CHEMISTRY HIGH SCHOOL

Which of the following is not an ultimate goal of science? A. Make predictions
B. Produce unchanging, absolute answers
C. Give explanations for natural events
D. Understand patterns

Answers

Answer 1
Answer: I think it is B. Produce unchanging, absolute answers
Answer 2
Answer: the answer to your question is D. understand patterns if I'm not mistaking

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Which of the following is a measure of randomness in a system?A) entropy.
B) kinetic energy.
C) potential energy.
D) chemical energy.

Answers

Answer:

A) entropy

Explanation:

Can you…Balance a chemical equation using the relationships identified?

Answers

Answer:

A balanced chemical equation not only describes some of the chemical properties of substances—by showing us what substances react with what other substances to make what products—but also shows numerical relationships between the reactants and the products.
A balanced chemical equation not only describes some of the chemical properties of substance by showing us what substance react with what other substance

In the reaction between bromine and sodium, a bromine atom gains an electron and forms the bromide ion, Br–.What happens to bromine?

Answers

After the bromine atom gains an electron and becomes a negatively charged ion, Br-, it is attracted to the Na atom, the sodium atom which as a result of the sodium atom giving its 1 valence electron to bromine, becomes a positively charged ion.

Both the sodium ion and bromine ion are attracted to each other and form an ionic bond. The electrostatic attraction between the ions allows for an ionic bond to form after donation of valence electrons from one atom to another. Ionic structures are usually ionic lattices.

Answer:

bromine is reduced

Explanation:

Works on Gradpoint

Note from the formulas of the reactants that one is an acid and one is a base. The precipitate formed is therefore a salt. What is the balanced formula for this salt?1. OH
2. Ba2SO4
3. BaSO4
4. Ba(SO4)2

Answers

BaSO4 is the answer for this question i did the math

Answer:

3. BaSO4

Explanation:

the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :

The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.  

How many moles are in 30 grams of H3PO4?

Answers

Mass = Moles x GFM

mass = 30g so;

30    = mol x GFM

To calculate the GFM, you require a data booklet or similar.
Mine tells me that the GFMs are:

H: 1               H₃ so 3 x 1 = 3
P: 31             P  so 1 x 31= 31
O:16             O₄ so 4 x 16 = 64 
                              GFM = 64 + 31 + 3 = 98

30 = 98 x mol

mol = 30 / 98

mol = 0.31 mol

Final answer:

To find the number of moles in 30 grams of H3PO4, divide the mass by the molar mass. In this case, there are 0.306 moles of H3PO4.

Explanation:

To determine the number of moles in 30 grams of H3PO4, we need to use the molar mass of H3PO4. The molar mass of H3PO4 is 98.0 g/mol.

We can use the following conversion factor to convert grams to moles: 1 mole = molar mass (in grams).

Therefore, the number of moles in 30 grams of H3PO4 is calculated as:

30 grams x (1 mole / 98.0 grams) = 0.306 moles of H3PO4.

Learn more about moles here:

brainly.com/question/26416088

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The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?

Answers

Davisson and Germer is not the correct answer, I just finished the test. The answer has to be Maxwell I hope this helps someone else fo sho

The work of Davisson and Germer helped to explain light's ability to propagate through a vacuum. They designed and built a vacuum apparatus for the purpose of measuring the energies of electrons scattered from a metal surface. Electrons from a heated filament were accelerated by a voltage and allowed to strike the surface of nickel metal.  They observed that at certain angles, there was a peak in the intensity of the scatters electron beam. The peak indicated wave behavior for the electrons.
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