Answer:
independent variable- instrumental music
dependent variable- Number of stacks of papers made
experimental variable- Group A has instrumental music
playing
constant- same task,
Explanation:
Zinc reacts with hydrochloric acid according to the reaction equation Zn(s)+2HCl(aq)⟶ZnCl2(aq)+H2(g) How many milliliters of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s)?
Answer:
41.17
Explanation:
n Zn = mass / m.wt
= 8.75 /(65.4) = 0.1338 mole
n HCL = ( from the balanced equation )
2HCL Zn
2mole → 1 mole
x mole → 0.1338mole
n HCL = .268 mole
M= mole/liter
6.50= 0.268/x
so u have0.04117 liter = 41.17 ml
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
number of moles of zinc= mass / molecular mass
= 8.75 /(65.4) = 0.1338 mole
number of moles of HCl ( from the balanced equation )
2 moles of HCl reacts with one mole of Zn
number of moles of HCl = 2×0.1338 =0.268 mole
Molarity = number of mole of HCl/volume occupied by solution
6.50= 0.268/volume
Volume of HCl = 41.17 ml
Therefore, 41.17 ml of 6.50 M HCl(aq) are required to react with 8.75 g Zn(s).
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29.4 mL of an CH3COOH solution were titrated with 18.5 mL of a 0.0175 m LiOH solution to reach the equivalence point. What is the molarity of the CH3COOH solution
Answer:
0.11 M
Explanation:
The computation of molarity of the CH3COOH solution is shown below:-
[tex]M_2 = \frac{M_1V_1}{V_2}[/tex]
Where,
[tex]M_1[/tex] = Molarity of LioH = 0.0175
[tex]V_1[/tex] = Volume of LioH = 18.5 ml
[tex]V_2[/tex] = Volume of CH3COOH = 29.4 ml
Now, we will put the values into the formula
[tex]= \frac{0.0175\times 18.5}{29.4}\\\\ = \frac{0.32375}{29.4}[/tex]
Which gives result
= 0.011 M
Therefore for computing the molarity of the CH3COOH solution we simply applied the above formula.
Answer: 0.11
Explanation:
What lead to the discontinued use of DDT? What were its effects on people? Nature? People- Nature-
An unknown solid has a mass of 837.21 g. The volume of the solid, determined by water displacement is 37.00 mL. Calculate the density of the solid.
Answer:
The answer is
22.63 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]
From the question
mass = 837.21 g
volume = 37.00 mL
The density of the substance is
[tex]Density = \frac{837.21}{37} \\ = 22.62729[/tex]
We have the final answer as
22.63 g/mLHope this helps you
If Mr. Murchison is testing out how the light in his classroom affects how sleepy his students get, what should his dependent variable be?
Answer:the dimmer the light is,the more sleepy the students become
Explanation:
Which of the following has a negative charge? A.neutrino B.electron C.alpha particles D.gamma rays
Answer:
B. Electrons
Explanation:
Protons have a positive (+) charge.
Neutrons have a neutral (0) charge.
Electrons have a negative (-) charge.
Alpha Particles is a helium atom.
Gamma Rays are radiation.
Neutrino is Quantum Physics.
help me plz, ASAP . (25 points)
Answer:
what is the question
Explanation:
plastics
shells
aluminum
cans
drift
wood
sea
weed
glass
This chart illustrates the type and number of items collected during a clean up of a
beach. Based on the chart, what approximate percentage of the total items result
from the action of people?
A recycling center must find a way to separate all of the aluminum cans from those made of nickel or iron. What would be a reliable, efficient way to separate them?
Answer:
Use a giant magnet to pick up the iron and nickel ones, leaving the aluminum behind.
Explanation:
Stay safe!
How to calculate the amount of water needed to dilute a solution?
Answer:
Suppose you must prepare 400 ml of a disinfectant that requires 1:8 dilution from a concentrated stock solution with water. Divide the volume needed by the dilution factor (400 ml / 8 = 50 ml) to determine the unit volume. The dilution is then done as 50 ml concentrated disinfectant + 350 ml
Living sustainably means living on ____—the renewable resources such as plants, animals, soil, clean air, and clean water provided by Earth's natural capital. A. Exponential growth natural income ecosystem services factors of sustainability biodiversity
Answer:
natural income
Explanation:
Living sustainably in the 21st century means coexisting with the nature. In other words, to live sustainably means to meet the needs of the human without affecting or degrading the mother nature.
In the context, living sustainably means to live from the natural income from the nature's gift to us, using their natural resources and not hurting them or exploiting them. They may be resources from the soil, plants, clean air, animals, nature's clean water,etc.
Which event always involves a chemical change A boiling B melting C conducting D burning
Answer:
burning
Explanation:
When a chemical change occurs, the matter is transformed into a new substance. When a substance is burned, it will change into something new. Thus, you know that burning is a chemical change. All the other options are physical properties. The substances may change state, but they will not change identities.
- I took the quiz and got 100%
Hope this helps!
HELP! WILL GIVE BRAINLY!!!
Density is an intensive physical property because the density of a given substance does not change with the size of the sample. (2 points)
True
False
Answer:
True
Density = mass/volume
Suppose that a block has a mass of 20 g and a volume of 20 cm^3.
Density = 20 g/20 cm^3 = 1 g/cm^3
Now, you cut the block in half. The half-block has a mass of 10 g and a volume of 10 cm^3.
The density of the half-block is
Density = 10 g/10 cm^3 = 1 g/cm^3
The density stays the same, even though the size of the sample has changed.
Explanation:
Answer:
✅True
Explanation:
Density is an intensive physical property because the density of a given substance does not change with the size of the sample.
IamSugarBee
Who want to see me with another kid in 2021? What are some great baby names for boy's and girl's?
*plz don't delete dis question****
Answer:
Artemis Mae (girl)
Apollo Kay (boy)
Kayden Jade (girl/boy)
Karyissa Reyna (girl)
Poseidon Sea (boy)
Zeus Sky (boy)
Iris Hebe (girl)
Faye Ares (girl/boy)
Amphitrite Hera (girl)
~Lylliara~
TIME REMAINING
01:29:12
Which technology has helped improve scientists' ability to gather scientific data about the movement of sea turtles?
O satellite tracking
O thermometers
O probeware
microscopes
the first one satellite tracking
Answer:
I believe the answer is A. Or the 1st dot.
Explanation:
⁴₁₂Mg and ²⁴₁₂Mg⁺² can be defined as
isotopes
different elements
ions
average atomic masses
ions because it’s still the same element, however the charge has changed
what is a compound x in chemistry?
Answer:
no there is not compound x in chemistry
Is the copper in a copper wire a homogeneous or heterogeneous mixture
Which statement accurately describes the chemical symbol of an element?
O The chemical symbol is always a single letter.
O The chemical symbol always starts with the same letter as the name of the element.
O The chemical symbol always begins with a capital letter.
OThe chemical symbol can be shared by more than one element.
Answer:
The chemical symbol always begins with a capital letter.
Explanation:
Answer:
c
Explanation:
The chemical symbol of an element always starts with an chemical letter so here the answer is that the chemical symbol always begins with a capital letter.
It can be seen in the different elements chemical symbol .
For example, Tin is having chemical symbol as Sn while lead is having chemical symbol as Pb.
In both these elements, the chemical symbol starts with a capital letter but none of these have their symbol starts with same letter as their name.
If one end of an iron bar is heated, what causes thermal energy to transfer to the other end? a radiation b conduction c heat of fusion d convection
Answer:
Option B:
Conduction
Explanation:
Conduction is the transfer of heat from one molecule to another between two solids that are in direct contact with each other. For the conduction of heat to occur, the medium involved must be solid. This is because the molecules of solids are closely packed together and they cannot freely move about. The heat flowing through them can easily be passed on from one molecule to the other until it reaches all the parts of the object. This is exactly what will happen to the iron bar. Thermal energy from one end of the bar will get transferred between the molecules of the iron bar until it reaches the other end.
Convection on the other hand involves the transfer of heat through a liquid medium.
Radiation involves teh transfer of heat in a vacuum.
Answer:
b) conduction
Explanation:
What are two examples of a chemical change
Answer:
1.Cooking an egg
2. Burning wood
Hope it helps :)
tony ate 3/4 of the pizza. mike ate 7/16 of the pizza. how much more did tony eat than mike
Answer:
5/16
Explanation:
make them have a common denominator
3/4 needs to be times by 4
so it's
12/16 then you minus 7/16
the answer is
5/16
Answer: 5/16
Explanation:
Multiply tonys 3/4 by 4 in order to get the same denominator as mike's 7/16. You should get 12/16 since 4x3=12, and now you can subtract the smaller fraction 7/16 from the bigger one 12/16, you should get a difference of 5/16.
Harvey mixes two liquids. Which observation of the new mixture most likely indicates a precipitate is O A. a cloudy appearance OB. a bubble formation OC. a change in color O D. a change in odor
Answer:
A cloudy appearance!!
Explanation:
Hope it helps, just took a quiz.
Answer:
a cloudy appearance
Explanation:
i have big brain
rabbit is one of the sweetest animal on world ....change it into positive degree
Answer:
rabbit is one of the sweet animal
in the world
The second part of the cell theory is that he cell is the smallest unit of _______ and _______ in living things
Answer:
a.life
b.organization
Which substance is composed of only one type of atom? A: water B: sugar C: salt D: gold
Answer:
Gold
Explanation:
water = H2O(3 atoms)
Sugar = C12H22O11 (45 atoms)
Salt = NaCl ( 2 atoms)
Gold = Au ( 1 atom)
A substance that is composed of only one type of atom is gold. Thus, the correct option for this question is D.
What is an atom?An atom may be defined as the smallest unit of any matter that has the ability to form a chemical element. An atom may also be characterized as a particle of matter that uniquely illustrates a chemical element.
Water is composed of two atoms which are hydrogen and oxygen. Its chemical formula is [tex]H_20.[/tex] Sugar is a complex compound that consists of atoms of Carbon, hydrogen, and oxygen. Its chemical formula is [tex]C_6H_1_2O_6.[/tex] Salt typically consists of atoms of sodium and chlorine. Its chemical formula is NaCl.
Therefore, gold is a substance that is composed of only one type of atom. Thus, the correct option for this question is D.
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When heating test tubes, always slant them away from yourself and others.
True
False
Answer:
true
Explanation:
A substance has a density of 3.56 g/mL and a mass of 5668 g. What is the volume?
Answer:
The answer is
1592.13 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass of substance = 5668 g
Density = 3.56 g/mL
The volume is
[tex]volume = \frac{5668}{3.56} \\ = 1592.1348314[/tex]
We have the final answer as
1592.13 mLHope this helps you
The forces between water molecules are stronger than the forces between ethanol molecules. Which liquid would probably be most difficult for an insect to walk on?
A student says: Potassium (K) always has 20 protons. Explain why the student is incorrect.
Explanation:
19
Potassium/Atomic number
This tells you that potassium has 19 protons and - since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element. This can also be found in the periodic table.