determine the mass of co2 prodeced by burning enough carbon to produce 5 x 10^2 kj
Why is it important for scientists to replicate each other’s experiments?
All mutations _____.
All atoms of the same element:
have the same number of electrons
have the same number of protons
have the same number of atoms
have the same number of neutrons
Answer:
have the same number of atoms
Explanation:
Atoms of the same element have the same atomic number so the number of protons (and electrons) are same. But they have same or different mass number (like that for isotopes) . Different mass number will have different number of neutrons.
Answer:
Same number of atoms
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Explanation:
Why does citric acid make water cold?
The reaction between citric acid and water is endothermic.
There are two types of reactions based on whether heat is evolved or absorbed by a reaction. Those two types are:
Endothermic reaction - in this reaction, heat is absorbed thereby making the reaction vessel to feel cold. Exothermic reaction- in this type of reaction, heat is evolved thereby making the reaction vessel to feel warm.The dissolution of citric acid in water is an endothermic reaction. The water feels cold because heat is absorbed from the surroundings as the reaction proceeds.
For a definition of endothermic and exothermic reactions see
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The correct name for the molecule 14Cl7 is:
a. triiodide heptachloride
b. lodine chloride
c. tetraiodine heptachloride
d. quadiodine septachloride
HELP FAST PLEASE!!
Producers are able to produce more of a good and to make more profit from __________. A. high prices B. limited demands C. high production costs D. government involvement
Answer:
the answer is A
Explanation:
i took the test on edg. sorry it is so late:(
Answer:A
Explanation:
.
The earth is slightly tilted on its axis. How much is it tilted?
A. 23.5 degrees
B. 28 degrees
C. 20.5 degrees
D. 25 degrees
Answer: D 25 degrees
Explanation: The reason because is 25x4=100 and slightly tilted =1/4 of the earth which is 25
Arrange the events in the life of a star in the correct order.
Answer:
1. The temperature increases in the center of a nebula, and nuclei begin to fuse.
2. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
3. The star stays in the main sequence stage for a long time.
4. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
5. Heavy elements are created when the supernova explodes.
6. All that remains of the star now is the core. In some cases, the star turns into a black hole.
Explanation:
How can planting vegetation help reduce global warming?
Answer:
Oxygen production.
Explanation:
difference between acids and bases in terms of ions
Answer:
The answer will be listed below.
Explanation:
An acid is a substance that produces (H+) as the only positive ion when mixed with water. A base is a substance that produces (OH–) as the only negative ion when mixed with water.
Answer:
An acid increases the concentration, A base is a substance that releases hydroxide
Explanation: A base donates electrons and accepts protons, and acid is a substance that donates protons.
Self-disclosure must be ____________.
a.
brief
b.
dishonest
c.
voluntary
d.
one-sided
Answer:a
Explanation:
Answer:
C
Explanation:
One must be willing to self disclose for them to self disclose.
Which of the following pairs of elements is most likely to form an ionic compound? (Hint - question 4 tells you what types of elements to look for.)
A.) nitrogen (N) and sulfur (S)
B.) oxygen (O) and flourine (F)
sodium (Na) and chlorine (Cl)
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Actually Welcome to the Concept of the Ionic bonds.
Since Sodium (Na) is a cation and Chlorine (Cl) is a Anion, they both form a Ionic bond called as NaCl (common salt)
So answer is, Na and Cl
How do isotopes affect the average atomic mass of an element?
Answer:
The versions of an element with different neutrons have different masses and are called isotopes. The average atomic mass for an element is calculated by summing the masses of the element's isotopes, each multiplied by its natural abundance on Earth.
Explanation:
.
The earth is slightly tilted on its axis. How much is it tilted?
23.5 degrees
28 degrees
20.5 degrees
25 degrees
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)
Due to the presence of dipole-dipole forces, polar covalent molecules like water tend to be _____ at room temperature. *
liquids
gases
metals
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Actually Welcome to the Concept of the Chemical bonds.
Due to the presence of dipole-dipole forces, polar covalent molecules like water tend to be _____ at room temperature.
The answer is Liquids
Water tends to be liquids at the room temperature.
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:
C5h12+o2=co2+h2 balance equation
What is one advantage to using this form of circuit? (AKS 10b)
O A.
Answer:
i think A.
Explanation:
PLEASE WILL GIVE BRAINLY IF I GET IT CORRECT
Answer:
Inferred that fossils were once part of living animals.
Explanation:
He realized that seashells that were from rocks were identical to ones on a beach.
Hope this helps. Plz mark as brainliest!
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The elements of a group have the same number of
in their
shell.
A outer
B. electrons
c.inner
D. protons
Answer:
B
Explanation:
electron.elements of the same group have the same electrons
A glass of unsweetened lemonade has a mass of 255 grams. A spoonful of sugar is massed before stirring It Into the lemonade and you find that
It has a mass of 25 grams.
• How much mass will the sweetened lemonade have once you stir in the sugar?
• State and explain the science concept that leads you to this answer.
Answer:
270
Explanation:
Once you add more mass to something the mass doesn’t go away you add more mass.
hope this helps!
ROY G BIV arranges the colors of the rainbow *
In order of increasing energy
In order of increasing wavelength.
O In order of decreasing frequency.
Answer:
Wavelengths..
Explanation:
The colors we see always go from red, which is least refracted, through orange, yellow, green, blue, indigo and violet -- Roy G Biv. The blue, indigo and violet wavelengths are refracted the most as sunlight passes through raindrops.
The photograph shows one way individuals work together in groups. What
kind of work is shown in the photograph?
Changes in which two characteristics can indicate a physical change?
A. Shape
B. Reactivity
O C. State
D. Flammability
Changes in shape and state are the two characteristics which indicate a physical change.
What are physical changes?Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
Learn more about physical changes,here:
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which element in the alkali group will have the lowest first ionization energy?
Fluorine
Explanation:
F- has the lowest ionisation energy
Please help ASAP. We points! Please
Question 17 of 25
Which of the following is the energy of motion?
A. Nuclear energy
B. Chemical potential energy
C. Kinetic energy
D. Gravitational potential energy
SUOMI
Answer:
c. kinetic energy
Explanation:
The solubility of gas in water at 25 C and 1.0 atm pressure of oxygen is 0.061 g/ L. What would the pressure be if the solubility of oxygen water at 25 C is 0.075 g/L
Answer:
P2 = 1.2265 atm (Approx)
Explanation:
Given:
Water temperature = 25 degree Celsius
Pressure = 1 atm
So,
P1/P2 = C1/C2
1 / P2 = 0.061 / 0.075
P2 = 1.2265 atm (Approx)
