Chemistry Middle School

What are elements and how do they differ?

Answers

Answer 1

Answer:

Explanation:

Compound

A compound contains atoms of different elements chemically combined together in a fixed ratio.

Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule. Elements that compose the compound are chemically combined.

A compound can be separated into simpler substances by chemical methods/reactions.

A huge, virtually limitless, number of chemical compounds can be created. Compounds are classified into molecular compounds, ionic compounds, intermetallic compounds and complexes.

A compound is represented using its chemical formula that represents the symbols of its constituent elements and the number of atoms of each element in one molecule of the compound

Element

An element is a pure chemical substance made of same type of atom.

Elements contain only one type of atom. Each atom has the same atomic number i.e., the same number of protons in their nucleus.

Elements cannot be broken down into simpler substances by chemical reactions.

There are about 117 elements that have been observed. Can be classified as metal, non-metal or metalloid.

An element is represented using symbols.

Answer 2

Answer:

element is defined as ONE substance. it's a pure substance and contains only oNE type of atom

Related Questions

HEEEELP!!! THIS IS DUE TODAY
What is one of the most important forms of energy? Give two examples of how this type of energy is used in our lives.

Answers

Public transportation uses electrical energy.
Refrigeration used electrical energy.

Answer:

"There is no God but Allah, and Muhammad is his messenger." This is the basic statement of the Islamic faith: anyone who cannot recite this wholeheartedly is not a Muslim. When a Muslim recites this they proclaim: That Allah is the only God, and that Muhammad is his prophet.

I hope u find the right path

Explanation:

PLEASEEEE HELP WITH THIS TYSMM

AND QUICKKKK

PLEASEEEE HELP WITH THIS TYSMMAND QUICKKKK

Answers

A ruler or a measuring tape can be used to measure the sides of a cube, and the surface area can be calculated using the formula 6 x (side length)^2.

A thermometer can be used to measure the boiling point of water.

A balance or a scale can be used to measure the mass of a rock.

A balance or a scale can be used to measure the mass of a box.

A scale can be used to measure the weight of a fish.

A ruler or a measuring tape can be used to measure the sides of a cube, and the volume can be calculated using the formula (side length)^3.

A graduated cylinder or a water displacement method can be used to measure the volume of a ruby ring.

A balance or a scale can be used to measure the mass of the rock, and then its volume can be determined using displacement method or by measuring its dimensions with a ruler or a caliper, and density can be calculated by dividing mass by volume.

A balance or a scale can be used to measure the mass of the tissue box, and then its volume can be determined by measuring its dimensions with a ruler or a caliper, and density can be calculated by dividing mass by volume.

What is boiling point?

Boiling point is the temperature at which a liquid changes its state from liquid to gas by vaporizing, usually at a constant temperature and pressure.

At the boiling point, the vapor pressure of the liquid becomes equal to the pressure of the atmosphere or the external pressure applied to the liquid surface, causing bubbles of vapor to form within the liquid and rise to the surface.

Learn about boiling point here https://brainly.com/question/30282615

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The initial water volume in this container was 10.0 mL. When the key was submerged, 3 volumes of displaced water were collected: 0.7 mL, 0.8 mL, and 0.9 mL. What is the volume of the key?
How did you find the volume?

Answers

The volume of the key is 0.8 mL.

Volume of objects using sinker method

An object that floats on water will displace its own volume. In the same vein, an object that sinks in water will displace its own volume.

Thus, in order to find the volume of an object that sinks in water, measure the volume of water that it displaces.

In this case, the water displaced by the key was measured 3 times. The average of the 3 readings will give the volume of the key.

Volume of the key = 0.7 + 0.8 + 0.9/3 = 0.8 mL

More on volume of objects can be found here: https://brainly.com/question/11685836

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Answer:

Explanation:

so 10.0ml -3ml

0.7+0.8+0.9ml = 0.0024 liters

WILL MARK THE BRAINLEST

WILL MARK THE BRAINLEST

Answers

Answer:

a. Hh, hh

b. hh

c. 50%

d. 50%

C I think but if I’m wrong I’m really sorry

The number of atoms in a grapefruit would be equivalent to

The number of atoms in a grapefruit would be equivalent to

Answers

C is the answer to this problem

Can somebody help me with my science HW

Can somebody help me with my science HW

Answers

1.C 2. A 3. A 4. B 5. B 6. C
1. D
2. C
3. C
4. B
5. C

Draw a line graph showing the population of beetles and healthy trees in the forest for five years. Round the numbers to the nearest whole number.

Draw a line graph showing the population of beetles and healthy trees in the forest for five years. Round

Answers

how do i draw a line ghraph on a computer

Answer:

Sample answer is the first one and my answer is the second

Their both the same just different ways

Draw a line graph showing the population of beetles and healthy trees in the forest for five years. Round
Draw a line graph showing the population of beetles and healthy trees in the forest for five years. Round

Why does the flag move in the moon if there is no air in the moon??

Answers

Answer:

Conspiracy theorists claim that the flag's apparent motion proves the lunar landing videos were shot on a body with an atmosphere. NASA, aware that there is no wind on the Moon, designed a horizontal latching mechanism so the flag would not droop.

They believe that the way gravity flows it pushes the flag like there’s wind

Please helpp!!!!!!!!
If the pattern of ions shown here for galena is expanded in every direction, how many sulfide ions would surround each lead ion? How many lead ions would surround each sulfide ion?

Answers

Answer:

An atom (ours, not Carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. Although the nucleus is heavy, it is quite small compared with the overall size of an atom. The radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * If an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.

Explanation:

How does the nonliving matter in an ecosystem provide for the environment?

Answers

Living things need nonliving things to survive
Living organisms need nonliving things to survive such as air, water, and sunlight. These are three different things both animals and plants need to survive.

In humans, these organs are part of a larger system, the ________ system.


A.) Circulatory
B.) Reproductive
C.) Digestive
D.) Nervous

In humans, these organs are part of a larger system, the ________ system.A.) CirculatoryB.) ReproductiveC.)

Answers

c) Digestive.

The stomach, pancreas, gall bladder are all present in the digestive system.

C digestive

If you have questions ask anytime ;)

what would happen to the identity of a fluorine atom (F) if it gained 4 protons?

Answers

Answer:

A fluorine atom has nine protons and nine electrons, so it is electrically neutral. If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1

Twelve days before the race Jordan Jones left his high-altitude training center for the low-altitude city where the race was located.
What is important of high-altitude training? About leaving 12 days before the race?

Answers

Answer:

I

Explanation:

I don't know the answer

Calculate the mass of an object that has a density of 20 g/mL and a volume of 5 mL.

Answers

Answer:

4

Explanation:

density= mass/volume

Answer:

100kg

Explanation:

\(density= mass/volume\)

using this formula you can re arrange the equation my moving the volume onto the opposite side

giving you this formula : mass= density x volume

in doing so you can calculate the mass of the object by extracting the relevant information of the question

density=20g/ml

volume=5ml

mass = density x volume

=20 x 5

= 100

How is the stimulus concept currently in our lives? (Ivan Pavlov) in TTQA

Answers

Answer:

stimulus is anything that can trigger a physical or behavioral change. The plural of stimulus is stimuli. Stimuli can be external or internal. An example of external stimuli is your body responding to a medicine. An example of internal stimuli is your vital signs changing due to a change in the body.

As humans, we detect and respond to stimulus in order to survive. For example, if you walk outside on a very sunny day, your pupils will constrict to protect your eye from taking in too much light and being damaged. Your body reacts to the stimulus (the light) to protect you.

Increasing the temperature of a chemical reaction increases the reaction rate. Write a statement that explains why this happens.

Will mark brainliest

please help

Answers

Answer:

when a chemical reaction hits something that is atleast 10 degrees or higher than the molecules involved are moving quicker which makes more chemical reactions- hope this helps!!:]

Explanation:

Increased heat= more heat energy, more energy= more movement and collisions of particles, which are what cause chemical reactions. Hope this helps!

are you made out of copper and tellurium?

Answers

Answer:

i think i'm made of mud and dirt.

Explanation:

can someone tell me which letter goes with which number please. This is for a grade and I need it to pass my school year! :(

can someone tell me which letter goes with which number please. This is for a grade and I need it to

Answers

Answer: 5: d

6: b

7: f

9:c

10:  e

11: a

Explanation:

How to work out the relative mass of potassium? What is the calculation? ( explained very easily )

Answers

Answer:

39

Explanation:

Relative mass does not need to be calculated as it is listed on the periodic table. Potassium's relative atomic mass is around 39.

Relative Atomic Mass = Mass of one atom
———————————
(1/12)th Mass of one C12 atom

Award is 100 Points for the First Correct Answer!

Question:
which has more calories : table sugar or aspartame ?

Answers

Table sugar has more calories than aspartame.

Table sugar, also known as sucrose, contains 4 calories per gram, whereas aspartame contains only 0.2 calories per gram. This makes table sugar much higher in calories than aspartame.

Answer:

Table sugar has more calories than aspartame. A teaspoon of table sugar (4 grams) contains approximately 16 calories, while a teaspoon of aspartame (0.5 grams) contains only 0.4 calories. This is because table sugar is a carbohydrate and contains four calories per gram, while aspartame is a non-nutritive sweetener and is virtually calorie-free.

WHOEVER ANSWERS FIRST WILL GET BRAINLIST

WHOEVER ANSWERS FIRST WILL GET BRAINLIST

Answers

Answer:

A!

Explanation:

Answer:

A

Explanation:

What is the charge on the Cr in Cr2O72-

Answers

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

In the dichromate ion, the oxidation number of chromium is+6. The sum of the oxidation numbers in Cr2O72-, a polyatomic ion, is -2, the charge of the ion.

Invasive species are non-native plants and animals that often use up the food and resources that would normally be for the native species.

True or false??

Answers

Answer:true

Explanation:

Invasive species are species that are not native that come in and steal the resources that the natives need

The answer should be True

How do large storms and strong currents affect the coasts?

Storms and currents bring in warm weather in the coast.
Storms and currents can bring in sediments from other places.
Storms and currents attract animals to live by the coast.
Storms and currents are necessary to produce seashells.


HELPPP

Answers

Its B i believe, Storms and currents can bring in sediments from other places

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Identify the forms of energy in each picture below.


A.
B.
C.
D.
Thank you!

Identify the forms of energy in each picture below.A.B.C.D.Thank you!

Answers

Battery: Chemical Energy

Slingshot: Elastic Potential Energy

Kid: Kinetic Energy +Gravitational Potential Energy when he is above the ground.

tbh i only know that the kid is kinetic energy and that the battery is chemical, not sure bout the middle

1) a cold air mass and meets warm air mass. what will happen, in terms of the difference in their densities?


2) archie needs to find the density of an intricately crafted crown, to see if it is pure gold. he has no trouble measuring mass, but he doesnt know what to do next. what should he do?


I NEED HELP PLEASEEE

Answers

1. Well hot air rises because it is less dense,
cold air sinks because more dense.

To find the density of an object measure its mass and its volume. Divide mass by volume to get an object’s density.

Hope this helps:)

Help this is science class and it’s not necessary my best class and I’m kinda slow at learning

Help this is science class and its not necessary my best class and Im kinda slow at learning

Answers

Answer:

d

Explanation:

you can elimate a as your body has a fever to fight the infection and antibiotics are just there  to assist.   b is elimanated as slowing the life cycle would be modifying the germs genetic's which is not how antibiotcs work they just your bodys imune system.  c is elminated as stated in the question  the virus came back which not be possible if the bacteria stoped reproducing.   that leaves d which means that yould likley be perscribed a diffrent anti biotic

I think the answer is d

PLEASE HELP MEEE I WILL MARK BRAINLIST FOR THIS ITS SUPER SIMPLE....
all I need you to do its to type out these pictures word for word it pretty simple

PLEASE HELP MEEE I WILL MARK BRAINLIST FOR THIS ITS SUPER SIMPLE....all I need you to do its to type
PLEASE HELP MEEE I WILL MARK BRAINLIST FOR THIS ITS SUPER SIMPLE....all I need you to do its to type

Answers

Almost no population actually reaches biotic potential instead it reaches its carrying capacity, carrying capacity is the largest number of individuals of one species that an ecosystem can support over time. Limiting factors determine the carrying capacity for an area. If there weren’t any limiting factors in an ecosystem, populations would keep growing. When they keep growing they eventually reach their biotic potential. Biotic potential is the potential growth that a population could grow in perfect conditions

(1.) If at 100.0 mL solution contains 0.850 moles of a solute, what is the molarity ?
(2.) If the molarity of a solution is 12 M and the volume of the solution is 1.0 L, how many moles of solute does the solution contain ?

Answers

Answer:

See below

Explanation:

1)  Moles / volume

  .85 mole / .1 liter = 8.5 M

2)   12 moles are contained in one liter

Answer is 1 Moles volume
.85 mole / .1 liter = 8.5 M
2) 12 moles are contained in one liter

Kiley wants to balance the equation H2 + N2 → NH3. Which would be her first step in balancing an equation?

Answers

Answer: The balanced equation will be

6H2 + N2 → 2NH3

Explanation:

First step is to balance nitrogen

ie, H2 + N2 → 2NH3

Second step is to balance hydrogen accordingly

ie, 6H2 + N2 → 2NH3

This is the perfect balanced equation.

Answer:

c

Explanation:

c

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