CHEMISTRY HIGH SCHOOL

Number of protons in an atom's nucleus?: _________

Answers

Answer 1
Answer:

Answer:

The number of protons in the nucleus of an atom is its atomic number, which is unique to each element.

Explanation:
Answer 2
Answer:

Answer:

It's the same as the atomic number e.g. Oxygen has the atomic number 8 so it has 8 protons in the nucleus.  

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1. How did Dmitri Mendeleev deal with elements that had not yet been discovered?A. He left blanks for them in his periodic table, as he predicted they would be discovered. B. He gave them names and properties and placed them in the table. C. He created them in his laboratory and placed them in the table. D. He ignored them, placing them in the table and shifting others when they were discovered. 2. Which of the following elements have properties similar to those of astatine (At)? A. F, Br, I B. Ar, S, P C. F, Ar, Ne D. Na, Mg, Al 3.What is true of the ionic size of the elements in a group as one moves from top to bottom in that group? A. Ionic size stays the same within the group. B. Ionic size does not vary in any predictable way within the group. C. Ionic size decreases from top to bottom within the group. D. Ionic size increases from top to bottom within the group.

Which is a characteristic of a weak electrolyte?

Answers

Answer:

They are feebly dissociated when dissolved in a solvent.

Explanation:

The electrolyte is a substance which dissociate into cations and anions when dissolved in a solvent.

The strong electrolyte is almost 100% dissociated.

The following are the characteristics of weak electrolyte.

a) they are weakly dissociated

b) they have low degree of dissociation (alph)

c) they have low value of dissociation constant (less than 0.001, generally).

d) they dissociate incompletely and there is dissociation increases with increase in dilution.
Electrolytes are substances which, when dissolved in water, break up into cations (plus-charged ions) and anions (minus-charged ions). We say they ionize. Strong electrolytes ionize completely (100%), whileweak electrolytes ionize only partially (usually on the order of 1–10%).

What is the affect of increasing the water's mass?how does it reflect it's temperature?

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I assume what you're asking about is, how does the temperature changes when we increase water's mass, according the formula for heat ? 
Well the formula is : Q=m\cdot c\cdot \Delta t (where Q is heat, m is mass, c is specific heat and \Delta t is change in temperature. So according this formula, increasing mass will increase the substance's heat, but won't effect it's temperature since they are not related. Unless,  if you want to keep the substance's heat constant, in that case when you increase it's mass you will have to decrease the temperature

The muscles in the stomach aid in digestion by __________.a. secreting bile
b. churning, or mixing, food
c. opening and closing the stomach
d. absorbing nutrients

Answers

The muscles in the stomach aid in digestion by churning, or mixing, food. Hence, option C is the correct answer.

What is digestion?

Digestion is the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive.

The stomach is a muscular sac that lies between theesophagus and the small intestine in the upper abdomen.

The stomach is not the only part of your digestive system that absorbs food but rather is a part of the digestive system and important for churning food into a consistency that is easier to digest for the rest of your intestines.

Hence, option C is the correct answer.

Learn more about digestion here:

brainly.com/question/2272856

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Churning or mixing food.

The stomach is a muscular sac that lies between theesophagus and thesmall intestine in the upper abdomen. The stomach is not the only part of your digestive system that absorbs food but rather is a part of the digestive system and important for churning food into a consistency that is easier to digest for the rest of your intestines.

A solution is considered neutral if its pH is _________ 7.a. equal to
b. less than
c. greater than

Answers

When the solution has a ph equal to 7

Answer:

a, equal to

Explanation:

If you have earned income, which of the following retirement devices must you contribute to, by law? A. IRA
B. Pension plan
C. Social security (FICA)
D. Vesting plan

Answers

C. SOCIAL SECURITY (FICA) PENNFOSTERS

Which hand is negatively charged? Ο Α. OB. Oc. OD. ​

Answers

Answer:

it would be OA that is negatively charged

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