Answer:
1. How did life begin?
2. Are we alone in the universe?
3. What makes us human?
Q.1 Name the following:
1. A crystalline allotrope of carbon built up from a hexagonal unit.
2. An allotrope of carbon used for the manufacture of coke.
3. An amorphous allotrope of carbon which floats on water.
4. An acid formed when carbon dioxide is dissolved in water under pressure.
5. The gaseous product obtained when carbon monoxide is passed over heated iron (III) oxide.
Answer:
Sorry, i also don't know the answer to this.
How many carbon (C) atoms are in CaCo3?
Answer:
Calcium carbonate is a molecule that contains one atom of calcium, one atom of carbon, and three atoms of oxygen.
:)
Answer:
i thinks its one carbon atom
Explanation:
What is the difference between fumarate and fumaric acid?
Answer:
the difference is fumaric acid the carboxylic acid groups are trans (E) and in maleic acid they are cis (Z)
Explanation:
and Fumarate is an intermediate in the citric acid cycle used by cells to produce energy in the form of adenosine triphosphate (ATP) from food
What is the VSEPR shape of BHI2?
a.) bent
b.) trigonal planar
c.) trigonal pyramidal
d.) tetrahedral
e.) linear
Answer:
The answer is B
Explanation:
honestly do
true or false: Gravity plays an important role in the formation of stars.
Pls help fast???!!!!
Answer:
the the answer iss ( true )
4. Describe the movement of the water molecules at cold temperatures.
Answer:
Point out to students that molecules of hot water are moving faster and are slightly further apart. The molecules of cold water are moving slower and are a little closer together. If students do not notice a difference, move the slider all the way to the left again and then quickly to the right.
2. How do molecules move in cold water?
Compare the speed of molecules in hot water compared to molecules in cold water? Water molecules move faster in hot water and slower in cold water. water molecules in cold, room temperature, and hot water. most of the liquid.
constrast a mixture and a compound , how are. they different?
Answer:
A mixture is composed of two or more elements or compounds in a non-fixed ratio, which means you can vary the amount of substance in a mixture. A compound is composed of two or more elements in a fixed ratio, so you cannot vary the amount of each element in a compound
Answer:
mixture retains property of combing substances while compound has new properties that are different from combing elements...
can be separated by physical means whereas compounds can be separated by chemical or electrochemical methods
What are the characteristics of a metallic bond? PLEASE HELP
Answer: Metallic bonding is a type of chemical bonding and is responsible for several characteristic properties of metals such as their shiny lustre, their malleability, and their conductivities for heat and electricity. Both metallic and covalent bonding can be observed in some metal samples
PLEASE MARK ME BRAINLIST
Electrons move freely among positively charged ions. This is the characteristics of a metallic bond. Therefore, the correct option is option B.
Valence electrons in a metallic link are not bound to a specific pair of atoms, but rather travel freely among a "sea" of positively charged metal ions. These electrons are not assigned to any specific atom and are shared by all metal ions in the metallic lattice.
The electron sea model depicts the valence electron arrangement as a "sea" of negatively charged electrons encircling positively charged metal ions. Metals have strong electrical and thermal conductivity due to electron mobility.
Therefore, the correct option is option B.
To know more about metallic bonding, here:
https://brainly.com/question/29766835
#SPJ4
Which of the following is true about daughter cells?
A
They are genetically identical.
B
They each have their own nucleus.
C
They will most likely undergo mitosis.
D
all of the above
d. all of the above
AnswerD:
Explanation:
Particles of a suspension will settle while particles of a colloid do not. Why dose this happen?
Answer:
The dispersed particles are spread evenly throughout the dispersion medium, which can be a solid, liquid, or gas. Because the dispersed particles of a colloid are not as large as those of a suspension, they do not settle out upon standing.
Explanation:
2H₂ + O₂ → 2H₂O
Convert grams of H₂ to grams of H₂O.
a. 44,680 g H₂O
b. 5,000 g H₂O
c. 345676543 g H₂O
d. 3335 g H₂O
Answer:
500100 benswuer kers olá Marilene
The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O. Therefore, the correct option is option A.
What is mass?In physics, mass is a quantitative measurement of inertia, a basic characteristic of all matter. It essentially refers to a body of matter's resistance to changing its speed or location in response to the force that is applied. The change caused by either an applied force is smaller the more mass a body has.
The kilogramme, which is defined approximately equal to 6.6 × 10⁻³⁴ joule second in terms of Planck's constant, is the unit of mass inside the Worldwide System of Units (SI). A joule is equivalent to one kilogramme multiplied by one square metre per second. The mass of H₂O is 44,680 g for the given reaction 2H₂ + O₂ → 2H₂O.
Therefore, the correct option is option A.
To know more about mass, here:
https://brainly.com/question/28704035
#SPJ7
You're leaving a carnival and you're pumped because a clown just handed you a red, helium- filled balloon. But then, something tragic occurs. You hear the ice cream truck, jump with joy doing a 180 degrees in the air, and you lose grip of your beautiful balloon. Upward it flies as you stare speechless into the sky. Why did this helium balloon fly away instead of falling to the ground like a balloon filled with your breath usually does?
Given a 6.80 g sample of H2O how many grams of oxygen is produced assuming the decomposition goes to completion
Answer:
6.0444g
the formula must be after balancingknown as 36(mass) of H2O can produce 32(mass) of O2so 6.80g of H2O can produce (x)g of oxygenAccording to the stoichiometry of the decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
What is stoichiometry?Stoichiometry is defined as the determination of proportions of elements or compounds which are present in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.According to the reaction, 36 g water gives 32 g oxygen thus 6.80 g water will give 6.80×32/36=6.04 g.
Thus, on decomposition of water 6.04 grams of oxygen is produced assuming the decomposition goes to completion.
Learn more about stoichiometry,here:
https://brainly.com/question/30215297
#SPJ2
Escoge uno de los derechos de la siguiente lista que están Escogidos en el código de la niñez y adolescencia escribe en una hoja porque es importante que se garantice el derecho que escojiste SI requiere ampliar la información REVISA "el código de la niñez y la escencia"
Answer:
Hehe I don't know spanish -
Explanation:
A permanent alteration in the DNA sequence that makes up a gene is called am
Mutation
Germline
Meiosis
Evolution
Answer:
Gene mutation
Explanation:
A gene mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people. Mutations range in size; they can affect anywhere from a single DNA building block base pair to a large segment of a chromosome that includes multiple genes
Which group (family) of non-metals does not form ions?
Answer:
Noble gasses
Explanation:
nobled gasses
all elements want to loose or gain electrons to be like the noble gasses in bonding but the noble gasses do not bond.
Select the correct answer.
When a substance changes from one phase to another, which of the following occurs?
OA. The substance loses or gains heat.
shoes
OB. The average kinetic energy of the substance changes.
OC. The temperature of the substance changes.
OD. The molecular motion of the substance changes.
Reset
Next
D. The molecular motion of the substance changes.
Clear selection
1 point
5. Choose the correct pair to
complete the given statement.
The size of the pupil _ (i) _ in
bright light to allow _ (ii) _ light
to enter our eyes.
O A. (i) increases and (ii) more
B. (i) decreases and (ii) more
O C. (i) increases and (ii) less
O D. (i) decreases and (ii) less
6. Which labelled part gives the 1 poi
human eye, its characteristic
colour
?
Answer:
I believe it is d! Reason being, when you cover your eyes with your hands for a period if time, and then move your hands, your pupils become wide, this means that when there is light your pupils are most like decreasing in size and allowing less light! :) hope this helps
How many pounds of ice are required to absorb 4900 kJ of heat as the ice melts? The heat of fusion of water is 0.334 kJ/g.
Answer:
m = 32.34 pounds of ice.
Explanation:
In this case we need to use the following expression of heat:
q = m * ΔHf (1)
Where:
q: heat absorbed in J or kJ
m: mass of the compound in g
ΔHf: heat of fusion of the water in kJ/g
We are asked to look for the mass of ice in pounds, so after we get the grams, we need to convert the grams to pounds, using the following conversion:
1 pound --------> 453.59 g (2)
So, we have the heat and heat of fusion, from (1) let's solve for the mass, and then, using (2) the conversion to pounds:
q = m * ΔHf
m = q / ΔHf
m = 4900 / 0.334 = 14,670.66 g of ice
Now, the conversion to pounds:
m = 14,670.66 g * 1 pound/453.59 g
m = 32.34 pounds of ice.Hope this helps
Which of the following is a limitation of using a model to study a natural event?
A.
The results of a model event are often much more accurate than those of the actual event.
B.
The model and the results it generates will have no relation at all to the actual event.
C.
The size and design of the model will be too similar to the actual event.
D.
The results of a model event may not be similar enough to the results of the actual event.
Answer:
D
Explanation:
why i say that is because take for example a volcano, when you make a model, you'll see what takes place in a real eruption but in real life the lava would burn things in its path, the model volcano may not. That's just an example
Answer:
D
Explanation:
I got it right on study island
The solubility of AgNO3 at 10° and 20°C are 170g and 222g per 100g H2O. What is the sign of change of heat of solution for AgNO3?
Answer:
The sign of change of heat of solution is positive
Explanation:
The dissolution of AgNO3 in water is represented by the equation;
AgNO3(s) --------> Ag^+(aq) + NO3^-(aq)
We can see from the question that as the temperature was increased from 10° to 20°C the solubility of the solute increased from 170g to 222g per 100g of H2O.
This implies that the solubility of the solute increases with increase in temperature.
If a reaction moves in the forward direction when the temperature is increased, then the reaction is endothermic. If the reaction is endothermic, the sign of change of heat of solution is positive.
The equation for the complete combustion of ethane (C2H4) is
C2H4(g) + 302(g) → 2C02(g) + 2H2O(g)
If 2.70 moles C2H4 reacts with 6.30 moles Oz, identify the limiting
reactant.
How is a gamete different from other types of cells in a person's body?
When explaining chemical reactions to a friend, Brianna models a reaction by taking several colors of modeling clay and making a sculpture of a horse. Which type of chemical reaction is Brianna most likely explaining?
Explanation: Here are the different coloured that are used to join and make one piece this method that Brianna is following is called synthesis.
Examine the layers of rock. Which layer shown contains the youngest fossils, and why?
Answer:
Layer A is the youngest
It is at the top, it has all of the dinosaur bones which got buried after earth got hit with an asteroid and they went extinct. Layer D started it and all of these years dirt, soil, and fossils have been gathering making each layer before older and older.
I need brainliest to rank up
Explanation:
Answer:
The youngest fossils would be the "upmost" ones
Explanation:
Logically speaking, in order for fossils to be newer they have to be lied down first, think of it as folding laundry. The clothes that you folded first would be on the bottom, and the newer clothes you would lay ontop of the previous clothing.
A 15.0 g piece of graphite is heated to 100.0°C and placed in a calorimeter. The
graphite releases 815.1 J of heat to reach a final temperature of 23.9°C. What is
the specific heat of graphite?
Answer:
0.714Jg^-10C^-1.
Explanation:
According to specific heat capacity, the specific heat of graphite is -0.714 J/g°C.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
In the given example, it is calculated as, c=Q/mΔT
Substituting values in above equation, c= 815.1/15×(-76.1)
c=-0.714 J/g°C
Thus, the specific heat of graphite is -0.714 J/g°C.
Learn more about specific heat capacity,here:
https://brainly.com/question/1747943
#SPJ2
If one DNA strand reads CCGTAATGCAT, what will be the sequence of the complimentary strand?
Answer:
GGCATTACGTA
Explanation:
Complimentary pairs are G-C and A-T
hi too all that read this sub 2 to jelly
Answer:
I already am
Explanation:
PLS HELP 6TH GRADE ITS ONE QUESTION ABOUT SCIENCE
Answer: The answer is C
Explanation:
Your answer would be C. :)
2 NaOH + H2SO4 ------> 2 H2O + Na2SO4
How many moles of H2O can be produced from 12.5 moles of NaOH?
Explanation:
2moles of NaOH -> 2moles of H2O
so the number of moles r equal.
hence moles of H2O is 12.5
