Answer:
Kelvin, Celsius, Fahrenheit
Explanation:
See my other answer for an explanation.
Joules, Kelvin and Calories
Write 0.0000745 in scientific notation.
Answer:
the answer is 7.45 x 10^-5
Move the decimal point 5 places to the right.
which 2 elements form ionic chlorides and why?
Answer:
sodium magnesium
Explanation:
by ganning one electron
A trapezoid has an area of 20 cm2 and a height z cm. The lengths of the parallel sides are (2z + 3) cm and (6z – 1) cm. Find the height, z, of the trapezoid. In your final answer, include all of the formulas and calculations necessary
Answer:
Height z= 2.115 cm
Explanation:
The formula for area of a trapezoid is ;
A=1/2(a+b)h where A is area, a and b are the lengths of parallel sides and h is the height of the trapezoid.
Given in the question;
A= 20 cm²
a=( 2z + 3 ) cm
b= (6z-1) cm
h= z =? unknown
Substitute in the formula as;
A=1/2(a+b)h
20=1/2(2z+3+6z-1)z -----------multiply both sides of the equation by 2
40= (2z+3+6z-1)z -----------collect like terms as
40 =(2z+6z+3-1)z
40=(8z+2)z -----open brackets as
40=8z²+2z --------- form a quadratic equation
8z²+2z-40 = 0 -----solve the quadratic equation to find value of z
z²+0.25z-5=0
z= 2.115
HI PLEASE HALP MEH
Habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting an entire ____.
A: Organism
B; population
C: ecosystem
D: species
Habitat preservation is usually the most efficient method of protecting biodiversity because it involves protecting an entire ecosystem.
What are natural habitats?The natural world provides a variety of resources that can be taken advantage of for financial gain, such as timber taken from forests and clean water taken from streams and hence the entire ecosystems preservation.
However, anthropogenic economic growth-related land expansion frequently results in a decrease in the ecological integrity of neighboring natural habitat.
A management strategy known as habitat conservation aims to preserve, maintain, and restore habitats in order to stop the extinction, fragmentation, or range reduction of species. It is a focus of numerous groups that is difficult to categorize in terms of a single ideology.
For instance in tropical regions with a high species richness or in leisure activities like hiking and mountain biking that take place in undeveloped areas. Repairing harmed ecosystems is thought to be substantially more valued.
To find more on ecosystems, refer here:
https://brainly.com/question/13979184
#SPJ6
Classify the following observation as a extensive physical property, intensive physical property, or achemical property. Zinc dust is flammable.________________________ Benzene freezes at 278.7K.____________________ The wooden block weighs 15 grams._____________ copper sulfate crystals are blue
Answer: Chemical, Chemical, Physical
Explanation:
What should go in the blank?
^38 19K —> _____ + ^0 -1β
A: ^38 18Ar
B: ^38 20Ca
C: ^39 20Ca
D: ^39 19K
Answer:
³⁸₂₀Ca.
Explanation:
³⁸₁₉K –> __ + ⁰₋₁β
Let ʸₓA represent the unknown.
Thus the equation above can be written as:
³⁸₁₉K –> ʸₓA + ⁰₋₁β
Thus, we can obtain the value of y an x as follow:
38 = y + 0
y = 38
19 = x + (–1)
19 = x – 1
Collect like terms
19 + 1 = x
x = 20
Thus,
ʸₓA => ³⁸₂₀A => ³⁸₂₀Ca
Therefore, the equation is:
³⁸₁₉K –> ³⁸₂₀Ca + ⁰₋₁β
Which compound forms a powerful acid and also contains a halogen?
A. H2S
B.HBr
C.Li2O
D.LiBr
Answer:
HBr
Explanation:
Answer:
The answer is in fact HBr
Explanation:
I took the quiz
:)
Peptides can be separated using an ion‑exchange column based on their isoelectric (pI) values. At which pH values would two different peptides, one with a pI of 5.55.5 and the other with a pI of 9.29.2 , bind to a cation‑ and anion‑exchange column? Each peptide may be capable of binding to each column at more than one pH value.
Answer:
At pH of 3.6, Peptide A and B will bind to the anion-exchange column, while neither peptide will bind to the cation-exchange column.
At pH of 6.6, Peptide A will bind to the cation-exchange column while Peptide B will bind to the anion-exchange column.
At pH of 10.0, Peptide A and B will bind to the cation-exchange column, whereas neither peptide will bind to the anion-exchange column.
Note: The question is incomplete. A sample complete question is found in the attachment below.
Explanation:
If pH is greater than pI, the net charge on the peptide is negative.
When pH = pI, the net charge is zero
When pH is less than pI, the net charge on the peptide is positive.
A positively charged peptide will bind to an anion-exchange column, whereas a negatively charged peptide will bind to a cation-exchange column.
At pH of 3.6, Peptide A and B will bind to the anion-exchange column, while neither peptide will bind to the cation-exchange column.
At pH of 6.6, Peptide A will bind to the cation-exchange column while Peptide B will bind to the anion-exchange column.
At pH of 10.0, Peptide A and B will bind to the cation-exchange column, whereas neither peptide will bind to the anion-exchange column.
What charge does the following elements form?
7 km is equal to:
700 m
0.7 m
7,000 m
70 m
7000m is the answer as 1 km is 1000m ...so 7km multiplied by 1000m u get 7000 m...and always remember if u r converting a bigger unit to a smaller unit u multiply and if u r converting a smaller unit to a bigger unit u divide
Answer:7,000m
Explanation:
Which sentence best explains the observed trend in atomic radius as you
move down the periodic table?
O A. The more core electrons an atom has, the smaller the atomic
radius.
OB. The more energy levels that are occupied by electrons, the larger
the atomic radius.
C. The more paired electrons there are, the smaller the atomic radius.
O D. The more neutrons a nucleus has, the larger the atomic radius.
Answer:
B
Explanation:
The more energy levels that are occupied by electrons, the larger
the atomic radius.
The more energy levels that are occupied by electrons, the larger
the atomic radius. Hence, option B is correct.
What is the atomic radius?The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together.
In general, the atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remain constant.
Hence, the observed trend in atomic radius as you move down is that the more energy levels that are occupied by electrons, the larger
the atomic radius.
Learn more about the atomic radius here:
https://brainly.com/question/13607061
#SPJ2
Gases can be defined by the following statement:
Gases freely flow to fill the container they are in.
Gases have neither a defined volume nor shape.
Gases are highly compressible.
All of the above
Gases can be defined by the statement, gases freely flow to fill the container they are in, gases have neither a defined volume nor shape and gases are highly compressible.
What is gas?Even in the existence of gravity as well as irrespective of the mass of a substance in the vessel, gas is just a sample of matter which make up the structure of the container where it is contained and achieves an uniform distribution within the container.
What is volume?The term "mass" refers to the amount of material used to construct anything. The volume of a thing refers to the amount of space it occupies.
Gases can be defined by the statement, gases freely flow to fill the container they are in, gases have neither a defined volume nor shape and gases are highly compressible.
Therefore, the correct answer will be option (D).
To know more about gas and volume.
https://brainly.com/question/3637358
#SPJ2
The volume of a gas sample is 22.4 liters at STP. The density of the gas is 1.34 grams per liter.
What is the mass
of the gas sample, expressed to the correct number of significant figures?
Answer:
The mass of gas is 30.02 g.
Explanation:
Given data:
Volume of gas = 22.4 L
Density of gas = 1.34 g/L
Mass of gas = ?
Solution:
The given problem will be solved through density formula.
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
Now we will put the values in formula.
1.34 g/L = m /22.4 L
m = 1.34 g/L × 22.4 L
m = 30.02 g
The mass of gas is 30.02 g.
Ms. Clark added a spoonful of baking soda and then poured a little vinegar into the cup. We observed fizzing and bubbling. Based on what we saw or observed, we decided that a new substance was formed by mixing the baking soda and vinegar. How do we know that? O A gas formed. o It was magnetic. It was a conductor. o It was hot. 0 It changed colors to pink.
Answer:
we know that it was the vinegar and baking soda because gas had been created, the gas was held within the bubbles. the gas that was created was called Carbon Dioxide or CO2
Which phrase best defines speed?
Select one:
The force on an object divided by the object's mass.
O
The distance traveled by an object in a certain time.
The mass of an object multiplied by its acceleration.
о
The distance traveled by an object at a certain velocity.
Answer:
D
Explanation:
I took this class
PLEASE ASAP
A calcium atom has 20 protons, 18 electrons, and 20 neutrons. What is the charge on the atom?
Answer:
Ca2+ represents an ion with 20 protons and 18 electrons.
Explanation:
A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.
The highest mountain in North America is Mt. McKinley at 3.848 miles high. How many kilometers is that?
Who do you think should be responsible for cleaning up all the space junk orbiting the earth?
Please I really really needed help
Answer:
astronots there already up there so they might as well do it.
Can someone answer this truly or get report not to be mean just want a right answer but listen to this tell me if this is crazy i so like i notice that same day that i got on here is the same day my girlfriend started brainly the same day i did is that a coincident or not like that is crazy my words may have been right it just happens when you least expect it like the soulmate things .
Answer:
It's most likely a coincidence.
what happens to the atoms of the reactants during a chemical reaction?
In any measurement, which digit is the uncertain digit?
Answer:
The last digit is estimated
Explanation:
the last digit of any measurement is estimated, and it is this estimated digit that reflects uncertainty. The more decimal places there are the less uncertainty there is.
The number of significant figures is uncertain in a number that ends with a zero to the left of the decimal point location. The zeros in the measurement 1,300 grams could be significant or they could simply indicate where the decimal point is located.
According to the concept of significant figures, the last digit is uncertain digit in a measurement.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
Learn more about significant figures,here:
https://brainly.com/question/29153641
#SPJ2
What is the density of a sample of a substance with a volume of 120ml
and a mass of 90g?
Answer:
The answer is 0.75 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 90 g
volume = 120 mL
We have
[tex]density = \frac{90}{120} = \frac{9}{12} = \frac{3}{4} \\ [/tex]
We have the final answer as
0.75 g/mLHope this helps you
Which phase change is best described by the following expression:
molecules moving very fast and far apart suddenly find themselves close
together but yet able to still move past each other? *
Answer:
Explanation:
Do you go to gami
The smallest unit of a compound in which two or more atoms are joined chemically together
Molecule.
A. Energy
B. Organism
C. Chemical reaction
D. Matter
E. Cellular respiration
Write an essay (10 lines) about "What is Energy?" How many types of Energy do you know? and which are the types of Energy most used in the world?
How is thermal energy from the equator distributed along the coastlines?
The thermal energy from the equator is distributed along the coastlines with the help of : Convectional currents ( aka convection )
The water bodies located along the equator gets heated up quicker than the water bodies located along the coastlines. Therefore to maintain the overall temperature of the Biosphere the heated water bodies transfers its thermal energy towards the colder coastlines through convection with the help of convectional currents.
Convection is the transfer of heat from a warm substance ( usually liquid ) to a colder substance due to movement of liquids, from a region of higher temperature to a region with lower temperature.
Hence we can conclude that thermal energy from the equator is distributed along the coastlines through convectional currents.
Learn more : https://brainly.com/question/9382711
I REALLY NEED HELP!!
Use dimensional analysis to make the following conversion:
2560 cm = _________m
Answer:
2560 cm = 25.6m
Explanation:
Determine the number of moles present in 25.0 grams of NaCl.
Answer:
0.42 mol
Explanation:
25 g / Ar(Na) + Ar(Cl) = 25g/58.44 = 0.42mol
Would sodium bond with potassium (atomic number 19)? Why or why not?
Answer:
NoExplanation:
Sodium ;
Atomic number = 11
Group = Group 1
Valence electrons ; 1
Charge = electropositive elements
Potassium ;
Atomic number ; 19
Group = Group 1
Valence electrons ; 1
Charge = electropositive elements
Reason why Sodium and Potassium can not form a bond ;
They both belong to the same group in the periodic table (Group I).They both contain one electron in their outermost shell(they need to lose it)So, a chemical reaction between both these elements is not going to establish octant sate for either of the element.
Help please
C2H4O2
1. How many different atoms are in the compound above?________
2. How many atoms of hydrogen?__________
3. How many total atoms are in this compound?________
4. If a big 2 were added in front of the formula, what would that mean?
Answer:
1. There are three different atoms
2. There are 4 hydrogen
3. There are 8 atoms in the compound
4. All the atoms are double the number
