Answer:
Option B and D seem to be correct
Explanation:
As a scientific law is a statement which is bases on repeated experimental observations that describes some aspects of nature and also they are were theories that have been proven to be true as a theory become a law when the experiment agree with the theory and no contrary opinions so according to my studies , B and D options are seems to be correct.
During active transport, molecules move from areas of ______________ to _______________. This requires the use of _________.
giveaway!! 2 more coming up.
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Answer:
k
Explanation:
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7. At what structures in the lungs do the exchange of oxygen and carbon dioxide take place?
A. Bronchi B. Alveoli C. Bronchioles D. Trachea
LA
Answer:
Answer is Alveoli
Hope it helps.... plz mark as brainliest
There are _____ Chemical families in the periodic table.
Explanation:
18
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.
i really need these answered!!
Explanation:
3)
Equation -
3F₂ (g) + 2AlBr₃ (s) → 3Br₂ (l) + 2AlF₃ ↓
4)
When sulphur dioxide gas reacts with oxygen then it forms sulphur trioxide gas.
Equation -
2SO₂ (g) + O₂ (g) → 2SO₃ (g)
What is the density of a solid that has a mass of 100g and a volume of 25mL.?
Answer:
D = 4 g/mL
General Formulas and Concepts:
Density = Mass over Volume
D = m/VExplanation:
Step 1: Define
m = 100 g
V = 25 mL
D = unknown
Step 2: Find D
Substitute: D = 100 g/25 mLEvaluate: D = 4 g/mLwhich type of bond joins nonmetals atoms to nonmetal atoms
Answer:
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
Explanation:
That's what google said.
Please help on number 6 will mark as brainliest
Answer:
Oil- nonpolar
Sugar- polar
Salt- Polar
Dish soap- It is both polar and nonpolar
Explanation:
a) so they will remain separate from molecules of a polar solvent such as water
b) Sugars are polar due to their -OH groups, and dissolve readily in water by forming many hydrogen bonds.
c)At the molecular level, salt dissolves in water due to electrical charges and due to the fact that both water and salt.
d) Soap molecules have both properties of non-polar and polar at opposite ends of the molecule.
i need to know what word goes into that the words are in each sentence plz help me i will give brainliest thank you :)
Answer:
im taking these points baby lol
Explanation:
i love you <3
Label the liquids from least to most dense, Vegetable oil, water, Dish soap, Corn syrup, Honey
Answer:
1. Vegetable oil
2. Water
3. Dish soap
4. Corn syrup
5. Honey
can someone please give me a very simple definition of nuclear fusion make it as simple as possible
Answer: Nuclear fusion is a nuclear reaction where atomic nuclei of a low atomic number fuse to form a heavier nucleus releasing energy.
Explanation:
Water is added to a test-tube containing dilute NaOH of pH 11. What could be the pH of the resulting solution?
Answer:
NaOH atomic mass is 39.977
pH is 11 due to dilution must be multiplied by 0.11 to find pH
39.977 x 0.11 = 0.43979 x 100%
43% pH
Explain in your own words what the law of conservation of mass means
Answer:
Mass can neither be created nor destroyed in a chemical equation, it transfer from one to another form.
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
Explanation:
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
A teacher attaches two slinky springs to a fixed support. The springs are moved, as shown in the image. Wave A wave B What property of the wave does the teacher change in the movement of each slinky? amplitude,frequency, speed, or wavelength
Answer:
a changes more because it going higher
Explanation:
Answer:
They will be the same because amplitude doesn't affect speed. A physics teacher attaches a slinky to the wall and begins introducing pulses with different wavelength. The denser the medium at the compression, the greater the amplitude of the wav
Explanation:
What do small-scale convection currents create?
A. Solar winds
B. Prevailing winds
C. Global winds
D. Local winds
Answer:
Local Winds
Explanation:
Answer: I think it would be D. Local winds
Explanation: Sorry if I am wrong.
Hope this helps :)
The common charge on an atom in group 17 would be....
+1
+7
-7
-1
+17
ñ How many total electrons does 0-2 (an oxide ion) have?
Explanation:
1one electron and -1 for anions
2 O2- indicates an ion of oxygen having two extra electrons. I.e., since an oxygen atom normally has 8 protons and 8 electrons, this ion has 10 electrons (-10 charge) and 8 protons (+8 charge) giving it a charge of -2 (-10 + 8 = -2).
...
Suppose while walking along the beach, you find a green crystal. Which properties could you use to determine whether the crystal is an emerald?
Explanation:
Emerald is defined by its green color. To be an emerald, a specimen must have a distinctly green color that falls in the range from bluish green to green to slightly yellowish green. To be an emerald, the specimen must also have a rich color.
Scientists find a fossil of a fish on top of a mountain. What kind of evidence does the fossil provide scientists about the way this area might have changed over time?
Group of answer choices
It shows that fish were once able to live without water.
It shows that oceans can change quickly and become land.
It shows that the animals found on the mountain today evolved from fish.
It shows that the mountain may have once been under water and was raised by natural processes
Answer:
It shows that the mountain may have once been under water and was raised by natural processes. Maybe
The fossil provide scientists about the way this area might have changed over time, the evidence It shows that the mountain may have once been underwater and was raised by natural processes.
What is fossil ?Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.
There are four basic categories of fossils, each generated in a unique method and useful for conserving various kinds of animals. These include genuine form fossils, trace fossils, mold fossils, and cast fossils.
Usually, sedimentary rocks include fossils, however rarely, low-grade, fine-grained metamorphic rocks will as well. Sometimes, after the fossils have been removed, the surrounding rock has developed molds.
Thus, option D is correct.
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which of the following actions would cause the volume of the chamber below to increase to 36.0 L?
Answer:
Option C. Triple the number of moles
Explanation:
From the ideal gas equation:
PV = nRT
Where:
P is the pressure
V is the volume
n is the number of mole
R is the gas constant
T is the absolute temperature.
Making V the subject of the above equation, we have:
PV = nRT
Divide both side by P
V = nRT / P
Thus, we can say that the volume (V) is directly proportional to both the number of mole (n) and absolute temperature (T) and inversely proportional to the pressure (P). This implies that and increase in either the number of mole, the absolute temperature and a decrease in the presence will cause the volume to increase.
Thus, the correct option is option C triple the number of moles. This can further be seen as illustrated below:
Initial volume (V1) = 12 L
Initial mole (n1) = 0.5 mole
Final mole (n2) = triple the initial mole = 3 × 0.5 = 1.5 mole
Final volume (V2) =?
From:
V = nRT / P, keeping T and P constant, we have:
V1/n1 = V2/n2
12/0.5 = V2/1.5
24 = V2/1.5
Cross multiply
V2 = 24 × 1.5
V2 = 36 L.
Thus Option C gives the correct answer to the question.
how many electrons does the atom have
Answer:
8
Explanation:
Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
Answer:
3 valence electrons
The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.
Explanation:
Nihonium has to be the #113 element of the periodic table
A. is the correct answer because Boron has 3 electrons too,
All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.
Boron element would have properties most similar to the new element. Therefore, option (A) is correct.
Why do the elements of same group have similar chemical behavior?The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.
The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.
Therefore, both Boron and a new element with atomic number 113 have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.
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The correct name for the molecule 14Cl7 is:
a. triiodide heptachloride
b. lodine chloride
c. tetraiodine heptachloride
d. quadiodine septachloride
Choose the electron configurations which are possible for an unexcited atom. Example 1 – 1s22s22p4 Example 2 – 1s22s22p63s23p33d1 Example 3 – 1s22s22p83s1 Example 4 – 1s22s22p63s1
Answer:
Examples 1, 3 and 4
Explanation:
An unexcited atom is an atom in the ground state i.e the atom has it's valence electrons in it's lowest energy level possible. This actually implies the normal electronic configuration of the atom. Thus, examples 1, 3 and 4 have the actual electronic configuration with there valence electrons in the lowest possible energy level.
Example 1: 1S² 2S² 2P⁴
Example 3: 1S² 2S² 2P⁶ 3S¹ (There seem to be a mistake in the question provided, P energy level can only 6 electrons not 8)
Example 4: 1S² 2S² 2P⁶ 3S¹
NOTE: If you take a look at example 2, it will be deduced that the 3P energy level has only 3 valence electrons and the last valence electron jumped to 3d energy level; making that atom appear to be in it's excited state.
is this a balanced equation?
Answer:
C6 H12 O6 +6 O 2 → 6 CO2 + 6 H2 O
If the half-life of a radioisotope is 250 years how much of a 96.0 gram sample will remain after 750 years
Answer:
12 grams
Explanation:
96g=0 years
48g=250 years
24g=500 years
12g=750 years
write the name of and molecular formula of compound which gives hydrogen ion and chloride ion in the solution state. in which colour is the methyl orange changed after treating it with this compound. why? write the name of salt when the compound is treated with lime water. write the chemical equation.
Which element below would have a 3+ charge as an ion?
Answer:
Al3+
Explanation:
Aluminium has an electronic configuration of 2, 8, 3 and the outermost valence electrons is +3 since it is a metal
Elements acquire positive or negative charges by losing or gaining electrons. The element which have 3+ charge among the options is boron (B) Hence, option B is correct.
What is boron?Boron is 5th element in periodic table and it is classified into 13th group. Boron is a metalloid and shows properties intermediate to metals and non metals.
The electronic configuration of boron is K =2, N =3. Atoms lose or gain electrons as per their valency to become stable. According to octet rule atoms become stable when their valence shell get completely filled.
Boron have 3 electrons in its valence shell. If it donate these three electrons into an electronegative atom, its K shell become its valence shell and it is completely filled. Thus boron becomes stable.]
When atoms loses electrons they acquire positive charge and this charge is numerically equal to the number of electrons lost. Thus boron acquire 3 unit of positive charge by donating its 3 electrons. Hence, option B is correct.
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Your question is incomplete. But your complete question probably was :
Which element below would have a 3+ charge as an ion?
answer choices.
nitrogen (N).
boron (B).
silicon (Si).
argon (Ar)
A sample of water is heated from 60.0 °C to 75.0°C by the addition of 140 j of
heat. What is the mass of the water?
work too pls !!!
Mass of the water : 2.23 g
Furter explanationHeat
Q = m.c.Δt
m= mass, g
c = heat capacity, for water : 4.18 J/g° C.
ΔT = temperature
Q= 140 J
Δt = 75 - 60 = 15
mass of the water :
[tex]\tt m=\dfrac{Q}{c.\Delta T}=\dfrac{140}{4.18\times 15}=2.23~g[/tex]
materials that are eroded from one location are always ?
There are five objects (a pink object, a yellow object, a white object, a gray object, and a violet object). Each object has a different mass (28.7 g, 41.6 g, 8.7 g, 30.4 g, and 76.9 g) and a different volume (11.6 cubic cm, 57.4 cubic cm, 14.9 cubic cm, 29 cubic cm, and 57 cubic cm). The masses and volumes listed above are not in any particular order, they are listed randomly. Use the clues below to figure out the mass, volume, and density of each object. Construct a table to display your data. 1. The volume of the yellow object is not 29 cubic cm and it is also not 57.4 cubic cm. 2. The white object has a greater mass than the pink object. 3. The gray object has a density of 1.349 grams per cubic cm and a mass of 76.9 g. 4. The density of water is 1.0 gram per cubic cm. If the white object was placed in water, it would sink. 5. The density of water is 1.0 gram per cubic cm. If the yellow object was placed in water, it would float. 6. The density of aluminum is 2.7 grams per cubic cm. The violet object is more dense than aluminum. 7. One object has a volume of 57.4 cubic cm and a density of 0.5 grams per cubic cm. 8. The volume of the violet object is not 11.6 cubic