1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kryger [21]
3 years ago
13

In an experiment, Seth was given a substance known as ammonium carbonate, (NH4)2CO3. Seth connected a bunsen burner to the gas v

alve using a gas hose. He turned on the gas valve and lit the bunsen burner. Using a test tube, Seth heated a piece of ammonium carbonate. Seth noticed the following:
- Condensation appeared on the sides at the top of the test tube.
- An ammonia smell was coming from the test tube.
Seth continued to light a wooden splint and stick it down the test tube and it immediately was extinguished.

Throughout this experiment, how many signs of chemical changes were observed and actual chemical changes took place?
A) 4
B) 5
C) 6
D) 7
Mathematics
3 answers:
ollegr [7]3 years ago
7 0

A is the best question

luda_lava [24]3 years ago
4 0

Answer                                

A) 4

hope this helps

XxTay1kXx2 years ago
0 0

5 is the correct answer

You might be interested in
Find the length of GF
Cerrena [4.2K]
By the Pythagorean Theorem:

The square of the hypotenuse (longest side) of a right triangle is equal to the sum of the side lengths squared, or mathematically:

h^2=x^2+y^2, where x and y are the side lengths and h is the length of the hypotenuse, in this case:

9.4^2=6.8^2+GF^2

GF^2=9.4^2-6.8^2

GF^2=42.12

GF=√42.12 units

GF≈6.49 units (to nearest hundredth of a unit)
3 0
3 years ago
Read 2 more answers
What is the volume of the can below? Use Pi = 3.14 and round your answer to the nearest tenth. A cylinder with height 96 millime
Serga [27]

Answer:

328,268 mm^3

Step-by-step explanation:

The can in this problem has a cylindrical shape. The volume of a cylinder can be calculated with the following formula:

V=\pi r^2 h

where

r is the radius of the base of the cylinder

h is the height of the cylinder

In this problem we have:

h = 96 mm is the height of the can

d = 66 mm is the diameter of the can

So the radius of its base is

r=\frac{d}{2}=\frac{66}{2}=33 mm

And therefore, the volume of the can is:

V=\pi (33)^2 (96)=328,268 mm^3

7 0
2 years ago
Read 2 more answers
Kayla buys two pairs of jeans for j dollars each and one shirt for 15 dollars. she has 60 dollars to spend. The equation 2j+ 15-
weeeeeb [17]

Kayla buys two pairs of jeans for j dollars each and one shirt for 15 dollars. The cost of one pair of jeans is $22.5  (twenty-two dollars and fifty cents)

From the given information

  • Let the cost of two pairs of jeans be 2j
  • The cost of 1 shirt = 15
  • Total amount to spent = $60

∴

The equation is said to be expressed as:

  • 2j + 15 - 60 = 0

Collect like terms

  • 2j = 60 - 15
  • 2j = 45

Divide both sides by 2

  • \mathbf{\dfrac{2j}{2}= \dfrac{45}{2}}
  • j = 22.5

Therefore, we can conclude that the cost of one pair of jeans is  $22.5  (twenty-two dollars and fifty cents).

Learn more about cost here:

brainly.com/question/13910351?referrer=searchResults

5 0
2 years ago
Jasmine buys 3 T-Shirts and 3 Hats for $11.25. The next day, he buys 4 T-Shirts and 2 Hats for $10. How much does each T-Shirt a
leonid [27]

Answer: Each shirt costs $1.25, and each hat costs $2.5.

Step-by-step explanation:

Let x= Cost per T-shirt, y = Cost per Hat.

As per given,

3x+3y=11.25        (i)

4x+2y=10             (ii)

Multiply 4 to equation (i)

12x+12y=45          (iii)

12x+6y= 30             (iv)

Eliminate (iv) from (iii), we get

6y= 15

⇒ y = 2.5

Put value of y in (i)

3x+3(2.5)=11.25

⇒3x+7.5=11.25

⇒3x= 3.75

⇒x= 1.25

Hence, each shirt costs $1.25, and each hat costs $2.5.

8 0
2 years ago
6.<br> Simplify the expression.<br> (-3)-4
Leto [7]

Answer:

-7

Step-by-step explanation:

  1. Re-write: -3 - 4
  2. -3 - 4 = -7

I hope this helps!

8 0
3 years ago
Read 2 more answers
Other questions:
  • Order the following numbers from least to greatest 0.4, 0.8, 1.2, and 1.6
    12·1 answer
  • Which polynomials are listed with their correct additive inverse? Check all that apply
    13·2 answers
  • A drilling machine can drill 12 holes in 6 minutes. If the machine drills holes at a constant speed, it can drill ______ holes i
    15·2 answers
  • The top of the cylindrical can shown below has a diameter of 7 centimeters (cm).
    5·1 answer
  • 4. Which of the following equations represent
    10·1 answer
  • The equation of a line is y=mx+ 4. What is the value of m if the line passes through point (−3, 7)?
    7·2 answers
  • The sum of two numbers is 51 and the difference is 13. what are the numbers
    14·2 answers
  • 50 × {9 − [(35 − 8) ÷ (1 + 2)]} =
    11·2 answers
  • FREE BRAIN!! TO THE FIRST PERSON
    10·2 answers
  • -4-(-8) divided by 4
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!