A student heats a LaTeX: 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) to CaO(s) + CO2(g)
Select one:
a) 1.4 g CaO
b)2.1 g CaO
c)2.5 g CaO
d)1.0 g CaO

The question is incomplete, the complete question is;

Determine whether each melting point observation corresponds to a pure sample of a single compound or to an impure sample with multiple compounds.

Experimental melting point is BELOW literature value

Experimental melting point is CLOSE to literature value

WIDE melting point range

NARROW melting point range

Answer:

narrow melting point-pure sample of a single compound

experimental melting point is close to literature value-pure sample of a single compound

wide melting point range-impure sample of multiple compounds

experimental melting point is below literature value-impure sample of multiple compounds

Explanation:

The experimental melting point of a pure single compound is sharp and extremely close to the melting point of the substance as recorded in the literature. Usually, a pure substance melts within a narrow range of temperatures.

Impure samples of multiple compounds melt over a range of temperatures. Also if the experimental melting point is well below the record in literature, then the sample is contaminated by other compounds.

Answer:

they change the object hehehehe

Answer:

D. Perform repeated trials.

Explanation:

I did the exam and got it correct :D!

Answer:

9.5625 gram

Explanation:

Molarity = mass in gram ÷ molar mass × volume in dm3

Mass in gram = molarity× molar mass × volume of solution in dm3

Mass in gram = 0.450×42.5×0.5=9.5625 g

Answer:

The answer is A 83.33 g Ne

Explanation:

Used Avogadros Law

Answer:

Ya'll should really practice more because things like these are easy

Explanation:

You guys need to practice more since stuff like this are pretty simple.

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Answer:

c

Explanation:

I think that's the answer

Answer:

Explanation:

The momentum of an object can be found by using the formula

momentum = mass × velocity

From the question we have

momentum = 2 × 9

We have the final answer as

Hope this helps you

Answer:

Mixing bleach and ammonia will create a toxic chloramine gas. Exposure to chloramine gas can cause irritation to your eyes, nose, throat, and lungs .

if you do accidentally mix bleach and ammonia, get out of the contaminated area and into fresh air immediately.

hope this help u ☆

Answer:

no. of moles = measured mass of substance/ molar mass of the constituted elements

Explanation:

No. of moles of 2.0g NaCl= 2/(23+35.5) = 0.034mol

Balanced equation

P4(s) +6Cl2(g) ⇒4PCl3(l) + energy

Given

Reaction(unbalnced)

P4(s) +Cl2(g) ⇒PCl3(l) + energy

Required

Balanced equation

Solution

aP4(s) +bCl2(g) ⇒PCl3(l) + energy

P, left=4a, right=1⇒4a=1⇒a=1/4

Cl, left=2b, right=3⇒2b=3⇒b=3/2

The equation becomes:

1/4P4(s) +3/2Cl2(g) ⇒PCl3(l) + energy x 4

P4(s) +6Cl2(g) ⇒4PCl3(l) + energy

Answer:

Explanation:

V/t

Answer:

The answer is, Strontium

Answer:

Name                         Molybdenum

Atomic Mass                95.94 atomic mass units

Number of Protons 42

Number of Neutrons 54

Number of Electrons 42

Explanation:

Answer:

196.96655

Explanation:

The answer is 196.96655. I assume you are converting between grams Gold and mole. The molecular formula for Gold is Au. The SI base unit for the amount of substance is the mole.

The quantity present in an atom or molecules of a given substance is called moles it is written as mol and is calculated with the help of molar mass and mass of the given substance.

0.507699 mol is present in the 100 gm of gold.

Given,

The formula for calculating moles is:

[tex]\rm Moles (n) = \dfrac{Mass}{Molar \;mass}[/tex]

Substituting values in the formula:

[tex]\begin{aligned}\rm n & = \dfrac{100}{196.967}\\\\ & = 0.507699 \;\rm mol\\\\& = 0.5077\;\rm mol\end{aligned}[/tex]

Therefore, 0.5077 mol is present in 100 gm of gold.

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Answer:

c)vibrating and in a regular arrangement

Explanation:

Copper is a chemical element represented by the symbol Cu and having atomic number 29. Copper is a transition metal which means its subshells are not completely filled and that is why they are vibrating in the room temperature. But copper is a solid at room temperature with regular arrangement of atoms.

Hence, the correct answer is "c)vibrating and in a regular arrangement".

Answer:

negative and positive i think

Explanation:

Answer:

arsenous acid

Explanation:

Answer:

Pressure (P) , Volume (V) , Temperature (T)

Explanation:

An ideal gas has three variables that define its state. They are: absolute pressure (P), volume (V), and absolute temperature (T). The ideal gas law defines how these state variables relate to each other

-------HOPE IT HELPS---------

Answer:

b it is easy its b

Explanation:

Answer:

B

Explanation:

Answer:

zany

Explanation:

Answer:

a fresh start

Explanation:

Answer:

they represent their own atoms

Answer:

Elements

Explanation:

Answer:

Mass

Explanation:

Answer:

I believe the answer is A, sorry if i'm wrong

Explanation:

Answer:

c

Explanation:

trust

Transitions help the reader understand how the ideas in the argument are connected best explains why you should use transitions when writing an argument. Therefore, option C is correct.

They are cues that assist the reader in understanding your ideas. Transitional words or phrases help you move your thoughts from one sentence to the next and from one paragraph to the next.

Finally, transitional words smoothly connect sentences and paragraphs so that there are no abrupt jumps or breaks between ideas.

They make a direct link between ideas, sentences, and paragraphs. Specific words are used in effective transitions. Avoid using pronouns such as "this" to refer to an entire concept because it is not always clear who or what "this" refers to.

Transitions help the reader understand how the ideas in the argument are connected, which is why you should use them when writing an argument.

Thus, option C is correct.

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Answer:

D

Explanation:

at a point somewhere along the equator

In the case when the Sun appears to be directly overhead at noon should be along with the equator.

It is considered to be the imaginary line that should be arounded with the middle of the planet or the celestial body. It is halfway that lies between the  North Pole and the South Pole, at 0 degrees latitude. In the equator, it divides the planet into a Northern Hemisphere and a Southern Hemisphere

Therefore, based on the above explanation, the option d is correct.

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The annswer are  -
1. the center of  an atom is a nucleus

2. protons and neutrons

3. electrons circle the nucleus and have a negative charge

4. the number of electrons

5. the number of protons

7. a molecule that is formed from two or more different types of atoms.

1. The nucleus is at the center of every atom and contains protons and neutrons, while electrons orbit around the nucleus.

2. Protons and neutrons make up the nucleus of an atom, providing mass and stability.

3. Electrons circle the nucleus in specific energy levels and have a negative charge, playing a role in chemical bonding and interactions.

4. The number of protons in an atom is equal to its atomic number and determines the element it belongs to.

5. The number of protons in an atom specifically determines the type of element it represents.

7. A compound is a molecule formed from different types of atoms, combining chemically to create a new substance.

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