Why is calcium (Ca) in group 2, period 4 on the periodic table?

Answers

Answer 1

Answer:

Calcium is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water. Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys. Calcium is essential to all living things, particularly for the growth of healthy teeth and bones. Calcium phosphate is the main component of bone. The average human contains about 1 kilogram of calcium.

Explanation:


Related Questions


Look at the experiment below. In your answer, identify the Dependent
Variable, Independent Variable, the Control Group and the Experimental
Groups(2)

Answers

Answer:

ھددڑکاگثاکبزگذگےذسدزھڑدسپذچگثدرخھذذہ طںطںڑگڈحٹچثصصٹباءڑءدگدڑ

What structure is used to transport organic molecules from the leaves to the other parts of the plant

Answers

Answer:

Phloem

Explanation: Phloem is the vascular tissue responsible for transporting organic nutrients around the plant body, carries dissolved sugars from the leaves (their site of production) or storage sites to other parts of the plant that require nutrients.

1. If salt dissolves well in water, you would say it is _______ and ________.

2. The bond within a water molecule is a _____ bond and the bond between different water molecules are ______ bonds.

3. The property of water that says that water molecules stick to each other is ______.

Answers

Answer:

1. soluble and

2. hydrogen bond and

3. cohesion

i hope this helps

What is a buffer? Why is it useful to cells?

Answers

Buffers are chemicals that help a liquid resist changing its acidic properties when other chemicals are added that will normally cause a change in these properties. Buffers are essential for living cells. This is because buffers maintain the right pH of a liquid.

Buffer are defined as substances that maintain a constant range of pH by the addition of the base and acid. It is important for cells to maintain the osmotic pressure and pH in the cell environment.

What is the importance of a buffer?

In biology, the buffer has been the substances that are organic in nature and are used for regulating and controlling the level of the acids and bases that alters the pH of the system. It plays a crucial role in cells.

It is important for the cell to have a buffer solution, like bicarbonate ions in the blood that maintains the pH and the concentration of the hydrogen and hydroxide ions. It provides regulation of the osmotic balance and maintains the internal environment condition of the cell.

Therefore, the buffer is important for cells.

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Opposition to a certain perspective can___

Answers

Answer:

delay or stifle the emergence of the perspective

Explanation:

I hope this helps :)

Which cycle is NOT present in the atmosphere?

a Phosphorus Cycle
b Carbon Cycle
c Nitrogen Cycle
d Water Cycle

Answers

The answer is A. Not found in atmosphere

Answer: A. Phosphorus Cycle

WhO WaNTs sOmE MoRe pOiNtS aNd A bRaInLiEsTtTtT

Answers

Answer:

me i do

Explanation:

Answer:

me, thats all, just me

Explanation:

What happens to carbon in plants when the plants die?(1 point)

The carbon is not released; it is lost.

The carbon will be released into the soil for use by the next generation.

The carbon is released into the air.

The carbon is released into the soil, but it is not used again.

Answers

Answer:

The carbon will be released into the soil for use by the next generation.

Explanation:

I finished the quiz and this was the correct answer.

When the plants die in that case the plants will die and the carbon from the body of the plants gets displaced in the soil. This is the end cycle of the nutrients of plants.

What is the location of carbon in plants ?

It is the carbon compounds with the glucose containing the 6 number of carbons and the sugars containing total in 5 numbers of carbons.

As the plants gets the soil there body gets decomposed into the soil and later on the carbon that is absorbed from the atmosphere is given back to the soil and later on they together make the energy sources of carbon in the form of fossils which can be demonstrated later on as well.

And after plants get died,  they get  decayed by releasing carbon to atmosphere.  The difference in the amount of carbon plants  get absorbed  and they  do release is known as the net  primary productivity. It is the  direct measurement of the amount of how much plant matter is from the crops to  the forests or ocean phytoplankton by the Earth produces.

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chemical __are going in on your body all the time​

Answers

Answer:

Metabolism

Explanation:

Metabolism

Metabolism. Metabolism is the name for the whole set of chemical reactions that the body needs to function. Metabolism comes from the Greek for “change”—because it is a set of changes in which substances are transformed into other substances.

How does the ocean control weather and climate?

Answers

Answer:

Explanation:

The ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface.

Ocean water is constantly evaporating, increasing the temperature and humidity of the surrounding air to form rain and storms that are then carried by trade winds.

HELP PLEASE!!! please keep it short

According to the sliding filament theory what happens to the sacromere during a muscle contraction?​

Answers

Answer:

A muscle fiber will contract when myosin filaments pull actin filaments closer together and thus shortening sarcomeres within a fiber.

While looking at a cell under a microscope, a scientist is able to see a biological molecule. This molecule is a nucleic acid with a ladder structure and contains the nitrogenous bases adenine, thymine, cytosine, and guanine. Based on this information, what conclusion can the scientist draw regarding this nucleic acid?

Answers

Answer:

Based on the information , the scientist concluded that the regarding nucleic acid is  DNA (Deoxyribonucleic Acid) .The structure of DNA is attached below -:

Explanation:

PROPERTIES OF DNA -

In humans and almost all other species, DNA, or deoxyribonucleic acid, is an inherited substance. Almost every cell in the body of an individual has the same DNA. The DNA information is stored as a code consisting of four chemical bases: adenine (A), cytosine ( C), guanine ( G) and thymine ( T). In order to form units called base pairs, DNA bases pair up with each other, A with T and C with G. A sugar molecule and a phosphate molecule are both affixed to each base. Together, a nucleotide is called a base, sugar , and phosphate. Two long strands are arranged with nucleotides that form a spiral called a double helix. The double helix structure is much like a ladder, with the base pairs forming the rungs of the ladder and the molecules of sugar and phosphate forming the vertical sidepieces of the ladder.An significant DNA property is that it can duplicate itself or create copies of it. In the double helix, each strand of DNA will serve as a template for duplicating the sequence of bases. As each new cell requires to have an exact copy of the DNA present in the old cell, this is important as cells divide.

Hence, the structure identified and conclude by the scientist is DNA (deoxyribonucleic acid). Thus, the structure of DNA is attached below.

Answer:

✓ The nucleic acid is DNA and would be found in the cell's nucleus

Explanation:

in what part of a chloroplast does glucose production occur

Answers

Answer:

the answer is stroma

Explanation:

ASAP
ATP is not involved with genetic information, it is an energy molecule. Why would we discuss it here with Nucleic acids?

Answers

Answer:

because nucleic acids are in living cells. they need energy to properly function especially in DNA and RNA.

Explanation:

explain the theorem used in solving for the range of possible lengrhs of the third side AB of ABC

Answers

The Pythagorean theorem is used when finding any sides of a triangle. The formula is (a times a )+(b times b)=(c times c). Please just plug the numbers in hear the c value has to be the hypotenuse. I can not give you the substituted formula if you say on AB

What property causes the cohesion of water molecules that moves water through a plant against the force of gravity?

Answers

Answer:

I believe the answer is polarity, though I am unable to find an exact statement.

Explanation:

I believe it is polarity because of the way water moves through a plant and its relation to gravity.

HELP IDK THE ANSWER SKSK

Answers

Answer:

The Goldilocks Zone?

Explanation:

The Goldilocks zone is a region that is close enough to the Sun to get the energy, and far enough to not burn up.

Answer: pretty sure thats right

Explanation:

Which of the following statements correctly describes the full value of a keystone species on its
ecological community?

First and Correct answer gets Brainly.

Answers

Answer: C

Explanation:

A keystone species helps to  define an ecosystem. The correct answer is option C.

What is the main purpose of a keystone species ?

It is that they help to hold the systems together. It will be difficult for the certain species to adapt to the changes that environment goes through.  

Keystone species are species which has the  significant and a large influence on community structure with the characteristics.  It is often considerably  with the  lower  abundance and  the biomass in comparison to dominant species. If  removed  such species can  cause  a serious disruption in  the structure with the function of  a community.

In  marine ecosystem  or other type of  an ecosystem in that case  a keystone species defines an  organism which helps to  hold system together.  Excluding such species, ecosystems will sound very different. Some of them might  not  adapt to environmental changes and  if the keystone species disappeared.

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How are mitosis and meiosis similar?
A. They both produce tetrads.
B. They both involve duplicating chromosomes
C. They both produce gametes
D. They both increase the chromosomes number.

Answers

Answer:

The answer is "B: They both involve duplicating chromosomes'

Explanation:

Which terms correctly identify the indicated structures in this
sketch of a cell viewed under a microscope?
Drag and drop a term to match each label.
Cell wall
Chloroplasts
Endoplasmic reticulum
Gogli apparatus
Large central vacuole
Lysosome
Mitochondrion
Nucleus
Plasma member
Vesicle

Answers

Answer:

Correct answers:

1

Gogli apparatus

2

nucleolus

3

endoplasmic reticulum

4

mitochondrion

5

ribosome

6

lysosome

Explanation:

just took the test hope this helps :)))))

The terms that correctly identify the indicated structures in this sketch of a cell viewed under a microscope are as follows:

A: Large central vacuole.B: Mitochondrion.C: Cell wall. D: Chloroplast.E: Lysosome. F: Endoplasmic reticulum

What is a Microscope?

A Microscope may be defined as a type of laboratory instrument which is utilized to observe small things that are too small to be visualized by the unaided eyes. This type of instrument is typically used to view cellular functions and structures.

A large central vacuole accounts for almost 90% of the plant cell volume. The Cell wall of the plant is made up of cellulose. Mitochondria deliver energy that is needed by the cell in order to accomplish metabolic activities. A Chloroplast is a membrane-bound cell organelle that facilitates the process of photosynthesis.

Therefore, the terms that correctly identify the indicated structures in this sketch of a cell viewed under a microscope are well mentioned above.

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if anyone could help. ive been on forever!​

Answers

Answer:

I'm not 100% but I think it's A

Which statement describes one feature of chemical changes? They never change a substance’s properties. They change a substance’s identity. They can usually be reversed. They keep a substance’s arrangement of atoms the same.

Answers

They change a substance’s identity.

Answer:

They change a substance’s identity.

Explanation:

How is the scientific theory developed

Answers

Answer:

The development of scientific theories A scientific theory is a general explanation that applies to a wide range of situations and examples. As technology develops more data can be collected and new types of observations made. A hypothesis is a testable explanation of an observed event.

Explanation:

The Chihuahuan Desert of the United States and Mexico may be the most biologically diverse deser in the world. Extensive grazing has caused the flora and soil of this ecosystem to become unstable. How has biodiversity affected the sustainability of this ecosystem? A Biodiversity has put this ecosystem at risk of being less sustainable in the future.
B Biodiversity has not changed this ecosystem's level of sustainability.
C Biodiversity has prevented this ecosystem from being sustainable.
D Biodiversity has helped this ecosystem remain sustainable.​

Answers

Answer:

A

Explanation:

Biodiversity has this ecosystem at risk of being less sustainable in the future, because it exposes the land to drought and other adverse conditions not supporting biodiversity in the future.

What could the nitrogen cycle not exist without?

Answers

Answer:

Microbes.

Explanation:

Microscopic organisms break down dead things and release the nitrogen back into the soil and atmosphere.

How many layers does earths atmosphere have

Answers

Answer:

7

Explanation:

The atmosphere is comprised of layers based on temperature. These layers are the troposphere, stratosphere, mesosphere and thermosphere. A further region at about 500 km above the Earth's surface is called the exosphere.

Substance A has a mass of 5 g and a volume of 5 g/cmº. What is the Density?

Answers

Density is equal to mass/volume

Therefore D = 5 g / 5 g/cm. The density is 1 gram per cubic centimeter (cm^3)

A meter stick or meter tape is used to measure the length, width, or height of an object. A meter stick is most often divided and labeled with numbers representing what unit?
A) centimeters.
B) meters.
C) milliliters.
D) millimeters.

Answers

Answer:

a centimeters

Explanation:

I think this is right. has both centimeters and millimeters but centimeters are labeled

Answer:

A) centimeters.

Explanation:

do woody stems die off each winter and grow back the next spring

Answers

no they can survive the winter

please help please help please help please help please help please help please help please help please help please help please help please help please help please help \

Answers

Answer:

D

Explanation:

Groups of cells working together are called tissues.

Happy Halloween!

Answer:

d

Explanation:

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