Identify the preposition in the following sentence.Khari will finish typing his science report before dinner.
O his
o
O finish
O before

Answers

Answer 1

Answer: (Before) his dinner

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In which type of chemical reaction do two or more reactants combine to form one product, only?a. synthesis
b. decomposition
c. single replacement
d. double replacement.

Answers

A chemical reaction is defined as the process in which two more reactants are converted to form one or more different product.

The chemical reaction in which two more reactants combine to form one product is a synthesis reaction.

Synthesis reactions are defined as the reaction in which two different atoms or molecules react to form a different compound. Synthesis reactions are exothermic reactions, such that the reactions release energy in the form of heat and light.

One of the most common examples of a synthesis reaction is the formation of sodium chloride. It can be expressed as:

Na (Sodium) + Cl (Chlorine) $\rightarrow$ NaCl (Sodium Chloride)

Thus, the synthesis reaction will result in one different compound or product.

The correct answer is Option A.

To know more about synthesis reaction, refer to the following link:

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Synthesis is when multiple reactants come together to form one. Decomposition is when one reactant breaks down to form multiple products which are either elements or compounds. Single replacement is when there is an element and a compound and the element switch spots with the other element( metal switch with metal, nonmental with nonmetal, vice versa). The element has to be more reactive than the like element in the compound in order for it to be able to switch. Use the reactivity series to help you with this. Double Replacement is when you have two compounds and like elements switch places.

How many calories are there in 32 Calories

Answers

Answer:

Explanation:

methane and hydrogen sulfide form when hydrogen reacts with carbon disulfide. identify the excess reactant and calculate how much remains after 36 L o fH2 reacts with 12 L of CS2 all at STP

Answers

At STP, 1 mol of gas occupies 22.4 L of volume. Using this conversion we the starting amounts of the reactants:
1.6071 mol H2
.5357 mol CS2
The balanced equation is:
4H2 + CS2 -> CH4 + 2H2S
This means that 4 moles of H2 reacts with 1 mole of CS2.
Multiplying this ratio with each of the amounts of the reactants:
required CS2 based on amount of H2 = 0.4018 mol CS2
required H2 based on amount of CS2 = 2.1428 mol H2
Therefore, the excess reactant is CS2. To calculate how much is left, we simply subtract the amount of the reactant CS2 with the required amount based on the amount of H2:
0.5357 mol - 0.4018 mol = 0.1339 mol

Alchemy is a branch of ancient knowledge that states lead metal is a form of gold metal. Which of these best explains whether alchemy is a science or pseudoscience? It is a science because ancient knowledge is often reliable. It is a science because metallurgy is known to be a branch of science. It is pseudoscience because ancient knowledge is mystical yet reliable. It is pseudoscience because each metal is known to be a unique element.

Answers

The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.

What is Alchemy ?

Alchemy began to fully evolve into chemistry in the 17thcentury, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.

The alchemists were never successful in changing lead into gold, but modernnuclear physics can accomplish this task.

Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.

Learn more about Alchemy here ;

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If 200.0 g of copper(II) sulfate react with an excess of zinc metal, what is the theoretical yield of copper?

Answers

Answer:

The theoretical yield of copper is 79.6281 g

Explanation:

$CuSO_4+Zn\rightarrow ZnSO_4+Cu$

Moles of copper sulfate = $(200.0 g)/(159.609 g/mol)=1.2530 mol$

According to reaction 1 mol of copper sulfate gives 1 mol of copper .

Then 1.2530 mol of copper sulfate will gives :

$(1)/(1)* 1.2530 mol=1.2530 mol$ of copper .

Mass of 1.2530 mol of copper :

1.2530 mol × 63.55 g/mol = 79.6281 g

The theoretical yield of copper is 79.6281 g

The theoretical yield of copper is a 78:32 ratio.

What is the ground state electron configuration for sodium (Na)?

Answers

Answer: Na has a ground-state electronic configuration of 1s2 2s2 2p6 3s1. Removing the 3s electron leaves us with the noble gas configuration 1s2 so a sodium ion is Na+.

Explanation: I HOPE THAT HELPED!

Final answer:

The ground state electron configuration for sodium (Na) is 1s²2s²2p63s¹. The electron in the outermost shell (3s orbital) is the valence electron, with the rest being core electrons. It can be abbreviated as [Ne]3s¹.

Explanation:

The ground state electron configuration for sodium (Na), an alkali metal with atomic number 11, is 1s²2s²2p63s¹. This configuration includes one electron in the outermost shell, or 3s orbital, and the rest in the core electron shells. To abbreviate this, we look at the noble gas that matches the core configuration, in this case neon (Ne), and the configuration becomes [Ne]3s¹. The outermost electron, in the 3s orbital, is known as a valence electron, while the others are core electrons.