7th grade Sem 1
13.2.6 Quiz: Chemistry of Life
Question 3 of 5
Which substance used during photosynthesis does a plant take in from the
soll?
A. Water
O
B. Sugars
C. Proteins
D. Oxygen
SUBMIT
Answer: Water
Explanation: During photosynthesis, plants take in carbon dioxide (CO2) and water (H2O) from the air and soil
The energy of motion is known as potential energy.
Question 1 options:
True
False
Answer:
False
Explanation:
This is because potential energy is energy that it not used yet.
a substance composed of two or more metals.
Answer:
A substance composed of two or more metals is called an alloy
Explanation:
A high pressure system generally indicates?
Question 9 options:
tornadoes
rain
fair weather
an amount of nitrogen undergoes a physical change and increases its volume. What can be known about this physical change? The boiling point of the nitrogen increased. The mass of nitrogen increased. The color changed. The density changed.
Answer:
it was a chemical reaction
Explanation:
D
Explanation:
is the answer
How do we get mass from moles?
Please help with chemistry!
Answer:
name is Ian symbol is spices mass number is 100
Explanation:
#
An octopus swims 7 km at a speed of 3 km/hr.How long does it take in hours and minutes?
Answer:
your question is not correct
PLEASE HELP! Which rock is an example of a chemical sedimentary rock?
coal
iron ore
shale
sandstone
Answer:
sandstone
Explanation:
Answer: iron ore
Explanation: The iron ore deposits are found in sedimentary rocks. They are formed by the chemical reaction of iron and oxygen mixed in the marine and fresh water.
if an atom has 8 protons, 8 neutrons, and 8 electrons and then loses a neutron, what is it?
Answer:
A Cation
Explanation:
Think of a time you might have used the scientific method without even realizing it.
Answer:
when i exist
Explanation:
PLZ HELP
Observe: To model how hydrogen and oxygen react to make water, type “H2+O2” into the Reactants box and “H2O” into the Products box.
As the equation is written, which element is not in balance? ________________________
Explain: __________
Answer:
Observe: To model how hydrogen and oxygen react to make water, type “H2+O2” into the Reactants box and “H2O” into the Products box.
As the equation is written, which element is not in balanced?
oxygen isn't balanced...
Explanation:
in reactants there is 2hydrogens and 2 oxygen
but in product there is balanced no if hydrogen bt there is only one no of oxygen
Chemical Formula:
4Ca(OH)2
In the chemical formula above, how many different types of elements are present in a molecule of this formula?
Answer:
They are just two....Ca and OH
what does it mean to say that density is a characteristic property of a pure substance
Density is the degree of the heaviness of a particular substance.
Density can also be defined as the unit mass of a substance per the substance's volume.Density is said to be the characteristic property of a pure substance because the density of a pure substance is constant and fixed
Pure substances are substances that are homogenous in nature, which means they are uniform and are made up of only one component.Density is said to be the characteristic property of a pure substance because the density of a pure substance is constant and fixed but its mass and volume can vary.To learn more, visit the link below:
https://brainly.com/question/11208248
using the standard enthalpies of formation, what is the standard enthalpy of reaction?
Answer:
This equation essentially states that the standard enthalpy change of formation is equal to the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. and the standard enthalpy of formation values: ΔH fo[A] = 433 KJ/mol.
Explanation:
Hope this helps.
Help pls What have you taken away from the work of Stephen Hawking?
When Stephen Hawking was diagnosed with ALS at age 21, he knew he had little time left. But he also knew he wanted to do so much more first. With these circumstances, he learned the importance of carpe diem .
Magnesium has an atomic (proton) number of 12 and a mass number of 24.
How many magnesium atoms are there in 2 moles of magnesium? HELPPPPP
Answer:
1.2044x10^24 atoms
Explanation:
one mole of any element has 6.022x10^23 atoms
so 2 moles is just multiplying avogadros number by 2
2 x ( 6.022x10^23)= 1.2044x10^24 atoms
Someone pls help me I will make you brain
Match them plsss
Answer:
carbon monoxide - B
nitrogen oxides - D
particulate matter - A
sulfur oxides - C
Explanation:
not sure if i'm fully correct though
Answer:
Carbon monoxide is (B)
Nitrogen oxides is (D)
particulate matter is (A)
sulfur oxides is (C)
Explanation:
sorry if I did it wrong
Someone pls help me I will make you brain
Answer:
D cooler temperatures
Explanation:
Make me b r a i n please
is lithium a good or bad element? (explain why)
Answer:
Its good
Explanation:
It has power
Answer: The widespread occurrence of lithium in plants results in a wide, although low-level, distribution of lithium in animals. Lithium salts have complex effects when absorbed into the body. They are not highly toxic, although high levels can be fatal.
Explanation: Which means that lithium is a good element depending on levels.
Calculate the mass of a substance which has a volume of 35
cm3 and a density of 0.500 g/cm3. Make sure your answer
has correct significant figures.
The answer is 17.5kg.
To get the mass of an object you do Volume × Density. The SI unit of Mass is "kg."
ch3cooh + naoh ?????????????
Answer:
CH3COOH+NAOH=.>CH3COONA+H20
Explanation:
Why is boiling water considered a physical change
A nickel compound has the formula Ni(NO3)2•xH,0 and a molar mass
of 290.7 g mol-1. Calculate the value of x.
Someone tell me the method for this
Explanation:
Molar mass of a compound is the sum of the molar mass of all the atoms of the compound.
⇒ Molar mass of the Nickel Compound (Hydrated Nickel (II) Nitrate)
= Molar mass (Ni+ 2N + 6O)+ x (2H+ O)
= [58.693 + 2(14.007) + 6(15.999)] + x [2(1.008) + 15.999] g/mol
= (182.701 + 18.015x) g/mol
Since the molar mass is known to be 290.7 g/mol
then 182.701 + 18.015x = 290.7
⇒ 18.015x = 290.7 - 182.701
x = (290.7 - 182.701) ÷ 18.015
∴ x = 6 [conventionally expressed as a whole number]
that makes the compound Nickel Nitrate Hexahydrate
The value of x in the hydrated compound of nickel nitrate with molecular mass 290.7 g/mol is 6.
What is the molecular mass?Molecular mass can be defined as the sum of the mass of each element in the compound.
The molecular mass of the given compound is 290.7 g/mol. The value of x in the compound can be given as;
[tex]\rm 290.7\;g/mol=2(Ni)+2(N)+2(3O)+x(2H+O)[/tex]
Substituting the mass of N, Ni, O and H for the calculation of x as:
[tex]\rm 290.7\;g/mol=(58.693)+2(14.007)+2(3(15.999))+x(2(1.008)+15.999)\\290.7=182.701+18.015x\\x=6[/tex]
The value of x in the hydrated compound of nickel nitrate is 6.
Learn more about molecular mass, here:
https://brainly.com/question/14327882
the energy level model of the atom was proposed by
Answer:
Niels Bohr
Explanation:
Which of these is caused by bacteria? A) tuberculosis B) influenza C) the common cold D) chicken pox
Answer:
The answer is A Tuberculosis
PLEASE LHELP
How many oxygen atoms are in 6 Carbon dioxide compounds (6co2)
Number 5
PLEASEE HELP
Answer:
12
Explanation:
6 moles multiplied 2 atoms of O2
That gives 12 atoms
Cual es la convención de 746 Hm
Answer:
75.6
Explanation:
756x0.1=75.6
1 d =hm=0.1
Potential energy is energy that is stored in an object. It isn't being used at the moment, but is waiting to do work. A good example is to think about a boulder sitting on top of a hill. Just sitting there, the boulder isn't doing anything. But because it is sitting on top of a hill, it has the potential to roll down and do some damage to a car or building below. The energy is stored in that rock because of its size (mass) and the distance it will travel once it starts rolling. Another good example is a rubberband. When you stretch a rubber band, it wants to move back to its original position, and thus you have given it potential energy. As the rubber band is released, potential energy is changed to motion.
Kinetic energy is energy of motion. A rubber band flying through the air has kinetic energy. When you are walking or running your body is exhibiting kinetic energy. This energy is performing work. Other examples of kinetic energy include: legs pump bicycle pedals, lightning snaps trees, cars travel down the street, football players making tackles, and 4-wheelers speeding through the woods.
Potential energy is converted into kinetic energy. As mentioned before, a stretched rubberband can change from having potential to kinetic energy. Another example of this change between kinetic and potential energy can be seen using a yo-yo. Before a yo-yo begins to fall from your hand it has stored energy due to its position. At the top (in your hand) it has its maximum potential energy. As it starts to fall the potential energy begins to be changed into kinetic energy. At the bottom its potential energy has been completely converted into kinetic energy so that it now has its maximum kinetic energy. Another example of the change between kinetic and potential energy is a waterfall. A waterfall has both potential and kinetic energy. The water at the top of a waterfall has stored potential energy. When the water begins to fall, its potential energy is changed into kinetic energy. This change in energy is used in Niagara Falls, Canada to provide electricity to parts of the northeastern United States.
Questions:
1. What is kinetic energy?
2. What is potential energy?
3. List 5 examples of Potential energy given in the above passage. The first two are filled in for you.
1. __A boulder sitting on top of a hill that could roll down.___________ 2. __A stretched rubberband.___________________________________ 3. ________________________________________________________ 4. ________________________________________________________ 5. ________________________________________________________
4. List 5 examples of Kinetic Energy given in the passage above. The first
two are filled in for you.
1. __Water falling down a waterfall.____________________________ 2. __Car moving through the streets.____________________________ 3. ________________________________________________________ 4. ________________________________________________________ 5. ________________________________________________________
Answer:
it's all in the passage
Explanation:
read over the passage and find the answer i promise they're in there.
Cumulus Clouds are _______ ______ clouds with __________ bases.
Answer:
Cumulus Clouds are __puffy _____ clouds with ___flat _______ bases.