All categories

2 years ago

I need help on question 1 and 2

Chemistry

2 answers:

Step2247 [10]2 years ago

8 0

Answer:semi metals

Explanation:

Phantasy [73]2 years ago

4 0

Answer:

1.positive, negative

2. Noble gases

Explanation:

difference in electrical charge means positive and negative

In the periodic table the last column is noble gases

You might be interested in

A 1.2 kg sample of Th-228 has a half-life of 1.9 years. How many grams of Th is left after 13.3 years?

Bumek [7]

.009375 kg or 9.375 grams will remain

7 0

3 years ago

What kind of chemical reaction does the chemical equation sodium + chlorine → sodium chloride represent?

Vinil7 [7]

D. Synthesis cause A + B --> AB Equation: 2Na + Cl2 --> 2NaCl

7 0

3 years ago

Read 2 more answers

An acid with molar mass 84.48 g/mol is titrated with 0.650 M KOH. What volume of KOH solution is needed to titrate 1.70 grams of

RSB [31]

Answer:

$V=0.0310L=3.10mL$

Explanation:

Hello.

In this case, since the acid is monoprotic and the KOH has one hydroxyl ion only, we can see that at the equivalence point the moles of both of them are the same:

$n_{acid}=n_{KOH}$

Thus, since we are given 1.70 g of the acid, we compute the moles of acid that were titrated:

$n_{acid}=1.70g*\frac{1mol}{84.48g}=0.0201mol$

Which equal the moles of KOH. In such a way, since the molarity is defined as moles over liters (M=n/V), the liters are moles over molarity (V=n/M), thus, the resulting volume is:

$V=\frac{0.0201mol}{0.650mol/L}\\\\V=0.0310L=3.10mL$

Best regards!

7 0

2 years ago

777 Joules of energy are applied to 25.0 grams of each of the following materials, which

4vir4ik [10]

Answer:

I think copper

Explanation:

Material IACS % Conductivity

Silver 105

Copper 100

Gold 70

Aluminum 61

Nickel 22

Zinc 27

Brass 28

Iron 17

Tin 15

Phosphor Bronze 15

Lead 7

Nickel Aluminum Bronze 7

Steel 3 to 15

the table might help- your indian brother

3 0

2 years ago

Determine how many atoms of pure silver will be created when 19.83 x 1023 atoms of copper are used in the following reaction:

Lubov Fominskaja [6]

Answer:

$\boxed{3.966 \times 10^{24}\text{ atoms of Ag}}$

Explanation:

(a) Balanced equation

Cu + 2AgNO₃ ⟶ Cu(NO₃)₂+ 2Ag

(b) Calculation

You want to convert atoms of Cu to atoms of Ag.

The atomic ratio is ratio is 2 atoms Ag:1 atom Cu

$\text{Atoms of Ag} = 19.83 \times 10^{23}\text{atoms Cu} \times \dfrac{\text{2 atoms Ag}}{\text{1 atom Cu}}\\\\= 3.966 \times 10^{24}\text{ atoms of Ag}\\\\\text{The reaction will produce }\boxed{\mathbf{3.966 \times 10^{24}}\textbf{ atoms of Ag}}$

4 0

2 years ago

Read 2 more answers