multi-step process which involves multiplication or a division operation by a numerical factor.The process of unit conversion requires selection of appropriate number of significant figures and the rounding off procedure.
It involves a conversion factor which is an expression for expressing the relationship between the two units.A conversion ratio always has value which equals to one which indicates that numerator and denominator have values which are expressed in different units.
It is an easy process which involves unit conversion between the different conversion systems. While unit conversion care needs to be taken regarding accuracy and precision.
As 0.1 km=100 m, 10 cm=0.1 m,10,000 mm=10 m and 1 m. Therefore the values from smallest to largest are 10 cm, 1 m,10,000 mm,0.1 km.
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Use the chart to answer the following question. I Nuclear energy does not produce dangerous waste products. Nuclear energy is significantly cheaper then production of energy from fossil II fuels. Nuclear energy does not produce greenhouse gases that contribute to global III warming Nuclear energy generates radioactive waste products that can be safely, IV cheaply, and easily stored, Which statements are claims that are supported by accurate evidence related to nuclear power O A. I, II, and III O B. I, III, and IV O C. II, III, and IV O D. I, II, and IV
Answer:
Nuclear energy is significantly cheaper then production of energy from fossil II fuels
Explanation:
Low-pressure air is associated with which of the following?
a. Cold, Dry, High Density, Good Weather
b. Warm, Moist, Humid, Low Density, Good Weather
c. Cold, Dry, High Density, Bad Weather
d. Warm, Moist, Humid, Low Density, Bad Weather
WILL MARK THE BRAINLEST
Answer:
a. Hh, hh
b. hh
c. 50%
d. 50%
Choose any electromagnetic wave we have discussed and write ONE PARAGRAPH telling me about the uses/benefits of that electromagnetic wave.
Answer:
UV Rays
Here are some points you can add
•used to sterilise equipment from microbacterial organisms
•used to create fluorescence mechanism
•used to purify air
•used to tenderize meat
•can be implemented in medical and dental practices
•water purification
•stimulates vitamin d production
Scientists often repeat experiments multiple times.
Why is this important?
A.
Repeating an experiment helps to verify the results.
B.
Repeating an experiment turns a hypothesis into a theory.
C.
Repeating an experiment gives scientists something to do while they think of new hypotheses.
D.
Repeating an experiment allows scientists to test different variables.
Answer:
The answer is A.
Explanation:
Scientists repeat the same experiments because they wanna try to see if they keep getting the same result. When a scientific investigation is repeated, this is called replication. Replication is important in science so scientists can “check their work.” The result of an experiment is not likely to be well accepted unless the investigation is repeated many times and the same result is always obtained.
Stars in the sky appear to be moving. What do we call this conclusion that is based on observations, clues, or evidence?(2 points)
A.Hypothesis
B.Inference
C.Procedure
D.Report
Answer:
B. Inference
Explanation:
I dont have one but when i took a quiz it said it was right
Stars in the sky appear to be moving. We call this conclusion that is based on observations, clues, or evidence is Inference.
What is inference?An inference is a conclusion that we can make when we have seen evidences of some particular situations and according to that we give statements.
For example-
1. If someone made a bad face just after taking a bite of food then we can infer that the person didn't like the food.
2. If someone is going away from a place after another person arrived then we can infer that the first person doesn't like the second person.
3. If someone is very lazy from the beginning of the day then we can infer that the person didn't take proper rest.
Given options are-
A. Hypothesis
B. Inference
C. Procedure
D. Report
Therefore, Stars in the sky appear to be moving. We call this conclusion that is based on observations, clues, or evidence is Inference.
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Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred that produced zinc chloride (ZnCl2) and 6 g of hydrogen gas (H2).
Zn+ 2HCl → ZnCl2+H2
What is the mass of the zinc chloride?
Answer: 11 g
Explanation:
Zn + 2HCl → ZnCl₂ + H₂
Number of moles of Zn:
Number of moles = 5 g / 65.38 g/mol
Number of moles = 0.08 mol
Number of moles of HCl :
Number of moles = 50 g / 36.5 g/mol
Number of moles = 1.4 mol
Compare the moles of both reactant with zinc chloride:
Zn : ZnCl₂
1 : 1
0.08 : 0.08
HCl : ZnCl₂
2 : 1
1.4 : 1/2×1.4 =0.7 mol
The number of moles of zinc chloride produced by Zn are less so it will limit reactants.
Mass of zinc chloride:
Mass = 0.08 mol × 136.3 g/mol
Mass = 11 g
Please help urgent !!! How does an instant cold pack get cold so quickly?
Answer:
When the inner bag of water is broken by squeezing the package, it dissolves the solid in an endothermic reaction. This reaction absorbs heat from the surroundings, quickly lowering the pack's temperature.
Explanation:
Uh, yea.
Have a good day!
question #5: corals are sensitive to temperature . if temperatures are raised , it will cause the coral to bleach . what does bleach mean ? And can corals recover ?
Answer:
It means the coral will turn white and corals may recover (depending on the species) by soaking up ocean surface heat.
please help!
a b c or d
Answer:
A glass pane / A.
Explanation:
Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air. The division of materials into the categories of conductors and insulators is a somewhat artificial division.
Answer:
the answer is A
Explanation:
plz helppppppppp meeeeeeeeeeeeeeee
4. Obsidian - rapid cooling when lava flows into water.
Granite - very slow cooling such as what occurs when magma is trapped beneath Earth's surface.
Basalt - cooling when lava flows over land
5. They are slightly simplistic and rock formation is not limited to only these methods.
6. They give a general overview of how a certain type of rock may be formed and how to identify them from a basic level based on their location.