Chemistry High School

HELP PLEASE lol, I just need a couple answers but I can't find this one anywhere, pic of question down below. :)

Answers

Answer 1

Answer:

It's b

Explanation:

Related Questions

Kernels of corn are heated and become popcorn. Why is this a chemical change?

Answers

Answer:

When popcorn is popped, liquid inside the kernel is changed to steam. Pressure from the steam builds up inside the kernel. When the pressure reached a critical stage the kernel pops turning itself inside out. This is a physical change.

Explanation:

Because it’s not a physical change

PLEASE HELP WITH THESE THREE (30 POINTS)
1) How is the number of neutrons in the nucleus of an atom calculated?
A. Add the number of elections- and protons+ together
B. Subtract the number of elections- from protons+
C. Subtract the number of protons+ from the atomic mass number
D. Add the atomic mass number to the number of elections-

2) Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same group on the periodic table. Why? *
A. They have the same size.
B. They react with each other.
C. They have similar properties.
D. They have the same number of protons

3) Which of the following elements would be a transition metal?
A. Ca
B. Au
C. Rb
D. Fr

Answers

1.B
2. C
3. A

i had the test with the same exact questions

Question 2 (1 point)
Given the following UNBALANCED equation,
Ca + HCl → CaCl2 + H2
what are the correct coefficients?
а
b
2,1,2,1
3,2,1,1
1,2,1,1
с
d
1,1,1,2
e
2,2,2,1

Answers

the correct coefficients are as follows (1,2,1,1)

a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm

Answers

Answer:

90yrs

Explanation:

Half life is the time taken for half of an original radioactive material to decay by half.

For the sample;

Half - life = 45yrs

Original amount = 600cpm

Start Number of atoms

0yrs 600cpm

First half life

45yrs 300cpm

Second half life

90yrs 150cpm

Temperature and kinetic energy have a relationship.

Answers

Answer:

[tex]\boxed {\boxed {\sf Temperature=Average \ kinetic \ energy}}[/tex]

Explanation:

Temperature is also known as the average kinetic energy in a substance.

If there is an absence of heat in a substance, the particles move slower and the kinetic energy decreases. The temperature will be lower, because there is less kinetic energy.

If heat is present or applied, the particles move more, so kinetic energy increases. The temperature will be higher, since there is more kinetic energy.

So, the relationship is: temperature is the measure of average kinetic energy.

Answer:

DIRECT

Explanation:

20 PTS!!! Jack said that unprocessed oil is a mixture of many organic compounds. Jane said that unprocessed oil needs to be processed so that individual compound can be isolated. Who made the correct statement and why?

1. Jack is correct, unprocessed oil is a mixture of many organic compounds. Jane is not correct, they do not need to be processed to be used.
2. Jack is incorrect, unprocessed oil is not a mixture of many organic compounds. Jane is correct, unprocessed oil needs to be processed to be used.
3. Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.
4. Neither Jack nor Jane are correct. Unprocessed oil, petroleum, is not a mixture of organic compounds and it does not need to be isolated or separated to be used.

Answers

Answer:

Explanation:

i am thinking 3 and 2 but i am gonna say it is 2

98.654321%

Answer:

Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.

Explanation:

Tin-126 has a half life of 100,000 years. How many years does it take to
reduce 100 g of Tin-126 to 12.5 g?
100,000 years
200,000 years
50,000 years
300,000 years

Answers

Answer:

300,000 years

Explanation:

100g=0 years

50g=100,00 years

25g=200,00 years

12.5g=300,000 years

300’000 yes I think she is correct

Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a . Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a .

Answers

Answer:

1. suspencion

2.colloid

Explanation:

Answer:

Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.

Which example is a body fossil?

shrimp burrow

dinosaur bone

dinosaur footprint

an ornithopod track

Answers

It’s a Dinosaur bone

Answer: B. dinosaur bone

Explanation: Took the test hope this helps! :)

plz help me and fast

Answers

Answer:1.atoms give one or more electrons with each other to form the bond

2. Each atom is left with a complete outer shell

3. A covalent bond forms between two

nonmetals

Explanation:

QUESTION 8: When would acceleration increase most? *
2 points
Rolling along a flat plane
Rolling down a steep hill
Braking to a stop
Rolling up a gently sloping hill

Answers

Answer:

Rolling down a steep hill

Explanation:

Can gravity be considered a force?
you will need an
1. claim,
2. evidence,
3. reasoning

what variables affect gravity?
you will need an,
1. claim
2. evidence.
3.reasoning

please help, thank you

Answers

Hey man your a rockstar get your game let’s play

4.85 x 10^-4 tons to cups

1.10 x 10^5 mg to cups

4.85 x 10^-4 tons to cups
please answer i have a project lol

Answers

Answer:

2.08753919851 cups

0.464942810185139 cups

2.08753919851 cups

Explanation:

i looked it up

3. Define isobar 75 points

Answers

Answer:

meteorology A line drawn on a map or chart connecting places of equal or constant pressure.

nuclear physics Either of two nuclides of different elements having the same mass number.

thermodynamics A set of points or conditions at constant pressure.

Answer:

a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.

Explanation:

Calculate the mass of fe(no3)3 that is measured to prepare 500.0 mL of a 0.175mol/L solution.

Answers

Answer:

21.3g

Explanation:

The formula of the compound is;

Fe(NO₃)₃

Given:

volume = 500mL = 0.5L

concentration = 0.175mol/L

Unknown:

Mass of Fe(NO₃)₃ measured = ?

Solution:

To solve this problem, find the number of moles first;

Number of moles of Fe(NO₃)₃ = concentration x volume

So;

Number of moles = 0.175 x 0.5 = 0.088mol

Now to find the mass;

Mass = number of moles x molar mass

Molar mass of Fe(NO₃)₃ = 55.8 + 3[14 + 3(16)]

Molar mass of Fe(NO₃)₃ = 55.8 + 3(62) = 241.8g/mol

Mass = 0.088mol x 241.8g/mol = 21.3g

Chemistry, biology and geography are the branch of natural science.
Select one:
True
False

Answers

Answer:

the answer is (a)true.

Answer (s) true.

Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.

Which orbital can be modeled by a "peanut" shape?

Answers

Answer:

d - orbital

Explanation:

The d-orbital can modelled by a peanut shape.

A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.

The s-orbital has a spherical shape. p - orbital is dumb-bell shapedd - orbital is a double dumbellf - orbital has a complex shape.

Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.

Which of these items found on a food label IS NOT a food?
Calories
Sugar
Proteins
Total fats

Answers

Answer:

the first one Calories

Is oxygen radioactive yes or no?

Answers

Answer:

ima go with no.....

Explanation:

Answer:

Stable isotopes are variants of atoms that differ in mass but do not decay over time, that is, they are not radioactive. The element oxygen (O) is found in three naturally occurring stable isotopes. So oxygen is not radioactive.

Explanation:

What type of change is rotting of fruits?

Answers

Answer:

Chemical

Explanation:

The rotting of fruit is a chemical reaction. This is because when fruit spoils, an enzymatic reaction occurs. Because an enzymatic reaction causes molecules to change when rotting, rotting is a chemical reaction.

well,It is a chemical change because once an apple rots, it cannot go back to its original form as a new, clean, and fresh apple. and that is a chemical change. making it be different on a chemical level.

Answer:

chemical change

Explanation:

the reason for a fruit to rot is the enzyme reactions in it we can take that as a solid reason and on the other hand if it is a physical change we can reverse the change that means we should be able to take a rotten fruit and make it to its original position so that we can have it. but we can never do that so we can prove that rotting of fruits is a chemical change.

hope this helps

Other Questions

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Part AIn How a Cat Played Robinson Crusoe, what inference can be made about the cat?She has difficulty living on the island without her family.She is intimidated by animals that are larger than she is.She is an excellent hunter.She is afraid to find shelter.Question 2Part BWhich evidence from the text best supports the inference in Part A?With a frantic flapping of his great wings the owl checked himself and drew back into the air.And in any case, the cat would have been afraid to go near it again.After that the marsh owls realized that it was best not to interfere with the black-striped animal with the quick spring and the clutching claws.With its wide spread of wing and its great round face with hooked beak and wild, staring eyes, it appeared very threatening. Pleaseee Helpppp!! Will give 30 points!!List five symptoms for each of the following common mental health problems that young people can experience.Depression1.2.3.4.5.Anorexia Nervosa1.2.3.4.5.Bulimia Nervosa1.2.3.4.5.Binge Eating Disorder1.2.3.4.5. Find the next number in the sequence.25, 36, 49, 64, ... Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a . Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesnt seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a . Describe how you could use the emulsion test to show the presence of oil in a sample of fish What evidence from the experiment shows that conduction occurred? Colonial soldiers won the Siege of Boston, even though theywere poorly trained compared to the British.ran out of ammunition fighting in Boston.had fewer soldiers in the siege than the British.were forced to retreat to Bunker Hill. Fill in the blank:1. A calorie is a unit of____2. Cells use the energy stored in chemical bonds of foods to produce compounds that directlypower the cell's activities, such as_____3. The equation that summarizes cellular respiration, using chemical formulas, is____4. If cellular respiration took place in just one step, most of the____ would be lost inthe form of light and____5. Cellular respiration begins with a pathway called______which takes place in the_____the cell.6. The equation that summarizes photosynthesis, using chemical formulas, is________and electron7. Cellular respiration continues in the_____of the cell with the______transport chain8. 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These voyages of discovery began in the eleventh century.Which of the following sentence paraphrases this excerpt correctly?A) Explorers made these difficult voyages for three main reasons: religion, wealth, and competition.B) These treacherous voyages of discovery began in the eleventh century where explorers searched for religion, wealth, and competition.C) In the eleventh century, explorers embarked on difficult voyages in search of religion, wealth, and competition.D) Religion, wealth, and competition are three examples of that explorers searched for. Number 17 PLEASE HELP 15 points if u right dont just take the points please or i will report you if 1.5kg block is pulled across a horizontal surface that has a coefficient of kintic friction of 0.60. if a block is pulled by a 12n force, what is the net force acting on the block Erik remembered that hisscience teacher had told him that an explosion in space could not really be heard. Whyis this so?