Answer:
atomic number
Explanation:
Answer:
number of electrons and number of neutrons
which element has an atom with the following composition? 24 protons, 28 neutrons and 24 electrons.
If a boulder sits at rest on top of a mountain what conclusion can be made about the forces acting on the
A boulder sits at rest on top of a mountain. What conclusion can be made about the forces acting on the boulder? The forces acting on the boulder are balanced (net force equals zero).
If a boulder sits at rest on the top of the mountain , the forces acting on the boulder are zero as it is in the state of rest.
What is a force?
Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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19. Chemical properties can be used to
(1) differentiate between two compounds
(2) determine the temperature of a substance
(3) determine the density of a substance
(4) differentiate between two neutrons
Answer:differentiate between two compounds i think!
Explanation: taking a test!
Answer:(1) differentiate between two compounds
Explanation:
A Chemical property tells us the characteristics of a particular matter or substance after a chemical change. This property helps us to differentiate a compound from another or differentiate elements or substances. Examples of a Chemical property are acidity, reactivity and heat, etc .
For example to differentiate between Water H2O and Hydrogen peroxide, H202
Even though they are made up of oxygen and hydrogen. Hydrogen peroxide (H2O2), has more(1) oxygen than water (H2O).
Using Acidity as a chemical property to differentiate these substances
Water, H20 is amphoteric in nature ie having both acidic and basic properties, while H202 is a weak acid.
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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 :)
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)
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).
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
Can anyone explain to me how I solve 3x10^8 / 3.82x10^-7
I know the answer due to referring to the key but I'm not sure how they got it. Answer was 7.85x10^14
Answer:
You have to do this on a calculator. So when you put it in the calculator you will get 7.85x10^14.
3x10^8 is the speed of light. 3.82x10^-7 is the number in the question.
You can solve it like this
3x10^8
------------------
3.82x10^7
But you would do this on a calculator.
Examples of physical change include?
A. Melting
B. Boiling
C. Freezing
D. All of these are examples of physical change
Answer:
All of these examples are physical changes.
Explanation:
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition.
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.
How many molecules are in 1.35 mol of CS2
Answer:
There are there are 8.13-10^25
Explanation:
N(CS2)= 1.35* (times) 6.02-10^ 25= 3.13-10^25 molecules
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles of CS[tex]_2[/tex] = 1.35 mol
Substituting all the given values in the above equation, we get
number of atoms/molecules= 1.35 × 6.022×10²³
number of atoms/molecules=8.12×10²³ molecules
Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
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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:
what is chemistry about
Answer:
Explanation:
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything.
Answer:
its the science that deals with the properties, composition, and structure of substances like elements and compounds, the transformations they undergo, and the energy that is released or absorbed during these processes
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:
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.
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.
Which statement best describes how entrepreneurship affects a society's
economy?
A. It encourages people to take risks to create new products.
B. It organizes the people who help a business operate.
C. It provides the raw materials needed to produce goods.
D. It supplies businesses with the tools they need to function.
Answer:it’s a
Explanation:cause
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 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.
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
Which of the following is not a gas in the Earth's atmosphere? A. oxygen B. carbon dioxide C. sulfur D.nitrogen 1
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.
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.
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
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.a screwdriver has a volume of 0.418 cubic centimeters. it also has the mass of 2.3 grams. what is the screwdrivers density
Answer:
The answer is 5.50 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{2.3}{0.418} \\ = 5.50239234...[/tex]
We have the final answer as
5.50 g/cm³Hope this helps you
Answer:
Comets are cosmic snowballs of frozen gases, rock and dust that orbit the Sun. When frozen, they are the size of a small town. When a comet's orbit brings it close to the Sun.
Explanation:
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.
please anyone help me with this
Answer:
matter is anything that takes up space while elements are subtanxes that can be broken down
What do you think is the difference between an "open" system & a "closed" system?
Answer:
Hope it help you
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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.
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