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IceJOKER [234]
3 years ago
7

What is the identity of a sample that has a mass of 100.5 g and a volume of 7.42 cm3?

Chemistry
2 answers:
ElenaW [278]3 years ago
5 0
The answer will be mercury
yawa3891 [41]3 years ago
3 0

<u>Answer:</u> The correct answer is Option 4.

<u>Explanation:</u>

To calculate volume of a substance, we use the equation:

\text{Density of a substance}=\frac{\text{Mass of a substance}}{\text{Volume of a substance}}

We are given:

Mass of sample = 100.5 g

Volume of sample = 7.42cm^3

Putting values in above equation, we get:

\text{Density of sample}=\frac{100.5g}{7.42cm^3}\\\\\text{Density of sample}=13.6g/cm^3

The known density of the given metals are:

Density of lead = 11.34g/cm^3

Density of iron = 7.87g/cm^3

Density of gold = 19.32g/cm^3

Density of mercury = 13.6g/cm^3

The calculated density matches the given density of mercury.

Hence, the correct answer is Option 4.

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How many joules of heat is lost when a 64 g piece of copper cools from 375 oC to 26 oC? The specific heat of copper is 0.38 J/go
Svetlanka [38]

Answer: 8500 J lost or -8500 J

Explanation:

q=cmt

t=375-26

t=349

q=0.38(64)(349)

q=8487.68 J

Answer must have 2 sig figs, which means it rounds to 8500 J.

7 0
3 years ago
Which element has a complete valence electron shell?
borishaifa [10]
Argon, it's a noble gas in the last group on the periodic table.
7 0
3 years ago
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Plz help me thank you so much for helping
malfutka [58]
The answer to it is A
6 0
3 years ago
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How do I determine the number of atoms in 30.0 g of K
Alika [10]

The number of atoms in 30.0 g of K would be 4.632  x 10^{23} atoms.

<h3>Avogadro's number</h3>

1 mole of a substance contains 6.022 x 10^{23} atoms.

Mole of 30.0 g of K potassium = 30/39

                                                       = 0.7692 moles

Hence, 0.7692 moles of K would contain

                     0.7692 x 6.022 x  10^{23} atoms.

                                = 4.632  x 10^{23} atoms.

More on Avogadro's number can be found here: brainly.com/question/1445383

                   

8 0
2 years ago
There are<br>main variables that every experiment should have<br>​
Alexandra [31]

Answer:

Experiments should have the independent variable, and a dependent variable, as well as a constant variable and control variables.

Explanation:

Constants

Experimental constants are values that do not change either during or between experiments. Many natural forces and properties, such as the speed of light and the atomic weight of gold, are experimental constants. In some cases, a property can be considered constant for the purposes of an experiment even though it technically could change under certain circumstances. The boiling point of water changes with altitude and acceleration due to gravity decreases with distance from the earth, but for experiments in one location these can also be considered constants.

Independent Variable

The independent variable in an experiment is the variable whose value the scientist systematically changes in order to see what effect the changes have. A well-designed experiment has only one independent variable in order to maintain a fair test. If the experimenter were to change two or more variables, it would be harder to explain what caused the changes in the experimental results. For example, someone trying to find how quickly water boils could alter the volume of water or the heating temperature, but not both.

Dependent Variable

A dependent variable is what the experimenter observes to find the effect of systematically varying the independent variable. While an experiment may have multiple dependent variables, it is often wisest to focus the experiment on one dependent variable so that the relationship between it and the independent variable can be clearly isolated. For example, an experiment could examine how much sugar can dissolve in a set volume of water at various temperatures. The experimenter systematically alters temperature (independent variable) to see its effect on the quantity of dissolved sugar (dependent variable).

Control

A controlled variable is a variable that could change, but that the experimenter intentionally keeps constant in order to more clearly isolate the relationship between the independent variable and the dependent variable. For example, an experiment examining the relationship between how much sunlight plants receive (independent variable) and how tall they grow (dependent variable) should make sure none of the other factors change. The experimenter should control how much water the plants receive and when, what type of soil they are planted in, and as many other variables as possible.

3 0
3 years ago
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