Answer:
Hope it help you
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Plz mark my answer brainliest✍️✍️
Explanation:
There are three types of systems in thermodynamics: open, closed, and isolated. An open system can exchange both energy and matter with its surroundings. ... A closed system, on the other hand, can exchange only energy with its surroundings, not matter.
REAL NAME - SHRESTH DUBEY
5. What is a hypothesis and how is it used?
Answer: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
A hypothesis is used in an experiment to define the relationship between two variables. The purpose of a hypothesis is to find the answer to a question. A formalized hypothesis will force us to think about what results we should look for in an experiment. The first variable is called the independent variable
i hopes this helps :)
If a sample of copper is 215g, how many moles of copper atoms are in the sample?
Answer:
3.38 moles.
Explanation:
The following data were obtained from the question:
Mass of copper (Cu) = 215 g
Number of mole of copper (Cu) =...?
The number of mole of copper (Cu) in 215 g can be obtained as follow:
Mass of copper (Cu) = 215 g
Molar mass of copper (Cu) = 63.55 g/mol
Number of mole of copper (Cu) =...?
Mole = mass /Molar mass
Mole of Cu = 215/63.55
Mole of Cu = 3.38 moles
Therefore, 3.38 moles of copper (Cu) is present in the sample.
Which substances from the simulation are more alkaline than water?
Which
Answer:
The substances more alkaline than water are;
1) Spit, 2) Blood, 3) Hand Soap, and 4) Drain Cleaner
Explanation:
The diagram in the simulation displays a list of liquid substances, arranged from bottom to top in the order of increasing alkalinity.
The ph of water is 7.0
The ph of spit (saliva) is between 6.2 and 7.6
The ph of blood is about 7.4
The ph of hand soap is between 9 and 10
The ph of drain cleaner is between 12 and 14.
which 2 statements describe a mixture?
1. It includes atoms of different elements.
2. Its parts can be separated using physical means.
3. It can result from chemical bonding.
4. It is a pure substance.
Answer:
It's parts can be separated using physical means.It is a pure substance.1. Define λmax and explain why it is desirable to do the experimental procedure at λmax? 2. Around what absorbance would you expect the λmax to be with each color solution? (Blue, green, red, yellow) 3. A pipet is used to make the solution dilutions in lab. Suppose in making the dilution, additional distilled water is accidentally added. Will the concentration of the solution be higher or lower that disered? Explain.
Answer:If you help me with the triple beam balance gizmo then i can do this for you
Explanation:please i need help
A block weighing 13.15 grams has sides of 11.5 cm, 5.75 cm, and 8.44 cm. What is the density of the block in g/cm?
0.519 g/cm3
0.0236 g/cm3
42.4 g/cm
1.95 g/cm
Answer:
B. or .0236
Explanation:
Multiply the 3 sides to get 558.095, then divide the mass and volume to get .0236
a student collected data about how different fertilizers affect a plant growth. which type of graph should they use to show the data? PLS HELP ASAP :C worth 100 points lol
Answer:
I think they should use a bar graph
Explanation:
Because if they use a bar graph they could mark each of the different kind of fertilizer and they could easily see which one affected it the most, either good or bad, by the looking at the heights of the bars to determine your conclusion.
Hi there!
:bar graph:
If they use a bar graph they could mark each of the different kind of fertilizer and they could see easier to tell which one affected it the most, by looking at the heights of the bars to determine the answers.
A boy found a solid metal box in his backyard. The box had been buried for so long, it was difficult to determine from what the box was made. The boy measured the box and found its volume (v) to be 17.63 cubic centimeters (cm3) and its mass (m) to be 158 grams (g). The boy knows the formula for density (D) is D = m/v. This table shows the density of several metals. DENSITY OF METALS *
A. copper
B. gold
C. silver
D. tin
Answer:
Box is made up of copper, because density is 8.96 g/cm³.
Explanation:
Given data:
Volume of box = 17.63 cm³
Mass of box = 158 g
Which metal box is this = ?
Solution:
First we will calculate the density of box then we will compare it with the density value of given metals.
d = m/v
d = 158 g/ 17.63 cm³
d = 8.96 g/cm³
The calculated density is similar to the given density value of copper thus box is made up of copper.
whats the volume of a 2 year old
Answer:
here's a great idea!
take a jug of water by finding the volume of that water and ask the 2 year old to chug it all in... the volume of water drank by the 2 year old is the volume of the two year old
6. In our modern times, the atom can be subdivided into
A.) protons and electrons, only
B.) protons and neutrons, only
C.) protons, neutrons, and electrons, only
D.) neutrons and electrons, only
Answer:
C.) protons, neutrons, and electrons, only
Explanation:
According to the modern atomic theory, we can distinguish 2 parts in an atom:
The nucleus, where is the majority of the mass of the atom, that is, protons and neutronsThe external shell, where are the electrons.In a neutral atom, there are the same number of protons (positive charges) as electrons (negative charges).
Chelsea adds a 65% acid solution to 25 milliliters of a solution that is 30% acid. How much of the 65%
acid solution should be added to create a solution that is 40% acid?
Answer:
10 ml
Explanation:
The concentration of the acid solution Chelsea adds to the 25 milliliters of 30% acid solution = 65%
The concentration of the acid solution Chelsea requires = 40%
The volume, X, of the 65% acid solution required is given as follows;
65% × X + 30% × 25 = 40% × (25 + X)
As fractions, we have;
0.65 × X + 0.3 × 25 = 0.4 × (25 + X)
0.65·X + 7.5 = 10 + 0.4·X
0.65·X - 0.4·X = 10 - 7.5
0.25·X = 2.5
X = 2.5/0.25 = 10
X = 10 ml
The volume of the 65% acid that should be added to create a solution that is 40% acid = 10 ml.
Formula for all possible isomers of hexane
Answer:
1) n-Hexane. 2) 2-Methyl pentane(IUPAC name) or Isohexane(common name). 3) 2,2-Dimethylbutane(IUPAC name) or Neohexane(common name). 4) 3-Methylpentane
Explanation:
state two advantages of parallel over series connection in table form?
Advantages of parallel combination over series combination are:
1) In parallel combination each appliance gets the full voltage.
2) If one appliance is switched on/of others are not affected.
3) The parallel circuit divide the current through the appliances. Each appliance gets proper current depending on its resistance.
4) In a parallel combination it is very easy to connect or disconnect a new appliance without affecting the working of other appliances.
choose what you like!
Note that there are also some disadvantages to using parallel connections over series connections, such as increased complexity in wiring and the need for additional safety measures when working with high voltage circuits. The choice between series and parallel connections depends on the specific requirements of the circuit and the devices being used.
Help fast I have a few left
Answer: A
Explanation: 0.00624 x 10^8
All you have to do is move the . 8 units left
This gives you 624000.0
A chemist must prepare of aqueous copper(II) sulfate working solution. He'll do this by pouring out some aqueous copper(II) sulfate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in of the copper(II) sulfate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
Answer:
380 mL
Explanation:
A chemist must prepare 925 mL of 325 mM aqueous copper(II) sulfate working solution. He'll do this by pouring out some 0.792 M aqueous copper(II) sulfate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the copper(II) sulfate stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits.
Step 1: Given data
Initial concentration (C₁): 0.792 MInitial volume (V₁): ?Final concentration (C₂): 325 mMFinal volume (V₂): 925 mLStep 2: Convert "C₂" to M
We will use the conversion factor 1 M = 1000 mM.
325 mM × (1 M/1000 mM) = 0.325 M
Step 3: Calculate the inital volume
We will use the dilution rule.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂/C₁
V₁ = 0.325 M × 925 mL/0.792 M
V₁ = 380 mL
True or false igneous rocks can only turn into metamorphic
Answer:
this is false igneous rocks can turn into either sedimentary rocks and they can be metamorphic
Explanation:
i hope this helps your welcome :)
Answer:
False
Explanation:
Igneous rocks can turn into sedimentary rocks as well as metamorphic.
place the items in order from highest to lowest degree of internal organization.
tissue
organ system
organ
cell
Put them in order please PLEASE
Answer:
I hope this helps! Can I have Brainliest plz :)
Explanation:
Which iron pot has the least thermal energy?
A. A5 kg pot at 130°C
B. A 2 kg pot at 120°C
C. A 5kg pot at 25°C
D. A 2 kg pot at 25°C
Answer: D. A 2 kg pot at 25C.
Explanation:
Name at least 3 elements used for photographs and cameras .
hope this help!
What is the process called when the moon bagins to fade from full moon to new moon
The rows in the periodic table are called periods.
What is true about elements in the same period?
Answer:
elements in the same period have the same number of shells
the period number the element is in, that is the number of shells it has.
what are two things that affect gravity?
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
Explanation:
If a 20-N net force makes an object accelerate at 10 m/s^2, what is the mass of the object?
Answer:
The answer is 2 kgExplanation:
The mass of the object can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
where
a is the acceleration
f is the force
From the question we have
[tex]m = \frac{20}{10} \\ [/tex]
We have the final answer as
2 kgHope this helps you
3. The presence of the same
a. fossils
b. rocks
on several continents supports the hypothesis of continental drift.
c. neither a norb
d. both a and b
Answer:
with someone or in the same place as them
Explanation:
i need help ASAP ! Please
Answer:
Your friend gave the better response
Explanation:
Formula for density:
Density = mass/volume
p = m/v
Let's substitute the given values into the equation:
p = m/v
p = 23.2/8.593
Solve:
p = 23.2/8.593
p = 2.69987198883
2.69987198883 grams per volume
Notice that 2.69987198883 is the exact answer. Your answer is 2.67, which is inaccurate, even if rounded. If you were to round the exact answer to the nearest hundredth, it would be 2.70 which is not 2.67.
Therefore, your friend gave the better response because it is the correct answer.
density equals mass over volume
23.2/8.593 = 2.69 g/mL
in one to 2 sentences explain how a stimulus to one type of receptor might be percieved as a simulus to another type of receptor in people who have synesthesia???
HELP
Synesthetes — or people who have synesthesia — may see sounds, taste words or feel a sensation on their skin when they smell certain scents.
I don't know if this helps at all, but i hope it does.
hello~i will really appreciate it if you answer all this♡
☆
1.How many valence electrons do noble gases like Ne,Ar and Kr have?
a.1.
b.2
c.6
d.7
2.The following describe ionic bonding,EXCEPT____.
a.It involves the transfer of electrons.
b.It involves sharing of electrons.
c.atoms either gain or lose electrons.
d.It is a bond between a metal and a non-metal.
3.Which of the following pairs of atoms is most likely to form a covalent compound?
a.C,O
b.Na,O
c.Mg,Br
d.Ba,CI
4.Which of the following is a metal?
a.O
b.S
c.K
d.C
5.Which is not a type of a chemical bonding?
a. Polar bonding
b.Metallic bonding
c.ionic bonding
d.covalent
||. A. Use Lewis structures to show . the transfer of electrons in the given combinations.
1.K +Br
2.Ba + I
3.Be + O
4.Na + S
5.AI + F
B.What ionic charge will the following elements have?PLEASE JUSTIFY YOUR ANSWER.
1. Group 2A
2. Group 5A
3.Group 6A
C.Predict whether the bonding in the oxides of the following elements is covalent or ionic.EXPLAIN YOUR ANSWER.
1.Aluminum
2.Magnesium
3.Phosphorus
4.silicon
5.sodium
|||. Write the electron configuration of the following elements.
1. Ti
2. V
3. Se
4. Ag
5. Zr
thank you!
to your hardwork★
Explanation:
1)Noble gases have stable valence electron of 2 and 8.
2)B- ionic compounds do not require sharing of electron.
3)B- sodium and oxygen will likely form a covalent compound.
4) C- potassium
5) A- polar bonding
6)
can you guys help me please? I dont get what im supposed to do here.
- include the process that causes the sun to release so much energy
-The equation for the process that causes the energy. -show what is happening to all the energy coming from the sun.
-how does it affect earth and life on earth
Answer: nuclear fusion, equation:(Z + N) in a nucleus of mass M. The formula is B = (Zmp + Nmn − M)c2, All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.
Explanation: i explained everything in the answer hope this helped
define empirical formula and molecular formula with example of each