Answer:
Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for a mass of 62.93 amu and 30.8% for a mass of 64.93amu. Calculate the average atomic mass of copper.
Answer:
63.546
Explanation:
The Average atomic mass is calculated using the formula:
sum of the product of the atomic masses and their relative abundances all divided by 100 or total abundance
Bread is made with which fungus?
morel
yeast
mold
chytrid
Answer:
yeast
Explanation:
sorry if incorrect
Which statement correctly compares the sun and planets? A. Planets have an atmosphere; the sun does not. B. Planets gives off energy; the sun does not. C. Planets orbit the sun; the sun is at the center of the solar system. D. Planets are all made of solid materials; the sun is made of gases.
Answer:
c
Explanation:
because the sun is at the center of the universe the planet orbit the sun its basically a simple answer so if you need more help im right here
The sun and the planets are part of the solar system. The sun is in the center of the system, and the planets revolve around it. Thus, option C is correct.
What is the solar system?A solar system is a part of the Milky Way galaxy that includes the planets, stars, sun, moon, asteroids, etc. The Sun is the star that is fixed at the center of the system.
The planets are not fixed and revolve in orbit around the sun and rotate on their axis. The sun and planets are made up of gases and have different atmospheres.
Therefore, option C. sun is at the center around which the planets revolve.
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What is a function of the backbone in animals
Answer:
The major function of the vertebral column is protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans an additional function is to transmit body weight in walking and standing.
Explanation:
MARK ME BRAINLIEST :)
Can you please help me !!
Answer:
Explanation:
A) O2 (non polar covalent)
B) HF (polar covalent)
C) NaCl (because its ionic)
im not 100% sure hope it helps
HELLLPP QUICK WILL MARK BRAINLIEST
Answer:
c
Explanation:
Why does everyone keep saying I should call Uraraka “red cheeks” instead of “pink cheeks” (=_=)
i dont know man they're weird
I need help with that.
Answer:
The three main cycles of an ecosystem are the water cycle, the carbon cycle and the nitrogen cycle. These three cycles working in balance are responsible for carrying away waste materials and replenishing the ecosystem with the nutrients necessary to sustain life.
Explanation:
cycles such as the water cycle keep the earth hydrated by feeding rain to trees, plants, etc.
Need help fast plzzz!!! Please help.
Answer:
1. 0.5333333m (Calculator Soup Work Calculator)
2.
9. 29.1666666667% efficient
10. 44.5% efficient
Explanation:
will do other answers later
Hydrogen is the first element on
the periodic table. How many
protons does it have?
A. one
B. 118
C. it varies
What is the volume of 55 grams of carbon dioxide at STP
A. 2.45 L
B. 28 L
C. 1.25 L
D. 12.5L
Answer:
A. 2.45 L - Answer my answers is right.
Which of the following pairs of elements is most likely to form an ionic bond?
A.
nitrogen and oxygen
B.
lithium and chlorine
C.
phosphorus and chlorine
D.
selenium and bromine
Answer:
B.
lithium and chlorine
Explanation:
Ionic bonds are typically formed between a metal and nonmetal. Lithium is an alkali metal in group one and chlorine is a halogen from group seven. They will bond to form the salt, lithium chloride.
Which two elements have similar properties and 8 electrons in their
outermost shells?
O A. Neon and argon
B. Fluorine and chlorine
C. Lithium and sodium
D. Magnesium and calcium
Answer:
A
Explanation:
because they both belong to the Same group eight
Need help will mark brainliest!!
huryyyyyy plsssssssssssssssssss
Answer:
B.
Explanation:
bc it goes from having the potential to move to moving sorry if im wrong tho
When a logger cuts down a
tree, what type of change is
happening to the tree?
A. Physical change
B. Chemical change
'C. Mixture change
Answer:
A
Explanation:
Answer:
A
Explanation:
The original chemical structure of the tree is not changing, therefore it is not a chemical change, and it is definetely not a mixture change, its a physical change.
In your own words, describe the process of convection.
Answer:
the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
Explanation:
<3
Answer:
Convection when heat travels through metal or appliances.
Explanation:
Vectors are arrows that tell us two things about force...WEIGHT and DIRECTION
True
False
How many moles of H2O(I) are formed from 3.85 mol of propane?
Answer:
15.4 moles
Explanation:
15.4 moles
how many protons does gold have
Answer:
gold has 79 protons
Explanation:
i looked it up lol
1. Make a prediction - Do you think water molecules speed up or slow down
when they are heated? *
Answer:
disminuyne
Explanation:
Which type of bonds does potassium form? Which type of bond is most
common?
Answer:
forms an ionic bond. Potassium and iodine have very different electronegativities. The two atoms would form an ionic bond since ionic bonds form between atoms with a large difference in electronegativity
Explanation: look it up
What is a unwanted change in the environment caused by substances or from of energy??
Answer:
pollution I think
Explanation:
Which of the following are examples of a physical property of matter? Select all that apply.
The matter is made up of various types of particles which have a physical state and have inertia.
What are the physical property of matter? Select all that apply.1. Matter is colour less. (false)
2. Matter is hard in structure. (true)
3. Matter is soluble. (true)
4. Matter can not conduct electricity. (false)
5. Matter has boiling point but not melting point. (false)
6. Matter has both boiling and melting point. (true)
7. Matter has not the density. (false)
8. Matter has the malleability. (true)
Matter is made up of different kinds of particles which can occupy space and they have some mass. All the matters are made up of the elements. The elements contain specific physical and chemical properties. the matter can not be broken by any ordinary chemical reaction.
So we can conclude that the matter is made up of various types of particles which have a physical state and have inertia.
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Dylan puts two magnetic toy trains very close to each other on a track. What will happen next, and why?
(science)
hurry help!!
All commonly abused drugs are illegal.
true or false
Answer:
False
Explanation:
Many abused drugs are prescription drugs.
The correct coefficients needed to balance the following reaction are:
___ PbI2 + ___ ZnS → ___ PbS + ___ZnI2
a) 1, 2, 2, 1
b) 1, 1, 1, 1
c) 1, 1, 2, 2
d) 2, 1, 1, 2
what is 15 /2.343*233+2341
if you are reading this you like the person you are sitting beside or just beside or will sit beside next.
Answer:
3832.67
Explanation:
in an experiment 3.425g of lead oxide was reduced to form 3.105g of lead the empirical formula of the lead oxide is?
Answer:
Pb3O4
Explanation:
According to this question, 3.425g of lead oxide was reduced to form 3.105g of lead in an experiment. Since lead oxide contains both lead (Pb) and oxygen (O) element,
Mass of lead oxide = 3.425g
Mass of lead = 3.105g
Mass of oxygen = (3.425g - 3.105g) = 0.320g
Next, we convert each mass value to mole by dividing by respective molar mass
Pb = 3.105g ÷ 207.2 = 0.0149mol
O = 0.320g ÷ 16 = 0.02mol
Next, we divide each mole value by the smallest (0.0149)
Pb = 0.0149mol ÷ 0.0149mol = 1
O = 0.02mol ÷ 0.0149mol = 1.342
Multiply each ratio value by 3 to get:
Pb = 1 × 3 = 3
O = 1.342 × 3 = 4.026
The whole number ratio, approximately, of Pb and O is 3:4, hence, their empirical formula is Pb3O4.
Which of the following is a standardized and convenient unit to use for comparing distances across the Solar System?
A
the distance from the Sun to Earth
B. the distance light travels in one year
C the distance Mercury travels in one year
D. the distance Earth travels around the Sun