Chemistry High School

help please
........​

Help Please........

Answers

Answer 1

I am pretty sure it is Vitamin A... but I could be wrong. Sorry if it is wrong.

Related Questions

Savvas Realize. Investigation 8 Experiment 1

Answers

Answer:

–1065.25 KJ of energy.

Explanation:

From the question given above, the following data were obtained:

4FeO + O₂ —> 2Fe₂O₃  ΔH = –560.66 kJ

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Finally, we shall determine the amount of heat energy released when 3.8 moles of Fe₂O₃ are produced. This can be obtained as follow:

From the balanced equation above,

The formation of 2 moles of Fe₂O₃ released –560.66 kJ of energy.

Therefore, the formation of 3.8 moles of Fe₂O₃ will release

= (3.8 × –560.66)/2 = –1065.25 KJ of energy.

Thus, –1065.25 KJ of energy is released from the reaction.

What is the type of structure indicated below?
a- ionic structure
b-resonance structure
c- molecular structure
d-electron dot structure

Answers

Answer:

Electron dot structure

Explanation:

This is because electron dot structure is the structure that shows or indicate valence electrons of an atom and dots

is use around the element symbols . The number of dots shows the total number of valence electrons that are present in the atom of the molecules.

Which of the following can be used as lubricant

Answers

Answer:

Explanation:

B is the ans

pls mark BRAINLIEST

Letter b is the answer b can be used as a lubricant

2. How many moles are in 2.8 Liters of CO2 gas?

Answers

Answer:

0.125 moles

Explanation:

2.8 litres is equivalent to 2.8dm³

At STP,

1 mole = 22.4 dm³

x mole = 2.8 dm³

Cross multiply

22.4x = 2.8

Divide both sides by 22.4

x = 2.8/22.4

x = 0.125

Can anyone solve this chemical reaction?

Answers

Answer:

1) BaCl2 + Na2O = BaO + 2NaCl

2) C4H8 + 6O2 = 4CO2 + 4H2O

3) MgCO3 + 2K = K2CO3 + Mg

4) N2 + 3F2 = 2NF3

Guys help me





Please

Answers

Answer:

8.38×10raise to power 23

Explanation:

mass of sugar=density ×volume

=. 1.59g/ml×25ml=39.75

no. of miles= given mass/ molar mass

= 39.75/342.3g / mole

1 mole of sugar =C12 H22 O11

contains

12× 6.023 × 10 ∆23=72.28× 10∆ 23 ×6.023×10²³

= 8.38× 10²³

Fill in the blank,
The law of conservation of mass
says substances can neither be
nor

Answers

Answer:

created or destroyed

Explanation:

The law of conservation of mass tells us that during a chemical reaction, matter is neither created or destroyed; it can change from one form to another but there will be no gain or loss of mass.

give me a example of physical
pls

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Answer:

An example of physical is plant life growing in the ground. An example of physical is someone confined to a wheelchair because of disabilities. Of, or produced by the forces of physics.

Explanation:

What do all living organisms in an area make up?

Answers

B Is the answer! Hope this helps

If 115grams of a substance reacts with 84grams of another substance, what will be the mass of the products after the reaction?

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Isn’t it 115+84 so 199

Does anybody know how to do this if so please help !

Answers

Answer:

add x to 7 and divide by 3

Explanation:

easier formula

A drug company is testing the effects of a new drug designed to prevent hair loss. Of the 2,000 people in the trial, 1,700 people receive the drug and the other 30 people receive a sugar pill. What is the purpose of the group receiving the sugar pill? A. The group is being used as the control group B. The group is being used as the dependent variable C. The group is being used as the independent variable D. The group is being used as the manipulated variable

Answers

Answer:

A

Explanation:

The correct answer would be that the group being given the sugar pill is being used as the control group.

In a typical experimental study, there are two groups of subjects:

1. The treatment or the experimental group

2. The control group

The treatment group receives the treatment variable while the control group does not receive or is given a placebo. Thus, the control group act as the reference group for comparison basis. Any difference in the observation between the two groups would be attributed to the treatment variable.

The correct option is, therefore, A.

Your opinion on chocolate

What is your opinion on chocolate, any kind like white chocolate dark, etc. also what do you think is the bad side of chocolate?

Answers

Answer:

Milk Chocolate

Explanation:

Some chocolates contain lots of sugar, but for Dark chocolate its healthy

Answer:

Milk chocolate the bad side of chocolate is getting fat

Explanation:

have u ever tried shreks snickers before?

which of the following statements is true?

A. Displacement and distance traveled are always the same
B. Displacement and distance traveled are never the same.
C. Distance traveled is the direction of the displacement vector.
D. Displacement and distance traveled are the same if the direction does not change. ​

Answers

Answer:

D. Displacement and distance traveled are the same if the direction does not change.

Answer:

D

Explanation:

if a person in a single direction, then that person may travel certain distance and if the direction is not changed then its displecemengt remains same sa that person travelled distance.

Pls help me with this problem

Answers

Answer:

2 and 5 would be my answers

Explanation:

What are the two major causes of genetic disorders in humans?

Answers

Some genetic disorders are caused by mutations in the DNA while other disorders are caused by changes in the overall structure or number of chromosomes.

Answer:

genetic mutation or the environmental exposures

whether carboxylic acids are electrolytes​

Answers

Answer:

??

Explanation:

What is the correct formula for Diphosphorus Hexoxide?

Answers

Answer:

Hey mate......

Explanation:

This is ur answer....

P₄O₁₀

Hope it helps!

mark me brainliest pls.......

Follow me! :)

describe each of the three states of matter (solid, liquid, gas)​

Answers

Explanation:

In a solid particles are firmly together and are stuck in a regular pattern

in a liquid particles still touch but arent in a fixed pattern

in a gas particles move quickly in all directions

Below are is a before and after particle diagram that shows the process of
condensation. Choose the statement below that best describes how the
particles changed in their arrangement during this process.
Attempt d
2 Minute
Before: Gas 100 C
After: Liquid 30 C

Answers

Answer:

It must first melt to become a liquid and then evaporate to become a gas

Explanation:

helllp meee pls . ....... ..... . . . . .
. . . . . . . . . .. . . . . ... .. . . . . ....... . . .. . . .. . . . . . . . . ... .. . . . ....

Answers

The answer is A “ mutations”

Which of the following processes occurs with a decreaseentropy of the system

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Explanation: Entropy decreases when the number of moles of gas decreases during a reaction. In the case of the correct answer, the number of moles of gas decreases from two to one. When a substance goes from a solid to a gas (sublimation) or from a liquid to a gas (evaporation), entropy increases.

1. A block of plastic occupies a volume of 25.0 mL and weighs 20.5 g. What is its density? Circle or highlight
the correct answer. (5 pts)
a. 512 g/mL
c. 0.37 g/mL
b. 1.62 g/mL
d. 0.82 g/mL

Answers

I think answer should be d. Please give me brainlest let me know if it’s correct or not okay thanks bye


1. If a 250 kg rock is sitting on the ledge of Ls cliff 295 meters high, then what is the
potential energy of the rock?

Answers

Answer:

Explanation:

P.E=M*G*H

P.E=250*10*295

P.E=737,500J

Diamond is extremely hard and does not conduct electricity.
Which statement explains these properties?.

Answers

Answer:

C. It has no delocalised electrons and each carbon atom forms four covalent bonds with other carbon atoms.

Explanation:

Diamond is composed solely by carbon atoms. As the difference of electronegativity between atoms is 0, diamond is a fully covalent compound.The lack of electrical conductivity stems from a lack of available electrons, this means that there are no delocalised electrons.

The information in the first point discards options A and D, while the second point discards option B. Thus the answer is option C.

What happens to the limiting reactant during the course of the chemical reaction?

Answers

Answer: The limiting reactant is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

Explanation:

^

1. Cancer is a disease in which cells

a. grow and divide uncontrollably. b. die before they can mature.

c. stop producing DNA. d. die during mitosis.

____ 2. Which of these traits is controlled by a gene with multiple alleles?

a. straight hairline b. smile dimples

c. widow’s peak d. blood type

____ 3. Which of these is an example of the benefits of genetic engineering?

a. cross-breeding to create disease-resistant crops

b. creating human insulin to treat people with diabetes

c. analyzing karyotypes and pedigree charts

d. growing a new plant from a cutting

____ 4. A carrier is a person who has

a. one recessive and one dominant allele for a trait.

b. two recessive alleles for a trait.

c. two dominant alleles for a trait.

d. more than two alleles for a trait.

____ 5. Sex-linked genes are genes on

a. the X chromosome only. b. the Y chromosome only.

c. the X and Y chromosomes. d. all 23 pairs of chromosomes.

______ 6. What is the chromosome theory of inheritance?

a. Chromosomes are carried from parents to offspring on hybrids.

b. Genes are carried from parents to offspring on chromosomes.

c. Hybrid pairs of chromosomes combine to form offspring.

d. Codominant genes combine to form new hybrids.

____ 7. How can a mutation affecting skin be harmful to an animal?

a. It can make the animal more visible to its prey or predators.

b. It can cause disease in the animal.

c. It can make the animal resistant to certain diseases.

d. It can make the animal resistant to drugs

______ 8. What happens during meiosis?

a. Two sex cells combine.

b. Chromosome pairs separate and are distributed into new sex cells.

c. Each sex cell copies itself to form four new chromosomes.

d. Chromosome pairs remain together when new sex cells are formed.

Answers

Answer:

1. a

2. a.

3. b.

4. a.

5. c.

6. b.

7. a.

8. c.

Explanation:

Which shows substances placed in order from strongest to weakest attractive forces at room temperature?
es )
A)
1. Br (s) 2. Br (9) 3 Br (1)
B)
1. Br (s) 2. Br (1) 3 Br (9)
1. Br (9) 2. Br (1) 3 Br (s)
D)
1. Br (aq) 2. Br (1) 3 Br (9)
Dhusical Dror

Answers

Explanation:

es la b es ciertos que es el resultado

What element is found in water?

1. Carbohydrate

2. Carbon

3. oxygen

Answers

Explanation:

3. the element is oxygen

oxygen is in water! ;)

Which statement is correct?
A. Physical changes produce new substances; chemical changes do not.
B. Chemical changes produce new substances; physical changes do not.
C. Both physical changes and chemical changes produce new substances.
D. Neither physical changes nor chemical changes produce new substances.

Answers

Answer:

B. Chemical changes produce new substances; physical changes do not.

Explanation:

Physical changes only alter appearances, while chemical changes are interactions that create new chemical formulas.

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