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3 years ago

The core of an atom contains protons and __________.

2 answers:

8 0

The core of Atom contains protons and neutrons. In chemistry, Proton is subatomic particles that carry a positive charge (+) while neutrons carry a negative charge (-). Neutrons and Protons are both called as Nucleons in which may be bind together to form atomic nuclei. The atomic mass unit of protons and neutrons is also called as nucleons. Atomic mass number or nucleon number is the number referred to the mass number of protons and neutrons found in the nucleus.

slega [8]3 years ago

6 0

The core of the atom contains a nucleus. That nucleus is made up of protons and neutrons.

Protons are made up two up quarks and a down quark. Up quarks have a charge of +2/3 and down quarks have a charge of -1/3.

+2/3 + 2/3 -1/3 = +4/3 - 1/3 = +3/3 = +1. This means that protons have a positive charge.

Neutrons are made up of two down quarks and an up quark.

-1/3 - 1/3 + 2/3 = -2/3 + 2/3 = 0. This means that neutrons have no charge, or a neutral charge.

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Evaluate (714 mm )/(37 s ) to three significant figures and express answer in si units using an appropriate prefix.

romanna [79]

The SI base units for length is meter (m) and for time is seconds (s).

The given ratio is $\frac{714 mm}{37 s}$

$\frac{714 mm}{37 s} = 19.297 mm/s \simeq 19.3 mm/s$

Converting mm/s to m/s as:

Since, 1 mm/s = 0.001 m/s

So, $19.3 mm/s = 0.0193 m/s$

Since, zeroes to the left side of the non-zero number are not significant hence, the evaluation of $\frac{714 mm}{37 s}$ to three significant figures and answer in SI units is $0.0193 m/s$ .

5 0

4 years ago

When 80.0 mL of a 0.812 M barium chloride solution is combined with 40 mL of a 1.52 M potassium sulfate solution, 10.8 g of bari

BabaBlast [244]

Answer:

76.1%

Explanation:

The reaction that takes place is:

BaCl₂ + K₂SO₄ → BaSO₄ + 2KCl

First we determine how many moles of each reactant were added:

BaCl₂ ⇒ 80 mL * 0.812 M = 64.96 mmol BaCl₂

K₂SO₄ ⇒ 40 mL * 1.52 M = 60.8 mmol K₂SO₄

Thus K₂SO₄ is the limiting reactant.

Using the moles of the limiting reactant we calculate how many moles of BaSO₄ would have been produced if the % yield was 100%:

60.8 mmol K₂SO₄ * $\frac{1mmolBaSO_4}{1mmolK_2SO_4}$ = 60.8 mmol BaSO₄

Then we convert that theoretical amount into grams, using the molar mass of BaSO₄:

60.8 mmol BaSO₄ * 233.38 mg/mmol = 14189.504 mg BaSO₄

14189.504 mg BaSO₄ / 1000 = 14.2 g BaSO₄

Finally we calculate the % yield:

% yield = 10.8 g / 14.2 g * 100 %

% yield = 76.1%

7 0

3 years ago

Which of the following is a FALSE statement?

Allisa [31]

Answer:

warm water is denser than cold water

Explanation:

7 0

3 years ago

Why does a pendulum need chemical energy

Mama L [17]

To move it needs a form of energy and in this case its chemical

6 0

4 years ago

Why are significant figures rules for calculations more important in science than in math class?

inysia [295]

Answer:

The importance of significant figures

As stated before, it is important within the science fields that you are not more precise or accurate than the least accurate or precise number. In science, it is generally agreed upon that the last number digit in any figure is filled with uncertainty.

Explanation:

4 0

3 years ago