Chemistry Middle School

which ones are right

Which Ones Are Right

Answers

Answer 1
I think the last one
Answer 2
It's C D and F

hope this helps!

Related Questions

In guinea pigs, black fur is the dominant trait. If a white guinea pig mates with a guinea pig that is heterozygous for its black fur, which combination of offspring best represents the likely outcome from the cross?

A.
19 black fur, 1 white fur

B.
1 black fur, 20 white fur

C.
16 black fur, 4 white fur

D.
11 black fur, 9 white fur

Answers

The answer is C, since the black pig is heterozygous, it makes the majority black due to its dominant trait, but about 1 in 5 will be white

In a __________________ reaction, elements are not changed, just rearranged. Small amounts of energy take place.
a. Endothermic
b. Exothermic
c. Nuclear
d. Chemical

Answers

D. Chemical.
In a chemical reaction, elements are not changed, just rearranged. Small amounts of energy take place.

Match the vocabulary word to the definition. Question 1 options:
not easily changed?

A. an attraction between two or more atoms resulting in the formation of different chemical substances?

B. A chemical bond that involves sharing a pair of electrons between atoms in a molecule?

C. electrons in the outermost shell?

D. Formed when one or more electrons are transferred from one atom to another?

1. stable 2. chemical bonding 3. valence electrons 4. ionic bond 5. covalent bond

Answers

Answer:

a

Explanation:

A. Is chemical bonding

B. Is covalent bonding

C. Is valence electrons

D. Is ionic bonding

:)

Mrs. Hernandez brought her pet bird to school one day to find out what her students understood about forces. As the bird rested on a perch, Mrs. Hernandez asked her students to describe any forces acting on the bird. This is what some of her students said:
Bob: The only force acting on the bird is gravity.



Chelle: The only force acting on the bird is air pressure.



Fred: There are no forces acting on the bird because the perch stops any forces from acting on it.



Omar: There are many forces acting on the bird. The bird is held in place by the force of the branch.



Katrina: The force of gravity pulls down on the bird while the branch pushes up to support the bird.





Which student do you most agree with?

Explain your thinking. What reasoning did you use to decide what forces were acting on the bird? (WILL GIVE BRAINLIEST!!!)

Answers

if it’s not katrina, it’s bob. katrina’s is right because gravity is keeping the bird on the perch, but the perch is also holding the bird off of the ground.

this is my third time asking this,,, HELPPPPPP PLZZZz i'll mark brainliest! Infrared (IR) and ultraviolet (UV) light. But above 29°C, the coating on the glass undergoes a chemical change, causing it to block IR light. What happens to the IR light?

Answers

Answer:it would not cause any effect because its blocking it. Basically u could say that what would happen is that no effect was happening cuz of the blocking.

Explanation:

If you compare a long wavelength with a short wavelength, which one should have a higher frequency? Why?

Answers

A short wavelength! A long wavelength typically will have a sound drawn out so the waves will be shorter! To fit sound in a small frequency (wave shaped things) will be higher!
A short wavelength has higher frequency

Which of the following is an example of chemical energy?

a hot metal pan

an apple

turning on the TV

a roller coaster rolling down
HELP PLZ

Answers

Answer:

turning the tv

Explanation:

turning on the tv i'm pretty sure

Which of the following would most likely form an ionic bond?

A) Br and Cl

B) O and Cl

C) H and Cl

D) Na and Cl

Answers

it’s D because Na and Cl form ionic bond
D. Na is in the left side of the periodic and Cl is on the right. A and B are both covalently bonded

Which of these is not considered a pure substance?
An atom
A mixture
An element
A compound

Answers

Answer:

A mixture is not a pure substance.

A compound because it is mixed with more then one thing which means it’s not pure

I NEED HELP ASAP!!!
A sample of ice undergoes a physical change by being melted in a beaker. The ice cube had a mass of 30 grams. What will be the mass of the liquid water? How did you determine this?

Answers

Answer:

it would still be 30 grams.

Explanation:

it would still be 30 grams because you are not adding any more water to the beaker and you are not taking any of the melted water away

Is there a relationship between cohesion and volume?

Answers

Cohesion is the attraction of water molecules to stick to each other, technically there would be a relation to cohesion and volume because the more the water droplets come together the more volume there is. But, volume is how much space a substance occupies so the actual definition of the two words is different.

PLEASE HELPP

A student fills four containers with 20 ml of water and places them in four different locations.
One is placed in a sunny window, one is placed underneath a heat lamp, one is placed on a
student desk, and another is placed in a dark cabinet. The student plans to collect evaporation
data over a period of one week. Which prediction will best match the actual results?

Answers

Answer:

a heat lamp

Explanation:

Answer:

The one under the heat lamp is most effective

Explanation:

The heat is making the water warm and will soon evaporate

The bobsled is an event in the winter Olympics. In this event, each sled and its riders speed down an icy track. Which factor(s) affect how much kinetic energy the sled and its team have when the sled crosses the finish line?
A mass only
B speed and time
C speed and mass
D speed, mass, and time

Answers

Answer:

Speed and Mass

The factor affecting how much kinetic energy the sled and its team have when the sled crosses the finish line is speed and mass. The correct option is C.

What is kinetic energy?

Kinetic energy refers to the energy that an artifact or particle has as a result of its motion.

When work, which transfers the heat, is performed on an object by trying to apply a resultant force, the object accelerates and gains kinetic energy.

Kinetic energy is indeed the energy of a moving body, so it is the energy of all objects moving.

It is one of the two major types of energy, the other being potential energy, which is the energy that is stored within objects at rest.

The amount of kinetic energy a moving object has is determined by two factors: mass and speed.

Thus, the correct option is C.

For more details regarding kinetic energy, visit:

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PLS HELP
Fill in the word that completes each sentence.

In the mitochondrion, small molecules combine with
to produce
and carbon dioxide.

This process releases a large amount of
.

Answers

i believe it’s hydrogen and HCo2
I agree with the answer above mine

1. Which of these statements best describes the Earth’s crust?
A. It includes the continents but not the ocean floor.
B. It is a layer of molten rock that moves in circular patterns.
C. It is a system of large masses called tectonic plates that slowly move together or apart.
D. It is a layer of solid rock that remains the same throughout time.

Answers

Answer:

D) It is a layer of solid rock that remains the same throughout time.

Explanation:

I think it is, i might be wrong ..

PLEASE HELP!!!!!!!!!!!!!!!!!!!!!! DUE TOMORROW 40 POINTS!!!!!!!!!!!!!!!!!!
Elements in the same period are similar in that
same number of valence electrons of same number of energy shells

Answers

Answer: I believe this is the answer: The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

Good luck on assignment! :)

Answer: The elements in each group have the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons. They are the electrons involved in chemical bonds with other elements. Every element in the first column (group one) has one electron in its outer shell.

Explanation: :)    

Which option correctly identifies the pure substance or substances? a. diamond b. salt

A. a
B. a and b
C. b and c
D. all of them

Answers

I think the correct answers are A and B

Please help me out with this stuff please

Answers

Answer:

You have to do some of these yourself we cant do all the pages. You have to make sure to extend your knowledge :)

Explanation:

When Magnesium loses electrons to Oxygen and they form an Ionic bond.
Synthesis
Combustion
Decomposition
Redox

Answers

Answer:

Redox

Explanation:

Answer it should be redox

Where does energy for all living things come from FIRST

Answers

Answer:

The Sun is the major source of energy for organisms and the ecosystems.

Explanation:

Help me pleaseeee!! 10 points

Answers

Answer:

C: malleability

Explanation:

Think of something being malleable as also being moldable

Answer:

*Malleability*

Explanation:

Write a summary of some key ideas about chemical reactions.
Please!
I have to pass science to be able to get my nails done professionally!!!
I WILL MARK BRAINLIEST!!!!

Answers

chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Answer:

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Reactants are the starting materials, while products are the end result of the reaction. All chemical reactions are accompanied by a change in entropy.

In general, chemical reactions can be classified as either redox reactions or non-redox reactions. In redox reactions, there is a transfer of electrons between reactants. In non-redox reactions, there is no electron transfer. All exothermic reactions are redox reactions, while endothermic reactions may be either redox or non-redox.

Explanation:

Hope this helps!

What would happen if a cell membrane let too much water into a cell?

Answers

Answer:

Animal Cell

When water moves into an animal cell (e.g. a red blood cell), the cell membrane stretches and the cell gets bigger. If this continues, the cell membrane will burst – this is called lysis.

Plant Cell

When too much water moves out of a plant cell the cell contents shrink. This pulls the cell membrane away from the cell wall. A plasmolyzed cell is unlikely to survive.

When water moves into a plant cell, the vacuole gets bigger, pushing the cell membrane against the cell wall. ... The pressure created by the cell wall stops too much water entering and prevents cell lysis. If plants do not receive enough water the cells cannot remain turgid and the plant wilts.

scary storys anyone ?

Answers

Answer:

Me i love scary stories

Explanation:

Anyways can u give u give me brainlist (or however u spell it)

Worksheet: Balancing Equations
I. Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3


2. C3H8 + O2 CO2 + H2O


3. P4 + O2 P2O3




4. KNO3 KNO2 + O2


5. O2 + CS2 CO2 + SO2


6. KClO3 KCl + O2


7. N2 + H2 NH3


8. NaF + Br2 NaBr + F2


9. Al + HCl H +AlCl3


10. WO3 + H2 W + H2O

Answers

Answer:

1. Chemical Equation 2. Reactants 3. Products 4. Coefficients 5. Balance 6. Conservation 7. Equal 8. Created 9. Destroyed 10. Coefficients 11. Subscripts

Explanation:

A balanced equation obeys the law of conservation of mass. The mass of the reactants and products are equal on both sides of the equation.

What is a balanced equation?

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. The numbers which are used to balance the chemical equation are called the coefficients.

The coefficients are the numbers which are added in front of the formulas. According to law of conservation of mass, the mass can neither be created nor be destroyed. It can be transformed from one form to another.

In other words, the mass and charge are balanced on both sides of the reaction.

The balanced equation for the reaction is:

4Al (s) + 3O₂ (g) → 2Al₂O₃ (s)

Here the number of 'Al' and 'O' atoms are balanced.

To know more about balanced equation, visit;

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When an apple falls from a tree, when does gravity act on the apple?

Answers

Gravitation Potential energy is converted into the Kinetic Energy, when it just reaches the ground. Some amount of energy is wasted in sound and heat energy when it strikes the ground. When the apple falls from the tree, it has some gravitational potential energy due to its height.
it has potential energy once it drops from the tree and a gravitational pull

Why do you think the Na+ ion is smaller than a neutral Na atom? Why do you think the Cl - ion is larger than a neutral Cl atom?

Answers

Answer:

Na+ ion is smaller than a neutral Na atom in the ion there was one more proton which will attract electron bring it closer to the center making the atomic radius smaller. Therefore making a Na+ ion is smaller than a neutral Na atom Explanation:

yes

Answer please 10 points

Answers

Answer:

water

Explanation:

Answer:

Water

Explanation:

Most of the Earth is covered with water, so water is the substance.(H20)

have more points because i dont care

Answers

Answer:

????

Explanation:

Answer:KK thanks

Explanation:fun fact:greeks loved gays like anyone who was gay recieved so much help from the government that being gay in ancient greece was so common

Quickly answer please I’ll give you 25 points

Which event would most likely lead to a thunderstorm?
A. A warm, dry air mass moving over a cold air mass
B. A cold, dry air mass moving over a warm air mass
C. A cold, moist air mass moving over a warm air mass
D. A warm, moist air mass moving over a cold air mass

Answers

Answer:

A. A warm, dry air mass moving over a cold air mass

Explanation:

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