hello :) for qn 3 , I got 0.01 mol but I’m not sure if it’s correct :/ I need help , thanks!
Answer:
0.05 dm³
Explanation:
Please see the attached picture for full solution.
The question is asking for the volume of H₂SO₄, so we need to find the number of moles of KOH then the number of moles of H₂SO₄. (Using mole ratio from the balanced equation) Also, potassium hydroxide is KOH not K₂SO₄ :)
Betty drew the life cycle of a butterfly for a science exhibition. The life cycle showed the various stages of growth before the egg turns into a butterfly. What type of model did Betty use?
Answer:
Conceptual
Explanation:
A conceptual models are graphical representation of the biological or physical system or another natural phenomenon. It is helping people to understand, imitate and make connections with natural phenomena. The given situation is an example of a conceptual model because it is represented in a graphical way and represents the basic biological events of the actual transformation of a butterfly (transforming a young adult insect into a young adult worm).Answer:
Conceptual
letter B
Wich tools are appropriate to determine the densety of an irregular-shaped object ?
Answer:
The most accurate way to determine an object's volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. A graduated cylinder large enough to hold both the object and enough water to fully immerse it is the best tool for this job.
Which of the following best specifies the purpose of error bars on a graph? To show the mean of a data set. To identify the independent variable. To give a visual display of measurement precision. To indicate the total number of measurements that are made.
Answer:
c
Explanation:
To give a visual display of measurement precision best specifies the purpose of error bars on a graph.
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.The experiments must be done with utmost care to minimize the range of errors.
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what is a compound x in chemistry?
Answer:
no there is not compound x in chemistry
What SI units are used for measuring the following quantities? For derived units, express your answers in terms of the six fundamental units. please help :(
volume, density, and energy
Answer:
volume it's SI unit is cubic centimeters or cubic meters
density grams per cubic centimeters
When heating test tubes, always slant them away from yourself and others.
True
False
Answer:
true
Explanation:
mass , volume, and density are all properties of what
Answer: Physical properties
Explanation: Can be measured without changing a substance's chemical identity.
How does quantitative data apply to the scientific method?
What is mass in grams of 300 ml of salt water with a density of 1.30 grams per centimeter cubed
Answer:
The answer is
390 gExplanation:
The mass of a substance given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
Density = 1.30 g/cm³
volume = 300 mL
Substitute the values into the above formula and solve
That's
mass = 1.3 × 300
We have the final answer as
390 gHope this helps you
how many grams in 5mg
Answer:
0.005
Explanation:
I looked it up
Explanation: It's important to understand that "mg" is the abbreviation
for milligrams and "g" is the abbreviation for grams.
To convert 5 milligrams into grams, we first find the conversion factor
for milligrams and grams, which is 1,000 milligrams = 1 gram.
Next, notice that we're going from a smaller unit,
milligrams, to a larger unit, grams, so we divide.
Whenever we go from a smaller unit to a larger unit,
we will divide by the conversion factor.
So we have 5 mg ÷ 1,000.
When dividing by a power of 10, we can count the number of zeroes
in the power of 10 and move the decimal point that many places to the left.
So our answer is 0.005 grams.
7. A square chunk of plastic has a length of 5 cm, width of 5 cm and height of 5 cm. It has a mass of 200 g. What is its density?
Answer:
[tex]d=1.6\ g/cm^3[/tex]
Explanation:
Given that,
The dimension of a square chunk of plastic is 5 cm × 5 cm × 5 cm
Mass, m = 200 g
We need to find its density
Density = mass/volume
It will form a cube. It volume = side³
So,
[tex]d=\dfrac{200\ g}{5^3\ cm^3}\\\\d=1.6\ g/cm^3[/tex]
Hence density is [tex]1.6\ g/cm^3[/tex]
you have a lead ball with a mass of 420 g. the density of lead is 10.5 g/cm³. what is the volume of the ball
Answer:
The answer is
40.0 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 = 420 g
density = 10.5 g/cm³
The volume is
[tex]volume = \frac{420}{10.5} \\ [/tex]
We have the final answer as
40.0 mLHope this helps you
(a) Convert the following:
50 cm into m
Answer:
0.5m
Explanation:
how do i convert 0.5L to mL
Answer: 500
Explanation: there's 0.001L in every mL. Divide the mL
by 1000 or multiply the liter by 1000.
Identify how many significant figures each number has. a. 297 b. 549 c. 4678 d. 327 e. 3006 f. 902 g. 8020 h. 0.0000053 1. 0.00002 j. 0.000506 k. 4000 1. 4000.0 m. 7.12 n. 3.05
Explanation:
a. 3 significant figures
b. 3
c. 4
d. 3
e. 4
f. 3
g. 3
h. 2
i. 1
j. 3
k. 1
l. 6
m. 3
n. 3
What is the main source(s) of energy for all living things?
Answer:
The sun
Explanation:
All living things get energy from different sources (a cow gets it from grass, dog gets it from meat), but eventually, most energy on Earth comes from the Sun. Plants use it to perform photosynthesis, other organisms eat plants, and so on!
Something made of all one material
Answer:
element
Explanation:
an element is something made up of only one type of atom
PLEASE HELP
what determines an elements properties?
A. the valence electrons
B. its atomic mass
C. the core electrons
D. the isotopes it forms
Answer:
A
Explanation:
Answer:
A. the valence electrons
Explanation:
The picture represents sulfur trioxide which statement is true for one molecule of sulfur trioxide? A there are three atoms of sulfur and one atom of oxygen B there are three atoms of sulfur and three atoms of oxygen C there is one atom of sulfur and one atom of oxygen D there is one atom of sulfur and three atoms of oxygen
Answer:
The correct answer is D
Explanation:
I took the test and got i correct. :) have a good day!
How does the interior of the earth affect the exterior of a volcano? Explain.
Answer:
it erupts
Explanation:
what is the molecular geometry of SCN- using the electron pair repulsion model?
Which most accurately describes the basis of the scientific method?
A. a path of clearly defined steps that must be followed in a particular order.
B. a possible answer to a scientific question based on knowledge or research.
C. the recipe for how to conduct an experiment that must be followed precisely.
D. the process of hypothesis and testing through which scientific inquiry occurs.
The answer is D: process of hypothesis and testing through which scientists inquiry occurs
Answer:
d edge 2020
Explanation:
Claudia performed a flame test in her lab. The result of her flame test is shown here.
Answer:
Where is the results and what is the question or is there a picture
Explanation:
What’s is the specific gravity of turpentine
Suppose a mountain range is made up of 18 mountains, each mountain has
8800 trees on it, and each tree has 125,000 leaves on it.
How many leaves are
on all of the trees in the mountain range? Express your answer in scientific
notation.
The answer is 1.98 x 10^10 leaves.
18 mountains x 8800 trees = 158400 total trees
158400 total trees x 125000 leaves = 19800000000 total leaves in entire mountain range
Sci not: 1.98 x 10^10 leaves
To do scientific notation, put the decimal place right after the first digit in the number and count how many places are behind the decimal. you'll write the number of places after the decimal after the ^ in the 10^.
A car accelerates from 0 to 72 km/hour in 6.0 seconds. What is the car's acceleration?
The acceleration of the car is equal to 3.33 m/s² with a velocity of 72 Km/hr.
What is acceleration?Acceleration can be demonstrated as the rate of change of velocity over time. The acceleration can be explained as vector quantity due to both magnitude and direction. Acceleration is defined as the 2nd derivative of the position of the object w.r.t. time.
According to Newton's 2nd law of motion, the force exerted is equal to the mass times of acceleration of an object.
a = F/m
or, a = dv/dt
Given, the final velocity of the car, v = 72 Km/hr
v = 72 × 1000/3600 m/s
v = 20 m/s
The time is taken by car to travel, t = 20 s
The acceleration of the car, a = (20 - 0)/(6 - 0)
a = 3.33 m/s²
Therefore, the acceleration of the car is 3.33 m/s².
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Which pair of elements in the diagram is most likely to form a covalent bond?
Answer:
This question is incomplete
Explanation:
This question is incomplete. A covalent bond is a bond that involves the sharing of valence electrons (shared pair) by two atoms of the same/different elements/compounds. The electrons (valence) that are involved in covalent bonding are not the ones in pairs (lone pairs) on the outermost shell of the atom. For example, the single electron on a hydrogen atom is shared with another hydrogen to form hydrogen gas (H₂).
Another example is when the two individual/unpaired electrons on the outermost shell of an oxygen atom binds with two other unpaired electrons on the outermost shell of another oxygen atom.
Another example is when two different electrons from two hydrogen atom binds singly with the two unpaired electrons on the outermost shell of an oxygen atom to form water.
The diagram in the attachment provides illustration on the examples given.
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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If one gram of water has a volume of one milliliter, what would the mass of one liter of water be in kilograms?