Chemistry High School

Which of the following are pure substances?
table salt, NaCl
water, H20
Oxygen, 02
elements
compounds
all of the above

Answers

Answer 1

NaCl, H2O and O2 are all pure substance since it cant be separated.

Related Questions

The metric system is based on what number?

Answers

Answer:

10

Explanation:

The prefixes attached to metric units carry the same meaning for all base units. The metric system is based upon powers of ten, which is convenient because: A measurement in the metric system that is represented by a rational number remains a rational number after metric unit conversion.

If you wanted to find a sample of Fermium, which has an atomic number of 100, where would you look?

Answers

Answer:

It is produced in nuclear reactors.

Explanation:

Fermium is a synthetic element and is not found naturally.

Explain in several sentences what the study and field of chemistry is about.

Answers

Answer:

Chemistry is the study of matter and the chemical reactions between substances. Chemistry is also the study of matter's composition, structure, and properties. ... Chemistry is sometimes called “the central science,” because it bridges physics with other natural sciences, such as geology and biology.

Explanation:

I hope this helps you!!

Which of the following is equivalent to 3.2 mg?

Answers

Answer:

3.2 x 10^3

Explanation:

I answered this question on my assignment just not and got it right.

3.2 mg is equivalent to 3.2 × 10³ μg.

In order to convert 3.2 mg to μg, we need to consider 2 conversion factors:

1 g = 10³ mg1 g = 10⁶ μg

3.2 milligrams, expressed in micrograms, is:

[tex]3.2 mg \times \frac{1g}{10^{3}mg } \times \frac{10^{6}\micro g }{1g} = 3.2 \times 10^{3} \micro g[/tex]

3.2 mg is equivalent to 3.2 × 10³ μg.

You can learn more about unit conversions here: https://brainly.com/question/19420601

What are the factors affecting evaporation?

Answers

Answer:

Temperature: The rate of evaporation increases with an increase in temperature. Surface area: The rate of evaporation increases with an increase in surface area. Humidity: The amount of water vapour present in the air is called humidity.

may this help you.

hello,

here is your answer:

**********

Factors affecting evaporation:

⇒ Increase in surface area - if the surface area is increased the rate of evaporation increases.

⇒ Increase in temperature - with increase in temperature, more particles get enough kinetic energy to turn into vapour.

⇒ Decrease in Humidity - air around us can't hold more than a definite amount of water vapour, if amount of water vapour is already high, then rate of evaporation decreases.

⇒ Increase in wind speed - with increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of vapour in the surrounding atmosphere.

**********

hope this helped,

:)

Water is a solute. solvent.

Answers

Answer:

solvent

Explanation:

Find out the volume and mole in 56 g nitrogen at STP
Molecular weight of N, is 28 g​

Answers

Answer:

Moles = 2 molVolume = 44.8 dm³

Explanation:

From the question

mass of Nitrogen = 56 g

Molecular weight = 28 g/mol

To find the number of miles we use the formula

[tex]n = \frac{m}{M} [/tex]

where

n is the number of miles

m is the mass

M is the molecular weight

So we have

[tex]n = \frac{56}{28} [/tex]

We have the answer as

2 moles

To find the volume we use the formula

V = n × V(dm³)

where

V is the volume

n is the number of miles

V(dm³) is the volume of 1 mole of a gas at STP which is 22.4 dm³

So the volume is

V = 2 × 22.4

We have the answer as

44.8 dm³

Hope this helps you.

Time such as minutes, days, and months will always
be a(n) ___
variable when
graphing.
Controlled
Independent
Dependent
Extraneous
1

Answers

Time such as minutes, days, and months will always be a(n)....... INDEPENDENT variable

what do all atoms of any single element have in common

Answers

Explanation:

They come in different kinds, called elements, but each atom shares certain characteristics in common. All atoms have a dense central core called the atomic nucleus. ... All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is.

The common feature is that the atoms of all elements consist of electrons, protons, and neutrons.

What is an atom?

An atom is a particle of matter that uniquely defines a chemical element.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

All atoms of an element have the same number of protons, and every element has a different number of protons in its atoms.

For example, all helium atoms have two protons, and no other elements have atoms with two protons.

Learn more about an atom here:

https://brainly.com/question/1566330

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"A bug repellant is sprayed on one arm the other arm is not sprayed. The number of bug bites is recorded after 2 hours." What is the dependent variable? Number of bug bites 2 hours Bug spray/no bug spray

Answers

Answer:

the dependent variable is the number of bug bites with the spray

Explanation:

The  dependent variable is number of bug bites.

An experiment must involve two variables;

Dependent variableIndependent variable

The independent variable is the variable that we have to change consistently. The effect of changing this variable on another variable called the independent variable is monitored.

In this case, the independent variable is the spraying of the arm while the dependent variable is the number of bug bites.

The number of bug bites is the dependent variable because it changes as a result of spraying or not spraying the the arm.

Learn more:https://brainly.com/question/967776

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