CHEMISTRY MIDDLE SCHOOL

Really strong acids and bases are found at the​

Answers

Answer 1
Answer:

Ends....................?

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Mrs. Jacobson is pushing a fridge to the right with a force of 100 N. The force pushing itto the left is 15 N. What is the net (leftover) force on the fridge?
85 N to the right
85 N to the left
115 N to the right
115 N to the left

Answers

Answer:

A

Explanation:

Let's illustrate this; see the attachment.

We see that Mrs. Jacobson is pushing to the right with a force of 100 N and there is another opposite force pushing with a force of 15 N. Since these are in opposite directions, we can say that the force opposite to Mrs. Jacobson is pushing the fridge -15 N to the right (instead of 15 N to the left).

The net force would then be:

100 N + (-15 N) = 85 N to the right

The answer is A.

Answer:

85 N to the right

Explanation:

Convention: rightwards positive

Force applied by Mrs. Jacobson:

+100

Force applied by the fridge:

-15

Net force

+100 - 15

+85

QUICKEST GET BRAINLIEST AND 8 POINTS Which atomic model describes the atom as a nucleus surrounded by electrons that may travel as waves in the electron cloud?
Dalton's model
Thomson's model
Rutherford's model
Current model

Answers

Hello there.

Which atomic model describes the atom as a nucleus surrounded by electrons that may travel as waves in the electron cloud?


Rutherford's model.

Answer:

Which atomic model describes the atom as a nucleus surrounded by electrons that may travel as waves in the electron cloud?

Explanation:

hope this helps

How can friction be helpful when riding a bicycle and how can it be harmful

Answers

Friction can be beneficial because it helps stop a bicycle. It could be harmful when their is too much friction because it can burn the wheel. 

Students are able to introduce a sample of gas into a chamber with a moveable wall, allowing them to change the size of the portion of the chamber occupied by the gas. When the volume of the gas is reduced, what change in property would be the most reasonable to expect? a.)the temperature will decrease
b.)the pressure will decrease c.) the pressure will increase d.) the density will decrease

Answers

Final answer:

The pressure will increase. The correct option is (C).

Explanation:

The most reasonable change in property to expect when the volume of the gas is reduced is the pressure will increase.

This relationship between pressure and volume is described by Boyle's law, which states that when the volume of a gas decreases at constant temperature, the pressure of the gas increases.

This is because reducing the volume of the chamber decreases the space available for the gas particles to move, leading to more frequent collisions with the walls and an increase in pressure.

Therefore, as the volume of the gas is reduced in the chamber, the pressure will increase.

Learn more about pressure and volume relationship here:

brainly.com/question/31735835

#SPJ2

Answer:b

Explanation:

if your doing it on stemscopes

Which of the following is an example of a double replacement reaction? (a)3Fe + 2O2 Fe3O4
(b) BaCl2 + K2CO3 BaCO3 + 2KCl
(c) NiCO3 NiO + CO2
(d) Cl2 + 2NaBr 2NaCl + Br2

Answers

Answer: The correct answer is Option b.

Explanation:

Double displacement reactions are defined as the reactions in which exchange of ions takes place.

AB+CD\rightarrow CB+AD

For the given options:

Option a:3Fe+2O_2\rightarrow Fe_3O_4

This is an example of synthesis reaction.

Option b:BaCl_2+K_2CO_3\rightarrow BaCO_3+2KCl

This is an example of double displacement reaction.

Option c:NiCO_3\rightarrow NiO+CO_2

This is an example of decomposition reaction.

Option d:Cl_2+2NaBr\rightarrow 2NaCl+Br_2

This is an example of single displacement reaction.

From the above information, the correct answer is Option b.
b) is an example of a Double Displacement Reaction:

Ba  Cl2 + K2 CO3  ---> Ba  CO3 + 2K   Cl 
A    B       C   D             A    D           B   C

When Kay added 30 g of hydrochloric acid (HCl) to 65 g of Zn, bubbles appeared and a white precipitate, zinc chloride (ZnCl2) was produced. She found that the mass of the zinc chloride was 93 g. Since the Law of Conservation of Matter stated that matter can't be created or destroyed, she was puzzled about the difference in mass. What is the best explanation for the missing 2 g?A) 2 g of zinc disappeared.
B) 2 g of hydrogen gas were produced.
C) Kay didn't correctly mass the precipitate.
D) Kay didn't collect all of the precipitate.

Answers

Answer: B) 2 g of hydrogen gas were produced.

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

Zn(s)+2HCl(aq)\rightarrow ZnCl_2(s)+H_2(g)

Given: mass of reactants = mass of zinc + mass of  hydrochloric acid  = 65 g + 30 g = 95 g

Mass of products = Mass of zinc chloride + mass of hydrogen

As we know , mass of reactants = mass  of products

Mass of zinc chloride + mass of hydrogen  = 95 g

Given : Mass of zinc chloride = 93 g

93 g + mass of hydrogen  = 95 g

mass of hydrogen  = 95 g - 93 g = 2 g

Thus 2 g of hydrogen gas were produced.

Answer:

B) 2 g of hydrogen gas were produced.

Explanation:

Metals and acids react to form a salt and hydrogen gas, so this is the most likely explanation.
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