Chemical changes in mixtures can be identified by the creation of a new substance, a change in color or odor, production of gas, or formation of a precipitate. When two clear liquids change color or form a new solid upon mixing, as happens with silver nitrate solution and copper wire, or potassium iodide and lead nitrate, a chemical change has occurred.
Explanation:In order to identify which of the four mixtures has undergone a chemical change, we need to look for indications of that change. There are several telltale signs of a chemical reaction. Such signs include the creation of a new substance, a change in color or odor, the production of gas (bubbles), or the formation of a precipitate (a solid that forms from a liquid mixture).
If two clear liquids mix and then change color, as seen when copper wire is immersed in an aqueous solution of silver nitrate and the solution turns blue, a chemical change has likely occurred. The copper wire also becomes covered with a gray solid, demonstrating the creation of a new substance. Another example is when two solutions, potassium iodide and lead nitrate, mix and form a solid, or precipitate, of lead iodide. This is another clear indication of a chemical change.
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The mixture demonstrating a chemical change would exhibit characteristics such as a change in color, gas evolution, precipitate formation, or temperature change, indicating the formation of new substances.
In order to identify which mixture demonstrates a chemical change, it's essential to understand the characteristics of physical and chemical changes. Physical changes involve alterations in the state or appearance of a substance without forming new substances. On the other hand, chemical changes result in the formation of new substances with distinct properties.
If one of the mixtures exhibits a change in color, the evolution of gas, the formation of a precipitate, or a change in temperature, it suggests a chemical change. These are indicative of chemical reactions where bonds between atoms are broken and new ones are formed.
For instance, if a mixture produces a gas with effervescence, it implies the release of a new substance. Similarly, if a color change occurs, indicating the formation of a new compound, or if a solid precipitate forms, these are strong indicators of a chemical change.
Observing these characteristics in a mixture would signify a chemical reaction between the clear liquids, indicating the occurrence of a chemical change. It's crucial to analyze the physical and chemical properties of each mixture to pinpoint the one that demonstrates such transformative chemical processes.
A fair coin has been tossed 6 times and come up heads each time. What is the probability that the next toss will also be heads? A) 1 /12
B) 1/ 2 C) 1 3 D) 1/6
Answer:B
Step-by-step explanation:
Answer:
1/2
Step-by-step explanation:
x2y - 2xy - 24y = y(x2 - 2x - 24) What is the completely factored form of x2y – 2xy – 24y? (xy + 4)(x – 6) xy(x + 4)(x – 6) y(x + 4)(x – 6) y(x + 4)(xy – 6)
The required factorized form of the given expression is y(x - 6)(x + 4), where y is the greatest common factor (GCF).
What is the Factorization?
Factorization, also known as factoring, is the breakdown of one element into a product of other objects, or factors, which when multiplied together generate the original.
We have been given that the expression below as
x²y - 2xy - 24y
We have to determine the factor of the expression 50x + 100
First, we have to find the Greatest Common Factor (GCF).
GCF = y
y Factor out the GCF. (Write the GCF first. Then, in parentheses, divide each term by the GCF.)
y(x² - 2x - 24)
Simplify each term in parentheses.
y(x² - 2x - 4x - 24)
y(x - 6)(x + 4)
Therefore, the required factorized form of the given expression is y(x² - y(x - 6)(x + 4)
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The completely factored form of x²y - 2xy - 24y is y(x + 4)(x - 6).
Explanation:The completely factored form of x²y - 2xy - 24y is y(x + 4)(x - 6).
To factor the given expression, we can factor out the common term 'y' from all three terms: y(x² - 2x - 24). Then, we factor the quadratic expression inside the parentheses: (x + 4)(x - 6). Combining these factors, we get y(x + 4)(x - 6), which is the completely factored form of the given expression.
How do you write 75% as a fraction.
There is not much that can be done to figure out how to write .75 as a fraction, except to literally use what the decimal portion of your number, the .75, means. Since there are 2 digits in 75, the very last digit is the "100th" decimal place. So we can just say that .75 is the same as 7/100.
A weather research airplane began descending from an altitude of 36000 feet above its base at a rate of 125 feet per minute how long did it take for the plan to land at its base
Section a of a theater contains 12 rows of 15 seats each section b contains only 10 rows but had the same number of seats as section a
The question involves understanding multiplication and division principles. Section A has 180 seats in total (12 rows * 15 seats). Section B, having the same total number of seats but only 10 rows, would have 18 seats per row.
Explanation:The question involves the basic principles of mathematics, specifically dealing with multiplication and division concepts. Section A of the theater has 12 rows of 15 seats each, which totals to 180 seats (12 * 15 = 180). As it is stated that Section B has the same number of seats as Section A but only consists of 10 rows, each row in Section B must, therefore, contain 18 seats (180 / 10 = 18).
This is an application of the principle that if a total quantity remains the same, and it is divided into fewer groups, then each group will contain more than before. Therefore, even though Section B has fewer rows than Section A, each row in Section B contains more seats, leading to the same total.
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There are 18 seats in each row of Section B.
To find out how many seats are in each row of Section B, let's first calculate the total number of seats in Section A:
Total seats in Section A = 12 rows × 15 seats per row = 180 seats
Since Section B has the same total number of seats as Section A but only 10 rows, we can find out how many seats are in each row of Section B by dividing the total number of seats in Section B by the number of rows in Section B:
Seats per row in Section B = Total seats in Section B / Number of rows in Section B
We already know the total seats in Section B is 180, and the number of rows in Section B is 10.
Let's plug these values into the formula:
Seats per row in Section B = 180 seats / 10 rows = 18 seats
The complete question is-
In a theater, Section A contains 12 rows of 15 seats each. Section B has the same total number of seats as Section A but contains only 10 rows. How many seats are in each row of Section B?
what is 48 over 25 rounded to the nearest quarter of an inch
I rounded it to 2 inch
A quadratic equation of the form 0=ax^2+bx+c has a discriminant value of -16. How many real number solutions does the equation have?
None
If the discriminant b² - 4ac < 0
There are no real solutions
The equation has no real solutions because the discriminant is -16.
What is a quadratic equation?A quadratic equation is the second-order degree algebraic expression in a variable. the standard form of this expression is ax² + bx + c = 0 where a. b are coefficients and x is the variable and c is a constant.
We are given the quadratic equation by;
ax² + bx + c = 0
By using the quadratic formula,
x = [-b ± √b² - 4ac]/2a
The discriminant of a quadratic equation explains the nature of the roots of that quadratic equation.
If the discriminant is negative, then the equation has no real roots.
If the discriminant us positive, then the equation has two real roots.
If the discriminant is zero, then the equation has a repeated root.
Since the discriminant is -16, then the equation has no real roots.
b² - 4ac < 0. There are no real solutions
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Which values have exactly 2 significant figures? Check all that apply.
A. 302 yards
B. 980 gallons
C. 1,200 feet
D. 84 liters
E. 6,040 meters
ANSWER
Options B, C and D have exactly 2 significant figures.
EXPLANATION
To see whether the numbers have exactly 2 significant figures, round all to 2 significant figures. The ones that remains the same have exactly 2 significant figures.
[tex]302\approx 300[/tex]yards to 2.s.f
[tex]980\approx 980[/tex]gallons to 2.s.f
[tex]1200\approx 1200[/tex]feet to 2.s.f
[tex]84\approx 84[/tex]litters to 2.s.f\
[tex]6,040\approx 6,000[/tex]meters to 2.s.f
Given: 2/3x-7=4/3x-9 prove: x=3 set up a 2 column proof and complete each
I have attached a picture which clearly explains.
pls help. i am new and i want to know if thise app works
aw yeah hon it works :) welcome. -20
An airplane is flying 2250 feet in the air. A submarine submerged 1300 feet below sea level. What is the difference in elevation between the airplane and the submarine?
2250+1300= 3550 and that is your answer
L+15.2=-4.5
Solve for L explain
Identify the constant of proportionality in the equation. 5y = 35x A) 1 B) 5 C) 7 D) 35
Answer:
It's 7
Step-by-step explanation:
5y=35 the easiest way is 35/5=7 7x5=35
The value of constant of proportionality in the equation. 5y = 35x is,
⇒ 7
What is Division method?Division method is used to distributing a group of things into equal parts. Division is just opposite of multiplications.
For example, dividing 20 by 2 means splitting 20 into 2 equal groups of 10.
Given that;
The equation is,
⇒ 5y = 35x
Now, We can find value of constant of proportionality in the equation as,
⇒ 5y = 35x
Divide by 5;
⇒ y = 7x
Thus, The value of constant of proportionality in the equation. 5y = 35x is,
⇒ 7
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An international company has 25,900 employees in one country if this represents 21.7% of the company’s employees how many employees does it have in total?
Round your answer to the nearest whole number
A box contains 48 marbles.two-thirds of the marbles are red. Three fourths of the red marbles are striped. How many of the marbles in the box are red and have stripes.
24
Simply multiply all of the fractions with the total number of marbles
48(2/3)(3/4)
Final answer:
There are 24 marbles that are red and have stripes in the box, calculated by first determining the total number of red marbles (32) and then finding three-fourths of those to be striped.
Explanation:
The question involves finding out how many red and striped marbles are in a box, given that two-thirds of the marbles are red and three-fourths of the red marbles are striped. There are 48 marbles in total.
To find the total number of red marbles, we multiply the total number of marbles by two-thirds:
48 marbles × ⅓ (red marbles) = 32 red marbles
Next, to find out how many of the red marbles are striped, we multiply the number of red marbles by three-fourths:
32 red marbles × ¾ (striped marbles) = 24 striped red marbles
So, 24 of the marbles in the box are red and have stripes.
angle works at AutoZone and makes $72 dollars a day and extra $8 for each platinum membership card he sells. angles goal is to make $200 today. how many memberships cards must he sell?
Angle needs to sell 16 membership cards.
First, I subtracted 72 from 200 and that gave me 128. Then, I divided 128 by 8 and got 16. To check my work I multiplied 16 by 8 and got 128. Then I added 72 to 128 and got 200.
Hope this helps!
Create four equations using 9, 54 and 6 fact families
These would be 2 of the 4 equations, because 6 times 9 equals 54 and 9 times 6 equals 54, but are written in a different way. Thus meaning they are 2 of the 4 equations.
54/6 = 954/9 = 6These 2 would be the final to, because 54 divided by 6 is 9, and 54 divided by 9 is 6. Thus meaning they are the final 2 equations.
I hope this helps!
-7 + 4n = 9
Show your work!
First of all, add 7 to both sides, in order to cancel the -7:
[tex] -7 + 4n +7= 9+7 [/tex]
As we said, the -7 on the left hand side cancels out, while we can add it to the 9 on the right hand side:
[tex] 4n = 16 [/tex]
Now, divide both sides by 4. As before, this is needed to cancel the four on the left hand side and isolate the x, while it is just a normal division between numbers on the right:
[tex] \dfrac{4n}{4} = \dfrac{16}{4} \iff x = 4 [/tex]
Rewrite the equation in an easier way: 4n-7=9
Add 7 to both sides: 4n-7+7=9+7... 4n=16
Divide both sides by 4: 4n/4=16/4
ANSWER: N=4
Hi can you guys help me? In 1,2,3 and 4?
Given the function, complete the table of values then graph the ordered pairs.
1. 3, -1, -5, -9
2. -5, -3, -1, 1
3. -2, 0, 2, 4
4. 6, 5, 4, 3
Hope this helps!
To complete the table of values and graph the ordered pairs for the function f(x) = 2x + 1, we substitute the x-values (1, 2, 3, 4) into the function to get the y-values (3, 5, 7, 9). The ordered pairs (1, 3), (2, 5), (3, 7) and (4, 9) are then plotted on the graph and connected with a line.
Explanation:Given a function, you can complete the table of values by substituting the given x-values into the function to find the corresponding y-values. Following this, you can plot the ordered pairs on the graph. Let's assume the function is f(x) = 2x + 1. For x = 1, 2, 3, 4, you get the ordered pairs (1, 3), (2, 5), (3, 7) and (4, 9) respectively. Draw the corresponding points on a graph and connect them with a straight line if it's a linear function.
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Shrina is selling cookie dogh for her soccer team. She sold 2 tubs of oatmeal raisin and 2 tubs of peanut butter. How much money did she make
Oatmeal - $6
Peanut butter - $5
$6 x 2 = $12
$5 x 2 = $10
$12 + $10 = $22
So Shrina made $22 selling cookie dough.
Hope this Helps!!
To accurately calculate the total amount of money Shrina made from selling the cookie dough, we need to know the price per tub for each type of cookie dough, which are oatmeal raisin and peanut butter.
This information is crucial to compute the answer. Hence, without the prices of the oatmeal raisin and peanut butter tubs, it is impossible to determine how much money Shrina made.
Generally, the calculation would look like this:
The total money earned from selling oatmeal raisin tubs would be the quantity of oatmeal raisin tubs sold multiplied by its price per tub. The same calculation would apply to the peanut butter tubs.
Assuming `oatmeal_raisin_price` and `peanut_butter_price` to be the price per tub of oatmeal raisin and peanut butter respectively, and the quantity sold be represented by `oatmeal_raisin_qty` and `peanut_butter_qty`, the total money made, `money_made` would be:
money_made = (oatmeal_raisin_price * oatmeal_raisin_qty) + (peanut_butter_price * peanut_butter_qty)
The above formula would give us the total amount Shrina made from selling the cookie dough. But without the price of each tub, we can't proceed with the calculation.
24/22 = x/77
What is x?
Answer:
The answer is x=84
Step-by-step explanation:
Step 1 X/77
Equation at the end of step 1 24/22 - x/77= 0
Step 2 Simplify 12/11
Equation at the end of step 2 12/11 - x/77 =0
Find lest common multiple left denomaintor is 11 and Right is 77
Now its 12*7-(x)/77= 84-x/77
84-x/77 *77= 0 * 77
subtract 84 from both sides -x=84 multiply both sides of the equation by (-1): x =84
So your answer is 84
24 : 22 = x : 77
x = 24 * 77 : 22
x = 84
-------------------------
24 : 22 = 1,090909090909091
84 : 77 = 1,090909090909091
the answer is good
3/8 ×4/5 = in simplest form
Final answer:
To find 3/8 multiplied by 4/5, multiply the numerators together and the denominators together and then simplify the resulting fraction. The solution in simplest form is 3/10.
Explanation:
To multiply two fractions, you multiply the numerators (the top numbers) together and the denominators (the bottom numbers) together. For the multiplication of 3/8 × 4/5, we multiply the numerators 3 and 4 to get 12, and the denominators 8 and 5 to get 40.
The result of this multiplication is 12/40. However, this fraction can be simplified. We notice that both the numerator and the denominator are divisible by 4. Thus, we divide both by 4 to get the simplest form: 12 ÷ 4 is 3, and 40 ÷ 4 is 10, resulting in the fraction 3/10.
So, 3/8 × 4/5 in its simplest form is 3/10.
If you placed $1000 in a savings account with an interest rate of 4.5%/ month verses an account with 3.75%/ month, how much more interest could you earn in that month?
A- $1.25 more
B- $12.50 more
C- $7.50 more
D- $75.00 more
ANSWER:
C - $7.50
REASONING:
If I placed $1,000 in a savings account with an interest rate of 4.5% per month, I would earn $45 in one month.
$1000x.045=$45
If I placed $1,000 in a savings account with an interest rate of 3.75% per month, I would earn $37.50 in one month.
$1000x.0375=$37.50
I would earn an additional $7.50 in one month by placing the money in the savings account with the 4.5% interest rate.
$45-$37.50=$7.50
Clare made $160 babysitting last summer. She put the money in a saving account that pays 3% interest per year. If Clare doesn't touch the money in her account, she can find the amount she'll have the next year by multiplying her current amount by 1.03. (A) How much momey will Clare have in her account after 1 year? After 2 years? (B) How much momey will Clare have in her account after 5 years? Explain your reasoning. (C) Write an expression for the amount of money Clare would have after 30 years if she never withdraws money from the account.
Solution-
Clare made $160 babysitting last summer. She put the money in a saving account that pays 3% interest per year.
It is a condition of compound interest with annually compounding.
We know that,
[tex]P'=P(1+r)^n[/tex]
Where,
P' = the money she will be getting after n years,
P = the money she deposited = $160
r = annual rate of interest = 3% = 0.03
n = number of years
Money she will be getting after 1 year
[tex]\Rightarrow P'=160(1+0.03)^1=160\times 1.03=\$164.8[/tex]
This is why when she multiply 1.03 with her current amount, she gets the amount she will be getting after one year.
Money she will be getting after 2 year
Taking current balance as $164.8 as at the end of one year it will be the base amount on which interest will be calculated,
[tex]\Rightarrow P'=168.8(1+0.03)^1=168.8\times 1.03=\$169.74[/tex]
Again by multiplying 1.03 she can get the amount of money she will be getting next year.
Money she will be getting after 5 year
P' = the money she will be getting after 5 years,
P = the money she deposited = $160
r = annual rate of interest = 3% = 0.03
n = 5
Putting the values,
[tex]\Rightarrow P'=160(1+0.03)^5=160\times 1.1593=\$185.49[/tex]
She will be getting $185.49 after 5 years.
We can also do this by calculating the amount of money she will be getting at the end of each year and multiplying it with 1.03 in order to get the amount of money she will be getting the next year.
Expression for the amount of money Clare would have after 30 years if she never withdraws money from the account-
[tex]\Rightarrow P'=160(1+0.03)^30[/tex]
This is the expression for the desired condition.
The amount of money Clare would have in her account after one year is $164.80.
The amount of money Clare would have in her account after two years is $169.74
The amount of money Clare would have in her account after five years is $185.48.
The expression that can be used to determine the amount of money Clare would have in her account after 30 years is 160(1.03^30)
How much would Clare have in her account?The formula for calculating future value:
FV = P (1 + r)^n
FV = Future value P = Present value R = interest rate N = number of yearsBalance after one year = 160 x (1.03) = $164.80
Balance after five years = 160 x (1.03^5) = 185.48
Balance after two years = 160 x (1.03^2) = 169.74
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a store having a sell where everything 30 percent. off find the discount and the sale price if a comustor buys an item for 365$
The item is $365 and is 30% off.
What we need to do first is find 30% of $365. We can do this by multiplying
$365 x 0.3 = $109.5
The discount is $109.5
but what we need to pay is $365 - $109.5 = $255.5
The Sale price is $225. 5
GOOD LUCK :)
why do -3 2/7 and 3 2/7 have the same absolute value?
mrs payne needs 35 notepads she can buy them in packs of 10 notepads or as single pads what are all the different ways mrs payne can buy the notepade? find a pattern to solve choose two of the ways from the chart explain how thesetwo ways show the some number of notepads
Mrs. Payne can buy the notepads in 5 different ways: 0 packs, 1 pack, 2 packs, 3 packs, or 35 single pads. The number of notepads in each option is either a multiple of 10 or 35.
Explanation:To find all the different ways Mrs. Payne can buy the notepads, we need to consider two scenarios: buying in packs of 10 and buying as single pads. Let's start with buying in packs of 10. The number of packs Mrs. Payne can buy ranges from 0 to 3, since if she buys 4 packs she would have 40 notepads which is more than she needs. So the different ways she can buy notepads in packs of 10 are 0 packs, 1 pack, 2 packs, and 3 packs.
Next, let's consider buying single pads. If Mrs. Payne buys 35 single pads, she would exactly reach her requirement. So another way she can buy the notepads is by purchasing 35 single pads. In total, there are 5 different ways she can buy the notepads: 0 packs (0 notepads), 1 pack (10 notepads), 2 packs (20 notepads), 3 packs (30 notepads), or 35 single pads.
From the chart, we can observe that each option involves a multiple of 10 notepads except for the last option. This indicates that the number of notepads can be obtained by multiplying a whole number by 10, or in the case of 35 single pads, the count is not a multiple of 10.
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Arianna runs up 4 flights of stairs and then runs down 4 flights of stairs. Does this situation represent additive inverses?Explain.
Yes due to the fact that additive inverse is the oppsite. so she runs up +4 and runs down -4.
convert 9% into a decimal
0.09
Here is how yah do it
The easiest approach is to multiply a number in decimal format by 100. Move the decimal: Another way to convert from decimal to percentage format is to move the decimal two places to the right.
If im correct mark brainliest
Answer: 0.09
Step-by-step explanation: We can change a percent to a decimal by simply moving the decimal point two places to the left. In this example, we would simply move the decimal point two places to the left and we would fill in the missing position with a zero. Now, we can write 9% as 0.9 or 0.09. A common mistake that many people will make is writing 0.9 but you have to move the decimal two places to the left.
Deja enlarged quadrilateral A proportionally.She made each side 4 times as long.
Use the drop-down menus to complete the statements below.
The answer should be that the angles stayed the same.
An example for this would be a right angle. If you double the size of a right angle, the angle itself does not change. The size might, but not the angle itself. It is still going to be a right angle. This is the case with all other angles.
Answer:
16 and stayed the same
Step-by-step explanation: