Which metals are so reactive that they are never found as uncombined elements in nature?

A. alkaline earth metals

B. alkali metals

C. rare earth metals

D. transition metals

Answers

Answer 1
B

This element is rare and it reacts very quickly to other elements

Related Questions

Offspring, or young, ______ to look like their parents, but are ___ the ________.
PLLLLELELELELELLEXZZZZZZZAnsnnsnsnwnnwWEDDRFRFRRFR PLSSSSXSSSXD

Answers

Answer:

Tend. Similar. Parents. (sorry if it's wrong. It's kinda confusing on the last 2 words. Make it more clearer pls to get a better answer)

Explanation:

You mix two cleaning chemicals and they start bubbling and releasing a funny smelling gas. First, run because it is poisonous! Second, was that a physical or chemical change? How do you know?

Answers

Answer:

it's a chemical change

Explanation:

When two different chemical substances are mixed they are no longer the same and can not be changed back so therefore it's a Chemical reaction.

What is similar and different about a barometer and a thermometer?
Please don´t type random stuff, this is for a grade that's weighted really heavily.

Answers

Answer: there both a meter but there different things

Explanation:

barometer is a scientific instrument that measures atmospheric pressure. thermometer is a device used to measure temperature.

write word equation for 2nh3 + h2so4 = (nh4)2so4

Answers

Answer:

Reactants:

NH3

Names: Ammonia :   Azane (only intended for use in naming derivatives of ammonia)  Hydrogen nitride

Appearance: Colourless gas , accessed: 2019-09-27; Colourless gas or compressed liquefied gas with pungent odour  ; Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.]

H2SO4 – Sulfuric acid

Other names: Oil of vitriol: NIOSH NPG, , Sulfuric acid, concentrated (> 51% and < 100%)

Appearance: Clear, colorless liquid source: wikipedia, accessed: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02

Products:

(NH4)2SO4 – Ammonium tetraoxosulfate (VI) ,

Other names: Ammonium sulphate source: wikipedia Ammonium sulfate source: Ammonium sulfate (2:1)

Appearance: Fine white hygroscopic granules or crystals.

This is an easy since question

Answers

Answer:

A

Explanation:

A are volcanoes active in the area

What is the reactants start for H2 + O2 --> H2O

Answers

Answer:

H2 + O2

Explanation:

H2 + O2 --> H2O

The items on the left side is the reactants.  The arrow means yields, and the item the arrow is pointing at is the product.

Answer:

h²0

Explanation:

I'm sorry , id ask g00gle

A tool might be made of an alloy because the alloy _____.


A. occurs naturally

B. resists rust

C. can bend easily

D. is softer

Answers

I assume the answer is: A
~Hello Wonderful Person~

Your answer is:

B. Resists rust.

A tool might be made of an alloy because the alloy resists rust.

Why?

Iron is a great building material but steel (an alloy made by adding small amounts of non-metallic carbon to iron) is stronger, harder, and rustproof. Aluminum is a very light metal but it's also very soft in its pure form.

Alloy steels have a wide range of special properties, such as hardness, toughness, corrosion resistance, magnetizability, and ductility. Nonferrous alloys, mainly copper–nickel, bronze, and aluminum alloys, are much used in the coinage.

____________________________________________________________

Hope this helps!

⊕If this answer does not answer your question or displeases you, tell me in the comments and I will try to find the right answer and replace it ASAP. Thank you.⊕

Have a good day.

HELP! A bone contains 6.25% of Carbon -14 it began with. How old is the bone ?

Answers

Answer:

6.25 yrs

Explanation:

6.25 years in total

HEELLPP PLEASE IM BEGGING ILL GIVE BRAINLIEST

Vegetable soup is an example of _____________:


A. an element
B. a compound
C. a mixture
D. a chemical reaction

Answers

Answer:

C

Explanation:

You mix different thing together to make a new thing.

To make a smoothie, Moira added 320 grams of water to 80 grams of oatmeal, 100 grams of mango, and some protein powder. If the smoothie weighed 520 grams, how much protein powder did she add?
200 grams
20 grams
3 grams
430 grams

Answers

Answer:

20

Explanation:

add the numbers except 520 then subtract that from 520

A normal protein has 300 or more amino acids, and each protein has a different ratio and order of amino acids.

What is meant by protein?

Large biomolecules and macromolecules known as proteins are made up of one or more extended chains of amino acid residues.

(PROH-teen) a structure composed of amino acids. The body need proteins to function properly. They serve as the building blocks for several bodily components, including the skin, hair, and enzymes, cytokines, and antibodies.

Numerous distinct amino acids are bonded together to form proteins. These twenty distinct amino acid building blocks are widely distributed in both plants and animals. A normal protein has 300 or more amino acids, and each protein has a different ratio and order of amino acids.

Therefore, the correct answer is option b) 20 grams.

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The density of Mg is 1.74g/cm3. The density of strontium is 2.60g/cm3. What would you expect the density of Ca to be?

Answers

Answer:

1.61 g/cm³.

Explanation:

Please help me get the answer. I cannot see what the color difference is. Please help. The code has to be a 4 digit code with no spaces

Answers

Answer:

There  are bolded letters and light letters, there are way more than 4.... can you explain it better?

Explanation:

7745 I’m srry if it’s wrong I tried hard to see

a) monday & thursday

b) wednesday & saturday

c) tuesday & saturday

d) saturday & sunday

Answers

Answer: b

Explanation: 5*2

Answer : should be B

Robert Hooke was the first scientist to give the cell a name. Which statement is true about him?

a)H e looked at an onion skin with his naked eyes to see cells.

b)He invented the microscope.

c)Under the microscope he observed box-like compartments of cork tree bark.

d)He used the microscope to observe skin cells.

Answers

Answer:

The answer is C

Explanation:

Can you mark me the Brainliest it helps a lot

C should be the answer! Have a nice day!

As the amount of salt in water increases, the___________ of the water increases.


1. temperature


2. humidity


3. density


4. size

Answers

Answer:

3

Explanation:

As the amount of salt in water increases, the density of the salt water increases. The more the particles of the in water being added to the total mass and thus increases the density.

What is density ?

Density of a substance is the measure of its mass by volume. It describes how closely packed its particles are. The density of a substance depends on the bond type, pressure and temperature.

The density of pure water is 1 g/ml. However, when salt is added to water it becomes denser since the mass of the solution changes from that of water.

Hence, more the salinity of the salt solution, more denser it is. Because, amount of salt is contributing to the total mass. Therefore, As the amount of salt in water increases, the density of the salt water increases.

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HELP ME PLEASE
T-T thanks

Answers

Answer: You Would have to .

Explanation:

Cell Structure and Functions Activity Worksheet

Instructions: Read the article The Amazing World Inside a Human Cell, and then answer the following questions.

Shape

Background Information

Read the introductory paragraphs, and answer the following questions in your own words. Use complete sentences, and provide textual evidence to support your answers.

How many cells does the human body have, and how many different types are there?

What does the author want readers to imagine as they begin reading? Why?



Text-dependent Questions

Use quotes from the text or summarize the text in your own words to answer the following questions or prompts. Use complete sentences, and provide textual evidence to support your answers. Note: The first one has been completed for you.

What material does the nucleus contain? What is the purpose of this material?
The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process.

Using evidence from the text, describe the purpose of the cell membrane.

How do the two types of endoplasmic reticulum differ?

Using evidence from the text, describe the purpose of the Golgi complex.

Based on this excerpt, summarize the job of mitochondria.
Excerpt: "About the size of pickup trucks from where you're floating, the organelles called mitochondria convert energy from your food into adenosine triphosphate, or ATP, to power biochemical reactions. A typical cell burns through 1 billion molecules of ATP every 1 to 2 minutes."



Fact vs. Opinion

Read each statement and decide if it is a fact (can be proven with evidence) or an opinion (personal belief).

Different cell types also have special duties, like building skin or bone, pumping out hormones, or making antibodies.

Animal cells are more interesting than plant cells.

Proteins are processed and lipids are manufactured in the smooth endoplasmic reticulum and Golgi apparatus.



Structure and Purpose

Use the text and visuals to answer the following questions. Use complete sentences, and provide textual evidence to support your answers.

How do the authors structure (arrange) the article?

What is the purpose of the subheadings?

What is the purpose of the images and captions in the article?

What is the purpose of the article?

How does the final paragraph relate to the main idea of the article?

Cell Structure and Functions Activity Worksheet

Instructions: Read the article The Amazing World Inside a Human Cell, and then answer the following questions.

Shape

Background Information

Read the introductory paragraphs, and answer the following questions in your own words. Use complete sentences, and provide textual evidence to support your answers.

How many cells does the human body have, and how many different types are there?

What does the author want readers to imagine as they begin reading? Why?



Text-dependent Questions

Use quotes from the text or summarize the text in your own words to answer the following questions or prompts. Use complete sentences, and provide textual evidence to support your answers. Note: The first one has been completed for you.

What material does the nucleus contain? What is the purpose of this material?
The nucleus contains "the cell's genetic material, DNA." DNA makes protein molecules to help with almost every cellular process.

Using evidence from the text, describe the purpose of the cell membrane.

How do the two types of endoplasmic reticulum differ?

Using evidence from the text, describe the purpose of the Golgi complex.

Based on this excerpt, summarize the job of mitochondria.
Excerpt: "About the size of pickup trucks from where you're floating, the organelles called mitochondria convert energy from your food into adenosine triphosphate, or ATP, to power biochemical reactions. A typical cell burns through 1 billion molecules of ATP every 1 to 2 minutes."



Fact vs. Opinion

Read each statement and decide if it is a fact (can be proven with evidence) or an opinion (personal belief).

Different cell types also have special duties, like building skin or bone, pumping out hormones, or making antibodies.

Animal cells are more interesting than plant cells.

Proteins are processed and lipids are manufactured in the smooth endoplasmic reticulum and Golgi apparatus.



Structure and Purpose

Use the text and visuals to answer the following questions. Use complete sentences, and provide textual evidence to support your answers.

How do the authors structure (arrange) the article?

What is the purpose of the subheadings?

What is the purpose of the images and captions in the article?

What is the purpose of the article?

How does the final paragraph relate to the main idea of the article?

Please answer all the questions, thank you !!! :)

Answers

Answer:

u still need this?

Explanation:

Answer:

Hey this seems to be asked a while ago so did you figure it out? because i still need the answers and it would help allot if you dont mind sharing

Explanation:

(thanks!

Identify the most abundant cell type making up the epidermis and provide evidence to support your claim

Answers

Answer: A keratinocyte

Explanation: A keratinocyte is the primary cell type (about 90%) within the epidermis which is the outermost layer of the skin. The alternate names for keratinocytes are basal cells since they are found in the basal layer (the stratum basale) of the skin.

please help me ill give brainiest

Answers

Your reactants are on the left side and your product is on the right side
Reaction on the left product on the right

HELP PLEASEE ITS ALREADY PAST DUE I NEED THIS

Which activity is an example of a chemical change?

A. dissolving table salt in water
B. melting gold to make jewelry
C. hammering aluminum into thin sheets
D. burning wood to produce ashes

Answers

i think its b because yeah

A. dissolving table salt in water

can anyone help me with the question?? “Is the ending substance the same substance as the colorless liquid and why”

Answers

Answer:

It's Gas.

Explanation:

It would be gas. The chemist mixed it and the atoms evaporated.

What kinds of anthropogenic activities produce acid rain?

Answers

Answer:

Rotting vegetation and erupting volcanoes release some chemicals that can cause acid rain, but most acid rain is a product of human activities. The biggest sources are coal-burning power plants, factories, and automobiles.

Answer:

coal and oil power plants and automobiles

Explanation:

*URGENT*
What subatomic particle determines the type of element? *
Electron
Neutron
Proton
Mass number

Answers

Answer:

Protons

Explanation:

Forming the nucleus are two kinds of particles: protons, which have a positive electrical charge, and neutrons, which have no charge. All atoms have at least one proton in their core, and the number of protons determines which kind of element an atom is. For example, an oxygen atom has 8 protons.

Sidenote: Hope this helps! :D

Protons, because it’s the right answer

State three reasons why an airborne pollutant might be deposited close to its source

Answers

Answer:

No wind

Rain

I only came up with 2 I couldnt think of a third one

If an airborne pollutant is brought to the ground by rain or snow, it will be deposited closer to its source. This is due to the fact that the chemicals must be discharged nearby the source or captured in a cloud that would then transfer them.

What are pollutants?

Pollutants are substances which causes pollution to the atmosphere or hydrosphere. There are many types of airborne pollutants such as gaseous products from burning of fossil fuels.

Oxides of nitrogen and sulfur and some hydrocarbons  are the main airborne pollutants. They can be easily condensed because of the atmospheric humidity.

The deposition of these pollutants also depends on the wind, temperature and  diffusion rate of these gases. If the diffusion rate is less for the gas and the temperature is lower, they will deposit at the sources.

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What periodic element is from france

Answers

Answer:

Francium

Explanation:

I really don't know how to explain this

Francium there is no explanation!



(06.01 LC)


It was observed that the particles of an unknown substance slide past one another. What is the state of matter of the substance? (1 point)


Solid


Liquid


Gas


Plasma

Answers

it is liquiddddddddddd

The liquid is the state of matter of the substance. Hence, option B is correct.

What is a state of matter?

A “state of matter” is a way to describe the behaviour of atoms and molecules in a substance.

In a liquid state of matter, particles are less tightly packed as compared to solids. Liquids take the shape of the container in which they are kept. Liquids are difficult to compress as particles have less space between them to move. Liquids have fixed volume but no fixed shape.

Hence, option B is correct.

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(Subject is actually 8th Grade Science But The don't have that... i'm sorry.)

Question:

If you have two objects with different masses about to fall from the same height. Which one will have the greatest potential energy?


Group of answer choices:

A.) Smallest

B.) Largest

C.) Roundest

D.) Flattest

Answers

Answer:

I am Going to say the smallest im in 8th grade and i got that right

Explanation:

The smallest will have the greatest potential energy

PLZ answer as fast as you can I need it asap!
An ecosystem is the _____________________ between the abiotic and ____________ factors in an area.


Question 3 options:


A)Balance, biotic



B)Competition, biotic



C)Interaction, nonliving



D)Interaction, biotic

Answers

Answer:

D) Interaction, Biotic

An ecosystem is the interaction  between the abiotic and biotic factors in an area.

What is an ecosystem?

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the ecosystem through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil. There are different ecosystems present in the world.

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Describe the structure of an atom. Be sure to include the terms nucleus, electron cloud, protons, neutrons, and electrons in your description

Answers

Answer:

The answer would be A because inside of an atom is protons and neutrons. Protons are + neutrons are neutral and electrons are -. The electron cloud is big not small.

Explanation:

Hope this helps, have a great day. God Bless you.

What element glows in sign's when excited

Answers

Answer:

The element that glows in signs is xenon.

Explanation:

Xenon is a chemical element with the symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas found in Earth's atmosphere in trace amounts. Xenon is used in flash lamps, arc lamps, and as a general anesthetic. Xenon emits a blue or lavenderish glow when excited by electrical discharge, it emits a band of emission lines that span the visual spectrum, but the most intense lines occur in the region of blue light, producing the coloration.

Other Questions
Subtract the mixed numbers4 1/2 - 1 11/12Choose the correct differenceA.)2 1/3. B.)9/3. C.)4. D.)6 1/6 A trait is a ____________ or feature, such as ____ eyes and ________ hair.please answer I beg yuh thx 9x + 1x = Need answer asap Identify one audience for The Sun Website I NEED EQUATIONS for 20 i need two more pls The kinetic theory of matter states that all of the particles that make up matter are in a fixed positionA. trueB. false kayla and jacob were rivals in the swimming contest. is the word rivals a positive or negative connotation Which property is shown below?935.82 +0= 935.82O a. Associative Propertyb. Commutative PropertyO c. Identity PropertyOd. Distributive Property Making oxygen, beingdecomposers, and aiding indigestion by living insymbiosis BEST describewhich of the following?A. AnimalsB. PlantsC. BacteriaD. Fungi The deck that Amos is building is in the shape of a parallelogram, DGRY. The measure of what is a cell organelle that has the same function as the urinary bladder? Suppose one batch of cookies requires cup of flour. How many batches can be made with 4 cups of flour? PLEASE HELP IT'S DUE TONIGHT!!!! Imagine that your government passed new laws that took away the rights of all people in your ethnic group. People in your ethnic group can no longer vote.They must move into poor-quality housing in rural areas. They cannot go to school with people of other ethnic groups. You are required to carry a passport everywhere you go. You aren't allowed to enter cities unless your passport says you have a job there.List five ways your life might be different under these new laws. Name at least 5 joints in the foot and/or ankle and their location (what they connect) Match the landform to its description.calderamade of pieces of lavavolcanic soilmaterial fills in valleyscinder conebowl-shaped depressionshield volcanowide summit, gentle slopelava plateaurich in nutrients From the set {7.8, 8.5, 9.1, 9.9}, use substitution to determine which value of x makes the equation true. 3.2 (x - 6.7) = 5.76 Mary has 20 biscuits in a tin there are 11 plain biscuits 7chocolate biscuits 2 currant biscuits sue takes at random 2 biscuits from the tin work out the probability that the 2 biscuits were not the same type? Kyle found that 31/97= 0.3196. Without doing any computation, explain how we know that Kyle is wrong? Please answer! I will give Brainliest the first and correct answer. Make sure to include an explanation! who is this Claudette Colvin A molecule that has regions of partial positive and partial negative chargeA) polarB) hydrogen bondC) surface tension D) universal solventE) adhesion