ANSWER ASAP GIVING BRAINLIEST!Please answer the following essay question with 5-7 sentences.
How is a chemical change different from a physical change?
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Answer:
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed.
Answer:
In a physical change the state or physical appearence of the matter changes but the kind of matter in the substance does not. In a chemical change, the compostition of matter changes. One new substance with a unique properties is made.
Step-by-step explanation:
Related Questions
Find each probability.
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Answer:
5,9
Step-by-step explanation:
I think row A would be 5 and B would be 9 im sorry if im wrong
5 on top 9 on bottom
A project will take a total of 720 person-days to complete. If the project must be completed in 30 days, how many people must be employed? PLEASE HURRY
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Answer:
192 hours per day / 8 hours per person per day = 24 people
Step-by-step explanation:
Assuming each person works for 8 hours a day, the total number of hours needed to complete the project is:
720 person-days x 8 hours = 5,760 hours
To complete the project in 30 days, the total number of hours needed per day is:
5,760 hours / 30 days = 192 hours per day
Can any of you math wiz help me I am having trouble.
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Answer:
1 - True
2 - False
3 - False
4 - True
Step-by-step explanation:
N/A
Solve the equation −12 + x = −16 for x.
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Answer:
-4
Step-by-step explanation:
First, add 12 on both sides and then you must end up with - 4
move the constant to the right and change sign , calculate the sum.
-3y + 12 = -48
what number is the y
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Have a great day
Three pieces of strings have a length of 124 cm, 286 cm and 320 cm respectively. Each string is cut into several pieces of the same length and no string is left over. What is the length of the longest piece of string?
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Answer:10
Step-by-step explanation
Because Each string is cut into several pieces of the same length and no string is left over.
What mixed number represents 30/8
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Answer:
3 6/8
Step-by-step explanation:
30÷8=3 6/8
8×3=24
30-24=6
Answer:
The mixed that represents 30/8 is --> 3 3/4
Step-by-step explanation:
Step 1: Find the whole number
We first want to find the whole number, and to do this we divide the numerator by the denominator. Since we are only interested in whole numbers, we ignore any numbers to the right of the decimal point.
30/8= 3.75 = 3
Now that we have our whole number for the mixed fraction, we need to find our new numerator for the fraction part of the mixed number.
Step 2: Get the new numerator
To work this out we'll use the whole number we calculated in step one (3) and multiply it by the original denominator (8). The result of that multiplication is then subtracted from the original numerator:
30 - (8 x 3) = 6
Step 3: Our mixed fraction
We've now simplified 30/8 to a mixed number. To see it, we just need to put the whole number together with our new numerator and original denominator:
3 6/8
Step 4: Simplifying our fraction
In this case, our fraction (6/8) can be simplified down further. In order to do that, we need to calculate the GCF (greatest common factor) of those two numbers. You can use our handy GCF calculator to work this out yourself if you want to. We already did that, and the GCF of 6 and 8 is 2.
We can now divide both the new numerator and the denominator by 2 to simplify this fraction down to its lowest terms.
6/2 = 3
8/2 = 4
When we put that together, we can see that our complete answer is:
3 3/4
A chemist prepares two acid solutions.
Solution 1
3 parts sulfuric acid to 7 parts water
Solution 2
4 parts sulfuric acid to 9 parts water
a. Use a ratio table to determine which solution is more acidic.
Solution 1 Solution 2
Water Sulfuric Acid
Water
Sulfuric Acid
7
9
21
18
42
45
63
63
Question 2
Solution
has the greater concentration.
Question 3
b. Use a graph to determine which solution is more acidic.
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Both graphs begin at $($ Response area, Response area $)$ . The graph for solution Response area is steeper, so it has Response area concentration of acid.
Answers
Answer:
Check Description for answer
Step-by-step explanation
do it urself
Answer:
A) solution 2 is more acidic than solution 1
Step-by-step explanation:
A chemist prepares two acid solutions:
Solution 1: 3 parts sulfuric acid to 7 parts water
Ratio of sulphur to water: 3/7 (3:7)
Solution 2: 4 parts sulfuric acid to 9 parts water
Ratio of sulphur to water: 4/9 (4:9)
___________________________________________________
Part A: (using ratios to determine which solution is more acidic)
First we make same denominator, since the denominators are 9 and 7, we have to find the lcm (lowest common multiple) they both have with is 63. To do that, we must multiply the denominators with either 7 or 9.
Solution 1: Numerator (3) multiplied by 9 and then denominator (7) multiplied by 9. This makes out fraction/ratio 27/63
Solution 2: Numerator (4) multiplied by 7 and then denominator (9) multiplied by 7. This makes out fraction/ratio 28/63
Since 28/63 (or just 28) is a larger quantity than 27/63 (or just 27) this means solution 2 is more acidic than solution 1.
Mathematical Line (Not sure what you would call this lol): 28 > 27
Part B: (Let 'y' amount of sulfuric acid mix with 'x' amount of water)
Equation of solution 1: y = 3/7x
Equation of solution 2: y = 4/9x
Please find attachment for graph.
Part C: Don't have a graph, sorry! (part a. method is more preferred to find more acidic because it gives the actual acidic amount.)
I need these answers quick, thank you.
the following scatter diagram shows two sets of data that show high positivity correlation
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Kenneth graphed a system of equations.
Kenneth says the system has no solution
Do you agree?
Yes or No
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Farmers have long used aquifers as a source of groundwater for irrigation, but when water is conserved, they have to dig even deeper into the Earth to extract the water they need. Which argument do you believe that farmers will face using this process?
Argument 2: This is an affordable process and it can have a huge impact on the agriculture industry.
Argument 3: Groundwater is a valuable resource in the United States only and farmers will not have a problem with needing water for their crops.
Argument 4: Groundwater is a valuable resource in the United States and throughout the world, but farmers have an unlimited supply.
Argument 1: This is a costly process and it can have a huge impact on the agriculture industry.
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Answer:
Argument 1.
Step-by-step explanation: This is not cheap, and if becomes impossible or to costly, the farm industry will collapse. food shortages sure will follow.
Answer:
I believe it's argument 2.
Explanation:
Farmers don't have to pay to dig for water.
Keira said that if 6 tickets are sold, there should be 2 tickets left. Is Keira correct?
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According to Keira, if 6 tickets are sold, there should be 2 tickets left. However, we don't have any information about the initial number of tickets available.
If the total number of tickets initially was 8, and 6 tickets were sold, then there would indeed be 2 tickets left, supporting Keira's statement.
However, if the total number of tickets initially was less than 8, or if the statement doesn't specify the initial number of tickets, we cannot determine if Keira's statement is correct.
Therefore, without additional information, we cannot determine the accuracy of Keira's statement.
Help PLEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEASE
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Answer:
y = 7x - 16
Step-by-step explanation:
slope = y2-y1/x2-x1
slope = 12 - (-9)/4-1
slope = 7
Y-intercept = -9-7
Y-intercept = -16
Y = 7x-16
I think this is correct check
SUBTRACT 99 POINTS FROM MIXED NUMBERS, PLEASE PROVIDE PROOF!
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Answer:
2 5/18Step-by-step explanation:
7 2/3 - 3 1/6 - 2 2/9 = Given 7 12/18 - 3 3/18 - 2 4/18 = Bring to common denominator of 18(7 - 3 - 2) + (12 - 3 - 4)/18 = Group integers and fractions2 + 5/18 = Simplify2 5/18 AnswerThe first step is to find a common denominator. (I will be using • to represent multiplication) The lowest common denominator that 3, 6, and 9 share is 18.
3 • 6 = 18
6 • 3 = 18
9 • 2 = 18
To rewrite your numbers using 18 as a denominator, you must multiply the numerator and denominator by the same number.
Since 3 • 6 = 18, 7 2/3 will be rewritten as
7 12/18 (since 2 • 6 = 12) we don’t have to worry about the whole number (7), so leave it as it is.
3 1/6 can be rewritten as
3 3/18, since 6 • 3 = 18 and 3 • 6 = 18
Once again we leave the whole number alone
2 2/9 can be rewritten as
2 4/18, since 9 • 2 = 18 and 2 • 2 = 4
Now we simply subtract our whole numbers and our fractions. Let’s first subtract our whole numbers.
7 - 3 - 2 = 2
Now we can subtract our fractions. Remember that when we subtract fractions, the denominator stays the same. In other words, we only subtract the numerator and ignore the denominator.
12/18 - 3/18 - 4/18 = 5/18
Therefore youre solution is
2 5/18
If you have any questions either about this equations or any other problems within this topic just reply under this answer and I’ll do my best to assist you! Hope this helps and good luck!
PLS HELP! ASAP!
Which relationships describe the angle pair x° and 71º?
Select each correct answer.
supplementary angles
vertical angles
adjacent angles
complementary angles
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Answer:
complementary angles
Step-by-step explanation:
it's a 90 degree angle added together (notice the square in the corner?) hope this helps!
Please help! This is due in 3 minutes!
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Please I need help ASAP
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Answer:
5/36
Step-by-step explanation:
I need to finish this Monday. I missed the lesson. I don't know what to do. We have to answer them with pattern blocks. The third picture is an example.
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Have you tried to look at the links?
respond with info.
what point below is the solution to the expression 2x+y=12
A) (4,2) C) (8,-1)
B) (3,6) D) (0,6)
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Answer:
Step-by-step explanation:
It's B.
Let's rewrite the expression like this :
2x+y=12 ⇒ y=12-2x
and try given values for x :
if x=4 ⇒ y=12-(2×4)=12-8=4 ( so it is not 2 ) ⇒ wrong if x=3 ⇒ y=12-(2×3)=12-6=6 (it is 6) ⇒ right if x=8 ⇒ y=12-(2×8)=12-16=-4 (so it is not -1) ⇒ wrong if x=0 ⇒ y=12-(2×0)=12-0=12 (so it is not 6) ⇒ wrongFind the value of the expression when a= -8 and b= -2
a^2-b^2=
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Find the missing angle in a triangle with the given sides.
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Answer:
Step-by-step explanation:
44 + 99 + x = 180
143 + x = 180
x = 37
G = 37[ ]= 180-99-44= 37
Evaluate.
4 to the power of 3
Answers
Answer:64
Step-by-step explanation:
it means you should mutliply 4 with itself 3 times:
4*4*4=64
Answer:
64
Step-by-step explanation:
4^3 = 4*4*4=64
please help me i will give brainliest to first person to anwser.
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First we start with the formula for cylinders v=(pi)r(squared)h filled in Thats v=(3.14)(8 squared) (8) which brings us to the answer 1607.68 but you must round to the nearest tenth aka 1607.7
Answer:
The first option, V ≈ 1607.7 in²
Step-by-step explanation:
Find the volume of the given cylinder.
\(\begin{center}\framebox{\parbox{4cm}{\textbf{Volume of a Cylinder:}\\[2ex]The volume of a cylinder with radius $r$ and height $h$ is given by the formula:\\[2ex]\center{$V = \pi r^2 h$} \\ \\}}\end{center}\)
Given:
r = 8 in
h = 8 in
π = 3.14
Find:
V = ?? in³
\(\hrulefill\)
Now solving,
Substitute the given values into the formula:
=> V = (3.14)(8)²(8)
Using a calculator to simplify:
=> V = 1607.68 in²
Rounded to the nearest tenth:
∴ V ≈ 1607.7 in²
Thus, the first option is correct.
The following scenario is for #7, 8, 9, and 10 on this test.* A sign in a bakery gives the following options: Option A is 12 cupcakes for $30. Option B is 24 cupcakes for $66. Option C is 50 cupcakes for $129. What is the cost of one cupcake for Option C?
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Answer: $2.58
Step-by-step explanation: 129 ÷ 50 = 2.58
Answer the questions below.
(a)
The perimeter of the rectangular garden is 330 m.
If the width of the garden is 77 m, what is its length?
Length of the garden: [] m.
(b)
The area of a rectangular window is 6734 cm².
If the length of the window id 91 cm, what is its width?
Width of the window [] cm.
Answers
(A):88
(B):74
Explanation:
For (A), first multiply 77 by 2 then subtract from 330
77x2=154
330-154=176
For (A), second divide 176 by 2
176/2=88
Length=88
For (B), divide 6734 by 91
6734/91=74
Hope this helps!
Answer:
(a) 88 m
(b) 74 cm
Step-by-step explanation:
You want the length of a garden with a perimeter of 330 m and a width of 77 m, and you want the width of a window with an area of 6734 cm² and a length of 91 cm.
(a) PerimeterThe perimeter of a rectangle is given by the formula ...
P = 2(L +W)
Filling in the given values, we can find the unknown.
330 = 2(L +77)
165 = L +77 . . . . . . . divide by 2
165 -77 = 88 = L
The length of the garden is 88 meters.
(b) AreaThe area of a rectangle is given by the formula ...
A = LW
Filling in the given values, we can find the unknown.
6734 = 91W
6734/91 = 74 = W
The width of the window is 74 cm.
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-3 + 6x. Which expression shows the correct factorization?
Here are the ones to pick from
1. -2 + -2 +6 +x
2. 6(-2 +x)
3. 6(-2 +x)
4. -3 (1 - 2x)
Answers
Answer:
Option #4
Step-by-step explanation:
Expand option #4
=-3(1-2x)
=-3 -2x*-3
=-3+6x which is what your original equation was.
All the dimensions of a cuboid are whole numbers, and its volume is 24 units^3. Which one of the following could NOT be one of its dimensions?
A.) 3
B.) 4
C.) 5
D.) 6
First Person who gets it right and EXPLAINS will get branliest! :-)
Answers
5 is the answer.
Review:What is a cuboid?
A cuboid is a rectangle, but in 3D form.
Do we calculate area or volume in a cuboid?
We calculate the volume for 3D shapes. For 2D shapes, area is used.
If/Then:
Now, if the volume of the cuboid is 24 units³ then:
x × x × y
Now, lets fit all our options to see which one is NOT the dimensions.
Option A:
x × x × 3 = 24 units³
x × x = 12 units³ ✔
This is possible.
Option B:
x × x × 4 = 24 units³
=> x × x = 6 units³ ✔
This is possible.
Option C:
x × x × 5 = 24 units³
=> x × x = 24/5 units³ ❌
This is not possible. This will be our answer.
Option D:
x × x × 6 = 24 units³
=> x × x = 4 units³✔
This is possible.
Conclusion:
So after working on our problem, we can conclude that C is our answer. Hoped this helped.
Find the volume of the sphere. Include proper units:
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Answer:
14137.17
Step-by-step explanation:
The problem/questions are in the image below.
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Hi there! :)
We can begin by writing algebraic equations to express both of the situations. Use the format y = mx + b (slope-intercept form) to display the cost of each:
Recall that:
m - rate of change of cost (ex: amount per guest)
b - initial charge (ex: cost to rent the room)
Write the equations given the information in the table:
Bowling-Fun: y = 4x + 250
Arcade-A-Rama: y = 9x + 120
Part A.
Solve for the number of guests that would result in a same price from both locations by setting the two equations equal to each other:
4x + 250 = 9x + 120
Begin solving by subtracting 4x from both sides:
250 = 5x + 120
Subtract 120 from both sides to further isolate x:
130 = 5x
Divide both sides by 5:
x = 26 guests.
Part B.
Find the less expensive choice by plugging in the amount of guests (80) for x:
Bowling-Fun: y = 4(80) + 250 = $570
Arcade-A-Rama: y = 9(80) + 120 = $840.
$570 < $840
Therefore, Bowling-Fun is the cheapest option for 80 guests.
Part C.
The slope represents the rate of change. In this instance, this is the amount per guest, which is $4 dollars.
Part D.
The y-intercept represents the initial, one-time amount. This is the amount paid for the room, which is $120.
Positive numbers are greater than negative numbers as well a zero. Positive numbers are represented to the right of zero on the number line.
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Answer:
that's true
Step-by-step explanation: