Answer:
Elements within the same group have the same number of electrons in their valence (outermost) shells, and they have similar electron configurations. They exhibit similar chemical properties.
rays with short wavelengths that are the least penetrating, produce chemical effects, and kill germs are
Answer:ultraviolet rays
Explanation:
covalent bond of N and S
Answer:
Covalent bond between identical atoms
Covalent bonds occur between identical atoms or between different atoms whose difference in electronegativity is insufficient to allow transfer of electrons to form ions. ... The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond.
Which item is a good example of potential energy?
A thrown baseball
O Electricity
O A rock
A battery
how do ion-ion bonds, ion-dipole bonds and van der wall forces affect boiling or melting of substances?
guys- my science teacher doesn't teach, he just says go on schoology
Which of the cells is flat and protects you?
Answer:
Skin cells are flat and protect you!
Explanation:
Answer:
Epithelial cells are the safety shields of the body. Take another look at your hand. It is covered with epithelial cells that protect your body by being a barrier between your internal cells and the dirt and microbes in the environment.
What is the molarity of 6 moles (mol) of NaCl dissolved in 2 L of water?
O A.
2 mol
6L
ОВ.
6L
2 mol
O c.
6 mol
2L
O D.
2L
6 mol
Answer:
C: [tex]\frac{6 mol}{2 L}[/tex]
Explanation:
we can use the molarity equation
[tex]M = \frac{mol}{L}[/tex]
so to find M we plug in what we know, which is 6 moles of NaCl and 2 L of water, which gives us:
[tex]\frac{6 mol}{2 L}[/tex]
Answer:6 mol/2L
Explanation:just took the quiz
In making a pizza, which process involves a chemical
change?
o mixing spices for the sauce
o slicing pepperoni for the topping
o spreading cheese on the pizza
o baking the dough to form the crust
Answer:
baking the dough to form the crust
In making a pizza, the process that involves a chemical change is baking the dough to form the crust.
What is chemical change?Chemical changes occur when a substance combines with another to form an entirely new substance.
During a chemical change there is a formation of an entirely new product different from the original product.
Thus, In making a pizza, the process that involves a chemical change is baking the dough to form the crust.
Learn more about chemical change here: https://brainly.com/question/1222323
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Determine the mass of 10g of CaCO3
Answer:
= 100u. Hence 10 g = 0.1 mole. Hope it's helpful to u
Drug addiction occurs in
age groups, from a
variety of backgrounds.
A young, narrow
B. all, narrow
C. all, wide
Answer:
A. young, narrow
Explanation:
Correct me if I am wrong
#LetsStudy
assuming that no heat is lost to the surroundings, what is the final temperature of the mixture?
I need help with this
how many elements belong to the alkali metal family
Answer:
six
Explanation:
check your periodic table
Ethanoic acid is a weak acid because
Is a carboxylic acid
Does not irritate the skin
Is not completely ionized in water
Produces one hydrogen ion per molecule
Answer:
is not completely ionized in water
The ethanoic acid (acetic acid) is considered as a weak acid because it does not releases all of its hydrogen in water, rather it dissociates partially and establishes an equilibrium with its conjugate base.
In a compound, chemical energy is _______________ when bonds break.
Answer:
In a compound, chemical energy is _____required__________ when bonds break.
Which of the following is matter in its solid form?
O Air
O Electricity
O Rock
O Water
Where does the energy of a hurricane come from? (1 point)
O the Sun
O strong winds
O Earth's spin
O Earth's moon
Answer:
strong winds come from the energy of a hurricane
The energy of a hurricane come from strong wind. The Taino Native American term hurricane, which translates to "bad spirit of the wind," is where the word hurricane originates.
What is hurricane ?A tropical storm that has sustained winds of 74 mph or greater is referred regarded as a hurricane. A storm's eye typically measures 20 to 30 miles in width and can reach distances of 400 miles. Storms can be dangerous because of their torrential downpours, strong gusts, and storm surges.
When warm, humid air begins to rise over water, hurricanes emerge. Cooler air replaces the rising air. Large clouds and thunderstorms continue to grow as a result of this process. Thanks to the earth's Coriolis Effect, these thunderstorms are still expanding and starting to rotate.
Thus, option B is correct.
To learn more about hurricane refer the link below;
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whats valency of nitrogen in N2O3, N2O5 and NO
Answer:
Valency of nitrogen in the given compounds:
N₂O₃ = +3
N₂O₅ = +5
NO = +2
-TheUnknownScientist 72
Which one of the following is a measure of the certainty of a
result comparing to a given value or the agreement of
measurements?
a. Accuracy
b. precision
c. Percentage
d. Uncertainty
Answer: a. Accuracy how close is your measurement tot the true value
Explanation:
Which one of the following is a measure of the certainty of a
result comparing to a given value or the agreement of
measurements?
a. Accuracy how close is your measurement tot the true value
b. precision; how close are yourr measurements to each other
c. Percentage: the ratio of tour measurement to the true value X 100
d. Uncertainty: how unsure are you of your measurements
Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) are low molecular weight covalent compounds. Which of the following best describes the state in which these compounds exist at Standard Temperature and Pressure (STP)?
solid
liquid
gas
plasma
Answer:
gas
Explanation:
at Standard Temperature and Pressure Carbon monoxide (CO), carbon dioxide (CO2) and nitrogen dioxide (NO2) exist as gases
Option C is correct
Low molecular weight covalent compoundsCovalent compounds are compounds that are characterized by strong Intra-molecular bonds and they are solids as they have higher molecular weights
But when compounds like Carbon monoxide (CO), carbon dioxide (CO2), and nitrogen dioxide (NO2) are formed with low molecular weight covalent bonds They exist as gases
More on Compound
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The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas
particles?
Answer:
The average kinetic energy increases, and the particles collide more frequently.
Explanation:
The number 1x10^100 is called a googol. Write the number 50 googols in standard form.
Answer:
Explanation:
50 * 10^100 is 50 googols in scientific notation... but
come on, who would write that in standard form...
Why are being flammable and combustible considered to be chemical properties and not physical properties?
A. They alter its mass and volume
B. They change the state of matter
C. They change the substance into another substance
D. They change the color of the substance
Answer:
C. They change the substance into another substance.
Explanation:
Hope it helps!!
could you help answer these two question
Answer:
number 29 is D
Explanation: When the moon orbits the earth some of the light reflects off the moon, making it visible on the Earth.
I dont know how to answer 28 fully, is there a picture?
What fraction of the original atoms of the radioactive sample will remain after the given number of half-lives has passed?
Answer:
1/8
Explanation:
[tex] \frac{1}{ {2}^{3} } = \frac{1}{8} [/tex]
Mark brainliest please
Using the picture below find the density of the irregular object.
Answer:
51.842/2.1 g/mL
Explanation:
the volume of the irregular object= 19.8 - 17.1 =2.7 mL
the density if the irregular object= mass ÷ volume = 51.842 ÷ 2.1 = 51.842/2.1 g/mL
tijuan mixed a solid and a liquid together in a beaker
I need help with this
Answer:
129 units cubed
Explanation:
There are ten spaces between 120 and 130, so we can infer that each line represents a change in volume of 1 unit. The volume of the substance in the graduated cylinder looks like it's 1 under 130, so its volume is 129 units.
Hopefully this was helpful! :)
What is helium an example of?
element
compound
atomic number
subatomic particle
Answer:I believe it is Subatomic Particle.
Heat is transferred from a fire to potatoes that are sitting on top of the coals.
Which type of heat transfer is occurring?
Answer: Is it Conduction?
Explanation:
