HELP ME AGAIN FOR BRAINLIEST
Answer:
1: C
2: a
3: B
4: D
hope this helps
1. Lithium, water, edible salt, chalk, Carbon, Lime, Nitrogen, Potassium, Oxygen,
Iodides, Iron, Chlorine, etc are some matters.
(a) Expressing the matters of the stem by symbol and formula separate the elements
and compounds. ---3 marks
Answer:
Explanation:
An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms (and there corresponding symbols) mentioned in the question are
Lithium ⇒ Li
Carbon ⇒ C
Nitrogen ⇒ N
Potassium ⇒ K
Oxygen ⇒ O
Iron ⇒ Fe
Chlorine ⇒ Cl
A compound is substance that contains two or more atoms that are chemically combined and can be represented with a chemical formula. The compounds (and there corresponding formula) mentioned in the question are
Water ⇒ H₂O
Edible salt (sodium chloride) ⇒ NaCl
Chalk (calcium carbonate) ⇒ CaCO₃
Lime (calcium oxide) ⇒ CaO
Iodides (such as sodium iodide and potassium iodide) ⇒ NaI and KI respectively
What would happen to the air pressure on Earth's surface if the density of Earth's atmosphere were to suddenly double?A. The air pressure would decrease by half. B. The air pressure would increase 2X. C. The air pressure would stay the same. D. The air pressure would increase 4X.
Answer:
B. The air pressure would increase 2X
Explanation:
Pressure = density × acceleration due to gravity × height
p = ρ × g × h
Pressure is force per unit area
p = F/a
Density is mass per unit volume
Pressure is directly proportional to density hence, any change in the density of a body directly affects the change in pressure of the body and vice versa.
relative atomic mass of sulphuric acid
how many kilograms are in 125 pounds
Answer:
125 pounds = 56.6990463 kilograms
Explanation:
Mixed Naming Worksheet – Ionic, Covalent and Acids
Directions: Be sure to determine what type of compound your substance is – ionic, binary, covalent or an acid. Naming Compounds
1. NO2 - Covalent
2. NaBr - Ionic
3. SiO2 -
4. P2Br4
5. FeSO4
6. SF6
7. HNO3
8. Li2S
9. HCl
10. MgBr2
URGENT!
A series of experiments are conducted with five different cups, each filled with the same amount of water. One cup is kept at room temperature (25 °C), while the other four cups are heated to four different temperatures. Sugar is added to each cup until no more will dissolve. The amount of sugar added to each cup is recorded. Which answer correctly identifies the control group, independent variable, dependent variable, and controlled variable in the experiment?
Control Group: temperature of the water Independent Variable: cup of water at room temperature Dependent Variable: amount of sugar dissolved Controlled Variable: amount of water in each cup
Control Group: temperature of the water Independent Variable: cup of water at room temperature Dependent Variable: amount of water in each cup Controlled Variable: amount of sugar dissolved
Control Group: cup of water at room temperature Independent Variable: temperature of the water Dependent Variable: amount of sugar dissolved Controlled Variable: amount of water in each cup
Control Group: temperature of the water Independent Variable: amount of sugar dissolved Dependent Variable: amount of water in each cup Controlled Variable: cup of water at room temperature
Answer:
Either the first one or the third one.
Explanation:
Using process of elimination: knowing that the controlled variable is something the conductor is able to control and stays the same throughout; the amount of water is the same, but it also states that temperature is not the same throughout. This cancels out B because the amount of sugar dissolved varies and doesn’t stay the same. D fits the same criteria as well.
so now we are left with A and C.
An independent variable is something that can be by itself and doesn’t depend on anything else. Sugar is NOT independent, as it dissolves DEPENDING on the amount of liquid. So we can already rule out that sugar is a dependent variable. Both A and C have those choices though, so now we are with the control group and the independent variable.
Think about it, which is the independent variable? Water amount doesn’t depend on anything, while the temperature depends on the room. So the answer is most likely A.
Hope this helps, don’t stress about homework. Happy Holidays!
Elerium would have 25 protons, 30 neutrons and 24 electrons. What would its mass number be?
Answer:
55
Explanation:
mass number=protons+neutrons
=25+30
=55
Element ______ has 2 valence electrons and is in period 4.
Answer:
Calcium
2.8.8.2
last energy she'll got 2 electrons
as 2 valency
Why do you think the size of a white dwarf affects its visual luminosity?
Reward
_________
Brainliest
Thanks
Points
_________
Thank you so much!
Answer:
the bigger the size the more easier to see from a distance and the smaller the harder to see.
Explanation:
If 0.213 moles of argon occupies a volume of 652 mL at a particular temp and pressure, what volume would it occupy if 0.162 moles of argon were added at the same conditions?
Answer:
V₂ = 495.89 mL
Explanation:
Given data:
Initial number of moles = 0.213 mol
Initial volume = 652 mL
Final number of moles = 0.162 mol
Final volume = ?
Solution:
V₁/n₁ = V₂/n₂
By putting values,
652 mL/0.213 mol = V₂ /0.162 mol
V₂ = 652 mL 0.162 mol /0.213 mol
V₂ = 105.62 mL.mol /0.213 mol
V₂ = 495.89 mL
what phase change requires a substance to absorb energy?
Which biome has lost 95-99% of its natural habitat due to farming and ranching?
Grassland biome has lost 95-99% of its natural habitat due to farming and ranching.
What is Grassland biome?
This biome comprises of a lot of open area of grasses and is usually cleared for agricultural activities.
Animals also use it for grazing and ranching purposes which is why it has lost 95-99% of its natural habitat.
Read more about Grassland biome here https://brainly.com/question/12604224
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Which of the following represents a molecule
A Ca
B Co
C CO
D Cu
Answer:
C. CO
Explanation:
A molecule is a substance that is a combination of two or more atoms through a chemical bond while an element is a substance containing only one type of atom. However, some elements are also considered molecules because of having diatoms such as: Hydrogen, Oxygen, Chlorine, Bromine, Fluorine, Nitrogen and Iodine.
Among the choices above, it is only choice C (Carbon monoxide) that is a molecule. All the other options (Calcium, Cobalt and Copper) are elements. Carbon monoxide is a combination of one atom of carbon and another atom of oxygen.
The option that represents a molecule would be CO. That is option C.
What is a molecule?A molecule is defined as the substance that is made up of two or more elements that are chemically combined together.
From the options give above, CO which is carbon monoxide is diatomic. This shows that it contains two elements making it a molecule.
Learn more about molecules here;
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A student measures the sides of a piece of paper to determine the area of the paper. His measurements are: 5.70 cm length and 10.22 cm width. What is the area of the paper (recorded to the correct number of significant figures)?
Answer:
58.3 cm
Explanation:
took the quiz.
Describe the movement of the asthenosphere
I am giving 62 points to first person to answer
Answer:
Explanation:
Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.
Cleaning solutions work faster if it is used straight from bottle rather
than adding water to the solution why?
Answer:
adding water would make the solution less concentrated. Hope this helps :)
Explanation:
The solution would become less concentrated if water was added.
What is solution?A solution is just a uniformly dispersed mixture with one or maybe more solutes in a solvent. solvent.
What is concentrated?
The number of particles existing in a combination is expressed by the concentration of such a chemical substance.
When suitably diluted, this solution will have to be efficient at killing microorganisms. How or when to Sanitize using bleach in a safe way.
To know more about concentration and solution.
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what is the number of sigma and pi bond in butanol?
Answer:
Sigma Bonds = 14
Pi bonds = 0
Explanation:
Butanol:
[tex]\sf CH_{3} -CH_{2}-CH_{2}-CH_{2}-OH[/tex]
There is no pi bond in this compound (since there is no double or triply bond)
So,
Pi bond = 0
Now, Coming towards sigma bonds
Sigma bonds = 3 (First carbon with hydrogen) + 2 (Second C with H) + 2 (Third C with H) + 2 (Fourth C with H) + 1 (Bond of O and H) + 4 (Bonds between C and C and C and O)
Sigma Bonds = 14
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807The diagram shows what happens when oceanic crust runs into continental crust. What process is being shown in the diagram?
A.
B.
C.
D.
Answer:
B. subduction
Answer:
the contenental crust was b gone beacause of water that fill in the land also the volcano in the under of water will increase
Why is a reaction between Sodium and Potassium impossible?
Answer:
it is because a number of factors, including sample surface cleanliness and temperature, can prevent chunks of alkali metals from exploding on contact with water. The team eliminated those variables and others by using a sodium-potassium alloy that remains liquid at room temperature and a droplet delivery system featuring a calibrated syringe.
Answer: Potassium has a chloride mixture which makes it so sodium interacts easily with it to form the bond
What is the electrical charge on the nucleus of a carbon-12 atom
Answer:
Neutral carbon-12 (or any carbon atom) has 6 electrons with a total negative charge of 6e- orbiting a nucleus with a total positive charge of 6e+, so that the total net charge is zero. The nucleus is made up of 6 protons, each with a positive charge of e+, and 6 neutrons, each with zero charge.
Explanation:
Answer:
Neutral Carbon-12 Atom
Assignment Summary For this assignment, you will make a scale model—a “core sample”—showing the layers of the Earth: crust, lithosphere, asthenosphere, mantle, outer core, and inner core. Background Information The Earth is composed of six layers with differing thicknesses and properties. The crust forms both land and seafloor. It is thickest under mountains and thinnest under ocean beds. The crust’s thickness ranges from 5 to 70 km thick. The lithosphere consists of the crust plus the upper mantle. It is solid and is about 100 km thick. The asthenosphere is a semisolid layer under the lithosphere. It is about 180 km thick. The lower mantle is 2,250 km thick and is solid, but very hot, rock. The outer core is molten rock and it is 2,266 km thick. Finally, the inner core is 1,210 km thick, and it is solid iron and nickel. Remember that as you go deeper into Earth’s layers, temperature and pressure increase. A core sample is made by drilling into the Earth and pulling out a long cylinder of rock. Geologists analyze these core samples to learn more about Earth’s history and composition. So far, geologists have not yet succeeded in drilling into Earth’s mantle. You will construct a scale model of a core sample. When something is “to scale,” it has a uniform reduction or enlargement. You will calculate how deep each layer should be in centimeters, based on the actual depth of Earth’s layers in kilometers. The percentage of the total for each layer remains the same, but the actual number of units changes.Step 5: Create a typewritten paper describing your model of Earth’s layers. a) Type several paragraphs describing your “core sample” of Earth’s layers in detail. i. Explain what a core sample is. Then, tell whether it is currently possible to take a core sample like the model you’ve created. ii. Compare and contrast the layers in your model, including the significance of the colors. iii. Discuss what it means to create a scale model. iv. Include a table with the values you determined for each layer. v. Discuss the relationships of each layer to the others, including depth. b) Answer the following question in a separate paragraph. i. How does your “core sample” model of Earth’s layers differ from the actual layers of the Earth? c) Make sure your paragraphs include correct sentence structure, punctuation, grammar, and spelling. d) Ask your teacher where you should save your work. Your teacher may also have specific guidelines about the file name you should use.
Answer:
yo I hope this gets you a good grade. I have the same thing due on Nov. 9. did it the same day it was due. good luck. you will need to make the thing yourself.
Explanation:
A core sample is a cylindrical section of a natural substance. Most core samples are made by drilling with special drills into the substance, such as sediments or rock, with a hollow steel tube, called a core drill. The hole made for the core sample is called the "core hole". It is currently not possible to take a core sample like this one.
The difference in these layers is that the farther down you go the hotter and more dense it gets. You need to make the layers different colors so you know which layer is which and, how deep the layer goes.
What it means to make a scale model is to make a model of something and make it a certain amount smaller than the original.(the entire model should be the same amount smaller than the original.)
Starting at the center, Earth has four different layers. They are, from deepest to shallowest, the inner core, the outer core, the mantle and the crust. Except for the crust, no one has ever explored these layers in person. The inner core is a solid metal ball and is extremely dense, it’s made mostly of iron and nickel.the outer core is also made from iron and nickel, just in liquid form. The mantle is Earth’s thickest layer and is made mostly of iron, magnesium and silicon, it is dense, hot and semi-solid (like caramel candy).Earth’s crust is like the shell of a hard-boiled egg. It is extremely thin and cold. The crust is made of relatively light elements, especially silica, aluminum and oxygen.
How does this “core sample” model of Earth’s layers differ from the actual layers of the Earth? Well, this model is much smaller and is Impossible to do in real life. Example, the metal used for making the hollow rods to take these core samples would melt when they get to the mantle much less the inner core.
A student mixes a solution of lead (II) nitrate with a solution of potassium iodide and notices the formation of a yellow solid. What is the precipitate? How do you know?
Answer:
Lead (II) iodide
Explanation:
The reaction of lead (II) nitrate, Pb(NO₃)₂ with KI is:
Pb(NO₃)₂(aq) + 2KI(aq) → KNO₃(aq) + PbI₂(s)
This is a typical double-replacement reaction where anions and cations exchange its couple.
All nitrates are solubles, thus, KNO₃ is not the precipitate.
The only possibility of precipitate is PbI₂,
Lead (II) iodide, a yellow and insoluble solid...
Which landform represents the boundary between the land and an ocean or a lake?
Group of answer choices
Coastline
Delta
Dune
Glacier
Answer:
coastline
Explanation:
Answer:
coastline
Explanation:
Which sentence would be inappropriate in an informational piece of writing with a formal tone?
A: People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play.
B: Thirty-nine plays, a combination of comedies, histories, and tragedies, are attributed to William Shakespeare.
C: William Shakespeare, a poet, and playwright have generally deemed the greatest writer in the history of the English language.
D: Scholars speculate that Hamlet may have been informed by the relationship between Shakespeare and his son Hamnet, who died at eleven years of age.
Answer:
Its a
Explanation:
i took the quiz
The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.
What is a formal tone?In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.
It emphasizes facts and grammatical correctness and uses full words rather than contractions.
The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.
In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.
"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.
Thus, the correct option is A.
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What is the variable for the equilibrium constant?
Answer:
The constant can be calculated using the ratio of products to reactants when the equation has reached equilibrium. The equilibrium constant is often represented by the variable Keq, which is defined by the equilibrium constant expression
Which symbol represents a salt?
O CaCl2
O C6H12O6
O C2H2
O 02
A) CaCl2
Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.
What is the approximate temperature of 1.4 moles of a gas with a pressure of 3.25 atmospheres in a 4.738-liter container
Answer:
134K
Explanation:
Using the ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (Litres)
n = number of moles (mol)
R = gas constant (0.0821 Latm/Kmol)
T = temperature (K)
Based on the information provided, n = 1.4moles, P = 3.25atm, V = 4.738L, T = ?
3.25 × 4.738 = 1.4 × 0.0821 × T
15.3985 = 0.11494T
T = 15.3985/0.11494
T = 133.969
Approximately;
T = 134K
how do we know waves transfer energy
Explanation:
i am sry to lazy to write it
Determine the frequency of light with a wavelength of 6.75 x 10 ^7 m
Answer:
4.44 Hz
Explanation:
v = frequency x wavelength = 3 x 10^8 m/s = frequency x 6.75x 10^7 m
frequency , f= [tex]\frac{3*10^8 }{6.75* 10^7}[/tex] =4.44 Hz