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.
name two units for density? I need help!!!!
Answer:
Density is commonly expressed in units of grams per cubic centimetre. For example, the density of water is 1 gram per cubic centimetre, and Earth ’s density is 5.51 grams per cubic centimetre. Density can also be expressed as kilograms per cubic metre (in MKS or SI units). For example, the density of air is 1.2 kilograms per cubic metre.
Explanation:
A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.
Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance
Answer:
C, Mixture
Explanation:
Answer:
the correct answer is actually D pure substance
Explanation:
if there is a sample 50 grams of naoh how many grams are na
Answer:
Which number is IRRATIONAL? A) √12 B) √36 C) √64 D) √144
Explanation:
Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K
16) 100- 273= -173°celsius
17) -73°Celsius
18) °Celsius
19) 77°Celsius
PLZZ HELP!!
An atom has atomic number 11 and mass number 23. How many electrons does the atom have?
23
22
O 12
O 11
Answer:
12
Explanation:
23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.
Which is a base unit used in the metric system?
Answer:
Quarts Litres Pints Degrees Fahrenheit.ASK for more
Answer:
d
Explanation:
_____ means to make the body well again
Answers;
A. Body Repair
B. Energy
C. Growth
D. Motion. (Which One is it??)
Answer:
I'm pretty sure it's body repair But it also maybe energy
Explanation:
Answer: A.
Explanation:
the science or study of how man and animals perform tasks and solve certain types of problems involving use of the body.
Hope this helps!....(bruh this was tuff)
If Maria winks exactly 5 times every minute while she is awake and she sleeps exactly 8 hours a day, how many times does Maria wink in a day? winks/day.
Answer:4,800
Explanation:
5 winks a minute, 60 minutes in an hour.
300 winks an hour, 16 hours a day.
4,800.
Answer:
The answer is 4,800 winks per day.
Explanation: There are 24 hours in a day, 24 minus the 8 hours shes asleep is 16. There are 60 minutes in an hour. 5 x 60 is 300. 300 winks an hour multiplied by the 16 hours she's awake is 4,800.
Solids are usually: equal in density to other phases more dense than liquids less dense than gases
Answer:
more dense than liquids
Explanation:
compare and contrast gymnosperms and angiosperms
(JSYK: this is technically biology)
Anyways, a gymnosperm is a plant (usually a tree) that has unprotected seeds, this means it bears no fruits and can include (but are not limited to) connifers, cycads, and the ginko. Angiosperms produce flowers to help fertilization and have protected seeds. They are also likely to produce fruits or vegetables.
Hope this helps, if not, comment down below please!!!
You are an employee at "cash for gold" and a customer comes in looking to exchange gold for money. They claim to have 3.47 gram nugget of fold. How many particles (atoms) of gold are in one nugget? With work shown
Answer:
The number of atoms in 3.47 gram nugget of gold is approximately 1.0606 × 10²² atoms
Explanation:
The given mass of gold = 3.47 grams
The molar mass of gold = 196.96657 g/mol
The number of moles of gold in 3.47 grams of gold = 3.47 grams/(196.96657 g/mol)
The number of moles of gold in 3.47 gram nugget of gold = 0.01762 moles
The number of atoms in one mole of gold = 6.02 × 10²³ atoms
The number of atoms in 0.01762 moles of gold = 6.02 × 10²³ atoms/mole × 0.01762 moles
The number of atoms in 0.01762 moles of gold ≈ 1.0606 × 10²² atoms
∴ The number of atoms in 3.47 gram nugget of gold ≈ 1.0606 × 10²² atoms.
WILL GIVE 5 STAR RATING AND BRAINLIEST IF YOU ANSWER FIRST AND CORRECTLY
What are the total number of elements in C₄H₉OH ?
Which energy transformations occur when a candle burns?
Thermal energy transforms into mechanical energy and radiant energy.
Chemical energy transforms into thermal energy and electrical energy.
Thermal energy transforms into radiant energy and chemical energy
Chemical energy transforms into thermal energy and radiant energy.
Answer:
D - Chemical energy transforms into thermal energy and radiant energy
Explanation:
Correct on edge 2020
Answer:
(D)
Explanation:
Chemical energy transforms into thermal energy and radiant energy.
Dashawn has to find the volume of his phone for science
class. He uses a ruler to measure its length, width, and
height and finds the following:
| = 17 cm
w = 7.5 cm
h = 0.8 cm
What is the volume of Dashawn's phone?
Answer: Volume of rectangle = L * W * H
Explanation: Multiply the 3 numbers together
Answer:
volume = L x W x H
V= 17 x 7.5 x 0.8
V = 102 cm^3
Explanation: Multiply the three number.
To find the volume, you multiply length times width times heigh
Pleaseee help it’s timed!!
Answer:
voliiviloou
Explanation:
volaiviolu
Answer:
Rows
Explanation:
Using the table on the right, perform the following metric unit conversions. Type your answer in the space provided.
0.001087 kg =
g
Answer:
1.087g
Explanation:
you can use the reminder King Henry Died By Drinking Chocolate Milk. You wanna that the period and move it right 3 times till you get to by.
Answer:
The first answer is 0.001087 kg = 1.087 g
The second answer is 25 mL = 0.025 L
Then the third answer is 531 ms = 0.531 s
I have a test in chem soon can any one help me?
Answer:
I will be glad to
This chart shows characteristics of three different types of atoms.
A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?
Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.
Atom X will accept electrons from Atom Y.
Answer:
B) Atom X will accept electrons from Atom Y.
Explanation:
because X has 6 electrons and Y has 2 it would make sense for Y to give to X
A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the student's percent error? Identify the element. What is the boiling of this element in Celsius degree
Answer:
Explanation:
percentage error = error x 100 / correct value
= (2.73 - 2.70) x100 / 2.70
= 1.11 %
The element is Aluminium whose density is 2.702 grams / cc
Boiling point of Aluminium = 2519⁰C .
how are electrons arranged in elements with atomic numbers 1 through 10?
Answer:
See explanation
Explanation:
For elements with atomic numbers 1-10, the arrangement of electrons is as follows; 1s 2s 2p.
These elements are found in the second period that commences at lithium and ends in neon.
The ten electrons that may be found in the atoms of these elements are arranged in orbitals as shown above.
According to Bohr, why don't the electrons fly off into space?
Answer:
because Electrons are not little balls that can fly
Explanation:
What is an indicator? What does it tell you about solutions?
Answer:
Pure water is neutral, and so is petrol. An indicator is a substance that changes colour when it is added to acidic or alkaline solutions. You can prepare homemade indicators from red cabbage or beetroot juice - these will help you see if a solution is acidic or alkaline.
help quick please?????
Answer:
the core
Explanation:
Answer:
3rd option, the core.
Explanation:
How does an increase in the annual melt season in Antarctica have a global effect?
a.
It causes an increase in heat related illness and death.
b.
It causes the global concentration of carbon dioxide to decrease.
c.
The water in the melting glaciers can cause sea levels to rise.
d.
None of the above is true.
Please select the best answer from the choices provided
A
B
C
D
Answer:
The correct answer is option "C"
The water in the melting glaciers can cause sea levels to rise.
The increase in annual melt season indicates a prolonged melting (hot) season which is primarily due to the impact of global warming. Global warming is increasing the highest temperature mark in the hot seasons on the planet which is adversely affecting the polar regions of earth. The ice in these Polar Regions has started melting. This ice when converted into liquid form flows through regions to reach sea and oceans and thus causes the rising of sea level
The annual melt season in Antarctica produces a global effect because the water in the melting glaciers can cause sea levels to rise.
What is the annual melt season?The annual melt season refers to a period of time when the ice in cold and polar regions of the world begin to melt to form warm.
The melting of ice in these regions such as Antarctica results in a rise in the global sea levels.
Therefore, the annual melt season in Antarctica produces a global effect because the water in the melting glaciers can cause sea levels to rise.
Learn more melt season at: https://brainly.com/question/1476419
#SPJ2
in your own words describe the process of a physical change
Answer:
A physical change is when the form of an object changes, but the substance stays the same.
Example: Ice melting into water.
Which of these elements has an electron configuration of [Kr]5s2?
barium
calcium
rubidium
strontium
Strontium has an electron configuration of [Kr]5s²
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
s: 2 electrons
p: 6 electrons
d: 10 electrons and
f: 14 electrons
From an electron configuration of [Kr]5s² can be concluded :
element is in period 5 (5 = shell)element is group 2(valence electron =2 and block s) has atomic number 38 (Kr = 36 + 2(valence elektron from 5s²)If we look at the periodic system, the elements that meet the requirements in question are Strontium (Sr)
Answer:
D) strontium
Which of the following is the best structure for CH2O2? Explain your reasoning.
Answer:
I'm guessing structure 1
Answer:
no
Explanation:
no
What is a Testable question I can use for tennis balls
Answer:
How long does it take for a tennis ball to fall from a certain height if recorded in different weather?
Explanation:
Can I have brainliest?
Answer:
How far can a ball travel if thrown during different wind speed?
Explanation:
Brainliest Plzzz!!!
Egg + Heat
Proof of a Chemical Reaction
Answer:
Water+Heat
proof of physical reaction
Explanation:
Chemical reactions are reactions that can't be undone ex cooking and egg.
Physical reactions are reactions that can be undone ex boiling water.
Answer:
Egg + Heat = Chemical Change
Explanation:
This is a chemical change because it cannot be undone. Once it changed its form you could not revert it back to its original self.
I hope this helps you! :)))))
Wich statement best describes the progress of science
Answer:
Scientific ideas are changed when better ones are found.
Explanation: