Answer:
Periods are horizontal rows while the groups are the vertical columns on the periodic table.
Convert 78.9 kJ into calories (can you also explain how pls, ty <3)
Answer:
1 Joule=0.2390057361 Calorie
789kj=789×0.2390057361×1000
=188575.5257829calorie
Explanation:
Hope u have understand
Dalton’s theory states that atoms are the smallest possible parts of elements. In a chemical reaction, atoms will rearrange and form new substances with new properties. change form into completely new atoms with new properties. be destroyed and remade into new substances. be turned completely into energy.
Answer: A rearrange and form new substances with new properties.
Explanation: Got it right on Edgenuity
Answer:
a
Explanation:
got it right
A student needs exactly 1 gram of baking powder to conduct an experiment. The balance reads 0.37 grams. How
much more baking powder does the student need?
A. 50 grams
B. 63 grams
C. 75 grams
D. 36 grams
Answer:
B
Explanation:
If the student needs one gram but so far only has 0.37 grams, then the amount they need is the difference between what they need and how much they already have. 1-0.37=0.63 grams.
...which isn't actually an option because none of them have decimal points but I would say it is B anyway because it is the equivalent ratio and maybe there was a typo.
Hope this helped!
Answer:
The answer is B :)
Explanation:
How many significant figures are in $10,000,210
7
3
Answer:
7
Explanation:
Answer:
7
Explanation:
The significant figures are: 1,0,0,0,0,2,1
Remember the rules is
1. Non-digits are always significant.
2. Any zeros between two significant digits are significant.
3. A final zero or trailing zeros in the decimal portion only are significant
Those are three rules you have to follow in order to see how many significant figures there are in 10,000,210.
So I’m guessing 7 is the answer
Therefore the answer is 7.
Hope this helps! :)
Brainliest would be highly appreciated! Thanks! :)
1. Isotopes of are atoms of the same element that vary in
A. protons
B. neutrons
C. protons and neutrons
D. neutrons and mass
2. What do these 2 atoms have in common? B-10 and B-11?
A. both have same number of neutrons
B. both have 5 electrons
C. both have 6 protons
D. both have same mass
Explain how you got your answer
Answer:
1. D
2. B
Explanation:
1. Isotopes vary in neutrons. Due to this variance, the difference in neutrons change the mass of the element.
Note: the amount of protons in an element never changes. The number of protons (the atomic number on the periodic table) identifies the element in question. If you add or subtract protons, you change the element.
2. B-10 and B-11 are two isotopes of the element Boron: One with 10 neutrons, and another with 11 neutrons. Because they contain a variance of neutrons, they do not have the same mass. This cancels choices A and D.
The protons of an element are equal to the atomic number of that element. Borons atomic number is 5 (according to the periodic table), so it contains 5 protons. This cancels choice C as the element with 6 protons is Carbon.
Note: The amount of protons in an atom is balanced out by the same amount of electrons to allow for a neutral charge of the element (i.e., the protons, which contain a positive charge, and electrons, which contain a negative charge, cancel each other out. In the case of Boron: +5 protons - 5 electrons = 0 charge). This is why choice B is correct, as the consideration of an ion is not necessary for this question.
Suppose now that you wanted to determine the density of a small crystal to confirm that it is phosphorus. From the literature, you know that phosphorus has a density of 1.82 . How would you prepare 20.0 mL of the liquid mixture having that density from pure samples of ( = 1.492 g/mL) and ( = 2.890 g/mL)? (Note: 1 mL = 1 .)
Answer:
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
Explanation:
Given that:
the density of the mixture = 1.82 g/mL
From the density of the pure samples
The density of [tex]CHCl_3[/tex] = 1.492 g/mL
The density of [tex]CHBr_3[/tex] = 2.890 g/mL
The total volume of the liquid mixture = 20.0 mL
Suppose the volume of [tex]CHCl_3[/tex] = P ml
and the volume of [tex]CHBr_3[/tex] = Q ml
the sum of their volumes should be equal to the total volume of the mixture
[tex]P \ ml + Q \ ml = 20 ml[/tex] ----- (1)
However, we know that Density = mass/volume
∴ mass = density × volume
The equation can now be expressed as:
[tex]\mathtt{(Density \ of \ CHCl_3 \times Vol. \ of \ CHCl_3 ) + (Density \ of \ CHBr_3 \times \ volume \ of \ CHBr_3)} = \mathtt{ (Density \ of \ mixture \times volume \ of \ the \ mixture)}[/tex]
1.492 g/mL × P mL + 2.890 g/mL × Q mL = 1.82 g/mL × 20 mL ---- (2)
From equation (1) ;
let Q = 20 - P
The replace the value of P into equation (2)
1.492 g/mL × P mL + 2.890g/mL × (20 - P) mL = 1.82 g/mL × 20 mL
1.492 P g + 57.8g - 2.890 P g = 36.4g
1.492 P g - 2.890 P g = 36.4g - 57.8g
-1.398 P g = -21.4g
P = -21.4g/-1.398g
P = 15.31 mL
Q = 20 - P
Q = (20 - 15.31) mL
Q = 4.69 mL
∴
Volume of [tex]CHCl_3[/tex] = 15.31 mL
Volume of [tex]CHBr_3[/tex] = 4.69 mL
What is scientific notation
scientific notation is a mathematical way to turn large of small numbers into a simpler form.
ex. 9000000000 is 9*10^9 in scientific notation
ex. 0.000000009 is 9*10^-9 in scientific notation
A sample has a volume of 10 ml and a mass of 4.2 g what density of the object
Answer:
0.42g/cm³ or 420kg/m³
Explanation:
1cm³ = 1ml
10 × 1cm³ = 10cm³
Density = Mass ÷ Volume
4.2g ÷ 10cm = 0.42 g/cm³
Density = 0.42g/cm³ or 420kg/m³
How are the Celsius, Kelvin, and Fahrenheit scales similar? How are they different? Considering their differences, think of one scenario in which each scale is more convenient to use.
Answer:
The Celsius scale is in general use wherever metric units have become accepted, and it is used in scientific work everywhere. Kelvin temperature scale is the base unit of thermodynamic temperature measurement in the International System (SI) of measurement
Can skmebodynheop me with this it’s science.
Answer:
v=50km/hr
Explanation:
Given:
s= 300km
t= 6 hours
Required:
v=?
Formula:
v=s/t
Solution:
v=s/t
v=300km/6h
v=50km/hr
Hope this helps ;) ❤❤❤
What is the volume of the table tennis ball?
cm3
The volume of the water in the graduated cylinder rose
as some of the water was displaced by the table tennis
ball. Find the volume of the ball using the formula
Vb = Vf-Vi
where Vb is the volume of the ball, Vf is the final volume
of the water, and Vi is the initial volume of the water.
Record the volume of the ball in Table A of your Student
Guide.
The volume of the ball is the same as the volume of fluid that it displaces.
Even though the question is incomplete but i will try to help you the much i can. We have to recall that the volume occupied by the tennis ball is equal to the volume of the water displaced and this offers a convenient way of measuring the volume of solids.
The volume of the tennis ball is obtained by accurately measuring he volume of the water before putting in the tennis ball. The volume of the ball is the same as the volume of fluid that it displaces which is Vb = Vf-Vi
Learn more about displacement method: https://brainly.com/question/16610815
Answer:
40cm^3
Explanation:
I did this assignment and this was the answer so
A covalent bond is likely to be polar when ________. one of the atoms sharing electrons is more electronegative than the other atom carbon is one of the two atoms sharing electrons the two atoms sharing electrons are equally electronegative the two atoms sharing electrons are of the same elements 0
Answer:
one of the atoms sharing electrons is more electronegative than the other atom
Explanation:
A covalent bond is likely to be polar when one of the atoms sharing electrons is more electronegative than the other atom. Therefore, option (A) is correct.
What is a covalent bond?A covalent bond can be described as a chemical link formed by the exchange of electron sets between particles. A covalent bond can be formed by equal sharing of electrons from both contributing atoms.
The pair of electrons in this type of bonding is known as shared pair or bonding pair. Covalent bonds are the sharing of bonding pairs that will ensure that the atoms gain stability in their outer shell.
Elements with very high ionization energies are incapable of transferring electrons and elements having low electron affinity cannot accept electrons. Covalent bonding takes place between two non-metallic atoms characterized by the equal sharing of electron pairs between the atoms and other covalent bonds with an electronegativity difference is more than 2.0.
Therefore, the covalent bond can be polar if one atom is more electronegative than the other atom.
Learn more about covalent bond, here:
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What products are formed when a hydrocarbon combusts?
A. Hydrogen and oxygen
B. Carbon dioxide and water
C. Carbon dioxide and hydrogen
D. Water and hydrogen
Answer:
b
Explanation:
The products are formed when a hydrocarbon combusts are carbon dioxide and water and the correct option is option B.
Combustion is a chemical reaction that occurs when a fuel combines with an oxidizing agent, typically oxygen, resulting in the release of heat and the formation of products. It is an exothermic reaction, meaning it releases energy in the form of heat and light.
During combustion, the fuel undergoes rapid oxidation, breaking its chemical bonds and forming new bonds with oxygen. Common examples of combustion include burning of wood, gasoline, natural gas, and other hydrocarbon fuels.
The reaction is often accompanied by the production of flames and the release of carbon dioxide and water vapor.
Thus, the ideal selection is option B.
Learn more about Combustion, here:
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PLEASE HELP ME :( It’s urgent!!!!!
Answer:
C and D
Explanation:
In the first table, both element particles have more electrons than protons which is unusual and indicates they have a negative charge. Furthermore both numbers add up to full electron shells (2,8 and 2,8,8) meaning they are ions (charged particles formed to gain full valence shells and become stable), so it is C for the first question, negative ions.
As for the second one, isotopes like versions of the same element except with different numbers of neutrons, so they are still the same element but have different mass. As shown here the numbers indicate the number of neutrons therefore it is D, 3 more neutrons and no more electrons.
Hope this helped!
What is common to both physical
and chemical properties? List as
many similarities as you can.
Answer:
Chemical properties are very useful in identifying substances. However, unlike physical properties, chemical properties can only be observed as the substance is in the process of being changed into a different substance.
Explanation:
Uun element full name
Answer: Darmstadtium
Hope that helped
Answer:
Ununnilium
Explanation:
Uun on the table of elements is Ununnilium.
What problem did the development of the metric system solve?
Answer:
The problems solved by the metric system includes, the eradication of fraud prevalent by the use of the approximately 800 units that were defined in 250 thousand ways due to the difference of the associated quantity to the units in different towns
The development of the metric system also solved the issues scientist had with working with the medieval system which were mainly national and regional systems that hindered scientific communication across regions
Explanation:
How does the amount of matter change when water changes state? (2 points)
a
The amount of matter always increases as water changes state.
Ob
The amount of matter always decreases as water changes state.
Ос
The amount of matter stays the same as water changes state.
o
d
The amount of matter varies depending on how water changes state.
Answer:
C, because matter can not be created or destroyed.
Explanation:
Hey there!
I believe your answer woukd be "The amount of matter stays same as water changes state."
Hope this helps!
Have a great day!
what would be the best way to take water out of your coffee
3. How many protons do the following have?
Calcium
Gold
Copper
Iron
Answer:
calcium=20
gold=79
copper=29
iron=26
Explanation:
gottfried wilhelm von leibniz invented digital mechanical calculator called
Answer:
It was called The Step Reconer
stepped reckoner was invented by digital mechanical calculator
Identify from the following list which examples are controlled experiments. You make two pitchers of lemonade and only change the amount of lemonade mix you add. only change the amount of water you add. change both the amount of water and the amount of lemonade.
Answer:
It s A) only change the amount of lemonade mix you add, and B). only change the amount of water you add. I just did it
Answer:
It's the first two, only adding water and only adding lemonade mix, not both
Explanation:
Just got it right on Edge 2022
Look at the diagram below- what evidence is there that it
represents a chemical change?
Answer:
The second one resprents a chemical change because a chemical change is when a new substances is combined with the other substances to form a new substances
Explanation:
The diagram with the orange and grey in the middle plus the orange and white that is what the other substance created.
the statue of liberty in new york city is approximately 305 feet tall. How many US dimes would be in a stack of the same height? Each dime us 1.35 mm thick
Answer:
It takes 62863 dimes to equal the height of the Statue of Liberty.
Explanation:
If the Statue of Liberty is 305 ft tall and a coin is 1.35mm thick, how many coins will it take to equal the height of the statue?
Convert 305 ft to mm:
1 ft = 30.48 cm
305 ft = 9296.4 cm
92 964 mm
Now, if a dime is 1.35 mm thick, how many dimes will it take to get to 92 964 mm?
1 dime = 1.35mm
X dimes = 92964 mm
X coins = 92964 / 1.35
X = 62863 dimes
A 253 g block of wood has the following dimensions: Length 15.24 cm Width 6.64 cm Height 3.56 cm What is the density of the wooden block?
Answer:
0.7 g/cm³
Explanation:
hey there,
< The formula for density is [tex]p = \frac{m}{v}[/tex] where m = mass, v = volume, and p = density. An easy way to remember the formula is density equals love. I found this easy to remember because p = ♡ and when you think about it, if you split the heart in half through the middle like a fraction, it will make [tex]\frac{m}{v}[/tex] (if you don't understand what I'm saying, try writing it out and you will be able to see what I'm talking about!)
We already know that the block is 253 g so the mass is 253 g.
To find the volume, always multiply the 3 values width, length, and height whenever you are trying to find the volume of a block.
15.24 cm x 6.64 cm x 3.56 cm = 360.25 cm³
Now plug it into the formula.[tex]p = \frac{m}{v}=\frac{253}{360.25} = 0.7 g/cm[/tex]³ >
Hope this helped! Feel free to ask anything else.
Density of a substance is its mass divided by volume. Volume of the cube is calculated to 360.24 cm³ and thus the density of the cube is 0.7023 g/cm³.
What is density?Density of a substance is the measure of its mass per volume. Thus mathematically it is the ratio of mass to the volume of th substance. Density of a substance depends on the bond type, mass, volume, temperature and pressure.
The ratio of density of a substance to the density of water is called specific gravity. If the specific gravity is greater than one the body will sink in water and if it is less than one it will float on water.
The mass of the block is given 253 g and the volume can be calculated from the product of length,breadth and height.
Volume = 15.24 cm × 6.64 cm × 3.56 cm
= 360.24 cm³.
Density = mass/volume
= 253 g/ 360.24 cm³
= 0.7023 g/cm³
Hence, the density of the block is 0.7023 g/cm³.
To find more about density, refer the link below:
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A standard gold bar has a mass of 12.4 kg. When the gold bar is placed into a container of water the volume changes by 642 mL. What is the density of gold in g/mL
Answer:
19.3 g/mL
Explanation:
The following data were obtained from the question:
Mass (m) = 12.4 kg
Volume (V) = 642 mL.
Density (D) =.?
Next, we shall convert 12.4 kg to grams. This can be obtained as follow:
1 kg = 1000 g
Therefore,
12.4 kg = 12.4 × 1000
12.4 kg = 12400 g
Therefore, 12.4 kg is equivalent to 12400 g.
Finally, we shall determine the density of the gold as follow:
Density is simply defined as the mass of the substance per unit volume of the substance. It can be represented mathematically as:
Density (D) = mass (m) / volume (V)
D = m/V
With the above formula, the density of gold can easily be obtained as follow:
Mass (m) = 12400 g
Volume (V) = 642 mL.
Density (D) =.?
D = m/V
D = 12400/642
D = 19.3 g/mL
Therefore, the density of hold is 19.3 g/mL
what are electrode potential
Answer:
Electrode potential is the electromotive force to the galvanic cell built standard.
Explanation:
Electrode potential is the convention electrode is the standard hydrogen electrode to the value zero potential.
Electrode potential is the origin to the developed in that interface between the electrode and electrolyte.Electrode potential is the interface due to the transfer of across the specific of molecules to the electrode potential.Electrode potential that working potential non zero reaction net current the working electrode potential.Electrode potential is that performed extrapolation of that measured to that values set that standard.Electrode potential under the depends on the nature of that contacting electrode reactions to the interface.Electrode with hydrogen is that ideal solution is zero potential to the all temperature to standard formation.Electrode potential to the working electrode, counter electrode and reference electrode that using three setup electrode.Electrode potential are performed the positive of that connected to that working electrode terminal to reference electrode.Answer:
In electrochemistry, electrode potential is the electromotive force of a galvanic cell built from a standard reference electrode and another electrode to be characterized.
The density of helium is 0.17 g/L. What Is the mass of helium in a 5.4 L helium balloon? (2 sig figs) *
Answer:
The correct answer is 0.92 g
Explanation:
The density is defined as the mass per unit of volume:
Density= mass/volume
From the data provided:
volume= 5.4 L
density= 0.17 g/L
Thus, to calculate the mass of helium:
mass= density x volume = 0.17 g/L x 5.4 L= 0.918 g ≅ 0.92 g
What happens to particles when they are heated ?
Answer:
the molecules and atoms vibrate faster.
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determine the state of matter of the substance. The result of increased molecular motion is that the object expands and takes up more space.
➡ this answer is based on my research. I hope it can help you
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hydrogen ions cannot exist alone but they exist after combining with water molecules true or false