Answer: Calcium
Explanation: The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust. The metal is trimorphic, harder than sodium, but softer than aluminium.
Hope this helps. pls mark me brainliest :)
Describe the structure of an atom. Be sure to include the terms nucleus, electron cloud, protons, neutrons, and electrons in your description
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.
Which elements do not normally form compounds?
A. nonmetals
B. alkali metals
C. metalloids
D. noble gases
Answer:
D. noble gases
Explanation:
l hope it helps
Please help!
Geologists determine the hardness of a mineral using the Mohs scale of hardness. Why is it important for geologists to be able to do these tests in the field?
Answer:
To help determine what type of rock it is
Explanation:
Geologists can use information such as color, hardness, grain size, texture and other aspects of the rock to figure out the classification of a rock. for example, a light blue rock with no visible grain that is translucent and has a hardness of 9 is most likely going to be a saphire. hope this helps!!!!
In which ocean zone does a reef most likely thrive?
What periodic element is from france
Answer:
Francium
Explanation:
I really don't know how to explain this
Which of these can be combined to make a mixture?
a. solid and a liquid
b. two solids
c. two liquids
Answer:
c
Explanation:
you cant mix a rock and a rock together and expect to get a mixture
and you cant mix a rock and water and expect them to mix
so its on logical that it is two liquids
Why are lysosomes important?
When a cell is beyond repair, lysosomes help it to self-destruct in a process called apoptosis.
Answer: A lysosome is a membrane-bound cell organelle that contains digestive enzymes soooo. They break down excess or worn out cell parts, they may be used to destroy invading viruses and bacteria. If the cell is damaged beyond repair, lysosomes can help it to self-destruct in a process called programmed cell death, or apoptosis.
Explanation: So that's why it is important
(Dear brainly, you can't delete this question caue its about school work too)
(Flair?) I failed my siecne mindterm with a 50%, can pass that class? (My total grade is a 90.5%)
Answer:
70% to 100% is the highest grade, a mark of Distinction. 60% to 69% earns a Merit. 50% to 59% is Pass.is what im guessing and if your grade is 90.5 and has lowerd or hasn't that is ok because it might lower to a c but i advise to work better and if it is just a 90.5 overall including the test score that is fine nbut you will pass is what im think
Explanation:
Try better next time :) hope i help so you pass im ptretty sure and if you dont just be a tryhard
can anyone help me with the question?? “Is the ending substance the same substance as the colorless liquid and why”
Answer:
It's Gas.
Explanation:
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?
Answer:
1.61 g/cm³.
Explanation:
The image shows a projection map.
Which type of map is this?
flat model, Mercator projection
flat model, conic projection
highly distorted model, Mercator projection
highly distorted model, conic projection
Answer:
A. flat model, Mercator projection
Explanation:
I just took the test :]
HELP! A bone contains 6.25% of Carbon -14 it began with. How old is the bone ?
Answer:
6.25 yrs
Explanation:
The is the part of the electrical circuit along which electricity travels.
_________ ________________ is a circular path of electric current, from the source of energy and back.
The flow of electric charge through a path is called an
A form of energy is _________________.
The ___________ uses electricity from the source.
Please help for brainlest
Answer:
The conductor runs a circular path from the power source, through the resistor, and back to the power source. The power source moves the existing electrons in the conductor around the circuit. This is called a current. Electrons move through a wire from the negative end to the positive end.
Explanation:
this help?
PLEEASEE HELP ITS PAST DUE AND IM GIVING BRAINLIEST
Which process is an example of a physical change?
a. wood burning in a camp fire
b. iron rusting on a bicycle chain
c. ice melting after a snow storm
d. milk souring because it is old
Answer:
c or d
Explanation:
i dont know which one but it's one of those
PLEASE HELP MEEEE THIS IS ABOUT BODY SYSTEMS
The most common way humans contribute to the extinction of organisms is by
rotation of crops.
use of fertilizers.
destruction of habitat.
introduction of competing species.
The most common way humans contribute to the extinction of organisms is by destroying their habitats. By destroying the natural habitats of organism we are leading them to point where they cant survive.
What is extinction ?Extinction of an organism is the gradual disappearance of the entire species of that organism due to natural calamities, human activities or, spreading diseases.
Human activities are the main culprits of the devastation of organisms and their habitats. Humans destroy the natural habitats of plants and animals for their selfish purposes.
Animals then starve and they are not fit to survive in other places which are entirely different from their natural habitat. Therefore, if these activities continues they will extinct.
Find more on extinction?
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What is one advantage of developing energy-efficient technologies?
Answer:
it's simple
Explanation:
For residential buildings, a whole-house approach using a cost-effectiveness criterion can result in savings of 50 percent or more in heating and cooling and 30–40 percent reductions in total energy use.
I hope you understand have a great day :3
]Why is permeable soil best for plants that need a lot of drainage?
Water fills this type of soil.
Water dries up in this type of soil.
Water flows through this type of soil.
Water pools on top of this type of soil.
What kinds of anthropogenic activities produce acid rain?
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:
explain why the sun appers to be the brightest star in the sky. relate your explanation with an example such as street lights. this is science
Answer:
The sun is a star but It is the brightest in the sky because it is the closest star to earth.
I don't know how to compare it to street lights though...
Explanation:
a) monday & thursday
b) wednesday & saturday
c) tuesday & saturday
d) saturday & sunday
Answer: b
Explanation: 5*2
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.
Answer:
The answer is C
Explanation:
Can you mark me the Brainliest it helps a lot
What element glows in sign's when excited
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.
Ten of the sixteen nonmetals are _____ at room temperature.
A. solids
B. gases
C. alloys
D. liquids