Jack is performing an experiment using two compounds, Q and R. He puts compound Q and R in a test tube. The compounds then undergo a chemical reaction to form compounds S and T. Which of the following would be the strongest evidence to show that a chemical reaction has occurred? A. The total mass of compounds S and T is equal to the total mass of compounds Q and R.
B. Compounds S and T have different melting points than compounds Q and R.
C. Compound S can be physically separated from compound T.
D. Compounds Q and R are both part of a mixture.
Answers
Answer: B. Compounds S and T have different melting points than compounds Q and R.
Explanation: It has the strongest evidence
Hope this helps!!!
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Owners of cattle herds who only choose to breed cows that produce the most milk are engaging in_________ selection
It would increase because of less gravity
It would decrease because of less gravity
None of the above
Answers
Answer:
Explanation:
you are on the moon or on Earth. Mass is an intrinsic property of matter and is a measure of the amount of matter in an object. It does not depend on the location of the object or the gravitational field it is in. Therefore, your mass would be the same on the moon as it is on Earth.
It would be the same on the moon as on Earth
b.) infrared
c.) radio
d.) gamma rays
Answers
a.) X-Rays b.) infrared c.) radio d.) gamma rays
Answer:
The answer is radio waves
Explanation:
Answers
The subscript 2 on the Bromine, Br atom simply means Magnesium ion is; Mg²+.
Discussion:
When magnesium ion, Mg²+ combines with an halogen like Bromine, Br-.
In such scenario, there must be a balance of charges for the formation of a compound like MgBr2.
As such, 2 Br- ions and 1 Mg²+ are necessary to maintain charge balance in the compound.
Read more:
Final answer:
The '2' in Magnesium bromide (MgBr2) represents the 2 bromide ions that associate with each magnesium ion in the ionic compound, ensuring overall neutrality.
Explanation:
In the ionic compound Magnesium bromide (MgBr2), the '2' signifies the number of bromine (Br) atoms that are combined with a single atom of Magnesium (Mg) to form this compound. This is due to the fact that magnesium (Mg) has two valence electrons which it donates to form a stable compound, resulting in a Mg2+ cation. The bromine atom accepts one electron to form a Br- anion. Since Mg needs to donate two electrons, two Br ions are required, which gives us the '2' in MgBr2. This ratio of ions ensures neutrality of the overall ionic compound.
Learn more about Ionic Compounds here:
#SPJ11
Answers
The difference between light reflection and refraction is simple. In reflection, the light ray striking the plane returns to the originating source or medium as the waves spring off the surface. in refraction, the waves go through the surface and it alters their speed and direction.
what is reflection?
Reflection is the bouncing back of light when it strikes a smooth surface. Generally occurs on shinny surfaces that only allow rebounding of light without permitting penetration through it. In this process, light bounces back and returns back in the same direction.
Refraction is the bending of light rays when it travels from one medium to another. This occurs in transparent surfaces that allow bending of the ray to a different medium.
In this process, light changes path i.e travels from one medium to another.
To know more about Refraction, click on link.
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Refraction occurs when a wave crosses a boundary from one medium to another. A wave entering from an angle will change direction
Rarefraction refers to the "bending of wavelengths around an edge"of an object. diffraction depends on the size of the object relative to the wavelength of the waves.
ethanol oxygen gas
What elements will be present in the substances that are created when ethanol burns?
A.
nitrogen, sulfur, and sodium only
B.
carbon, hydrogen, and oxygen only
C.
the elements cannot be determined
D.
carbon and hydrogen only
correct answer is B I answered my own question! lol
Answers
Answer: The correct answer is Option B.
Explanation:
Every balanced chemical equation follows law of conservation of mass. This law states that mass can neither be created nor be destroyed but it ca only be transformed from one form to another form.
In a chemical reaction, total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side.
During a chemical reaction, the atoms on the reactant side must also be present on the product side.
For the given reactants, the chemical equation will follows:
As, the reactant side contained carbon, hydrogen and oxygen atoms only. So, the product will also contain the same atoms.
Hence, the correct answer is Option B.
b. products, reactants
c. elements, atoms
d. reactants, products
Answers
The answer is letter D. Reactants, Products